Apertureless Cylindrical Sensor Guide Wire Jacket

Solution Overview

Problem

Existing sensor guide wires for intravascular measurements face challenges in maintaining accuracy and safety due to asymmetrical torque transfer and bend radius issues caused by apertures in the jacket's circumferential surface, which hinder precise navigation and exposure of the sensor element within the body.

Innovation Solution

A sensor guide wire design featuring a cylindrical jacket with a constant cross section and no apertures along its circumferential surface, allowing for symmetrical torque transfer and bend radius, and incorporating axial openings for fluid access to the sensor element, ensuring accurate physiological variable measurements without compromising navigation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If apertures are included in the jacket's circumferential surface to expose the sensor element, then the sensor element can be exposed to fluid for measurement, but asymmetrical torque transfer and bend radius issues occur that hinder precise navigation

Engineering Contradiction:

Improvesensor element exposureVSAvoidnavigation precision

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The jacket is divided into two functional zones: an apertureless circumferential surface for symmetrical torque transfer and bend radius control, and axial openings for fluid access to the sensor element. This segmentation allows each zone to optimize its specific function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the jacket have different properties: the circumferential surface is apertureless to provide symmetrical mechanical properties for navigation, while axial openings are provided to allow fluid access for measurement. Each local region is optimized for its specific purpose.

Inventive Principle:

Principle #3Local quality

2Measurement precision

If apertures are included in the jacket's circumferential surface, then the sensor element can be exposed to fluid, but fluid leakage occurs compromising safety

Engineering Contradiction:

Improvesensor element exposureVSAvoidfluid leakage

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The jacket is divided into two functional zones: an apertureless circumferential surface for symmetrical torque transfer and bend radius control, and axial openings for fluid access to the sensor element. This segmentation allows each zone to optimize its specific function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of providing radial apertures in the circumferential surface, fluid access is provided through axial openings along the length of the guide wire. This dimensional change allows fluid access while maintaining the integrity of the circumferential surface for symmetrical mechanical properties.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Ease of operation

If the jacket has a constant cross section, then symmetrical torque transfer and bend radius are achieved, but manufacturing complexity increases

Engineering Contradiction:

Improvenavigation precisionVSAvoidjacket fabrication

Core Design Contradiction:

Ease of operationVSEase of manufacture

Solution Approach 1:

The jacket is divided into two functional zones: an apertureless circumferential surface for symmetrical torque transfer and bend radius control, and axial openings for fluid access to the sensor element. This segmentation allows each zone to optimize its specific function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The apertureless cylindrical jacket structure serves multiple functions simultaneously: it provides symmetrical torque transfer, maintains constant bend radius for precise navigation, and when combined with axial openings, allows fluid access to the sensor element. This multi-functionality reduces the need for additional components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS10117620B2Sensor guide wire device and system including a sensor guide wire device

Publication Date: 2018.11.06 ST JUDE MEDICAL COORDINATION CENT

AI summary

A sensor guide wire for an intravascular measurement of a physiological variable in a living body may include a sensor element configured to measure the physiological variable based on exposure to fluid in the living body; and a cylindrical-shaped jacket forming an interior space housing the sensor element. The jacket comprises an outer circumferential wall with a circumferential surface extending between distal and proximal longitudinal ends of the jacket. The outer circumferential wall of the jacket does not include any apertures along its circumferential surface so as to prevent fluid from passing through the outer circumferential wall and/or the jacket has a constant cross section along its entire length.