CN115868988B - A blood collection needle - Google Patents

Abstract

The embodiment of the invention provides a blood taking needle, wherein a first matching part is arranged on a shell of the blood taking needle, a second matching part is arranged on a sliding cylinder, and the first matching part is matched with the second matching part so as to prevent the sliding cylinder from returning to a original position after a needle core executes a transmitting action. The needle core executes the emission action, namely the blood taking needle executes the blood taking action, and therefore, in the scheme, after the blood taking needle performs blood taking once, the sliding cylinder cannot be reset, and therefore, the blood taking needle cannot be reused.

Description

A blood collection needle

Technical Field

The invention relates to the technical field of medical devices, in particular to a blood collection needle.

Background Art

A blood collection needle is an instrument used to collect blood samples during medical examinations. The blood collection needle generally includes a shell, a slide, a needle core and an elastic member. The use process generally includes: pressing the slide to move the needle core to a suitable position, and firing under the drive of the elastic member.

Blood collection needles are mostly disposable items, but some unscrupulous users will reuse blood collection needles in order to save costs, which poses a great medical risk.

Summary of the invention

The purpose of the embodiment of the present invention is to provide a blood collection needle to solve the problem of repeated use of the blood collection needle.

To achieve the above object, an embodiment of the present invention provides a blood collection needle, comprising:

shell;

A slide cylinder; the slide cylinder comprises an inner sleeve and an outer sleeve connecting portion, the outer sleeve connecting portion is sleeved on the radial outer side of the inner sleeve, at least a portion of the inner sleeve is arranged inside the outer sleeve, and at least a portion of the outer sleeve connecting portion is arranged on the radial outer side of the outer sleeve;

A needle core is arranged in a space defined by the housing and the slide cylinder;

An elastic member, disposed in the space defined by the housing and the slide, and adapted to provide power for launching the needle core;

Wherein, the shell is provided with a first matching portion, and the outer sleeve connection portion is provided with a second matching portion, and the first matching portion matches with the second matching portion to prevent the slide cylinder from returning to the original position after the needle core performs the firing action.

Optionally, the first mating portion allows the second mating portion to pass over the first mating portion from a first direction, while blocking the second mating portion from passing over the first mating portion from a second direction; the first direction is the direction opposite to the launching direction of the needle core, and the second direction is the launching direction of the needle core.

Optionally, the second matching portion is an elastic arm, a side of the elastic arm close to the distal end of the blood sampling is fixedly connected to the outer sleeve connection portion, and a side close to the proximal end of the blood sampling is inclined toward the inner sleeve;

The first matching portion is a transverse rib arranged on a radial edge of the shell.

Optionally, the second matching portion is an elastic arm, a side of the elastic arm close to the distal end of the blood sampling is fixedly connected to the outer sleeve connection portion, and a side close to the proximal end of the blood sampling is inclined toward the inner sleeve;

The first matching portion is a first groove arranged on the housing, and a side wall of the first groove close to the proximal end of the blood sampling block the second matching portion from passing over the first matching portion from the second direction.

Optionally, the second matching portion is an elastic arm, a side of the elastic arm close to the proximal end of the blood sampling is fixedly connected to the outer sleeve contact portion, and a side close to the distal end of the blood sampling is provided with a first abutment portion;

The first matching portion is a transverse rib disposed on a radial edge of the housing, and the transverse rib abuts against the first abutting portion to prevent the second matching portion from passing over the first matching portion from the second direction.

Optionally, the second matching portion is an elastic arm, a side of the elastic arm close to the proximal end of the blood sampling is fixedly connected to the outer sleeve contact portion, and a side close to the distal end of the blood sampling is provided with a first abutment portion;

The first matching portion is a second groove arranged on the shell, and the side wall of the second groove close to the proximal end of the blood collection abuts against the first abutting portion to prevent the second matching portion from passing over the first matching portion from the second direction.

Optionally, a second abutment portion is provided on the outer wall of the inner sleeve, and a guide portion is provided on the inner wall of the outer shell, and the second abutment portion is suitable for moving along the guide portion based on a pressing force to trigger the firing action of the needle core.

Optionally, the needle core is provided with a needle wing, and the inner sleeve is provided with a slot. When the blood collection needle is in a locked state, the inner sleeve abuts against the needle wing to block the launching action of the needle core. When the blood collection needle is in a launching state, the needle wing enters the slot to release the blocking of the needle core.

The second abutment portion is suitable for moving along the guide portion based on a pressing force, so that the slide cylinder rotates relative to the housing and generates an axial displacement, driving the needle wing to enter the slot.

Optionally, the guide portion is a first inclined surface arranged circumferentially, and the second abutment portion is a vertical rib.

Optionally, an accommodating space for the second matching portion is provided on the outer wall of the shell; and a second inclined surface arranged circumferentially constitutes a partial boundary of the accommodating space.

Optionally, a needle cap is provided on the needle core, a convex portion is provided on the needle cap, and a third groove is provided on the inner sleeve;

When the needle cap is in the first state, the inner sleeve abuts against the raised portion to prevent the needle cap from being separated from the needle core; when the needle cap is in the second state due to the rotational force, the third groove cooperates with the raised portion to separate the needle cap from the needle core.

Optionally, based on the separation of the needle cap and the needle core, the elastic member drives the needle core to move toward the proximal end of blood collection until the needle core abuts against the inner sleeve, and the blood collection needle enters a locked state.

Optionally, a first connecting portion is provided on the inner wall of the outer sleeve connecting portion, and the first connecting portion is connected to the first matching portion.

Optionally, the first connecting portion is a hanging portion, and the first matching portion is a transverse rib arranged on a radial edge of the shell.

Optionally, a second connecting portion is provided on one side of the inner wall of the shell close to the distal end of blood sampling, and the second connecting portion is suitable for fixing one side of the elastic member close to the distal end of blood sampling.

In the embodiment shown in the application of the present invention, the housing is provided with a first matching portion, and the slide cylinder is provided with a second matching portion, and the first matching portion cooperates with the second matching portion to prevent the slide cylinder from returning to the original position after the needle core performs the firing action. The firing action of the needle core is the blood collection needle performing the blood collection action. It can be seen that in this solution, after the blood collection needle performs a blood collection, the slide cylinder cannot be reset, so the blood collection needle cannot be reused. This solution solves the problem of reusing the blood collection needle.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

1A-1E are schematic structural diagrams of a housing provided by an embodiment of the present invention;

2A-2E are schematic diagrams of the structure of a slide provided by an embodiment of the present invention;

3 and 4 are schematic diagrams showing the positions of the protrusions in the needle core when the needle core is rotated at different angles according to an exemplary embodiment of the present invention;

5 to 8 are schematic diagrams of the cooperation between the transverse ribs and the elastic arms in different viewing angles and under different states provided by an exemplary embodiment of the present invention;

FIG9 is a schematic diagram of a matching relationship between a second abutting portion and a guide portion provided by an embodiment of the present invention;

10 and 11 are schematic diagrams of different positional relationships between a pin wing and a slot provided by an exemplary embodiment of the present invention;

12A and 12B are schematic diagrams of the internal structure of the lancing device after the needle cap is removed from different viewing angles provided by an exemplary embodiment of the present invention;

FIG13 is a schematic diagram of the overall appearance of a blood collection needle provided by an embodiment of the present invention;

FIG14 is a schematic structural diagram of another second matching portion provided by an embodiment of the present invention;

15-16 are schematic diagrams showing the cooperation between the transverse ribs and the elastic arms at different viewing angles and in different states provided by an embodiment of the present invention.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field based on this application belong to the scope of protection of the present invention.

In order to achieve the above-mentioned purpose, an embodiment of the present invention provides a blood collection needle. The blood collection needle provided by the embodiment of the present invention is exemplarily described below with reference to FIGS. 1A-16 .

The blood collection needle comprises a housing 10, a slide cylinder 20, a needle core 30 and an elastic member 40. Figures 1A-1E are schematic structural diagrams of a housing 10 in an exemplary embodiment of the present invention. Figures 2A-2D are schematic structural diagrams of a slide cylinder 20 in an exemplary embodiment of the present invention.

As shown in Fig. 2A, Fig. 2B, Fig. 2D and Fig. 2E, the slide 20 includes an inner sleeve 280 and an outer sleeve joint 290, and the outer sleeve joint 290 is sleeved on the radial outer side of the inner sleeve 280. As shown in Fig. 3, at least a portion of the inner sleeve 280 is disposed inside the outer shell 10, and at least a portion of the outer sleeve joint 290 is disposed on the radial outer side of the outer shell 10.

As shown in FIG. 3 , the needle core 30 is disposed in the space defined by the housing 10 and the slide cylinder 20 ; the elastic member 40 is disposed in the space defined by the housing 10 and the slide cylinder 20 , and is suitable for providing power for launching the needle core 30 .

As shown in Figures 1A and 1B, the housing 10 is provided with first matching parts 102 and 109, and as shown in Figures 2A, 2C and 2E, the outer sleeve connection part 290 is provided with second matching parts 201 and 206, and the first matching parts cooperate with the second matching parts to prevent the slide 20 from returning to the original position after the needle core 30 performs the firing action.

In the drawings shown in the embodiments of the present invention, two first matching parts are provided on the housing 10, and two second matching parts are provided on the outer sleeve 290. This is only for illustration, and does not limit the number and specific positions of the first matching parts and the second matching parts. For example, one first matching part can be provided on the housing 10, and one second matching part can be provided on the outer sleeve 290; or, more than two first matching parts are evenly provided in the circumference of the housing 10, and more than two second matching parts are evenly provided in the circumference of the outer sleeve 290. The first matching part and the second matching part can be provided in pairs, and the first matching part and the second matching part mentioned in the embodiments of the present invention can be understood as the same pair of matching parts.

In an exemplary embodiment of the present invention, the first mating portion allows the second mating portion to pass over the first mating portion from a first direction, while blocking the second mating portion from passing over the first mating portion from a second direction; the first direction is a direction opposite to the launching direction of the needle core, and the second direction is the launching direction of the needle core.

In some cases, the slide cylinder needs to be pressed during the use of the blood collection needle, and the direction of pressing the slide cylinder is usually opposite to the firing direction of the needle core. In this embodiment, the second matching portion can pass over the first matching portion in the opposite direction of the firing direction of the needle core, but cannot be reset in the reverse direction. Therefore, the slide cylinder can be pressed normally without affecting the use of the blood collection needle. However, after pressing the slide cylinder, the slide cylinder cannot return to its original position, so the blood collection needle cannot be reused.

Regarding the structure and matching form of the first matching portion and the second matching portion, a variety of solutions are provided in the following content.

Solution 1, as shown in FIG. 2A , the second matching portion 201 is an elastic arm, the side of the elastic arm close to the distal end of the blood collection is fixedly connected to the outer sleeve 290 , and the side close to the proximal end of the blood collection is inclined toward the inner sleeve 280 ;

As shown in FIG. 1A and FIG. 1B , the first matching portions 102 and 109 are transverse ribs disposed on the radial edge of the housing 10 .

The proximal end of blood collection in the embodiment of the present invention can be understood as the end close to the blood collection position, and the distal end of blood collection in the embodiment of the present invention can be understood as the end far away from the blood collection position.

The coordination between the transverse ribs and the elastic arms can be shown in Figures 5 and 6. In order to more clearly show the coordination between the transverse ribs and the elastic arms, some parts are hidden in Figures 5 and 6. In Figure 5, the needle cap of the needle core 30 is not removed. In Figure 5, the side of the elastic arm 206 close to the distal end of the blood collection is fixedly connected to the outer sleeve 290, and the side close to the proximal end of the blood collection is inclined toward the inner sleeve 280. In the state shown in Figure 5, if the slide 20 moves toward the distal end of the blood collection, as shown in Figure 6, the elastic arms 201 and 206 will be stretched outwards under the action of the transverse ribs 102 and 109, or opened in a direction away from the axis.

The following describes the coordination between the transverse ribs and the elastic arms from the perspective of the cross-sectional view in conjunction with Figures 7 and 8. In Figures 7 and 8, the needle caps have been removed. Figure 7 can be understood as the state before the needle core is fired, and Figure 8 can be understood as the state after the needle core is fired. In Figure 7, the elastic arms 201 and 206 are fixedly connected to the outer sleeve 290 on the side close to the distal end of the blood collection, and the side close to the proximal end of the blood collection is inclined toward the inner sleeve 280. In the state shown in Figure 7, if the slide 20 moves toward the distal end of the blood collection, the elastic arms 201 and 206 will be stretched outwards under the action of the transverse ribs 102 and 109, or opened in a direction away from the axis. As shown in FIG8 , the elastic arms 201 and 206 will retract to the initial state (or unopened state) after crossing the transverse ribs 102 and 109. In the state shown in FIG8 , the elastic arms 201 and 206 cannot reverse (move toward the proximal end of blood collection) and cross the transverse ribs 102 and 109, that is, the slide tube 20 can no longer be reversed and reset, and the blood collection needle cannot be reused.

Solution 2: The second matching part is an elastic arm, the side of the elastic arm close to the distal end of the blood collection is fixedly connected to the outer sleeve joint, and the side close to the proximal end of the blood collection is inclined toward the inner sleeve;

The first matching portion is a first groove arranged on the housing, and the side wall of the first groove close to the proximal end of the blood sampling block the second matching portion from passing over the first matching portion from the second direction.

The difference between Scheme 2 and Scheme 1 is that in Scheme 1, the first matching portion is a transverse rib, while in Scheme 2, the first matching portion is a groove.

Solution 3, as shown in FIGS. 14-16 , the second matching part is elastic arms 213 and 214 , the side of the elastic arms 213 and 214 close to the proximal end of the blood sampling is fixedly connected to the outer cover 290 , and the side close to the distal end of the blood sampling is provided with a first abutting part;

The first matching portion is transverse ribs 102 and 109 disposed on the radial edge of the housing, and the transverse ribs abut against the first abutting portion to prevent the second matching portion from passing over the first matching portion from the second direction.

For example, the first abutting portion may be a hook, a protrusion, etc., and the specific structure is not limited.

The coordination between the transverse rib and the elastic arm can be shown in Figures 15 and 16. In order to more clearly show the coordination between the transverse rib and the elastic arm, some parts are hidden in Figures 15 and 16. In Figure 15, the needle cap of the needle core 30 is not removed. In Figure 15, the side of the elastic arm 214 close to the proximal end of the blood collection is fixedly connected to the outer sleeve joint 290. In the state shown in Figure 15, if the slide 20 moves toward the distal end of the blood collection, as shown in Figure 16, the elastic arm 214 passes over the transverse rib 109, but due to the effect of the first abutment, the elastic arm 214 can no longer reverse (move toward the proximal end of the blood collection) and pass over the transverse rib 109.

The difference between Scheme 3 and Scheme 1 lies in the structure of the elastic arm. In Scheme 1, one side of the elastic arm close to the distal end of blood collection is fixed, and the other side is inclined toward the inner sleeve. In Scheme 3, one side of the elastic arm close to the proximal end of blood collection is fixed, and abutment is provided on the other side.

Solution 4: The second matching part is an elastic arm, the side of the elastic arm close to the proximal end of the blood sampling is fixedly connected to the outer sleeve connecting part, and the side close to the distal end of the blood sampling is provided with a first abutting part;

The first matching portion is a second groove arranged on the shell, and the side wall of the second groove close to the proximal end of the blood collection abuts against the first abutting portion to prevent the second matching portion from passing over the first matching portion from the second direction.

The difference between Scheme 4 and Scheme 3 is that in Scheme 3, the first matching portion is a transverse rib, while in Scheme 4, the first matching portion is a groove.

In an exemplary embodiment of the present invention, as shown in FIG. 2C and FIG. 2D, the outer wall of the inner sleeve 280 is provided with second abutting portions 211 and 212, and as shown in FIG. 1B, FIG. 1C and FIG. 1D, the inner wall of the outer shell 10 is provided with guide portions 101 and 108. In the drawings shown in the embodiment of the present invention, two guide portions are provided on the outer shell 10, and two second abutting portions are provided on the inner sleeve 280. This is only for illustration, and the number and specific position of the guide portions and the second abutting portions are not limited. For example, one guide portion can be provided on the outer shell 10, and one second abutting portion can be provided on the inner sleeve 280; or, more than two guide portions are uniformly provided in the circumference of the outer shell 10, and more than two second abutting portions are uniformly provided in the circumference of the inner sleeve 280. The guide portion and the second abutting portion can be provided in pairs, and the guide portion and the second abutting portion mentioned in the embodiment of the present invention can be understood as the same pair of guide portions and second abutting portions.

As shown in FIG. 9 and FIG. 12B , the second abutting portion 211 is adapted to move along the guide portion 101 based on a pressing force to trigger the firing action of the needle core 30 .

For example, in one case, the guide portion is a first inclined surface arranged circumferentially, and the second abutting portion is a vertical rib. In this way, when the second abutting portion moves along the guide portion, it performs both rotational motion and axial displacement. Alternatively, in other cases, the guide portion may also be a groove, and the second abutting portion may be a protrusion, and the two cooperate to produce both circumferential displacement and axial displacement. The embodiments of the present invention do not limit the specific structures of the guide portion and the second abutting portion.

In an exemplary embodiment of the present invention, as shown in FIG. 7 , the needle core 30 is provided with a needle wing 390 , and 304 and 305 shown in FIG. 4 can be understood as the surfaces in the needle wing 390 . As shown in FIG. 2B , FIG. 2C , FIG. 2D and FIG. 2E , the inner sleeve 280 is provided with slots 203 and 208 . In the drawings shown in the embodiment of the present invention, two needle wings are provided on the needle core 30 and two slots are provided on the inner sleeve 280 . This is only for illustrative purposes and does not limit the number and specific positions of the needle wings and slots. For example, one needle wing can be provided on the needle core 30 and one slot can be provided on the inner sleeve 280 ; or, more than two needle wings are evenly provided in the circumference of the needle core 30 and more than two slots are evenly provided in the circumference of the inner sleeve 280 . The needle wing and the slot can be provided in pairs, and the needle wing and the slot mentioned in the embodiment of the present invention can be understood as the same pair of needle wings and slots.

As shown in FIG10 , the blood collection needle is in a locked state, the inner sleeve 280 abuts against the needle wing 390 to block the launching action of the needle core 30, and as shown in FIG11 , the blood collection needle is in a launching state, the needle wing 390 enters the slot 203 to release the blocking of the needle core 3. The second abutting portion is adapted to move along the guide portion based on the pressing force, so that the slide 20 rotates relative to the housing 10 and generates an axial displacement, driving the needle wing 390 to enter the slot 203/208.

In Fig. 10, the needle wing 390 has not entered the slot 203, and the inner sleeve 280 blocks the needle core 30 from moving toward the blood collection proximal end. In Fig. 11, the needle wing 390 enters the slot 203, and the needle wing 390 can move toward the blood collection proximal end along the slot 203, thus releasing the lock on the needle core 30, and the needle core 30 can perform the firing action.

Alternatively, the embodiments of the present invention may also use other structures to achieve the locking state of the blood collection needle and the firing action of the needle core. For example, a blocking portion is provided on the housing 10 or the slide 20 to block the needle core 30 from moving toward the proximal end of the blood collection. After the needle core 30 staggers the blocking portion by rotation or other movements, the firing action can be performed. The embodiments of the present invention do not limit the specific structure for achieving the locking state of the blood collection needle and the firing action of the needle core.

In an exemplary embodiment of the present invention, as shown in FIG. 1B , a receiving space 180 of the second matching portion is provided on the outer wall of the housing 10 ; and the circumferentially arranged second inclined surface 114 constitutes a partial boundary of the receiving space 180 .

In the above embodiment, when the slide 20 is pressed, the slide 20 rotates relative to the housing 10 and generates an axial displacement (moves toward the distal end of the blood collection), and the second matching portion on the slide 20 also rotates and moves toward the distal end of the blood collection. Therefore, the movement trajectory of the second matching portion relative to the housing 10 is similar to a spiral. In this embodiment, the boundary of the accommodating space 180 is a circumferentially arranged inclined surface, which can better adapt to the movement of the second matching portion.

In an exemplary embodiment of the present invention, as shown in FIG. 3 and FIG. 4 , a needle cap 301 is provided on the needle core 30, and protrusions 302 and 303 are provided on the needle cap 301. As shown in FIG. 2D , a third groove 250 is provided on the inner sleeve 280. In the drawings shown in the embodiment of the present invention, two protrusions are provided on the needle cap 301, and two third grooves are provided on the inner sleeve 280. This is only for illustrative purposes, and the number and specific positions of the protrusions and the third grooves are not limited. For example, one protrusion may be provided on the needle cap 301, and one third groove may be provided on the inner sleeve 280; or, more than two protrusions may be uniformly provided on the circumference of the needle cap 301, and more than two third grooves may be uniformly provided on the circumference of the inner sleeve 280. The protrusion and the third groove may be provided in pairs, and the protrusion and the third groove mentioned in the embodiment of the present invention may be understood as the same pair of protrusions and the third groove.

As shown in FIG3 , the needle cap 301 is in the first state, and the inner sleeve 280 abuts against the protrusions 302 and 303 to prevent the needle cap 301 from being separated from the needle core 30. In FIG3 , 302 is blocked, and in order to more clearly show the protrusions, some components are hidden in FIG3 . The first state mentioned here can be understood as the initial state of the needle cap, the state that is not rotated, or the state that cannot be pulled out.

As shown in FIG4 , the needle cap 301 is in the second state due to the rotational force, and the third groove cooperates with the protrusions 302 and 303, so that the needle cap 301 is separated from the needle core 30. The third groove is not shown in FIG4 , and part of the structure is omitted in FIG4 in order to more clearly show the protrusions 302 and 303. The second state mentioned here can be understood as a state in which the needle cap is rotated into place and can be pulled out.

In this embodiment, the needle cap can be pulled out only when the needle cap is rotated to a suitable position, thus reducing the possibility of false triggering and improving the safety of use.

In an exemplary embodiment of the present invention, based on the separation of the needle cap 301 and the needle core 30, the elastic member 40 drives the needle core 30 to move toward the proximal end of blood collection until the needle core 30 abuts against the inner sleeve 280, and the blood collection needle enters a locked state.

Continuing with the above embodiment, after the needle cap is rotated to a suitable position, the needle cap is pulled out. At this time, as shown in FIG. 12A , the needle core 30 moves toward the proximal end of blood collection until the planes 304 and 305 on the needle wing contact the planes 202 and 207 on the inner sleeve 280 respectively. At this time, as shown in FIG. 12B , the second abutment portions 211 and 212 on the outer wall of the inner sleeve 280 do not contact the guide portions 101 and 108 on the inner wall of the outer shell 10.

When blood sampling is required, the slide cylinder 20 is pressed and moves toward the distal end of the blood sampling, so that the second abutment portions 211 and 212 on the outer wall of the inner sleeve 280 contact the guide portions 101 and 108 on the inner wall of the outer shell 10 respectively, as shown in FIG9 , and then the second abutment portions 211 and 212 move along the guide portions 101 and 108 respectively, performing both rotational motion and axial displacement, as shown in FIGS. 10 and 11 , thereby driving the needle wing 390 into the slot 203/208, and the needle core 30 performs a firing action under the drive of the elastic member 40.

In an exemplary embodiment of the present invention, as shown in FIG. 2C and FIG. 2E , first connecting portions 209 and 210 are provided on the inner wall of the outer sleeve joint portion 290 , and as shown in FIG. 4 , the first connecting portions 209 and 210 are connected to the first matching portions 102 and 109 , respectively.

In the drawings shown in the embodiment of the present invention, two first connection parts are provided on the outer sleeve 290, and two first matching parts are provided on the outer shell 10. This is only for illustration, and the number and specific positions of the first connection parts and the first matching parts are not limited. For example, one first connection part can be provided on the outer sleeve 290, and one first matching part can be provided on the outer shell 10; or, more than two first connection parts are evenly provided in the circumference of the outer sleeve 290, and more than two first matching parts are evenly provided in the circumference of the outer shell 10. The first connection part and the first matching part can be provided in pairs, and the first connection part and the first matching part mentioned in the embodiment of the present invention can be understood as the same pair of first connection part and first matching part.

For example, in one case, the first connection portion is a hanging portion, such as a hook, a hanging platform, etc., and the first matching portion is a transverse rib or a groove, etc., arranged on the radial edge of the shell. The embodiment of the present invention does not limit the specific structure and matching method of the first connection portion and the first matching portion. However, the embodiment of the present invention proposes to design a hanging portion structure facing inward (toward the axial direction) on the slide cylinder, which is simple, compact and very clever.

In an exemplary embodiment of the present invention, as shown in Figures 1C, 1D and 1E, a second connecting portion 105 is provided on one side of the inner wall of the housing 10 close to the distal end of blood collection. As shown in Figure 4, the second connecting portion 105 is suitable for fixing one side of the elastic member 40 close to the distal end of blood collection.

The embodiment of the present invention does not limit the specific structure of the second connection part 105. For example, as shown in FIG1D , the second connection part 105 may be a cylindrical rib, or the top of the cylindrical rib may be provided with an inclined surface, which may be used for guiding, and the cylindrical rib may be provided with a hole or a groove inside.

In FIG4 , the side of the elastic member 40 close to the proximal end of the blood collection is connected to the tail 306 of the needle core 30, and the side close to the distal end of the blood collection is connected to the second connecting portion 105 of the housing 10, so as to facilitate the reset of the elastic member 40 after the needle core is fired. The elastic member 40 can be a spring or other specific elastic component, which is not specifically limited.

In addition, as shown in Figures 1C and 1E, vertical ribs 103, 104, 106 and 107 are provided on the inner wall of the housing 10, wherein the vertical ribs 103 and 104 form a groove 110, and the vertical ribs 106 and 107 form a groove 2 111, and the needle core 30 can move axially in the groove 110 and the groove 2 111.

As shown in FIG2B , the slide cylinder 20 is provided with a through hole 204, and the needle core 30 can be ejected from the through hole 204. The slide cylinder 20 can also be provided with a groove 205, which can limit the movement of the needle cap 301 during the assembly of the blood collection needle, and the edge of the groove 205 can be provided with a bevel, so that the needle cap 301 can be rotated to separate the needle cap 301 from the needle core 30.

The following is a description of a blood collection process using a blood collection needle in a specific implementation manner in conjunction with the above-mentioned drawings:

The appearance of the blood collection needle can be shown in FIG13, including a housing 10, a slide 20, a needle core 30 and other components. As shown in FIG3, the needle cap 301 is in the initial state (first state), and the inner sleeve 280 abuts against the protrusions 302 and 303 (the protrusion 302 is blocked in FIG3) to prevent the needle cap 301 from being separated from the needle core 30.

When the needle cap 301 is rotated on the basis of FIG3 to the state shown in FIG4, the third groove cooperates with the protrusions 302 and 303, so that the needle cap 301 is separated from the needle core 30, or the needle cap 301 is pulled out of the blood collection needle. FIG4 does not show the third groove.

After the needle cap is pulled out, the needle core 30 can move upward in the groove 1 110 and the groove 2 111 of the housing 10, and the groove 1 110 and the groove 2 111 can be shown in FIG1E. After the needle cap is pulled out, the blood collection needle can be shown in FIG12A, and the needle core 30 moves toward the proximal end of the blood collection until the planes 304 and 305 on the needle wing contact with the planes 202 and 207 on the inner sleeve 280. At this time, as shown in FIG12B, the second abutment portions 211 and 212 on the outer wall of the inner sleeve 280 do not contact the guide portions 101 and 108 on the inner wall of the housing 10.

When blood sampling is required, the slide cylinder 20 is pressed and moves toward the distal end of blood sampling, so that the second abutment portions 211 and 212 on the outer wall of the inner sleeve 280 contact the guide portions 101 and 108 on the inner wall of the outer shell 10 respectively, as shown in FIG9 , and then the second abutment portions 211 and 212 move along the guide portions 101 and 108 respectively, performing both rotational motion and axial displacement, as shown in FIGS. 10 and 11 , thereby driving the needle wing 390 into the slot 203/208, and the needle core 30 performs a firing action under the drive of the elastic member 40.

During the process of pressing the slide 20, as shown in Figures 7 and 8, the slide 20 moves toward the distal end of the blood collection, and the elastic arms 201 and 206 retract to the initial state (or the unopened state) after passing over the transverse ribs 102 and 109. In the state shown in Figure 8, the elastic arms 201 and 206 cannot reverse (move toward the proximal end of the blood collection) and pass over the transverse ribs 102 and 109. In other words, the slide 20 can no longer be reset in the reverse direction, and the blood collection needle cannot be reused.

It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims (15)

1. A blood collection needle, comprising: shell; A slide cylinder, the slide cylinder comprises an inner sleeve and an outer sleeve connecting portion, the outer sleeve connecting portion is sleeved on the radial outer side of the inner sleeve, at least a portion of the inner sleeve is arranged inside the outer sleeve, and at least a portion of the outer sleeve connecting portion is arranged on the radial outer side of the outer sleeve; an annular space is formed between the inner sleeve and the outer sleeve connecting portion in the radial direction, and one end of the outer sleeve is located in the annular space; A needle core is arranged in a space defined by the housing and the slide cylinder; An elastic member, disposed in the space defined by the housing and the slide, and adapted to provide power for launching the needle core; Among them, a first matching portion is provided at one end of the shell, and the first matching portion is provided in an annular space and the annular space is suitable for axial movement relative to the first matching portion, and the outer sleeve connecting portion is provided with a second matching portion, and the first matching portion cooperates with the second matching portion to prevent the slide cylinder from returning to its original position after the needle core performs the firing action. 2. The blood collection needle according to claim 1, wherein: The first matching portion allows the second matching portion to pass over the first matching portion from a first direction, while blocking the second matching portion from passing over the first matching portion from a second direction; the first direction is the direction opposite to the launching direction of the needle core, and the second direction is the launching direction of the needle core. 3. The blood collection needle according to claim 2, wherein: The second matching part is an elastic arm, the side of the elastic arm close to the distal end of the blood sampling is fixedly connected to the outer sleeve connection part, and the side close to the proximal end of the blood sampling is inclined toward the inner sleeve; The first matching portion is a transverse rib arranged on a radial edge of the shell. 4. The blood collection needle according to claim 2, wherein: The second matching part is an elastic arm, the side of the elastic arm close to the distal end of the blood sampling is fixedly connected to the outer sleeve connection part, and the side close to the proximal end of the blood sampling is inclined toward the inner sleeve; The first matching portion is a first groove arranged on the housing, and a side wall of the first groove close to the proximal end of the blood sampling block the second matching portion from passing over the first matching portion from the second direction. 5. The blood collection needle according to claim 2, wherein: The second matching part is an elastic arm, the side of the elastic arm close to the proximal end of the blood sampling is fixedly connected to the outer sleeve connecting part, and the side close to the distal end of the blood sampling is provided with a first abutting part; The first matching portion is a transverse rib disposed on a radial edge of the housing, and the transverse rib abuts against the first abutting portion to prevent the second matching portion from passing over the first matching portion from the second direction. 6. The blood collection needle according to claim 2, wherein: The second matching part is an elastic arm, the side of the elastic arm close to the proximal end of the blood sampling is fixedly connected to the outer sleeve connecting part, and the side close to the distal end of the blood sampling is provided with a first abutting part; The first matching portion is a second groove arranged on the shell, and the side wall of the second groove close to the proximal end of the blood collection abuts against the first abutting portion to prevent the second matching portion from passing over the first matching portion from the second direction. 7. The blood collection needle according to claim 1, wherein: A second abutment portion is arranged on the outer wall of the inner sleeve, and a guide portion is arranged on the inner wall of the outer shell. The second abutment portion is adapted to move along the guide portion based on a pressing force to trigger the firing action of the needle core. 8. The blood collection needle according to claim 7, wherein: The needle core is provided with a needle wing, and the inner sleeve is provided with a slot. When the blood collection needle is in a locked state, the inner sleeve abuts against the needle wing to block the launching action of the needle core. When the blood collection needle is in a launching state, the needle wing enters the slot to release the blocking of the needle core. The second abutment portion is suitable for moving along the guide portion based on a pressing force, so that the slide cylinder rotates relative to the housing and generates an axial displacement, driving the needle wing to enter the slot. 9. The blood collection needle according to claim 7 or 8, wherein: The guide portion is a first inclined surface arranged in a circumferential direction, and the second abutment portion is a vertical rib. 10. The blood collection needle according to claim 8, wherein: An accommodating space for the second matching portion is arranged on the outer wall of the shell; and a second inclined surface arranged circumferentially constitutes a partial boundary of the accommodating space. 11. The blood collection needle according to claim 1, wherein: The needle core is provided with a needle cap, the needle cap is provided with a convex portion, and the inner sleeve is provided with a third groove; When the needle cap is in the first state, the inner sleeve abuts against the raised portion to prevent the needle cap from being separated from the needle core; when the needle cap is in the second state due to the rotational force, the third groove cooperates with the raised portion to separate the needle cap from the needle core. 12. The blood collection needle according to claim 11, wherein: Based on the separation of the needle cap and the needle core, the elastic member drives the needle core to move toward the proximal end of blood collection until the needle core abuts against the inner sleeve, and the blood collection needle enters a locked state. 13. The blood collection needle according to claim 1, wherein: A first connecting portion is disposed on the inner wall of the outer sleeve connecting portion, and the first connecting portion is connected to the first matching portion. 14. The blood collection needle according to claim 13, wherein: The first connecting portion is a hanging portion, and the first matching portion is a transverse rib arranged on a radial edge of the shell. 15. The blood collection needle according to claim 1, wherein: A second connecting portion is provided on one side of the inner wall of the shell close to the distal end of the blood sampling, and the second connecting portion is suitable for fixing one side of the elastic member close to the distal end of the blood sampling.