Medical gasket

A sealing gasket and medical technology, applied in the direction of infusion sets, syringes, hypodermic injection equipment, etc., can solve the problems of increased friction between the sealing gasket and the syringe barrel, pressing in, difficult sealing gaskets, etc., and achieve the goal of reducing the fastening force Effect

Active Publication Date: 2014-11-26
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, although it is necessary to firmly fit the plunger and the gasket, on the other hand, there is also a need to reduce the force (torque) required for rotation in order to facilitate mounting.
In addition, when the thread is excessively turned in pursuit of a firmer fit, there is a problem that the gasket is compressed, and the friction between the gasket and the syringe barrel increases due to the compression. Difficulty pressing the seal in when injecting

Method used

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Examples

Experimental program
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Effect test

Embodiment 1～2 and comparative example 1

[0036] Gaskets of Examples in which the groove diameter of the female thread part of the gasket gradually increases from the side in contact with the chemical solution toward the opposite side of the gasket, and gaskets of Comparative Example in which the groove diameter is the same were produced. The unvulcanized rubber sheet was placed on a forming mold, and formed by vacuum pressing under the conditions of 180° C., 8 minutes, and a processing pressure of 20 MPa to make it vulcanized and bonded.

[0037] The outer diameter of the largest portion of the gasket was 20.0 mm, and Table 1 shows the groove diameter and thread diameter of the female thread portion of the obtained gasket. In addition, the length (depth) of the threaded portion was set to 7.0 mm, and the number of pitches was set to 17 pitches relative to 25.4 mm.

[0038]

[0039] Use a torque wrench (Tohnichi Seisakusho Co., Ltd., BTG60CN) to fit the plunger rod (made of polypropylene resin, the diameter of the e...

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Abstract

The present invention aims to provide a gasket which reduces the clamping force required to fit a plunger rod into the gasket, while maintaining a tight fit therebetween. The present invention relates to a medical gasket including a female screw portion to fit a plunger, on the side opposite to a drug contact surface, the female screw portion having roots or crests which gradually increase in diameter from the drug contact surface side toward the opposite plunger side.

Description

technical field [0001] The present invention relates to a gasket for medical use. Background technique [0002] As a syringe for medical use, a syringe filled with a medical solution in advance (prefilled syringe) is known. Prefilled syringes are used more frequently in recent years because they can be used easily without the labor of transferring the drug solution, and can prevent medical errors in transferring the drug solution. This prefilled syringe is different from conventional syringes (syringes that draw a medical solution from other containers such as vials and use the drug solution immediately before use), and thus require long-term contact with the drug solution. The performance of the container (Patent Document 1). [0003] In prefilled syringes, the plunger rod and the packing are sometimes fitted in advance, and the plunger is sometimes reused by fitting the plunger rod and the packing during use. In the latter case, in order to fit the plunger rod and the g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61M5/315
CPCA61M5/31513A61M5/31515A61M5/31
Inventor 中野宏昭八尾英治岩野慎也石田直之
Owner SUMITOMO RUBBER IND LTD
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