CN216755135U - Locking type residue-free self-destruction syringe - Google Patents

Abstract

The utility model relates to the field of medical instruments, in particular to a locking type residue-free self-destruction injector which comprises a needle cylinder, a needle tube, a rubber plug and a core rod, wherein the needle tube is sleeved at the front end of the needle cylinder, the rubber plug is positioned in the needle cylinder, one end of the rubber plug is fixedly connected with the core rod, the rear end of the core rod is connected with a pressing hand, a locking cavity is formed in the rear end of the needle cylinder, correspondingly, a locking tooth is fixed on the core rod and close to the rear end, four triangular convex ribs are uniformly arranged on a circular base, the outer diameter of the locking tooth is larger than the inner diameter of the locking cavity, and the locking tooth is matched with the locking cavity in a matching manner. The product of the utility model realizes double self-destruction and effectively prevents the product from being reused.

Description

Locking type residue-free self-destruction syringe

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a locking type residue-free self-destruction syringe.

Background

The self-destruction syringe is a disposable syringe product which can prevent repeated use after use, and after injection, the core bar can not be drawn out of the syringe by hand or mechanical force, so as to achieve the purposes of self-locking, damaging the sealing performance of the piston, or deducing the push rod of the syringe, and finally preventing repeated use. In the prior art, the self-destruction structure of the self-destruction syringe has various structures, but most of the self-destruction syringes still have complicated structure or complicated operation, or have poor self-destruction effect although the structure is simple (mainly shown in the condition that the self-locking is invalid when the core rod is pulled back by force, and the core rod is easy to be pulled out from the syringe without self-destruction).

Disclosure of Invention

Aiming at the defects in the prior art, the utility model aims to provide a locking type residue-free self-destruction syringe with reasonable structural design.

In order to achieve the purpose, the utility model adopts the technical scheme that: a locking type residue-free self-destruction injector comprises a needle cylinder, a needle tube, a rubber plug and a core rod, wherein the needle tube is sleeved at the front end of the needle cylinder, the rubber plug is positioned in the needle cylinder, one end of the rubber plug is fixedly connected with the core rod, and the rear end of the core rod is connected with a pressing hand; four triangular convex ribs are evenly arranged on the circular base, the outer diameter of the locking teeth is larger than the inner diameter of the locking cavity, and the locking teeth are matched with the locking cavity in a matching mode.

Furthermore, two pull-off points are designed between the rear end of the core rod and the pressing hand, and the pressing hand and the rear end of the core rod are connected with the surface through the two pull-off points. The design is that a self-destruction point is added on the basis of locking self-destruction of a locking cavity and a locking tooth, when the core rod is forcibly pulled back, the two pull-break points are broken, and the rest parts of the core rod except the hand part are still in the needle cylinder, so that the self-destruction is further realized.

Furthermore, a locking ring is clamped at the rear side of the locking cavity inside the rear end of the needle cylinder, the diameter of an inner hole of the locking ring is smaller than that of the locking cavity, and the inner wall of the locking ring and the inner wall of the locking cavity are in inclined plane transition. The design facilitates the core bar to be easily inserted into the needle cylinder.

Compared with the prior art, the utility model has the beneficial effects that:

according to the utility model, the locking cavity and the locking teeth are mutually matched, after the core rod enters the needle cylinder, the locking teeth are extruded by the locking cavity and deformed into an arc shape from the straight teeth, and self-locking of the locking teeth and the straight teeth is realized, so that the locking force of the locking teeth is greatly improved, and self-destruction of a product is realized; in addition, due to the design of the two pull-off points, when the core rod is forcibly pulled back, the two pull-off points are broken, the product is subjected to double self-destruction, and the product is effectively prevented from being repeatedly used.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the structure of the syringe according to the present invention;

FIG. 3 is a schematic view of the core rod structure of the present invention;

FIG. 4 is an enlarged view of a portion A of FIG. 1;

FIG. 5 is a top view of the locking tooth of the present invention;

FIG. 6 is a schematic top view of the triangular rib of the present invention on the circular base of the locking teeth;

the novel syringe comprises a needle tube 1, a needle tube 2, a needle cylinder 3, a rubber plug 4, a core rod 5, a locking cavity 6, a locking ring 7, a triangular convex rib 8, locking teeth 8.1, a circular base 8.2, a four-tooth locking block 9, a snapping point 10 and a handle.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. In addition, the terms "fixedly connecting" and "fixing" are used in the prior art, and conventional fixing means such as gluing and the like are used. And all parts not described in detail below should be performed as in the prior art.

It should be noted that, in the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "center", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

In addition, the details are not described below with reference to the prior art.

As shown in fig. 1-6, the locking type residue-free self-destruction injector of the present invention comprises a syringe 2, a needle tube 1, a rubber plug 3, and a core rod 4. Wherein the front end of the needle cylinder 2 is sleeved with the needle tube 1 according to the conventional mode, the rubber plug 3 is positioned in the needle cylinder 2, one end of the rubber plug 3 is fixedly connected with the core bar 4 according to the conventional mode, and the rear end of the core bar 4 is connected with the pressing hand 10 according to the conventional mode. The front end of the needle cylinder 2 is a needle tube mounting end, the rear end is a curled end, a locking cavity 5 is integrally formed in the curled end of the needle cylinder 1, and the locking cavity 5 is cylindrical. Inside and being located the rear side shaping of locking chamber 5 at syringe 1 rear end has the annular groove, the inslot is equipped with the check ring 6 of medical rubber material or silica gel material according to conventional mode card, 6 hole diameters of check ring are less than the diameter of locking chamber 5 and 6 inner walls of check ring and 5 walls of locking chamber between for the inclined plane transition, this kind of design makes things convenient for core bar 4 easily to insert in syringe 2, check ring 6 and 4 rear end peripheries of core bar suit the cooperation and play the frictional resistance to the core bar when the pulling core bar in addition. The locking tooth 8 is fixedly connected to the position, matched with the locking cavity 5, of the core rod 4 in a conventional mode, the locking tooth 8 and the core rod 4 are coaxially arranged, the locking tooth 8 comprises a circular base 8.1 and four-tooth locking blocks 8.2 connected to the circular base 8.1, the four teeth on the four-tooth locking blocks 8.2 are straight teeth, the four teeth are radially and evenly distributed, and the four teeth of the locking tooth 8 are made of medical rubber materials and have the deformation capacity under external force driving. Still even integrated into one piece has four triangle-shaped protruding muscle 7 on circular base 8.1, the outside (specifically the circle that four tooth outer ends are located) diameter of locking tooth 8 is greater than the internal diameter of locking chamber 5, four straight-teeth of locking tooth 8 receive the extrusion of locking chamber 5 wall to be out of shape as shown in figure 4 by straight shape behind core bar 4 inserts syringe 1, through the extrusion force between locking tooth 8 and the 5 inner walls in locking chamber, frictional force fit for, thereby realize the locking between locking tooth 8 and the locking chamber 5, make the product possess the self-destruction performance.

Two pull-off points 9 are designed between the rear end of the core rod 4 and the pressing hand part 10, and the pressing hand part 10 and the rear end of the core rod 4 are connected with the surface through the two pull-off points 9. The self-destruction point is added on the basis that the locking cavity and the locking teeth realize locking self-destruction, when the core rod is forcibly pulled back, the two pull-off points 9 are broken, and the rest parts of the core rod 4 except the pressing part 10 are still in the syringe 2, so that the self-destruction is further realized.

The utility model realizes double self-destruction setting, effectively prevents the product from being reused, and has more reasonable structure and simpler manufacture compared with the prior art.

Claims (3)

1. A locking type residue-free self-destruction injector comprises a needle cylinder, a needle tube, a rubber plug and a core rod, wherein the needle tube is sleeved at the front end of the needle cylinder, the rubber plug is positioned in the needle cylinder, one end of the rubber plug is fixedly connected with the core rod, and the rear end of the core rod is connected with a pressing hand; four triangular convex ribs are evenly arranged on the circular base, the outer diameter of the locking teeth is larger than the inner diameter of the locking cavity, and the locking teeth are matched with the locking cavity in a matching mode.

2. The locking type residue-free self-destruction syringe as claimed in claim 1, wherein two pull-off points are designed between the rear end of the core rod and the pressing hand, and the pressing hand and the rear end of the core rod are connected with the surface through the two pull-off points.

3. The locking type residue-free self-destruction syringe as claimed in claim 1 or 2, wherein a locking ring is clamped at the rear side of the locking cavity inside the rear end of the syringe, the diameter of the inner hole of the locking ring is smaller than that of the locking cavity, and the inner wall of the locking ring and the inner wall of the locking cavity are in slope transition.

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