CN2459024Y - Disposable syringe - Google Patents

Abstract

The utility model discloses a disposable syringe. The utility model comprises a needle cylinder and a push rod. The head of the push rod is movably fixed with a piston. The inner circle end surface within scale lines of the needle cylinder is provided with at least one shoulder bulge of an inner bulge along the inner circumferential direction. The outer circle end surface of the piston is provided with a groove. The fit of the push rod and the piston is separated because the bottom end surface of the piston is blocked by the shoulder bulge. After the injection is completed, the piston is left inside the needle cylinder. The reuse can be avoided, and the purpose of disposable use can be achieved.

Description

Disposable syringe

This utility model relates to disposable syringe.

Disposable syringe has the advantage of the cross infection of preventing, is widely used in medicine and hygiene fields at present.The kind of existing disposable syringe is a lot, and a kind of disposable syringe is wherein arranged, and it is a dangerouse cross-section of establishing an indent on push rod, after having injected, pulls out push rod, destroys syringe thereby push rod fractureed from its dangerouse cross-section.This syringe also needs manually-operated to destroy, and is not very convenient; If because of operator neglect the push rod that do not fracture, syringe might be repeated to use.

The purpose of this utility model is to provide a kind of more convenient disposable syringe of operating.For achieving the above object, this utility model is by the following technical solutions:

Disposable syringe comprises syringe and push rod, is fixed with a piston at the head movement of push rod, and it is prominent at least to be provided with one in prominent shoulder with interior interior nose circle face along the inner periphery direction at needle cylinder scale line, and the cylindrical end face of described piston offers groove.After piston was shifted the end onto, interior prominent shoulder is prominent just can be hindered piston and extracts from syringe, because piston and push rod are clearance fit, thus can only extract push rod, and piston can not be extracted, thereby piston is stayed in the syringe, reach disposable purpose.

Above-mentioned disposable syringe is established a tight chock plug at the head of push rod, establishes a tight consent at the tight chock plug place of the corresponding push rod of piston, and the tight chock plug of push rod inserts in the tight consent of piston.This structure can realize the clearance fit of piston and push rod easily, and after the realization piston was obstructed, piston separated with push rod.

Above-mentioned disposable syringe, described piston are elastomer.Piston is an elastomer, can make the piston easy deformation, and is smoothly prominent by takeing on, and realize and the separating of push rod.

Above-mentioned disposable syringe, described shoulder is prominent, and its cross sectional shape is barb-shaped.The bottom face of piston can be hooked like this, piston is applied resistance, the realization piston separates with push rod.

Above-mentioned disposable syringe, described tight chock plug, it is shaped as hemispherical.

Owing to adopted such scheme, this utility model operation is gone up more convenient: finish using, as long as pull out push rod, piston will be stayed in the pipe because of being subjected to the prominent obstruction of syringe inwall shoulder, even operator's carelessness, this syringe can not be used again.

Below in conjunction with accompanying drawing, the utility model will be further described:

Fig. 1 is this utility model structural representation;

Fig. 2 uses sketch map for this utility model;

Fig. 3 is this utility model piston and pusher structure sketch map;

With reference to accompanying drawing, number in the figure and parts are syringe 1, push rod 2, and piston 3, shoulder dashes forward 4, tight chock plug 5, tight consent 6, groove 7.

Embodiment 1:

With reference to accompanying drawing, along the circumferential direction to establish a shoulder at syringe 1 graduation mark with interior interior nose circle face and dash forward 4, shoulder prominent 4 refers to the inside projection of syringe 1 inwall, and its cross sectional shape is barb-shaped.

Because of this syringe of difference of injection capacity is established a plurality of specifications, so shoulder prominent 4 should be located at and be positioned in syringe 1 maximum injection gauge wire and the injection port, otherwise piston can be extracted beyond the injection scope, certainly just can reuse disposable use of being far from being.Fig. 1 is located at the sketch map of syringe 1 maximum injection gauge wire front end for shoulder prominent 4.Certainly, the prominent middle part or the rear portion that also can be located at syringe maximum injection gauge wire of shoulder, but it is comparatively quite a lot of obviously to be located at front end.

With reference to accompanying drawing, push rod 2, syringe 1 are made up of other hard materials such as plastics, and piston 3 is made up of elastomeric material, the front end of push rod 2 is provided with tight chock plug 5, tight chock plug 5 is inserted in the tight consent 6 of piston 3 in use earlier, and push rod 2 is separable with piston 3, and tight chock plug is a resilient engagement with tight consent.Before the injection, piston 3 should be positioned at the rear end of shoulder prominent 4, and will guarantee that piston 3 can suck the medicinal liquid of capacity.After sucking medicinal liquid, piston 3 is pushed away forward, injection is finished, because shoulder prominent 4 props up the bottom face of piston 3, hinder piston 3 and draw back, and the tight chock plug 5 of push rod 2 and the tight consent 6 of piston 3 are resilient engagement that it is little that the connection power of the two is takeed on prominent 4 resistances that produce, if so retract push rod 2, piston 3 will separate with push rod 2; Even operator do not retract push rod 2, as desire to reuse, when sucking medicinal liquid, also draw back, realized the purpose of disposable syringe because of this obstruction makes push rod 2 can not drive piston 3.

With reference to accompanying drawing, the tight chock plug 5 of push rod 2 described in the utility model, it is shaped as hemispherical.

Claims (5)

1, disposable syringe, comprise syringe and push rod, it is characterized in that being fixed with a piston at the head movement of push rod, it is prominent at least to be provided with one in prominent shoulder with interior interior nose circle face along the inner periphery direction at needle cylinder scale line, and the cylindrical end face of described piston offers groove.

2, disposable syringe as claimed in claim 1 is characterized in that establishing a tight chock plug at the head of push rod, establishes a tight consent at the tight chock plug place of the corresponding push rod of piston, and the tight chock plug of push rod inserts in the tight consent of piston.

3, disposable syringe as claimed in claim 1 is characterized in that described piston is an elastomer.

4, disposable syringe as claimed in claim 1 is characterized in that described shoulder is prominent, and its cross sectional shape is barb-shaped.

5, disposable syringe as claimed in claim 1 is characterized in that described tight chock plug, and it is shaped as hemispherical.

Images