CN103285466B - Needle head pull-back type safe self-destruction syringe - Google Patents

Abstract

The invention discloses a needle head pull-back type safe self-destruction syringe, which comprises a barrel body, wherein an inner needle seat body is arranged in a barrel neck at the end part of the barrel body, an elastic buffering limiting mechanism is formed between the barrel neck and the inner needle seat body, an asymmetric pull-back locking piece with an elastic function is arranged at the end part of a syringe core rod, the elastic function can realize clamping and locking with an outer sleeve type pull-back locking component in an inner cavity of a needle seat, under the stress environment of asymmetric acting force, the needle seat can form deflection at one side after being pulled back like the barrel body, the injection needle can be inverted to one side of the inner wall of the barrel body in the direction of nearly forty-five angles and is locked by the neck of the barrel body, so that the injection needle and the needle seat cannot be pushed out of the neck of the barrel body again, secondary damage. The asymmetric elastic pull-back locking piece is a plastic barb body, and the asymmetric elastic pull-back locking piece and the core rod are molded in one-step die opening mode.

Description

A kind of syringe needle return type safe self-destroying syringe

Technical field

The present invention relates to the technical field of medicine equipment, specifically a kind of syringe needle return type safe self-destroying syringe, particularly its mechanical connecting structure.

Background technology

Documents one, the patent No.: ZL200710047077.4, the applying date: 2007.10.16, notification number: CN101411908, patentee: Shanghai DingJianTang biochemistry Science Co., Ltd, this case discloses " a kind of safe self-destruction type vaccine injector ", comprise cylindrical shell, in cylindrical shell, be provided with core bar, core bar is provided with plug near end, in the cylinder neck of cylindrical shell, be provided with syringe needle, syringe needle place is provided with needle tubing, it is characterized in that: the body of rod sidewall of described core bar end is provided with horizontal cut, longitudinal breach at horizontal cut and body of rod place, core bar end is connected, horizontal cut matches with longitudinal breach, syringe needle is socketed to form by upper needle stand and lower needle stand, lower needle stand inner chamber hollow, lower needle stand becomes tubular structure, lower needle stand is provided with lower needle holder convex tendon with respect to the other end opening part inwall of installing needle holder, core bar end is provided with the elastomer being formed with longitudinal breach UNICOM by horizontal cut, the core bar body of rod herein has certain elasticity, wherein longitudinally 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 herein, horizontal cut can be high outside and low outside shape, it is circular-arc that core bar end becomes, upper needle stand becomes bar shape, upper needle stand outer wall epimere is provided with reinforcement fin, upper needle stand outer wall hypomere is provided with the fixing bulge loop of needle stand, the overall diameter of the fixing bulge loop of upper needle stand is greater than needle stand outer diameter 0.05mm-0.3mm, described lower needle stand becomes bar shape, its inner chamber hollow, lower needle stand cavity inner wall place is provided with lower needle holder annular fixed groove, lower needle holder annular fixed groove can match with the fixing bulge loop of upper needle stand, the internal diameter of lower needle holder annular fixed groove upper chamber is less than the fixing external wall external diameter of the bulge loop upper bar 0.1mm-0.35mm of needle stand, the fixing external wall external diameter of bulge loop lower pole of internal diameter≤upper needle stand of lower needle holder annular fixed groove lower cavity, lower needle stand is provided with lower needle holder annular convex rib with respect to the other end outer wall end of lower needle holder bulge loop, the cylinder neck inwall place of described cylindrical shell is respectively equipped with a neck upper limit ring and cylinder neck lower limit ring, distance between cylinder neck upper limit ring and cylinder neck lower limit ring is 0.3mm-1.5mm, cylinder neck upper limit ring protrudes from inwall 0.1mm-0.6mm between a neck upper limit ring and cylinder neck lower limit ring, cylinder neck lower limit ring protrudes from inwall 0.02mm-0.25mm between a neck upper limit ring and cylinder neck lower limit ring, the internal diameter of cylinder lumen between internal diameter >=cylinder neck upper limit ring of cylinder neck upper limit ring top cylinder lumen and cylinder neck lower limit ring, the internal diameter of internal diameter≤cylinder neck lower limit ring bottom cylinder lumen of cylinder lumen between cylinder neck upper limit ring and cylinder neck lower limit ring, between cylinder neck upper limit ring and cylinder neck lower limit ring, the internal diameter of cylinder lumen is less than lower needle holder annular convex rib external diameter 0.1mm-0.5mm, cylinder lumen is provided with cylindrical shell limit rib with respect to the other end inwall place of cylinder neck, cylindrical shell limit rib can be linear annular muscle, many the annular muscle that perpendicular muscle forms, , a perpendicular muscle, the annular muscle that multiple raised points form, the cylinder inboard wall place of cylindrical shell limit rib bottom is provided with cylindrical shell inner convex rib, the thickness of the distance >=annular stop sheet between cylindrical shell limit rib and cylindrical shell inner convex rib, the internal diameter at cylindrical shell limit rib place is less than the diameter of annular stop sheet.

Documents two, the patent No.: ZL200720067715.4, the applying date: 2007.03.08, notification number: CN201076648, patentee: Shanghai DingJianTang biochemistry Science Co., Ltd, this case discloses " a kind of core bar with Metallic hook structure ", comprise core bar body, the upper end of core bar body is provided with column fastener, and column fastener place is socketed with plug, it is characterized in that: described plug place is provided with installing hole, is provided with barbed body in installing hole.

In existing safety injector structure, have the function of utilizing barbed body to realize needle retractable, realize safety injection, general barbed body is metalwork or working of plastics. Metalwork need to be processed and coordinates with core bar or assemble, complex manufacturing technology, difficulty is large 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 the hidden danger of product aspect security and product quality. Structurally still there is defect or incomplete place and therefore cause product in use to have potential safety hazard or security breaches in existing plastics barb member. The design of existing plastics back-off part, though can realize the syringe needle function of pulling back, in use, syringe needle is still in normal trace after being pulled back, syringe needle is likely again released and is caused user by the risk of secondary damage.

In addition, all there is a same difficult problem in existing single needle seat pumpback formula safety self-destructing syringe or safety injector, is exactly how to solve to engage between interior needle stand and cylindrical shell stablize and reach certain intensity to meet stability requirement; Meanwhile, in the time of pumpback needle stand, required pulling force can not be too greatly with easy to use. Although rigid fit structure can reach the stable locking effect of interior needle stand and cylinder inboard wall, be difficult to or even cannot reach demand easy to use simultaneously. 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 in production process, quality and precision are all difficult to control, and almost cannot realize batch production.

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

Summary of the invention

The object of the present invention is to provide a kind of syringe needle pulling-back type safety self-destruction type syringe capable of changing needle. In syringe, between needle stand and injector cartridge, mutually lock by elastic buffering mechanism, utilize the distortion of buffer gap to produce expansionary force, realize both lockings and depart from effect. This elastic buffering mechanism can be arranged at interior needle stand place, also can be arranged at cylinder inboard wall place, and meanwhile, interior needle stand and cylindrical shell place all form the elastic buffer snap fastener that can cooperatively interact. Core bar end is provided with the asymmetric locking piece with spring function, and this locking piece can lock by engaging mode mutually with syringe needle inner chamber. Pulled back to after in injector cartridge when needle stand, under the strength effect of Asymmetric Elasticity structure, needle stand can stressedly be taken advantage of a situation and be turned to a lateral deviation; Therefore entry needle can swing to cylinder inboard wall one side with nearly 45 angular direction, and locked by cylindrical shell neck, cause thus entry needle and needle stand again to be released cylindrical shell neck, effectively prevent that syringe needle from being released the secondary damage that causes again, realize the safety self-destruct operation of syringe, overcome the shortcoming and defect existing in prior art.

To achieve these goals, technical scheme of the present invention is: a kind of syringe needle return type safe self-destroying syringe. It comprises cylindrical shell; In the cylinder neck of described cylindrical shell end, be provided with needle stand body; In cylindrical shell, be provided with core bar; Core bar is provided with plug near end. It is characterized in that: described needle stand body top is placed in a neck, needle stand body stage casing forms elastic packing limiting section, needle stand body bottom and the jacket-type locked component of pulling back is connected, elastic packing limiting section surface offers ring-type buffer gap, the elastic packing limiting section outer wall place in outside, ring-type buffer gap forms the spacing holding section of annular seal, and core bar end is provided with Asymmetric Elasticity and locks the part of pulling back.

The invention discloses a kind of syringe needle return type safe self-destroying syringe. The end of its syringe core rod is provided with the asymmetric locking piece of pulling back with spring function; Unsymmetric structure coordinates spring function design can guarantee that this locking piece can insert needle stand inner chamber smoothly, and utilizes the function of its elastic dilatation, realizes asymmetric holding section, both sides and the jacket-type of the needle stand inner chamber locked component holding section of pulling back and engages and lock. Because the pull back annular groove of locked component card inner chamber of jacket-type also has elastic buffer characteristic, therefore with the asymmetric locking piece of pulling back in the time that advanced state is touched, both meetings produce buffering distortion relatively, be convenient to locking piece and snap in the jacket-type locked component inner chamber of pulling back, and in the time of locking piece pumpback and the jacket-type locked component of pulling back mutually lock. When needle stand is pulled back to after in injector cartridge, under the force environment of asymmetric active force, needle stand can form deflection to a side, therefore entry needle can swing to cylinder inboard wall one side with nearly 45 angular direction, and locked by cylindrical shell neck, cause thus entry needle and needle stand cannot again be released cylindrical shell neck, effectively prevent that syringe needle from again being released and causing secondary damage, really realize the safety self-destruct operation of syringe. In the time that the present invention specifically implements, the described Asymmetric Elasticity locking piece of pulling back is a plastics barbed body. This plastics barbed body adopts the design principle of asymmetry and the ingenious cooperation of elastomer structure, uses specific angle and size design, makes barb body possess elastic buffer lock function. Above-mentioned Asymmetric Elasticity pull back locking piece and core bar into a single integrated structure, global facility adopts a die sinking moulding, without separately processing or follow-up assembling, effectively reduces manufacturing cost, has simplified assembly technology, has reduced assembly process. Product uses simple to operate, stable working state. The pull back snap lock effect of part and needle stand inner chamber of the Asymmetric Elasticity of core bar end is splendid, product reasonable integral structure, be skillfully constructed, be easy to apply, compare existing product design and technology, in design, there is significant technical breakthrough, and there is outstanding security and practicality feature.

Brief description of the drawings

Fig. 1 is structural representation of the present invention.

Fig. 2 is needle stand body of the present invention and the jacket-type locked component installation diagram of pulling back.

Fig. 3 is barbed body structural representation of the present invention.

Fig. 4 is that the present invention first uses state diagram.

Fig. 5 is that the present invention second uses state diagram.

Fig. 6 is that the present invention the 3rd uses state diagram.

Detailed description of the invention

With reference to the accompanying drawings, the present invention is further described.

The present invention is a kind of syringe needle return type safe self-destroying syringe, it comprises cylindrical shell 1, in the cylinder neck 2 of described cylindrical shell 1 end, be provided with needle stand body 3, in cylindrical shell 1, be provided with core bar 8, core bar 8 is provided with plug 9 near end, it is different from prior art and is: described needle stand body 3 tops are placed in a neck 2, needle stand body 3 stage casings form elastic packing limiting section 4, needle stand body 3 bottoms and the jacket-type locked component 5 of pulling back is connected, elastic packing limiting section 4 surfaces offer ring-type buffer gap 6, the elastic packing limiting section 4 outer wall places in 6 outsides, ring-type buffer gap form the spacing holding section 7 of annular seal, core bar 8 ends are provided with Asymmetric Elasticity and lock the part 10 of pulling back. described elastic packing limiting section makes can reach the stable requirement engaging between interior needle stand body and cylindrical shell, can realize again the light effect exiting.

The one or both sides that above-mentioned Asymmetric Elasticity locks the part of pulling back form elastic mechanism, and the pull back sidepiece outer end of part one side elastic mechanism of this Asymmetric Elasticity locking protrudes from the pull back outer wall of part and body of rod connecting portion of this Asymmetric Elasticity locking, kayser effect and the deflection that just can guarantee itself and needle section like this.

In the specific implementation, it is a barbed body that described Asymmetric Elasticity locks the part 10 of pulling back, and described barbed body is plastic material, and into a single integrated structure with 8 of core bars, a die sinking moulding, or 8 one-tenth split type assembly structures of barbed body and core bar.

In the specific implementation, above-mentioned barbed body also can pass through other assembly structure, is assembled to core bar end.

In the specific implementation, described barbed body lower end forms base portion 11, the first folding arm 12 turning to a lateral deviation is formed at base portion 11 tops, the junction lateral wall of the first folding arm 12 and base portion 11 forms 13 jiaos, circular arc or the knuckle of inner concavity, this arc chord angle is 45 degree to 179 degree, the lower end of the first folding arm 12 is connected with the upper end of base portion 11, the upper end of the first folding arm 12 is connected with second folding arm 14 one end, second folding arm 14 other ends are unsettled, the outside of the first folding arm 12 and the second folding arm 14 junctions forms arc surface 15, the inner side of the first folding arm 12 and the second folding arm 14 junctions forms the interior angle 17 of 2 degree to 90 degree, the width that forms opening between the free end of the second folding arm 17 and the first folding arm 15 is 0.5mm-40mm, the length of described the first folding arm 12 is 0.5mm-50mm, the length of described the second folding arm 14 is 0.5mm-60mm. so project organization just can be guaranteed kayser effect and the deflection of itself and needle section.

In the specific implementation, described core bar 8 places form the reinforcement 18 that the angles such as four cross distribute, reinforcement 18 outer edge are provided with spacing tabs 19, between described spacing tabs 19 and reinforcement 18, be connected by least two contacts 20, after syringe has assembled, the top of spacing tabs just upwards props up cylindrical shell lower end, prevents that syringe is subject to External Force Acting before using, cause core bar displacement forward, cause syringe surprisingly to be scrapped. When use, only need bend along contact spacing tabs, just can be by it from reinforcement cracking-off.

In the specific implementation, described ring-type buffer gap 6 is ring channel structures, its notch to the height of bottom land is 0.05mm-4mm, the width of ring-type buffer gap 6 is 0.05mm-4mm, the distance on ring-type buffer gap 6 outside cell walls and the spacing holding section 7 of annular seal surperficial cambered surface arc top is 0.1mm-6mm, distance between 6 cell wall notch places, outside, ring-type buffer gap and the spacing holding section of annular seal 7 outer walls is 0.1mm-6mm, distance between 6 cell wall bottom land places, outside, ring-type buffer gap and the spacing holding section of annular seal 7 outer walls is 0.1mm-6mm, the surface of the spacing holding section 7 of annular seal becomes arc surfaced, the spacing holding section of annular seal 7 arcing surfaces push up and are less than arc to the distance of cambered surface top edge and push up to the distance of cambered surface lower limb, the elastic packing limiting section 4 outer wall places of 7 bottoms, the spacing holding section of described annular seal form annular recess 22.

In the specific implementation, described annular recess 22 is positioned at same level or the bottom land higher than ring-type buffer gap 6 with the bottom land of ring-type buffer gap 6.

In the specific implementation, cylinder neck 2 outer cover of described cylindrical shell 1 are connected to cylindrical shell sheath 23.

In the specific implementation, the cylinder neck 2 inwall places of described cylindrical shell 1 are provided with the spacing depression 24 of annular seal matching with the spacing holding section 7 of annular seal, the degree of depth of the spacing depression 24 of annular seal is 0.01mm-4mm, the height of the spacing depression 24 of annular seal is 0.01mm-6mm, and the concave bottom of the spacing depression 24 of annular seal becomes arc surfaced.

In the specific implementation, described needle stand body 3 exterior wall places form at least one position limiting convex ring 25, and the jacket-type interior cavity wall of locked component 5 place that pulls back is provided with the annular spacing groove 26 matching with position limiting convex ring 25.

In the specific implementation, the described jacket-type locked component 5 inner chamber hollows of pulling back, in it, cavity wall forms ring-type snap-in lock bonding part 27 near lower ending opening place.

In the specific implementation, annular groove 28 is formed at the top of described ring-type snap-in lock bonding part 27, the thickness of annular groove 28 madial walls 29 is 0.01mm-3mm, annular groove 28 madial walls and annular groove 28 lateral walls 30 form 2 degree to 90 degree angles, the interior diameter that annular groove 28 madial wall upper ends form is 1mm-80mm, and the width of rebate of described annular groove 28 is greater than the low width of groove.

In practical operation, as shown in Fig. 3 to Fig. 4, start injection after imbibition, core bar is slowly advanced, because the pull back overall width of part of Asymmetric Elasticity locking is greater than the jacket-type locked component place annular groove internal diameter of pulling back, after therefore both touch, Asymmetric Elasticity locking is pulled back after part one side distortion, make to enter after narrowed width the jacket-type locked component inner chamber of pulling back, when entering after inner chamber, stressed effect loses, Asymmetric Elasticity locks the part of pulling back and recovers original form, now, injection completes, pull back core bar, this Asymmetric Elasticity locking part (free end of barbed body the second folding arm) side of pulling back is just stuck in jacket-type and pulls back in the annular groove of locked component, under the effect of core bar pulling force, pulling force conducts to needle stand body place by the jacket-type locked component of pulling back, the elastic packing limiting section place ring-type buffer gap stress deformation of needle stand body, along with ring-type buffer gap narrows, the spacing holding section of annular seal skids off in the spacing depression of annular seal of cylindrical shell, last whole needle section is drawn into cylinder lumen, lock at Asymmetric Elasticity under the effect of the part of pulling back, needle section turns to a lateral deviation, depart from normal displacement track, therefore cannot again be assembled in a neck, realize the safety self-destruct operation of syringe.

Above content is in conjunction with concrete preferred embodiment further description made for the present invention, can not assert that the concrete enforcement of the present invention is confined to above-mentioned these explanations. For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.

Claims (1)

1. a syringe needle return type safe self-destroying syringe, it comprises cylindrical shell (1), in the cylinder neck (2) of described cylindrical shell (1) end, be provided with needle stand body (3), in cylindrical shell (1), be provided with core bar (8), core bar (8) is provided with plug (9) near end, it is characterized in that: described needle stand body (3) top is placed in a neck (2), needle stand body (3) stage casing forms elastic packing limiting section (4), needle stand body (3) bottom and the jacket-type locked component (5) of pulling back is connected, elastic packing limiting section (4) surface offers ring-type buffer gap (6), elastic packing limiting section (4) the outer wall place in outside, ring-type buffer gap (6) forms the spacing holding section of annular seal (7), core bar (8) end is provided with Asymmetric Elasticity and locks the part (10) of pulling back, it is a barbed body that described Asymmetric Elasticity locks the part (10) of pulling back, described barbed body is plastic material, and portion is into a single integrated structure with core bar (8), a die sinking moulding, or barbed body becomes split type assembly structure with core bar (8), described barbed body lower end forms base portion (11), the first folding arm (12) turning to a lateral deviation is formed at base portion (11) top, the junction lateral wall of the first folding arm (12) and base portion (11) forms circular arc (13) angle or the knuckle of inner concavity, this arc chord angle is 45 degree to 179 degree, the lower end of the first folding arm (12) is connected with the upper end of base portion (11), the upper end of the first folding arm (12) is connected with the second folding arm (14) one end, the second folding arm (14) other end is unsettled, the first folding arm (12) forms arc surface (15) with the outside of the second folding arm (14) junction, the first folding arm (12) forms the interior angle (17) of 2 degree to 90 degree with the inner side of the second folding arm (14) junction, the width that forms opening between the free end of the second folding arm (17) and the first folding arm (15) is 0.5mm-40mm, the length of described the first folding arm (12) is 0.5mm-50mm, the length of described the second folding arm (14) is 0.5mm-60mm, described core bar (8) locates to form the reinforcement (18) that the angles such as four cross distribute, reinforcement (18) outer edge is provided with spacing tabs (19), between described spacing tabs (19) and reinforcement (18), be connected by least two contacts (20), the free end of described the second folding arm (14) forms thorn point (21), and the free end of the second folding arm (14) protrudes from base portion (11) outer ledge, described ring-type buffer gap (6) is ring channel structures, its notch to the height of bottom land is 0.05mm-4mm, the width of ring-type buffer gap (6) is 0.05mm-4mm, the distance on ring-type buffer gap (6) outside cell wall and the spacing holding section of annular seal (7) surperficial cambered surface arc top is 0.1mm-6mm, distance between cell wall notch place, outside, ring-type buffer gap (6) and the spacing holding section of annular seal (7) outer wall is 0.1mm-6mm, distance between cell wall bottom land place, outside, ring-type buffer gap (6) and the spacing holding section of annular seal (7) outer wall is 0.1mm-6mm, the surface of the spacing holding section of annular seal (7) becomes arc surfaced, the spacing holding section of annular seal (7) arcing surface pushes up and is less than arc to the distance of cambered surface top edge and pushes up to the distance of cambered surface lower limb, elastic packing limiting section (4) the outer wall place of bottom, the spacing holding section of described annular seal (7) forms annular recess (22), described annular recess (22) is positioned at same level or the bottom land higher than ring-type buffer gap (6) with the bottom land of ring-type buffer gap (6), cylinder neck (2) outer cover of described cylindrical shell (1) is connected to cylindrical shell sheath (23), cylinder neck (2) the inwall place of described cylindrical shell (1) is provided with the spacing depression of annular seal (24) matching with the spacing holding section of annular seal (7), the degree of depth of the spacing depression of annular seal (24) is 0.01mm-4mm, the height of the spacing depression of annular seal (24) is 0.01mm-6mm, the concave bottom of the spacing depression of annular seal (24) becomes arc surfaced, described needle stand body (3) exterior wall place forms at least one position limiting convex ring (25), the jacket-type interior cavity wall of locked component (5) place that pulls back is provided with the annular spacing groove (26) matching with position limiting convex ring (25), described jacket-type locked component (5) the inner chamber hollow of pulling back, in it, cavity wall forms ring-type snap-in lock bonding part (27) near lower ending opening place, annular groove (28) is formed at the top of described ring-type snap-in lock bonding part (27), the thickness of annular groove (28) madial wall (29) is 0.01mm-3mm, annular groove (28) madial wall and annular groove (28) lateral wall (30) form 2 degree to 90 degree angles, the interior diameter that annular groove (28) madial wall upper end forms is 1mm-80mm, the width of rebate of described annular groove (28) is greater than the low width of groove.