CN217187287U

CN217187287U - Low-residue injector

Info

Publication number: CN217187287U
Application number: CN202220501667.XU
Authority: CN
Inventors: 巩雪媛
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-03-08
Filing date: 2022-03-08
Publication date: 2022-08-16
Anticipated expiration: 2032-03-08

Abstract

The utility model discloses a low syringe that remains, it includes the needle tubing, the core bar front end is equipped with the fixed column, fixed column middle part periphery is equipped with first annular, fixed column lower part periphery is equipped with the second annular, the fixed column top is equipped with the projection, fixed column periphery cover is equipped with the piston, piston bottom opening, piston cavity is equipped with annular boss, annular boss cooperatees with first annular, the piston top is equipped with the column cap, the column cap external diameter is the same with needle tubing nipple internal diameter, column cap length is the same with needle tubing nipple length, the column cap front end is the round platform shape, so that correct the position that the column cap gets into the needle tubing nipple. The utility model has the advantages of stable structure, convenient installation, safety and environmental protection.

Description

Low-residue injector

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to low syringe that remains.

Background

The injector is a common medical appliance, and consists of a needle tube with a small hole at the front end and a matched core rod, wherein liquid or gas is sucked from the small hole at the front end of the needle tube when the core rod is pulled out, and the liquid or gas is extruded when the core rod is pushed in. The existing injector has the problems of more residual liquid, injection error caused by poor structural stability and the like.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a stable in structure, the little low syringe that remains of injection error nature, it includes needle tubing and core bar, the core bar front end is equipped with the fixed column, fixed column middle part periphery is equipped with first annular, fixed column lower part periphery is equipped with the second annular, the fixed column top is equipped with the projection, fixed column periphery cover is equipped with the piston, piston bottom opening, piston cavity is equipped with annular boss, annular boss cooperatees with first annular, the piston top is equipped with the column cap, the column cap external diameter is the same with needle tubing nipple internal diameter, column cap length is the same with needle tubing nipple length, the column cap front end is the round platform shape, so that the correction column cap gets into the position of needle tubing nipple.

The periphery of the piston is provided with at least one annular groove.

The diameter of the first ring groove is larger than that of the second ring groove.

The diameter of the bottom opening of the piston is smaller than that of the first ring groove, and the bottom opening of the piston is matched with the second ring groove.

The included angle alpha between the top surface of the circular table at the front end of the column cap and the side surface is more than or equal to 45 degrees and less than or equal to 60 degrees.

The fixing column is made of plastic materials.

The piston is made of rubber materials.

Use the utility model discloses a beneficial effect is: 1. in order to promote the leakproofness among the prior art, be equipped with the rubber ring in the piston periphery, in the use, the rubber ring has produced very strong frictional force with the needle tubing inner wall, rubs the piston off easily, through the gomphosis of first annular and annular boss, when can realizing that piston and core bar can dismantle and be connected, has strengthened piston and core bar again and has been connected the steadiness. 2. Because the characteristic of column cap material, the skew condition can appear in the column cap in the use, leads to the column cap can't accurately enter into the needle tubing nipple, can't realize low residual effect, so the applicant has carried out optimal design to the structure, and the projection provides the supporting role for the piston column cap, has improved the degree of accuracy that the column cap enters into the needle tubing nipple. 3. The front end of the column cap is designed into a round table shape, so that the accuracy of piston propulsion is further improved, and the aim of low residue is fulfilled.

Drawings

Fig. 1 is a schematic cross-sectional view of the present invention.

Fig. 2 is a schematic sectional view of the piston according to the present invention.

The reference numerals include:

1 is a needle tube, 1-1 is a needle tube nipple,

2 is a core bar, 2-1 is a fixed column, 2-2 is a second annular groove, 2-3 is a first annular groove, 2-4 is a convex column, 3 is a piston, 3-1 is a column cap, and 3-2 is an annular boss.

Detailed Description

In order to make the purpose, technical solution and advantages of the present technical solution more clear, the present technical solution is further described in detail below with reference to specific embodiments. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present teachings.

As shown in figures 1 and 2, the utility model discloses a low-residue injector with stable structure and small injection error, which comprises a needle tube 1, a core bar 2 in the needle tube, a fixed column 2-1 arranged at the front end of the core bar 2, a first annular groove 2-3 arranged at the middle periphery of the fixed column 2-1, a second annular groove 2-2 arranged at the lower periphery of the fixed column 2-1, a convex column 2-4 arranged at the top of the fixed column 2-1, a piston 3 sleeved at the periphery of the fixed column 2-1, an opening at the bottom of the piston 3, an annular boss 3-2 arranged in the inner cavity of the piston 3, the annular boss 3-2 matched with the first annular groove 2-3, a column cap 3-1 arranged at the top of the piston 3, the outer diameter of the column cap 3-1 is the same as the inner diameter of the nipple needle tube 1-1, the length of the column cap 3-1 is the same as the length of the nipple needle tube 1-1, the front end of the column cap 3-1 is in a round table shape so as to correct the position of the column cap entering the nipple of the needle tube. The periphery of the piston 3 is provided with at least one annular groove. The diameter of the first ring groove 2-3 is larger than the diameter of the second ring groove 2-2. The diameter of the bottom opening of the piston 3 is smaller than that of the first ring groove 2-3, and the bottom opening of the piston 3 is matched with the second ring groove 2-2. The included angle alpha between the top surface of the circular table at the front end of the column cap 3-1 and the side surface is more than or equal to 45 degrees and less than or equal to 60 degrees. The fixing column 2-1 is made of plastic materials. The piston 3 is made of rubber material.

This product is when in actual use, in order to promote the leakproofness among the prior art, is equipped with the rubber ring in the piston periphery, and in the use, the rubber ring has produced very strong frictional force with the needle tubing inner wall, rubs the piston easily, through the gomphosis of first annular and annular boss, when can realizing that piston and core bar can dismantle and be connected, has strengthened the piston again and has been connected the steadiness with the core bar. Because the characteristic of column cap material, the skew condition can appear in the column cap in the use, leads to the column cap can't accurately enter into the needle tubing nipple, can't realize low residual effect, so the applicant has carried out the secondary to the structure and has improved the secondary and improved for the piston column cap the design of projection provides the supporting role, has improved the degree of accuracy that the column cap enters into the needle tubing nipple greatly. The front end of the column cap is designed into a round table shape, so that the accuracy of piston propulsion is further improved, the injection error is reduced, and the aim of low residue is fulfilled.

The foregoing is only a preferred embodiment of the present invention, and many variations can be made in the specific embodiments and applications of the present invention by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A low residue syringe, comprising: the piston comprises a needle tube and a core rod, wherein a fixing column is arranged at the front end of the core rod, a first annular groove is formed in the periphery of the middle of the fixing column, a second annular groove is formed in the periphery of the lower portion of the fixing column, a protruding column is arranged at the top of the fixing column, a piston is sleeved on the periphery of the fixing column, the bottom of the piston is open, an annular boss is arranged in an inner cavity of the piston and matched with the first annular groove, a column head is arranged at the top of the piston, the outer diameter of the column head is the same as the inner diameter of a needle tube nipple, the length of the column head is the same as that of the needle tube nipple, and the front end of the column head is in a round platform shape so as to correct the position of the column head entering the needle tube nipple.

2. A low residue syringe as claimed in claim 1, wherein: the periphery of the piston is provided with at least one annular groove.

3. A low residue syringe as claimed in claim 1, wherein: the diameter of the first ring groove is larger than that of the second ring groove.

4. A low residue syringe as claimed in claim 2, wherein: the diameter of the bottom opening of the piston is smaller than that of the first ring groove, and the bottom opening of the piston is matched with the second ring groove.

5. The low residue syringe of claim 4 wherein: the included angle alpha between the top surface of the circular table at the front end of the column cap and the side surface is more than or equal to 45 degrees and less than or equal to 60 degrees.

6. A low residue syringe as claimed in claim 1, wherein: the fixing column is made of plastic materials.

7. A low residue syringe as claimed in claim 1, wherein: the piston is made of rubber materials.