CN107469188B

CN107469188B - Safety needle

Info

Publication number: CN107469188B
Application number: CN201710656337.1A
Authority: CN
Inventors: 张兢
Original assignee: Anhui Medfaith Medical Devices Co ltd
Current assignee: Anhui Medfaith Medical Devices Co ltd
Priority date: 2017-08-03
Filing date: 2017-08-03
Publication date: 2023-04-18
Anticipated expiration: 2037-08-03
Also published as: CN107469188A

Abstract

The invention discloses a safety needle with a catching groove structure, and belongs to the technical field of medical materials. The safety needle of the present invention includes a cap, a needle member, a hub, a second kit, and/or a first kit. The cap is matched with the second sleeve body in a sliding way, the needle head piece is fixedly arranged in the needle base, the first sleeve body is matched with the needle base in a sliding way, and the second sleeve body is matched with the first sleeve body in a sliding way. The surfaces of the needle stand and the first sleeve body are provided with catching grooves, the first sleeve body is provided with a first elastic sheet, and the lower surface of the first elastic sheet is provided with a first component; the second elastic sheet is arranged on the second sleeve body, and a second component is arranged on the lower surface of the second elastic sheet. The inclination angle of catching groove matches with the hook for when starting safety needle, first cover body and second cover body are outside to slide and reach the pull locking, are wrapped up safety needle in the cover body. The safety needle has the advantages of simple structure, easy operation, low manufacturing cost, potential safety hazard avoidance and good popularization.

Description

Safety needle

Technical Field

The invention discloses a safety needle with a catching groove structure, and belongs to the technical field of medical materials.

Background

The disposable needle is usually used in injection or blood sampling and is only provided with a cap. Such disposable needles have the following disadvantages: one is that it does not prevent the risk of reuse to cross-infection after use; secondly, by means of cap back-buckling, the medical care personnel are easily infected due to the requirement that the cap back-buckling needle head needs to be operated accurately, and meanwhile, the needle head cannot be locked stably after the cap is back-buckled, and the cap is easy to fall off.

The safety needle is designed to have a needle protection structure in order to avoid puncture or infection of medical staff and recovery staff in the needle design. The protective structure generally takes the form of a dead-locked needle. Some safety needles in the market at present are not strong in operability, for example, the invention patent application number is 201280006699.1, the patent designs a needle sleeve and a protective sleeve structure, and the purpose of locking a needle body is achieved by arranging a pressing protective sleeve and the needle sleeve at the neck end of the needle body, however, the needle head cannot be directly operated in a horizontal position, otherwise, the needle body has the defect of shielding, and therefore blood sampling or injection operation is not facilitated, and meanwhile, the needle body can be clamped in the needle sleeve only by a large pressing effect, so that the safety needle is poor in operability.

Disclosure of Invention

The safety needle with the catching groove structure is simple in structure and easy to operate, and due to the ingenious design structure, the safety needle cannot be reused after being used once, so that the hidden danger of puncture or infection is avoided.

In order to achieve the technical purpose, the technical scheme is mainly as follows:

a safety needle comprises a cap, a needle head piece, a needle base, a first sleeve body and a second sleeve body.

The cap is matched with the second sleeve body in a sliding mode, the needle head piece is fixedly arranged on the needle base, the first sleeve body is matched with the needle base in a sliding mode, and the second sleeve body is matched with the first sleeve body in a sliding mode.

The second sleeve body is provided with a third positioning bulge, a second elastic sheet) and a third blocking body, and the lower surface of each second elastic sheet is provided with a second hook.

The first sleeve body is provided with a first elastic sheet, a fifth buckle groove, a second positioning bulge, a sixth buckle groove, a fourth buckle groove, a second slide way and a second stopper, and the lower surface of each first elastic sheet is provided with a first hook piece.

The needle seat is provided with a first catching groove, a first positioning bulge, a second catching groove, a third catching groove, a first slideway and a first blocking body.

Specifically, the needle head part comprises a needle body and an inner plug which are integrally formed.

Specifically, the outer surface of the second sleeve body is circumferentially provided with a third positioning protrusion, the outer surface of the rear end of the second sleeve body is circumferentially provided with a plurality of vertical surface protrusions, and the number of the second elastic sheets is at least one.

Specifically, the first sleeve body is provided with a fifth buckle groove, a second positioning protrusion, a sixth buckle groove, a second slide way and a fourth buckle groove in sequence from the front end to the rear end, the first elastic sheet and the second slide way are arranged at intervals, and the fifth buckle groove, the second positioning protrusion, the sixth buckle groove, the second slide way, the fourth buckle groove and the first elastic sheet are all provided with at least one.

Specifically, the outer surface of the needle seat is sequentially provided with a second catching groove, a first positioning protrusion, a third catching groove, a first slide way and a first catching groove from the front end to the rear end, and the second catching groove, the first positioning protrusion, the third catching groove, the first slide way and the first catching groove are all provided with at least one.

Specifically, the inclined angle a of the front end of the fourth catching groove is more than or equal to the inclined angle b of the front end of the second hook piece; the inclination angle c of the rear end of the fourth catching groove is less than or equal to the inclination angle d of the rear end of the second hook piece; the inclination angle e of the fifth catching groove is smaller than or equal to the inclination angle f of the tail end of the second hook, and the inclination angle g formed at the front end of the sixth catching groove is smaller than or equal to the inclination angle h of the front end of the third baffle; the inclination angle j of the second catching groove is smaller than or equal to the inclination angle i of the tail end of the first component, and the inclination angle l of the front end of the third catching groove is smaller than or equal to the inclination angle k of the front end of the second retaining body.

When the second hook piece moves to the tail end of the second protruding part, the second hook piece of the second elastic piece is downwards buckled into the fifth buckling groove under the action of elastic force, and at the moment, the second sleeve body and the first sleeve body are locked; meanwhile, the first sleeve body moves forwards along the needle base, the first hook piece slides out of the first buckling groove and slides along the first slide way, when the first hook piece moves forwards to the first positioning protrusion, the tail end of the first positioning protrusion enables the first hook piece of the first elastic piece to be buckled downwards into the second buckling groove under the action of elastic force, and at the moment, the first sleeve body is locked with the needle base.

The invention also provides a safety needle comprising a cap, a needle piece, a needle hub and a second kit.

The cap is matched with the second sleeve body in a sliding way, the needle head piece is fixedly arranged in the needle base, and the needle base is matched with the second sleeve body in a sliding way.

The needle head piece comprises a needle body and an inner plug which are integrally formed.

The outer surface of the needle base is provided with a second catching groove, a first positioning bulge, a third catching groove, a first slide way and a first catching groove in sequence from the front end to the rear end, and the second catching groove, the first positioning bulge, the third catching groove, the first slide way and the first catching groove are all provided with at least one.

The second sleeve body is provided with a third positioning protrusion, at least one second elastic sheet, a third blocking body and a plurality of vertical surface protrusions; the lower surface of each second elastic sheet is provided with a second hook piece.

The inclination angle f of the rear end of the second hook is larger than or equal to the inclination angle g of the rear end of the second catching groove, and the inclination angle h of the front end of the third blocking body is larger than or equal to the inclination angle l of the front end of the third catching groove.

The second safety needle provided by the invention is used by opening the cap, moving the second sleeve forward along the needle base, sliding the second hook out of the first buckle groove, sliding the second hook to the first positioning bulge along the first slide way, and then continuously moving to the tail end of the second bulge to enable the second member of the second elastic sheet to be downwards buckled into the second buckle groove, and at the moment, locking the second sleeve with the needle base.

The two safety needles provided by the invention can be applied to injection syringes or blood sampling syringes.

Advantageous effects

According to the needle base, the inclination angle of one side of the first buckle groove of the needle base is matched with the inclination angle of the same side of the first hook piece of the first sleeve body, the first component easily slides out of the first buckle groove along the first slide way, and the first sleeve body is not easy to slide along the opposite direction, so that the first sleeve body is fixedly sleeved on the surface of the needle base.

The inclined angle of the rear end of the first bulge of the needle base is matched with the inclined angle of the front end of the first hook piece of the first sleeve body, so that the first member can easily slide along the first slide way and pass through the first bulge, and meanwhile, the first member is not easy to slide after entering the second buckle groove due to the fact that the inclined angle of the rear end of the second buckle groove is matched with the inclined angle of the first member.

The invention can also provide the safety needle with only one sleeve body, and the needle body is locked in the sleeve body and cannot move when in use, thereby realizing the technical effect of safety.

The safety needle has simple structure, strong operability and smaller force required for implementation, and can lock the needle body, thereby avoiding the risk of infection or puncture injury to medical personnel and recycling personnel. The safety needle has low manufacturing cost, obvious economic benefit, no secondary pollution and no secondary investment to avoid potential safety hazard, thereby having obvious social benefit and being suitable for large-scale popularization.

Drawings

FIG. 1 is a perspective view of a first safety needle of the present invention shown disassembled

FIG. 2 is an undetached perspective view of a first safety needle of the present invention

FIG. 3 is a perspective view of a first safety needle cap of the present invention

FIG. 4 is a perspective view of the second sheath of the safety needle

FIG. 5A perspective view of the first set of safety needles

Fig. 6 is a three-dimensional structure of the safety needle seat

FIG. 7 is a cross-sectional view of a safety needle including a cap

FIG. 8 safety needle top view

FIG. 9 isbase:Sub>A schematic sectional view of the safety needle at A-A when not opened

Fig. 10 is a cross-sectional view of the safety needle B-B when not opened

FIG. 11 is an enlarged view of a portion of the second sheath and the first sheath of the safety needle

FIG. 12 is a schematic view of the side B-B of the safety needle when it is opened

FIG. 13 is an enlarged view of the first sheath and the second sheath on the A-A side of the safety needle at the time of non-opening

FIG. 14 is an enlarged view of the second sheath and the first sheath on the A-A side of the safety needle at the time of opening

FIG. 15 is a schematic enlarged view of a part of the first sheath and the needle seat on the B-B surface of the safety needle when the safety needle is opened

FIG. 16 is a cross-sectional view of a second safety needle of the present invention

FIG. 17 is a perspective view of a second safety needle of the present invention

FIG. 18 isbase:Sub>A schematic view of side A-A ofbase:Sub>A second safety needle of the present invention

FIG. 19A sectional view of safety needle B-B with only second sheath

FIG. 20 perspective view of a second safety needle of the present invention

FIG. 21A-A schematic view ofbase:Sub>A second safety needle of the present invention

FIG. 22 is a schematic view of a second safety needle of the present invention on side B-B

FIG. 23 is an enlarged view of a portion of the second safety needle B of the present invention shown in section B-B when the safety needle is opened

FIG. 24 is a schematic view of embodiment 1

FIG. 25 is a schematic view of embodiment 2.

Reference numerals

1-cover cap

2-needle head, 21-needle body, 22-inner plug

3-needle seat, 31-first buckle groove, 32-first positioning projection, 33-second buckle groove, 34-third buckle groove, 35-first slideway and 36-first gear

4-a first sleeve body, 41-a first elastic sheet, 42-a fourth buckle groove, 43-a second positioning bulge, 44-a fifth buckle groove, 45-a sixth buckle groove, 46-a second slide way, 47-a second baffle body and 48-a first hook piece

5-a second sleeve body, 51-a second elastic sheet, 52-a second hook piece, 53-a third positioning bulge and 54-a third baffle body.

Detailed Description

The invention is described in detail below with reference to the figures and the specific embodiments. The front end in the present invention refers to the direction of the safety needle tip, while the back end refers to the opposite direction of the front end.

Example 1

As shown in fig. 1 to 16, the first safety needle of the present invention comprises a cap 1, a needle head member 2, a needle holder 3, a first sheath 4 and a second sheath 5. The needle member 2 has a needle body 21 and an inner plug 22.

As shown in figure 1: the cap (1) is a cylinder with one closed end and one open end, and the first sleeve body (4) and the second sleeve body (5) are hollow pipe bodies with one open ends. The rear end (1) of the cap is in sliding fit with the front end of the second sleeve body (5), the needle head piece (2) is fixedly arranged on the needle base (3), the first sleeve body (4) is in sliding fit with the second sleeve body (5), and meanwhile, the needle base (3) is in sliding fit with the first sleeve body (4). When the safety needle is assembled as shown in the attached figure 2, the cap (1) is sleeved on the outer surface of the second sleeve body (5), the first sleeve body (4) is embedded in the second sleeve body (5), and the needle base (3) is embedded in the first sleeve body (4), so that the needle body (21) is safely placed in the cap (1).

The diameter of the front end of the cap (1) is smaller than that of the rear end, and a plurality of bulges are arranged on the outer surface of the front end of the cap along the axial direction to achieve the anti-skid effect of pulling out the cap. The inner surface of the rear end of the cap (1) is in sliding fit with the bulge arranged on the outer surface of the front end of the second sleeve body (5) along the radial direction.

The needle head piece (2) comprises a needle body (21) and an inner plug (22), the needle body (21) and the inner plug (22) are integrally formed, and meanwhile, the needle head piece (2) is fixedly installed on the needle base (3).

As is clear from fig. 4: the outer surface of the front end of the second sleeve body (5) is provided with a plurality of vertical protrusions, so that friction force generated when the inner surface of the rear end of the cap (1) slides with the second sleeve body is increased, the cap (1) cannot easily slide off the surface of the second sleeve body, and the needle body is prevented from stabbing other people.

As shown in fig. 5: the outer surface of the first sleeve body (4) is provided with a fifth buckle groove (44), a second positioning bulge (43), a sixth buckle groove (45), a second slide way (46) and a fourth buckle groove (42) from the front end to the rear end in sequence. The outer surface of the first sleeve body (4) is also provided with a first elastic sheet (41), which is clearly shown in the attached figure 10: a first hook (48) is arranged below the first elastic sheet. The number of the fifth catching grooves (44), the number of the second positioning bulges (43), the number of the sixth catching grooves (45), the number of the second slide ways (46) and the number of the fourth catching grooves (42) are 2-4. As can be clearly seen from fig. 9, a second slide way (46) with a certain gradient is formed between the fourth catching groove (42) and the second positioning protrusion (43).

As shown in fig. 6: the needle seat (3) is provided with a second catching groove (33), a first positioning bulge (32), a third catching groove (34), a first slideway (35) and a first catching groove (31) along the outer surface in sequence. As will be apparent with reference to the description of figure 10: a first slide way (35) with an inclined slope is arranged between the first buckle groove (31) and the first lug boss (32). The rear end of the needle seat is provided with a first baffle body (36) along the outer periphery.

As can be seen from fig. 4 and 5: one surface of the first elastic sheet (41) is connected with the cylinder of the first sleeve body, the other three surfaces of the first elastic sheet are separated from the cylinder of the first sleeve body, and a second stopper (54) is formed at the lower end of the first elastic sheet relative to the cylinder of the first sleeve body. Meanwhile, one surface of the second elastic sheet (51) is integrally formed with the cylinder of the second sleeve body, and the other three surfaces of the second elastic sheet (52) are separated from the cylinder of the second sleeve body. The first elastic sheet (41) and the second elastic sheet (51) are provided with elastic sheets with certain width and length, and the elastic sheets can freely deform in the radial direction of the first sleeve body or the second sleeve body with certain margin under the action of stress.

A first hook piece (48) is arranged on the lower surface of each first elastic piece (41), and a second component (52) is arranged on the lower surface of each second elastic piece (51).

The cap (1) is a cylinder with one closed end and one open end, and the second sleeve body (5) and the first sleeve body (4) are hollow structures with two open ends. The front end diameter of block (1) is little, the block rear end diameter is big, sets up several vertical sand grips along block surface radial direction for in order to play the antiskid when pulling out the block.

In this embodiment, 2 first elastic pieces (41), 2 first hook pieces (48), 2 first hook grooves (31), 2 first positioning protrusions (32), 2 second hook grooves (33), 2 first slide ways (35), 2 second elastic pieces (51), 2 second hook pieces (52), 2 fourth hook grooves (42), 2 fifth hook grooves (44), 2 sixth hook grooves (45), 2 second positioning protrusions (43) and 2 second slide ways (46).

The inclined angle a of the front end of the fourth buckle groove (42) is more than or equal to the inclined angle b of the front end of the second hook piece (52); the inclined angle c of the rear end of the fourth catching groove (42) is less than or equal to the inclined angle d of the rear end of the second hook piece (52); the inclination angle e of the fifth catching groove (44) is less than or equal to the inclination angle f of the tail end of the second hook (52), and the inclination angle g formed at the front end of the sixth catching groove (45) is less than or equal to the inclination angle h of the front end of the third retainer (54); the inclination angle j of the second catching groove (33) is less than or equal to the inclination angle i of the tail end of the first member (48), and the inclination angle l of the front end of the third catching groove (34) is less than or equal to the inclination angle k of the front end of the second blocking body (47).

When the safety needle is not opened, the first hook (48) under the first elastic sheet (41) of the first sleeve body (1) is correspondingly buckled into the first buckling groove (31) of the needle base (3), and similarly, the second hook (52) of the second sleeve body (5) is correspondingly buckled into the fourth buckling groove (42) of the first sleeve body (4), so that the safety needle structure is in an initial light locking state. However, under the action of force, the first member (48) slides out of the first buckling groove (31) and the second member (52) slides out of the fourth buckling groove (42), and at the moment, the cap is pulled out, so that the injection needle can be used.

The front end slope angles of the first catching groove (31) and the third catching groove (33) are set so that the first hook piece (41) can be lightly locked on the first catching groove (31) and can relatively easily slide along the first slide way (35), and the second hook piece (52) can be lightly locked on the fourth catching groove (42) and can relatively easily slide along the second slide way (46), so that the stretching and locking purposes can be achieved with smaller force.

After the injection is finished, the second sleeve body (5) can be firstly pulled lightly, the first hook piece (52) with a certain inclination on the lower surface of the second elastic sheet (51) arranged on the second sleeve body (5) slides out of the fourth buckling groove (43) with a certain inclination on the upper surface of the first elastic sheet (41) arranged on the first sleeve body (4), and moves forwards along the second slide way (46), passes through the sixth buckling groove (45) and moves to the second positioning protrusion (43) with a certain inclination. The second elastic sheet (51) moves upwards with a certain margin due to the second positioning protrusion (43), and meanwhile, the second elastic sheet has the action force of rebounding downwards. When the second member (51) moves to reach the fifth catching groove (45), the second hook (52) at the lower end of the second elastic sheet (51) is caught in the fifth catching groove (45) under the action of the downward resilience force of the second elastic sheet; meanwhile, the third blocking body (54) is abutted against the second positioning bulge (43) of the first sleeve body, so that the second sleeve body and the first sleeve body are in a locking state. Then, the first sleeve body (4) is pulled forwards along the needle point direction, the process is the same as the process of pulling the second sleeve body (5), namely, the first hook piece (48) arranged on the lower surface of the first elastic piece (41) slides out of the first buckling groove (31) with a certain slope of the needle base, and the first hook piece (42) is buckled into the second buckling groove (33) through the first slide way (35) and the first positioning bulge (32) with a certain slope, and meanwhile, the second blocking body (47) of the first sleeve body cannot move forwards under the resistance action of the first positioning bulge (32). Therefore, the first sleeve body and the second sleeve body can not move forwards or backwards, and the needle body is locked in the hollow cavities of the first sleeve body and the second sleeve body to form a safety needle structure. The safety needle has simple structure and strong operability, and the used needle body can be safely and stably locked in the space between the first sleeve body and the second sleeve body only by small force after the safety needle is used.

Example 2

See the description of figures 16-23. Another safety needle comprises a cap (1), a needle head piece (2), a needle seat (3) and a second sleeve body (5). The needle head piece (2) is provided with a needle body (21) and an inner plug (22), and the needle body (21) and the inner plug (22) are integrally formed.

The cap (1) is in sliding fit with the second sleeve body (5), the needle head piece (2) is fixedly arranged on the needle seat (3), and the needle seat (3) is in sliding fit with the second sleeve body (5).

The diameter of the front end of the cap (1) is smaller than that of the rear end, and a plurality of bulges are arranged on the outer surface of the front end of the cap along the axial direction to achieve the anti-skid effect of pulling out the cap. The inner surface of the rear end of the cap is in sliding fit with the protrusion arranged on the outer surface of the second sleeve body along the radial direction.

The outer surface of the needle base (3) is sequentially provided with a second catching groove (33), a first positioning protrusion (32), a third catching groove (34), a first slide way (35) and a first catching groove (31) from the front end to the rear end, and at least one of the second catching groove (33), the first positioning protrusion (32), the third catching groove (34), the first slide way (35) and the first catching groove (31) is arranged;

the second sleeve body (5) is provided with a third positioning bulge (53), at least one second elastic sheet (51), a third baffle body (54) and a plurality of vertical surface bulges (55); the lower surface of each second elastic sheet (51) is provided with a second hook piece (52);

the inclination angle f of the rear end of the second hook (51) is more than or equal to the inclination angle g of the rear end of the second catching groove (33), and the inclination angle h of the front end of the third stopper (54) is more than or equal to the inclination angle l of the front end of the third catching groove (34).

As will be apparent with reference to the description of figure 17: a first slide way (35) is formed between a first buckle groove (31) and a first positioning bulge (32) of the needle base (3), a first blocking body (36) is arranged at the rear end of the needle base (3) along the outer periphery, and the number of the second buckle groove (33), the first positioning bulge (32), the third buckle groove (34), the first slide way (35) and the first buckle groove (31) is 2, and the first buckle groove (31) is arranged on the outer surface of the needle base at intervals.

The outer surface of the front end of the second sleeve body (5) is provided with a plurality of vertical bar surface bulges for increasing the surface friction force. So that the cap (1) can not easily fall off from the surface of the second sleeve body (5). The outer surface of the second sleeve body (5) is provided with a circle of second positioning protrusions (53) with a certain width, the outer surface of the second sleeve body (5) is provided with transverse strip-shaped convex strips (55) and second elastic strips (51) at intervals, the lower surface of each second elastic strip (51) is also provided with a second member (52), and the outer surface of the rear end of the second sleeve body (5) is provided with a third blocking body (54) along the radial direction.

The second elastic sheet (51) and the second sleeve body (5) are integrally formed, one surface of the second elastic sheet is connected with the second sleeve body (5), the other three surfaces of the second elastic sheet are not connected with the second sleeve body, so that the elastic sheet with certain width and length is formed, and the elastic sheet can freely deform in the radial direction of the first sleeve body or the second sleeve body with certain margin under the action of stress.

Lid (1) rear end internal surface passes through sliding fit with second cover body (5) front end surface, and the surface of this lid sets up many surperficial archs, makes things convenient for medical personnel to take.

In this embodiment, the first catching groove (31), the first positioning protrusion (32), the second catching groove (33), the third catching groove (34), the first sliding way (35), the second elastic sheet (51) and the second hook (52) are all arranged in 2 at intervals.

When the safety needle is not opened, the second hook (52) of the second sleeve body (5) is correspondingly buckled into the first buckling groove (31) of the needle seat (3), so that the safety needle structure is in an initial light locking state. However, under the action of force, the second component (52) slides out of the first buckle groove (31), and at the moment, the cap is only required to be pulled out, so that the injection needle can be used.

The front end inclination angle setting of first catching groove and third catching groove can lightly lock in the spout can slide along first slide easily relatively at the hook, and the resistance that first component slided when having the first location bellying of slope is less simultaneously, reaches to reach tensile lock solid purpose with littleer power.

After the injection is finished, the second sleeve body (5) can be pulled lightly, the first hook piece (52) with a certain inclination on the lower surface of the second elastic sheet (51) of the second sleeve body (5) slides out of the first buckle groove (31) of the needle seat (3), moves forwards along the first slide way (35), passes through the third buckle groove (34) and moves to the first positioning protrusion (32) with a certain inclination. The second elastic sheet (51) moves upwards with a certain margin due to the first positioning protrusion (32), and meanwhile, the second elastic sheet has the action force of rebounding downwards. When the second member (52) moves to reach the second catching groove (33), the second hook (52) at the lower end of the second elastic sheet (51) is caught in the second catching groove (33) under the action of the downward resilience force of the second elastic sheet; meanwhile, the third baffle (54) is resisted with the first positioning bulge (32) of the needle seat, so that the second sleeve and the needle seat are in a locking state. Therefore, the second sleeve body can not move forwards or backwards, and the needle body is locked in the hollow cavity of the second sleeve body to form a safety needle structure. The safety needle has simple structure and strong operability, and the used needle body can be safely and stably locked in the space between the first sleeve body and the second sleeve body only by small force after the safety needle is used.

The two safety needle structures of the invention can be directly implemented in an injection syringe or a negative pressure type blood sampling syringe.

The foregoing description is further illustrative of the present invention with reference to the following detailed description and accompanying drawings. It will be evident, however, to one skilled in the art that the present invention may be practiced in many other ways than those specifically set forth herein, and that the present invention may be practiced in many different ways that will vary from the specific embodiments described above without departing from the spirit and scope of the present invention.

Claims

1. A safety needle, characterized by: the safety needle comprises a cap (1), a needle head piece (2), a needle base (3), a first sleeve body (4) and a second sleeve body (5);

the cap (1) is in sliding fit with the second sleeve body (5), the needle head piece (2) is fixedly arranged on the needle base (3), the first sleeve body (4) is in sliding fit with the needle base (3), and the second sleeve body (5) is in sliding fit with the first sleeve body (4);

the second sleeve body (5) is provided with a third positioning bulge (53), a second elastic sheet (51) and a third baffle body (54); a second hook piece (52) is arranged on the lower surface of each second elastic piece (51); a third positioning bulge (53) is arranged on the outer surface of the second sleeve body (5) along the circumference;

the first sleeve body (4) is provided with a first elastic sheet (41), a fifth buckle groove (44), a second positioning bulge (43), a sixth buckle groove (45), a fourth buckle groove (42), a second slide way (46) and a second blocking body (47); the lower surface of each first elastic sheet (41) is provided with a first hook piece (48);

the needle seat (3) is provided with a first catching groove (31), a first positioning bulge (32), a second catching groove (33), a third catching groove (34), a first slide way (35) and a first blocking body (36);

the inclined angle a of the front end of the fourth catching groove (42) is more than or equal to the inclined angle b of the front end of the second hook (52); the inclination angle c of the rear end of the fourth catching groove (42) is less than or equal to the inclination angle d of the rear end of the second hook piece (52); the inclination angle e of the fifth catching groove (44) is less than or equal to the inclination angle f of the tail end of the second hook (52), and the inclination angle g formed at the front end of the sixth catching groove (45) is less than or equal to the inclination angle h of the front end of the third retainer (54); the inclination angle j of the second catching groove (33) is not more than the inclination angle i of the tail end of the first hook (48), and the inclination angle l of the front end of the third catching groove (34) is not more than the inclination angle k of the front end of the second stopper (47).

2. The safety needle according to claim 1, wherein: the needle head piece (2) comprises a needle body (21) and an inner plug (22), and the needle body (21) and the inner plug (22) are integrally formed; the outer surface of the rear end of the second sleeve body (5) is provided with a plurality of vertical surface bulges (55) along the circumferential direction, and the number of the second elastic sheets (51) is at least one.

3. The safety needle according to claim 1, wherein: the first sleeve body (4) is provided with a fifth buckle groove (44), a second positioning protrusion (43), a sixth buckle groove (45), a second slide way (46) and a fourth buckle groove (42) in sequence from the front end to the rear end, the first elastic sheet (41) and the second slide way (46) are arranged at intervals, and at least one of the fifth buckle groove (44), the second positioning protrusion (43), the sixth buckle groove (45), the second slide way (46), the fourth buckle groove (42) and the first elastic sheet (41) is arranged.

4. The safety needle according to claim 1, wherein: the outer surface of the needle seat (3) is sequentially provided with a second catching groove (33), a first positioning protrusion (32), a third catching groove (34), a first slide way (35) and a first catching groove (31) from the front end to the rear end, and at least one of the second catching groove (33), the first positioning protrusion (32), the third catching groove (34), the first slide way (35) and the first catching groove (31) is arranged.

5. A method of using the safety needle of any one of claims 1~4 wherein:

opening the cap (1), when the second sleeve body (5) is stretched forwards along the outer periphery of the first sleeve body (4), the second hook piece (52) slides out of the fourth buckling groove (42), the second hook piece (52) moves forwards along the second slide way (46) to the second positioning protrusion (43), and when the second hook piece (52) moves to the tail end of the second protrusion part, the second hook piece (51) is buckled downwards into the fifth buckling groove (44) under the action of elastic force, and at the moment, the second sleeve body is locked with the first sleeve body; meanwhile, the first sleeve body (4) moves forwards along the needle base (3), the first hook piece (48) slides out of the first buckling groove (31) and slides along the first slide way (35), when the first hook piece moves forwards to the first positioning protrusion (32), the tail end of the first positioning protrusion (32) enables the first hook piece (48) of the first elastic sheet (41) to be downwards buckled into the second buckling groove (33) under the action of elastic force, and at the moment, the first sleeve body (4) is locked with the needle base (3).

6. A safety needle characterized by: the safety needle comprises a cap (1), a needle head piece (2), a needle base (3) and a second sleeve piece (5);

the cap (1) is in sliding fit with the second sleeve body (5), the needle head piece (2) is fixedly arranged in the needle seat (3), and the needle seat (3) is in sliding fit with the second sleeve body (5);

the needle head piece (2) comprises a needle body (21) and an inner plug (22), and the needle body (21) and the inner plug (22) are integrally formed;

the outer surface of the needle seat (3) is sequentially provided with a second catching groove (33), a first positioning bulge (32), a third catching groove (34), a first slide way (35) and a first catching groove (31) from the front end to the rear end, and at least one of the second catching groove (33), the first positioning bulge (32), the third catching groove (34), the first slide way (35) and the first catching groove (31) is arranged;

the second sleeve body (5) is provided with a third positioning bulge (53), at least one second elastic sheet (51), a third baffle body (54) and a plurality of vertical surface bulges (55); the lower surface of each second elastic sheet (51) is provided with a second hook piece (52); a third positioning bulge (53) is arranged on the outer surface of the second sleeve body (5) along the circumference;

the inclination angle f of the rear end of the second hook (52) is larger than or equal to the inclination angle g of the rear end of the second catching groove (33), and the inclination angle h of the front end of the third stopper (54) is larger than or equal to the inclination angle l of the front end of the third catching groove (34).

7. A method of using the safety needle of claim 6, wherein:

the cover cap (1) is opened, the second sleeve body (5) moves forwards along the needle seat (3), the second hook piece (52) slides out of the first buckling groove (31) and slides to the first positioning bulge (32) along the first slide way (35), then the second hook piece (52) of the second elastic sheet (51) is downwards buckled into the second buckling groove (33) by continuously moving to the tail end of the second bulge, and at the moment, the second sleeve body is locked with the needle seat.

8. The safety needle of any one of claims 1~7 for use in a syringe or a blood collection syringe.