JPH11347130A - Medical sheath - Google Patents

Abstract

(57) [Summary] [PROBLEMS] In a medical sheath in which a plurality of side holes are formed at a distal end portion, it is possible to further improve the securing of blood flow, and furthermore, it is easy to use even for a beginner and ensures the secure blood flow. To provide a medical sheath capable of realizing. A medical sheath (2) having a tubular sheath body (4) in which an insertion hole (3) is formed along an axial direction, a distal end portion is inserted inside the body, and a rear end portion is disposed outside the body.
A plurality of side holes 20 and 22 penetrating the inside and outside of the sheath body 4 are formed in the sheath body 4 within a predetermined length along the axial direction from the front end to the rear end of the sheath body 4. The opening ratio of these side holes 20 and 22 is larger on the rear end side than on the front end. In addition, these side holes 20,
Marks 24 corresponding to the distances La to Le from the side hole 22 located at the rearmost end of the sheath body 22 toward the rear end are formed on the outer periphery of the sheath body 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical sheath, and more particularly, to an improvement of a medical sheath which can easily secure a blood flow.

[0002]

2. Description of the Related Art An intra-aortic balloon pumping method (so-called IAB) used for treatment of cardiac function deterioration such as heart failure.
P method), a method of percutaneous coronary angioplasty (so-called PTCA) used for treatments such as expanding blood vessels around the heart.
In a therapeutic or diagnostic method such as a thermodilution catheter method (so-called TDC method) used for measuring the blood flow of the heart, a catheter tube is inserted into an arterial or venous blood vessel of a patient. A medical sheath (eg, a catheter introducer) is used to insert such a catheter tube into a patient's blood vessel.

[0003] The medical sheath has a sheath body in which an insertion hole is formed. A needle-shaped dilator is inserted into the sheath as necessary, and in this state, the distal end of the dilator is inserted into the blood vessel of the patient, and the insertion port of the blood vessel is spread by the dilator. After that, the dilator
Withdrawn from the proximal end of the sheath. The distal end of the sheath remains inserted into the insertion port of the blood vessel. Thereafter, the catheter is introduced into the blood vessel through the internal insertion hole of the sheath. By thus inserting the catheter into the blood vessel using the sheath, the catheter can be conveniently inserted into the blood vessel.

[0004]

However, when the inner diameter of the blood vessel is smaller than the outer diameter of the sheath, when there is a stenosis in the middle of the blood vessel, or when the blood vessel is meandering, etc. The flow of blood to the downstream side of the blood vessel into which the sheath has been inserted is hindered, which may cause problems such as impaired blood flow to the lower limbs.

[0005] In order to solve such a problem, a medical sheath having a side hole formed at a distal end portion of the sheath has been developed as disclosed in, for example, Japanese Patent Application Laid-Open No. 6-114113.
By forming the side hole at the distal end portion of the sheath in this manner, it is possible to secure blood flow through the side hole, and it is expected that a situation such as lower limb blood flow obstruction is reduced.

However, as shown in this publication, in a medical sheath having a plurality of side holes formed at the distal end, it has been desired to improve the sheath which can further improve the securing of blood flow.

[0007] In addition, even if the medical sheath having a plurality of side holes formed at the distal end portion is not properly used, if the blood flow through the side holes is not sufficiently ensured, etc. And further improvement was desired. For example, the thickness of the subcutaneous fat varies depending on the patient, but if the distal end of the sheath with side holes is inserted too much into the patient's blood vessel, the sheath will It is bent along the longitudinal direction, and that portion blocks the blood flow in the blood vessel. Conversely, when the distal end of the medical sheath is inserted shallowly into the patient's blood vessel, the side hole located at the most rear end side is exposed outside the blood vessel, from which blood leaks subcutaneously or outside the body. Problem. That is, when using a medical sheath having such a side hole formed, stopping insertion of the sheath at a position where the side hole located at the most rear end side just enters the blood vessel of the patient, This is preferable for securing blood flow through the side hole.
However, with the conventional medical sheath, it was difficult to stop insertion of the sheath at an appropriate position.

The present invention has been made in view of such circumstances, and provides a medical sheath having a plurality of side holes formed at a distal end thereof, which can further improve the securing of blood flow. As a first object.

Another object of the present invention is to provide a medical sheath having a plurality of side holes formed at a distal end thereof, which is easy to use even for a beginner and can surely secure a blood flow. This is the second purpose.

[0010]

In order to achieve the first object, a medical sheath according to a first aspect of the present invention comprises:
A medical sheath having a tubular sheath body in which an insertion hole is formed along the axial direction, a distal end portion is inserted inside the body, and a rear end side is disposed outside the body, and the medical sheath has a rear end extending from the distal end of the sheath main body. In the range of a predetermined length along the axial direction toward the end, a plurality of side holes penetrating the inside and outside of the sheath body are formed in the sheath body, and the opening ratio of these side holes is set at the tip. It is characterized in that it is larger on the rear end side. Means for increasing the aperture ratio of the side hole on the rear end side from the front end is not particularly limited, but the arrangement pitch of the side holes may be made denser on the rear end side than on the front end. Alternatively, the inner diameter of the side hole may be larger on the rear end side than on the front end, without or with a dense arrangement pitch.

In order to achieve the second object, a medical sheath according to a second aspect of the present invention has an insertion hole formed in an axial direction, a distal end portion inserted into a body, and a rear end portion. A medical sheath having a tubular sheath body in which a portion side is disposed outside the body, and a portion extending within a predetermined length in an axial direction from a front end to a rear end of the sheath main body, the inside and outside of the sheath main body. Are formed in the sheath main body, and a mark corresponding to a distance from the side hole located at the most rear end side of these side holes toward the rear end direction is provided on the sheath main body. Characterized by being formed on the outer periphery.

It is preferable that a stopper device is provided on the outer periphery of the sheath body so as to be movable along the axial direction of the sheath body.

[0013] In order to achieve the second object, a medical sheath according to a third aspect of the present invention has an insertion hole formed in the axial direction, a distal end portion inserted into the body, and a rear end. A medical sheath having a tubular sheath body whose part side is disposed outside the body, and a sheath hub attached to a rear end of the sheath body, wherein the sheath extends in the axial direction from the front end to the rear end of the sheath body. A plurality of side holes penetrating the inside and outside of the sheath main body are formed in the sheath main body in a range of a predetermined length along the lure tube communicating with the insertion hole of the sheath main body in the sheath hub. The luer tube is provided with a mark corresponding to the distance from the side hole located at the rearmost end of the side hole toward the rear end.

In the present invention, the mark is not particularly limited, and examples thereof include a printed scale, a color-coded pattern, a protruding mark, a concave mark, and the like.

[0015]

In the medical sheath according to the first aspect of the present invention,
The opening ratio of the side hole is larger on the rear end side than on the front end.
At the distal end of the sheath, a flow path for securing blood flow is also formed in the gap between the sheath and the catheter, but at the rear end side where the side hole in the sheath is formed, only the side hole is
It becomes a flow path for securing blood flow. In addition, since this sheath portion is bent along the longitudinal direction of the blood vessel, it is likely to block the flow path of the blood vessel, which may cause lower limb blood flow obstruction and the like. In the medical sheath according to the first aspect of the present invention, securing the blood flow can be further improved by increasing the opening ratio of the side hole formed in the sheath portion.

In the medical sheath according to the second aspect of the present invention, the mark corresponding to the distance from the side hole located at the most rear end side of the plurality of side holes toward the rear end direction is provided on the sheath body. It is formed on the outer circumference. Therefore, when this medical sheath is inserted from the patient's skin and the distal end of the sheath having the side hole is inserted into the blood vessel of the patient, the distal end of the sheath having the side hole enters the inside of the patient's skin. However, the distance from the side hole to the skin surface can be grasped at a glance from the relationship between the skin surface and the mark. Therefore,
At the position where the side hole located at the most rear end side just enters the blood vessel of the patient, it becomes easy to stop insertion of the sheath, and it is ensured that blood flow through the side hole is ensured.

[0017] In the medical sheath according to the third aspect of the present invention, the luer tube is provided not in the sheath body but in a distance from the side hole located at the most rear end side of the plurality of side holes toward the rear end. Corresponding marks are provided. For this reason,
When inserting this medical sheath from the patient's skin and inserting the sheath tip with the side hole formed into the blood vessel of the patient,
Even if the distal end of the sheath having the side hole enters the inside of the skin of the patient, the distance from the side hole to the skin surface can be grasped at a glance based on the luer tube.
Therefore, it is easy to stop the insertion of the sheath at a position where the side hole located at the rearmost end just enters the blood vessel of the patient, and it is ensured that the blood flow through the side hole is ensured.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments shown in the drawings.

First Embodiment FIG. 1 is a front view of a medical sheath according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a main part showing a method of using the medical sheath shown in FIG. 1, and FIG. IA using the medical sheath shown in
It is the schematic which performs BP treatment.

The medical sheath 2 according to the present embodiment is shown in FIG.
As shown in FIGS. 2 and 3, an insertion hole 3 is formed along the axial direction, a distal end is inserted inside the body, and a rear end side is disposed outside the body. A sheath hub 6 joined to the rear end. The sheath body 4 is formed of a hollow cylindrical tube, and the catheter 40 is inserted through the inside thereof.

As shown in FIG. 2, the sheath body 4 is made of a material that can be bent along the blood vessel 32, and is made of, for example, a tube made of fluororesin, polyurethane, or polyamide. The inner diameter of the sheath body 4 is the catheter 40
Is determined to be insertable, and is not particularly limited, but is, for example, 1.0 to 5.0 mm, and has a thickness of, for example, 0.
1 to 1.0 mm.

A sheath hub 6 is joined to the rear end of the sheath body 4 by means such as adhesion, fusion or fitting. A luer tube 8 is connected to the sheath hub 6. The luer tube 8 communicates with the insertion hole 3 of the sheath body 4, and through this luer tube 8, blood can be sucked, and a medicinal solution such as heparin or a physiological saline solution can be injected. A valve such as a three-way valve 10 is attached to the distal end of the luer tube 8.

The sheath hub 6 has, for example, a flexural modulus of 5
000 to 30,000 kg / cm ² of rigid synthetic resin, specifically, ABS, polyvinyl chloride (PV
C), polyacetal, polyacrylonitrile, nylon, polyethylene (PE), polycarbonate (P
C) or polypropylene (PP).

As shown in FIG. 2, an insertion port 14 is formed at the rear end of the sheath hub 6 of the medical sheath 2 according to the present embodiment, and the medical valve 12 is mounted inside the insertion port 14. is there. In the present embodiment, as shown in FIG. 2, the medical valve body 12 has, at the center thereof, a contact hole through which a long insert such as the catheter 40 can be inserted while maintaining liquid tightness. The close contact hole of the valve body 12 is, for example, a combination of a through hole and a slit, so that the inside is sealed even when the catheter 40 is not inserted into the close contact hole of the valve body 12.

The material of the valve body 12 is not particularly limited.
For example, it is composed of synthetic rubber such as natural rubber, butyl rubber, ethylene-propylene rubber, polybutadiene rubber, polyisoprene rubber, silicone rubber, polyurethane, and fluoro rubber, preferably silicone rubber.

As shown in FIG. 1, in the medical sheath 2 according to the present embodiment, the inside of the sheath main body 4 is within a predetermined length L2 along the axial direction from the front end to the rear end of the sheath main body 4. Side holes 20 and 2 penetrating through to the outside
2 is formed on the sheath body 4. Side holes 20 and 22
Is not particularly limited, but is preferably 0.5 to 3 mm.
mm, more preferably 1-2 mm.

The arrangement pitch of these side holes is made denser by the arrangement pitch P2 of the side holes 22 on the rear end side than the arrangement pitch P1 of the side holes 20 on the front end side. The arrangement pitch P1 of the side holes 20 on the tip side is not particularly limited, but is preferably 10 to 4
0 mm, more preferably 10 to 20 mm. The arrangement pitch P2 of the side holes 22 on the rear end side is preferably 20 to 80% as compared with the arrangement pitch P1 of the side holes 20 on the front end side.
More preferably, it is shortened by 40 to 70%. These arrangement pitches may be changed stepwise from the front end side to the rear end side, or may be gradually changed. Also,
These side holes 20 and 22 may be arranged linearly along the axial direction of the sheath, or may be arranged curvedly or alternately. Further, these side holes 20 and 22
Preferably, a plurality of the sheaths are formed in the circumferential direction at substantially the same axial position of the sheath. However, the side holes 20 and 22
It is necessary to take care that the strength of the sheath body 4 is not excessively reduced by forming the sheath body 4 at the distal end of the sheath body 4.

The range of the length L2 of the sheath distal end portion where the side holes 20 and 22 are formed is preferably 20 to 80%, more preferably 30 to 70% of the total length L1 of the sheath body 4.
% Range. Further, the overall length L1 of the sheath body 4 is not particularly limited, but is preferably 50 to 300 mm, and more preferably 110 to 250 mm.

The insertion of the IABP balloon catheter 40 into a blood vessel using the medical sheath 2 according to the present embodiment is performed as follows. First, a puncture needle composed of an outer trocar (cannula) and an inner trocar (not shown) is pierced from above the skin 30 of the patient shown in FIG. 2, and the tip is positioned in the blood vessel 32. Next, the inner trocar is extracted while leaving the outer trocar (cannula), and a guide wire is inserted into the blood vessel 32 from the hole from which the inner trocar has been extracted.

Next, along the inserted guide wire,
Pull out the trocar, then along the guide wire,
Medical sheath 2 and dilator (not shown) of this embodiment
And the distal end of the catheter tube insertion tool
Into the blood vessel 32 from above.

When the distal end of the catheter tube insertion tool including the integrated medical sheath 2 and the dilator is inserted into the insertion port of the blood vessel, the tapered distal end formed at the distal end of the dilator is inserted into the insertion port of the blood vessel. Push out. Further, when the distal end of the catheter tube insertion tool is pushed in, the distal end of the sheath body 4 is also inserted into the blood vessel.

Thereafter, the dilator is withdrawn, and instead, the balloon catheter 40 is inserted along the guide wire from the insertion port 14 formed at the rear end of the sheath 2 so that the catheter 40 can be conveniently inserted into the blood vessel 32. Inserted well. The state is shown in FIG.

Then, as shown in FIG. 3, with the distal end of the balloon portion 42 attached to the distal end of the balloon catheter 40 positioned in a blood vessel near the heart 50, A pump device 46 and a blood pressure fluctuation measuring device 48 are connected to a connector 44 mounted on the distal end. The pump device 46 sends the shuttle gas through the lumen of the balloon catheter 40 to the balloon section 42.
Introduce or derive within. In addition, the balloon catheter 4
When the balloon portion 42 is inserted into the blood vessel 32 through the inside of the sheath 2, the balloon portion 42 is folded to have a small outer diameter.

The shuttle gas introduced from the pump device 46 to the balloon portion 42 is not particularly limited. However, helium having a small viscosity and a small mass is used so that the balloon portion 42 expands or contracts rapidly according to the driving of the pump device 46. Gas or the like is used. The blood pressure fluctuation measurement device 48
Fluctuations in blood pressure in the artery detected at the distal end of the balloon catheter 40 can be measured. Based on the fluctuation of the blood pressure measured by the blood pressure measurement device 48, the pump device 46 is controlled according to the pulsation of the heart 50, and the balloon portion 42 is expanded and contracted in a short cycle of 0.2 to 1 second. An auxiliary treatment of the heart 50 is performed.

In this embodiment, even during the IABP treatment using such a balloon catheter 40, as shown in FIG.
Since the and 22 are formed, a good blood flow can be secured inside the blood vessel 32. That is, even when the distal end portion of the sheath body 4 is passing through the stenotic portion 33 or the meandering portion of the blood vessel 32, the blood flow in the direction of arrow A in FIG. Satisfactorily is ensured by passing through the gap between the side holes 20 and 22.

In particular, in the sheath 2 according to the present embodiment, the arrangement pitch of the side holes 20 and 22 is made closer on the rear end side than on the front end, so that the blood flow can be further secured. At the distal end of the sheath body 4, a flow path for securing blood flow is also formed in a gap between the sheath body 4 and the catheter 40, but the rear end side of the sheath body 4 in a range where a side hole is formed. In this case, only the side hole 22 serves as a flow path for securing blood flow, and since this portion is a portion that is bent along the longitudinal direction of the blood vessel 32, the flow path of the blood vessel is easily blocked. In this embodiment, securing the blood flow flowing to the lower limb side is further improved by densely arranging the pitches of the side holes 22 formed in the sheath portion corresponding to a portion where the flow path is particularly likely to be blocked. Can be.

Second Embodiment FIG. 4 is a front view of a medical sheath according to another embodiment of the present invention. As shown in FIG. 4, the medical sheath 2a according to the present embodiment is the same as the medical sheath 2 according to the first embodiment.
In this embodiment, most of the components are common, and in the following description, different parts will be described in detail.

In the medical sheath 2a according to the present embodiment,
Similarly to the sheath 2 of the first embodiment, a plurality of side holes penetrating the inside and outside of the sheath body 4 within a predetermined length in the axial direction from the front end to the rear end of the sheath body 4. 20 and 22 are formed in the sheath body 4.

In the present embodiment, the scale 24 as a mark corresponding to the distance La to Le from the side hole 22 located at the most rear end side of the side holes 20 and 22 toward the rear end direction is provided in the sheath body. 4 is formed on the outer periphery. Note that the scales 24 corresponding to the distances La to Le are merely examples, and the scales 24 corresponding to finer distances.
It may be.

The scale 24 is formed on the outer periphery of the sheath body 4 by means such as printing or engraving. The scale 24 may also display numbers corresponding to the actual distances La to Le. In addition, different colors may be applied corresponding to the respective distances La to Le. Each distance L at which the scale 24 is attached
a to Le are distances determined in accordance with the thickness t from the surface of the patient's skin 30 to the blood vessel 32 shown in FIG.
The distance varies depending on the height, weight, thickness of subcutaneous fat and the like of the patient.

In this embodiment, the minimum distance La of the scale 24 is preferably 5 to 30 mm, particularly preferably 10 to 20 mm so that the maximum distance Le of the scale 24 can be applied to all patients. Preferably 30-1
00 mm, particularly preferably 30 to 80 mm. The minimum unit of the scale 24 is not particularly limited, but is preferably 5 to 30 mm, and more preferably 10 to 20 m.
m. If the minimum unit of the scale 24 is too small, it is difficult for the operator to distinguish at a glance, and if the minimum unit of the scale 24 is too large, fine adjustment tends to be difficult.

In the medical sheath 2a according to the present embodiment,
A mark 24 corresponding to a distance La to Le from the side hole located at the rearmost end of the plurality of side holes 20 and 22 toward the rear end is formed on the outer periphery of the sheath body 4. Therefore, as shown in FIG. 2, when the medical sheath 2 a is inserted from the skin 30 of the patient and the distal end of the sheath having the side holes 20 and 22 is inserted into the blood vessel 32 of the patient, the side holes 20 and Even if the sheath tip in which the 22 is formed enters the inside of the skin 30 of the patient, the distance La to Le from the side hole to the skin surface can be grasped at a glance by the relationship between the surface of the skin 30 and the scale 24. it can. Therefore, it is easy to stop the insertion of the sheath 2a at a position where the side hole 22 located at the rearmost side just enters the blood vessel 32 of the patient, and secure blood flow through the side holes 20 and 22. Will be sure.

Incidentally, in the case of the conventional medical sheath, it was difficult to determine how much the sheath was inserted into the skin. Therefore, if the distal end of the sheath is inserted too far into the blood vessel of the patient, the sheath is bent along the longitudinal direction of the blood vessel at the portion where the side hole is not formed, and that portion is bent by the blood inside the blood vessel. There was the inconvenience of blocking the flow. Conversely, when the distal end of the medical sheath is inserted shallowly into the patient's blood vessel, the side hole located at the most rear end side is exposed outside the blood vessel, from which blood leaks subcutaneously or outside the body. There was an inconvenience.

In the medical sheath 2a according to the present embodiment,
The extent to which the sheath 2a has been inserted into the skin 30 can be easily determined, and the conventional inconvenience can be solved.

Third Embodiment FIG. 5 is a front view of a medical sheath according to another embodiment of the present invention. As shown in FIG. 5, the medical sheath 2b according to the present embodiment is the same as the medical sheath 2 according to the second embodiment.
This is a modified example of a, in which most of the constituent members are common, and in the following description, different parts will be particularly described in detail.

In the medical sheath 2b according to the present embodiment,
Similar to the sheath 2a of the second embodiment, the sheath body 4
A plurality of side holes 20 and 22 penetrating through the inside and outside of the sheath body 4 are formed in the sheath body 4 within a predetermined length along the axial direction from the front end to the rear end of the sheath body 4.
Further, similarly to the second embodiment, in the sheath 2b of the present embodiment, the distance La from the side hole 22 located at the most rear end side of the side holes 20 and 22 toward the rear end direction.
Scales 24 as marks corresponding to .about.Le are formed on the outer periphery of the sheath body 4.

Furthermore, the medical sheath 2b according to the present embodiment
In the figure, a stopper device 28 movable along the axial direction of the sheath body 4 is provided on the outer periphery of the sheath body 4. The stopper device 28 is made of, for example, a resilient ring-shaped rubber material, and is movable along the axial direction of the sheath body 4 and can be stopped at a predetermined position in the axial direction of the sheath body 4. Has become. This stopper device 28
Is moved along the axial direction of the sheath body 4 so that the scale 2
Stop at the predetermined position of 4. The stop position is a predetermined position on the scale 24 determined from data such as the height, weight, and thickness of subcutaneous fat of the patient. By stopping the stopper device 28 at that position, the distal end of the sheath 2b does not enter the skin 30 shown in FIG.

Therefore, in the medical sheath 2b according to the present embodiment, as shown in FIG.
Is inserted through the skin 30 of the patient, and when the distal end of the sheath having the side holes 20 and 22 formed therein is inserted into the blood vessel 32 of the patient, the side hole 22 located at the most rear end side has the blood vessel 32
It is easy to stop insertion of the sheath 2 at a position just entering the inside, and it is ensured that blood flow through the side holes 20 and 22 is ensured. That is, in the medical sheath 2 b according to the present embodiment, when the sheath 2 b is inserted into the skin 30 without determining how much the sheath 2 b has been inserted into the skin 30 until the stopper device 28 hits the surface of the skin 30.
The sheath 2b may be inserted into the skin 30.

Fourth Embodiment A medical sheath according to the present embodiment is a modification of the medical sheath 2b according to the third embodiment. As shown in FIG. In addition, a scale 26 is provided as a mark corresponding to the distance from the side hole located at the rearmost end of the plurality of side holes 20 and 22 toward the rear end. The scale 26 can be formed on the luer tube 8 together with or without forming the scale 24 formed on the sheath body 4.

Also in the medical sheath according to the present embodiment, when the medical sheath is inserted from the patient's skin and the distal end of the sheath having the side hole is inserted into the blood vessel of the patient, the side hole is formed. Even if the sheath tip enters the inside of the patient's skin, the distance from the side hole to the skin surface,
It can be grasped at a glance based on the scale 26 of the luer tube 8. Therefore, it is easy to stop the insertion of the sheath at a position where the side hole 22 located at the rearmost side just enters the blood vessel 32 of the patient, and the side holes 20 and 22 can be easily stopped.
It is ensured that blood flow through the blood is secured.

Other Embodiments The present invention is not limited to the above-described embodiments, but can be variously modified within the scope of the present invention.

For example, in the above-described embodiment, the case where the IABP balloon catheter 40 is inserted using the medical sheath according to the present invention has been described. However, the use of the medical sheath according to the present invention is not particularly limited. It can be used for all cases where other catheters (including guide wires) are inserted into the body cavity.

[0053]

As described above, according to the medical sheath according to the present invention, in a medical sheath having a plurality of side holes formed at the distal end, it is possible to further improve the securing of blood flow. .

Further, according to the medical sheath according to the present invention, a medical sheath having a plurality of side holes formed at the distal end is easy to use even for a novice and can surely secure blood flow. A sheath can be provided.

[Brief description of the drawings]

FIG. 1 is a front view of a medical sheath according to one embodiment of the present invention.

FIG. 2 is a sectional view of a main part showing a method of using the medical sheath shown in FIG.

FIG. 3 shows an IA using the medical sheath shown in FIG.
It is the schematic which performs BP treatment.

FIG. 4 is a front view of a medical sheath according to another embodiment of the present invention.

FIG. 5 is a front view of a medical sheath according to another embodiment of the present invention.

[Explanation of symbols]

 2, 2a, 2b ... medical sheath 3 ... insertion hole 4 ... sheath body 6 ... sheath hub 8 ... luer tube 20, 22 ... side hole 24, 26 ... scale (mark) 30 ... skin 32 ... blood vessel

Claims (4)

[Claims] 1. A medical sheath having a tubular sheath body in which an insertion hole is formed along an axial direction, a distal end portion is inserted inside the body, and a rear end portion is disposed outside the body. In a range of a predetermined length along the axial direction from the front end to the rear end of the main body, a plurality of side holes penetrating the inside and the outside of the sheath main body are formed in the sheath main body,
A medical sheath characterized in that the opening ratio of these side holes is larger on the rear end side than on the front end. 2. A medical sheath having a tubular sheath body in which an insertion hole is formed along an axial direction, a distal end portion is inserted inside a body, and a rear end side is arranged outside the body. In a range of a predetermined length along the axial direction from the front end to the rear end of the main body, a plurality of side holes penetrating the inside and the outside of the sheath main body are formed in the sheath main body,
A medical sheath, wherein a mark corresponding to a distance from the side hole located at the rearmost end side of the side holes toward the rear end is formed on the outer periphery of the sheath main body. 3. The medical sheath according to claim 1, wherein a stopper device is provided on an outer periphery of the sheath body so as to be movable in an axial direction of the sheath body. 4. A tubular sheath body in which an insertion hole is formed along the axial direction, a distal end portion is inserted inside the body, and a rear end side is disposed outside the body. A medical sheath having a sheath hub, wherein a plurality of side holes penetrate through the inside and outside of the sheath body in a range of a predetermined length along the axial direction from the front end to the rear end of the sheath body. Is formed in the sheath main body, a luer tube communicating with the insertion hole of the sheath main body is connected to the sheath hub, and the luer tube is located at the most rear end side of the side hole. Medical sheath provided with a mark corresponding to the distance from the side hole to the rear end direction.