Dynamic Bio Impedance Range Adjustment for Medical Devices
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Solution Overview
Problem
Medical devices that measure bio impedance values for monitoring patient conditions, such as heart failure, face inaccuracies when the measured values fall outside the device's predetermined measurement range due to changes in patient weight or device migration, leading to unreliable data for clinicians.
Innovation Solution
The bio impedance measurement range of a medical device is dynamically adjusted by modifying the excitation signal applied to the sensing circuitry, ensuring the measured value remains within a predetermined portion of the range, thus maintaining accurate bio impedance measurements over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed bio impedance measurement range is used, then the device structure is simple and easy to manufacture, but the measurement accuracy deteriorates when patient conditions change or device position shifts
Solution Approach 1:
The patent implements dynamic adjustment of the excitation signal amplitude based on detected bio impedance values. The system transitions from a fixed measurement range to a dynamic one that adapts to changing patient conditions and device positions, thereby maintaining measurement accuracy without requiring complex hardware modifications
Solution Approach 2:
The system changes the excitation signal parameter (amplitude) based on the detected bio impedance magnitude. When bio impedance values indicate that the measurement is approaching the boundaries of the current measurement range, the system adjusts the excitation signal amplitude to expand or contract the measurement range accordingly, resolving the contradiction between fixed simplicity and adaptive accuracy
2Adaptability or versatility
If the excitation signal amplitude is increased to expand measurement range, then the measurable bio impedance values are extended, but the energy consumption increases
Solution Approach 1:
The system dynamically adjusts the excitation signal amplitude based on real-time bio impedance measurements. The amplitude is increased only when necessary to expand the measurement range, and reduced when the measurement range is sufficient, thereby achieving adaptability while minimizing energy consumption through conditional adjustment rather than continuous high-power operation
Solution Approach 2:
The excitation signal amplitude parameter is changed based on the detected bio impedance magnitude. The system monitors whether measurements are approaching range boundaries and adjusts the amplitude accordingly, allowing the device to expand measurement range coverage only when needed, thus balancing versatility with energy efficiency
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 approach allows for more reliable monitoring of heart failure progression and treatment effectiveness by maintaining accurate bio impedance measurements, even as patient conditions change or the device's position within the body shifts.
Implementation Method 1
sensing circuitry configured to sense a bio impedance... determine a sensed bio impedance value within a bio impedance measurement range
Data Source
AI summary
This disclosure is directed to devices, systems, and techniques for dynamically adjusting a bio impedance measurement range. An example device includes a plurality of electrodes. The device also includes sensing circuitry configured to sense a bio impedance and processing circuitry. The processing circuitry is configured to apply an excitation signal to the sensing circuitry and, based on the application of the excitation signal, determine a sensed bio impedance value within a bio impedance measurement range. The processing circuitry is also configured to determine whether the sensed bio impedance value is within a predetermined portion of the bio impedance measurement range for a predetermined period of time and based on the sensed bio impedance value being within the predetermined portion of the bio impedance measurement range for the predetermined period of time, adjust the excitation signal.