CN201179256Y

CN201179256Y - Core-rod structure for safety self-destructing injection syringe

Info

Publication number: CN201179256Y
Application number: CNU2008200558520U
Authority: CN
Inventors: 李美莉
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-02-29
Filing date: 2008-02-29
Publication date: 2009-01-14
Anticipated expiration: 2018-02-28

Abstract

The utility model discloses a core rod structure which is used for a safe self-destruction type injector. The core rod structure is characterized in that a back pull cylinder is provided with a long opening which is parallel to the back pull cylinder, an inclined surface is arranged on the external wall of the back pull cylinder, the part where the inclined surface is near the end part of the back pull cylinder is lower, the part where the inclined surface is near a rubber plug part is higher, and the high part of the inclined surface and the external wall of the back pull cylinder form a sidestep. The core rod structure has simple and practical structure, simple module opening process and low manufacture cost, can be produced in an industrialized and a large batch way, can realize full automatic injector assembly, has good practicality, stable work state and very good market foreground.

Description

A kind of core bar structure that is used for safety self-destructing syringe

Technical field:

This utility model relates to technical field of medical, a kind of specifically core bar structure that is used for safety self-destructing syringe, particularly its mechanical connecting structure.

Background technology:

Documents one, patentee: Hengwang International Co., Ltd., the patent No.: ZL02241525.4, patent announcement number: CN2560363, a kind of " syringe needle of haulback safety syringe and syringe coupling apparatus " disclosed in this case, its disclosed content is a syringe needle, one syringe and a plunger, this syringe needle is to be inserted in the syringe by the opening of back end of syringe, this syringe needle has a needle body and a needle stand that supplies needle body to plug, this syringe is a hollow cylinder, its front end forms the syringe needle socket, inserts combination for syringe needle by the place ahead, and this hub outer surface is provided with at least one circle projection; And the inner wall surface of syringe top syringe needle socket part is provided with and the corresponding at least one circle groove of hub outer surface projection.

Documents two, patentee: Luo Bizhang, the patent No.: ZL03206925.1, patent announcement number: CN2662919Y, a kind of " the push rod hook part structure of safety injector " disclosed in this case, the push rod hook part structure that its disclosed content is a kind of safety injector, it is characterized in that: the hook part of the push rod front end of described syringe is provided with a protuberance, described protuberance system protuberance before the mediad of hook part extends, and corresponding to the inner space of needle holder, described protuberance is a cylinder, and exceeds corresponding to the span of needle holder inner space.

Documents three, patentee: Luo Zhengyi, the patent No.: ZL20042003043.7, patent announcement number: CN2675147Y, a kind of " fastening structure of self-destruction type and safety syringe " disclosed in this case, its disclosed content is the fastening structure of a kind of self-destruction type and safety syringe, may be implemented in the fastening structure of push rod of self-destruction type and safety syringe, it is characterized in that: be provided with one in the button portion scope and compel to squeeze the spatial Chang Gou of distortion nargin hole when making as buckleing longitudinally with clasp, described long groove is vertical setting, and be located between the scope of cylinder and button portion, cannot not be open shape, described glue head is provided with a through hole that is embedded into for the pipe close body, and described button portion becomes taper and has oblique surface.

In sum, from syringe construction, structurally still there are the defective that can't overcome in existing needle holder haulback safety syringe and safety self-destructing syringe, propulsive force required when for example the core bar end pushes the needle holder inner chamber requires bigger, the clinical requirement medical personnel need singlehanded complete operation when injection, if required propulsive force is bigger, or smooth phenomenon appears when advancing, the stability of syringe when influence is injected easily, so still need the core bar structure of existing syringe needle haulback safety syringe or syringe needle haulback type safety self-destructing syringe is further improved, make its required propulsive force in operation littler, advance more smoothly, and don't can have influence on gmatjpdumamics between core bar end and the needle holder.

Summary of the invention:

The purpose of this utility model is to provide a kind of core bar structure that is used for safety self-destructing syringe, it is suitable for the syringe needle haulback type safe self-breaking syringe of various dosage, propulsive force required when the cylinder of will pulling back pushes the needle holder inner chamber is less, and in case after entering the needle holder inner chamber, the pull-back forces that the cylinder of pulling back can bear is enough to overcome the frictional resistance of needle holder outer wall, stably needle holder is drawn in syringe simplified in, overcome the shortcoming and defect that prior art exists.

To achieve these goals, technical scheme of the present invention is: a kind of core bar structure that is used for safety self-destructing syringe, it mainly comprises the body of rod, body of rod end is provided with the cylinder of pulling back, pull back and be socketed with plug between the cylinder and the body of rod, it is characterized in that: the described cylinder place that pulls back offers long opening, long opening is parallel to the cylinder of pulling back and offers, the cylinder outer wall place that pulls back is provided with slope, slope is lower near the place, cylinder end that pulls back, slope is higher near plug portion, and the slope eminence forms step with the cylinder outer wall of pulling back.

The utility model discloses a kind of core bar structure that is used for safety self-destructing syringe, its design concept that breaks traditions fully, adopt the squash type column structure of pulling back, utilization is opened in the long opening at the cylinder place that pulls back, the outer wall of the feasible cylinder of pulling back has the elasticity of inside extruding, when the slope that is arranged on the cylinder outer wall of pulling back touches needle holder inner chamber lower edge, under the effect of slope, pulling back the outer wall of cylinder can stressed inside crimp, can take advantage of a situation with the cylinder ramp of returning of guaranteeing to be wider than the needle holder intracavity diameter and to enter the needle holder inner chamber, after the whole cylinder ramp of pulling back enters into the needle holder inner chamber, the cylinder outer wall of pulling back can put on bounce the inwall of needle holder inner chamber, the frictional force that is produced between them (gmatjpdumamics) is greater than the frictional force of needle holder outer wall and syringe cylinder neck inside, so only need slightly to after-applied certain pulling force, just needle holder can be pulled back, and with needle holder be pulled into syringe simplified in, realized the safety self-destruct of syringe, this product structure is simple and practical, die sinking technology is simple, low cost of manufacture, but industrialized mass, and can realize full-automatic syringe assembling, product has good practicability, stable working state has good market prospect.

Description of drawings:

Fig. 1 is this utility model structural representation

Fig. 2 is this utility model first example structure sketch map

Fig. 3 is this utility model second example structure sketch map

Fig. 4 is this utility model the 3rd example structure sketch map

Fig. 5 is this utility model the 4th example structure sketch map

Fig. 6 is this utility model the 5th example structure sketch map

Fig. 7 is this utility model the 6th example structure sketch map

The specific embodiment:

With reference to the accompanying drawings, this utility model further is described

This utility model is a kind of core bar structure that is used for safety self-destructing syringe, it mainly wraps the body of rod 1, the body of rod 1 end is provided with the cylinder 2 of pulling back, pull back and be socketed with plug 3 between the cylinder 2 and the body of rod 1, it is characterized in that: described cylinder 2 places that pull back offer long opening 4, long opening 4 is parallel to the cylinder 2 of pulling back and offers, the cylinder 2 outer wall places that pull back are provided with slope 5, slope 5 is lower near the place, cylinder 2 ends that pulls back, slope 5 is higher near 3 ones of plugs, and slope 5 eminences form step 6 with cylinder 2 outer walls of pulling back.Described in this utility model specific embodiment, cylinder 2 places that pull back are provided with oblique breach 7, oblique breach 7 is spent for 2 one-tenth 1 to 179 degree with respect to the cylinder of pulling back and is provided with, and that described long opening 4 can be is rectangular-shaped, oval row shape, trapezoidal shape, triangle, in specific embodiment, the height of described step can be 0.1mm～5mm, for the ease of the cylinder 2 smooth and easy needle holder inner chambers that enter of pulling back, described cylinder 2 ends of pulling back are circular-arc, in the specific implementation, the diameter of the described cylinder of pulling back (2) is 0.4mm～7mm.

When this utility model is specifically implemented, slowly promote stem forward, when the slope that is arranged on the cylinder outer wall of pulling back touches needle holder inner chamber lower edge, can be subjected to certain resistance herein, but because aslope herein, enter the needle holder inner chamber so be easy to just can take advantage of a situation, but resistance suffered in past more is also big more, cylinder offers long opening owing to pull back, so the cylinder outer wall of locating of pulling back is thinner, make herein outer wall be have necessarily elastic, so under the effect of slope, pulling back the outer wall of cylinder can stressed inside crimp, can take advantage of a situation with the cylinder ramp of returning of guaranteeing to be wider than the needle holder intracavity diameter and to enter the needle holder inner chamber, after the whole cylinder ramp of pulling back enters into the needle holder inner chamber, the cylinder outer wall of pulling back can also reach maximum with bounce, and put on the inwall of needle holder inner chamber, the frictional force that is produced between them is greater than the frictional force of needle holder outer wall and syringe cylinder neck inside, so only need slightly to after-applied certain pulling force, just needle holder can be pulled back, and needle holder is pulled in the injector cartridge, realized the safety self-destruct of syringe.

Claims

1, a kind of core bar structure that is used for safety self-destructing syringe, it mainly comprises the body of rod (1), the body of rod (1) end is provided with the cylinder of pulling back (2), pull back and be socketed with plug (3) between the cylinder (2) and the body of rod (1), it is characterized in that: the described cylinder of pulling back (2) locates to offer long opening (4), long opening (4) is parallel to the cylinder of pulling back (2) and offers, cylinder (2) the outer wall place that pulls back is provided with slope (5), slope (5) is lower near the place, cylinder (2) end that pulls back, slope (5) is higher near plug (3) portion, and slope (5) eminence forms step (6) with cylinder (2) outer wall of pulling back.

2, a kind of core bar structure that is used for safety self-destructing syringe according to claim 1, it is characterized in that: the described cylinder of pulling back (2) locates to be provided with oblique breach (7), and oblique breach (7) becomes 1 to spend to 179 degree settings with respect to the cylinder of pulling back (2).

3, a kind of core bar structure that is used for safety self-destructing syringe according to claim 1 is characterized in that: described long opening (4) can be rectangular-shaped, oval row shape, trapezoidal shape, triangle.

4, a kind of core bar structure that is used for safety self-destructing syringe according to claim 1, it is characterized in that: the height of described step can be 0.1mm～5mm.

5, a kind of core bar structure that is used for safety self-destructing syringe according to claim 1 is characterized in that: the described cylinder of pulling back (2) end is circular-arc.

6, a kind of core bar structure that is used for safety self-destructing syringe according to claim 1, it is characterized in that: the diameter of the described cylinder of pulling back (2) is 0.4mm～7mm.