Cardiac Pacing Signal Validation for Ventricular Oversensing
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Solution Overview
Problem
Existing medical devices face challenges in accurately distinguishing between valid and invalid ventricular event signals, leading to potential misdelivery of cardiac pacing pulses.
Innovation Solution
A medical device that senses cardiac electrical signals from an extracardiac location, uses a validation window to confirm the validity of ventricular event signals based on morphology features and alternating intervals, and adjusts pacing escape intervals accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a medical device senses ventricular event signals from extracardiac electrodes to trigger cardiac pacing, then pacing therapy can be delivered, but the device may incorrectly sense invalid signals (oversensing) leading to unnecessary pacing pulse delivery
Solution Approach 1:
The patent applies preliminary action by implementing a validation window that opens before the expected arrival time of a genuine ventricular signal. This allows the device to prepare validation criteria in advance and quickly determine whether a sensed signal is valid before committing to pacing pulse delivery, thereby improving reliability without excessive complexity
Solution Approach 2:
The patent uses feedback by analyzing characteristics of the sensed signal such as amplitude, morphology, and timing relative to the validation window to determine signal validity. This feedback mechanism allows the device to distinguish valid ventricular events from invalid oversensing, improving pacing accuracy while maintaining manageable system complexity
2Measurement precision
If the device uses a validation window and multiple signal characteristics to verify ventricular events, then the accuracy of pacing trigger determination is improved, but the processing time and complexity increase
Solution Approach 1:
By establishing the validation window in advance based on expected signal timing, the device performs preliminary preparation for validation. This allows rapid assessment of signal characteristics when they arrive, achieving high measurement precision without excessive processing time delays
Solution Approach 2:
The patent changes parameters such as the timing and duration of the validation window based on expected physiological intervals. This allows the system to optimize the balance between validation precision and processing speed by adjusting temporal parameters to match anticipated signal arrival patterns
3Productivity
If the device delivers pacing pulses in response to sensed ventricular events, then cardiac rhythm management is provided, but invalid signal sensing may cause inappropriate pacing pulse delivery
Solution Approach 1:
The device uses feedback by continuously monitoring signal characteristics and comparing them against validation criteria before triggering pacing. This feedback loop ensures that pacing pulses are delivered only in response to valid ventricular events, maintaining therapeutic efficacy while preventing harmful unnecessary pacing from invalid signals
Solution Approach 2:
The validation window and signal analysis mechanisms act as intermediaries between signal sensing and pacing delivery. This intermediary layer filters out invalid signals before they can trigger inappropriate pacing, thereby eliminating harmful effects while preserving necessary therapeutic pacing
Data Source
AI summary
A medical device is configured to receive cardiac electrical signals and sense ventricular event signals from the cardiac electrical signals. The medical device may start a validation window in response to sensing a ventricular event signal and determine if the ventricular event signal is a valid event signal or an invalid event signal based on processing of a different cardiac electrical signal than the cardiac electrical signal from which the ventricular event signal was sensed.