An inner needle seat structure for a safe self-destruction syringe

Abstract

The invention discloses an inner needle seat structure for a safe self-destructing syringe, which is characterized in that: the inner needle seat body is provided with a needle tube base, and an elastic sealing spacer base integrated with the needle tube base The two are integrated into a single structure or a split assembly structure. An annular step or an annular slope is formed between the needle tube base and the elastic sealing limit base. Buffer gap, the outer wall of the elastic seal limit base outside the annular buffer gap forms a ring-shaped seal limit engagement part. The product overcomes the defects caused by the characteristics of the material itself. The occlusal force and sealing performance between the inner needle seat and the pulling force required for the inner needle seat to be reduced when the inner needle seat is pulled back make the two contradictory key elements reach an optimal balance point.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to an inner needle seat structure for a safe self-destruction syringe, and in particular to its mechanical connection structure. Background technique [0002] Comparative document 1, patent number: ZL200410017938.0, application date: 2004.04.26, announcement number: CN1689654, patentee: Shanghai Toptop Biochemical Technology Co., Ltd., this case discloses "a damageable safety syringe", including: a jacket 1. The barrel neck at the upper end of the jacket, the needle, and the core rod in the jacket are characterized in that: the top of the inner cavity of the barrel neck is provided with a convex edge, and a needle seat is built in the inner cavity of the barrel neck. The inner wall of the needle seat is a cylindrical hole, and the needle seat The outer wall of the tube is provided with a ring-shaped convex rib, and it is in close contact with the convex edge at the top of th...

AI Technical Summary

Problems solved by technology

[0011] There are many problems in the actual production and use of the split inner needle seat. First, the mold cost of the upper and lower needle seats is relatively high, and the mold opening process is relatively complicated. It is often impossible to demould once, and a second demoulding is required. Second, The upper and lower split needle holders are prone to assembly errors during the assembly process, resulting in product scrapping. At the same time, it increases the difficulty of assembly. Third, in actual use, the upper and lower split needle holders are prone to operational failures, and the working state of the syringe is stable. poor

Images