CN113925507A

CN113925507A - A disposable peripheral blood collection needle

Info

Publication number: CN113925507A
Application number: CN202010667628.2A
Authority: CN
Inventors: 丁存林
Original assignee: Jiangsu Kangjian Medical Apparatus Co ltd
Current assignee: Jiangsu Kangjian Medical Apparatus Co ltd
Priority date: 2020-07-13
Filing date: 2020-07-13
Publication date: 2022-01-14
Anticipated expiration: 2040-07-13
Also published as: CN113925507B

Abstract

The invention discloses a disposable peripheral blood taking needle, relating to the technical field of medical equipment, which comprises a shell, a first elastic part, a needle assembly provided with a puncture needle and a second elastic part, wherein the shell is provided with a first cavity, one end of the shell is provided with a perforation, a first channel is formed in the first cavity, a sliding sleeve is arranged at the position of the first cavity and is in sliding connection with the first channel, a second cavity is arranged in the sliding sleeve, a second channel provided with a needle outlet is formed in the second cavity, the needle outlet of the second channel is aligned with the perforation, one end of the sliding sleeve penetrates through the perforation, the first elastic part is arranged at the position of the second cavity, the first end and the second end of the needle assembly are arranged on the needle assembly, the first end of the needle assembly is sleeved with the first elastic part, the needle assembly is in sliding connection with the second channel, the puncture needle is aligned with the needle outlet of the second channel, compared with the prior art, the invention has compact structure, the safety is high, and the needle assembly can stably slide in the inner cavity of the shell, so that the trauma to a patient is reduced to the maximum extent.

Description

Disposable tip blood taking needle

Technical Field

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

Background

With the rapid development of the medical field, the blood sampling technology is mature, in the clinical medicine, in order to reduce the pain of a patient when the patient is subjected to blood sampling as much as possible, the blood sampling mode and the blood sampling amount are greatly different for different diseases, and blood of one or even a plurality of test tubes is not extracted from the patient to test in the process of micro blood sampling in clinical examination, but blood sampling is performed on the skin tip of a human body through micro-wound lacerations.

The existing blood taking needle comprises a needle component, a shell, an elastic mechanism and the like, the existing needle component generally comprises an inner sleeve movably connected with the shell and a steel needle connected with the inner sleeve, the inner sleeve is used for positioning the exposed length of the steel needle and ensuring the stable skin penetration depth, wherein the traditional blood taking needle is not compact in structure and cannot stably run in the running process, the needle component is easy to shake in the moving process, the wound area of a patient can be increased, some blood taking needles are not provided with a protection system, the steel needle on the spring pushing needle component pierces the skin, but in the rebounding process of the spring, the blood taking needle can secondarily pierce the skin to bring unnecessary wounds, the problem that the sealing performance of some blood taking needles is poor when the blood taking needles are not used still exists, the puncture needle is easy to be polluted, and the life of the patient is damaged.

Therefore, the invention discloses a disposable peripheral blood taking needle, which has compact structure and high safety compared with the prior art, and the needle assembly can stably slide in the inner cavity of the shell, thereby reducing the trauma to a patient to the maximum extent.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a disposable peripheral blood taking needle, compared with the prior art, the disposable peripheral blood taking needle has compact structure and high safety, and the needle assembly can stably slide in the inner cavity of the casing, so that the wound of a patient is reduced to the maximum extent.

The invention is realized by the following technical scheme: a disposable peripheral blood taking needle comprises a shell, a sliding sleeve, a first elastic part, a needle assembly provided with a puncture needle and a second elastic part, wherein the shell is provided with a first cavity, one end of the shell is provided with a perforation, a first channel is formed in the first cavity, the sliding sleeve is arranged at the position of the first cavity and is in sliding connection with the first channel, the sliding sleeve is provided with a second cavity, a second channel provided with a needle outlet is formed in the second cavity, the needle outlet of the second channel is aligned with the perforation, one end of the sliding sleeve penetrates through the perforation, the first elastic part is arranged at the position of the second cavity, the needle assembly is provided with a first end and a second end, the first end of the needle assembly is sleeved with the first elastic part and is in sliding connection with the second channel, the puncture needle is aligned with the needle outlet of the second channel, the second elastic part is arranged at the position of the second end of the needle assembly in sleeved connection, and at least two first limiting blocks are fixedly arranged on the surface of the needle assembly, the fixed two first spacing arms that are provided with of one end that keep away from the needle outlet of sliding sleeve, the slide rail has been seted up on first spacing arm surface, the one end that first spacing arm contactless sliding sleeve is provided with the inclined plane of crooked to first cavity inner wall direction and forms uncovered, first spacing arm inclined plane position department is provided with first spacing groove, first cavity is close to the open one end of first spacing arm and is provided with the lug, first stopper accomplishes spacing to the needle subassembly with the cooperation of first spacing groove, exert force to the sliding sleeve, when making the sliding sleeve move to the direction that is close to the lug in first passageway, lug contact extrusion spacing arm upper slope, the inclined plane is crooked to first cavity inner wall direction, open size grow, first stopper contactless first spacing groove this moment, the needle subassembly moves to needle outlet one end in the second passageway under the effect of second elastic component.

For the invention, when the needle is not used, part of the structure of the sliding sleeve penetrates through the through hole and extends to the outside of the first cavity, at the moment, the first limiting block is arranged at the position of the first limiting groove, the second elastic piece supports against the needle assembly, the first limiting block and the first limiting groove can be matched in a buckling mode, so that the needle assembly is prevented from moving to the position of the needle outlet along the second channel, when the blood taking needle of the invention is needed, the sliding sleeve extending outside the first cavity is contacted and pressed with the position of skin needing blood taking, the sliding sleeve moves in the first channel in the direction close to the lug until the lug is contacted and pressed with the upper inclined plane of the limiting arm, at the moment, the inclined plane bends towards the inner wall of the first cavity, the size of the opening is increased, at the moment, the first limiting block is not contacted with the first limiting groove, the needle assembly moves towards one end of the needle outlet in the second channel under the action of the second elastic piece, the puncture needle rapidly penetrates through the needle outlet and the perforation under the action of thrust to puncture the skin, wherein the exposed tip length of the puncture needle on the needle assembly is controlled to be 1.6-2.2mm, so that the skin puncture depth is ensured to be stable, the epidermis is punctured and the puncture needle does not penetrate into subcutaneous tissues, no strong pain is caused, in the process of puncturing the skin, the needle assembly presses the first elastic element arranged at the second channel position, because the potential energy applied by the second elastic element is greater than the maximum storable potential energy of the first elastic element, the first elastic element is completely compressed under the action of the force applied by the second elastic element, the second elastic element is elongated by the needle assembly moving due to inertia in the process, after the second elastic element moves to the farthest distance, the second elastic element and the first elastic element apply the force in the same direction to the needle assembly, so that the puncture needle rapidly contracts into the first cavity, the needle assembly is embedded into the sliding rail on the surface of the first limiting arm in the process that the needle assembly moves towards one end of the needle outlet in the second channel under the action of the second elastic piece, so that the stability of the moving process of the needle assembly is kept, the needle assembly is clamped by the at least two limiting arms, the needle assembly cannot easily shake, and the physical trauma to a patient is reduced to the maximum extent.

Preferably, in order to facilitate production and assembly of the present invention, the housing includes a housing provided with a first cavity and a rear cover, the through hole is disposed at one end of the housing, an opening is disposed at an end of the housing away from the through hole, and the rear cover is disposed at an opening position of the housing to seal the opening, wherein the protrusion is disposed at the rear cover, the housing and the rear cover together form a first cavity, and the sliding sleeve, the first elastic member, the needle assembly provided with the puncture needle, and the second elastic member are all disposed inside the first cavity, which are relatively compact and facilitate assembly by a manufacturer.

Preferably, in order to enable the sliding sleeve to be stably connected with the shell in a sliding manner, a first guide arm is arranged on the inner wall of a first cavity of the shell, at least two second limiting arms are further arranged at one end of the sliding sleeve, which is connected with the first limiting arms, a second sliding rail is arranged on the outer side wall of each second limiting arm, and the second sliding rail is connected with the first guide arm in a sliding manner, so that the sliding stability of the shell is ensured, wherein, the first guide arm is an elastic arm body and forms a certain angle with the inner wall of the first cavity, after the sliding sleeve is installed, the angle between the first guide arm and the cavity is reduced, so that the first guide arm exerts transverse acting force on the position of the second limiting arm in the process of longitudinally moving along the second sliding rail, the shaking of the sliding sleeve is reduced, and the damping can be increased to reduce the amplitude, and the first elastic piece and the second elastic piece can be set into springs, so that the wound can be prevented from being repeatedly punctured by the simple harmonic motion of the springs.

Preferably, the needle assembly surface is still fixed and is provided with two at least second stoppers, the third slide rail has been seted up to the spacing arm inside wall of second, second stopper sliding connection third slide rail, wherein, the second stopper includes hollow bar shell, the opening has been seted up to bar shell one end, be provided with a plurality of elastic spring in the cavity of bar shell, the extrusion piece passes bar shell position department, and elastic spring acts on the slide, slide fixed connection extrusion piece, wherein extrusion piece contact third slide rail to reduce the shake of needle assembly at the in-process that slides.

Preferably, in order to enhance the stability of the movement of the needle assembly, the second limiting arm and/or the first limiting arm is/are elastic clamping arms which deform towards the direction of the needle assembly to press the needle assembly, and the second limiting arm and/or the first limiting arm exert transverse force on the clamping of the needle assembly during the longitudinal movement of the needle assembly in the sliding sleeve, so that the needle assembly is more stable during the movement.

Preferably, in order to facilitate the use of the medical finger grip, the surface of the shell is provided with two anti-slip grooves, the outer surfaces of the anti-slip grooves are provided with rubber layers, and medical staff can place fingers at the positions of the anti-slip grooves to enhance the stability of finger grip.

Preferably, in order to adjust the exposed length of the puncture needle, the needle assembly comprises a puncture needle and a mounting seat for mounting the puncture needle, the mounting seat is provided with a mounting groove with threads on the inner wall, the surface of one end of the puncture needle is provided with threads, and the other end of the puncture needle is triangular; wherein, the pjncture needle sets up threaded one end threaded connection mounting groove, rotates the pjncture needle, can change the position of pjncture needle and mounting groove to change the length that the pjncture needle exposes.

Preferably, in order to conveniently adjust the exposed length of the puncture needle, the mounting seat comprises a mounting tube and a mounting shell, wherein the mounting tube is detachably connected with the mounting shell, the mounting groove is arranged at the position of the mounting shell, the puncture needle can be detached from the mounting tube and then rotated, and the mounting tube has a protective effect on the puncture needle and prevents the puncture needle from being bent.

Preferably, the present invention further comprises a hollow needle cap, one end of the housing adjacent to the through hole is arranged as a first connection end, a second connection end is arranged on the inner wall of the needle cap, the housing and the needle cap are detachably connected by the cooperation of the first connection end and the second connection end, a boss is arranged inside the cavity of the needle cap, and the boss is arranged on the side wall surface far away from the second connection end, wherein when the needle cap and the housing are mounted together, the boss contacts the through hole, which completely seals the through hole, thereby preventing the puncture needle from being contaminated in an unused state.

The invention discloses a disposable peripheral blood taking needle, which is compared with the prior art:

the invention has compact structure and high safety, the needle assembly can stably slide in the inner cavity of the shell, thereby reducing the wound to the patient to the maximum extent, for the invention, when the needle assembly is not used, part of the structure of the sliding sleeve passes through the perforation and extends to the outside of the first cavity, at the moment, the first limit block is arranged at the position of the first limit groove, the second elastic piece supports against the needle assembly, the first limit block and the first limit groove can be matched in a buckling way, thereby preventing the needle assembly from moving to the position of the needle outlet along the second channel, when the blood taking needle of the invention is needed, the sliding sleeve extending outside the first cavity is contacted and pressed on the position of the skin needing blood taking, the sliding sleeve moves in the direction close to the lug in the first channel until the lug contacts and presses the upper inclined plane of the limit arm, at the moment, the inclined plane bends towards the inner wall of the first cavity, the size of the opening is enlarged, at the moment, the first limiting block does not contact with the first limiting groove, the needle assembly moves towards one end of the needle outlet in the second channel under the action of the second elastic element, the puncture needle rapidly penetrates through the needle outlet and the puncture hole under the action of thrust to puncture skin, wherein the exposed tip length of the puncture needle on the needle assembly is controlled to be 1.6-2.2mm, so that the skin puncture depth is guaranteed to be stable, the skin puncture needle does not penetrate into subcutaneous tissues and has no strong pain, the needle assembly extrudes the first elastic element arranged at the position of the second channel in the skin puncture process, because the potential energy applied by the second elastic element is larger than the maximum potential energy which can be stored by the first elastic element, the first elastic element is completely compressed under the action of the force applied by the second elastic element, the second elastic element is elongated by the needle assembly moving due to inertia in the process, and after the second elastic element moves to the farthest distance, the second elastic piece and the first elastic piece exert force in the same direction on the needle assembly, so that the puncture is quickly contracted to enter the first cavity, and the skin puncture task is completed, wherein the limiting block has a guiding function besides a function of limiting the movement of the needle assembly, and the needle assembly is embedded into the sliding rail on the surface of the first limiting arm in the process that the needle assembly moves towards one end of the needle outlet in the second channel under the action of the second elastic piece, so that the stability of the needle assembly in the moving process is maintained, the needle assembly is clamped by the at least two limiting arms, and cannot easily shake, so that the physical trauma to a patient is reduced to the maximum extent.

Drawings

FIG. 1 is a schematic illustration of an explosive structure according to the present invention;

FIG. 2 is a schematic external view of the present invention;

FIG. 3 is a cross-sectional view taken along A-A of FIG. 2;

FIG. 4 is a schematic view of the sliding sleeve of the present invention showing an angle;

FIG. 5 is a schematic view of the outer shell of the present invention at an angle;

FIG. 6 is a schematic exterior view of the present invention, differing from another angle of the housing of FIG. 5;

FIG. 7 is a schematic view of another angle of the present invention different from the sliding sleeve of FIG. 4;

FIG. 8 is a schematic view of the construction of the needle assembly of the present invention;

FIG. 9 is a cross-sectional view of the needle cap of the present invention;

fig. 10 is a schematic structural diagram of a second stopper according to the present invention.

Detailed Description

As shown in fig. 1 to 4, the present invention discloses a disposable peripheral blood collection needle comprising a housing, a sliding sleeve 3, a first elastic member 4, a needle assembly 5 with a puncture needle mounted thereon, and a second elastic member 6, the housing being provided with a first chamber, one end of the needle assembly is provided with a through hole, a first channel is formed in the first cavity, the sliding sleeve 3 is arranged at the position of the first cavity and is in sliding connection with the first channel, the sliding sleeve 3 is provided with a second cavity, a second channel with a needle outlet is formed in the second cavity, the needle outlet of the second channel is aligned with the through hole, one end of the sliding sleeve 3 passes through the through hole, the first elastic element 4 is arranged at the position of the second cavity, the needle assembly 5 is provided with a first end and a second end, the first end of the needle assembly 5 is sleeved with the first elastic element 4, and the needle assembly 5 is slidably connected with the second channel, the puncture needle 5 is aligned with the needle outlet of the second channel, and the second elastic element 6 is arranged to be sleeved and connected with the second end position of the needle assembly 5.

Wherein, as shown in fig. 4, fig. 7 and fig. 8, at least two first limiting blocks 51 are fixedly arranged on the surface of the needle assembly 5, two first limiting arms 31 are fixedly arranged on one end of the sliding sleeve 3 away from the needle outlet, a sliding rail 311 is arranged on the surface of the first limiting arm 31, an inclined plane which is bent towards the inner wall direction of the first cavity is arranged at one end of the first limiting arm 31 which is not contacted with the sliding sleeve 3 to form an opening, a first limiting groove 312 is arranged at the inclined plane position of the first limiting arm 31, a convex block is arranged at one end of the first cavity which is close to the opening of the first limiting arm 31, the first limiting blocks 51 are matched with the first limiting groove 312 to limit the needle assembly 5, a force is applied to the sliding sleeve 3, when the sliding sleeve 3 moves towards the direction close to the convex block in the first channel, the convex block contacts and extrudes the upper inclined plane of the limiting arm 31, the inclined plane is bent towards the inner wall direction of the first cavity, the size of the opening is increased, at this time, the first limiting blocks 51 are not contacted with the first limiting groove 312, the needle assembly 5 is moved towards the needle outlet end in the second channel by the second resilient member 6.

Based on the above structure, for the present invention, when the needle assembly is not used, a part of the structure of the sliding sleeve 3 passes through the through hole and extends to the outside of the first cavity, at this time, the first stopper 51 is disposed at the position of the first stopper groove 312, the second elastic member 6 abuts against the needle assembly 51, the first stopper 51 and the first stopper groove 312 can be matched in a snap-fit manner, so as to prevent the needle assembly 51 from moving to the needle outlet position along the second channel, when the blood taking needle of the present invention is required, the sliding sleeve 3 extending outside the first cavity is contacted and pressed to the position where blood is to be taken by the skin, so that the sliding sleeve 3 moves in the first channel in the direction approaching the projection until the projection contacts and presses the upper inclined plane of the stopper arm 31, at this time, the inclined plane bends in the direction of the inner wall of the first cavity, the size of the opening becomes larger, at this time, the first stopper 51 does not contact with the first stopper groove 312, the needle assembly 5 moves in the second channel in one end of the needle outlet under the action of the second elastic member 6, the puncture needle rapidly penetrates through the needle outlet and the puncture hole under the action of thrust to puncture the skin, wherein the exposed tip length of the puncture needle on the needle assembly 5 is controlled to be 1.6-2.2mm, so as to ensure that the puncture depth is stable, the skin is punctured, the puncture needle does not penetrate into subcutaneous tissues, and no strong pain is caused, in the process of puncturing the skin, the needle assembly 5 presses the first elastic element 4 arranged at the second passage position, because the potential energy applied by the second elastic element 6 is greater than the maximum storable potential energy of the first elastic element 4, the first elastic element 4 is completely compressed under the action of the force applied by the second elastic element 6, the second elastic element 6 is elongated by the needle assembly 5 moving due to inertia in the process, after the second elastic element 6 moves to the farthest distance, the second elastic element 6 and the first elastic element 4 apply the same rapid direction of force to the needle assembly 5, so that the puncture needle contracts into the first cavity, the skin puncturing task is completed, wherein the limiting block 51 has a guiding function besides a function of limiting the movement of the needle assembly 5, the needle assembly 5 is embedded into the sliding rail 311 on the surface of the first limiting arm 31 in the process that the needle assembly 5 moves towards one end of the needle outlet in the second channel under the action of the second elastic element 6, so that the stability of the movement process of the needle assembly 5 is maintained, the needle assembly 5 is clamped by the at least two limiting arms 31, the needle assembly 5 cannot easily shake, and the physical trauma to a patient is reduced to the greatest extent.

Further, as shown in fig. 1, in order to facilitate production and assembly of the present invention, the housing includes a housing 2 provided with a first cavity and a rear cover 7, a through hole is disposed at one end of the housing 2, an end of the housing 2 away from the through hole is provided with an opening, and the rear cover 7 is disposed at the opening position of the housing 2 to seal the opening, wherein a protrusion is disposed at the position of the rear cover 7, the housing 2 and the rear cover 7 together form a first cavity, and the sliding sleeve 3, the first elastic member 4, the needle assembly 5 with the puncture needle and the second elastic member 6 are all disposed inside the first cavity, which are relatively compact and facilitate assembly by a manufacturer.

Further, as shown in fig. 4 to 6, in order to enable the sliding sleeve 3 to be slidably connected to the housing 2 stably, a first guide arm 23 is disposed on an inner wall of a first cavity of the housing 2, at least two second limiting arms 32 are further disposed at an end of the sliding sleeve 3 connected to the first limiting arm 31, a second sliding rail 321 is disposed on an outer side wall of the second limiting arm 32, and the second sliding rail 321 is slidably connected to the first guide arm 23, so as to ensure the sliding stability of the housing 2, wherein the first guide arm 23 is an elastic arm body and forms a certain angle with the inner wall of the first cavity, after the sliding sleeve 3 is installed, the angle between the first guide arm 23 and the cavity is reduced, so that the first guide arm 23 exerts a transverse acting force on the position of the second limiting arm 32 during the longitudinal movement along the second sliding rail 321, so as to reduce the shaking of the sliding sleeve 3, and also increase the damping and reduce the amplitude, both the first elastic member 4 and the second elastic member 6 can be configured as springs, the simple harmonic motion of the spring can be prevented from repeatedly puncturing the wound.

Further, as shown in fig. 7 and 8, at least two second limiting blocks 52 are further fixedly disposed on the surface of the needle assembly 5, a third slide rail 322 is disposed on the inner side wall of the second limiting arm 32, and the second limiting blocks 52 are slidably connected to the third slide rail 322, wherein, optionally, as shown in fig. 10, the second limiting blocks 52 include a hollow bar-shaped housing 524, a notch is disposed at one end of the bar-shaped housing 524, a plurality of elastic springs 523 are disposed in a cavity of the bar-shaped housing 524, the extrusion block 521 passes through the position of the bar-shaped housing, the elastic springs 523 act on the sliding plate 522, the sliding plate is fixedly connected to the extrusion block 521, and the extrusion block 521 contacts with the third slide rail 322, so as to reduce the shake of the needle assembly 5 during the sliding process.

Preferably, in order to enhance the stability of the movement of the needle assembly 5, the second limiting arm 32 and/or the first limiting arm 31 are/is an elastic clip arm which deforms toward the needle assembly 5 to press the needle assembly 5, and during the longitudinal movement of the needle assembly 5 in the sliding sleeve 3, the second limiting arm 32 and/or the first limiting arm 31 exert a transverse force on the needle assembly 5 to make the needle assembly 5 more stable during the movement.

Further, as shown in fig. 4, in order to facilitate the use of the present invention, two anti-slip grooves 21 are formed on the surface of the housing 2, a rubber layer is disposed on the outer surface of the anti-slip groove 21, and medical staff can place fingers at the positions of the anti-slip grooves 21 to enhance the stability of finger clamping.

Further, as shown in fig. 8, in order to adjust the exposed length of the puncture needle, the needle assembly 5 includes a mounting seat for mounting the puncture needle and a mounting needle, the mounting seat is provided with a mounting groove with threads on the inner wall, one end surface of the puncture needle is provided with threads, and the other end is triangular; the puncture needle can be rapidly punctured into skin, one end of the puncture needle provided with threads is in threaded connection with the mounting groove, the puncture needle is rotated, the positions of the puncture needle and the mounting groove can be changed, and therefore the exposed length of the puncture needle is changed.

Optionally, in order to adjust the exposed length of the puncture needle conveniently, the mounting seat comprises a mounting tube and a mounting shell, wherein the mounting tube is detachably connected with the mounting shell, the mounting groove is arranged at the position of the mounting shell, the puncture needle can be detached from the mounting tube and then rotated, and the mounting tube has a protective effect on the puncture needle and prevents the puncture needle from being bent.

Further, as shown in fig. 9, the present invention further includes a hollow needle cap 1, one end of the housing 2 near the through hole is arranged as a first connection end, a second connection end is arranged on the inner wall of the needle cap 1, the housing 2 is detachably connected with the needle cap 1 by the cooperation of the first connection end and the second connection end, a boss is provided inside the cavity of the needle cap 1, the boss is provided on the side wall surface far from the second connection end, wherein, when the needle cap 1 and the housing 2 are mounted together, the boss contacts the through hole, which completely seals the through hole, thereby preventing the puncture needle from being contaminated in an unused state.

In conclusion, compared with the prior art, the needle assembly has the advantages that the structure is compact, the safety is high, and the needle assembly can stably slide in the inner cavity of the shell, so that the trauma to a patient is reduced to the maximum extent.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.

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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Claims

1. a disposable peripheral blood collection needle, is characterized in that, comprises:

a casing, which is arranged with a first cavity, one end of which is provided with a perforation, and a first channel is formed in the first cavity;

A sliding sleeve is arranged at the position of the first cavity and is slidably connected to the first channel, the sliding sleeve is arranged with a second cavity, and a second channel provided with a needle outlet is formed in the second cavity, The needle outlet of the second channel is aligned with the perforation, and one end of the sliding sleeve passes through the perforation;

a first elastic member, arranged at the position of the second cavity;

A needle assembly mounted with a puncture needle is provided with a first end and a second end, the first elastic member is sleeved on the first end of the needle assembly, and the needle assembly is slidably connected to the second channel, the The puncture needle is aligned with the needle outlet of the second channel;

a second elastic member, arranged to be sleeved and connected to the position of the second end of the needle assembly;

Wherein, at least two first limit blocks are fixed on the surface of the needle assembly, and two first limit arms are fixed on the end of the sliding sleeve away from the needle outlet. The surface of the first limit arms A slide rail is provided, the first limit block is interactively connected to the slide rail, and one end of the first limit arm that does not contact the sliding sleeve is provided with an opening that is bent toward the inner wall of the first cavity to form an opening, A first limiting groove is provided at the position of the inclined surface of the first limiting arm, a convex block is provided at the open end of the first cavity close to the opening of the first limiting arm, and the first limiting block is connected to the first limiting block. A limit groove cooperates to limit the position of the needle assembly, and exerts a force on the sliding sleeve, so that when the sliding sleeve moves in the direction close to the protrusion in the first channel, the protrusion contacts and squeezes the limit The upper slope of the arm is bent toward the inner wall of the first cavity, and the size of the opening becomes larger. At this time, the first limit block does not contact the first limit groove, and the needle assembly is in the first limit slot. Under the action of the two elastic members, it moves to one end of the needle outlet in the second channel.

2 . The disposable peripheral blood collection needle according to claim 1 , wherein the housing comprises a housing provided with a first cavity and a back cover, and the perforation is arranged at one end of the housing, so the One end of the casing away from the perforation is provided with an opening, and the rear cover is arranged at the opening position of the casing to seal the opening;

Wherein, the bump is arranged at the position of the back cover.

3 . The disposable peripheral blood collection needle according to claim 2 , wherein the inner wall of the first cavity of the casing is provided with a first guide arm, and the sliding sleeve is connected to one end of the first limit arm. 4 . At least two second limit arms are also provided, and the outer side walls of the second limit arms are provided with a second slide rail, and the second slide rail is slidably connected to the first guide arm.

4 . The disposable peripheral blood collection needle according to claim 3 , wherein at least two second limit blocks are also fixedly arranged on the surface of the needle assembly, and the inner sidewall of the second limit arm is opened. 5 . There is a third slide rail, and the second limit block is slidably connected to the third slide rail.

5 . The disposable peripheral blood collection needle according to claim 4 , wherein the second limit arm and/or the first limit arm is an elastic clamping arm, which is directed toward the needle assembly. 6 . The direction is deformed, compressing the needle assembly.

6 . The disposable peripheral blood collection needle according to claim 2 , wherein two anti-skid grooves are formed on the surface of the casing, and a rubber layer is provided on the outer surface of the anti-skid groove. 7 .

7 . The disposable peripheral blood collection needle according to claim 2 , wherein the needle assembly comprises a mounting seat for mounting the puncture needle, the mounting seat is provided with a mounting groove whose inner wall is provided with threads, and the The surface of one end of the puncture needle is provided with a thread, and the other end is provided with a triangular shape;

Wherein, one end of the puncture needle provided with a thread is threadedly connected to the installation groove.

8 . The disposable peripheral blood collection needle according to claim 7 , wherein the mounting base comprises a mounting tube and a mounting shell, wherein the mounting tube is detachably connected to the mounting shell, and the mounting shell is detachable. 9 . A mounting groove is arranged at the mounting shell location.

9 . The disposable peripheral blood collection needle according to claim 2 , further comprising a hollow needle cap, one end of the casing close to the perforation is arranged as the first connection end, and the inner wall of the needle cap is arranged with The second connecting end, the housing and the needle cap are detachably connected through the cooperation of the first connecting end and the second connecting end.

10 . The disposable peripheral blood collection needle according to claim 9 , wherein a boss is arranged inside the cavity of the needle cap, and the boss is arranged on a side wall away from the second connection end. 11 . surface wherein, when the needle cap is mounted with the housing, the boss contacts the perforation, which completely seals the perforation.