CN2193166Y

CN2193166Y - Safety injector

Info

Publication number: CN2193166Y
Application number: CN 94207382
Authority: CN
Inventors: 徐柏龄
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-03-29
Filing date: 1994-03-29
Publication date: 1995-03-29
Anticipated expiration: 2004-03-29

Abstract

The utility model relates to a safety injector. The outside of a liquid medicine barrel is mainly sheathed with a safety protection barrel which can be actively pushed to hide an injection needle head in the safety protection barrel duly, the injection needle head is not revealed, and thus the matter of accidental infection caused by other people are wrong thrust can be prevented. Ring grooves and convex rings are respectively arranged on the bottom edge of the outer wall and the position approach to the front end of the liquid medicine barrel, and convex granular bodies and inner ring grooves connected, clamped and positioned corresponding to the ring grooves and the convex rings are respectively arranged on the bottom edge of the inner wall and the adjacent position of the safety protection barrel. The utility model has the advantages of very simple overall structure and convenient operation. The safe utilization of an injector can be ensured.

Description

Safety injector

This utility model relates to a kind of safety injector, does not expose the safety injector that reaches the safeguard protection purpose thereby relate generally to before use a kind of and injection needle hidden firmly not make after use.

Conventional syringe comprises a cartridge, a plunger and an injection needle.Plunger is located in the cartridge, and front end is provided with can push medicinal liquid the close chock plug of the liquid that enters injection needle.Injection needle is combined with pinhead sleeve joint endways, to engage with the syringe needle junction surface of cartridge front end.Usually a sheathed pinhead sleeve on injection needle is not before using or inject all this pinhead sleeve to be enclosed within after finishing and protected on the injection needle or abandon.Owing to pinhead sleeve must form the elongate sheath tubular corresponding to injection needle, so usually occur in the inaccurate situation of consequently stabbing staff of cover when injecting back shroud injection needle.Also might after injection, miss the situation of stinging others by user because of managing careless touching.Therefore, general medical personnel are often feeling greatly uneasy and frightened for suffering from when high risk or infectious disease patient provide the injection service, in case slightly mistake is stabbed, its consequence is often made us and can't be expected, the AIDS that spreads especially at present can cause infecting by the blood contact.Be that safety guarantee with medical personnel very is short of, make us dark for worried.

Main purpose of the present utility model be to provide a kind of before injection and after the injection can both with injection needle reliably the enclosure live with prevent injection needle accidentally injure others, simple in structure and safe and reliable safety injector.

The purpose of this utility model can realize by following technical scheme.Safety injector of the present utility model comprises a cartridge, a plunger, an injection needle and a pinhead sleeve, plunger is used to stretch into interior medicinal liquid is pushed of cartridge and enters injection needle, injection needle is installed in the cartridge front end and is covered by pinhead sleeve, cartridge is provided with an annular groove on the outer wall of the bottom of cylindrical shell, on outer wall, be provided with the twice bulge loop near barrel front end, before cartridge, be formed with its diameter awl column base bigger, make this awl column base form a step in the bottom than the diameter of cylindrical shell; Be arranged with a safe casing in the cartridge outside, the external diameter of the awl column base of its barrel diameter and cartridge is corresponding, its stack shell inwall be provided with on the root edge a plurality of to projecting inward, engage with annular groove on the cartridge and to form card and end localized protruding granular body, its stack shell inwall is provided with twice and blocks with the corresponding joint formation of twice bulge loop of cartridge and end localized inner groove on the appropriate location of contiguous protruding granular body; Engage with bulge loop on the cartridge by the inner groove on the safety casing and to form card fastening position, guarantee that safe casing is being collected in injection needle fully in the safe casing and will not exposing after outwards passing.

Further feature of the present utility model is described below.The inner groove of safe casing and the bulge loop of cartridge can correspondence be arranged to more than two.Safe casing can be provided with the anti-skidding convex tendon of the adjacent setting of multiple tracks at the outer wall suitable position.Safe casing can be formed with the internal projecting ring to prevent safe casing to come off from cartridge on the bottom stage that is stuck in cartridge front end awl column base when the safety casing is outwards passed to the end between two inner grooves.Safe casing can be formed with the corresponding taper reducing of taper portion of the awl column base of a wimble fraction in it and cartridge front end at its front end.

Conjunction with figs. describes embodiment of the present utility model in detail below.In the accompanying drawings:

Fig. 1 is an assembled perspective view of the present utility model, and part breaks with bag member in illustrating;

Fig. 2 is the transverse sectional view of safe casing of the present utility model;

Fig. 3 is the longitudinal sectional view of the rear end of safe casing of the present utility model;

Fig. 4 is a combination sketch map of the present utility model, and safe casing and pinhead sleeve break with bag member in illustrating;

Fig. 5 illustrates the state of this utility model at preparatory injection;

Fig. 6 illustrates the state that this utility model finishes in injection, pulls out injection needle by pinhead sleeve;

Fig. 7 illustrates the mode that another kind of the present utility model is pulled out injection needle.

As shown in drawings, this utility model safety injector mainly comprises members such as a cartridge 1, a plunger 2, an injection needle 3, a pinhead sleeve 4 and a safe casing 5, wherein:

Cartridge 1 is provided with an annular groove 11 on the outer wall of the bottom of cylindrical shell 10, in that to be provided with what illustrate on twice or the multiple tracks bulge loop 12(figure on the outer wall near barrel front end be twice); Be formed with an awl column base 13 at cartridge 1 front end, the diameter of this awl column base 13 makes awl column base 13 form a step 131 in the bottom greater than the diameter of the cylindrical shell 10 of cartridge; Be provided with one in the bottom of cylindrical shell 10 and refer to button portion 14, but this belongs to conventional structure, thereby do not repeat them here;

Plunger 2 is identical with conventional structure, is used to stretch into cartridge 1 interior medicinal liquid is pushed and enters injection needle 3, and then be expelled in the patient body;

Injection needle 3 is identical with conventional needles, and as shown in Figure 4, its end has a pinhead sleeve joint 31 that engages with the syringe needle junction surface 15 of cartridge front end, and syringe needle junction surface 15 engages with pinhead sleeve joint 31, can be frictional engagement or threads engage in the usual way.

Pinhead sleeve 4 also is conventional member, is an elongate sleeve, injection needle 3 can be entangled fully and engages to be positioned on the pinhead sleeve joint 31, and injection needle 3 can be collected in this pinhead sleeve 4 fully;

Safe casing 5 is sleeved on cartridge 1 outside, and the external diameter of the awl column base 13 of its barrel diameter and cartridge is corresponding, forms the corresponding taper reducing 51 of taper portion of the awl column base 13 of a wimble fraction in it and cartridge 1 front end at its front end, shown in Fig. 2,3; Its stack shell inwall is provided with a plurality of to projecting inward protruding granular body 52 on root edge, these protruding granular bodies 52 engage with the annular groove 11 of cartridge 1 and form suitable card fastening position, this inwall is provided with twice or multiple tracks and cartridge 1 set bulge loop 12 corresponding joint and forms card and end localized inner groove 53 on the appropriate location of contiguous protruding granular body 52, the fit of this safe casing 5 and cartridge 1 so be that the above-mentioned protruding granular body 52 of mat and inner groove 53 are respectively with annular groove 11 and encircle bulge loop 12 and form on different relative positions and block the fastening position;

The above-mentioned member of mat is formed, this safe casing 5 is passed outside not using forward direction, makes inner groove 53 cards in the safe casing 5 end on the bulge loop 12 of cartridge 1 outer wall, makes injection needle 3 fully hidden in safety casing 5, as shown in Figure 4, the while can be enclosed within pinhead sleeve 4 on the injection needle 3 and be protected; When using, then safety casing 5 inwardly can be pushed fully and with cartridge 1 complete fit, and mat protruding granular body 52 only engages card with the annular groove 11 of cartridge 1, this injection needle 3 promptly exposes after removing pinhead sleeve 4 fully at this moment, as shown in Figure 5; Again safe casing 5 is outwards passed to keep injection needle 3 not expose behind to be injected the finishing; Desire further to take off injection needle 3, then pinhead sleeve 4 can be socketed on the pinhead sleeve joint 31 of injection needle 3, directly take out, as shown in Figure 6, or after socket, inwardly retire safe casing 5 again, then pinhead sleeve 4 is pulled out in the lump together with injection needle 3, row abandons again, as shown in Figure 7.

According to above-mentioned use operation, safe casing 5 of the present utility model before not using or injection must pass to engaging card with the bulge loop 12 of cartridge 1 only after finishing, can guarantee that so these injection needle 3 complete mat safety casings 5 surround and do not contact with the external world, be can obtain quite safe practical effect.In addition, described safe casing 5 can be provided with several adjacent anti-skidding convex tendon 54 on the outer wall appropriate location, makes the injection personnel be convenient to these convex tendon 54 usefulness banjo splints of mat and holds and be engaged in and pass action.

Can freely pass the unlikely cartridge 1 of deviating from for guaranteeing safe casing 5, further can in safety casing 5, between two inner grooves 53, be formed with an internal projecting ring 531, the internal diameter of this internal ring 531 just external diameter with the cylindrical shell 10 of cartridge 1 is identical, therefore when safe casing 5 when being extrapolated to the end, this internal projecting ring 531 promptly engages with the step 131 of cartridge 1 front end awl column base 13 bottoms and forms backstop, thereby prevents safe casing 5 to come off from cartridge 1.

By above architectural feature, just can guarantee that the injection needle of syringe does not expose before standby and after the injection, and measure is simple, easy-to-use, thereby possess progressive and practicality.

Claims

1, a kind of safety injector, comprise a cartridge, a plunger, an injection needle and a pinhead sleeve, plunger is used to stretch in the cartridge and enters injection needle with in the cartridge medicinal liquid being pushed, and injection needle is installed in the cartridge front end and is covered by pinhead sleeve, it is characterized in that:

Cartridge (1) is provided with an annular groove (11) on the bottom outer wall of cylindrical shell (10), on outer wall, be provided with twice bulge loop (12) near barrel front end, be formed with its diameter awl column base (13) bigger at the cartridge front end, make this awl column base form a step (131) in the bottom than the diameter of cylindrical shell;

Be arranged with a safe casing (5) in cartridge (1) outside, the external diameter of the awl column base (13) of its barrel diameter and cartridge is corresponding, its stack shell inwall be provided with on the root edge a plurality of to projecting inward, engage with annular groove (11) on the cartridge and to form card and end localized protruding granular body (52), its stack shell inwall is provided with twice and blocks with the corresponding joint formation of twice bulge loop (12) of cartridge and end localized inner groove (53) on the appropriate location of contiguous protruding granular body (52);

Engage with bulge loop (12) on the cartridge (1) by the inner groove (53) on the safety casing (5) and to form card fastening position, guarantee that safe casing is being collected in injection needle (3) fully in the safe casing and will not exposing after outwards passing.

2, by the described safety injector of claim 1, it is characterized in that the inner groove (53) of safe casing (5) and the bulge loop of cartridge (1) can correspondence be arranged to more than two.

3, by the described safety injector of claim 1, it is characterized in that safe casing (5) is provided with the anti-skidding convex tendon (54) of the adjacent setting of multiple tracks at the outer wall suitable position.

4, by the described safety injector of claim 1, it is characterized in that safe casing (5) is being formed with a last internal projecting ring (531) to prevent safe casing to come off from cartridge of bottom stage (131) that is stuck in cartridge (1) front end awl column base (13) when the safety casing is outwards passed to the end between two inner grooves (53).

5,, it is characterized in that safe casing (5) is formed with the corresponding taper reducing of taper portion (51) of the awl column base (13) of a wimble fraction in it and cartridge (1) front end at its front end by the described safety injector of claim 1.