Valve Seat Inclination for Stable Liquid Medicine Flow
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Solution Overview
Problem
Existing liquid medicine administration devices face challenges in stably opening and closing the valve mechanism during the flow of liquid medicine, leading to fluctuations in opening pressure and potential deformation issues.
Innovation Solution
A liquid medicine administration device featuring a connector with a disk-shaped valve body and an annular valve seat that is inclined radially inward, allowing the valve body to contact the seat, which suppresses stress and deformation, ensuring the valve can be stably opened at a predetermined pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional valve mechanism is used in liquid medicine administration devices, then the valve can open and close during liquid medicine flow, but the opening pressure fluctuates and deformation occurs
Solution Approach 1:
The valve seat is designed with an inclined portion at its radially inner side, creating a localized structural feature that specifically addresses stress distribution in the critical opening/closing region of the valve body. This local modification suppresses deformation at the key stress point without requiring changes to the entire valve structure.
Solution Approach 2:
The valve seat incorporates an asymmetric inclined portion that slopes radially inward toward the tube. This asymmetric geometry is specifically positioned to counteract the stress concentration that occurs during valve operation, providing targeted structural support where needed most to prevent deformation and ensure stable opening pressure.
2Ease of operation
If the valve body is made to open easily during liquid medicine delivery, then flow is facilitated, but deformation of the valve body occurs
Solution Approach 1:
The inclined portion of the valve seat provides localized structural reinforcement at the radially inner side where stress concentration occurs during valve opening. This local support enables the valve body to open easily under liquid medicine pressure while preventing deformation through targeted structural assistance.
Solution Approach 2:
The inclined portion of the valve seat acts as a pre-designed stress distribution structure that is in place before the valve operates. It cushions and distributes the stress that would otherwise concentrate at critical points, preventing deformation before it can occur during the valve opening process.
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 solution ensures the valve remains stably open with a consistent pressure, maintaining a stable flow rate of liquid medicine, preventing deformation and pressure fluctuations during administration.
Implementation Method 1
when pressure is applied to the valve body from the liquid medicine delivered from the device body, stress generated on the radially inner side that is the opening/closing hole side is suppressed because the inclined portion of the valve seat with which the valve body comes in contact is inclined radially inward, and accordingly, the deformation amount of the valve body can be suppressed
Data Source
AI summary
A liquid medicine administration device includes: a needle unit configured to be inserted into and placed on a living body; a liquid medicine supply device provided separately from the needle unit and configured to deliver a liquid medicine filled inside from a distal portion; a tube configured to allow the liquid medicine to flow, the tube having a distal end connected to the needle unit; and a connector to which the liquid medicine supply device is attached, the connector being located at a proximal end of the tube. The connector includes: a valve body that has a disk shape and that opens during delivery of the liquid medicine to allow the liquid medicine supply device to communicate with the tube, and a valve seat that is annular and provided on a tube side with respect to the valve body, the valve seat protruding toward and contacting the valve body.