CN2801181Y - Piston rod of injector, and injector therewith - Google Patents

Abstract

The utility model discloses a push rod of a syringe and a syringe with the push rod. The utility model is mainly characterized in that the front end of the push rod of the syringe is directly formed into an axial shaft member, and a plurality of skeleton bodies in a convex post shape are formed around the shaft member; the convex posts and the outer edge of the partial shaft member are coated by plastic elastic bodies of rubber materials through an ejecting processing means, and one rubber extruding part having good coating performance and good fastening performance is formed. Because the convex posts and the shaft member use the horizontal design of axial direction, the complicated structure degree of a push rod mold can be effectively reduced and the manufacturing cost of the syringe conforms to economic benefit. When the rubber and the plastics are recovered, the forced separation can be carried out and the recovery rate can be improved.

Description

Injector push-rod and use the syringe of this push rod

Technical field

This utility model relates to a kind of syringe, refers to a kind of push rod of syringe especially, belongs to medical syringe technical development field.

Background technology

In the streets mini clinic or large-scale medical institutes at present, administering mode for sufferer, except open medicated powder, medicine heavy stone used as an anchor, medicament is taken orally or external application, the most effective intramuscular injection or intravenous injection no more than medicinal liquid, but, medicinal liquid is desired to inject in the human epidermal smoothly, then need rely on the syringe of syringe needle.

Known syringe is made up of a syringe, a push rod and a syringe needle, and syringe needle inserts the human muscle or when subcutaneous, then sees through push rod and passes forward the medicinal liquid in the syringe by the syringe needle injection human body that portals, and promptly finishes one injecting liquid drug formality.

Yet, the medicinal liquid of desiring to reach in the syringe pushes syringe needle fully, but industry is convenient to the rubber piston that the push rod front end is set up a plastoelastic deformation, be incorporated into the push rod front end by penetrating the coating mode, be beneficial to push rod forward the process of passing can utilize the rubber piston pressurized can slightly be out of shape speciality, push the syringe needle purpose fully with the medicinal liquid that reaches in the syringe.

Common injector push-rod structure is to utilize a rubber sleeve to snap into the push rod front end, yet this kind secondary operations mode, for promoting production efficiency, be difficult to have breakthrough again, therefore there is a kind of structure of time processing to propose in addition by industry, with reference to Fig. 5, be that TW applies for " push rod of syringe " the 9221330 No. two, it mainly is the axis bar with the one-body molded rigid plastics material of push rod body front end, and horizontal locating part and connector perpendicular to axis bar, but the rubber ejaculation with plastoelastic deformation is coated between connecting piece and part axis bar, to be combined into a rubber piston then.

The rubber piston that the coating mode is shaped is penetrated in above-mentioned utilization, though can reach quick, the yield advantages of higher of its assembling, yet a product desires to be subjected to deeply consumer preference, except quality is considered, maximum inducement is still selling price, especially syringe belongs to the medical institutes consumable goods of every day, not big not the saying naturally of usage quantity and instructing, so the selling cost of syringe is the major consideration of the medical institutes of influence when stocking up; Environmental protection factor when it reclaims again also is the emphasis of its consideration.

Thereby, see it by above-mentioned known injector push-rod overall structure, originally desire is by the axial axis rod member, collocation transverse connection square crossing design, tightness when coating in order to the reinforcing rubber piston, however the square crossing design adopted because of connector and axis bar also, produce the certain difficulty degree when causing push rod to offer mould, and then mould opens cost and marries again price to syringe, causes the competitiveness on the price to descend; And hold as above-mentioned institute and say, because this connector adopts vertical the setting, because being rubber one, this material one is plastics again, so the recovery classification after its sterilization, because of it adopts vertically disposed structure, this rubber material can't come off on plastics smoothly, can make it separate and need to destroy this rubber with plastics, this point then causes defective on its subsequent treatment again, takes a broad view of above-mentioned known syringe setting, the place that truly has it to remain to be improved.

The utility model content

Take shape in the push rod front end for solving above-mentioned piston, because of axis bar and connecting piece employing square crossing design, cause mould to offer the deutero-cost of degree of difficulty and directly marry again shortcoming to the syringe price and the puzzlement in the recycling, this utility model goes out the push rod front end straight forming of syringe the axial axis rod member of one rigid plastics, the also skeleton body of several identical materials of molding in the lump around the axis bar, but be coated on projection and part axis bar by penetrating the rubber material that manufacturing process will plastoelastic deformation again, to constitute the preferable rubber extruded portion of a coating tightness.

This utility model adopts axial level design by above-mentioned projection and axis bar, can significantly reduce the mould structure design complexity of push rod, and then reach the reduction of syringe selling cost, be that a progressive new structure that meets the economic competition rule is created really.

Just use the classification of back to handle, be to utilize and the homoaxial projection setting of axostylus axostyle then because of this utility model, so can be via directly forcing to separate this rubber and plastics after the application of force, it is separable to destroy this rubber square with respect to known configurations, and this utility model obviously can reach the preferred process mode.

And this utility model reaches the used detailed technology means of said structure effect, cooperates the specific embodiment contained as the back below in the lump, can further understand this utility model progressive effect.

Description of drawings

Fig. 1 is the STRUCTURE DECOMPOSITION sketch map of syringe of the present utility model.

Fig. 2 is the structure outward appearance generalized section of syringe of the present utility model.

Fig. 3 is the local appearance sketch map that the push rod front end of syringe of the present utility model extends skeleton body.

Fig. 4 is the local appearance sketch map of push rod front end molding one press section of syringe of the present utility model.

Fig. 5 is the vertically disposed clad structure sketch map of known syringe.

[primary clustering symbol description]

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

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

13-----containing hole 20-----push rod

21-----press section 22-----press section

30-----syringe needle 31-----needle holder

32-----needle body 33-----storage tank

The plastic elastomer of 221----skeleton body 222----

223----axostylus axostyle body 224----projection

322----injection orifice 2231---hook part

The specific embodiment:

This utility model is relevant a kind of " injector push-rod and use the syringe of this push rod ", please cooperate with reference to shown in Fig. 1,2, and this syringe (1) mainly comprises:

One syringe (10), it is the cylindrical shell of a hollow, the syringe of this hollow cylinder (10) front end is formed with a syringe needle socket (11), terminal then the push-and-pull portion (12) that enlarges shape that extends outwardly out, and syringe (10) inside is formed with the containing hole (13) of a penetration state, for the usefulness of a push rod (20) by this opening insertion;

The push rod of one rigid plastics material (20), insert syringe (10) by syringe (10) opening direction, and can linear reciprocation slippage in the inner containing hole of syringe (13), the body rear end of this push rod and be formed with one be slightly larger than push rod and containing hole pull shape press section (21), front end then is extended with a press section (22), and it is one airtight against state that press section (22) and the inner containing hole of syringe (10) (13) aperture are; One syringe needle (30) comprises a needle holder (31) and a needle body (32), and this needle holder (31) is a circular block, and the hub head end is coated with the syringe needle (32) of a tool injection orifice (322), and the rear end, axle center then is formed with a storage tank (33);

This utility model is mainly improved the press section (22) that is push rod (20) front end, please cooperate with reference to Fig. 3, shown in 4, this press section (22) is made of a skeleton body (221) and a plastic elastomer (222), the marriage relation of this skeleton body (221) and plastic elastomer (222), front end axle center one is extended the axis bar (223) of front end tool hook part (2231) when being push rod (20) molding, and, the also axial on every side one of axis bar (223) is extended the circular projection (224) of right quantity, then, utilize shoot mode that the plastic elastomer of rubber material is coated projection (224) and part axis bar (223) outer rim, make the hook part (2231) of axis bar (223) front end be outer dewiness, promptly mold a complete press section (22).

The skeleton body (221) that coats for plastic elastomer (222) in this utility model press section (22), owing to adopt the coaxial form design of respective shaft rod member (223), really reached and simplified push rod (20) complex structure purpose, the degree of difficulty of offering for push rod (20) mould more has substantial attenuating effectiveness, being beneficial to known push rod mould offers the expensive problem of cost and can obtain effective improvement, simultaneously, when reclaiming time-like, it can easily this rubber material be separated with plastics, reach the purpose of classification, projection (224) skeleton body (221) that extends by the axial one of push rod (20) front end of this utility model again, and also can obtain good effect in conjunction with tightness between plastic elastomer (222).

Certainly, for strengthening the tightness that combines between skeleton body (221) and plastic elastomer (222), also can be equipped with the rib of ring groove or relief in the appearance edge of axial axis bar (223) or projection (224) (but also axis bar and projection), to increase the interlock tightness of plastic elastomer (222) and skeleton body (221), in case throw-out lever is in syringe during the linear reciprocation start, the situation that causes plastic elastomer (222) to break away from.

Moreover, the plastic elastomer (222) that this utility model press section (22) outer rim coats, be directly penetrate by rubber Overmolded, its can be under quite quick, smooth and easy state and skeleton body (221) be a fastening cover junction relationship.

Claims (6)

1, a kind of injector push-rod is characterized in that, the push rod body rear end of rigid plastics material is formed with a press section, and front end is formed with a press section, and this press section comprises:

One axis bar prolongs the one extension of push rod axle center and forms, and front end also is formed with a hook part;

One skeleton body is formed by the axial one extension of push rod front end;

One plastic elastomer adopts the rubber material to make, and this plastic elastomer one penetrates and coats this skeleton body and part axis bar.

2, injector push-rod according to claim 1 is characterized in that, skeleton body is circular projection.

3, injector push-rod according to claim 2 is characterized in that, projection appearance edge is equipped with ring groove or relief rib.

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

One syringe, front end are formed with the syringe needle socket, and the rear end is formed with a push-and-pull portion, and inside then is penetrated with a containing hole;

One push rod, but be plugged in the syringe with the activity of straight line slip mode, its rear end is formed with the press section, front end then is extended with a press section, the skeleton body of this press section inner edge, formed by the axial one extension of push rod front end, the axis bar that skeleton body and push rod axle center one are extended is axial corresponding relation, and the plastic elastomer of rubber material of press section then is combined in the outer rim of skeleton body and part axis bar;

One syringe needle includes a needle holder and a needle body, and the syringe needle socket of this syringe needle by needle holder and syringe is one and plugs relation.

5, syringe according to claim 4 is characterized in that, the axis bar front end is not subjected to coating place of plastic elastomer to be formed with a hook part.

6, syringe according to claim 4 is characterized in that, the needle holder axle center is formed with a storage tank.

Images