CN2801180Y - Syringe and injector therewith - Google Patents

Abstract

The utility model relates to an injection needle cylinder and a syringe with the needle cylinder. When the plastic needle cylinder is processed by an injection forming, the front end of the plastic needle cylinder is formed into a cylindrical plastic skeleton body and the inner and the outer edges of the plastic skeleton body use a secondary rubber elastic body to coat in an ejecting mode. The inner diameter hole of the rubber elastic body of an inner edge layer uses a hole, the inner diameter of which is smaller than the outer diameter of a needle head seat. When the needle head seat is inserted in a needle head socket, the rubber elastic body with large elastic deformation space of the inner layer causes the needle head seat and the needle head socket at the front end of the needle cylinder to form tight combination efficacy. The utility model has industrial utilization and progress.

Description

A kind of syringe cylinder and use the syringe of this syringe

Technical field

This utility model relates to a kind of improvement of syringe cylinder, refers to that especially a kind of syringe needle socket that can effectively promote the syringe front end combines the means of precision with needle holder, belong to the medical syringe technical field.

Background technology

Press, known safety injector structure, its main demand be make syringe needle can in the injection after, syringe needle can be retracted injection tube inside, impose structural deterioration again, to prevent repeated use, and when abandoning or safe effect, apply for " little dosage safety syringe cylinder " No. 84212845 as Taiwan, " formula that conveniently the abandons safety syringe-drum of tool prevention infection " applied in Taiwan No. 84207022, " the improvement structure of high-safety injection tube " applied in Taiwan No. 84217653, or Taiwan applies for being the novel patent of above-mentioned typical safety injector shown in No. 87209311 " improved structure of high-safety injection tube " etc.

The common feature of relevant known injection safety syringe technology such as above-mentioned, be to comprise a syringe, one push rod, the high-safety injection tube that one needle holder and a syringe needle are formed, needle holder is planted in syringe front end syringe needle socket, and come off arbitrarily to prevent needle holder in the mode of closely cooperating, only make push rod can destroy the also technology of retracting needle seat, then select and after this needle holder, be provided with the bigger containing hole of a diameter in the stomidium, and establish a cervical region in the nose end edge, the front end of push rod then is provided with a conical hook medicated cap, so, can be after the operator utilizes push rod with the liquid medicine injection, go in the containing hole of needle holder simultaneously, and live cervical region and then the interlock syringe needle retracts needle holder in the syringe in the lump by the hook cap hook with this hook medicated cap contract.

Above-mentioned known push rod retracts the design of needle holder, because of the also feasible quite difficulty of making of the relation of the precision that matches, in detail, for making push rod can laborsavingly retract needle holder, its needle holder is to reduce with the compactness that combines of syringe, though so can be resistance force diminishes, but often because so and in syringe needle inserts human body the time, cause needle holder to be shunk back because of resistance is excessive falling into the effect of losing injection in the syringe, even, under low situation in conjunction with compactness, when push rod is pushed liquid medicine in the syringe forward, the pressure that push rod forms promptly causes liquid medicine to be oozed out by needle holder and syringe socket junction, and is serious, also may cause needle holder to break away from the situation of syringe.

Otherwise, bonding tightness between the syringe needle socket of needle holder and syringe front end is too high, and in the time of then can causing push rod to pull back again, push rod hook medicated cap then can break away from the containing hole of needle holder, and needle holder can't be colluded from the syringe needle socket, nature can't reach the purpose of design of pulling back safely.

Therefore, belong to the needle holder of rigid plastics material together, syringe needle socket bonding tightness with the syringe front end, desire to control to just right state, industrial circle can only all adopt the mould ejection formation of high precision to solve the above problems with syringe and needle holder at present, but the die sinking cost of high-precision mold is too high, so that the cost of syringe can't significantly reduce, and, belong to the syringe and the needle holder of plastics material together, syringe and needle holder through different mould ejection formations, also be to cause to reach one of shortcoming of estimating precision between the two in conjunction with precision, even the long-time mould of ejection formation under the condition of high temperature repeatedly also may cause mould to produce micro-deformation problems, this miniature deformation is for the syringe needle socket that high precision requires, but be another key factor that causes above-mentioned all shortcoming, generally speaking known syringe cylinder structure remains industry to propose advanced effective solution really.

The utility model content

Syringe cylinder of the present utility model and use the syringe of this syringe, mainly be syringe and the needle holder that belongs to the plastics material together at known, adopt high-precision mold molding syringe and needle holder, the high-precision mold that causes is offered the too high shortcoming of cost, for reaching high in conjunction with precision and have the creation spirit of low processing cost expenditure concurrently, this utility model is during with the plastic needle cylinder ejection formation, front end molds a columned plastic skeleton body in the lump, then the plastic skeleton volume surrounding is imposed secondary rubber elastomer and penetrate coating, and the rubber elastomer inner diameter hole is shaped to be slightly less than the external diameter of needle holder, when being beneficial in the needle holder insertion syringe needle socket, can pass through the bigger rubber elastomer of internal layer elastic deformation amount, reach the preferable effectiveness of combining closely.

The detailed technology means that the said structure effect reaches, please cooperate graphic and embodiment explanation as after.

Description of drawings

Fig. 1 is the outward appearance partial cutaway schematic of syringe of the present utility model.

Fig. 2 is a syringe local appearance generalized section of the present utility model.

Fig. 3 is the local appearance sketch map of syringe of the present utility model and skeleton body.

Fig. 4 is syringe and the skeleton body local appearance sketch map of this utility model the 2nd embodiment.

Fig. 5 is syringe of the present utility model and syringe needle socket local appearance perspective view.

Fig. 6 is the generalized section of Fig. 5.

Fig. 7 is syringe and the syringe needle socket local appearance perspective view of this utility model the 2nd embodiment.

Fig. 8 is the generalized section of Fig. 7.

[primary clustering symbol description]

1------syringe 10-----syringe

11-----syringe needle socket 12-----push-and-pull portion

13-----accommodation space 14-----push rod

141----pushed section 142----supports portion

15-----needle head structure 151----needle holder

152----needle body 153----locating slot

16-----skeleton body 161----projection

162----ring 17-----elastomer

The 171----ring is protruding

The specific embodiment

This utility model is relevant a kind of syringe cylinder and the syringe that uses this syringe, please refer to shown in Fig. 1,2, and this syringe (1) comprising:

One syringe (10), it is the cylindrical shell of a hollow, the syringe of this hollow form (10) front end is extended with a syringe needle socket (11) than path, and syringe (10) is terminal then to be extended with a push-and-pull portion (12) that enlarges shape, and is inner then be formed with the accommodation space (13) of a penetration state;

One push rod (14) is set in the accommodation space (13) of syringe (10), and straight line slippage in accommodation space (13), and its front end shape has the pushed section (141) of a nahlock aspect, and the rear end then is formed with a portion (142) that supports greater than accommodation space;

One needle head structure (15) includes the round pin headstock (151) of a strip and is plugged in the interior elongated needle body of hollow (152) of needle holder (151), when needle holder (151) is inserted syringe needle socket (11), ring protruding 1 proper and syringe needle socket (11) internal face forms a firm embossed card and supports marriage relation, and the default place of needle holder (151) one ends is formed with the locating slot (153) of an inner concavity;

And the main improvement of this utility model is (with reference to Fig. 3,5,6): syringe (10) front end extend than path syringe needle socket (11), this syringe needle socket (11) generation type, be when plastic needle cylinder (10) molding, the front end one is extended a plastic skeleton body (16), this plastic skeleton body (16) as shown in Figure 3, establish for the circular projection of plural number (161) spacer ring and to form (the single hollow annulated column aspect that also can adopt preset thickness), each projection (161) top also forms the ring (162) that links each projection, uses the structural strength of strengthening skeleton body (16);

The skin (be meant inner edge and the outer rim position of skeleton body) of back in plastic skeleton body (16) is installed with the elastomer (17) that the plastic rubber material of a tool is made, the combination of elastomer (17) and skeleton body (16), can adopt the coating mode that penetrates, or penetrate the hollow rubber body of the interior outer rim of corresponding skeleton body (16) in advance, be slidingly connected respectively again, no matter rubber elastomer (17) adopts skeleton body directly to insert mould, the secondary that imposes the rubber material penetrates the coating means, or open a mould in advance and penetrate hollow rubber cover volume morphing, it is by the unique bigger characteristic of distortion elastic space of rubber material itself, be beneficial to the mould of this utility model rubber elastomer, only need open the mould of the general precision of lower cost, can reach needle holder and syringe needle socket in conjunction with the time contract in being difficult for, the high accuracy that the comes off effect of combining closely, simultaneously, have concurrently with after pulled back to syringe by push rod easily, can't reusable safety injector to form one.

In addition, the outer field elastomer of above-mentioned skeleton body (16) (17), the inwall aperture of its inner rim is adopted and is slightly less than needle holder (151) external diameter, and the inwall of elastomer (17) inner edge is formed with a ring protruding (171) inwardly, when being beneficial to needle holder (151) insertion syringe needle socket (11), needle holder (151) can be encircled protruding (171) embossed card by this and support, and forms a firm bonding state.

This utility model is different from known syringe needle socket and needle holder all adopts the design of rigid plastics material, and adopt the plastic skeleton body (16) of hard key for supporting, and in skeleton body skin (interior outer rim) molding one preferable strain spatial rubber material elastomer (17), has preferable strain space advantage by rubber itself, be aided with inner diameter hole again and be slightly less than needle holder (151) design, after can making needle holder (151) insert syringe needle socket fixed point, the elastomer of rubber material (17) then can produce elastic recovery packing power to needle holder (151), and this utility model adopts the preferable rubber elastomer folder of strain to compel the needle holder design:

At first, the preferable advantage in strain space of rubber material can reach high accuracy between needle holder and the syringe needle socket effect of combining closely really, contracts in the needle holder or deviates from and be difficult for producing;

Moreover, when the needle holder drawn stem that compeled by rubber elastomer folder is pulled back, only need impose suitable power and can reach and pull back to syringe, can not cause the situation of the effort of pulling back at all;

The 3rd, syringe needle socket inner edge elastomer adopts the design of rubber material, then can utilize common mould ejection formation, can reach with the needle holder high precision to combine effect, for economic aspect, this utility model meets the supremacy clause of economic interests rule and market competition really.

As for, the skeleton body of syringe needle socket (16) adopts the plastics material, mainly be to consider that the syringe needle socket adopts rubber material mode entirely, one comes rubber needle socket and plastic needle cylinder to be subject to the material properties shortcoming, and can't reach splendid associativity, and two structure position penetrate with the different attribute material respectively, its junction there is no any syndeton reinforcement, the shortcoming that its bond strength deficiency is very important especially, therefore, this utility model extends out the skeleton body (16) of projection shape especially in the lump when the syringe molding, be beneficial to follow-up caoutchouc elasticity physical ability and the firm combination of plastic cement skeleton body, and in order to reach more effective combination stability effect, circular projection (161) surface of skeleton body (16) is equipped with groove or relief flank, to increase the coefficient of friction between skeleton body and elastomer, to reach the tightr interlock effect between two materials.

Again, the said structure argumentation is the syringe based on 3～5cc, if when adopting the syringe of 1cc injection volume, since syringe needle socket and needle holder drag area between the two significantly reduce (because of the syringe circumferential area of 1cc less, so the friction area after both engage also diminishes relatively), push the pressurization power that is produced forward when push rod, major part is concentrated in the bottom surface of needle holder, needle holder resistance under the drag area reduced state must be less than the extruding power of push rod when the time comes, the syringe needle toilet can produce break away from the syringe needle socket can't use shortcoming, the generation of this situation is of common occurrence especially.

Yet this utility model migrates above-mentioned technology to Fig. 4 and Fig. 7, during the syringe of the 1cc injection volume shown in 8, though the drag area between syringe needle socket (11) and needle holder (151) is dwindled, but can be by the rubber elastomer (17) of syringe needle socket inner edge layer, its rubber material itself has the preferable characteristic in strain space, compel positioning function with the elastic reset folder that reaches after needle holder is inserted, being aided with the ring protruding (171) of elastomer internal face and locating slot (153) embossed card of needle holder again supports, really can remedy syringe needle socket drag area reduction problem, and then provide the effect of needle holder strong fix in the syringe needle socket, this is by as seen, this utility model adopts and moulds, the two material technological means of rubber material are formed with splendid comprehensive suitability effect for the syringe of big or small injection volume.

Claims (10)

1, a kind of syringe cylinder is characterized in that, wherein this syringe can supply a ccontaining push rod, and the front end one of this syringe is extended with the skeleton body of a syringe needle socket, and the skin of this skeleton body is installed with a plastic elastomer, uses to constitute a complete syringe needle socket.

2, syringe cylinder according to claim 1 is characterized in that, this plastic elastomer is the rubber material.

3, syringe cylinder according to claim 2 is characterized in that, this skeleton body is by the annular circular projection in a plurality of intervals.

4, syringe cylinder according to claim 2 is characterized in that, skeleton body outer layer rubber elastomer adopts the shoot mode molding.

5, syringe cylinder according to claim 2 is characterized in that, be shaped the in advance hollow sleeve of outer rim form in the corresponding skeleton body of rubber elastomer is set in outer rim in the skeleton body again.

6, a kind of syringe is characterized in that, mainly comprises:

One syringe is a hollow cylinder, and front end is formed with a syringe needle socket, the skeleton body that this syringe needle socket is extended by syringe front end one, and be installed in the outer field plasticity elastomer of skeleton body and constitute, back end of syringe then is formed with a push-and-pull portion;

One push rod is installed with in the syringe of hollow, and the push rod front end is formed with one and supports portion, and the rear end then is formed with a pushed section;

One needle head structure includes a needle holder and a needle body, and this needle holder is plugged in the syringe needle socket of syringe, then is inserted with a needle body in the needle holder.

7, syringe according to claim 6 is characterized in that, this plastic elastomer is the rubber material.

8, syringe according to claim 7 is characterized in that, this skeleton body is by the annular circular projection in a plurality of intervals.

9, syringe according to claim 7 is characterized in that, skeleton body outer layer rubber elastomer adopts the shoot mode molding.

10, syringe according to claim 7 is characterized in that, be shaped the in advance hollow sleeve of outer rim form in the corresponding skeleton body of rubber elastomer is set in outer rim in the skeleton body again.

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