CN217091674U

CN217091674U - Puncture-proof syringe

Info

Publication number: CN217091674U
Application number: CN202123289438.0U
Authority: CN
Inventors: 易利娜; 罗小波; 万梓铭; 华洁; 张灿; 杨丹琳
Original assignee: University of South China
Current assignee: University of South China
Priority date: 2021-12-25
Filing date: 2021-12-25
Publication date: 2022-08-02
Anticipated expiration: 2031-12-25

Abstract

The puncture-proof syringe comprises a needle tube, a push-pull rod, a needle seat, a needle head and a needle sleeve; a normal connection state and a destruction connection state exist between the needle sleeve and the needle seat; under the normal connection state, the needle sleeve is sleeved into the needle head and the needle seat through the opening and is in screwed fit with the external thread of the needle seat through the internal thread, and the two buckles of the needle sleeve are respectively opposite to the two ports of the groove of the needle seat; in the destroying connection state, the needle sleeve is sleeved into the needle head and the needle seat through the opening, the internal thread of the needle sleeve integrally crosses the external thread of the needle seat or partially crosses the external thread of the needle seat, and the internal thread of the needle sleeve is clamped into the two ports of the groove of the needle seat through the two buckles respectively. The utility model discloses the advantage lies in, the mode of the installation of needle cover and taking off is become "screw in screw out" by traditional "pulling out to insert", only needs provide radial revolving force when taking off the needle cover, and need not drag hard, and hand resilience when effectively having avoided extracting the needle cover causes the acupuncture wound.

Description

Puncture-proof syringe

Technical Field

The utility model relates to the technical field of medical supplies, in particular to a puncture-proof injector.

Background

The syringe is a common medical product, and the syringe has the risk of needle stick injury in the use process, and the needle stick injury is the most main way to cause occupational infection, and with the infection rate of blood-borne diseases rising continuously in recent years, it is very important to pay attention to and prevent the needle stick injury.

The structure of the prior injector is shown in figures 9-11, which comprises a syringe 6, a piston rod 7, a coupling seat 8, a needle head and a needle cap 9; an inner cavity for containing liquid medicine is arranged in the needle cylinder 6, one end of the needle cylinder 6 is provided with a mounting opening, and the other end is provided with a liquid medicine outlet; one end of the piston rod 7 is movably arranged in the inner cavity of the needle cylinder 6 through the mounting port, and the other end is exposed outside the needle cylinder 6; a liquid medicine channel is arranged in the connecting seat 8, a connecting port A and a connecting port B81 are respectively formed at the two ends of the connecting seat 8 by the liquid medicine channel, and the connecting seat 8 is inserted on the liquid medicine outlet of the needle cylinder 6 through the connecting port A; the needle is inserted into the connecting port B81 of the connecting seat 8; the needle cap 9 is internally provided with a cavity for containing the needle head, one end of the needle cap 9 is provided with an opening, the other end is closed, and the needle cap 9 is detachably sleeved on the connecting seat 8 and contains the needle head.

The prior injector has the following defects in the actual use process:

1. the extraction of the needle cap 9 is a high-risk operation that causes needle stick injuries, and the outer wall of the coupling seat 8 is provided with a ring of elastic convex rings A82, and correspondingly, the inner wall of the needle cap 9 near the open end is provided with a ring of elastic convex rings B91. When the needle cap 9 is in the connected state with the coupling seat 8, the elastic convex ring B91 of the needle cap 9 entirely goes over the elastic convex ring A82 of the coupling seat 8, so that the needle cap 9 is not separated from the coupling seat 8. When the needle cap 9 is pulled out, an axial force (parallel to the needle head direction) needs to be applied to pull the needle cap 9 out of the connecting seat 8, in the process, the elastic convex ring B91 of the needle cap 9 integrally crosses the elastic convex ring A82 of the connecting seat 8, if the force is too small, the needle cap 9 cannot be pulled out, and if the force is too large, a hand for taking the needle cap 9 can be bounced back after the needle cap 9 is pulled out, so that the needle stick injury is easily caused.

2. The back-cover needle cap 9 is a high-risk operation causing needle stick injuries, and if the back-cover needle cap 9 is used by two hands (one hand is used for holding the syringe and the other hand is used for holding the needle cap), the needle point is easy to stick on the hand due to misalignment. Currently, medical care personnel are required to back-sleeve the needle cap with one hand in the medical industry to avoid needle stick injuries, namely, the needle cap 9 is firstly placed on a plane, then the syringe is held with one hand, and the needle point is inserted into the needle cap 9. On the one hand, current needle cap 9 design all is the cylinder appearance, and needle cap 9 is put and is rolled easily (be difficult to the location) on the plane, and the one-hand looper operation of not being convenient for, on the other hand, does not have obvious sign guide design on the needle cap 9, has visual error during the one-hand looper needle cap 9, and the syringe needle is difficult to aim at the uncovered of needle cap 9.

3. In some use scenes, the needle cylinder 6 needs to be used independently for pushing or drawing medicines, or the needle needs to be replaced due to damaged needle, at this time, the connecting seat 8, the needle and the needle cap 9 need to be pulled out together, but the width of the side wall surface at the lower end of the connecting seat 8 is usually less than 5mm, the force application surface is too small, when the connecting seat 8, the needle and the needle cap 9 are pulled out, most areas of fingers can be pressed on the needle cap 9, misoperation is easy to occur, and only the needle cap 9 needs to be pulled out independently.

4. The syringe needle needs to be destroyed in time after being used so as to avoid needle stick injuries during garbage disposal and illegal personnel picking up and recycling.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the not enough of prior art, and provide a prevent stabbing syringe, it has solved the current syringe one hand and has returned the cover needle cap degree of difficulty big, have the stabbing risk when extracting the needle cap, will connect seat, syringe needle and needle cap and pull out the problem that has certain degree of difficulty, need rely on sharp ware box to destroy the syringe needle together.

The technical scheme of the utility model is that: the puncture-proof syringe comprises a needle tube, a push-pull rod, a needle seat, a needle head and a needle sleeve;

an inner cavity for containing liquid medicine is arranged in the needle tube, one end of the needle tube is provided with a filling port, and the other end of the needle tube is provided with a liquid medicine outlet;

one end of the push-pull rod is movably arranged in the inner cavity of the needle tube through the filling port, the other end of the push-pull rod extends out of the needle tube, and the push-pull rod moves along the inner cavity of the needle tube so as to expand or reduce the volume of the inner cavity of the needle tube;

the needle base is internally provided with a liquid medicine channel, the liquid medicine channel respectively forms a connector C and a connector D at the front end and the rear end of the needle base, the needle base is sequentially provided with a finger grabbing part, a needle sleeve connecting part and a needle head connecting part from the front end to the rear end, the finger grabbing part is provided with two acting surfaces and two buckling surfaces, the two acting surfaces and the two buckling surfaces are respectively symmetrically arranged relative to the central line of the needle base, and each buckling surface is provided with a pit; the needle sleeve connecting part is provided with an external thread;

one end of the needle head is inserted into the liquid medicine channel of the needle seat through the connecting port D and is positioned in the needle head connecting part of the needle seat, and the other end of the needle head extends out of the connecting port D;

the needle sleeve is internally provided with an inner cavity for accommodating the needle head, one end of the needle sleeve is provided with an opening, the other end of the needle sleeve is closed, the wall surface of the inner cavity of the needle sleeve is provided with an internal thread at one end close to the opening, and the edge of the needle sleeve at the opening end is provided with two oppositely arranged buckles;

a normal connection state and a destruction connection state exist between the needle sleeve and the needle seat; in a normal connection state, the needle sleeve is sleeved into the needle head and the needle seat through the opening and is in threaded fit with the external thread of the needle seat through the internal thread, and the two buckles of the needle sleeve are respectively opposite to the two pits of the needle seat; in the destroying connection state, the needle sleeve is sleeved into the needle head and the needle seat through the opening, the internal thread of the needle sleeve integrally crosses the external thread of the needle seat or partially crosses the external thread of the needle seat, and the internal thread of the needle sleeve is clamped into two pits of the needle seat through two buckles respectively.

The utility model discloses further technical scheme is: the needle sleeve expands in size at one end close to the opening to form a positioning part, a positioning surface is arranged on the positioning part, a plurality of positioning edges are uniformly distributed on the outer circular surface close to the closed end of the needle sleeve in an annular mode, and the positioning edges are arranged in parallel to the axial direction of the needle sleeve; a step surface is formed between the positioning part and the needle sleeve main body, and when the needle sleeve is placed on a plane, the positioning surface and the positioning edge jointly provide support and cannot rotate.

The utility model discloses still further technical scheme is: the bottom surface of the closed end in the inner cavity of the needle sleeve is provided with a solid boss which is cylindrical and extends towards the open end in the inner cavity of the needle sleeve; when the needle sleeve and the needle seat are in a normal connection state, the needle head is not contacted with the solid boss; when the needle sleeve and the needle base are in a destroying connection state, the needle head is inserted into the solid boss.

The utility model discloses a further technical scheme is: the internal thread of the needle sleeve and the external thread of the needle seat are double-thread pipe threads with the same parameters, the thread form of the pipe threads is an isosceles triangle, the thread form angle a =55 degrees, the thread crest is provided with a fillet, the thread stroke is 4mm, and the thread pitch is 2 mm.

Compared with the prior art, the utility model have following advantage:

1. the mode of the installation and taking off of needle cover is changed into "screw in and unscrew" by traditional "pulling out and inserting", only need provide radial revolving force when taking off the needle cover, and need not pull hard, hand resilience when effectively having avoided extracting the needle cover and cause the acupuncture wound.

2. When the needle cover was put on the plane, on the one hand provided the support jointly through the locating surface and the location arris that are located needle cover both ends, can't rotate, and on the other hand the open end of needle cover presents slight tilt up's gesture, and the location portion of needle cover expands for needle cover main part size on the other hand again, provides obvious vision and guides, is convenient for carry out the operation that the one-hand back sleeved needle was covered.

3. The needle file front end is equipped with the finger that can supply the finger to place and attach power and grasps the portion of holding between the fingers, places on two are attaching force faces of finger portion of holding between the fingers when two fingers of user to axial application of force is dragged, can wholly take off needle file, syringe needle and needle cap, can not take place the phenomenon of mistake needle cover of getting.

4. Need not to use sharp ware box can carry out the self-destruction, can form triple after the self-destruction and link firmly the guarantee, on the one hand, the needle cover is crossed by force and is destroyed the external screw thread of needle file, and the screw thread atress warp has formed the locking structure of mutual gomphosis promptly, and on the other hand, during the syringe needle point-end inserts the solid boss of needle cover, on the other hand again, two buckles on the needle cover block respectively in the just right pit on the needle file. The needle seat, the needle head and the needle sleeve are fixedly connected into a whole through triple fixedly-connecting guarantee, mutual separation is difficult, the needle head cannot be used at a high probability even after forced separation, and the needle head is effectively prevented from being punctured and reused by lawless persons when being treated.

5. The connection mode of the needle seat and the needle sleeve adopts non-sealing pipe threads, the tooth form is isosceles triangle, the tooth form angle alpha =55 degrees, and the tooth top has a fillet, so that the needle sleeve can be ensured to be repeatedly used, and the threads can be conveniently destroyed when the needle head is destroyed. During the process of screwing the needle seat and the needle sleeve, the connection tightness can be ensured by utilizing the deformation of the thread, and the complete sealing is not required in the design. Considering not needing very big power when destroying the screw thread, the convenient and fast screws up in the needle cap used repeatedly process again, all designs the stroke of internal thread and external screw thread to 4mm, and the pitch adopts 2mm, double thread, dextrorotation, two circles.

The invention is further described below with reference to the figures and examples.

Drawings

FIG. 1 is a schematic structural view of the needle hub and the needle base in a normal connection state;

FIG. 2 is a schematic structural view of the needle guard and needle seat destruction connection state of the present invention;

FIG. 3 is a schematic structural view of the present invention in a state where the needle cap is separated from the needle base;

FIG. 4 is a schematic view of the structure of the needle mount at one viewing angle;

fig. 5 is a structural schematic view of the needle seat at another view angle;

FIG. 6 is a schematic view of the needle hub from one perspective;

FIG. 7 is a schematic view of the needle hub from another perspective;

FIG. 8 is a cross-sectional view A-A of FIG. 7;

FIG. 9 is a schematic structural view of a prior art syringe;

FIG. 10 is a schematic view of the structure of the needle cap;

fig. 11 is a schematic structural view of the connecting seat.

Illustration of the drawings: a needle tube 1; a push-pull rod 2; a needle seat 3; a finger grip 31; an acting surface 311; a fastening surface 312; a pit 313; a needle hub connection 32; external threads 321; a needle head connecting portion 33; a connection port C34; a connection port D35; a needle 4; a needle hub 5; an internal thread 51; a buckle 52; a positioning portion 53; a positioning rib 54; a step surface 55; a solid boss 56; a needle cylinder 6; a piston rod 7; a coupling seat 8; elastic convex ring A82; a needle cap 9; elastic convex ring B91.

Detailed Description

Example 1:

as shown in fig. 1-8, the puncture-proof injector comprises a needle tube 1, a push-pull rod 2, a needle seat 3, a needle 4 and a needle sleeve 5.

The needle tube 1 is internally provided with an inner cavity for containing liquid medicine, one end of the needle tube 1 is provided with a filling port, and the other end is provided with a liquid medicine outlet.

One end of the push-pull rod 2 is movably arranged in the inner cavity of the needle tube 1 through the filling port, the other end of the push-pull rod is exposed outside the needle tube 1, and the push-pull rod 2 moves along the inner cavity of the needle tube 1 to enlarge or reduce the volume of the inner cavity of the needle tube 1.

A liquid medicine channel is arranged in the needle seat 3, the liquid medicine channel forms a connecting port C34 and a connecting port D35 at the front end and the rear end of the needle seat 3 respectively, the needle seat 3 is sequentially provided with a finger-gripping part 31, a needle sleeve connecting part 32 and a needle head connecting part 33 from the front end to the rear end, the finger-gripping part 31 is provided with two force surfaces 311 and two buckling surfaces 312, the two force surfaces 311 and the two buckling surfaces 312 are symmetrically arranged relative to the central line of the needle seat 3 respectively, and each buckling surface 312 is provided with a pit 313. The needle hub portion 32 is provided with external threads 321.

One end of the needle 4 is inserted into the liquid medicine channel of the needle seat 3 through the connecting port D35 and is positioned in the needle connecting part 33 of the needle seat 3, and the other end extends out of the connecting port D35.

The needle sleeve 5 is internally provided with an inner cavity for accommodating a needle, one end of the needle sleeve 5 is provided with an opening, the other end of the needle sleeve 5 is closed, the wall surface of the inner cavity of the needle sleeve 5 is provided with an internal thread 51 near the open end, and the edge of the needle sleeve 5 at the open end is provided with two oppositely arranged buckles 52.

A normal connection state and a destruction connection state exist between the needle hub 5 and the needle mount 3. Under the normal connection state, the needle sleeve 5 is sleeved in the needle 4 and the needle seat 3 through the opening and is in screwed fit with the external thread 321 of the needle seat 3 through the internal thread 51, and the two buckles 52 of the needle sleeve 5 are respectively opposite to the two pits 313 of the needle seat 3. In the destruction connection state, the needle sheath 5 is sleeved into the needle 4 and the needle seat 3 through the opening, the internal thread 51 of the needle sheath 5 wholly passes over the external thread 321 of the needle seat 3 or partially passes over the external thread 321 of the needle seat 3, and is respectively clamped into the two pits 313 of the needle seat 3 through the two buckles 52.

Preferably, the finger grip 31, the needle hub connection 32 and the needle hub connection 33 of the needle mount 3 are successively reduced in radial dimension.

Preferably, the needle sheath 5 expands in size at one end near the opening to form a positioning portion 53, the positioning portion 53 is provided with a plurality of positioning surfaces connected in sequence, a plurality of positioning ribs 54 are uniformly distributed on the outer circular surface of the needle sheath 5 near the closed end in an annular manner, and the positioning ribs 54 are arranged in parallel to the axial direction of the needle sheath 5. The detent 53 forms a stepped surface 55 with the body of the sleeve 5 which, when the sleeve 5 is placed on a flat surface, provides support by the detent surface and the detent rib 54 together and cannot rotate.

Preferably, the bottom surface of the closed end in the interior cavity of the sleeve 5 is provided with a solid boss 56, the solid boss 56 being cylindrical and extending towards the open end in the interior cavity of the sleeve 5. When the needle sleeve 5 and the needle seat 3 are in a normal connection state, the needle 4 is not in contact with the solid boss 56. When the needle hub 5 is in a destroyed connection with the needle mount 3, the needle 4 is inserted into the solid boss 56.

Preferably, the internal thread 51 of the needle sleeve 5 and the external thread 321 of the needle seat 3 are double-thread pipe threads with the same parameters, the thread form of the pipe thread is an isosceles triangle, the thread form angle a =55 °, the thread crest is provided with a round angle, the thread stroke is 4mm, and the thread pitch is 2 mm.

Preferably, the axial width of the force application surface 311 of the finger grip 31 of the needle holder 3 is 1.5 cm.

A syringe self-destruction method is applied to the anti-puncture syringe and comprises the following steps: the needle sleeve 5 is sleeved into the needle 4 and the needle seat 3 through the opening, and two buckles 52 of the needle sleeve 5 are ensured to be respectively opposite to two pits 313 of the needle seat 3. After the internal thread 51 of the needle sleeve 5 is contacted with the external thread 321 of the needle base 3, the step surface 55 of the needle sleeve 5 is pressed forcibly, so that the needle sleeve 5 passes over and breaks the external thread 321 of the needle base 3, and finally, the two buckles 52 are respectively clamped into the respective opposite concave pits 313 on one hand, and the needle 4 is inserted into the solid boss 56 on the other hand.

Claims

1. Prevent stabbing syringe, characterized by: comprises a needle tube, a push-pull rod, a needle seat, a needle head and a needle sleeve;

2. A puncture resistant syringe as set forth in claim 1, wherein: the needle sleeve expands in size at one end close to the opening to form a positioning part, a positioning surface is arranged on the positioning part, a plurality of positioning edges are uniformly distributed on the outer circular surface close to the closed end of the needle sleeve in an annular mode, and the positioning edges are arranged in parallel to the axial direction of the needle sleeve; a step surface is formed between the positioning part and the needle sleeve main body, and when the needle sleeve is placed on a plane, the positioning surface and the positioning edge jointly provide support and cannot rotate.

3. A puncture resistant syringe as set forth in claim 2 wherein: a solid boss is arranged on the bottom surface of the closed end in the inner cavity of the needle sleeve, is cylindrical and extends towards the open end in the inner cavity of the needle sleeve; when the needle sleeve and the needle seat are in a normal connection state, the needle head is not contacted with the solid boss; when the needle sleeve and the needle base are in a destroying connection state, the needle head is inserted into the solid boss.

4. A puncture resistant syringe according to any one of claims 1 to 3, wherein: the internal thread of the needle sleeve and the external thread of the needle seat are double-thread pipe threads with the same parameters, the thread form of the pipe threads is an isosceles triangle, the thread form angle a =55 degrees, the thread crest is provided with a fillet, the thread stroke is 4mm, and the thread pitch is 2 mm.