JP2000279527A - Indwelling needle assembly and valve element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an indwelling needle assembly provided with a valve element causing no liquid leakage due to deterioration with time and having high liquid tightness after inversion. SOLUTION: This indwelling needle assembly body12 has a hollow outer needle 2, an outer needle hub 3 which is provided in a basic end part of the outer needle 2 and has a lumen part 34 communicating with the inside of the outer needle 2, an inner needle 4 inserted into the outer needle 2, an inner needle hub 5 provided in a basic end part of the inner needle 4, and a valve element 7 set in the lumen part 34 of the outer needle hub 3 to seal the lumen part 34. The valve element 7 is constituted by an elastic material and has a deformation part 73 capable of inverting. An outer peripheral shape of a cross section of the deformation part 73 in a condition before inversion is non-circular (for example, square), outer faces before inversion adhere closely and mutually when inverted, and an inner side of the deformation part 73 is blocked to obtain liquid tightness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indwelling needle assembly and a valve for puncturing and indwelling a blood vessel, for example, during infusion.

[0002]

2. Description of the Related Art When infusion is performed on a patient, an indwelling needle connected to an infusion line is punctured into a blood vessel of the patient and is indwelled. Such an indwelling needle includes a hollow outer needle, an outer needle hub to which the proximal end of the outer needle is fixed, an inner needle which is inserted into the outer needle and has a sharp needle tip at the distal end, and an inner needle. And an inner needle hub fixed to the proximal end.

When puncturing the indwelling needle into a patient's blood vessel, the inner needle is inserted into the outer needle, and the puncture operation is performed with the needle tip of the inner needle protruding from the tip of the outer needle.

[0004] When the needle tip of the inner needle reaches the inside of the blood vessel, the blood flowing from the opening of the needle tip flows through the lumen of the inner needle and flows into the transparent inner needle hub (flashback). Thereby, it can be confirmed that the inner needle has secured the blood vessel.

After confirming the flashback, the inner needle and the outer needle are advanced slightly, and the tip of the outer needle is inserted into the blood vessel. Next, while grasping the outer needle by hand, the inner needle is pulled out from the outer needle, and the connector of the infusion line is connected to the outer needle hub.

Here, the operation from withdrawing the inner needle from the outer needle to connecting the connector of the infusion line to the outer needle hub must be performed quickly. If this operation is delayed, blood that has flowed back in the outer needle due to blood pressure leaks from the proximal end opening of the outer needle hub, and contaminates the surroundings.

Therefore, in order to solve this problem, an elastic plug (elastic plug) through which the inner needle can penetrate is provided inside the outer needle hub.
And an elastic plug assembly in which leakage of blood is prevented by the liquid tightness of the elastic plug (Japanese Patent Laid-Open No. 8-2).
No. 29133).

However, this elastic plug assembly has the following disadvantages. In other words, the state in which the inner needle is pierced by the elastic stopper is maintained until use, but the portion of the elastic stopper that has been in intimate contact with the inner needle surface deteriorates with time and loses its elastic force. After removing the needle, the hole in which the inner needle was located may not be sufficiently closed, and blood may leak from this hole.

For this reason, as the material of the elastic plug, it is necessary to select and use a material that does not deteriorate over time. However, there is a limit in preventing the deterioration over time by selecting the material. Is also very expensive and leads to increased costs.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide an indwelling needle assembly and a valve body which are free from liquid leakage due to aging and have high liquid tightness after the valve body is inverted. .

[0011]

This and other objects are achieved by the present invention which is defined below as (1) to (15).

(1) A hollow outer needle, an outer needle hub provided at a base end of the outer needle and having a lumen communicating with the inside of the outer needle, and an inner needle inserted into the outer needle An inner needle hub provided at a base end of the inner needle; and a reversible valve which is installed in the inner cavity of the outer needle hub so as to seal the inner cavity, and is made of an elastic material. An indwelling needle assembly having a body,
The indwelling needle assembly, wherein the valve body has a non-circular outer peripheral shape in a cross section of the valve body before the inversion, and the outer surfaces before the inversion are in close contact with each other when the valve body is inverted.

(2) The indwelling needle assembly according to the above (1), wherein the outer peripheral shape of the cross section of the valve body before inversion is a polygon.

(3) The indwelling needle assembly according to the above (1), wherein the outer peripheral shape of the cross section of the valve body before inversion is a shape combining a circular arc and a straight line.

(4) Any of the above (1) to (3), wherein the inner peripheral shape of the cross section of the valve body before inversion is the same or similar to the cross sectional shape of the outer peripheral surface of the inner needle. An indwelling needle assembly according to any one of the claims.

(5) The valve element has a thick portion having a larger thickness and a thin portion having a smaller thickness than the thick portion along the circumferential direction. The indwelling needle assembly according to any one of the above.

(6) The indwelling needle assembly according to any one of the above (1) to (5), wherein the whole or a part of the valve body is made of a material that blocks liquid but allows gas to pass therethrough. .

(7) The indwelling needle assembly according to any one of (1) to (6), wherein the valve body is inverted by friction when the inner needle inserted in the valve body is withdrawn.

(8) The indwelling needle assembly according to any one of (1) to (7), wherein the inner needle is provided with a reversal assisting means for assisting the reversal of the valve body.

(9) A reversible valve body having a hole through which a tubular body or a rod-shaped body can be inserted and made of an elastic material, wherein the outer peripheral shape of the cross section of the valve body before inversion is provided. A valve body having a non-circular shape, wherein when inverted, outer surfaces before inversion come into close contact with each other.

(10) The valve body according to the above (9), wherein the outer peripheral shape of the cross section before the inversion is a polygon.

(11) The valve element according to the above (9), wherein the outer peripheral shape of the cross section before the inversion is a shape obtained by combining an arc and a straight line.

(12) The above (9) to (11) wherein the inner peripheral shape of the cross section before the reversal is substantially circular.
A valve body according to any one of the above.

(13) Any one of the above (9) to (12), which has a thick portion having a larger thickness and a thin portion having a smaller thickness than the thick portion along the circumferential direction. Valve body.

(14) The valve element according to any one of the above (9) to (13), wherein at least a part of the valve element is made of a material that blocks a liquid but allows a gas to pass therethrough.

(15) The above-mentioned (9) to (14) wherein the valve body is inverted by friction when removing a tube or a rod inserted therein, or by a reversal assisting means provided on the tube or the rod. ).

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An indwelling needle assembly and a valve body according to the present invention will be described below in detail with reference to the preferred embodiments shown in the accompanying drawings.

FIGS. 1, 2 and 3 are longitudinal sectional views each showing an embodiment of the indwelling needle assembly of the present invention. FIG. 1 shows a state in which an inner needle and an outer needle are assembled. , FIG. 2
Shows a state in which the inner needle is removed from the outer needle, and FIG. 3 shows a state in which the infusion device is connected to the outer needle hub. FIG.
5 is a perspective view and a longitudinal sectional view showing the configuration near the distal end portion of the indwelling needle assembly shown in FIG. 1 and the like in a state where the inner needle and the outer needle are assembled. FIGS. FIG. 8 is a longitudinal sectional view showing the structure of the valve body of the invention, and FIG.
9 is a sectional view taken along line BB in FIG. 7. In the following description, the right side in FIGS. 1 to 6 is referred to as a “proximal end”, and the left side is referred to as a “distal end”.

As shown in FIGS. 1 to 5, an indwelling needle assembly 1 according to the present invention comprises an outer needle 2 which is an indwelling needle, an outer needle hub 3 provided at a base end of the outer needle 2, and an outer needle hub 3. An inner needle 4 used by being inserted into the needle 2, and an inner needle hub 5 provided at a base end of the inner needle 4.
And a valve element (sealing member) 7 installed in the outer needle hub 3. Hereinafter, the configuration of each unit will be described.

An outer needle hub 3, which will be described in detail later, is fixed to the proximal end of the outer needle 2 in a liquid-tight manner. The outer needle hub 3 is preferably made of a transparent (colorless and transparent), colored transparent or translucent resin, and the visibility of the lumen 34 is secured.

As shown in FIG. 5, the distal end of the outer needle 2 has a tapered shape whose outer diameter gradually decreases toward the distal end in order to puncture the living body easily and with minimal invasion. A reduced diameter portion 21 having a reduced inner diameter is formed on the distal end side. The inner diameter of the reduced diameter portion 21 is set to be substantially equal to or slightly smaller than the outer diameter of the inner needle 4 described later, and the inner needle 4 is inserted into the inner cavity of the outer needle 2 and the needle tip 41 is With the outer needle 2 protruding from the distal end opening 23, the reduced diameter portion 2
1 is configured such that the inner peripheral surface thereof is in close contact with the outer peripheral surface of the inner needle 4. As shown in FIG. 1, this state is obtained in a state where the inner needle hub 5 is fitted to the outer needle hub 3, that is, in a state where the outer needle 2 and the inner needle 4 are assembled (in a united state). Therefore, this state is hereinafter referred to as “assembled state”.

The inner diameter of the outer needle 2 at the base end side of the reduced diameter portion 21 is larger than the outer diameter of the inner needle 4, and the inner peripheral surface of the outer needle 2 and the inner needle 4 A predetermined gap 22 is formed between the outer peripheral surface and the outer peripheral surface. This gap 22 becomes a blood flow path.

The constituent material of the outer needle 2 is not particularly limited. For example, various soft resins such as ethylene-tetrafluoroethylene copolymer (ETFE), polyurethane, and polyether nylon resin are preferable.

It is preferable that all or part of the outer needle 2 has internal visibility. Further, an X-ray contrast agent such as barium sulfate or barium carbonate may be blended in the constituent material of the outer needle 2 to provide a contrast function.

The outer needle hub 3 is a substantially cylindrical member, and an outer needle fixing portion 3 for fixing the outer needle 2 in a liquid-tight manner is provided on the distal end side.
1. At its proximal end, there is provided a fitting portion 33 to be fitted with the inner needle hub 5 or the infusion infusion device 9 described later. An intermediate portion 32 is formed between the outer needle fixing portion 31 and the fitting portion 33 to form an inner cavity 34 sealed by the valve 7.

The method of fixing the outer needle 2 in the outer needle fixing portion 31 is not particularly limited, and may be, for example, fusion (heat fusion, high frequency fusion, or the like), adhesion with an adhesive, or a caulking member (holding member) not shown. For example, swaging and fixing, or a combination thereof may be used.

The fitting portion 33 has a tapered shape (tapered tube) whose inner diameter and outer diameter gradually increase toward the base end. Thereby, the inner needle hub 5 and the infusion infusion device 9 can be easily and reliably fitted. In particular, the infusion injector 9 can be connected in a liquid-tight manner. The fitting portion 33
May have a stepped shape.

The intermediate portion 32 has a cylindrical shape whose inner diameter is substantially constant. Inside the intermediate portion 32, a lumen portion 34 communicating with the lumen of the outer needle 2, that is, the gap 22 in an assembled state is formed.

An annular projection 6 is formed on the side of the intermediate portion 32 (upper side in FIGS. 1 and 2). This annular protrusion 6
Constitutes an exhaust passage for discharging gas in the lumen 34, and a ventilation filter 61 is attached to an end of the exhaust passage. The ventilation filter 61 is fixed by a ring-shaped cap 62.

The ventilation filter 61 has a property of transmitting gas but blocking liquid. Ventilation filter 6
Specific examples of 1 include, for example, various sintered porous bodies, hydrophobic nonwoven fabrics, and other porous bodies. In this case, as the sintered porous body, a material obtained by sintering a material containing a polymer material (powder) such as polyethylene and a hydrophilic (water-soluble, water-swellable) polymer is preferable. When this sintered porous body is used, ventilation is blocked by contact with a liquid (blood), so that invasion of air from the outside can be prevented.

The root-side end 63 (the end opposite to the ventilation filter 61) of the annular projection 6 communicates with the lumen 34 in a state where the inside is expanded. Thereby, the outer needle hub 3
Irrespective of the posture (even when the outer needle hub 3 is inclined with respect to the horizontal), the air bubbles in the inner cavity 34 can be raised and effectively discharged.

The exhaust path is not limited to the one formed by the annular projection 6 as shown in the figure, but may be a side hole formed through the wall of the outer needle hub 3, for example. In this case, it is preferable that the ventilation filter 61 is provided so as to cover the side hole.

The inner needle 4 is made of, for example, a metal material such as stainless steel, aluminum or an aluminum alloy, titanium or a titanium alloy, and has a sharp needle tip 41 formed at its tip. The shape of the needle tip 41 is not particularly limited. In this embodiment, the needle tip 41 has a shape having a blade surface 42 inclined at a predetermined angle with respect to the axis of the inner needle 4.

As shown in FIG. 1, the length of the inner needle 4 is such that at least the needle tip 41 protrudes from the distal end opening 23 of the outer needle 2 when assembled.

As shown in FIGS. 4 and 5, a groove 46 extending along the longitudinal direction of the inner needle 4 is preferably formed on the outer peripheral surface of the distal end of the inner needle 4. . The groove 46 constitutes a blood flow path, and a portion (formation region) of the groove 46 where the inner needle 4 is formed in the longitudinal direction is a portion which is in close contact with at least the outer needle 2 in an assembled state. That is, in the assembled state, the groove 46 is located at a portion facing the reduced diameter portion 21 of the outer needle 2, and includes an axial region of the reduced diameter portion 21. Specifically, it is formed from the vicinity of the base end (root portion) of the blade surface 42 along the longitudinal direction of the inner needle 4 by a length including the axial region of the reduced diameter portion 21.

By providing such a groove 46 in the inner needle 4, a blood flow path is formed inside the reduced diameter portion 21 in the assembled state, and the distal end opening 2 of the outer needle 2 is formed through the groove 46.
3 communicates with the gap 22 to form a continuous blood flow path.

When the indwelling needle is punctured into a living body, the puncture is normally performed with the blade surface 42 facing upward. Therefore, the groove 46 is formed along the longitudinal direction of the inner needle 4 from near the base end (root portion) of the blade surface 42. The provision of the flashback blood allows the reduced diameter portion 21 (groove 4
There is an advantage that the state passing through (6) can be easily visually recognized.

Both edges 47 of the groove 46, that is, the groove 46
The vicinity of the boundary between the inner needle 4 and the outer peripheral surface is preferably rounded (so-called R-shaped). If the edge portion 47 is sharply sharpened, the inner surface of the outer needle 2 may be damaged when the inner needle 4 is inserted through the outer needle 2,
Such an inconvenience does not occur when the edge portion 47 is rounded.

The method of forming such a groove 46 is not particularly limited, and examples thereof include those formed by grinding, laser processing, etching, and the like. In this embodiment, the inner needle 4 is formed by plastic working. It is preferable that the inner needle 4 is formed by press working, in particular, by press working the inner needle 4. This is because a groove 46 having a rounded edge portion 47 and a groove having a complicated shape described later can be easily formed without performing secondary processing such as polishing or deburring.

When the groove 46 is formed mainly by press working, a projection 48 is formed on the inner side surface of the inner needle 4 at the portion where the groove 46 is formed, projecting into the inner cavity of the inner needle 4.
That is, the wall thickness of the inner needle 4 does not significantly decrease even in the portion where the groove 46 is present, and the wall thickness of the inner needle 4 is substantially constant over the entire circumference. Thus, it is possible to prevent the strength of the portion where the groove 46 is formed from decreasing.

The shape and size of the groove 46 are not particularly limited as long as they can cover the contact portion between the inner needle 4 and the outer needle 2, but in the case of the configuration shown, the maximum depth of the groove 46 is 0.
About 01 to 0.7 mm is preferable, and 0.05 to 0.45 mm
The length is more preferably, and the length is preferably about 1 to 30 mm, more preferably about 1 to 15 mm. The width of the groove 46 is preferably about 0.1 to 1.5 mm, and 0.2 to 0.7 mm.
About mm is more preferable.

The cross-sectional shape, maximum depth, width, etc. of the groove 46 may be the same or varied along the longitudinal direction of the inner needle 4. For example, the groove 46 may have a portion (particularly a proximal portion) whose maximum depth and / or width gradually decreases (or increases) in the proximal direction.

The groove 46 is not limited to a linear one as shown, but may be a curved one, a meandering one or a spiral one.

Further, a plurality of grooves 46 may be formed. In this case, the positions of the grooves 46 may be arranged in parallel to each other, arranged at a predetermined angle, Anything may be used. Further, one groove 46 may be branched into a plurality of grooves in the middle.

Further, such a groove 46 constitutes a blood flow path in an assembled state, but may have any structure instead of the groove 46 as long as it functions as a blood flow path. A concave portion or a rough surface such as a chamfer may be provided at the same position as the groove 46.

As shown in FIG. 1, at the base end of the inner needle 4,
The inner needle hub 5 is fixed in a liquid-tight manner. The inner space 51 of the inner needle hub 5 is in communication with the lumen of the inner needle 4. The inner needle hub 5 is preferably made of a transparent (colorless and transparent), colored transparent or translucent resin, and the visibility of the internal space 51 is ensured.

The distal end of the inner needle hub 5 has a shape whose outer diameter is reduced toward the distal end so that it can be fitted into the fitting portion 33 of the outer needle hub 3.

At the proximal end of the inner needle hub 5, a ventilation filter 52 similar to the ventilation filter 61 is mounted. The ventilation filter 52 is fixed by a ring-shaped cap 53.

The outer needle hub 3 and the inner needle hub 5 may be made of, for example, polyolefins such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyvinyl chloride, polyurethane, polystyrene, polymethyl methacrylate, and polycarbonate. , Polybutadiene, polyamide, polyethylene terephthalate, polyester such as polybutylene terephthalate, acrylic resin, ABS resin, ionomer, polyacetal,
Examples include polyphenylene sulfide and polyether ether ketone.

At the base end side of the intermediate portion 32 of the outer needle hub 3,
A reversible valve 7 that can seal the lumen 34 is provided. Hereinafter, the shape, structure, and the like of the valve body 7 will be described.

As shown in FIGS. 1, 2, and 6 to 9, the valve body 7 is made of an elastic material and has a disk-shaped flange 71 on the outer periphery. The valve element 7 is provided with the flange 7
The entire outer circumference of the outer needle hub 3 is formed by, for example, fusion, bonding, or the like.
It is installed and fixed by being fixed to the inner surface of the.

A deformable portion 73 that can be elastically deformed is formed on the inner side (front end side) of the flange portion 71 of the valve body 7.

The deformed portion 73 protrudes from the flange 71 toward the distal end in the assembled state. The deformed portion 73 has a shape that tapers toward its tip, and a hole 72 through which the inner needle 4 can be inserted is formed at the center thereof (see FIG. 6). As shown in FIGS. 1 and 6, when the inner needle 4 is inserted into the hole 72, the inner surface of the hole 72 is in close contact with the outer peripheral surface of the inner needle 4 due to the elasticity of the deformable portion 73.
Maintain liquid tightness.

The deformed portion 73 is a portion (reversed portion) where the front and back can be reversed. When the operation of pulling out the inner needle 4 in the proximal direction from the state in which the inner needle 4 is inserted through the hole 72 (the state shown in FIG. 6) and pulling out the inner needle 4 from the hole 72 is performed, the closely attached hole The deformed portion 73 is pulled in the same direction by the frictional force between the inner surface 74 of the inner needle 72 and the outer peripheral surface of the inner needle 4, and the distal end 77 of the deformed portion 73 penetrates into the hole 72 and sequentially moves in the proximal direction. 73 is reversed (the state shown in FIG. 7 is reached). The inverted deformed portion 73 protrudes toward the base end.

As described above, since the valve body 7 is automatically inverted when the inner needle 4 is pulled out, no special operation for inverting the valve body 7 is required, and the operation is easy. . Hereinafter, the shapes of the valve body 7 before and after inversion will be described.

<1A> Shape of Valve Body Before Inversion (Refer to FIG. 8) The shape of the inner surface 74 of the deformed portion 73 of the valve body 7 before the inversion (the inner circumferential shape of the cross section) is the shape of the outer surface of the inner needle 4. The same or similar shape as the cross-sectional shape, that is, as shown in FIG.
It is circular. Thereby, the adhesiveness to the outer peripheral surface of the inner needle 4 is high, and excellent liquid tightness can be secured.

Further, the deformed portion 73 of the valve body 7 before inversion is performed.
The cross-sectional shape (outer peripheral shape of the cross-section) of the outer surface (surfaces 1a to 8a) is non-circular. That is, as shown in FIG.
The outer peripheral shape of the cross section of the deformation portion 73 is a square.

The deformed portion 73 of the valve body 7 has a thick portion 75 having a large thickness and a thin portion 76 having a smaller thickness than the thick portion 75 along the circumferential direction. I have. That is, the thick portion 75 is formed near the four corners of the square, and the thin portion 7 is formed near the center of the four sides of the square.
6 are formed.

For convenience in explaining the shape of the valve body 7 after the reversal, the outer surface (outer peripheral surface) of the deformed portion 73 of the valve body 7 is divided into eight equal parts in the outer circumferential direction, and each of the surfaces is divided into surfaces (planes) 1a to 1a. 8a.

<2A> Shape of Valve Body After Inversion (See FIG. 9) When the valve body 7 is inverted, the inner surface 74 and the outer surface (surface 1a) before inversion are obtained.
8a) are reversed. That is, the outer surface 74 'of the deformed portion 73 after the valve body 7 is inverted is the inner surface 7' before the inversion.
FIG. 9 is an enlarged view of FIG.
As shown in FIG.

Further, the surfaces 1a to 8a constituting the outer surface (outer peripheral surface) of the deformed portion 73 before the inversion are respectively folded inward and adhere to each other. That is, after the reversal, the surface 1a and the surface 2a, the surface 3a and the surface 4a, the surface 5a and the surface 6a, and the surface 7
a and the surface 8a are in close contact with each other, and the inside of the deformed portion 73 is liquid-tightly closed (sealed). In other words, the four thick portions 75 including the respective corners are joined and crimped at their outer surfaces bent at right angles, and the inside of the deformed portion 73 is closed (sealed) in a liquid-tight manner.

In FIG. 9, the corresponding surfaces are separated from each other to make it easy to see the positional relationship between the surfaces 1a to 8a.
Although a gap (a cross-shaped gap as a whole) is formed between them, in practice, the corresponding surfaces are in close contact with each other, and this gap is not substantially formed.

As described above, the valve body 7 not only ensures liquid tightness before inversion, but also after inversion, the outer surfaces (surfaces 1a to 8a) before inversion adhere to each other and deform. The inside of the portion 73 is closed, and liquid tightness is ensured. That is, when the valve body 7 is in the assembled state (when the inner needle 4 is inserted into the hole 72), the lumen portion 34 is sealed in a liquid-tight manner to prevent blood from leaking out. Even after the inner needle 4 is pulled out, the inverted deformed portion 73 comes into close contact and is sealed in a liquid-tight manner, so that leakage of blood can be prevented. In addition, when necessary, such as at the time of infusion of an infusion, the hole 72 can be opened to release the sealing of the lumen 34.

Since the outer shape of the cross section of the deformed portion 73 before turning is non-circular (square in this embodiment), the deforming portion 73 is formed when the valve 7 is turned over. Since each part (particularly the thick part 75 and the thin part 76) is turned over with a certain direction, the reversing operation is performed regularly. Therefore, the reversal of the valve element 7 can be easily and reliably performed.

Further, between the thick portion 75 and the thin portion 76, the thin portion 76 has lower bending elasticity. Therefore, when the deformable portion 73 is pulled in the proximal direction by the frictional force between the inner surface 74 and the outer peripheral surface of the inner needle 4 with the operation of pulling the inner needle 4 in the proximal direction and extracting the inner needle 4 from the hole 72, first, The thin portion 76 that is easily deformed also enters the hole 72 and turns over, and subsequently, the thick portion 75 turns over. in this way,
In the valve body 7, the thickness difference is provided along the circumferential direction, so that the thin portion having a small bending elasticity, that is, the thin portion 76 is a trigger for inversion, and is pulled by the remaining portion of the deformed portion 73. Is inverted, it is possible to easily and reliably perform the inversion of the deformed portion 73. In particular, the inner surface 7
4, the deformed portion 73 of the valve body 7 can be easily and reliably reversed even when the pressure deterioration (frictional force) between the inner needle 4 and the outer peripheral surface of the inner needle 4 changes. In addition, such an operation | movement and an effect are hereafter called easy and certainty of inversion of the valve body 7.

As a constituent material of the valve body 7, especially the deformed portion 73, for example, natural rubber, isoprene rubber, silicone rubber, urethane rubber, styrene-butadiene rubber,
Elastic materials (or soft materials) such as various synthetic rubbers such as fluorine rubber and acrylic rubber, porous bodies of polytetrafluoroethylene, various thermoplastic elastomers such as polyamide and polyester, and porous bodies of polyurethane.

It is preferable that the material of the valve element 7 be relatively flexible. The flexibility of the elastic material can be represented by, for example, rubber hardness specified in JIS TYPE A. In the present invention, the rubber hardness of the material constituting at least the deformed portion 73 of the valve body 7 is preferably less than 95, and more preferably less than 65. Within such a range, it is possible to achieve both excellent liquid tightness before and after inversion and ease (reliability) of inversion.

It is preferable that all or a part of the valve element 7, in particular, in this embodiment, all or a part of the deformed portion 73 be made of a material that blocks a liquid but can transmit a gas.
Accordingly, even when the above-described exhaust path is not provided, the gas (bubbles and the like) in the lumen 34 can be exhausted through the valve body 7. Examples of the material having such characteristics include various porous bodies such as a polyurethane porous body and a polytetrafluoroethylene porous body. Further, such a porous body that has been subjected to a water-repellent treatment may be used.

In the present invention, since the deformed portion 73 of the valve body 7 is inverted, the liquid-tightness of the lumen 34 after the inner needle 4 has been removed is maintained. It is not necessary or necessary to consider the deterioration with the passage of time, and thus the range of choice of the constituent material of the valve element 7 is widened. Therefore, a material having excellent moldability, a material that is mass-produced, and an inexpensive material can be used, and the valve body 7 can be easily manufactured.

The shape of the hole 72 is not limited to a circular shape as in the illustrated embodiment, but may be, for example, a polygon such as an ellipse, an octagon, a hexagon, a pentagon, a quadrangle, a triangle, or a single character. It may be a slit.

As shown in FIG. 1, the inner needle 4 is located near the distal end side of the distal end 77 of the valve body 7 in the assembled state.
As an inversion assisting means for assisting the inversion of the valve element 7, a ring-shaped projection 8 is provided. The protrusion 8 is fixed to the outer peripheral surface of the inner needle 4 by, for example, bonding with an adhesive, clamping by caulking, or the like.

When the inner needle 4 is pulled out in the proximal direction, the protrusion 8 comes into contact with the distal end 77 of the deformed portion 73 and presses the distal end 77 in the proximal direction, so that the deformed portion 73 is easily inverted. Become.

The structure of the reversal assisting means is not limited to the protrusion 8 as shown, but may be a structure in which the outer peripheral surface of the inner needle 4 is roughened to increase the friction.

Further, such a reversal assisting means is provided as needed and may be omitted.

As shown in FIG. 3, the fitting portion 3 of the outer needle hub 3
3, an infusion infusion tool 9 can be fitted in a liquid-tight manner.
The infusion infusion tool 9 in this embodiment is a connector installed at the tip of an infusion line (infusion supply line).

The distal end portion 91 of the infusion device 9 has a reduced diameter, and has an outer diameter such that the hole 72 of the valve element 7 can be expanded and inserted into the deformed portion 73. Inside the tip 91,
An opening 92 is formed.

The proximal end 93 of the infusion device 9 is connected to a flexible tube 94 constituting an infusion line.

When the infusion device 9 is moved toward the distal end with respect to the outer needle hub 3 and fitted and connected to the fitting portion 33, the distal end of the infusion device 9 is turned into a deformed portion of the valve body 7. 73 is pressed in the direction of the distal end and is again inverted (returned to the original state), and the distal end portion 91 of the infusion device 9 pushes the hole 72 wide and is inserted into the hole 72. As a result, the sealing of the lumen portion 34 by the valve element 7 is released, the inside of the infusion device 9 communicates with the lumen portion 34, and the infusion device 9 allows the inner cavity portion 34 and the subsequent outer needle 2 to be connected. An infusion or the like can be supplied to the lumen.

The shape and structure of the infusion device 9 are not limited to those shown in the drawings. In particular, the distal end portion 91 is not limited to a tubular shape, but has a flow path through which liquid can pass through the valve element 7. Any structure may be used as long as it can be formed. The infusion injecting device connected to the outer needle hub 3 may be, for example, a syringe capable of injecting an infusion or a drug solution.

FIGS. 10 and 11 are cross-sectional views showing other embodiments of the valve body of the present invention. this house,
FIG. 10 shows a cross section of the deformed portion before the valve body 7 is inverted, and FIG. 11 shows a cross section of the deformed portion after the valve body 7 is inverted. Hereinafter, the shapes of the valve element 7 before and after inversion will be described with reference to these drawings.

<1B> Shape of Valve Body Before Inversion (Refer to FIG. 10) The shape of the inner surface 74 of the deformed portion 73 of the valve body 7 before the inversion (the inner circumferential shape of the cross section) is the shape of the outer surface of the inner needle 4. The shape is the same as or similar to the cross-sectional shape, that is, a circle as shown in FIG. Thereby, the adhesiveness to the outer peripheral surface of the inner needle 4 is high, and excellent liquid tightness can be secured.

Further, the deformed portion 73 of the valve body 7 before inversion is performed.
The cross-sectional shape (outer peripheral shape of the cross-section) of the outer surface (surfaces 1b to 8b) is non-circular. That is, as shown in FIG. 10, the outer peripheral shape of the cross section of the deformed portion 73 is a so-called candy shape, and a pair of opposed arcs (surfaces curved in an arc shape) 1b, 2b and these arcs 1b, 2b Arcs (surfaces curved in an arc shape) 3b, 4b, 5b, and 6b each having a length approximately half that of the arcs 1b and 2b.
And a straight line (plane) 7b connecting the ends of the arcs 3b and 4b.
And a straight line (plane) 8b connecting the ends of the arcs 5b and 6b.
It has a shape consisting of

The deformed portion 73 of the valve element 7 has a thick portion 750 having a large thickness and a thin portion 760 having a smaller thickness than the thick portion 750 along the circumferential direction. I have. That is, the thick portions 750 are respectively provided between the inner surface 74 and the straight line (plane) 7b and between the inner surface 74 and the straight line (plane) 8b.
Are formed, and thin portions 760 are formed between the inner surface 74 and the arc (curved surface) 1b and between the inner surface 74 and the arc (curved surface) 2b.

<2B> Shape of Valve Body After Inversion (See FIG. 11) When the valve body 7 is inverted, the inner surface 74 and the outer surface (surface 1b) before inversion are inverted.
8b) is reversed. That is, the outer surface 74 'of the deformed portion 73 after the valve body 7 is inverted is the inner surface 7' before the inversion.
4 is the one that has been turned upside down, and its cross-sectional shape is shown in FIG.
As shown in FIG.

Also, the surfaces 1b to 8b, which constituted the outer surface (outer peripheral surface) of the deformed portion 73 before the inversion, are each folded inward and adhere to each other. That is, after inversion, the surface 1b and the surfaces 3b and 5b, the surface 2b and the surfaces 4b and 6b,
The surface 7b and the surface 8b are in close contact with each other, and the inside of the deformed portion 73 is liquid-tightly closed (sealed). In other words, the two thick portions 750 are joined and crimped at their surfaces 7b, 8b,
The inside of the deformed portion 73 is closed (sealed) in a liquid-tight manner.

In FIG. 11, in order to make it easy to see the positional relationship between the surfaces 1b to 8b, the corresponding surfaces are separated from each other, and a gap is formed between them (a substantially H-shaped gap as a whole).
Is shown as being formed, but in practice,
The corresponding surfaces are in close contact with each other, and this gap is not substantially formed.

The operation and effect of the valve element 7 shown in FIGS. 10 and 11, particularly the easiness and certainty of the reversal of the valve element 7 described above, are the same as those described in the embodiments of FIGS. The same is true.

FIGS. 12 and 13 are cross-sectional views showing other embodiments of the valve body of the present invention. this house,
FIG. 12 shows a cross section of the deformed portion before the valve body 7 is inverted, and FIG. 13 shows a cross section of the deformed portion after the valve body 7 is inverted. Hereinafter, the shapes of the valve element 7 before and after inversion will be described with reference to these drawings.

<1C> Shape of Valve Body Before Inversion (See FIG. 12) The shape of the inner surface 78 of the deformed portion 73 of the valve body 7 before the inversion (the inner circumferential shape of the cross section) is as shown in FIG. It is a square. The valve body 4 is suitable for being used by inserting an inner needle 4 or other rod-like body having a square cross section, particularly a square. Thereby, the adhesion to the outer surface of the inner needle 4 and the rod-shaped body is high, and excellent liquid tightness can be secured.

Further, the deformed portion 73 of the valve body 7 before reversing
Has a non-circular cross-sectional shape (the outer peripheral shape of the cross-section) of the outer surface (surfaces 1c to 8c). That is, as shown in FIG. 12, the outer peripheral shape of the cross section of the deformed portion 73 is rectangular.
The outer surface of the deformed portion 73 is constituted by surfaces (planes) 1c to 8c.

The deformed portion 73 of the valve body 7 has a thick portion 755 having a large thickness and a thin portion 765 having a smaller thickness than the thick portion 755 along the circumferential direction. I have. That is, between the inner surface 78 and the surface 7c and between the inner surface 78 and the surface 8c.
c, a thick portion 755 is formed between the inner surface 78 and the inner surface 78.
And a surface 1c and between the inner surface 78 and the surface 2c.

<2C> Shape of Valve Body After Inversion (See FIG. 13) When the valve body 7 is inverted, the inner surface 78 and the outer surface (surface 1c) before the inversion are inverted.
8c) is reversed. That is, the outer surface 78 ′ of the deformed portion 73 after the reversal of the valve body 7 is
FIG. 8 is an enlarged view of the cross section of FIG.
As shown in FIG. 3, it is substantially square (or rectangular).

Also, the surfaces 1c to 8c, which constituted the outer surface (outer peripheral surface) of the deformed portion 73 before the inversion, are each folded inward and adhere to each other. That is, after inversion, the surface 1c and the surfaces 3c and 5c, the surface 2c and the surfaces 4c and 6c,
The surface 7c and the surface 8c are in close contact with each other, and the inside of the deformed portion 73 is liquid-tightly closed (sealed). In other words, the two thick portions 755 are joined and crimped between their surfaces 7c, 8c,
The inside of the deformed portion 73 is closed (sealed) in a liquid-tight manner.

In FIG. 13, in order to make it easy to see the positional relationship between the surfaces 1c to 8c, the corresponding surfaces are separated from each other, and a gap (a substantially H-shaped gap as a whole) is provided between them.
Is shown as being formed, but in practice,
The corresponding surfaces are in close contact with each other, and this gap is not substantially formed.

The operation and effect of the valve element 7 shown in FIGS. 12 and 13, particularly the easiness and certainty of the inversion of the valve element 7 described above, are the same as those described in the embodiments of FIGS. The same is true.

FIGS. 14 to 17 are a perspective view and a cross sectional view, respectively, showing another embodiment of the valve body of the present invention. 14 is a perspective view showing the shape of the valve body 7 before inversion, FIG. 15 is a perspective view showing the shape of the valve body 7 after inversion, and FIGS. 16 and 17 are FIGS.
FIG. 16 is a longitudinal sectional view of the valve body shown in FIGS. 4 and 15. Hereinafter, the shapes of the valve element 7 before and after inversion will be described with reference to these drawings.

<1D> The shape of the valve body before inversion (FIG. 14,
As shown in FIG. 14 and the like, as shown in FIG. 14 and the like, the entire shape of the deformed portion 73 of the valve element 7 is shaped like a piece of shogi. The outer surface of the deformed portion 73 has four outer peripheral surfaces 1d to 4d.
And two tip surfaces (top surfaces) 5d and 6d.

The shape (the inner circumferential shape of the cross section) of the inner surface 79 of the deformed portion 73 of the valve body 7 before the inversion is rectangular as shown by the dotted line in FIG.

Further, the deformed portion 73 of the valve body 7 before inversion is performed.
Cross-sectional shape of the outer peripheral surface 1d to 4d (the outer peripheral shape of the cross-section)
Is non-circular. That is, as shown in FIG. 14, the outer peripheral shape of the cross section of the deformed portion 73 is rectangular.

The deformed portion 73 of the valve element 7 has a thick portion 757 having a large thickness and a thin portion 767 having a smaller thickness than the thick portion 757 along the circumferential direction. . That is, the thin portions 76 are provided near the outer peripheral surfaces 1d and 3d, respectively.
7 are formed, and thick portions 757 are formed near the outer peripheral surfaces 2d and 4d, respectively.

<2D> The shape of the valve body after inversion (FIG. 15, FIG.
The valve element 7 is inverted at an inversion angle (a change in the angle with respect to the center line of the deformed portion 73) of, for example, about 90 °. When the valve body 7 is inverted, the inner surface 79 before the inversion and the outer peripheral surfaces 1d to 4d and the tip surfaces 5d and 6d are inverted. That is, the outer surface 79 ′ of the deformed portion 73 after the reversal of the valve body 7 is the one in which the inner surface 79 before the reversal is turned upside down, and its cross-sectional shape is
It is rectangular.

Further, the front end surfaces 5d and 6d, which constituted the outer surface of the deformed portion 73 before the inversion, are each folded inward and come into close contact with each other. That is, after the reversal, the distal end surface 5d and the distal end surface 6d are in close contact with each other, and the inside of the deformed portion 73 is closed (sealed) in a liquid-tight manner.

The operation and effect of the valve element 7 shown in FIGS. 14 to 17, particularly the easiness and certainty of the inversion of the valve element 7 described above, are the same as those described in the embodiment of FIGS. The same is true.

Although the valve element 7 of each of the above embodiments is shown as being made of one kind of elastic material, the present invention is not limited to this. It may be formed by combining two or more materials having different compositions or characteristics.

For example, the valve body 7 may be formed by joining or integrating two or more kinds of materials having different elasticity or flexibility (rubber hardness). In this case, the liquid-tightness of the valve element in the inverted state can be further improved by adopting a configuration in which the portion having more flexibility is brought into close contact with the valve element 7 when it is inverted. Further, the valve body 7 may be formed by joining or integrating two or more materials having different air permeability or two or more materials having different surface frictional resistances.

Next, how to use the indwelling needle assembly 1 (operation).
An example will be described.

[1] As shown in FIG. 1, the outer needle 2 and the inner needle 4 are assembled in advance. Such an indwelling needle assembly 1
In the assembled state, the inner surface 74 (78, 79) of the deformable portion 73 of the valve body 7 is in close contact with the outer peripheral surface of the inner needle 4, and the inner cavity 34 is liquid-tightly sealed. The needle tip 41 of the inner needle 4 protrudes from the distal end opening 23 of the outer needle 2, and the groove 46 is
Face to face.

It is preferable that this step has already been completed when the indwelling needle assembly 1 is used (when the packaging material surrounding the indwelling needle assembly 1 is opened).

[2] The assembled inner needle 4 and outer needle 2 are punctured into a blood vessel (vein or artery) of the patient. In particular,
This operation is preferably performed in a posture in which the annular projecting portion 6 faces vertically upward in order to efficiently exhaust the below-described lumen portion 34.

When the needle tip 41 of the inner needle 4 is punctured into a blood vessel,
The blood flows backward in the inner needle 4 in the proximal direction due to the internal pressure (blood pressure) of the blood vessel, is introduced into the inner space 51 of the inner needle hub 5, and the flashback is visually recognized by the inner needle hub 5 having visibility. Can be. This makes it possible to know that the needle tip 41 of the inner needle 4 has secured a blood vessel.

As blood is introduced into the internal space 51, the air existing in the internal space 51 passes through the ventilation filter 52 and is discharged to the outside of the inner needle hub 5. Therefore, it is possible to quickly and reliably confirm flashback caused by blood flowing into the internal space 51.

[3] When the inner needle 4 and the outer needle 2 are further advanced in the distal direction by a small distance, the distal end of the outer needle 2 is inserted into the blood vessel. Thereby, blood flows in from the tip opening 23,
After passing through the groove 46, it then flows proximally through the gap 22 and is introduced into the lumen 34 of the outer needle hub 3. The flashback can be visually recognized by the outer needle 2 and / or the outer needle hub 3 having visibility. This makes it possible to know that the distal end of the outer needle 2 has secured a blood vessel.

As the blood is introduced into the lumen 34, the air existing in the lumen 34 passes through the annular projection 6 (exhaust passage) and passes through the ventilation filter 61. hand,
It is discharged outside the outer needle hub 3. Further, when all or a part of the deformed portion 73 of the valve body 7 is made of a material that blocks liquid but allows gas to pass through, the air in the lumen 34 passes through the valve body 7. Is also discharged. As a result, the lumen 34 is quickly replaced with blood with little air remaining. Therefore, it is possible to promptly and properly confirm the securing of the blood vessel of the outer needle 2 and the inner cavity 3
The air remaining in 4 is not injected into the blood vessel via the outer needle 2 at the time of injection of an infusion described later, and the safety is high.

Even when the lumen 34 is filled with blood,
As described above, the lumen 34 is liquid-tightly sealed by the valve body 7, so that blood does not leak out beyond the valve body 7.

[4] Thereafter, if necessary, only the outer needle 2 is further advanced in the blood vessel, and is introduced to a predetermined indwelling position.

The outer needle 2 is held by one hand, the inner needle hub 5 is gripped by the other hand and pulled in the proximal direction, and the inner needle 4 is
Remove from This results in the state shown in FIG. As described above, the deformed portion 73 of the valve body 7 is also pulled in the proximal direction along with the extraction operation of the inner needle 4, and the deformed portion 73 is inverted.

When the deformed portion 73 is inverted, the front and back (the inner surface and the outer surface) are reversed. Due to the elasticity of the deformed portion 73, the surface constituting the outer surface of the deformed portion 73 before the inversion (outer peripheral surface, tip surface, etc.)
The close contact is made to close the inside of the deformed portion 73. Thereby, the valve body 7 after the deformed portion 73 is inverted also seals the lumen 34 in a liquid-tight manner, and prevents blood from leaking beyond the valve body 7. In particular, even if the elasticity in the vicinity of the inner surface 74 (78, 79) of the deformed portion 73 that has been in close contact with the inner needle 4 has decreased due to aging or the like as a result of being in an assembled state for a long time, it does not Since the opposite surfaces 1a to 8a are inwardly contracted, adhered, and closed, the liquid-tightness of the lumen 34 can be reliably ensured.

When the reversing assisting means such as the projection 8 is provided, the deformed portion 73 of the valve element 7 can be more reliably reversed by the above-described operation of the reversing assisting means.

All or a part of the deformed portion 73 of the valve body 7
In the case where the liquid is cut off but the gas is permeable, even if gas (bubble etc.) remains in the lumen 34, this gas is passed through the valve 7 to the valve 7 can be discharged to the proximal end side.

[5] As shown in FIG. 3, the infusion device (connector) 9 is fitted to the fitting portion 33 of the outer needle hub 3 and connected. Thus, the infusion line is connected to the outer needle hub 3.

With the connection of the infusion injector 9, the deformed portion 73 whose tip is inverted is pressed in the direction of the distal end, and is again inverted.
1 spreads out hole 72 and is inserted into hole 72. Thereby, the sealing of the lumen portion 34 by the valve body 7 is released, and the inside of the infusion device 9 and the lumen portion 34 communicate with each other.

[6] Infusion is supplied from the infusion line.
As shown by the arrow in FIG. 3, the infusion sent in the distal direction through the tube 94 flows inside the infusion injector 9, passes through the opening 92 of the distal end portion 91, and flows into the lumen 34. Through the inner cavity of the outer needle 2 and the distal end opening 23 of the outer needle 2
It is better injected into the patient's blood vessels.

Even if bubbles are mixed in the infusion, the bubbles rise when passing through the lumen 34, pass through the annular projection 6 (exhaust passage), and pass through the ventilation filter 6.
1 and is discharged to the outside. That is, the annular protrusion 6 has a deaeration function.

When all or a part of the deformed portion 73 of the valve body 7 is made of a material that blocks liquid but can transmit gas, bubbles in the lumen 34 are 7 is also discharged. Therefore, infusion of the infusion solution containing air bubbles into the blood vessel is effectively prevented, and the safety is high.

[7] When the infusion of the infusion solution into the patient is completed, the outer needle 2 is removed from the patient's blood vessel.

Although the indwelling needle assembly and the valve of the present invention have been described with reference to the illustrated embodiments, the present invention is not limited to these embodiments. The member can be replaced with an arbitrary member having the same function.

In the present invention, the shape of the valve body, in particular, the cross-sectional shape (shape before or after inversion) of the valve body is not limited to the illustrated one, and may be any shape.

The inner needle 4 is not limited to a hollow one having both ends opened as shown in the figure, but may be a part of the inner cavity (for example, a base end).
May be closed or solid.

Further, what is inserted into the valve body of the present invention is as follows.
Not limited to a needle tube such as the inner needle 4, but also, for example, a connector
Any tube, such as a sheath or a catheter, or a rod such as a wire, may be used.

[0140]

As described above, according to the present invention, there is no liquid leakage due to the deterioration of the valve element with the passage of time, and therefore, contamination of the surroundings due to leakage of blood or the like can be effectively prevented. In particular, it exhibits excellent liquid tightness not only in the state before inversion of the valve body (assembled state of the outer needle and the inner needle), but also in the state after inversion (the state in which the inner needle is removed from the outer needle). Leakage of blood or the like can be prevented.

Since the reversing operation of the valve body is performed regularly, the reversal can be performed easily and reliably. In particular, even if the pressing force between the inner surface of the valve body and the outer surface of the inner needle varies, or if the pressing force changes (decreases) due to deterioration of the valve body with time, the valve body can be easily and reliably inverted. Can be.

Further, when necessary, the sealing by the valve body is released, and the infusion of an infusion solution or the like can be performed easily, smoothly, and reliably.

When the reversal assisting means is provided, the valve body can be more reliably reversed.

When the whole or a part of the valve body is made of a material that blocks liquid but can transmit gas,
When the outer needle hub has an exhaust path, air bubbles can be prevented from being injected into blood vessels and the like by deaeration from the liquid, and the safety is high.

Further, with the indwelling needle assembly of the present invention, since it is possible to confirm the securing of the blood vessel of the inner needle and the outer needle, the puncturing operation of the indwelling needle into the blood vessel can be performed easily and accurately.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the indwelling needle assembly of the present invention (an assembled state of an inner needle and an outer needle).

FIG. 2 is a longitudinal sectional view showing an embodiment of the indwelling needle assembly of the present invention (in a state where an inner needle is removed from an outer needle).

FIG. 3 is a longitudinal sectional view showing an embodiment of the indwelling needle assembly according to the present invention (a state in which an infusion injector is connected to an outer needle hub).

FIG. 4 is a perspective view showing a configuration near a distal end portion of the indwelling needle assembly in a state where an inner needle and an outer needle are assembled.

FIG. 5 is a longitudinal sectional view showing a configuration near a distal end portion in a state where an inner needle and an outer needle of the indwelling needle assembly are assembled.

FIG. 6 is a longitudinal sectional view showing an embodiment (a state before inversion) of the valve body of the present invention.

FIG. 7 is a longitudinal sectional view showing an embodiment (a state after inversion) of the valve body of the present invention.

FIG. 8 is a sectional view taken along line AA in FIG.

FIG. 9 is a sectional view taken along the line BB in FIG. 7;

FIG. 10 shows another embodiment of the valve body of the present invention (state before inversion).
FIG.

FIG. 11 shows another embodiment of the valve body of the present invention (state after reversal).
FIG.

FIG. 12 shows another embodiment of the valve body of the present invention (state before reversal).
FIG.

FIG. 13 shows another embodiment of the valve body of the present invention (a state after inversion).
FIG.

FIG. 14 shows another embodiment of the valve body of the present invention (state before reversal).
FIG.

FIG. 15 shows another embodiment of the valve body of the present invention (state after reversal).
FIG.

16 is a longitudinal sectional view of the valve body shown in FIG.

17 is a longitudinal sectional view of the valve body shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Indwelling needle assembly 2 Outer needle (indwelling needle) 21 Reduced diameter part 22 Gap 23 Tip opening 3 Outer needle hub 31 Outer needle fixing part 32 Intermediate part 33 Fitting part 34 Inner cavity part 4 Inner needle 41 Needle tip 42 Blade surface 46 groove 47 edge portion 48 protrusion 5 inner needle hub 51 internal space 52 ventilation filter 53 cap 6 annular projection 61 ventilation filter 62 cap 63 root end 7 valve body 71 flange 72 hole 73 deformed portion 74 inner surface 74 'outer surface 75 Thick part 750 Thick part 755 Thick part 757 Thick part 76 Thin part 760 Thin part 765 Thin part 767 Thin part 77 Tip 78 Inner surface 78 'Outer surface 79 Inner surface 79' Outer surface 1a to 8a Surface 1b to 8c Surface 1c to 8c Surface 1d to 4d Outer peripheral surface 5d, 6d Tip surface 8 Protrusion 9 Infusion infusion tool 91 Tip 92 Opening 93 Base end 94 Tube

Claims (10)

[Claims] A hollow outer needle, an outer needle hub provided at a base end of the outer needle and having a lumen communicating with the inside of the outer needle, and an inner needle inserted into the outer needle. An inner needle hub provided at a base end of the inner needle; and an invertible valve body which is installed in the inner cavity of the outer needle hub so as to seal the inner cavity, and is made of an elastic material. An indwelling needle assembly having the valve body, wherein the outer peripheral shape of the cross section of the valve body in a state before inversion is non-circular, and the outer surfaces before inversion are in close contact with each other when inverted. A unique indwelling needle assembly. 2. The indwelling needle assembly according to claim 1, wherein an outer peripheral shape of a transverse cross section of the valve body before inversion is a polygon. 3. The indwelling needle assembly according to claim 1, wherein the outer peripheral shape of the cross section of the valve body before inversion is a shape combining a circular arc and a straight line. 4. The valve body according to claim 1, wherein the valve body has a thick portion having a larger thickness and a thin portion having a smaller thickness than the thick portion along a circumferential direction. The indwelling needle assembly according to any one of the preceding claims. 5. The indwelling needle assembly according to claim 1, wherein the valve body is inverted by friction when removing the inner needle inserted therethrough. 6. A reversible valve body having a hole through which a tubular body or a rod-shaped body can be inserted, and made of an elastic material, wherein the outer peripheral shape of a cross section of the valve body before inversion is non-reversible. A valve body having a circular shape, wherein when inverted, outer surfaces before inversion come into close contact with each other. 7. The valve body according to claim 6, wherein the outer peripheral shape of the cross section before the inversion is a polygon. 8. The valve body according to claim 6, wherein the outer peripheral shape of the cross section before the inversion is a shape combining a circular arc and a straight line. 9. The valve body according to claim 6, wherein the valve body has a thick portion having a larger thickness and a thin portion having a smaller thickness than the thick portion along a circumferential direction. 10. The valve body according to claim 6, wherein the valve body is inverted by friction when removing a tube or a rod inserted therein, or by a reversal assisting means provided on the tube or the rod. The valve element according to item 1.