Syringe Gasket Segmentation for Sliding Resistance
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Solution Overview
Problem
Existing syringe gaskets with embedded elements experience increased sliding resistance due to the arrangement of the element, which hinders smooth insertion and movement within the barrel.
Innovation Solution
A syringe gasket design featuring a first member with a large diameter part and a small diameter part, along with a second member connected to the small diameter part, and an element disposed between the members. This configuration allows for easy elastic deformation and minimizes sliding resistance by optimizing the contact areas and reducing the thickness of overlapping parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an element (microchip) is embedded in the gasket to store production data, then quality control capability is improved, but sliding resistance increases making insertion difficult
Solution Approach 1:
The gasket is divided into a first member (contact portion) and a second member (element housing portion). The element is embedded only in the second member, separating the data storage function from the sliding contact function. This segmentation allows the contact portion to remain thin and flexible for smooth sliding, while the element is accommodated in a dedicated housing that does not interfere with the sliding surface.
2Strength
If the gasket has uniform thickness to ensure structural integrity, then strength is improved, but elastic deformation capability deteriorates
Solution Approach 1:
The gasket exhibits non-uniform thickness distribution: the first member (contact portion) has a smaller thickness to enable elastic deformation and close contact with the barrel inner surface, while the second member (element housing portion) has a larger thickness to provide structural support and accommodate the embedded element. This local differentiation optimizes both deformation capability and structural integrity in their respective zones.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The syringe gasket effectively suppresses sliding resistance while maintaining liquid-tightness, ensuring ease of movement and efficient operation within the syringe barrel.
Implementation Method 1
the first member and the second member having elasticity, the first member having a recess that is recessed from an end surface on the side of the second member toward the large diameter part in the axial direction
Data Source
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AI summary
The present invention is characterized by including: a first member having a large diameter part and a small diameter part; a second member configured to be connected to the first member from a side of the small diameter part; and an element disposed between the first member and the second member, the first member having a recess on an end surface on a side of the second member, the recess having a bottom that reaches a boundary position between the large diameter part and the small diameter part or a certain position on the side of the second member relative to the boundary position, the second member having a projection that projects toward the first member and is configured to fit into the recess with the element disposed between the recess and the projection, and having a screw hole extending from an end surface of the second member on an opposite side to the first member to an inside of the projection to allow a screw part of the plunger to be screwed thereinto.