CN115868988A

CN115868988A - Blood taking needle

Info

Publication number: CN115868988A
Application number: CN202111140609.5A
Authority: CN
Inventors: 张立波; 崔成哲
Original assignee: Tianjin Huahong Technology Co Ltd
Current assignee: Tianjin Huahong Technology Co Ltd
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2023-03-31

Abstract

The embodiment of the invention provides a blood taking needle, wherein a shell of the blood taking needle is provided with a first matching part, a sliding barrel is provided with a second matching part, and the first matching part is matched with the second matching part so as to prevent the sliding barrel from returning to an original position after a needle core performs a launching action. The needle core carries out the transmission action and also the blood sampling action is carried out to the blood taking needle, and it is thus clear that in this scheme, after the blood taking needle carries out blood sampling once, the sliding tube can not reset, and this blood taking needle just can not used repeatedly like this, and blood taking needle used repeatedly's problem has been solved to this scheme.

Description

Blood taking needle

Technical Field

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

Background

A lancet is an instrument for collecting blood samples during medical examination. Blood taking needles generally comprise a housing, a slide, a core and an elastic member, and the use process generally comprises: by pressing the slide, the stylet is moved into position and fired under the drive of the resilient member.

Blood taking needles are disposable products, but some bad users can repeatedly use the blood taking needles in order to save cost, so that great medical risks are caused.

Disclosure of Invention

An object of an embodiment of the present invention is to provide a lancet to solve the problem of reuse of the lancet.

To achieve the above object, an embodiment of the present invention provides a lancet, including:

a housing;

a slide cylinder; the sliding cylinder comprises an inner sleeve and an outer sleeved part, the outer sleeved part is sleeved on the radial outer side of the inner sleeve, at least one part of the inner sleeve is arranged in the outer shell, and at least one part of the outer sleeved part is arranged on the radial outer side of the outer shell;

a needle core disposed in a space defined by the housing and the slide;

an elastic member disposed in a space defined by the housing and the slide, adapted to provide power for firing the stylet;

the outer shell is provided with a first matching part, the outer sleeving part is provided with a second matching part, and the first matching part is matched with the second matching part so as to prevent the sliding cylinder from returning to the original position after the needle core executes the launching action.

Optionally, the first mating portion allows the second mating portion to pass the first mating portion from the first direction, and blocks the second mating portion from passing the first mating portion from the second direction; the first direction is a direction opposite to a firing direction of the stylet, and the second direction is the firing direction of the stylet.

Optionally, the second matching portion is an elastic arm, one side of the elastic arm close to the blood sampling far end is fixedly connected with the outer sleeve connecting portion, and one side close to the blood sampling near end is inclined towards the inner sleeve;

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

Optionally, the second matching portion is an elastic arm, one side of the elastic arm close to the blood collection distal end is fixedly connected with the outer sleeve portion, and one side close to the blood collection proximal end is inclined towards the inner sleeve;

the first matching part is a first groove arranged on the shell, and the side wall of the first groove close to one side of the blood sampling near end blocks the second matching part from crossing the first matching part from the second direction.

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

the first matching portion is a transverse rib arranged on the radial edge of the shell, and the transverse rib is abutted against the first abutting portion to prevent the second matching portion from crossing the first matching portion from the second direction.

Optionally, the second matching portion is an elastic arm, one side of the elastic arm close to the blood sampling near end is fixedly connected with the outer sleeve portion, and one side close to the blood sampling far end is provided with a first abutting portion;

the first matching part is a second groove arranged on the shell, and the side wall of the second groove close to one side of the blood sampling near end is abutted against the first abutting part so as to prevent the second matching part from crossing the first matching part from the second direction.

Optionally, the outer wall of the inner sleeve is provided with a second abutting portion, the inner wall of the outer shell is provided with a guide portion, and the second abutting portion is suitable for moving along the guide portion based on pressing acting force so as to trigger the emission action of the stylet.

Optionally, the stylet is provided with a needle wing, the inner sleeve is provided with a slot, the inner sleeve abuts against the needle wing when the blood taking needle is in a locked state to block the firing action of the stylet, and the needle wing enters the slot to release the blocking of the stylet when the blood taking needle is in a firing state;

the second abutting portion is suitable for moving along the guide portion based on pressing acting force, so that the sliding cylinder generates axial displacement while rotating relative to the shell, and the needle wing is driven to enter the slot.

Optionally, the guide portion is a first inclined plane arranged in the circumferential direction, and the second abutting portion is a vertical rib.

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

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

when the needle cap is in a first state, the inner sleeve is abutted to the convex part so as to prevent the needle cap from being separated from the needle core; the needle cap is in a second state based on the rotation acting force, and the third groove is matched with the bulge part, so that the needle cap is separated 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 towards the proximal blood sampling end until the needle core abuts against the inner sleeve, and the blood sampling needle enters a locking state.

Optionally, a first connecting portion is arranged on an inner wall of the outer connecting portion, and the first connecting portion is connected with the first matching portion.

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

Optionally, a second connecting portion is disposed on one side of the inner wall of the housing, which is close to the blood collection distal end, and the second connecting portion is adapted to fix one side of the elastic member, which is close to the blood collection distal end.

By applying the embodiment of the invention, the shell is provided with the first matching part, the sliding cylinder is provided with the second matching part, and the first matching part is matched with the second matching part so as to prevent the sliding cylinder from returning to the original position after the needle core executes the launching action. The needle core carries out the transmission action and also the blood sampling action is carried out to the blood taking needle, and it is thus clear that in this scheme, after the blood taking needle carries out blood sampling once, the sliding tube can not reset, and this blood taking needle just can not used repeatedly like this, and blood taking needle used repeatedly's problem has been solved to this scheme.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1A to fig. 1E are schematic structural diagrams of a housing according to an embodiment of the present invention;

fig. 2A to fig. 2E are schematic structural diagrams of a slide cartridge according to an embodiment of the present invention;

FIGS. 3 and 4 are schematic views of the position of the raised portion in the core at different angles of rotation of the core as provided by an exemplary embodiment of the present invention;

fig. 5-8 are schematic views of the engagement between the transverse ribs and the elastic arms at different viewing angles and different states according to the exemplary embodiment of the present invention;

fig. 9 is a schematic view of a fitting relationship between a second abutting portion and a guiding portion according to an embodiment of the present invention;

FIGS. 10 and 11 are schematic views of different positional relationships of the wings and slots provided by an exemplary embodiment of the present invention;

FIGS. 12A and 12B are schematic views illustrating the internal structure of the lancet after the needle cap is removed from the lancet according to different viewing angles in accordance with the exemplary embodiment of the present invention;

FIG. 13 is a schematic view of the entire outer appearance of a lancet provided in accordance with an embodiment of the present invention;

fig. 14 is a schematic structural view of another second matching portion according to an embodiment of the present invention;

fig. 15-16 are schematic views illustrating the engagement between the transverse ribs and the elastic arms in different viewing angles according to another embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived from the embodiments given herein by one of ordinary skill in the art, are within the scope of the invention.

In order to achieve the above objects, embodiments of the present invention provide a lancet, which is described below with reference to fig. 1A to 16.

The lancet includes a housing 10, a slide cylinder 20, a needle core 30, and an elastic member 40. Fig. 1A-1E are schematic structural views of a housing 10 in an exemplary embodiment of the invention. Fig. 2A-2D are schematic structural views of a slide cartridge 20 in an exemplary embodiment of the invention.

As shown in fig. 2A, 2B, 2D, and 2E, the slide cartridge 20 includes an inner sleeve 280 and an outer spigot 290, the outer spigot 290 being sleeved on a 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 contacting portion 290 is disposed radially outside the outer shell 10.

As shown in fig. 3, a needle core 30 disposed in a space defined by the housing 10 and the slide cylinder 20; a resilient member 40, disposed in the space defined by the housing 10 and the slide 20, is adapted to power the firing core 30.

As shown in fig. 1A and 1B, the housing 10 is provided with first engaging

portions

102 and 109, and as shown in fig. 2A, 2C and 2E, the outer attaching portion 290 is provided with second

engaging portions

201 and 206 with which the first engaging portions engage to prevent the slide barrel 20 from returning to the home position after the needle core 30 performs the firing action.

In the drawings illustrating the embodiments of the present invention, two first engagement portions are provided on the housing 10, and two second engagement portions are provided on the outer connection portion 290, which are merely for illustration and do not limit the number and specific positions of the first engagement portions and the second engagement portions. For example, a first mating portion may be provided on the housing 10, and a second mating portion may be provided on the outer coupling portion 290; alternatively, two or more first engagement portions are uniformly provided in the circumferential direction of the housing 10, and two or more second engagement portions are uniformly provided in the circumferential direction of the outer sleeve 290. The first matching part and the second matching part can be arranged in pairs, and the first matching part and the second matching part mentioned in the embodiment of the invention can be understood as the same pair of matching parts.

In an exemplary embodiment of the invention, the first fitting portion allows the second fitting portion to pass over the first fitting portion from a first direction, while blocking the second fitting portion from passing over the first fitting portion from a second direction; the first direction is a direction opposite to a firing direction of the stylet, and the second direction is the firing direction of the stylet.

In some cases, the slide is pressed during use of the lancet, usually in the opposite direction to the firing direction of the core. In this embodiment, the second engaging portion can pass over the first engaging portion in the direction opposite to the direction of the ejection of the core, but cannot be reversely reset, so that the slide cylinder can be normally pressed without affecting the use of the lancet, but the slide cylinder cannot return to the original position after the slide cylinder is pressed, and thus the lancet cannot be reused.

With regard to the structure and the fitting form of the first fitting portion and the second fitting portion, various solutions are provided in the following.

In a first embodiment, as shown in fig. 2A, the second engaging portion 201 is an elastic arm, one side of the elastic arm near the distal end of blood collection is fixedly connected to the outer sleeve portion 290, and one side of the elastic arm near the proximal end of blood collection is inclined toward the inner sleeve 280;

as shown in fig. 1A and 1B, the first

fitting portions

102 and 109 are transverse ribs provided at the radial edges of the housing 10.

The proximal blood collection end in the embodiment of the present invention may be understood as an end close to the blood collection site, and the distal blood collection end in the embodiment of the present invention may be understood as an end far from the blood collection site.

The engagement between the transverse bar and the resilient arm can be seen in fig. 5 and 6, and parts of the transverse bar and the resilient arm are hidden in fig. 5 and 6 to show the engagement between the transverse bar and the resilient arm more clearly. The needle cap of the needle core 30 is not pulled out in fig. 5, and in fig. 5, the side of the elastic arm 206 near the distal end of the blood collection is fixedly connected to the outer connecting portion 290, and the side near the proximal end of the blood collection is inclined toward the inner case 280. In the state shown in fig. 5, if the slide cylinder 20 is moved toward the blood collection distal end, the

elastic arms

201 and 206 are expanded outward or opened away from the axis by the

transverse ribs

102 and 109 as shown in fig. 6.

The engagement between the transverse bar and the resilient arm will now be described from the perspective of a cross-sectional view in conjunction with fig. 7 and 8. Both fig. 7 and 8 show the cap removed, with fig. 7 being understood as the condition before firing of the core and fig. 8 being understood as the condition after firing of the core. In fig. 7, the

elastic arms

201 and 206 are fixedly connected to the outer connecting portion 290 at the side near the distal end of blood collection, and are inclined toward the inner case 280 at the side near the proximal end of blood collection. In the state shown in fig. 7, if the slide cylinder 20 is moved toward the distal end of blood collection, the

elastic arms

201 and 206 are expanded outward or opened away from the axis by the

transverse ribs

102 and 109. As shown in fig. 8, the

elastic arms

201 and 206 are retracted to the initial state (or unopened state) after passing over the

transverse ribs

102 and 109, and in the state shown in fig. 8, the

elastic arms

201 and 206 cannot reversely (move towards the proximal end of blood collection) pass over the

transverse ribs

102 and 109, that is, the slide cartridge 20 cannot be reversely reset, and the blood collection needle cannot be reused.

In the second scheme, the second matching part is an elastic arm, one side of the elastic arm close to the far end of blood collection is fixedly connected with the outer sleeve part, and one side close to the near end of blood collection inclines towards the inner sleeve;

the first matching part is a first groove arranged on the shell, and the side wall of the first groove close to one side of the blood sampling near end blocks the second matching part from passing through the first matching part from the second direction.

The difference between the second scheme and the first scheme is that in the first scheme, the first matching portion is a transverse rib, and in the second scheme, the first matching portion is a groove.

Third, as shown in fig. 14 to 16, the second matching portions are

elastic arms

213 and 214, one sides of the

elastic arms

213 and 214 close to the proximal end of blood collection are fixedly connected with the outer sleeve 290 portion, and one side close to the distal end of blood collection is provided with a first abutting portion;

the first mating portions are

transverse ribs

102 and 109 disposed at the radial edge of the housing, and the transverse ribs abut against the first abutting portions to block the second mating portions from crossing the first mating portions in the second direction.

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

The engagement between the transverse bar and the resilient arm can be seen in fig. 15 and 16, but in fig. 15 and 16, some parts are hidden to show the engagement between the transverse bar and the resilient arm more clearly. In fig. 15, the needle cap of the needle core 30 is not pulled out, and in fig. 15, the side of the elastic arm 214 near the proximal end of the blood collection tube is fixedly connected to the outer connecting part 290. In the state shown in fig. 15, if the slide cylinder 20 moves toward the distal end of blood collection, the elastic arm 214 passes over the transverse rib 109 as shown in fig. 16, but the elastic arm 214 cannot move in the reverse direction (toward the proximal end of blood collection) any more over the transverse rib 109 due to the first contact portion.

The difference between the third scheme and the first scheme is the structure of the elastic arm, in the first scheme, one side of the elastic arm close to the far end of blood collection is fixed, the other side of the elastic arm inclines towards the inner sleeve, in the third scheme, one side of the elastic arm close to the near end of blood collection is fixed, and the other side of the elastic arm is provided with a butting part.

According to the fourth scheme, the second matching part is an elastic arm, one side of the elastic arm, which is close to the blood sampling near end, is fixedly connected with the outer sleeving part, and one side of the elastic arm, which is close to the blood sampling far end, is provided with a first abutting part;

The difference between the fourth scheme and the third scheme is that in the third scheme, the first matching parts are transverse ribs, and in the fourth scheme, the first matching parts are grooves.

In an exemplary embodiment of the present invention, as shown in fig. 2C and 2D, the inner sleeve 280 is provided on the outer wall thereof with the second abutting

portions

211 and 212, and as shown in fig. 1B, 1C and 1D, the inner wall of the outer housing 10 is provided with the

guide portions

101 and 108. In the drawings of the embodiment of the present invention, two guide portions are disposed on the outer shell 10, and two second abutting portions are disposed on the inner sleeve 280, which are merely for illustration and do not limit the number and specific positions of the guide portions and the second abutting portions. For example, the housing 10 may be provided with a guide portion, and the inner sleeve 280 may be provided with a second abutting portion; alternatively, two or more guide portions are provided uniformly in the circumferential direction of the housing 10, and two or more second abutting portions are provided uniformly in the circumferential direction of the inner sleeve 280. The guide portion and the second abutting portion may be provided in a pair, and the guide portion and the second abutting portion mentioned in the embodiment of the present invention may be understood as the same pair of the guide portion and the second abutting portion.

As shown in fig. 9 and 12B, the second abutment 211 is adapted to move along the guide 101 based on the 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 disposed circumferentially, and the second abutting portion is a vertical rib. Thus, when the second contact portion moves along the guide portion, both rotational movement and axial displacement occur. Alternatively, in other cases, the guiding portion may be a groove, and the second abutting portion may be a protrusion, which cooperate to generate both the circumferential displacement and the axial displacement. The embodiment of the present invention does not limit the specific structures of the guide portion and the second abutting portion.

In an exemplary embodiment of the invention, as shown in fig. 7, the core 30 is provided with a

needle wing

390, and 304 and 305 shown in fig. 4 can be understood as the faces in the needle wing 390. As shown in fig. 2B, 2C, 2D, and 2E, the inner sleeve 280 is provided with

slots

203 and 208. In the drawings of 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, which are only for illustration and do not limit the number and specific positions of the needle wings and the slots. For example, the stylet 30 can be provided with a needle wing, and the inner sleeve 280 can be provided with a slot; alternatively, two or more needle wings are uniformly provided in the circumferential direction of the needle core 30, and two or more slots are uniformly provided in the circumferential direction of the inner sleeve 280. The wings and slots may be arranged in pairs and reference to a wing and a slot in embodiments of the invention is to be understood to mean the same pair of wing and slot.

As shown in fig. 10, when the lancet is in the locked state, the inner case 280 is in contact with the needle wing 390 to block the shooting operation of the core 30, and as shown in fig. 11, when the lancet is in the shooting state, the needle wing 390 enters the slit 203 to release the blocking of the core 3. The second abutting portion is adapted to move along the guide portion based on the pressing force, so that the slide cylinder 20 is axially displaced while rotating relative to the housing 10, and the needle wing 390 is driven into the slot 203/208.

In fig. 10, the needle wings 390 do not enter the slots 203 and the inner sleeve 280 blocks the movement of the needle core 30 toward the proximal end of the blood collection. In fig. 11, the needle wing 390 enters the slot 203, and the needle wing 390 can move toward the proximal end of the blood collection along the slot 203, so that the locking of the needle core 30 is released and the needle core 30 can perform a firing action.

Alternatively, the embodiment of the present invention may adopt other structures to realize the locking state of the lancet and the ejecting operation of the needle core, for example, a blocking portion may be provided in the housing 10 or the slide cylinder 20 to block the needle core 30 from moving toward the proximal end of the lancet, and the ejecting operation may be performed after the needle core 30 is shifted from the blocking portion by rotation or other movement. The embodiment of the present invention does not limit the specific structure for realizing the locking state of the blood collection needle and the launching action of the needle core.

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

In the above-described embodiment, when the slide cylinder 20 is pressed, the slide cylinder 20 is axially displaced (moved toward the distal end of blood collection) while rotating with respect to the housing 10, and the second engagement portion on the slide cylinder 20 is also moved toward the distal end of blood collection while rotating, so that the movement locus of the second engagement portion with respect to the housing 10 is similar to a spiral shape. In this embodiment, the receiving space 180 is bounded by a circumferentially arranged ramp, which better accommodates the movement of the second mating portion.

In an exemplary embodiment of the present invention, as shown in fig. 3 and 4, the needle core 30 is provided with a needle cap 301, the needle cap 301 is provided with

protrusions

302 and 303, and as shown in fig. 2D, the inner sleeve 280 is provided with a third groove 250. In the drawings showing the embodiments of the present invention, two protrusions are provided on the needle cap 301, and two third grooves are provided on the inner sleeve 280, which are only for illustration and do not limit the number and specific positions of the protrusions and the third grooves. For example, the needle cap 301 may have a protrusion, and the inner sleeve 280 may have a third groove; alternatively, two or more protrusions are uniformly provided in the circumferential direction of the needle cap 301, and two or more third grooves are uniformly provided in the circumferential direction of the inner sleeve 280. The protruding part and the third groove may be provided in pairs, and the protruding part and the third groove mentioned in the embodiments of the present invention may be understood as the same pair of the protruding part and the third groove.

As shown in FIG. 3, the needle cap 301 is in the first state, the inner sleeve 280 abuts against the

protrusions

302 and 303 to block the needle cap 301 from being detached from the needle core 30. 302 is obscured in fig. 3, and parts of the components are hidden in fig. 3 to more clearly show the boss. The first state referred to herein is understood to mean an initial state of the needle cap, a state in which the needle cap is not rotated, or a state in which the needle cap cannot be pulled out.

As shown in fig. 4, the needle cap 301 is in the second state based on the rotational force, and the third groove is engaged with the

protrusions

302 and 303, so that the needle cap 301 is disengaged from the core needle 30. The third groove is not shown in fig. 4, and a part of the structure is omitted in fig. 4 in order to show the

bosses

302 and 303 more clearly. The second state is a state in which the cap is rotated to a position where the cap can be pulled out.

In this embodiment, the needle cap can be pulled out only by rotating the needle cap to a proper position. Therefore, the condition of false triggering is reduced, and the use safety is improved.

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

Continuing with the above embodiment, after the needle cap is rotated to a proper position, the needle cap is withdrawn, and at this time, as shown in fig. 12A, the hub 30 is moved toward the proximal end of the blood collection until the

flat surfaces

304 and 305 on the needle wing come into contact with the

flat surfaces

202 and 207 on the inner sleeve 280, respectively, and at this time, as shown in fig. 12B, the second abutting

portions

211 and 212 on the outer wall of the inner sleeve 280 do not come into contact with the

guide portions

101 and 108 on the inner wall of the housing 10.

When blood collection is required, the sliding barrel 20 is pressed, the sliding barrel 20 moves towards the distal blood collection end, so that the second abutting

parts

211 and 212 on the outer wall of the inner sleeve 280 are respectively contacted with the

guide parts

101 and 108 on the inner wall of the outer shell 10, as shown in fig. 9, and then the second abutting

parts

211 and 212 respectively move along the

guide parts

101 and 108, and perform both rotary motion and axial displacement, as shown in fig. 10 and 11, so that the needle wing 390 is driven to enter the slot 203/208, and the needle core 30 performs a launching action under the driving of the elastic part 40.

In an exemplary embodiment of the present invention, as shown in fig. 2C and 2E, the outer connecting portion 290 is provided with first connecting

portions

209 and 210 on an inner wall thereof, and as shown in fig. 4, the first connecting

portions

209 and 210 are connected to the

first mating portions

102 and 109, respectively.

In the drawings illustrating the embodiments of the present invention, two first connecting portions are provided on the outer connecting portion 290, and two first mating portions are provided on the housing 10, which are merely for illustration and do not limit the number and specific positions of the first connecting portions and the first mating portions. For example, the outer coupling portion 290 may be provided with a first coupling portion, and the housing 10 may be provided with a first mating portion; alternatively, two or more first connecting portions are uniformly provided in the circumferential direction of the outer sleeve 290, and two or more first engaging portions are uniformly provided in the circumferential direction of the housing 10. The first connecting portion and the first matching portion may be disposed in pairs, and the first connecting portion and the first matching portion mentioned in the embodiment of the present invention may be understood as the same pair of the first connecting portion and the first matching portion.

For example, in one aspect, the first connecting portion is a hanging portion, such as a hook, a hanging platform, or the like, and the first mating portion is a transverse rib or a groove, or the like, disposed at a radial edge of the housing. The embodiment of the present invention does not limit the specific structure and the matching manner of the first connecting portion and the first matching portion. However, the embodiment of the invention provides a hanging part structure which is designed on the sliding cylinder and faces towards the inner side (towards the axial direction), and the structure is simple, compact and ingenious.

In an exemplary embodiment of the present invention, as shown in fig. 1C, 1D and 1E, a second connecting portion 105 is provided in the inner wall of the housing 10 on a side near the distal end of blood collection, and as shown in fig. 4, the second connecting portion 105 is adapted to fix a side of the elastic member 40 near the distal end of blood collection.

The embodiment of the present invention does not limit the specific structure of the second connection portion 105. For example, as shown in fig. 1D, the second connecting portion 105 may be a cylindrical rib, or the top of the cylindrical rib may be provided with a slope, the slope may be used for guiding, and the cylindrical rib may be provided with a hole or a groove inside.

In fig. 4, the side of the elastic member 40 near the proximal end of the lancet is connected to the tail 306 of the core 30, and the side near the distal end of the lancet is connected to the second connecting portion 105 of the housing 10, so that the elastic member 40 is easily restored after the core is fired. The elastic member 40 may be a spring or other elastic member, and is not limited in particular.

Further, as shown in fig. 1C and 1E, the inner wall of the housing 10 is provided with

vertical ribs

103, 104, 106 and 107, wherein the

vertical ribs

103 and 104 form a first groove 110, the

vertical ribs

106 and 107 form a second groove 111, and the needle core 30 can axially move in the first groove 110 and the second groove 111.

As shown in FIG. 2B, the slide 20 is provided with a through hole 204, and the needle core 30 can be ejected out of the through hole 204. The slide cylinder 20 may be further provided with a groove 205, the groove 205 may limit the movement of the needle cap 301 during the assembly of the lancet, and the edge of the groove 205 may be provided with a slope, which facilitates the rotation of the needle cap 301 to disengage the needle cap 301 from the core 30.

The blood taking process of the blood taking needle in a specific embodiment is described in the following with reference to the attached drawings:

the lancet may have an external appearance as shown in fig. 13, and include a housing 10, a slide cylinder 20, a needle core 30, and the like. As shown in fig. 3, the needle cap 301 is in the initial state (first state), the inner sleeve 280 abuts against the protrusions 302 and 303 (the protrusion 302 is shielded in fig. 3) to block the needle cap 301 from being detached from the needle core 30.

When the cap 301 is rotated on the basis of fig. 3 to the state shown in fig. 4, the third groove is engaged with the

protrusions

302 and 303, so that the cap 301 is disengaged from the core 30, or the cap 301 is pulled out from the blood collection needle. The third recess is not shown in fig. 4.

After the needle cap is removed, the needle core 30 can move upward in the first groove 110 and the second groove 111 of the housing 10, and the first groove 110 and the second groove 111 can be as shown in fig. 1E. After the cap is removed, the lancet can be moved toward the proximal end of the lancet as shown in fig. 12A until the

flat surfaces

304 and 305 of the needle wing are in contact with the

flat surfaces

202 and 207 of the inner housing 280, at which time the

second abutment portions

211 and 212 of the outer wall of the inner housing 280 are not in contact with the

guide portions

101 and 108 of the inner wall of the housing 10 as shown in fig. 12B.

parts

guide parts

parts

211 and 212 respectively move along the

guide parts

In the process of pressing the slide cartridge 20, as shown in fig. 7 and 8, the slide cartridge 20 moves towards the distal end of blood collection, and the

elastic arms

transverse ribs

102 and 109, in the state shown in fig. 8, the

elastic arms

transverse ribs

102 and 109, that is, the slide cartridge 20 cannot be reversely reset any more, and the blood collection needle cannot be reused.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. A blood collection needle comprising:

a housing;

a needle core disposed in a space defined by the housing and the slide;

2. The lancet of claim 1, wherein:

the first matching part allows the second matching part to cross the first matching part from a first direction, and blocks the second matching part from crossing the first matching part from a second direction; the first direction is a direction opposite to a firing direction of the stylet, and the second direction is the firing direction of the stylet.

3. The blood collection needle according to claim 2, wherein:

the second matching part is an elastic arm, one side of the elastic arm close to the far end of blood collection is fixedly connected with the outer sleeve part, and one side close to the near end of blood collection inclines towards the inner sleeve;

4. The lancet of claim 2, wherein:

the first matching part is a first groove arranged on the shell, and the side wall of the first groove close to one side of the blood sampling near end blocks the second matching part to cross the first matching part from the second direction.

5. The blood collection needle according to claim 2, wherein:

the second matching part is an elastic arm, one side of the elastic arm close to the blood sampling near end is fixedly connected with the outer sleeved part, and one side close to the blood sampling far end is provided with a first abutting part;

6. The blood collection needle according to claim 2, wherein:

the second matching part is an elastic arm, one side of the elastic arm close to the blood sampling near end is fixedly connected with the outer sleeve part, and one side close to the blood sampling far end is provided with a first abutting part;

7. The lancet of claim 1, wherein:

the outer wall of the inner sleeve is provided with a second abutting part, the inner wall of the outer shell is provided with a guide part, and the second abutting part is suitable for moving along the guide part based on pressing acting force so as to trigger the emission action of the needle core.

8. The blood collection needle according to claim 7, wherein:

the needle core is provided with a needle wing, the inner sleeve is provided with a slot, the inner sleeve is abutted against the needle wing when the blood taking needle is in a locking state so as to block the launching action of the needle core, and the needle wing enters the slot when the blood taking needle is in a launching state so as to relieve the blocking of the needle core;

9. The blood lancet of claim 7 or 8, wherein:

the guide part is a first inclined plane which is circumferentially arranged, and the second abutting part is a vertical rib.

10. The blood collection needle of claim 8, wherein:

the outer wall of the shell is provided with an accommodating space of the second matching part; the second inclined surface arranged circumferentially constitutes a partial boundary of the accommodation space.

11. The blood collection needle according to claim 1, wherein:

a needle cap is arranged on the needle core, a convex part is arranged on the needle cap, and a third groove is arranged on the inner sleeve;

12. The blood collection needle of claim 11, wherein:

based on the separation of the needle cap and the needle core, the elastic piece drives the needle core to move towards the blood sampling near end until the needle core is abutted against the inner sleeve, and the blood sampling needle enters a locking state.

13. The blood collection needle according to claim 1, wherein:

the inner wall of the outer sleeved part is provided with a first connecting part, and the first connecting part is connected with the first matching part.

14. The blood collection needle of claim 13, wherein:

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

15. The blood collection needle according to claim 1, wherein:

and a second connecting part is arranged on one side of the inner wall of the shell, which is close to the blood sampling far end, and the second connecting part is suitable for fixing one side of the elastic part, which is close to the blood sampling far end.