CN201143332Y

CN201143332Y - Disposable syringe piston

Info

Publication number: CN201143332Y
Application number: CNU2008200022903U
Authority: CN
Inventors: 房东森; 王晓华; 鞠竹清
Original assignee: Individual
Current assignee: FANG DONGSEN
Priority date: 2008-01-27
Filing date: 2008-01-27
Publication date: 2008-11-05
Anticipated expiration: 2018-01-27

Abstract

The utility model relates to a one-off injector piston; the main body of the one-off injector piston is a cylinder with a through hole in the center; the inside of the one-off injector piston is provided with a die cavity used for connecting a push rod; the outer circumferential surface of the piston is provided with two seal rings that incline forwards and backwards and are mutually corresponding to each other as well as an annular axial direction groove which is tangent to the back end surface of the seal ring inclining backwards; the top surface of the piston is inosculated with the front end of an outer coat matched with the piston; the top surface of an annular central through hole is provided with an annular groove; the bottom surface is provided with an internal incline and a closed annular heave. The seal ring of the utility model is provided with an annular surface which is parallel to the inner wall of the outer coat and is excellently contacted with a syringe; the resistance is small and the seal property is good. Compared with the existing injection piston, the one-off injector piston has higher sensitivity; each part of the piston can be correspondingly matched with the push rod to carry out seal with the outer coat with the change of the pressure in the syringe; the piston of the utility model is an ideal one-off injector piston.

Description

The disposable syringe piston

Affiliated technical field

This utility model relates to a kind of medical apparatus and instruments, specifically a kind of disposable syringe piston.

Background technology

Piston is indispensable parts in the syringe, in order to prevent piston leakage on every side, obtain a good leakproof seal effect, piston must compress cylinder inboard wall, if cylinder inboard wall is smooth inadequately, piston just is difficult to move in cylindrical shell, and the operator must just can make piston move with bigger power, the problem of frictional resistance between the piston that how to reduce the injector cartridge inwall and slide within it becomes a great problem that present syringe piston structure designs.

Prior art makes and with lubricator reduces frictional resistance between piston and the cylinder inboard wall, a kind of lubricant that generally uses is silicone oil, but use this lubricant and be out of favour, because this lubricant is understood disperse or is dissolved in the medicinal liquid, thereby medicinal liquid is polluted, therefore people once attempted exploring not with lubricator and syringe piston still can leakproof and method that piston is slided easily, this trial comprises uses various piston profile, for example: Chinese patent 20042004059.2 discloses a kind of name and has been called: " a kind of injector rubber piston ", its main body of this kind piston is cylinder, the outside is provided with three all ring-type boss, the top is a flat-top, inside is the cascade ring cavity, but this piston can not be with the tightness between automatic adjusting of the variation of cylinder internal pressure and barrel, can not effectively reduce the frictional resistance between piston and the barrel, not reach comparatively ideal effect.

Summary of the invention

Technical problem to be solved in the utility model is: the frictional resistance between a kind of energy minimizing and the injection tube inwall is provided, still can keeps the disposable syringe piston with the cylinder inboard wall sealing simultaneously.

In order to solve above-mentioned technical problem, this utility model adopts following technical scheme: a kind of disposable syringe piston, its main body is the cylinder of central through hole, inside is provided with the die cavity that is used to connect push rod, it is characterized in that: the outer circumference surface of piston be provided with two tilt forward and back mutual symmetric sealing ring and with the tangent annulate shaft of the rear end face of rear-inclined sealing ring to groove, the end face of piston matches with the overcoat front end that matches with it, ring central through hole end face is provided with annular groove, the annular protrusion of inclined-plane and sealing in the bottom surface is provided with, make and be not easy distortion between the piston bottom periphery, and push pedal had the fastening effect, make can seal better between syringe inwall and the piston.

The sealing ring of disposable syringe piston described in the utility model is provided with perpendicular end surface, and end face and perpendicular end surface form the inclined-plane of a diameter less than sealing ring.

The end face of disposable syringe piston described in the utility model can be the taper top of sealing, and its internal cavity and push rod installation position match.

Compare with existing syringe piston, the sensitivity of this utility model piston is higher, along with each position of the variation piston of cylinder internal pressure can correspondingly cooperate push rod and overcoat to seal, is a kind of ideal disposable syringe piston.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the structural representation of embodiment of the present utility model.

Among Fig. 1: 1. sealing ring before, 2. increasing back sealing ring, 3. base ring, 4. angle, 5. groove, 6. front end face, 7. rear end face, 8. die cavity, 9. annular groove, 10. in the inclined-plane, 11. end faces, 12. annular protrusions

Among Fig. 2: 1. taper top, 2. stairstepping cavity,

The specific embodiment

Fig. 1 is a structural representation of the present utility model, this utility model disposable syringe piston as we know from the figure, its main body is the cylindrical of central through hole, inside is provided with the die cavity 8 that is used to connect push rod, the outer circumference surface of piston is provided with two and tilts forward and back mutual symmetric sealing ring 1 and 2, described sealing ring 1 and 2 has and is parallel to the syringe inwall and the anchor ring of sealing with it, and described anchor ring is vertical with rear end face 7 with 2 front end face 6 with two sealing rings 1 respectively.

The end face of piston described in the utility model matches with the overcoat front end that matches with it, so residual space minimum behind the injection operation, for guaranteeing the sealing of this utility model central through hole structure, between die cavity 8 and end face periphery, be provided with the annular groove 8 that matches with push rod front end installation portion, and be provided with annular interior inclined-plane 10 between the bottom periphery, close place, interior inclined-plane annulate shaft is to the annular protrusion 12 that is provided with sealing, with the sealing between realization and the piston push pedal.

From Fig. 1, it can also be seen that, also be provided with on the outside piston side face with the tangent annulate shaft of the rear end face 7 of increasing back sealing ring 2 to groove 5, groove 5 forms base ring 3 with following piston portion, and the anchor ring of itself and preceding sealing ring 1 and increasing back sealing ring 2 is on same straight line, and is vertical with the piston bottom surface.

The end face 11 of disposable syringe piston described in the utility model forms the inclined-plane with constant slope with the front end face of sealing ring 6, and its diameter is less than sealing ring.

Sealing ring 1 of the present utility model and 2 guarantees contact definitely closely between piston and cylindrical shell, and also makes injector operations easy.Before and after the pressure that occurs in injector cartridge puts on influence sealing ring 1 and 2 and injector cartridge between contact pressure, and said power and main pressure will be complementary.For example, injection operation will be generally between two sealing rings 1 and 2 in leg-of-mutton angle 4 spaces and produce pressure, thereby cause one to impel front and back sealing ring 1 and 2 radially outer power, the free-ended anchor ring of sealing is pressed on the inner surface of cylindrical shell, so that guarantee tight seal.When imbibition in usually from the suction function that produces between piston bottom surface and the syringe inwall on sealing ring 2 and base ring 3, this will make the sealing ring anchor ring more effectively lean against on the inner surface of cylindrical shell, thereby also guarantee to seal closely during suction stroke.

Fig. 2 is embodiment of the present utility model, and its top is the taper top 1 of sealing, and lower lumen is a stairstepping cavity 2, is used for being connected with injection rod, is convenient to assembling.So because the sealing on its taper top 1 need not in its bottom surface just can reach tight seal as the sealing ring of Fig. 1, remove aforesaid difference, all the other structures are all identical with piston structure shown in Figure 1.The purpose of design of this piston mainly is in order to cooperate ordinary syringe use, the frictional resistance between solution and the cylinder inboard wall, problems such as leakage.

The structure of above-described syringe piston is compared with existing syringe piston, and its sensitivity is higher, Along with each position of the variation piston of cylinder internal pressure can correspondingly cooperate push rod and overcoat to seal, both protected Demonstrate,proved sealing ring and injection cylinder inner wall sealing, do not leaked, simultaneously again the reduce sealing ring because of be squeezed with The frictional resistance that produces between the injection cylinder inwall, thus should reach lower resistance, the strong purpose that seals.

The utility model compared with prior art, processing technology is simple, be easy to make, low, the sealing of cost Well, be a kind of desirable syringe piston.

Claims

1, a kind of disposable syringe piston, its main body is the cylinder of central through hole, inside is provided with the die cavity that is used to connect push rod, it is characterized in that: the outer circumference surface of piston be provided with two tilt forward and back mutual symmetric sealing ring and with the tangent annulate shaft of the rear end face of rear-inclined sealing ring to groove, the end face of piston matches with the overcoat front end that matches with it, ring central through hole end face is provided with annular groove, the annular protrusion of inclined-plane and sealing in the bottom surface is provided with.

2, disposable syringe piston as claimed in claim 1, it is characterized in that: described sealing ring is provided with perpendicular end surface.

3, disposable syringe piston as claimed in claim 1 is characterized in that: described piston-top surface and perpendicular end surface form the inclined-plane of a diameter less than sealing ring.

4, disposable syringe piston as claimed in claim 1 is characterized in that: described piston-top surface can be the taper top of sealing.

5, disposable syringe piston as claimed in claim 4 is characterized in that: the internal cavity and the push rod installation position of described taper top piston match.