CN2766861Y

CN2766861Y - Air pressure push back type safety syringe

Info

Publication number: CN2766861Y
Application number: CN 200520000716
Authority: CN
Inventors: 杨继雄; 林秀枝
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-01-12
Filing date: 2005-01-12
Publication date: 2006-03-29
Anticipated expiration: 2015-01-12

Abstract

The utility model discloses an air pressure push back type safety syringe, the aim of which is to solve the problems of high manufacturing cost and noise is emitted while in use of the existing safety syringe. The air pressure push back type safety syringe of the utility model comprises an injection cylinder, a needle seat arranged at one end of the syringe, an upper cover and a push rod, wherein a front side ring of the needle seat is provided with screw threads and is combined with a needle head by the outer end, and a plug body is inserted in the back end; the upper cover is screwed and fixed on one end of the injection cylinder and is provided with a screw hole which corresponds to the screw threads of the needle seat and is screwed and fixed simultaneously; the front end of the push rod forms a push rod piston contained in the injection cylinder. When the utility model withdraws the needle seat, the plug body is pushed and bunted by the push rod piston to seal a containing groove, the push rod piston is backwards drawn and the needle seat is pushed into the injection cylinder through air pressure. The utility model has the advantages that not sound is emitted in the process of operation, the production cost is reduced because of the simplex shape and the popularization rate of usage is improved.

Description

Air pressure pushes back the formula safety injector

Technical field

This utility model relates to and a kind ofly is applied to medical field and can promotes syringe safe in utilization, relates in particular to a kind ofly to reclaim entry needle and the low air pressure of simple structure production cost pushes back the formula safety injector with atmospheric pressure.

Background technology

Medical personnel are when using injection tube injection medicament or blood drawing check, often stabbed in the process that covers needle cover by syringe needle, and many diseases for example hepatitis or acquired immune deficiency syndrome (AIDS) all are by blood infection, wound can touch patient's body fluid when medical personnel are wounded by stabbing, thereby under the excessive risk that makes medical personnel be exposed to catch, therefore the design and the release of safety syringe-drum are arranged, to avoid the generation of this problem.

And existing safety syringe-drum exists the problem that some use, M241049 number " haulback safety syringe of one-hand operation " the novel patent case that please refer to certificate number, its syringe needle and plunger in syringe respectively is formed with one first convergence part and second convergence part in opposite position, by the mutual buckle in first convergence part and second convergence part, the pulling plunger retracts syringe needle in the syringe.

Above-mentioned safety injector forms many bendings during fabrication, has complicated shape, the therefore necessary high mould production of service precision, and the high mould of precision is expensive and increase the problem of production cost except price, because the raising of production cost can make the price of safety injector improve, make its price competitiveless, so the high safety injector of the more general syringe of cost is because the factor of price and can't popularizing is very unfortunate.

Except the cost problem, safety injector also has some shortcomings in use, common people more or less nourish fear to injecting the invasive medical procedure of this kind, and when being the patient infusion medicament, when engaging mutually with second convergence part, first convergence part can send the clear and melodious sound, this sound is frightened for the patient that fear is had an injection especially, and the mood influence when seeking medical advice for the patient is not little, reduces the wish that medical institutes adopts this kind safety injector yet.

The utility model content

Owing to having the cost height, existing safety injector is difficult for popularizing, and send shortcomings such as the sound in the use, this utility model provides a kind of air pressure to push back the formula safety injector, mainly realizes the purpose of using safely with simple structure and addresses the above problem.

For achieving the above object, this utility model system comprises:

One injection tube, it is provided with a tubular body, and forms screw thread in an end periphery of tubular body, and interior week, the tubular body was formed with a retaining edge in the outside projection of the other end around forming multiple tracks anti-rotation raised line at interval;

One needle stand, it comprises a syringe needle, an one needle stand body and a cock body, the perisporium of this needle stand body is provided with the straight raised line that is fastened with the anti-rotation raised line and is located at an end in the injection tube, and stretch in front end and to establish one and stretch out this external syringe needle attachment of this tubular, the back segment of syringe needle attachment periphery is provided with screw thread, and in wherein being provided with a sluice way, this needle stand body inwardly is formed with a storage tank in the rear end, this storage tank communicates with sluice way, the needle stand body and more than the storage tank side face is interval with together an end by the long groove shape runner of this needle stand body open rearward end, this syringe needle system is incorporated into the syringe needle attachment outer end of this needle stand body, cock body be height greater than the cylinder of each flow channel length, this cock body pastern divides plug to be located in the storage tank and hides the part of each runner;

One loam cake is covered with screw thread with corresponding with the screw thread of tubular body one end and screw on this, loam cake is formed with a location screw and is rotated with the syringe needle attachment in central authorities screw thread that should the syringe needle attachment, locatees this needle stand by this; And

One push rod, this push rod front end is formed with a push-rod piston, and push rod system is placed in the tubular body of this injection tube with push-rod piston.

Further, this utility model is made as taper with the front side of its syringe needle attachment of needle stand body and in conjunction with described syringe needle, and the positioning screw hole of described loam cake is slightly larger than described syringe needle and can holds syringe needle and pass through, be provided with the gas-tight ring of a ring projection in a needle stand body side face end ring inwards, this gas-tight ring outer end is against the inwall of described tubular body, by this, make that this needle stand location is better and air-tightness is better.

Further, this utility model is equipped with an auxiliary flow in cock body, and this auxiliary flow one end opening is in storage tank, and the other end is not filled in by the cock body perisporium and is located in the storage tank and a side opening of not corresponding each runner.

In addition, this utility model is for making push rod in using the back bending to be more prone to, and be provided with a bending recess in this push rod near the part of its push-rod piston, and this utility model syringe needle can be integrally formed at the syringe needle attachment.

This utility model uses when extracting medicinal liquid or blood, liquid enters in this tubular body after via syringe needle, sluice way and runner, after finishing using, system pushes this cock body in the storage tank of this needle stand body by this push rod with its push-rod piston, sealing each runner by this causes airtight, after the loam cake of outwarding winding leave the tubular body, turn is simultaneously left and the positioning screw hole localized needle stand that is screwed, then push rod is pulled back, cause vacuum between cock body and the needle stand, utilize atmospheric pressure that needle stand is reclaimed to injection tube, promptly realize the purpose of this utility model safe handling.

This utility model is with the atmospheric pressure seat of narrowing back and forth, therefore the design of each one and shape structure is all simple, needs design with complicated shape with the realization effect unlike existing safety syringe-drum because of wanting mutual buckle, in comparison, the utlity model has following good characteristic:

1. this utility model simple structure, need not use accurate mould ejection formation can realize the purpose of using safely, make easily and can effectively reduce cost, has the competitiveness on the price, even on price, be as good as with general syringe cylinder, make that this utility model can be effectively universal, allow masses be used.

2. this utility model is not to use the mode that interlocks to reclaim needle stand, can not produce the clear and melodious sound in applying to the process of liquid medicine injection, can not cause injected patient's fear.

Description of drawings

Fig. 1 is the three-dimensional exploded view of this utility model first preferred embodiment.

Fig. 2 is the profile of this utility model first preferred embodiment.

Fig. 3 is the sectional drawing of this utility model first preferred embodiment.

Fig. 4 is the action sketch map of the push rod pushing and pressing cock body of this utility model first preferred embodiment.

Fig. 5 is the action sketch map that unscrews this loam cake of this utility model first preferred embodiment.

Fig. 6 is the recovery needle stand of this utility model first preferred embodiment and the action sketch map of the push rod that fractures.

Fig. 7 is the profile of this utility model second preferable enforcement.

Fig. 8 is the sectional drawing of this utility model second preferable enforcement.

The specific embodiment

This utility model is that a kind of air pressure pushes back the formula safety injector, and please referring to first preferred embodiment of Fig. 1～3, it is provided with:

One injection tube 10, injection tube 10 is provided with a tubular body 11 cylindraceous, tubular body 11 is formed with one section screw thread 12 in an end of its periphery, and in the interior week that forms screw thread 12 1 ends around being interval with multiple tracks anti-rotation raised line 13, each anti-rotation raised line 13 the axial direction that direction is parallel tubular body 11 is set, tubular body 11 in the other end that is not provided with screw thread 12 by the side face both sides respectively outwards projection be formed with the retaining edge 14 of a flap-like.

One needle stand 20, it comprises needle stand body 22 and a part of cock body 23A that is placed in this needle stand body 22 of a syringe needle 21, a tubular, wherein:

Needle stand body 22 is cylindrical shape and is arranged in the end that tubular body 11 is provided with screw thread 12; Corresponding each the anti-rotation raised line 13 in these needle stand body 22 side face intervals is equipped with the straight raised line 221 that multiple tracks is fastened; The direction that each straight raised line 221 arranges is the axial direction of parallel tubular body 11; And each anti-rotation raised line 13 makes relatively tubular body 11 rotations of needle stand 20 with corresponding each the straight raised line 221 of blocking in side; The side face of needle stand body 22 is provided with the gas-tight ring 222 of a ring projection in an end ring inwards; The outer end of gas-tight ring 222 is against the inwall of tubular body 11

Needle stand body 22 is established a syringe needle attachment 223 of stretching out outside this tubular body 11 in the central authorities of front end towards protracting, the back segment of syringe needle attachment 223 peripheries is provided with one section screw thread 224, and the front side of syringe needle attachment 223 is taper, syringe needle attachment 223 and in wherein being formed with a sluice way 225 that connects

Needle stand body 22 is formed with a storage tank 226 in the end face mediad of rear end, this storage tank 226 is circle and communicates with sluice way 225 in this preferred embodiment, needle stand body 22 also is formed with the runner 227 of the axial and end opening of together above parallel pin seat body 22 at interval in adjoining storage tank 226 side face places, each runner 227 is a long groove shape, in this preferred embodiment, lie in this needle stand body 22 and be formed with four road runners 227, and the degree of depth that is shorter in length than this storage tank 226 of each runner 227;

Syringe needle 21 is sheathedly to be incorporated into the front end of this syringe needle attachment 223 and to communicate with sluice way 225, and in addition, syringe needle 21 also can form one-body molded with syringe needle attachment 223 front ends;

Cock body 23A is cylindrical and has certain frictional force against storage tank 226 grooves weeks with outer wall, and cock body 23A height is greater than the length of each runner 227, in this preferred embodiment, the height of this cock body 23A equals the degree of depth of storage tank 226, this cock body 23A is located in the storage tank 226 with part driving fit plug earlier, and cock body 23A only hides the part of each runner 227.

One loam cake 30, these loam cake 30 cordings have the circular lid of base plate, and in interior formation inner peripheral surface, the screw thread 12 of loam cake 30 corresponding tubular body 11 1 ends forms screw thread 31 and screws in inner peripheral surface, and corresponding syringe needle attachment 223 has extended to form a sleeve 32 before the base plate mediad, be formed with a location screw 33 in sleeve 32, loam cake 30 is rotated with the screw thread 224 of syringe needle attachment 223 with positioning screw hole 33, locate this needle stand 22 by this, and this positioning screw hole 33 is slightly larger than this syringe needle 21, makes syringe needle 21 can pass through this positioning screw hole 33.

One push rod 40, these push rod 40 tie-rod shapes also forming the ring-type cork and constitute push-rod piston 41 around front end, this push rod 40 is placed in this push-rod piston 41 in the tubular body 11 of this injection tube 10, this push rod 40 and in the part near push-rod piston 41 be formed with one the bending recess 42.

This utility model has other embodiment, please referring to second preferred embodiment of Fig. 7, Fig. 8, it has improved the cock body 23A in first preferred embodiment, be equipped with an auxiliary flow 24B in the cock body 23B of second preferred embodiment, auxiliary flow 24B has three openings, wherein an opening be located at cock body 23B the front and towards in storage tank 226, in addition two openings system is not filled in by cock body 23B perisporium and is located in the described storage tank 226 and the both-side opening of corresponding each runner 227 not, in second preferred embodiment, the opening that auxiliary flow 24B is located at perisporium also can only be provided with one.

Below with first preferred embodiment explanation this utility model embodiment, this utility model uses when extracting medicinal liquid, please referring to Fig. 2, spur this push rod 40 and drive its push-rod piston 41 drawing liquid backward, this moment liquid system by this syringe needle 21 in regular turn via this sluice way 225, runner 227 backs flow in this tubular body 11, oppositely promoting push-rod piston 41 then releases the air in the tubular body 11 outside the tubular body 11, when avoiding injection medicament air is squeezed in the human body, during injection to be used, syringe needle 21 is inserted the patient, promote push rod 40 then, medicament is sent by syringe needle 21 via sluice way 225 by the runner 227 of this needle stand body 22 again.

When this utility model is finished using back desire recovery needle stand 20, please referring to Fig. 1 and Fig. 3～6, promotion push rod 40 makes with push-rod piston 41 promotion cock body 23A and enters in the storage tank 226 of needle stand body 22, make cock body 23A seal each runner 227, make it not communicate with this storage tank 226 and sluice way 225 and realize the sealing, then this loam cake 30 is unclamped in rotation, make its turn leave tubular body 11, simultaneously also turn is left and the positioning screw hole 33 localized needle stand 20 that is screwed, and owing to being fastened of anti-rotation raised line 13 and straight raised line 221, make that needle stand 20 can and then not rotate in the process that loam cake 30 rotations break away from, and can break away from the positioning screw hole 33 of loam cake 30, then push rod 40 is pulled back, cause vacuum between push-rod piston 41 and the needle stand 20, utilize atmospheric pressure that needle stand 20 is reclaimed in injection tube 10, at last push rod 40 is fractureed by bending recess 42 places, promptly realize the purpose of this utility model safe handling.

Claims

1. an air pressure pushes back the formula safety injector, it is characterized in that, this syringe comprises:

One needle stand, it comprises a syringe needle, an one needle stand body and a cock body, the perisporium of this needle stand body is provided with the straight raised line that is fastened with the anti-rotation raised line and is located at an end in the injection tube, and stretch in front end and to establish one and stretch out this external syringe needle attachment of this tubular, the back segment of syringe needle attachment periphery is provided with screw thread, and in wherein being provided with a sluice way, this needle stand body inwardly is formed with a storage tank in the rear end, this storage tank communicates with sluice way, the needle stand body and more than the storage tank side face is interval with together an end by the long groove shape runner of this needle stand body open rearward end, this syringe needle is incorporated into the syringe needle attachment outer end of this needle stand body, cock body be height greater than the cylinder of each flow channel length, this cock body is partly filled in and is located in the storage tank and hides the part of each runner;

One push rod, this push rod front end is formed with a push-rod piston, and push rod is placed in the tubular body of this injection tube with push-rod piston.

2. air pressure as claimed in claim 1 pushes back the formula safety injector, it is characterized in that: the front side of described its syringe needle attachment of needle stand body is taper and in conjunction with described syringe needle, and the positioning screw hole of described loam cake is slightly larger than described syringe needle, a described needle stand body side face end ring inwards is provided with the gas-tight ring of a ring projection, and this gas-tight ring outer end is against the inwall of described tubular body.

3. air pressure as claimed in claim 1 or 2 pushes back the formula safety injector, it is characterized in that: be installed with an auxiliary flow in the described cock body, this auxiliary flow one end opening is towards in storage tank, and the other end is not filled in by the cock body perisporium and is located in the described storage tank and a side opening of corresponding each runner not.

4. air pressure as claimed in claim 3 pushes back the formula safety injector, it is characterized in that: described syringe needle is integrally formed at described syringe needle attachment.

5. air pressure as claimed in claim 4 pushes back the formula safety injector, it is characterized in that: described push rod is formed with a bending recess in the part near its push-rod piston.

6. air pressure as claimed in claim 5 pushes back the formula safety injector, it is characterized in that: described needle stand body is formed with four road runners.

7. air pressure as claimed in claim 1 or 2 pushes back the formula safety injector, it is characterized in that: described syringe needle is integrally formed at described syringe needle attachment.

8. air pressure as claimed in claim 7 pushes back the formula safety injector, it is characterized in that: described push rod is formed with a bending recess in the part near its push-rod piston.

9. air pressure as claimed in claim 1 or 2 pushes back the formula safety injector, it is characterized in that: described push rod is formed with a bending recess in the part near its push-rod piston.

10. air pressure as claimed in claim 1 or 2 pushes back the formula safety injector, it is characterized in that: described needle stand body is formed with four road runners.