CN101690833A - Safety injector with automatically retractable needle - Google Patents

Abstract

The invention provides a safety injector with an automatically retractable needle, which relates to the technical field of medical instruments. The safety injector with the automatically retractable needle comprises the needle, a needle cylinder and a push rod, wherein the needle comprises a needle hub and a needle tube; the needle hub is a hollow core tube; the needle tube is fixedly inserted in the needle hub; the push rod is inserted into a cavity of the needle cylinder, wherein the safety injector with the automatically retractable needle further comprises a needle positioning and sealing device and a needle retracting device, so that the needle can automatically retract to be hidden as soon as injection is finished. The safety injector with the automatically retractable needle has reasonable structural, technical design and convenient assembly, is suitable for automatic assembly on a production line, improves the automation degree and efficiency of the production, high automatic assembly quality and high qualification rate, continues a traditional habitual method in use and is convenient in operation and reliable in effect; moreover, the needle retracts automatically to be hidden after the injection, so that the safety injector with the automatically retractable needle prevents doctors and patients from being hurt by sharp instruments with polluted needle points, contributes to the realization of true single use of the injector, avoids infections of blood-borne diseases and creates a safer and more sanitary medical environment.

Description

A kind of safety injector with automatically retractable needle

Technical field

The present invention relates to technical field of medical instruments, relate in particular to a kind of safety injector of automatically retractable needle.

Background technology

Use disposable sterilized injector at liquid medicine injection with when undergoing preventive vaccination, for the iatrogenic infectious disease of control, prevent that cross infection etc. from having played positive role.But existing various disposable syringes---disposable syringe that comprises push rod self-locking, form such as type self-destroyed---because design and structure is perfect not to the utmost, lack some essential functions, have many weak points.As: some syringes use the back syringe needle exposed outside, very easily cause the injury from sharp utensil people, and exist the hidden danger of direct cross infection, simultaneously, syringe after the use is still intact, this provides the facility of taking advantage of the occasion to reclaim for some lawless persons, promptly should depleted syringe after using in addition reuse again after handling again, in fact now the most of disposable syringes that use are policy " disposable uses ", but the reality repeated multiple times is used, so be difficult to realization disposable use truly; Also have some syringe construction complicated, packaging technology is put upside down or is had some setbacks, and the product percent of pass of assembling is not high, is unfavorable for that more streamline assembles production automatically, compares with ordinary syringe, also has bigger difference on use habit.

Summary of the invention

The objective of the invention is to, at the deficiency of above-mentioned disposable syringe, propose a kind of novel, project organization rationally, packaging technology meet conventionally require, security performance is reliable, when a shot is finished, automatically retractable needle, reach realization disposable safety injector truly.

The objective of the invention is to adopt following technical solution to realize:

A kind of safety injector of automatically retractable needle, comprise syringe needle, syringe and push rod, described syringe needle comprises needle stand and needle tubing, described needle stand is the logical core pipe of hollow, and fixedly intercalation is on needle stand for described needle tubing, and described syringe upper end is the osculum end, the lower end is a big opening end, described push rod inserts the syringe inner chamber from big opening end, it is characterized in that, also comprises syringe needle location sealing device and needle retraction device;

Described syringe needle location sealing device comprises intervalve, stage clip medicated cap and needle stand apical ring, described intervalve is the logical core pipe of hollow, its inner chamber is provided with two inwardly protruded circular boops, the outside is provided with intervalve grab and catching groove, described stage clip medicated cap also is the logical cored structure of hollow, and be provided with stage clip medicated cap grab and spacing collar, described needle stand apical ring is the hollow circular ring shape, its inner chamber is provided with fore-set, described needle stand apical ring is from the insertion of intervalve one end and by a circular boop clamping, the needle stand of described syringe needle is inserted in the inner chamber of intervalve, the butt end bottom surface lower convex platform of needle stand is replaced mutually with the fore-set of needle stand apical ring, needle stand butt end periphery then with the intervalve inner chamber in another circular boop connect airtight, described intervalve is inserted in the inner chamber of syringe osculum end, syringe is exposed on top, intervalve is interlocked fixing by the buckle in catching groove and the syringe osculum end inner chamber, the tube wall of described stage clip medicated cap inserts the intervalve inner chamber, and be coated at needle stand, the stage clip medicated cap is stretched out by the medicated cap hole in the top of needle stand, stage clip medicated cap grab then places the intervalve outside, the stage clip medicated cap connects and fixes by stage clip medicated cap grab and intervalve grab, and the spacing collar of stage clip medicated cap is pressed against the convex platform of needle stand;

Described needle retraction device comprises spring, top plug, and in push rod, be provided with recycling cavity, described spring overcoat is on needle stand, and pressed also by the spacing collar of stage clip medicated cap and the middle boss of needle stand, the upper end open place of described top fork clip plug recycling cavity in push rod, the opening part of jam top, described push rod upper end plug is round barrel shape.

The safety injector of above-mentioned automatically retractable needle, it is characterized in that comprise that also push rod prevents unloading device, described anti-unloading device comprises locking card basket and retaining dish, described locking card basket fixedly is connected in the inner chamber of hollow syringe lower end, and described retaining dish is located at the outside, push rod lower end.

The safety injector of above-mentioned automatically retractable needle, it is characterized in that, also comprise safety, described safety mean when using this Syringing solvent can prevent maloperation, because of can making syringe, maloperation loses function of use in advance, the guard of described safety is fixedly connected on the push rod lower end, and it comprises the hook groove that fixedly is connected as a single entity, gib head and by finger.

The safety injector of above-mentioned automatically retractable needle is characterized in that, also comprises passage, and described passage is located on the push rod.

The safety injector of above-mentioned automatically retractable needle is characterized in that, the medicated cap hole of described stage clip medicated cap is provided with the antifriction tooth.

The safety injector of above-mentioned automatically retractable needle is characterized in that, described syringe, push rod, needle stand, intervalve, stage clip medicated cap, top plug and guard adopt plastic material.

The safety injector of above-mentioned automatically retractable needle is characterized in that, described syringe adopts transparent plastic material.

When the present invention will soon have injected, the top plug contact needle stand afterbody at push rod front opening place, along with push rod continues to advance, the top plug breaks away from the wedging position at push rod front opening place and moves in the push rod recycling cavity, the round barrel shape that exposes contacts the needle stand apical ring along with the push rod propelling fore-set is faded at push rod front opening place, the fore-set of needle stand apical ring supports along with push rod advances and opens, fore-set is undone the effect of replacing of needle stand, needle stand is under the compressive tension effect of spring, and needle stand and needle tubing are being followed the top plug and advanced in the recycling cavity of push rod; Push rod advances in the syringe, and when injecting liquid drug finished, the retaining dish that the push rod lower end is provided with was crossed the locking card basket that fixedly is connected in the inner chamber of hollow syringe lower end and lived by its pintle hook lock, and push rod can not be pulled back again, promptly realizes this syringe self-destruction after the shot; Against existing technologies, structure of the present invention, technological design is reasonable, easy to assembly, and very being suitable for production line assembles automatically, the automaticity and the efficient of producing have been improved, reduced the polluter of assembler and dust proof workshop in a large number, improved the class of dust proof workshop, automatically the contamination of products of assembling is few, quality is good, the qualification rate height, when using, the present invention do not change traditional traditional approach, operation is convenient, and reliable effect can make syringe needle bounce back automatically and hide after injection is finished, guarantee that hospitalized patients exempts from the unexpected injury of the needle point of getting dirty, help realizing syringe disposable use truly, avoid the propagation of blood borne disease, create health more, the medical environment of safety.

Purpose of the present invention, advantage and characteristics will be further explained by the non-limitative illustration of following drawings and Examples, and these embodiment only provide as an example.

Description of drawings

Fig. 1 is equipped with the safety injector sketch map of the automatically retractable needle of protective sleeve for the present invention;

Fig. 2 is the safety injector cross-sectional schematic of the embodiment of theinvention 1 automatically retractable needle;

Fig. 3 is a needle retractable view after the safety injector injection of automatically retractable needle of the present invention is finished;

Fig. 4 is needle stand among Fig. 2, intervalve, stage clip medicated cap and spring assembly structure enlarged diagram;

But Fig. 5 is a guard safety position sketch map;

Fig. 6 is an intervalve cross-sectional schematic of the present invention;

Fig. 7 is stage clip medicated cap cross-sectional schematic of the present invention and schematic top plan view;

Fig. 8 is needle stand apical ring cross-sectional schematic and schematic top plan view;

Fig. 9 syringe cross-sectional schematic of the present invention;

Figure 10 is a locking card basket cross-sectional schematic of the present invention;

Figure 11 is push rod of the present invention and guard (push rod is pressed hands) and top plug combination cross-sectional schematic;

Figure 12 is a needle stand cross-sectional schematic of the present invention;

Figure 13 pushes up the plug cross-sectional schematic for the present invention;

In the above accompanying drawing: the 1-syringe; The 101-buckle; The 2-push rod; The 201-recycling cavity; 202-retaining dish; The recessed draw-in groove of 203-; 204-passage (not marking among the figure); The 3-needle stand; The 301-convex platform; Boss among the 302-; The 303-lower convex platform; The 4-needle tubing; The 5-intervalve; 501-intervalve grab; The 502-catching groove; 503-circular boop one; 504-circular boop two; 6-needle stand apical ring; The 601-fore-set; 7-stage clip medicated cap; 701-stage clip medicated cap grab; The 702-spacing collar; 703-medicated cap hole; 704-antifriction tooth; 8-pushes up plug; 801-fills in convex clip; 9-guard (push rod is pressed hands); 901-hook groove; The 902-gib head; 903-is by referring to; 10-locking card basket; The 11-piston; The 12-spring; The 13-needle protective cap.

The specific embodiment

Embodiment 1:

A kind of safety injector with automatically retractable needle of the present invention as shown in Figure 1, Figure 2, Figure 3 and Figure 4, comprise syringe needle,syringe 1 andpush rod 2, described syringe needle comprisesneedle stand 3 andneedle tubing 4, describedneedle stand 3 is the logical core pipe of hollow, the needle stand 3 of syringe needle adopts prior art to be connected withneedle tubing 4,needle tubing 4 fixedly intercalation onneedle stand 3, pushrod 2inserts syringe 1 inner chamber one end periphery and is fixed withpiston 11,push rod 2 inserts its inner chamber fromsyringe 1 big opening end (lower end), can seal bypiston 11, it belongs to prior art, and the present invention does not elaborate.One end of the safety injector syringe needle of automatically retractable needle is with needleprotective cap 13.

Safety injector of the present invention also comprises syringe needle location sealing device, described syringe needle location sealing device comprisesintervalve 5, stage clip medicatedcap 7 and needle standapical ring 6, describedintervalve 5 is the logical core pipe of hollow, and its inner chamber is provided withcircular boop 1 andcircular boop 2 504, and the outside is provided withintervalve grab 501 and catching groove 502.Described stage clip medicatedcap 7 main bodys also are the logical core pipe of hollow, and its outside is provided with stage clip medicatedcap grab 701 and spacing collar 702.Described needle standapical ring 6 is inserted in the inner chamber ofintervalve 5 end and is fixed by thecircular boop 2 504 ofintervalve 5, theneedle stand 3 of described syringe needle is inserted in the inner chamber ofintervalve 5, thelower convex platform 303 ofneedle stand 3 is replaced mutually with the fore-set 601 that fixes on the needle standapical ring 6 ofintervalve 5,circular boop 1 then connects airtight with 3 the thickest sections peripheries of needle stand, seals.Because thecircular boop 1 and theintervalve 5 of the safety injector of automatically retractable needle of the present invention are designed to integrated member, not only sealing effectiveness is fine, and to making and assembling also very convenient.Describedintervalve 5 covers are inserted in the inner chamber ofsyringe 1 osculum end (upper end), andsyringe 1 is exposed ontop.Intervalve 5 and fixedly clamping ofsyringe 1, promptly intervalve 5 fixes fastening by thebuckle 101 in its catchinggroove 502 andsyringe 1 inner chamber.The tube wall of described stage clip medicatedcap 7inserts intervalve 5 inner chambers, and be coated atneedle stand 3, stage clip medicatedcap 7 is stretched out by medicatedcap hole 703 in the top of needle stand 3,701 of stage clip medicated capgrabs place intervalve 5 outsides, stage clip medicatedcap 7 is by stage clip medicatedcap grab 701 and 501 clampings of intervalve grab, stage clip medicatedcap 7 andintervalve 5 are connected and fixed, and thespacing collar 702 of stage clip medicatedcap 7 compress theconvex platform 301 ofneedle stand 3; Syringe needle is subjected to convexplatform 301 effects such as grade that compressneedle stand 3 withspacing collar 702 of replacing oflower convex platform 303 with the fore-set 601 of its needle stand 3 lower ends, location oninjector syringe 1.

The safety injector of automatically retractable needle of the present invention also comprises needle retraction device, and described needle retraction device comprisesspring 12, needle standapical ring 6 andtop plug 8, and is provided withrecycling cavity 201 inpush rod 2; Describedspring 12 outer being enclosed within on theneedle stand 3, and pressed also by thespacing collar 702 of stage clip medicatedcap 7 and themiddle boss 302 ofneedle stand 3; Described needle standapical ring 6 fixes onintervalve 5, is connected as a single entity with fore-set 601, and describedtop plug 8 is by in the recessed draw-in groove 204 of filling inconvex clip 801jams recycling cavity 201 upper end open positions inpush rod 2, and jam is lived its opening; When injecting liquid drug is about to finish, thetop plug 8 atjam recycling cavity 201 upper end open positions inpush rod 2 touches the afterbody ofneedle stand 3, promotion along withpush rod 2,top plug 8 is to recyclingcavity 201 inner the moving ofpush rod 2, the round barrel shape that exposes contacts needle standapical ring 6 along withpush rod 2 propellings fore-set 601 is faded atpush rod 2 front opening places, the fore-set 601 of needle standapical ring 6 continues to advance along withpush rod 2 and supports and open, the effect of replacing of 601 pairs of needle stands 3 of fore-set is undone, injecting liquid drug finishes, syringe needle is under the effect of themiddle boss 302 ofspring 12 compressive tension bulldozingneedle bases 3, also withspring 12,top plug 8 together falls intorecycling cavity 201, and realization syringe needle retraction is automatically hidden.

In the present embodiment,syringe 1,push rod 2,needle stand 3,intervalve 5, stage clip medicatedcap 6,top plug 8 andguard 9 adopt plastic material to make, and whereinsyringe 1 is a transparent plastic material.Because the installation between above-mentioned each plastic member of safety injector of automatically retractable needle connects the suit clamping form that all adopts, therefore assemble very conveniently, and very being suitable for streamline assembles production automatically.

Embodiment 2:

Present embodiment is similar substantially toembodiment 1, difference is, the safety injector of automatically retractable needle of the present invention comprises that also push rod prevents unloading device, described anti-unloading device compriseslocking card basket 10 and retainingdish 202, describedlocking card basket 10 fixedly is connected in the inner chamber ofsyringe 1 big opening end, and described retainingdish 202 is located at the end outside, pushrod 2 back (descending).As shown in Figure 3, when pushingpush rod 2 liquid medicine injections finished, retainingdish 202 was unblanked only to blockbasket 10 by internal stay, enterlocking card basket 10 before (on) portion, make push rod 2 (not descend) backward to draw back.

Embodiment 3

Present embodiment is similar substantially toembodiment 1, difference is, the safety injector of automatically retractable needle of the present invention also comprises safety, and theguard 9 of described safety is fixedly connected onpush rod 2 lower ends, and it comprises thehook groove 901 that fixedly is connected as a single entity,gib head 902 and by referring to 903.Gibhead 902 can be thrown off (seeing shown in Figure 1) and hook together (seeing shown in Figure 2) with hook groove 901.Guard 9 double aspush rods 2 press hands.When butgib head 902 andhook groove 901 are under the safety position of disengagement, by when the hand propelledpush rod 2, by referring to that 903 are subjected to replacing of (descend) portion (or locking card basket 10) mouth edge at the bottom ofsyringe 1 big opening end, makepush rod 2 can not continue to advance, so needle retraction device is started, reaches the purpose that does not allow syringe needle bounce back automatically.As push plastic material by referring to 903 when doing elastic bending, makegib head 902 andhook groove 901 be in the state of hooking together, safety do not play safety effect.

Embodiment 4

Present embodiment is similar substantially toembodiment 1, as shown in the figure, difference is, the safety injector of automatically retractable needle of the present invention also comprises passage 203, described passage 203 be located on thepush rod 2 or theguard 9 of fixedlying connected with it on, make in thepush rod 2recycling cavity 201 can with the chamber outside be communicated with and be not air-tight state.

In addition, the medicatedcap hole 703 of the described stage clip medicatedcap 7 of the safety injector of automatically retractable needle of the present invention is provided withantifriction tooth 704, when it can reduceneedle stand 3 retraction and the frictional force of stage clip medicatedcap 7.

The foregoing description is as an illustration example only, is not the qualification that the present invention is done, and the present invention can also adopt other modes, step to implement, and does not do superfluous one by one stating at this.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all belong to the protection domain of requirement of the present invention.

Claims (8)

1. safety injector with automatically retractable needle, comprise syringe needle, syringe (1) and push rod (2), described syringe needle comprises needle stand (3) and needle tubing (4), fixedly intercalation is on needle stand (3) for the logical core pipe of hollow, described needle tubing (4) for described needle stand (3), and described syringe (1) upper end is the osculum end, the lower end is a big opening end, described push rod (2) inserts syringe (1) inner chamber from big opening end, it is characterized in that, also comprises syringe needle location sealing device and needle retraction device;

Described syringe needle location sealing device comprises intervalve (5), needle stand apical ring (6) and stage clip medicated cap (7), described intervalve (5) is the logical core pipe of hollow, its inner chamber is provided with circular boop one (503) and circular boop two (504), the outside is provided with intervalve grab (501) and catching groove (502), described stage clip medicated cap (7) also is the logical cored structure of hollow, and be provided with stage clip medicated cap grab (701) and spacing collar (702), the end that described needle stand apical ring (6) is inserted in the inner chamber of intervalve (5) is fixed by circular boop two (504), the needle stand of described syringe needle (3) is inserted in the inner chamber of intervalve (5), the fore-set (601) of the needle stand apical ring (6) of intervalve (5) is replaced mutually with the lower convex platform (303) of needle stand (3) bottom, circular boop one (503) then connects airtight with the thickest section periphery of needle stand (3), described intervalve (5) is inserted in the inner chamber of hollow syringe (1) osculum end, syringe (1) is exposed on top, intervalve (5) is interlocked fixing by the buckle (101) in catching groove (502) and syringe (1) inner chamber, the tube wall of described stage clip medicated cap (7) inserts intervalve (5) inner chamber, and be coated at needle stand (3), stage clip medicated cap (7) is stretched out by medicated cap hole (703) in the top of needle stand (3), stage clip medicated cap grab (701) then places intervalve (5) outside, stage clip medicated cap (7) connects and fixes by stage clip medicated cap grab (701) and intervalve grab (501), and the spacing collar (702) of stage clip medicated cap (7) compresses the convex platform (301) of needle stand (3);

Described needle retraction device comprises spring (12), fore-set (601) and top plug (8), and in push rod (2), be provided with recycling cavity (201), described spring (12) is outer to be enclosed within on the needle stand (3), and pressed also by the spacing collar (702) of stage clip medicated cap (7) and the middle boss (302) of needle stand (3), described fore-set (601) is connected as a single entity with the needle stand apical ring (6) that fixes at intervalve (5) inner chamber, the upper end open place of described top plug (8) jam recycling cavity (201) in push rod (2).

2. the safety injector of automatically retractable needle according to claim 1, it is characterized in that, comprise that also push rod prevents unloading device, described anti-unloading device comprises locking card basket (10) and retaining dish (202), described locking card basket (10) fixedly is connected in the inner chamber of syringe (1) lower end, and described retaining dish (202) is located at the outside, push rod (2) lower end.

3. the safety injector of automatically retractable needle according to claim 1, it is characterized in that, also comprise safety, the guard of described safety (9) is fixedly connected on push rod (2) lower end, and it comprises hook groove (901), the gib head (902) that fixedly is connected as a single entity and presses finger (903).

4. the safety injector of automatically retractable needle according to claim 1 is characterized in that, also comprises passage (203), and described passage (203) is located on the push rod (2).

5. the safety injector of automatically retractable needle according to claim 1 is characterized in that, also comprises passage (203), and described passage (203) is located on the guard (9).

6. the safety injector of automatically retractable needle according to claim 1 is characterized in that, the medicated cap hole (703) of described stage clip medicated cap (7) is provided with antifriction tooth (704).

7. according to the safety injector of claim 1,2,3,4,5 or 6 described automatically retractable needles, it is characterized in that, described syringe (1), push rod (2), needle stand (3), intervalve (5), stage clip medicated cap (7), top plug (8) and guard (9), adopt plastic material, adopt plastic material.

8. the safety injector of automatically retractable needle according to claim 7 is characterized in that, described syringe (1) adopts transparent plastic material.

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