Wirelessly Powered Leadless Pacemaker Power Management
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Solution Overview
Problem
Current leadless pacemakers face challenges in synchronization and efficient power transfer, as they require immediate power for stimulation, leading to inefficiencies and limited lifespan due to battery constraints, making it difficult to control multiple devices simultaneously.
Innovation Solution
The development of wirelessly powered leadless pacemakers (WPLPs) that use wireless power transfer methodologies to store power over a longer period, allowing for efficient synchronization and control of multiple devices using electromagnetic and magnetic fields of different frequencies, enabling flexible implantation positions and therapies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If leadless pacemakers use immediate wireless power transfer for stimulation, then stimulation responsiveness is improved, but energy efficiency deteriorates and device lifespan is limited
Solution Approach 1:
The system performs preliminary power transfer during intervals between heartbeats to charge energy storage capacitors in advance. This allows the pacemaker to have energy readily available for immediate stimulation when needed, without requiring continuous high-power wireless power transfer. The energy is harvested and stored beforehand, resolving the contradiction between fast responsiveness and energy efficiency.
2Adaptability or versatility
If multiple leadless pacemakers are implanted simultaneously, then treatment versatility is improved, but synchronization control becomes difficult
Solution Approach 1:
The wireless power transfer system serves multiple functions simultaneously: it provides power to all pacemakers, carries control signals for synchronization, and enables communication between devices. By using the same wireless channel for multiple purposes, the system avoids the complexity of separate control wiring or communication protocols for each device, making multi-device synchronization manageable.
Solution Approach 2:
The controller acts as an intermediary that coordinates power transfer signals to multiple pacemakers using different frequencies. The controller manages the timing and frequency allocation to ensure synchronized operation of multiple devices without interference, simplifying the control architecture compared to direct peer-to-peer coordination between pacemakers.
3Power
If wireless power transfer uses high power for immediate stimulation, then stimulation effectiveness is improved, but power transfer efficiency deteriorates
Solution Approach 1:
The system uses periodic wireless power transfer during intervals between heartbeats rather than continuous high-power transfer. Energy is accumulated in storage capacitors during these low-power intervals, then discharged quickly for stimulation. This periodic approach maintains high stimulation effectiveness while dramatically improving overall power transfer efficiency by avoiding continuous high-power transmission.
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
WPLPs enable efficient and synchronized heart stimulation, extending the lifespan of pacemakers and allowing for flexible treatment configurations, improving energy efficiency and ease of use by storing power between heartbeats and modulating signals for precise control.
Implementation Method 1
An example of a nonradiative technique is electromagnetic induction or near-field coupling, where by power is transferred via magnetic fields by inductive coupling (resonant or non-resonant) between coils of wire
Implementation Method 2
An example of a nonradiative technique is electromagnetic induction or near-field coupling, where by power is transferred via magnetic fields by inductive coupling (resonant or non-resonant) between coils of wire or via electric fields by capacitive coupling between metal electrodes
Implementation Method 3
the first energy harvesting circuitry stores power received via the wireless power receiver in at least one capacitor
Implementation Method 4
when not receiving the first power transfer signal, the first stimulation circuitry discharges the stored power via the first stimulation electrode
Data Source
AI summary
Systems and methods for heart stimulation in accordance with embodiments of the invention are illustrated. One embodiment includes a heart stimulation system, including a first wirelessly powered, leadless pacemaker, including a wireless power receiver tuned to a first frequency, an energy harvesting circuitry, a stimulation circuitry, and a stimulation electrode, a controller, including a wireless power signal generator, a wireless power transmitter tuned to the frequency, a processor, and a memory containing a stimulation control application, where the stimulation control application directs the processor to generate a power transfer signal using the first wireless power signal generator, and transmit the power transfer signal using the wireless power transmitter, wherein the wirelessly powered, leadless pacemaker receives the power transfer signal using the first wireless power receiver, and when receiving the power transfer signal, the energy harvesting circuitry stores power received via the wireless power receiver in at least one capacitor.