CN201139840Y

CN201139840Y - Non-fittings ring withdrawing fastener and blowing piston preventing edge of plastic injector

Info

Publication number: CN201139840Y
Application number: CNU2008200617603U
Authority: CN
Inventors: 阎侗有
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-01-14
Filing date: 2008-01-14
Publication date: 2008-10-29
Anticipated expiration: 2018-01-14

Abstract

The utility model relates to a bare withdrawal-resistant ring clip and a piston skirt margin for preventing air leakage of a plastic injector. The inner surface of the proximal end of an injecting cylinder is provided with a split convex ring (10) with double bevels, and the lateral wall (6) of a core bar piston tray (5) is provided with an elastic withdrawal -resistant ring clip (7) which inclines toward the proximal end of the injecting cylinder. When a core bar is withdrawn, the ring clip is blocked to be clipped when sliding to a right angle corner (8) of the convex ring, a rubber piston (2) cannot be drawn out of the injecting cylinder, thereby preventing a destructive mechanism from being damaged and realizing safe injection. The lateral wall of the piston is provided with a narrow and thin piston skirt margin (4) which inclines towards the proximal end of the injecting cylinder, thereby ensuring that the injector does not leak air when taking out liquid, at the same time, reducing the resistance when the core bar pushes and pulls. The bare withdrawal-resistant ring clip and a piston skirt margin are mainly applied to the injectors of various sizes.

Description

Plastic injector does not have the accessory resistance and moves back ring card and gas-proof piston shirt rim

Affiliated technical field

This utility model relates to a kind of plastic injector not to be had accessory resistance and moves back ring card and gas-proof piston shirt rim, belongs to the medical disposable material technical field.

Background technology

The development of syringe products is divided into three phases, and the first generation (1G) syringe is the glass injection.The second filial generation (2G) plastic injector is the new product that U.S. company BD was released to market in 1961.Through the uses of four more than ten years practice, find to have and reuse and problems such as shared, especially with different medical unit for very, cause the pathophorous extensive diffusive of menses, wherein endanger maximum with hepatitis and acquired immune deficiency syndrome (AIDS).Therefore, present global researcheres are being developed the third generation (3G) plastics self-destroy safety injector (being called for short the ADS syringe).

From environmentally safe angle, require to use later 2G and 3G syringe piston can not extract out outside the injection tube (overcoat), otherwise the dangerous debris in the injection tube will be polluted external environment.For the ADS syringe, piston can not be extracted out outside the injection tube before using, otherwise delinquenent element can destroy self-desttruction equipment, reach and reuse or shared purpose.

Present most 2G and 3G syringe there is no piston resistance unloading device.

The plastic injector that the resistance unloading device is arranged is not that structure has increased production cost (for example circle is moved back in the elasticity resistance in " double locking and disengaging self-destroy safety injector ", and ZL 200620035605.5) than complexity, is that poor effect is moved back in resistance.Piston can be drawn out of outside the injection tube when product that for example has was exerted oneself the pumpback core bar; When the Two Piece Set product that has was exerted oneself the pumpback core bar, plastic piston can not be drawn out of, but with the core bar pumpback of exerting oneself while waving, piston still can be drawn out of.

According to disposable sterilized syringe national standard (GB), need to adopt the mechanical test instrument that piston is carried out the sliding capability test.If design piston diameter than injection tube internal diameter more greatly, though be not easy gas leakage, leakage, push-and-pull action power (resistance) increases, bad use; If piston diameter is done a little bit smaller, though the push-and-pull resistance has reduced, easily gas leakage does not meet the requirement of national standard about device body adaptation.It more than is the present ubiquitous weak point of plastic injector.

Summary of the invention

The technical problem that solves: in order to overcome the above-mentioned defective that existing resistance unloading device and piston exist, this utility model provides a kind of does not need the elasticity resistance of spare and accessory parts to move back ring card and a kind of rubber piston with the shirt rim.

The technical scheme that its technical problem that solves this utility model adopts is: at the proximal injection tube inner surface of plastic injector a Contiuum type double inclined plane resistance is set and moves back bulge loop (abbreviation bulge loop, down with), the peak value thickness of bulge loop is can the mandatory demoulding successfully being standard.After injection molded, because outer mold non-resistance, the at first demoulding.When inner mold carried out the mandatory demoulding, the interior inclined-plane pressurized of bulge loop forced the injection tube proximal end to expand, and inner mold is the demoulding smoothly just.

Bevel edge in the bulge loop and injection tube inner surface are designed to right angle corner.The diameter of core bar piston pallet (pallet) is designed to equate with the interior diameter of bulge loop peak value.The elasticity resistance of tilting to the injection tube proximal end is set on pallet side wall moves back ring card (ring card).Ring card can be set as monolayer, also can be multilamellar, and the ring card can be set as single page type, can also be set as multileaf type, and the overall diameter that will encircle card is designed to be slightly larger than the injection tube inner surface diameter, makes ring tighten subsides injection tube inner surface.On section, the angle that thin-walled ring card and pallet form should be slightly larger than 45 degree, in case stop ring slippage when being stuck in pumpback.

Design rubber piston more loosening, reducing the push-and-pull resistance of core bar, and the shirt rim that tilts to the injection tube proximal end is set on piston side wall, the shirt rim width is narrow and wall thin, is close to the inner surface of injection tube.When core bar was pulled back drawing liquid injection tube inner chamber formation negative pressure, external atmosphere pressure was pressed on the shirt rim on the inner surface of injection tube, guarantees the unlikely gas leakage of piston.

During assembling, pin head is inserted piston fix, firmly insert then in the injection tube, the outer inclined-plane of bulge loop plays guiding and the proximal effect of expansion injection tube, and piston and pallet are entered in the injection tube smoothly.During the pumpback core bar, be obstructed in the right angle corner place that the ring card slides into inclined-plane in the bulge loop.Reuse power pumpback core bar, ring blocks the expansion of being obstructed, and pushes up barrel wall tighter, thereby guarantees that piston is not drawn out outside the injection tube.

The beneficial effects of the utility model are: because the resistance unloading device does not have accessory, reduce thereby produce instinct, and guarantee the safety of syringe.The rubber piston shirt rim can prevent gas leakage, reduces the push-and-pull resistance of core bar simultaneously, and properties of product are improved.

Description of drawings

Below in conjunction with drawings and Examples this utility model is further specified.

Fig. 1 is a vertical section of the present utility model structural map.

Fig. 2 is the I-I cross-sectional schematic of Fig. 1.

Fig. 3 is the vertical section structural map of rubber piston.

Fig. 4 is the I-I cross-sectional schematic of Fig. 3.

Fig. 5 is the vertical section structural map of core bar.

Fig. 6 is a core bar piston pallet single page type ring card I-I cross-sectional schematic.

Fig. 7 is a core bar piston pallet multileaf type ring card I-I cross-sectional schematic.

Among the figure: 1. injection tube (overcoat), 2. rubber piston (piston), 3. pin head, 4. piston shirt rim, 5. piston pallet (pallet), 6. pallet side wall, 7. ring card (ring card), 8. bulge loop right angle corner, 9. inclined-plane in the bulge loop are moved back in the elasticity resistance, 10. bulge loop (bulge loop) is moved back in the resistance of Contiuum type double inclined plane, 11. the outer inclined-plane of bulge loop, 12. handles (overcoat crimping), 13. core bars, 14. multileaf type ring card, 15. single page type ring cards.

The specific embodiment

In Fig. 1, behind injection tube (1) injection molded, because the outer mold non-resistance at first is removed, when fixedly injection tube was exerted oneself the pumpback inner mold, outwards expansion of inclined-plane (9) forced the injection tube proximal end to expand in the bulge loop, made the mandatory demoulding success of inner mold.During assembling, earlier pin head (3) is inserted rubber piston (2) internal fixation, to firmly insert in the injection tube with the core bar (13) of piston then, this moment piston retraction, also pressurized contraction of ring card (Fig. 1 .7, Fig. 6 .15, or Fig. 7 .14) is moved back in the elasticity resistance, the injection tube proximal end slightly expands simultaneously, makes mandatory the entering in the injection tube of piston and pallet (5).During the pumpback core bar, ring card slides into bulge loop right angle corner (8) and locates to be obstructed and block.If reuse power pumpback core bar pushes up the injection tube inner surface tighter after the ring card is obstructed, guarantee that piston can not be drawn out of outside the injection tube.

At Fig. 1, among Fig. 3 and Fig. 4, when core bar is pulled back drawing liquid, injection tube inner chamber and contain and to form negative pressure in the medicine bottle, the atmospheric pressure of injection tube exocoel presses piston shirt rim (4), can guarantee that drawing liquid penetrates air tight.

Claims

1. a plastic injector does not have the accessory resistance and moves back ring card and gas-proof piston shirt rim, it is characterized in that: the elasticity resistance is set on the sidewall of core bar rubber piston pallet moves back the ring card, on injection tube proximal end inwall, establish the resistance of Contiuum type double inclined plane and move back bulge loop, and on the sidewall of piston, establish the piston shirt rim.

2. plastic injector according to claim 1 does not have the accessory resistance and moves back ring card and gas-proof piston shirt rim, it is characterized in that: the elasticity resistance is moved back the ring card and is tilted to the injection tube proximal end.

3. plastic injector according to claim 1 does not have the accessory resistance and moves back ring card and gas-proof piston shirt rim, it is characterized in that: the interior bevel edge and the rectangular turning of injection tube inner surface of bulge loop moved back in the resistance of Contiuum type double inclined plane.

4. plastic injector according to claim 1 does not have accessory resistance and moves back ring card and gas-proof piston shirt rim, and it is characterized in that: the piston shirt rim tilts to the injection tube proximal end, and the shirt rim width is narrow and wall approaches.