Intravascular Pressure Sensor Calibration at Point of Use
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Solution Overview
Problem
Current intravascular pressure sensors require pre-calibration before use, which can be unreliable due to variability in microfabricated sensors, leading to potential inaccuracies and the need for disposal if calibration is lost.
Innovation Solution
A method for calibrating intravascular pressure sensors at the point of use using data from a secondary pressure measurement device, such as an automated aortic pressure monitor, allowing for calibration over relevant temperature and pressure ranges, and enabling recalibration if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If factory calibration is performed prior to administration, then the sensor output can be adjusted to reflect calibrated conditions, but the calibration may slip due to improper storage or differences between control electronics, leading to potential inaccuracies
Solution Approach 1:
The patent performs calibration at the point of use immediately before measurement rather than during manufacturing. This preliminary action ensures the calibration is fresh and relevant to the specific measurement conditions, eliminating the time gap that allows calibration drift to occur during storage and transport.
Solution Approach 2:
The system performs self-calibration by using the relationship between aortic pressure and distal coronary pressure during the measurement process itself. The control system automatically adjusts the sensor output based on real-time pressure relationships, eliminating the need for separate calibration procedures and ensuring continuous accuracy.
2Adaptability or versatility
If factory calibration is performed with span and temperature calibration over a range of pressures and temperatures, then the sensor can be adjusted for various conditions, but redundant testing steps during manufacturing increase time and cost of production
Solution Approach 1:
Instead of performing extensive calibration testing during manufacturing, the system performs the necessary calibration adjustments at the point of use. This eliminates redundant manufacturing steps while ensuring the sensor is calibrated for the specific patient's physiological conditions when actually needed.
Solution Approach 2:
The system dynamically adjusts calibration parameters based on real-time measurement conditions rather than relying on fixed factory calibration settings. By using the relationship between aortic and distal pressures during the procedure, the system adapts to the specific temperature and pressure ranges encountered in each patient.
Data Source
AI summary
The invention is a method for calibrating an intravascular pressure sensor at the point of use. By using data from a secondary pressure measurement device, e.g., an automated aortic pressure monitor, the pressure sensor can be easily calibrated over a range of temperatures and pressures relevant to the patient. Accordingly, an intravascular pressure sensor can be calibrated without undergoing a factory calibration. Additionally, in the event that the calibration is lost, the sensor can be recalibrated.