Blood Pressure Sensor Movement Compensation
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Solution Overview
Problem
Blood pressure sensors within blood vessels can experience abrupt changes due to movement, leading to inaccurate measurements of autoregulation status, which may result in unnecessary clinical interventions.
Innovation Solution
A system that identifies abrupt changes in blood pressure and applies an offset to compensate for these changes, ensuring accurate monitoring by adjusting blood pressure values and autoregulation limits, thereby distinguishing between physiological and non-physiological changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a blood pressure sensor is placed within a blood vessel to monitor autoregulation status, then continuous blood pressure monitoring is achieved, but sensor movement causes abrupt changes in measured pressure leading to measurement inaccuracies
Solution Approach 1:
The system continuously monitors blood pressure measurements and compares consecutive values to detect abrupt changes. When a sudden pressure change exceeds a threshold, the system identifies it as sensor movement and applies compensation by adjusting subsequent measurements with an offset value, thereby maintaining measurement reliability while preserving continuous monitoring capability
Solution Approach 2:
The patent introduces an intermediary compensation mechanism that acts as a mediator between the raw sensor measurements and the final reported values. When sensor movement is detected, an offset value is calculated and applied to subsequent measurements to compensate for the positional change, effectively filtering out noise while preserving genuine physiological changes
2Reliability
If abrupt changes in blood pressure measurements are used to detect sensor movement, then sensor movement can be identified, but genuine physiological blood pressure changes may be misinterpreted as sensor movement
Solution Approach 1:
The system applies partial compensation by using a threshold-based approach where only abrupt changes exceeding a predetermined threshold are treated as sensor movement. This partial action strategy avoids over-compensation that would filter out genuine physiological changes, while still effectively identifying and correcting actual sensor movement events
Solution Approach 2:
The patent dynamically adjusts the offset value applied to compensate for sensor movement based on the magnitude of the detected abrupt change. By changing the compensation parameter proportionally to the detected movement, the system maintains sensitivity to genuine physiological variations while correcting for sensor positional changes
Data Source
AI summary
In some examples, devices, systems, and techniques are configured to compensate for changes in sensed blood pressure due to issues such as blood pressure sensor movement. For example, processing circuitry of a device may determine a difference value between a first blood pressure value representative of a blood pressure at a first time and a second blood pressure value representative of the blood pressure at a second time. Responsive to determining that the difference value is greater than or equal to a threshold value, the processing circuitry may generate updated blood pressure values by applying an offset value to the second blood pressure value and subsequently received blood pressure values that compensates for the difference value between the first blood pressure value and the second blood pressure value.