CN115708909A - Resilience formula safety syringe needle - Google Patents

Abstract

The invention discloses a rebound type safety injection needle which comprises a shell structure, wherein a rebound pressing structure, a transmission structure, a stop block and an inner cylinder are sequentially arranged in an inner cavity of the shell structure from top to bottom; an auxiliary block is arranged in the transmission structure, and the lower end of the auxiliary block penetrates through the lower end face of the transmission structure and is matched with the lower stop block; the lower end of the lower stopping block is fixedly provided with a needle seat, and the lower end of the needle seat is fixedly provided with an injection needle head in an inserting way; the lower end of the inner cylinder is provided with a through hole, the through hole is communicated with the inner cavity of the inner cylinder, and the needle seat is in inserting fit with the through hole; a rebound spring is arranged between the lower end of the lower stopping block and the bottom surface of the inner cylinder together, and the rebound spring is sleeved on the needle seat; and the upper end shell structure of the lower stop block is in contact fit. The resilience type safe injection needle can effectively maintain the safety of medical personnel, improve the accuracy and the firmness of injection and reduce the uncomfortable feeling when the needle head of the injection needle is separated from a patient.

Description

Resilience formula safety syringe needle

Technical Field

The invention relates to the technical field of medical instruments, in particular to a rebound type safety injection needle.

Background

An injection needle is a medical device used for injecting an injection solution into a patient. After the syringe needle uses, medical personnel can sheathe in the needle cover, and the syringe needle after using is kept apart the protection and is got up, nevertheless at the suit in-process of needle cover, appears medical personnel because of misoperation easily and is by the condition of back syringe needle injury to lead to the problem of blood infection to appear, and the needle cover of sheatheeing in also probably drops because of external force, leads to the isolation protection inefficacy to the syringe needle after using, thereby appears the safety risk. Thus, a resilient safety injection needle is proposed.

Disclosure of Invention

The invention mainly aims to provide a rebound type safety injection needle which can effectively solve the problems in the background technology.

In order to achieve the purpose, the invention adopts the technical scheme that:

a rebound type safe injection needle comprises a shell structure, wherein a rebound pressing structure, a transmission structure, a stopping block and an inner cylinder are sequentially arranged in an inner cavity of the shell structure from top to bottom; an auxiliary block is arranged in the transmission structure, and the lower end of the auxiliary block penetrates through the lower end face of the transmission structure and is matched with the lower stop block; the lower end of the lower stopping block is fixedly provided with a needle seat, and the lower end of the needle seat is fixedly provided with a needle head of an injection needle in an inserting way; the lower end of the inner cylinder is provided with a through hole, the through hole is communicated with the inner cavity of the inner cylinder, and the needle seat is in inserting fit with the through hole; a rebound spring is arranged between the lower end of the lower stopping block and the bottom surface of the inner cylinder together, and the rebound spring is sleeved on the needle seat; the upper end shell structure of the stopping block is in contact fit, and when the lower end of the stopping block is in contact fit with the shell structure, the rebound spring is in a state of compressing and accumulating elastic potential energy.

Preferably, the outer shell structure comprises an outer cylinder, a mounting pipe is fixedly mounted at the lower end of the outer cylinder, and the inner cavity of the mounting pipe is communicated with the inner cavity of the outer cylinder; the lower stopping block and the inner wall of the installation pipe form sliding seal; the inner cylinder is fixedly arranged on the inner cylindrical surface of the installation pipe, the bottom surface of the outer cylinder is fixedly provided with a rebound trigger frame, and the rebound trigger frames are arranged in a plurality and distributed in an annular array mode by taking the central line of the outer cylinder as an array center; the springback trigger frame consists of a springback trigger block and a connecting arc strip.

Preferably, the longitudinal section of the rebound trigger block is triangular, and the connecting arc strip is made of elastic material; one end of the connecting arc strip is fixedly connected with the bottom surface of the outer barrel, and the other end of the connecting arc strip is fixedly connected with the rebound trigger block; the one end that meets with connecting the arc strip on the trigger block that kick-backs contacts the cooperation with the upper end of ending the piece down, and when the trigger block that kick-backs contacts the cooperation with the upper end of ending the piece down, the resilience spring is in the compression and accumulates the elastic potential energy state.

Preferably, the rebound pressing structure comprises an inner tube, the inner tube is positioned in the outer tube, the lower end of the inner tube is fixedly provided with a connector, the inner cylindrical surface of the inner tube is fixedly provided with a lower stop top plate, and the lower stop top plate is arranged in an upward inclined manner; and a guard plate is fixedly arranged on the upper side of the inner cylindrical surface of the inner tube and is arranged above the lower stop top plate.

Preferably, the transmission structure comprises a transmission block, the upper end of the transmission block is provided with a clamping cavity, the lower end of the transmission block is provided with an installation cavity, and the lower end of the transmission block is fixedly provided with a resilience driving block; the mounting cavity is communicated with the clamping cavity and penetrates through the lower end face of the resilience driving block; a clamping groove is formed in the wall of the mounting cavity; and a clamping ring is fixedly mounted on the outer side surface of the auxiliary block, and the auxiliary block and the clamping ring are respectively matched with the mounting cavity and the clamping groove.

Preferably, the inner tube and the connector are integrally manufactured, and the inner cavity of the inner tube penetrates through the lower end face of the connector; the connector is clamped and installed in the clamping cavity; the outer surface of the transmission block and the inner surface of the rebound trigger block form inclined surface transmission, when the transmission block moves downwards, the rebound trigger block swings towards the bottom surface of the outer barrel to bend the connecting arc strip, and when the rebound trigger block swings to be separated from contact with the stopping block, the rebound spring rebounds to reset, so that the auxiliary block, the stopping block, the needle seat and the injection needle head move towards the guard plate in the inner cavity of the inner tube, and the injection needle head is collected into the shell structure.

Preferably, the upper end surface of the stop top plate is in contact fit with the lower end surface of the stop block, and the injection needle is held in the housing structure when the upper end surface of the stop top plate is in contact fit with the lower end surface of the stop block.

Compared with the prior art, the invention has the following beneficial effects:

1. effectively maintaining the safety of medical staff: the needle sleeve which can be sleeved on the mounting tube is arranged, and the needle sleeve can cover the needle head of the injection needle, so that the needle head of the injection needle and medical staff can be isolated before use, and the effect of protecting the medical staff is achieved; through setting up the resilience spring, triggering the piece and breaking away from the contact back with ending down the piece in making the resilience, the resilience spring extension resets, with supplementary piece, end piece and needle file push into in the inner tube, take in the shell structure with the syringe needle, and can make the syringe needle of taking in the shell structure can not stretch out from the shell structure again through ending down the piece and ending the top plate cooperation, realize the continuous isolation protection to syringe needle after the injection, thereby can be after the injection, avoid medical personnel to be injectd by the syringe needle injury after the injection, can thoroughly prevent that medical personnel from contacting the syringe needle after the injection and cause blood infection scheduling problem, play protection medical personnel's effect.

2. Improve the accuracy and the firmness of injection: shell structure, resilience press down structure, transmission structure, inner tube, needle file, end piece, supplementary piece and make by colorless transparent material, are provided with the scale mark of instructing injection liquid level height on the urceolus, and at the injection operation in-process, medical personnel can clearly observe the liquid level situation, and medical personnel also can in time be according to the liquid level height to accuse patient's reaction in addition, can improve the accuracy nature and the firm nature of injection.

3. The discomfort is reduced: in going into shell structure with the syringe needle bullet through rebound spring, make syringe needle automatic and patient break away from the contact, reduced the manual action of pulling out the needle after the injection, syringe needle and patient break away from accomplish in the twinkling of an eye, can reduce the patient and feel because of pulling out the painful of bringing, can reduce uncomfortable and feel.

Drawings

FIG. 1 is a cross-sectional view of the structure with a rebound spring in a compressed state;

FIG. 2 is a sectional view of the inner structure;

FIG. 3 is a cross-sectional view of the housing structure;

FIG. 4 is a schematic view of the structure at A;

FIG. 5 is a cross-sectional view of a resilient press structure;

FIG. 6 is a cross-sectional view of the transmission structure;

FIG. 7 is a cross-sectional view of an auxiliary block;

FIG. 8 is a schematic view of the structure of the lower block;

FIG. 9 is a sectional view of the rebound spring in an extended reset configuration;

fig. 10 is a schematic view of the overall structure of a resilient safety injection needle according to the present invention.

In the figure: 1. a housing structure; 2. a resilient pressing structure; 3. a transmission structure; 4. an inner barrel; 41. perforating; 5. a needle seat; 51. a first drain hole; 6. a lower stopping block; 61. a second drainage hole; 62. a liquid guide groove; 7. an auxiliary block; 8. a rebound spring; 9. a needle head of the injection needle; 10. a needle guard; 11. an outer cylinder; 12. installing a pipe; 13. a rebound trigger frame; 131. a rebound trigger block; 132. connecting the arc strips; 21. an inner tube; 22. a connector; 23. a stop top sheet; 24. a guard plate; 31. a transmission block; 32. a clamping cavity; 33. a mounting cavity; 331. a clamping groove; 332. a rebound driving block; 71. and (4) clamping the ring.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained by combining the specific embodiments.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1-9, a rebound safety injection needle comprises a shell structure 1, wherein a rebound pressing structure 2, a transmission structure 3, a stop block 6 and an inner cylinder 4 are sequentially arranged in an inner cavity of the shell structure 1 from top to bottom; an auxiliary block 7 is arranged in the transmission structure 3, and the lower end of the auxiliary block 7 penetrates through the lower end face of the transmission structure 3 and is matched with the lower stop block 6; the lower end of the lower stop block 6 is fixedly provided with a needle seat 5, and the lower end of the needle seat 5 is fixedly provided with an injection needle head 9 in an inserting way; the lower end of the inner cylinder 4 is provided with a through hole 41, the through hole 41 is communicated with the inner cavity of the inner cylinder 4, and the needle seat 5 is in penetrating fit with the through hole 41; a rebound spring 8 is arranged between the lower end of the lower stopping block 6 and the bottom surface of the inner cylinder 4, and the rebound spring 8 is sleeved on the needle seat 5; the upper end of the stop block 6 is in contact fit with the shell structure 1, and when the lower end of the stop block 6 is in contact fit with the shell structure 1, the rebound spring 8 is in a state of compressing and accumulating elastic potential energy.

It should be noted that, shell structure 1, resilience press structure 2, transmission structure 3, inner tube 4, needle file 5, lower piece 6, supplementary piece 7 are made by colorless transparent material, and at the injection operation in-process, medical personnel can clearly observe the liquid level situation, and medical personnel also can in time be according to the liquid level height patient's reaction of controlling in addition, improve the accuracy nature and the firm nature of injection.

As a further explanation of the above technical solution, the housing structure 1 comprises an outer cylinder 11; the outer cylinder 11 is used for loading the injection, the outer cylinder 11 is provided with scale marks for indicating the height of the liquid level of the injection, and the injection is positioned between the bottom surface of the outer cylinder 11 and the transmission structure 3 when the injection operation is not performed; the lower end of the outer cylinder 11 is fixedly provided with a mounting pipe 12, and the inner cavity of the mounting pipe 12 is communicated with the inner cavity of the outer cylinder 11; the lower stop block 6 and the inner wall of the mounting pipe 12 form a sliding seal, and the lower stop block 6 is inserted and matched at the upper end of the inner cylinder 4; the inner cylinder 4 is fixedly arranged on the inner cylindrical surface of the mounting tube 12, and the end surface of the inner cylinder 4 is flush with the end surface of the mounting tube 12; the bottom surface of the outer barrel 11 is fixedly provided with a plurality of rebound trigger frames 13, the rebound trigger frames 13 are distributed in an annular array by taking the central line of the outer barrel 11 as the array center, and a gap is reserved between every two adjacent rebound trigger frames 13; in a specific embodiment, at least two rebound trigger frames 13 are provided, and when two rebound trigger frames 13 are provided, the two rebound trigger frames 13 are arranged in 180-degree rotational symmetry; the rebound trigger frame 13 is composed of a rebound trigger block 131 and a connecting arc bar 132. The longitudinal section of the springback trigger block 131 is triangular, the connecting arc strip 132 is made of elastic material, and the connecting arc strip 132 can be bent and deformed; one end of the connecting arc strip 132 is fixedly connected with the bottom surface of the outer barrel 11, and the other end is fixedly connected with the rebound trigger block 131; one end of the rebound trigger block 131 connected with the connecting arc bar 132 is in contact fit with the upper end of the stop block 6, and when the rebound trigger block 131 is in contact fit with the upper end of the stop block 6, the rebound spring 8 is in a state of compressing and accumulating elastic potential energy.

It should be noted that the lower stop block 6 is a T-shaped cylindrical structure, the upper surface of the lower stop block 6 is a curved surface recessed downward, the lower stop block 6 and the needle base 5 are integrally formed, the lower stop block 6 is provided with a second liquid guiding hole 61 penetrating up and down, the needle base 5 is provided with a first liquid guiding hole 51 penetrating up and down, the upper end of the lower stop block 6 is provided with a liquid guiding groove 62, the lowest position of the liquid guiding groove 62 is located below the bottom surface of the outer cylinder 11, the liquid guiding groove 62, the second liquid guiding hole 61, the first liquid guiding hole 51 and the inner cavity of the needle head 9 are sequentially communicated, the injection in the outer cylinder 11 can enter the needle head 9 through the liquid guiding groove 62, the second liquid guiding hole 61 and the first liquid guiding hole 51, and injection operation of the injection can be performed when the rebound pressing structure 2 is pressed downward.

As a further explanation of the above technical solution, the rebound pressing structure 2 includes an inner tube 21, the inner tube 21 is located in the outer cylinder 11, the lower end of the inner tube 21 is fixedly installed with a connector 22, an inner cylindrical surface of the inner tube 21 is fixedly installed with a lower stop top plate 23, the lower stop top plate 23 is arranged in an upward inclined manner, the lower stop top plate 23 is an elastic sheet, the lower stop top plate 23 is provided with a plurality of pieces, and the pieces are distributed in an annular array by taking a central line of the inner tube 21 as an array center; in the specific embodiment, at least two stop top sheets 23 are provided, and when two stop top sheets 23 are provided, the two stop top sheets 23 are arranged at intervals; a guard plate 24 is fixedly mounted on the upper side of the inner cylindrical surface of the inner tube 21, and the guard plate 24 is arranged above the lower stop top plate 23. The upper end surface of the stopper top plate 23 is in contact with and fitted to the lower end surface of the stopper 6, and the needle tip 9 is held in the housing structure 1 when the upper end surface of the stopper top plate 23 is in contact with and fitted to the lower end surface of the stopper 6.

The transmission structure 3 comprises a transmission block 31, the transmission block 31 is positioned in the outer barrel 11, and the transmission block 31 and the inner wall of the outer barrel 11 form a sliding seal, so that the transmission block 31 can slide in the outer barrel 11, and the injection in the outer barrel 11 cannot leak above the transmission block 31 in the sliding process of the transmission block 31; the upper end of the transmission block 31 is provided with a clamping cavity 32, the lower end of the transmission block 31 is provided with a mounting cavity 33, and the lower end of the transmission block 31 is fixedly provided with a rebound driving block 332; the mounting cavity 33 is communicated with the clamping cavity 32 and penetrates through the lower end face of the rebound driving block 332; the wall of the installation cavity 33 is provided with a clamping groove 331; the outer side surface of the auxiliary block 7 is fixedly provided with a clamping ring 71, and the auxiliary block 7 and the clamping ring 71 are respectively matched with the installation cavity 33 and the clamping groove 331; when the auxiliary block 7 and the engaging ring 71 are engaged in the mounting cavity 33 and the engaging groove 331, respectively, a seal is formed between the auxiliary block 7 and the transmission structure 3.

It should be noted that the inner tube 21 and the connector 22 are integrally formed, and an inner cavity of the inner tube 21 penetrates through the lower end surface of the connector 22 and is communicated with the clamping cavity 32; the connector 22 is clamped and installed in the clamping cavity 32; when the engaging ring 71 is disengaged from the engaging groove 331 upward, the auxiliary block 7 enters the inner tube 21.

It should be noted that the outer surface of the transmission block 31 and the inner surface of the rebound trigger block 131 form an inclined surface transmission, when the transmission block 31 moves down, the rebound trigger block 131 swings towards the bottom surface of the outer barrel 11 to bend the connecting arc 132, when the rebound trigger block 131 swings to be separated from the contact with the stop block 6, the rebound spring 8 rebounds to reset, so that the auxiliary block 7, the stop block 6, the needle seat 5 and the needle head 9 move towards the guard plate 24 in the inner cavity of the inner tube 21, and the needle head 9 is retracted into the housing structure 1, thereby realizing the protection after injection.

It should be noted that the present invention further includes a needle sheath 10, which is sleeved on the mounting tube 12 before the injection of the needle 9, and covers the needle 9 to protect the needle before the injection

The invention relates to a rebound type safe injection needle, which has two initial rotating states when in use; the first initial state is: the lower stop block 6 is positioned in the installation tube 12 and is contacted with the end face of the rebound trigger block 131, the rebound spring 8 is compressed, the needle head 9 of the injection needle extends out of the outer side of the shell structure 1, the transmission structure 3 is close to the bottom surface of the outer cylinder 11, and the outer cylinder 11 is not filled with injection; the second initial state is: in contrast to the first initial state, the drive structure 3 is remote from the bottom of the outer cylinder 11, and the outer cylinder 11 contains the injection solution.

When the syringe is used from the first initial state, the needle sleeve is taken down firstly, then the needle head 9 of the injection needle is pulled up to the rebound pressing structure 2 in the injection bottle, so that negative pressure is formed in the outer cylinder 11, the injection is pumped into the outer cylinder 11, and then injection operation is carried out; when injection is carried out, the needle head 9 of the injection needle is pierced into the body of a patient, then the rebound pressing structure 2 is pressed downwards to inject injection liquid into the body of the patient, the rebound pressing structure 2 is continuously pressed downwards, the auxiliary block 7 is contacted with the stop block 6 before the transmission block 31 is contacted with the rebound trigger block 131, when the transmission block 31 is contacted with the rebound trigger block 131, the rebound trigger frame 13 starts to bear force, the connecting arc strip 132 deforms along with the continuous pressing of the rebound pressing structure 2, the rebound trigger block 131 outwards turns, the clamping ring 71 gradually moves upwards to be separated from the clamping groove 331 along with the further pressing of the rebound pressing structure 2, the clamping ring 71 is separated from the clamping groove 331 before the rebound trigger block 131 outwards turns away from the stop block 6, at the moment that the rebound trigger block 131 is separated from the stop block 6, the rebound spring 8 is reset to be extended to the original length, the auxiliary block 7, the stop block 6 and the needle seat 5 are pushed into the inner tube 21, the needle head 9 is put into the shell structure 1, the stop block 6 is moved upwards to the top of the stop top plate 23, and the needle seat 6 is prevented from being pushed upwards, and the needle head 9 is pushed back to the outside, and the needle seat is moved to the needle structure again.

When the syringe is used from the second initial state, the needle sleeve can be directly taken down for injection operation, and the injection operation process in the second initial state is basically consistent with the injection operation process in the first initial state.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (7)

1. A resilient safety injection needle comprising a housing structure (1), characterized in that: a rebound pressing structure (2), a transmission structure (3), a stop block (6) and an inner barrel (4) are sequentially arranged in the inner cavity of the shell structure (1) from top to bottom; an auxiliary block (7) is arranged in the transmission structure (3), and the lower end of the auxiliary block (7) penetrates through the lower end face of the transmission structure (3) and is matched with the lower stop block (6); a needle seat (5) is fixedly arranged at the lower end of the lower stopping block (6), and an injection needle head (9) is fixedly arranged at the lower end of the needle seat (5) in an inserting manner; the lower end of the inner cylinder (4) is provided with a through hole (41), the through hole (41) is communicated with the inner cavity of the inner cylinder (4), and the needle seat (5) is in inserting fit with the through hole (41); a rebound spring (8) is arranged between the lower end of the lower stopping block (6) and the bottom surface of the inner cylinder (4) together, and the rebound spring (8) is sleeved on the needle seat (5); the upper end shell structure (1) of the stop block (6) is in contact fit, and when the lower end of the stop block (6) is in contact fit with the shell structure (1), the rebound spring (8) is in a state of compressing and accumulating elastic potential energy.

2. A resilient safety injection needle according to claim 1, wherein: the shell structure (1) comprises an outer cylinder (11), the lower end of the outer cylinder (11) is fixedly provided with a mounting pipe (12), and the inner cavity of the mounting pipe (12) is communicated with the inner cavity of the outer cylinder (11); the lower stop block (6) and the inner wall of the mounting pipe (12) form sliding seal; the inner cylinder (4) is fixedly arranged on the inner cylindrical surface of the mounting pipe (12), the bottom surface of the outer cylinder (11) is fixedly provided with a plurality of rebound trigger frames (13), and the rebound trigger frames (13) are distributed in an annular array mode by taking the central line of the outer cylinder (11) as the array center; the rebound trigger frame (13) consists of a rebound trigger block (131) and a connecting arc bar (132).

3. A resilient safety injection needle according to claim 2, wherein: the longitudinal section of the rebound trigger block (131) is triangular, and the connecting arc strip (132) is made of elastic material; one end of the connecting arc strip (132) is fixedly connected with the bottom surface of the outer barrel (11), and the other end of the connecting arc strip is fixedly connected with the rebound trigger block (131); one end that meets with connecting arc strip (132) on resilience trigger block (131) contacts the cooperation with the upper end of ending down piece (6), and when resilience trigger block (131) contacts the cooperation with the upper end of ending down piece (6), resilience spring (8) are in the compression and accumulate the elastic potential energy state.

4. A resilient safety injection needle according to claim 3, wherein: the rebound pressing structure (2) comprises an inner tube (21), the inner tube (21) is positioned in the outer tube (11), a connector (22) is fixedly installed at the lower end of the inner tube (21), a lower stopping top plate (23) is fixedly installed on the inner cylindrical surface of the inner tube (21), and the lower stopping top plate (23) is arranged in an upward inclined mode; and a guard plate (24) is fixedly arranged on the upper side of the inner cylindrical surface of the inner pipe (21), and the guard plate (24) is arranged above the lower stop top plate (23).

5. A resilient safety injection needle according to claim 4, wherein: the transmission structure (3) comprises a transmission block (31), the upper end of the transmission block (31) is provided with a clamping cavity (32), the lower end of the transmission block (31) is provided with a mounting cavity (33), and the lower end of the transmission block (31) is fixedly provided with a rebound driving block (332); the mounting cavity (33) is communicated with the clamping cavity (32) and penetrates through the lower end face of the rebound driving block (332); a clamping groove (331) is formed in the wall of the mounting cavity (33); the outer side face of the auxiliary block (7) is fixedly provided with a clamping ring (71), and the auxiliary block (7) and the clamping ring (71) are respectively matched with the mounting cavity (33) and the clamping groove (331).

6. A resilient safety injection needle according to claim 5, wherein: the inner tube (21) and the connector (22) are integrally manufactured, and an inner cavity of the inner tube (21) penetrates through the lower end face of the connector (22); the connector (22) is clamped and installed in the clamping cavity (32); the outer surface of transmission piece (31) and the internal surface of resilience trigger block (131) constitute the inclined plane transmission, when transmission piece (31) move down, resilience trigger block (131) swing to the section of thick bamboo bottom surface of outer section of thick bamboo (11), make and connect arc strip (132) bending, when resilience trigger block (131) swing to break away from the contact with end piece (6), resilience spring (8) kick-back resets, make supplementary piece (7), end piece (6), needle file (5) and syringe needle (9) move to backplate (24) in inner tube (21) inner chamber, with syringe needle (9) income shell structure (1) in.

7. A resilient safety injection needle according to claim 6 wherein: the upper end surface of the lower stop top plate (23) is in contact fit with the lower end surface of the lower stop block (6), and the injection needle head (9) is kept in the shell structure (1) when the upper end surface of the lower stop top plate (23) is in contact fit with the lower end surface of the lower stop block (6).

Images