Cardiac Pacing Vector Control via Sensor Feedback
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Solution Overview
Problem
Current cardiac pacing systems face challenges in dynamically adjusting pacing characteristics, such as pacing vector and energy delivery, to effectively manage heart rhythms and patient comfort, particularly in response to changes in posture and skeletal muscle activity.
Innovation Solution
A cardiac pacing system that includes a pulse generator, leads with electrodes, and sensors to monitor physiological characteristics, using a controller to determine and modify pacing vectors and characteristics based on signals from sensors, such as accelerometers and electrodes, to optimize pacing delivery and patient comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pacing characteristics are fixed, then device complexity is reduced, but adaptability to different postures and muscle activities deteriorates
Solution Approach 1:
The pacemaker dynamically adjusts pacing characteristics (vector, energy, timing) based on real-time sensor feedback about posture and skeletal muscle activity, transitioning from a static fixed-parameter system to a dynamic adaptive system that responds to changing physiological conditions
Solution Approach 2:
The system incorporates sensors that continuously monitor physiological parameters and feed this information back to the controller, which then modifies pacing delivery accordingly. This closed-loop feedback mechanism enables automatic adaptation without increasing operational complexity for the patient
2Reliability
If pacing energy is increased, then heart rhythm management effectiveness is improved, but patient comfort deteriorates due to skeletal muscle stimulation
Solution Approach 1:
The system selectively directs pacing energy to specific cardiac regions using optimized pacing vectors, concentrating therapeutic effect where needed while minimizing spread to surrounding skeletal muscle tissue. This spatial selectivity allows high energy delivery to the heart without proportionally increasing muscle stimulation
Solution Approach 2:
The pacemaker dynamically adjusts pacing vector and energy levels based on real-time detection of skeletal muscle activity through sensors. When muscle stimulation is detected, the system automatically modifies pacing parameters to reduce harmful effects while maintaining cardiac therapy effectiveness
3Measurement precision
If multiple sensors are added, then measurement precision of physiological characteristics is improved, but device complexity increases
Solution Approach 1:
The system uses a multi-functional sensor array where each sensor serves multiple purposes: accelerometers detect both posture changes and skeletal muscle activity, and housing electrodes function as both pacing electrodes and sensing electrodes. This multi-functionality reduces the need for separate dedicated sensors for each measurement type
Data Source
AI summary
A cardiac pacing system having a pulse generator for generating therapeutic electric pulses, a lead electrically coupled with the pulse generator having an electrode, a first sensor configured to monitor a physiological characteristic of a patient, a second sensor configured to monitor a second physiological characteristic of a patient and a controller. The controller can determine a pacing vector based on variables including a signal received from the second sensor, and cause the pulse generator to deliver the therapeutic electrical pulses according to the determined pacing vector. The controller can also modify pacing characteristics based on variables including a signal received from the second sensor.