Leadless Pacemaker Dynamic Energy Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cardiac pacemakers face challenges in efficiently managing pacing pulse energy to ensure effective heart capture while minimizing energy consumption, as existing devices often operate at fixed energy levels, leading to either unnecessary energy expenditure or failure to capture the heart.
Innovation Solution
A system comprising a leadless cardiac pacemaker (LCP) and a second medical device with capture threshold capability, where the second device monitors heart activity and adjusts the pacing energy level of the LCP by increasing or decreasing the energy of subsequent pulses until optimal capture is achieved, thereby determining and maintaining the current capture threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed energy level pacing is used, then device operation is simple, but energy efficiency is poor and capture reliability is compromised
Solution Approach 1:
The patent implements dynamic pacing energy adjustment by transitioning from fixed energy levels to variable energy levels that adapt in real-time. The system dynamically modifies pacing pulse energy based on capture threshold assessments, allowing the pacemaker to optimize energy delivery continuously rather than operating at a static setting.
Solution Approach 2:
The patent employs feedback mechanisms where the pacemaker monitors cardiac response to pacing pulses and uses this information to adjust subsequent pulse energy. The system assesses whether each pace pulse successfully captured the heart and modifies energy delivery based on this feedback, creating a closed-loop control system that improves both reliability and efficiency.
2Reliability
If higher pacing energy is delivered, then heart capture is more reliable, but energy consumption increases reducing device lifetime
Solution Approach 1:
The patent changes the energy parameter of pacing pulses from fixed to variable levels. By adjusting the energy parameter dynamically based on assessed capture thresholds, the system delivers the minimum necessary energy for reliable capture rather than consistently using higher energy levels, thereby extending device lifetime while maintaining capture reliability.
Solution Approach 2:
The patent avoids excessive energy delivery by delivering only the partial energy necessary for capture. The system determines capture thresholds and delivers pacing pulses at or near this threshold level rather than using excessive energy, optimizing the balance between capture reliability and energy conservation for extended device operation.
3Use of energy by moving object
If capture threshold monitoring is implemented, then pacing energy optimization is achieved, but device complexity increases
Solution Approach 1:
The patent makes the pacemaker device multi-functional by combining pacing delivery with capture threshold monitoring and assessment capabilities. The same device that delivers pacing pulses also monitors cardiac response and adjusts energy levels, eliminating the need for separate monitoring devices and managing complexity through functional integration.
Solution Approach 2:
The pacemaker system performs self-assessment and self-adjustment of pacing energy levels. The device monitors its own pacing effectiveness and automatically modifies its operation without external intervention, enabling energy optimization while keeping the control system integrated within the single device rather than requiring external complexity.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A medical system may include a first medical device such as a leadless cardiac pacemaker (LCP) that is configured to pace a patient's heart and a second medical device that is configured to have a capture threshold capability. The second medical device may monitor the patient's heart to ascertain whether the pacing pulses from the first medical device are capturing the heart, and to send the first medical device instructions to alter an energy level of subsequent pacing pulses.