Pressure Sensor Through-Hole Insulation for Compact Catheter Use
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Solution Overview
Problem
Conventional pressure sensors used in medical diagnosis are difficult to achieve compactness, insulation, and high reliability, especially when inserted into coronary arteries, which poses a challenge for patient comfort and accuracy.
Innovation Solution
A pressure sensor design featuring a sensor body with a through hole for a lead wire, an insulation layer on the hole's inner wall, and a conducting body core part without insulation coating, ensuring electrical connection through a brazing material, allowing for a compact and reliable configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pressure sensor configuration is used, then the sensor can perform basic pressure measurement, but it cannot achieve compactness, reliable insulation, and high reliability simultaneously
Solution Approach 1:
The lead wire is segmented into two functional parts: a conducting body core part that passes through the through hole for electrical connection, and an insulation coating that is removed from the core part. This segmentation allows the lead wire to simultaneously provide electrical conductivity and insulation, resolving the contradiction between insulation reliability and structural simplicity.
Solution Approach 2:
The insulation layer formed on the inner wall of the through hole acts as an intermediary between the conducting body core part and the sensor body. This intermediary structure ensures reliable insulation while allowing the lead wire to maintain its electrical connection function, thus improving insulation reliability without significantly increasing device complexity.
2Volume of moving object
If the pressure sensor is made compact for catheter insertion, then patient burden is reduced, but insulation and reliability become more difficult to ensure
Solution Approach 1:
The insulation coating is selectively removed only from the conducting body core part that needs to pass through the through hole, while the insulation layer on the through hole inner wall remains intact. This local quality modification allows the lead wire to maintain insulation properties in the compact sensor structure while ensuring reliable electrical connection at the critical interface.
3Reliability
If a lead wire with insulation coating is used, then electrical connection is maintained, but the through hole requires larger diameter to accommodate the insulated wire
Solution Approach 1:
The insulation coating is extracted (removed) from the conducting body core part of the lead wire. This extraction allows the through hole to have a smaller diameter while still maintaining electrical connection reliability, as the bare conducting body core part can pass through the narrowed through hole without requiring the insulation coating to be compressed or deformed.
Data Source
AI summary
Provided is a pressure sensor that is compact, ensures insulation, and is highly reliable. A pressure sensor (1) comprises: a sensor body (2); a pressure sensor element (21) provided on one surface side of the sensor body (2); a through hole (24) which is formed from the one surface side of the sensor body (2) toward another surface side of the sensor body, and through which a lead wire (3) electrically connected to the pressure sensor element (21) is passed; and an insulation layer (24a) formed in the inner wall of the through hole (24). Passed through the through hole (24) is a conducting body core part (32), which is a part of the lead wire (3) from which an insulation coating has been removed.