Guide Wire Pressure Sensor with Hydrophilic Coating for Air Pocket Elimination
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Solution Overview
Problem
Existing pressure measurement devices in stenotic vessels face instability due to the formation of air pockets caused by insufficient wetting, leading to unreliable pressure readings.
Innovation Solution
The design incorporates a guide wire with a tube featuring multiple distal and proximal openings, including concave distal openings and hydrophilic coatings to ensure fluid flow past the pressure sensor, preventing air pockets and enhancing wetting, thereby stabilizing pressure readings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure sensor is mounted in a tube with a single opening, then the device structure is simple, but air pockets form causing unstable pressure readings
Solution Approach 1:
The single tube opening is segmented into multiple openings (first distal opening, second distal opening, third distal opening, first proximal opening, second proximal opening, third proximal opening) distributed around the tube circumference. This segmentation allows fluid to enter through multiple pathways, preventing air pocket formation and ensuring stable pressure readings at the sensor.
2Reliability
If the tube has limited openings, then the device is easier to manufacture, but wetting is insufficient leading to air pocket formation
Solution Approach 1:
Different openings are positioned at specific locations around the tube (distal and proximal ends, distributed circumferentially) to create optimal local fluid entry points. The first distal opening is on the top side, second distal opening is offset right, third distal opening is offset left, with corresponding proximal openings. This local quality distribution ensures comprehensive wetting of the pressure sensor while maintaining manufacturability through standardized opening patterns.
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
This configuration ensures accurate and stable pressure measurements by eliminating air pockets and promoting consistent fluid interaction with the sensor, improving the reliability of pressure readings in biological environments.
Implementation Method 1
a hydrophilic material is coated on at least one of an internal surface of the tube, and a surface of the pressure sensor
Implementation Method 2
the hydrophilic material dissolves and causes an influx of the liquid into the tube
Implementation Method 3
the inverse proportionality between capillary pressure and radius, as shown in the Young-Laplace equation, which describes the capillary pressure difference sustained across the interface between two static fluids due to surface tension
Implementation Method 4
the inverse proportionality between capillary pressure and radius, as shown in the Young-Laplace equation, which describes the capillary pressure difference sustained across the interface between two static fluids due to surface tension
Data Source
AI summary
A pressure sensor configured for biological pressure measurement at a distal end portion of an elongated member comprises a dissolvable hydrophilic material coated on a surface of the pressure sensor. A guide wire for biological pressure measurement may include a tube extending along a longitudinal axis of the guide wire; and a pressure sensor for biological pressure measurement, at least a portion of the pressure sensor being mounted within the tube. The pressure sensor comprises a pressure sensor membrane facing a top side of the tube. A circumferential wall of the tube includes at least six openings: a first distal opening, a second distal opening located on a right side of the tube, a third distal opening located on a left side of the tube, a first proximal opening, a second proximal opening located on a right side of the tube, and a third proximal opening located on a left side of the tube. The first distal opening is larger than the second and third distal openings, and the first proximal opening is larger than the second and third proximal openings.