Implantable Pressure Sensor Drift Correction Using Fitted Curves
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Solution Overview
Problem
Implantable pressure sensors experience a drift effect due to aging or strain, leading to inaccurate pressure readings over time, which cannot be easily calibrated due to their inaccessibility within the patient.
Innovation Solution
A method involving an external device to derive fit values from measured data, determine a fitted curve using techniques like linear regression, and correct the data to compensate for drift, using an external reference value for atmospheric pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration is performed to compensate for drift effect, then measurement precision is improved, but ease of operation deteriorates due to inaccessibility of implantable sensor
Solution Approach 1:
The patent introduces an external device as an intermediary that performs calibration and drift compensation operations remotely. This external device communicates with the implantable sensor through a communication interface, allowing calibration to be performed without direct physical access to the implanted sensor. The external device acts as a mediator between the user and the implantable sensor, enabling ease of operation while maintaining measurement precision.
2Measurement precision
If drift compensation is performed frequently to maintain accuracy, then measurement precision is improved, but loss of time increases due to repeated calibration intervals
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors the implantable sensor for drift effects and automatically performs compensation operations. The external device receives data from the implantable sensor, analyzes drift patterns, and applies corrections in real-time or near-real-time. This automated feedback loop eliminates the need for manual calibration at regular intervals, maintaining measurement precision while minimizing time loss.
3Duration of action of stationary object
If implantable sensor is used for prolonged period, then duration of action is improved, but reliability deteriorates due to drift effect from aging and strain
Solution Approach 1:
The patent applies preliminary drift compensation by establishing a drift model based on initial characterization of the implantable sensor. During manufacturing or initial setup, the sensor's drift characteristics are measured and stored. This preliminary information is then used to proactively compensate for drift effects throughout the sensor's operational lifespan, preventing accuracy degradation before it occurs. This preliminary action enables long-term reliable operation by pre-establishing compensation strategies.
Data Source
AI summary
A method for correcting a drift effect in measured data obtained using an implantable pressure sensor comprises: obtaining processing data, based on measured data indicative of a measured pressure obtained using the implantable pressure sensor; deriving, from said processing data, a multiplicity of fit values; determining, using said fit values, a fitted curve; and correcting said processing data based on the fitted curve to compensate for a drift effect in said measured data obtained using the implantable pressure sensor.