CN2817873Y

CN2817873Y - Safety and self-destructive disposable syringe of steel needle springback

Info

Publication number: CN2817873Y
Application number: CN 200520064068
Authority: CN
Inventors: 罗松能
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-09-02
Filing date: 2005-09-02
Publication date: 2006-09-20
Anticipated expiration: 2015-09-02

Abstract

The utility model relates to a disposable syringe which is composed of a needle sleeve, a needle head assembly, an injection cylinder and a core rod, wherein the needle head assembly comprises an outer needle seat and a movable inner needle seat, wherein the lower part of the outer needle seat is provided with outer threads matched and connected with inner threads at the top of the injection cylinder, the lower end of the movable inner needle seat is provided with a convex ring, a spring is arranged between the inner top wall of the outer needle seat and the convex ring, and a washer is arranged between the peripheral wall of the convex ring and the inner wall at the lower end of the outer needle seat. The core rod is in a hollow cylinder-shaped structure, and the upper part of the core rod is provided with a reducing pipe section which is matched with an end plug. Because a spring-back device of a steel needle is arranged in the outer needle seat, and is assembled into the needle head assembly connected with the injection cylinder through threads, the utility model has the characteristic of the ordinary syringe with the spring-back steel needle, and has the advantages of simple production process, convenient assembly, etc. The utility model is suitable for the large-scale mechanized production of production lines.

Description

Draw point back springing type safety self-destruct disposable syringe

Technical field:

This utility model relates to a kind of disposable syringe, can make draw point recoil to the interior safety type self-destroyed syringe of injection tube after especially a kind of the use.

Background technology:

Cause the cross infection of virus for fear of using antihygienic syringe, disposable syringe is widely used at medical field.Reuse in order to stop artificial recovery, people are provided with self-desttruction equipment on disposable syringe.But,, causes common self-destruction syringe the cross infection of virus though preventing the repeated use of syringe to a certain extent, but syringe uses the back because draw point exposes and makes depleted syringe produce many inconvenience in processes such as collection, transportation, processing, still might stab medical worker and other relevant personnel, cause the infection of virus and bacteria.

A kind of safety type self-destroyed syringe is arranged in the market, this syringe is after use, draw point is recoiled in the injection tube together with needle stand, though can reach self-destruction and prevent the purpose that the draw point thorn is hurted sb.'s feelings, but described safety type self-destroyed syringe, owing to adopt built-in needle stand structure, needle stand, spring and other adnexa must be packed into from the injection tube bottom during assembling, and its fatal shortcoming is assembly technology requirement height, be difficult to realize automated production.

The utility model content:

The purpose of this utility model is to overcome the weak point of existing safety type self-destroyed syringe, provides a kind of assembly technology simple, can realize the draw point back springing type safety self-destruct disposable syringe of automated production.

This utility model, comprise needle guard, needle assembly, injection tube and be positioned at the core bar of injection tube, the top plunger cushion rubber of core bar, it is characterized by: described needle assembly comprises outer needle stand and movable interior needle stand, the inside of outer needle stand is provided with puts the circle chamber, its underpart is provided with external screw thread, and external screw thread is connected with the screw-internal thread fit at injection tube top; The upper end of needle stand is a draw point in movable, and there is bulge loop the lower end, between needle stand inner roof wall and the bulge loop, spring is set outside, the bulge loop perisporium and outside packing ring is set between the inwall of needle stand lower end; Described core bar is hollow tubular structure, and it is inner, and the bottom is provided with bottom plug in order to store the pin chamber, and top is provided with the undergauge pipeline section, undergauge pipeline section configuration end plug.

This utility model can be provided with boss below described injection tube female thread, boss matches with outer needle stand lower surface.

This utility model also can be provided with scrobicular ring by needle stand lower end outer wall outside described, scrobicular ring configuration sealing ring.

This utility model; has following advance: owing to being arranged at the draw point resilient mounting in the outer needle stand and being assembled into needle assembly; connect in the injection tube top by screw thread again; the characteristics that not only have common draw point resilience disposable syringe; also have advantages such as production technology is simple, easy to assembly, be applicable to the streamline mass mechanized production.

Description of drawings:

Fig. 1 is the structure principle chart of embodiment.

Fig. 2-Fig. 5 is the block diagram of embodiment.Wherein: Fig. 2 is a needle guard, and Fig. 3 is a needle assembly, and Fig. 4 is an injection tube, and Fig. 5 is a core bar.

Fig. 6-Figure 10 is each part drawing of needle assembly.Wherein: Fig. 6 is outer needle stand, and Fig. 7 is a sealing ring, and Fig. 8 is a spring, and Fig. 9 is movable interior needle stand, and Figure 10 is a packing ring.

Among the figure, 1, needle guard 2, needle assembly 21, movable in needle stand 211, bulge loop 22, draw point 23, packing ring 24, spring 25, outer needle stand 251, apical pore 252, put circle chamber 253, external screw thread 254, scrobicular ring 26, sealing ring 3, injection tube 31, female thread 32, boss 4, core bar 41, piston cushion rubber 42, end plug 43, bottom plug 44, storage pin chamber.

The specific embodiment:

With reference to accompanying drawing, this draw point back springing type safety self-destruct disposable syringe is made up of needle guard 1, needle assembly 2, injection tube 3 and core bar 4.Needle assembly comprises outer needle stand 25 and movable interior needle stand 21, the inside of outer needle stand is provided with puts circle chamber 252, its underpart is provided with external screw thread 253, the female thread 31 at external screw thread and injection tube top is connected, the upper end of needle stand is a draw point 22 in movable, and the lower end is provided with bulge loop 211, outside between needle stand inner roof wall and the bulge loop, spring 24 is set, the bulge loop perisporium and outside packing ring 23 is set between the inwall of needle stand lower end.The same with conventional syringe, at the top of core bar plunger cushion rubber 41, core bar is hollow tubular structure, and it is inner, and the bottom is provided with bottom plug 43 in order to store pin chamber 44, and top is provided with the undergauge pipeline section, undergauge pipeline section configuration end plug 42.

Present embodiment, also needle stand lower end outer wall is provided with scrobicular ring 254 outside, and scrobicular ring disposes sealing ring 26 and below described injection tube female thread 31, is provided with boss 32, and boss matches with outer needle stand lower surface, to improve its sealing property.

Its using method and operation principle are as follows:

When clinical use, the using method of syringe extracts medicinal liquid routinely, and also the using method of syringe is carried out injecting liquid drug routinely.When liquid medicine injection finishes back core bar continuation propelling, on the one hand, encircle piped core bar front end roof pressure packing ring 23, its displacement is entered put circle chamber 252, aspect in addition, movable in the bottom roof pressure end plug 42 of needle stand 21, make its displacement enter storage pin chamber 44, this moment, the energy storage of spring 24 discharged, and needle stand 21 in the activity and draw point thereof are sprung in the storage pin chamber 44.At this moment, syringe disintegrates and can't reuse, and the draw point of crossing with medicinal liquid and contact patients all is stored in the tube of core bar 4, reaches self-destruction, safe effect.

Claims

1, draw point back springing type safety self-destruct disposable syringe, comprise needle guard (1), needle assembly (2), injection tube (3) and be positioned at the core bar (4) of injection tube, the top plunger cushion rubber (41) of core bar, it is characterized by: described needle assembly comprises outer needle stand (25) and movable interior needle stand (21), the inside of outer needle stand is provided with puts circle chamber (252), its underpart is provided with external screw thread (253), and the female thread (31) at external screw thread and injection tube top is connected; The upper end of needle stand is draw point (22) in movable, and the lower end is provided with bulge loop (211), between needle stand inner roof wall and the bulge loop, spring (24) is set outside, the bulge loop perisporium and outside packing ring (23) is set between the inwall of needle stand lower end; Described core bar is hollow tubular structure, and it is inner, and the bottom is provided with bottom plug (43) in order to store pin chamber (44), and top is provided with the undergauge pipeline section, undergauge pipeline section configuration end plug (42).

2, draw point back springing type safety self-destruct disposable syringe according to claim 1 is characterized by: in the below of described injection tube female thread (31), be provided with boss (32), boss matches with outer needle stand lower surface.

3, draw point back springing type safety self-destruct disposable syringe according to claim 1 and 2, it is characterized by: needle stand lower end outer wall is provided with scrobicular ring (254) outside, scrobicular ring configuration sealing ring (26).