Implant Charging Coil Selection for Migration and Rotation
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Solution Overview
Problem
Implantable medical devices face reduced recharge efficiency due to migration and rotation, which alter the orientation and depth of the device relative to the charging coils, leading to suboptimal magnetic field alignment and reduced charging effectiveness.
Innovation Solution
The implementation of a system with a plurality of charging coils connected via a switch matrix and a processor that dynamically selects subsets of coils based on received charge current, threshold, and hysteresis levels, allowing for variable depth and orientation adjustments to maintain efficient charging, even as the device migrates or rotates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single charging coil is used, then the device structure is simple, but the recharge efficiency decreases when the implantable device migrates or rotates
Solution Approach 1:
The charging system is divided into multiple independent charging coils arranged in different spatial orientations. Each coil can be independently controlled and activated based on the detected position and orientation of the implantable device, allowing the system to segment the charging function across multiple coils to maintain efficiency despite device migration or rotation.
Solution Approach 2:
The system dynamically selects and activates appropriate charging coils based on real-time detection of the implantable device's depth and angle of orientation. This dynamic adaptation allows the charging system to maintain optimal alignment with the implantable device's receiving coil even as it migrates or rotates within the patient's body.
2Productivity
If multiple charging coils are used, then the recharge efficiency is maintained during device migration, but the device complexity increases
Solution Approach 1:
The system dynamically selects and activates appropriate charging coils based on real-time detection of the implantable device's depth and angle of orientation. This dynamic adaptation allows the charging system to maintain optimal alignment with the implantable device's receiving coil even as it migrates or rotates within the patient's body.
Solution Approach 2:
Different charging coils are positioned to target specific spatial zones and orientations. The system activates only the coil or coils that are currently best aligned with the implantable device, providing localized charging capability that adapts to the device's position while avoiding the need to maintain all coils at full complexity.
3Device complexity
If the charging coil is fixed, then the structure is simple, but the magnetic field alignment becomes suboptimal when the implantable device changes orientation
Solution Approach 1:
The system dynamically selects and activates appropriate charging coils based on real-time detection of the implantable device's depth and angle of orientation. This dynamic adaptation allows the charging system to maintain optimal alignment with the implantable device's receiving coil even as it migrates or rotates within the patient's body.
Solution Approach 2:
The system detects the depth and angle of orientation of the implantable device and uses this feedback information to determine which charging coils to activate. This closed-loop feedback mechanism ensures that the magnetic field alignment remains optimal despite changes in the implantable device's position or orientation.
4Loss of time
If high power is used for recharging, then the recharging time decreases, but the localized heating increases
Solution Approach 1:
The charging power is segmented across multiple coils rather than concentrated in a single coil. By distributing the high power requirement across multiple independently controlled coils, the system can achieve fast recharging while reducing the power density and associated localized heating at any single location.
Solution Approach 2:
The system can periodically switch between different charging coils during the recharging process. This periodic action allows high power to be applied in alternating intervals to different coils, achieving fast overall recharging while allowing each individual coil location to cool between high-power intervals, thereby reducing localized heating.
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
This approach enhances recharge efficiency by maintaining optimal magnetic field alignment, reducing recharging time, and minimizing localized heating, thereby extending the operational life of the implantable device without requiring physical movement of the charging device.
Implementation Method 1
a first subset of the charging coils associated with a first charging zone are powered, creating a corresponding magnetic field
Data Source
AI summary
The instant application relates to inductive charging of devices subject to migration. Embodiments described herein provide charging to devices at variable depths and locations to accommodate both net displacement of an implantable device as well as angular rotation of the implantable device by selecting appropriate sets or subsets of available field generation coils.