CN2608026Y

CN2608026Y - Safety syringe

Info

Publication number: CN2608026Y
Application number: CN 03220522
Authority: CN
Inventors: 陆永会
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-03-18
Filing date: 2003-03-18
Publication date: 2004-03-31
Anticipated expiration: 2013-03-18

Abstract

The utility model discloses a safe syringe belonging to medical device, the safe syringe includes an external canister, a push rod, a needle-tip, a returning prevention installment and a rubber plug bracket. The push rod is connected with the rubber plug bracket. An internal canister is arranged inside the external canister. The internal canister and the external canister are in surplus matching, the needle-tip is inset inside the lower end of the internal canister and extends into the external canister. The length of the external canister is larger than the length of the needle-tip exposing out of the external canister. The push rod and the returning prevention installment are arranged inside the internal canister. When the syringe accomplishes one liquid drawing and injection operation, the returning prevention installment locks the push rod at the bottom of the internal canister; draw the push rod to drive the internal canister, the needle-tip retracts into the external canister to avoid the polluted pinhead to injure the nurse to improve the safety of the syringe.

Description

Safety injector

Technical field

This utility model relates to a kind of safety injector, belongs to medical instruments field.

Background technology

A kind of disposable syringe is arranged in the prior art, comprise needle point, push rod, urceolus, check device, one easily broken brace rod is arranged on the push rod, described needle point embeds the urceolus lower end, is provided with a push rod check device between syringe and the push rod, comprises a non-return reed, when push rod is pulled out, non-return reed original position in tube is motionless, and when push rod pushed, push rod drove the outside tube bottom operation of non-return reed, when spurring push rod once more, the non-return reed supports and stings on outer tube wall, and push rod is provided with an easily broken brace rod, and the non-return reed supports when stinging on outer tube inner wall, push rod can't spur, under forceful action, the brace rod fracture, syringe damages, can't use by secondary, its weak point is that needle point is exposed to outside the syringe, and the contaminated pinhead after the injection is stabbed the staff easily.

Summary of the invention

The purpose of this utility model provides a kind of safety injector, and the syringe needle that syringe is annotated can be taken in the syringe, has avoided contaminated needle sting staff, thereby improves the safety of syringe.

The purpose of this utility model is achieved in that safety injector, comprise urceolus, push rod, needle point, check device, plug support, described push rod links to each other with the plug support, be provided with an inner core in the described urceolus, inner core and urceolus are interference fit, and needle point embeds the lower end of inner core, and stretches out in urceolus downwards, described urceolus length is exposed to urceolus length partly greater than needle point, and described push rod and check device are arranged in the inner core.

After syringe was finished drawing liquid and action of injection, check device made push-rod lock fix on interior tube bottom, at this moment, the pulling push rod drives the inner core motion, makes in the contaminated needle point withdrawal urceolus, avoid contaminated needle sting staff, thereby improved safety.

As further improvement of the utility model, described outer tube inner wall is provided with a position-limit mechanism, and described position-limit mechanism is exposed to the length of urceolus greater than needle point to the length of inner core upper surface.To prevent that when pulling back push rod, inner core separates with urceolus.

Description of drawings

Fig. 1 is this utility model structural representation of band squama thorn on the guide rod.

Fig. 2 is this utility model structural representation that pushes away band squama thorn on the pole.

Fig. 3 is this utility model structural representation that pushes away no squama thorn on the pole.

Wherein, 1 urceolus, 2 push rods, 3 needle points, 4 plug supports, 5 inner cores, 6,6 ', 6 " non-return reed, 7 brace rods, 8,8 ' squama thorn, 9 guide rods, 10 spacing back-up rings.

The specific embodiment

Embodiment 1:

As Fig. 1, syringe is made of urceolus 1, push rod 2, needle point 3, check device, plug support 4 etc., is provided with an inner core 5 in the urceolus 1, inner core 5 is an interference fit with urceolus 1, needle point 3 embeds the lower end of inner core 5, and stretches out in urceolus 1 downwards, and push rod 2 is arranged in the inner core 5 with check device; Urceolus 1 inwall is provided with a spacing back-up ring 10, and spacing back-up ring 10 is exposed to the length of urceolus 1 greater than needle point 3 to the length of inner core 5 upper surfaces; Being provided with easily broken brace rod 7 between push rod 2 and the plug support 4 links to each other it, check device comprises non-return reed 6 and guide rod 9, and guide rod 9 is provided with squama thorn 8, and squama thorn 8 tilts from top to bottom, guide rod 9 links to each other with plug support 4, and guide rod 9 is arranged at and plug support 4 tops with push rod 2; Non-return reed 6 is socketed on the guide rod, and its inner rim is provided with some inside, upwardly extending fins, and the end of fin is most advanced and sophisticated, and fin is close on the squama thorn 8, and outer rim is provided with some outside, upwardly extending spines and supports and sting on inner core 5 internal faces.

When push rod 2 was pulled out, squama thorn 8 forward backed down non-return reed 6, and push rod 2 moves upward, and finished the drawing liquid action, and simultaneously, non-return reed 6 outer peripheral spines support and sting on inner core 5 internal faces, make non-return reed 6 keep original position motionless in tube; When push rod 2 pushed, squama stung 8 reverse drive non-return reeds 6 to inner core 5 bottoms operations, finishes action of injection, and when spurring push rod 2 once more, non-return reed 6 supports and stings on inner core 5 walls, and reed blocks plug support 4, and push rod 2 and inner core 5 can't relative motioies; Continue pulling push rod 2, relative motion takes place with urceolus 1 in inner core 5, in the needle point 3 withdrawal urceolus 1, props up spacing back-up ring 10 until inner core 5 upper surfaces, under the brute force pulling, and brace rod 7 fractures, push rod 2 is separated with plug support 4, and syringe damages.

Embodiment 2:

As Fig. 2, safety injector is made up of urceolus 1, push rod 2, needle point 3, check device, plug support 4 etc., described push rod 2 links to each other with plug support 4, be provided with an inner core 5 in the described urceolus 1, inner core 5 is an interference fit with urceolus 1, needle point 3 embeds the lower end of inner core 5, and stretches out in urceolus 1 downwards, and push rod 2 is arranged in the inner core 5 with check device; Described urceolus 1 inwall is provided with a spacing back-up ring 10, and spacing back-up ring 10 is exposed to the length of urceolus 1 greater than needle point 3 to the length of inner core 5 upper surfaces; Check device comprise non-return reed 6 ' and squama thorn 8 ', squama thorn 8 ' be arranged on the push rod 2, squama thorn 8 ' from top to bottom tilts, non-return reed 6 ' inner edge is provided with some inside, upwardly extending fins, the end of fin is a flush end, fin be close to squama thorn 8 ' on, outer rim is provided with some outside, upwardly extending spines and supports and sting on inner core 5 internal faces.

When push rod 2 is pulled out, squama thorn 8 ' forward back down non-return reed 6 ', push rod 2 moves upward, and finishes the drawing liquid action, non-return reed 6 ' outer peripheral spine supports and stings on inner core 5 walls, makes reed keep original position motionless in tube; When push rod 2 pushes, squama thorn 8 ' reverse drive non-return reed 6 ', finish action of injection to the operation of inner core 5 bottoms, when spurring push rod 2 once more, non-return reed 6 ' support and sting on inner core 5 walls, reed blocks plug support 4, and push rod 2 and inner core 5 can't relative motioies; Continue pulling push rod 2, relative motion takes place with urceolus 1 in inner core 5, in the needle point 3 withdrawal urceolus 1, props up spacing back-up ring 10 until inner core 5 upper surfaces.

Embodiment 3:

As Fig. 3, syringe comprises urceolus 1, push rod 2, needle point 3, non-return reed 6 ", plug support 4; be provided with an inner core 5 in the urceolus 1, inner core 5 is an interference fit with urceolus 1, needle point 3 embeds the lower end of inner core 5; and stretch out in urceolus 1 downwards, push rod 2 is arranged in the inner core 5 with check device; Urceolus 1 inwall upper edge is provided with a spacing back-up ring 10, spacing back-up ring 10 is exposed to the length of urceolus 1 greater than needle point 3 to the length of inner core 5 upper surfaces, non-return reed 6 " is socketed on the push rod; its inner rim is provided with some inside, upwardly extending spines; spine supports and stings on push rod 2 walls non-return reed 6, and " outer rim is provided with some outside, upwardly extending spines and supports and sting on inner core 5 internal faces.

When push rod 2 was pulled out, push rod 2 overcame non-return reed 6, and " inner edge tension force moves upward, and finishes the drawing liquid action, and " outer peripheral spine supports and stings on inner core 5 walls non-return reed 6, makes reed keep original position motionless in tube; When push rod 2 pushes, non-return reed 6 " the inner edge spine supports and to sting on push rod 2 walls; and drive non-return reed 6 and " move to inner core 5 bottoms, finish action of injection, when spurring push rod 2 once more, non-return reed 6 " support and to sting on inner core 5 inwalls, reed blocks plug support 4, and push rod 2 and inner core 5 can't relative motioies; Continue pulling push rod 2, relative motion takes place with urceolus 1 in inner core 5, in the needle point 3 withdrawal urceolus 1, props up spacing back-up ring 10 until inner core 5 upper surfaces.

This utility model is not limited in the foregoing description, and in the scheme that has the squama thorn, but the end flush end of non-return reed inner edge fin also can be most advanced and sophisticated; Spacing back-up ring also can be designed to snap ring, or to the point of tube internal projection.

Claims

1, a kind of safety injector, comprise urceolus, push rod, needle point, check device, plug support, described push rod links to each other with the plug support, it is characterized in that: be provided with an inner core in the described urceolus, inner core and urceolus are interference fit, and needle point embeds the lower end of inner core, and stretches out in urceolus downwards, described urceolus length is exposed to urceolus length partly greater than needle point, and described push rod and check device are arranged in the inner core.

2, safety injector according to claim 1 is characterized in that: described outer tube inner wall is provided with a position-limit mechanism, and described position-limit mechanism is exposed to the length of urceolus greater than needle point to the length of inner core upper surface.

3, safety injector according to claim 1 and 2, it is characterized in that: described push rod is linked to each other by easily broken brace rod with the plug support, described check device comprises non-return reed and guide rod, guide rod is provided with the squama thorn, the squama thorn tilts from top to bottom, guide rod links to each other with the plug support, and guide rod and push rod are positioned at plug support top and are arranged on the same axis; The non-return reed is socketed on the guide rod, and its inner rim is provided with some inside, upwardly extending fins, and fin is close on the squama thorn, and outer rim is provided with some outside, upwardly extending spines and supports and sting on the inner core wall.

4, safety injector according to claim 3 is characterized in that: the end of described fin is a flush end.

5, safety injector according to claim 3 is characterized in that: the end of described fin is for most advanced and sophisticated.

6, safety injector as claimed in claim 1 or 2, it is characterized by: described check device comprises non-return reed and squama thorn, the squama thorn is arranged on the push rod, the squama thorn tilts from top to bottom, the non-return reed is socketed on the push rod, its inner rim is provided with some inside, upwardly extending fins, and fin is close on the squama thorn, and outer rim is provided with some outside, upwardly extending spines and supports and sting on the inner core wall.

7, safety injector according to claim 6 is characterized in that: the end of described fin is a flush end.

8, safety injector according to claim 6 is characterized in that: the end of described fin is for most advanced and sophisticated.

9, safety injector according to claim 1 and 2, it is characterized in that: described check device is the non-return reed, the non-return reed is socketed on the push rod, its inner rim is provided with some inside, upwardly extending spines, spine supports and stings on the push rod wall, and non-return reed outer rim is provided with some outside, upwardly extending spines and supports and sting on the inner core wall.