Posture Sensor Signal Drift Detection and Offset Correction
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Solution Overview
Problem
Medical devices, such as implantable medical devices (IMDs), face challenges in accurately detecting patient posture states due to signal shift and drift in posture sensors, which can lead to inappropriate adjustments or failures in therapy delivery, affecting therapeutic efficacy.
Innovation Solution
The implementation of a technique that involves receiving posture sensor data, comparing it to reference data to detect signal drift or shift, and applying offset corrections to ensure accurate posture state detection, thereby adjusting therapy parameters or suspending therapy until the offset is addressed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If posture sensor data is used to detect patient posture states, then therapy delivery can be adjusted based on posture, but signal drift and shift cause inaccurate detection
Solution Approach 1:
The system performs preliminary calibration by storing reference posture sensor data when the patient is in known reference posture states. This pre-established baseline is then used to detect drift and shift in subsequent measurements, enabling accurate posture detection despite sensor degradation over time.
Solution Approach 2:
The system continuously compares current posture sensor data against stored reference data to detect offsets. When drift or shift is detected, the system generates notifications to clinicians and can adjust therapy parameters, creating a closed-loop feedback mechanism that maintains detection accuracy.
2Measurement precision
If signal offset correction is applied continuously, then detection accuracy is maintained, but device complexity and processing requirements increase
Solution Approach 1:
Rather than continuously correcting all sensor data, the system applies offset corrections selectively based on detected drift magnitude and clinical significance. Therapy adjustments are made only when posture detection accuracy would meaningfully impact treatment, reducing unnecessary processing complexity.
Solution Approach 2:
The system changes operational parameters by adjusting therapy delivery based on detected posture states and offset corrections. Therapy parameters such as stimulation intensity or pump flow rate are modified in response to corrected posture information, maintaining accuracy without requiring permanent system architecture changes.
3Reliability
If therapy is suspended until offset is addressed, then accurate therapy delivery is ensured, but treatment continuity is interrupted
Solution Approach 1:
The system dynamically adjusts therapy delivery based on the magnitude and clinical significance of detected offsets. Rather than rigid suspension, therapy parameters are adaptively modified to maintain effectiveness despite sensor drift, allowing continuous treatment with adjusted parameters when appropriate.
Solution Approach 2:
The system discards unreliable posture sensor data when significant drift is detected and recovers accurate posture information through alternative methods or recalibration. Therapy continues using available reliable data while problematic sensor readings are temporarily discarded, maintaining treatment continuity without compromising accuracy.
Data Source
AI summary
In general, the disclosure relates to medical devices and systems for detecting the posture state of patient. For example, a medical system may detect a posture state of a patient and deliver therapy based at least in part on the detected patient posture state. In some examples, the system may comprise a posture sensor that generates posture sensor data when a patient is in a posture state, and a processor that receives the first posture sensor data, compares the first posture state data to reference posture sensor data, and detects the presence of at least one of sensor signal drift or sensor signal shift for the posture sensor based at least in part on the comparison. In some examples, the processor may be configured to determine one or more offset correction values to apply to posture sensor data generated by the posture sensor when the at least one of sensor signal drift or sensor signal shift is determined to be present.