CN202569093U

CN202569093U - Inner needle seat structure for replaceable needle for safety self-destruction syringe

Info

Publication number: CN202569093U
Application number: CN 201220071197
Authority: CN
Inventors: 王祖扬
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-02-29
Filing date: 2012-02-29
Publication date: 2012-12-05
Anticipated expiration: 2022-02-28

Abstract

The utility model discloses an inner needle seat structure for a replaceable needle for a safety self-destruction syringe. An inner needle seat body consists of an upper replaceable needle assembly part and a lower elastic seal limiting part which have an integrated monolithic structure; the surface of the elastic seal limiting part is provided with an annular buffer gap; an annular seal limiting clamping part is formed at an outer wall of the elastic seal limiting part; and anti-lateral rotation convex ribs are formed at an outer wall of the elastic seal limiting part below the annular seal limiting clamping part. When a needle seat is pulled back into a syringe cylinder, an injection needle can fall to one side of an inner wall of the cylinder in a direction near a 45-degree angle in a stress environment of asymmetrical action force; and a locking piece is arranged at one end of a mandrel of the syringe. The locking piece is an asymmetrical pull-back locking piece; and after the injection needle completely returns to the cylinder, a needle head can be locked by a neck of the cylinder, and the injection needle and the needle seat cannot be pushed out of the cylinder again, so that the secondary damage caused by pushing the needle head out of the cylinder again is effectively prevented.

Description

A kind of interior needle stand structure of changed pin that is used for safety self-destructing syringe

Technical field

This utility model relates to technical field of medical, a kind of specifically interior needle stand structure of changed pin that is used for safety self-destructing syringe, and it is particularly related to the anti-sidespin structure of its outer wall.

Background technology

Documents one, the patent No.: ZL200710047077.4, the applying date: 2007.10.16; Notification number: CN101411908, the patentee: Shanghai DingJianTang biochemistry Science Co., Ltd, this case discloses " a kind of safe self-destruction type vaccine injector "; Comprise cylindrical shell, be provided with core bar in the cylindrical shell, core bar is provided with plug near the place, end; Be provided with syringe needle in the tube neck of cylindrical shell, the syringe needle place is provided with needle tubing, it is characterized in that: the body of rod sidewall of said core bar end is provided with horizontal cut; Vertical breach at horizontal cut and body of rod place, core bar end links, and horizontal cut matches with vertical breach, and syringe needle is socketed to form by last needle stand and following needle stand; Following needle stand inner chamber hollow, following needle stand becomes tubular structure, and following needle stand is provided with down the needle holder convex tendon with respect to the other end opening part inwall of installing needle holder; The core bar end is provided with the elastomer that is formed with vertical breach UNICOM by horizontal cut, and the core bar body of rod here has certain elasticity, and wherein vertically breach is up-narrow and down-wide shape; And horizontal cut outside opening place upper core club shaft outer wall protrudes from lower core club shaft outer wall here, and horizontal cut can be high outside and low outside shape, and it is circular-arc that the core bar end becomes; Last needle stand becomes bar shape, and last needle stand outer wall epimere is provided with the reinforcement fin, and last needle stand outer wall hypomere is provided with fixedly bulge loop of needle stand; Fixedly the overall diameter of bulge loop is greater than last needle stand outer diameter 0.05mm-0.3mm for last needle stand, and said needle stand down becomes bar shape, its inner chamber hollow; Following needle stand cavity inner wall place is provided with down needle holder annular fixed groove, following needle holder annular fixed groove can with last needle stand fixedly bulge loop match, the internal diameter of the annular fixed groove upper chamber of following needle holder is less than the fixing external wall external diameter of the bulge loop upper bar 0.1mm-0.35mm of last needle stand; Internal diameter≤last the needle stand of following needle holder annular fixed groove lower cavity is the external wall external diameter of bulge loop lower pole fixedly; Following needle stand is provided with down the needle holder annular convex rib with respect to the place, other end outer wall end of following needle holder bulge loop, and the tube neck inwall place of said cylindrical shell is provided with a neck upper limit ring and a tube neck lower limit ring respectively, and the distance between a neck upper limit ring and the tube neck lower limit ring is 0.3mm-1.5mm; Tube neck upper limit ring protrudes from inwall 0.1mm-0.6mm between a neck upper limit ring and the tube neck lower limit ring; Tube neck lower limit ring protrudes from inwall 0.02mm-0.25mm between a neck upper limit ring and the tube neck lower limit ring, the internal diameter of cylinder lumen between the internal diameter>=tube neck upper limit ring of tube neck upper limit ring top cylinder lumen and the tube neck lower limit ring, the internal diameter of the internal diameter≤tube neck lower limit ring bottom cylinder lumen of cylinder lumen between tube neck upper limit ring and the tube neck lower limit ring; The internal diameter of cylinder lumen is less than following needle holder annular convex rib external diameter 0.1mm-0.5mm between tube neck upper limit ring and the tube neck lower limit ring; Cylinder lumen is provided with the spacing muscle of cylindrical shell with respect to the other end inwall place of tube neck, and the spacing muscle of cylindrical shell can be linear annular muscle, many annular muscle, annular muscle that perpendicular muscle, a plurality of raised points constitute that perpendicular muscle constitutes, and the cylinder inboard wall place of the spacing muscle of cylindrical shell bottom is provided with the cylindrical shell inner convex rib; The thickness of the distance between spacing muscle of cylindrical shell and the cylindrical shell inner convex rib>=annular stop sheet, the internal diameter at the spacing muscle of cylindrical shell place is less than the diameter of annular stop sheet.

The function of utilizing barbed body to realize needle retractable is arranged in the existing safety injector structure, realize safety injection.General barbed body is metalwork or working of plastics.Metalwork need be processed and cooperate with core bar or assemble; Complex manufacturing technology; Difficulty is big and stability is not good, has not only increased manufacturing procedure and manufacturing cost, and metalwork itself and assembling process thereof can increase the uncertainties such as hidden danger of product aspect safety and product quality.Structurally still there is defective in existing plastics barb member or incomplete place is arranged, and therefore causes product in use to have potential safety hazard or security breaches.The design of existing plastics back-off spare though can realize the syringe needle function of pulling back, in use, still is in normal trace after syringe needle is pulled back, and syringe needle might be caused user by the risk of secondary damage by release once more.

In addition, all there are a same difficult problem in existing single needle seat pumpback formula safety self-destructing syringe or safety injector, are exactly engage between needle stand and the cylindrical shell in how solving to stablize and reach certain intensity to meet stability requirement; Simultaneously, required pulling force can not use with convenient too greatly when the pumpback needle stand.Though rigid fit structure can reach interior needle stand and the stable locking effect of cylinder inboard wall, be difficult to or even can't reach simultaneously the demand of convenient use.The unstability that plastic material itself exists and the characteristic that is subject to variation of ambient temperature can cause the product stability extreme difference of hard fit structure, and quality and precision all are difficult to control in the production process, almost can't realize batch process.

In sum; Still need further improve the core bar structure of existing haulback type syringe and the latch-up structure between interior needle stand and the cylindrical shell; Further to improve product safety and stability in use, reach the simplification manufacturing procedure simultaneously, reduce the purpose of manufacturing cost.

Summary of the invention

The purpose of this utility model is to provide a kind of interior needle stand structure of changed pin that is used for safety self-destructing syringe, locks each other through the elastic buffer snap fastener between needle stand and the injector cartridge in its syringe.The buffer gap at ingenious utilization engaging position and the plasticity of engaging parts, perfection realizes both lockings and breaks away from effect.This elastic buffer snap fastener can be arranged at interior needle stand place, also can be arranged at the cylinder inboard wall place; No matter adopt which kind of mode, as long as form corresponding and snap fastener that cooperatively interact at interior needle stand or cylinder inboard wall place simultaneously.Should be provided with anti-sidespin convex tendon, needle stand generation sidespin in effectively preventing in interior needle stand outer wall place.The employed core bar of this syringe end is provided with the asymmetric locking piece of band spring function, and this locking piece can lock through engaging mode with the syringe needle inner chamber each other.When needle stand was pulled back to injector cartridge, under the strength effect of asymmetric elastic construction, needle stand can stressed taking advantage of a situation change to a lateral deviation; Therefore entry needle also can swing to cylinder inboard wall one side to nearly 45 angular direction; After entry needle is return cylindrical shell fully; Syringe needle can be locked by the cylindrical shell cervical region; Cause entry needle and needle stand to be released once more outside the cylindrical shell thus; Prevent that effectively syringe needle from being released the secondary damage cause once more, realize the safety self-destruct operation of syringe, overcome the shortcoming and defect that exists in the prior art.

To achieve these goals; The technical scheme of this utility model is: a kind of interior needle stand structure of changed pin that is used for safety self-destructing syringe; It comprises interior needle stand body, and interior needle stand body lower end offers the latch well of pulling back, and it is characterized in that: the needle stand body is made up of the changed pin department of assembly on top and the elastic packing limiting section of bottom in said; Both are integral the formula monomer structure; Elastic packing limiting section surface offers the ring-type buffer gap, and the outer wall place of elastic packing limiting section forms the spacing holding section of annular seal, and the outer wall place of the elastic packing limiting section of below, the spacing holding section of annular seal forms anti-sidespin convex tendon.

Another technical scheme of this utility model is: a kind of interior needle stand structure of changed pin that is used for safety self-destructing syringe; It comprises interior needle stand body; Interior needle stand body lower end offers the latch well of pulling back; It is characterized in that: the needle stand body is made up of the changed pin department of assembly on top and the elastic packing limiting section of bottom in said, and both become split type assembly structure, and elastic packing limiting section surface offers the ring-type buffer gap; Elastic packing limiting section outer wall place forms the spacing holding section of annular seal, and the outer wall place of the elastic packing limiting section of below, the spacing holding section of annular seal forms anti-sidespin convex tendon.

The utility model discloses needle stand structure in a kind of changed pin that is used for safety self-destructing syringe, with its end of supporting syringe core rod be provided with the asymmetric locking piece of pulling back of band spring function; The design of asymmetry respective outer side edges spring function can be guaranteed that this locking piece can insert the needle stand inner chamber smoothly, and utilize the function of its elastic dilatation, and realization asymmetric holding section, both sides engages and locking with the needle stand inner chamber.When needle stand was pulled back to injector cartridge, receiving under the force environment of asymmetric active force, needle stand can stressedly change to a lateral deviation, and therefore entry needle can swing to cylinder inboard wall one side to nearly 45 angular direction; After entry needle was return cylindrical shell fully, syringe needle can be caused entry needle and needle stand to be released once more outside the cylindrical shell by cylindrical shell cervical region locking thus, prevented effectively that syringe needle from being released once more to cause secondary damage, really realized the safety self-destruct operation of syringe.Needle stand outer wall place forms anti-sidespin convex tendon, prevents that effectively needle stand portion from sidespin taking place.When practical implementation of the present invention, the described asymmetric elasticity locking piece of pulling back is an integral type steel coupler body.This steel coupler body adopts the design principle of asymmetry and the ingenious cooperation of elastomer structure, uses specific angle and size design, makes the steel coupler body possess the elastic buffer lock function.The pull back snap lock effect of part and needle stand inner chamber of the asymmetric elasticity of core bar end is splendid, and the product reasonable integral structure is skillfully constructed, and manipulates simply, and stable working state is easy to apply.Compare existing product design and technology, have significant technical breakthrough in the design, and have outstanding safety and practicality characteristics.

Description of drawings

Fig. 1 is this utility model structural representation.

Fig. 2 is this utility model user mode figure.

The specific embodiment

With reference to the accompanying drawings, this utility model is further described.

This utility model is a kind of interior needle stand structure of changed pin that is used for safety self-destructing syringe; It comprises interior needle stand body 1; Interior needle stand body 1 lower end offers the latch well 2 of pulling back; It is different from prior art and is: needle stand body 1 is made up of the changed pin department of assembly 3 on top and the elastic packing limiting section 4 of bottom in said, and both are integral the formula monomer structure, and elastic packing limiting section 4 surfaces offer ring-type buffer gap 5; The outer wall place of elastic packing limiting section 4 forms the spacing holding section 6 of annular seal, and the outer wall place of the elastic packing limiting section 4 of 6 belows, the spacing holding section of annular seal forms anti-sidespin convex tendon 9.

Among another embodiment of this utility model; It comprises interior needle stand body 1; Interior needle stand body 1 lower end offers the latch well 2 of pulling back; It is characterized in that: needle stand body 1 is made up of the changed pin department of assembly 3 on top and the elastic packing limiting section 4 of bottom in said, and both become split type assembly structure, and elastic packing limiting section 4 surfaces offer ring-type buffer gap 5; Elastic packing limiting section 4 outer wall places form the spacing holding section 6 of annular seal, and the outer wall place of the elastic packing limiting section 4 of 6 belows, the spacing holding section of annular seal forms anti-sidespin convex tendon 9.

In the specific implementation, said 3 tops, pin department of assembly of changing are circular cone shape, and its tapering is 6:100, can change pin department of assembly 3 outer walls and be provided with external spiral stricture of vagina 8.

In the specific implementation, the end of said anti-sidespin convex tendon 9 is semicircle arcuation or taper.

In the specific implementation; The said outer wall place, 3 bottom, pin department of assembly that changes forms annular seal ring assembling groove 7; Formation circular step 11 or ring-type are domatic between annular seal ring assembling groove 7 and elastic packing limiting section 4 tops, and annular seal ring assembling groove 7 places are provided with rubber seal 13.

In the specific implementation; The height of said ring-type buffer gap 5 notches to bottom land is 0.05mm-4mm; The width of ring-type buffer gap 5 is 0.05mm-4mm; The distance on 6 surperficial cambered surface arc tops, the spacing holding section of ring-type buffer gap 5 outside cell walls and annular seal is 0.1mm-6mm; Distance between cell wall notch place, 5 outside, ring-type buffer gap and the spacing holding section of annular seal 6 outer walls is 0.1mm-6mm, and the distance between cell wall bottom land place, 5 outside, ring-type buffer gap and the spacing holding section of annular seal 6 outer walls is 0.1mm-6mm.

In the specific implementation, the surface of the spacing holding section 6 of annular seal becomes arc surfaced.

In the specific implementation, 6 surfaces, the spacing holding section of said annular seal become arc surfaceds, and its arc pushes up to the distance of cambered surface top edge and pushes up to the distance of cambered surface lower limb less than arc.

In the specific implementation, the elastic packing limiting section 4 outer wall places of 6 bottoms, the spacing holding section of said annular seal form annular recess 10.

In the specific implementation, the bottom land of said annular recess 10 and ring-type buffer gap 5 is positioned at same horizontal plane or is higher than the bottom land of ring-type buffer gap 5.

In the specific implementation, said annular seal ring assembling groove 7 places are socketed with " O " shape O-ring seal.

In the specific implementation, said elastic packing limiting section 4 upper surfaces or lower surface offer ring-type buffer gap 5.

In the specific implementation, said elastic packing limiting section 4 is arranged at and can changes pin department of assembly 3 at or middle section or place, top, and both are integrally formed formula monomer structure or split type assembly structure.

In the specific implementation, 6 places, the spacing holding section of the annular seal of said elastic packing limiting section 4 outer walls form some breach or cut off line.

In the specific implementation; As shown in fig. 1; Interior needle stand body is assembled to from the rear portion in the front end tube neck of cylindrical shell 12, and tube neck inwall is provided with and prevents the reverse anti-sidespin convex tendon that sidespin convex tendon 9 matches, and can prevent after both cooperate that interior needle stand body from can change needle stand in assembling is that sidespin takes place.

Above content is the further explain that combines concrete preferred implementation that this utility model is done, and can not assert that this utility model practical implementation is confined to above-mentioned these explanations.For the those of ordinary skill of technical field under this utility model, under the prerequisite that does not break away from this utility model design, can also make some simple deduction or replace, all should be regarded as belonging to the protection domain of this utility model.

Claims

1. needle stand structure in the changed pin that is used for safety self-destructing syringe; It comprises interior needle stand body (1); Interior needle stand body (1) lower end offers the latch well of pulling back (2); It is characterized in that: needle stand body (1) is made up of the changed pin department of assembly (3) on top and the elastic packing limiting section (4) of bottom in said, and both are integral the formula monomer structure, and elastic packing limiting section (4) surface offers ring-type buffer gap (5); The outer wall place of elastic packing limiting section (4) forms the spacing holding section of annular seal (6), and the outer wall place of the elastic packing limiting section (4) of below, the spacing holding section of annular seal (6) forms anti-sidespin convex tendon (9).

2. needle stand structure in the changed pin that is used for safety self-destructing syringe; It comprises interior needle stand body (1); Interior needle stand body (1) lower end offers the latch well of pulling back (2); It is characterized in that: needle stand body (1) is made up of the changed pin department of assembly (3) on top and the elastic packing limiting section (4) of bottom in said, and both become split type assembly structure, and elastic packing limiting section (4) surface offers ring-type buffer gap (5); Elastic packing limiting section (4) outer wall place forms the spacing holding section of annular seal (6), and the outer wall place of the elastic packing limiting section (4) of below, the spacing holding section of annular seal (6) forms anti-sidespin convex tendon (9).

3. a kind of interior needle stand structure of changed pin that is used for safety self-destructing syringe according to claim 1; It is characterized in that: the said top, pin department of assembly (3) of changing is circular cone shape; Its tapering is 6:100, can change pin department of assembly (3) outer wall and be provided with external spiral stricture of vagina (8).

4. a kind of interior needle stand structure of changed pin that is used for safety self-destructing syringe according to claim 1, it is characterized in that: the end of said anti-sidespin convex tendon (9) is semicircle arcuation or taper.

5. a kind of interior needle stand structure of changed pin that is used for safety self-destructing syringe according to claim 1; It is characterized in that: the said outer wall place, bottom, pin department of assembly (3) that changes forms annular seal ring assembling groove (7), form circular step (11) between annular seal ring assembling groove (7) and elastic packing limiting section (4) top or ring-type domatic.

6. a kind of interior needle stand structure of changed pin that is used for safety self-destructing syringe according to claim 1; It is characterized in that: the height of said ring-type buffer gap (5) notch to bottom land is 0.05mm-4mm; The width of ring-type buffer gap (5) is 0.05mm-4mm; The distance on ring-type buffer gap (5) outside cell wall and the spacing holding section of annular seal (6) surperficial cambered surface arc top is 0.1mm-6mm; Distance between cell wall notch place, the outside, ring-type buffer gap (5) and the spacing holding section of annular seal (6) outer wall is 0.1mm-6mm, and the distance between ring-type buffer gap (5) cell wall bottom land place, the outside and the spacing holding section of annular seal (6) outer wall is 0.1mm-6mm.

7. a kind of interior needle stand structure of changed pin that is used for safety self-destructing syringe according to claim 1, it is characterized in that: the surface of the spacing holding section of annular seal (6) becomes arc surfaced.

8. a kind of interior needle stand structure of changed pin that is used for safety self-destructing syringe according to claim 1; It is characterized in that: the spacing holding section of said annular seal (6) surface becomes arc surfaced, and its arc pushes up to the distance of cambered surface top edge and pushes up to the distance of cambered surface lower limb less than arc.

9. a kind of interior needle stand structure of changed pin that is used for safety self-destructing syringe according to claim 1, it is characterized in that: elastic packing limiting section (4) the outer wall place of bottom, the spacing holding section of said annular seal (6) forms annular recess (10).

10. a kind of interior needle stand structure of changed pin that is used for safety self-destructing syringe according to claim 9, it is characterized in that: the bottom land of said annular recess (10) and ring-type buffer gap (5) is positioned at same horizontal plane or is higher than the bottom land of ring-type buffer gap (5).

11. a kind of interior needle stand structure of changed pin that is used for safety self-destructing syringe according to claim 5, it is characterized in that: said annular seal ring assembling groove (7) locates to be socketed with " O " shape O-ring seal.

12. a kind of interior needle stand structure of changed pin that is used for safety self-destructing syringe according to claim 1, it is characterized in that: said elastic packing limiting section (4) upper surface or lower surface offer ring-type buffer gap (5).

13. a kind of interior needle stand structure of changed pin that is used for safety self-destructing syringe according to claim 1; It is characterized in that: said elastic packing limiting section (4) is arranged at and can changes pin department of assembly (3) at or middle section or place, top, and both are integrally formed formula monomer structure or split type assembly structure.

14. a kind of interior needle stand structure of changed pin that is used for safety self-destructing syringe according to claim 1, it is characterized in that: the spacing holding section of annular seal (6) of said elastic packing limiting section (4) outer wall is located to form some breach or is cut off line.