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Improved Alignment Method for Inductive Charging Using Permanent Magnets

IP.com Disclosure Number: IPCOM000220212D
Publication Date: 2012-Jul-25
Document File: 1 page(s) / 30K

Publishing Venue

The IP.com Prior Art Database

Abstract

Neurostimulators, including but not limited to spinal cord stimulators (SCS) to treat chronic pain, can be powered by a rechargeable power source. One method commonly used to transfer energy to the Implantable Pulse Generators (IPG) is through inductive charging. The IPG and the external charging system both contain a coil used to magnetically couple the energy. To optimize charging efficiency, it is critical that the coils are in close proximity and well aligned, especially for systems that use small, handheld external charging systems.

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Improved Alignment Method for Inductive Charging Using Permanent Magnets

Neurostimulators, including but not limited to spinal cord stimulators (SCS) to treat chronic pain, can be powered by a rechargeable power source. One method commonly used to transfer energy to the Implantable Pulse Generators (IPG) is through inductive charging. The IPG and the external charging system both contain a coil used to magnetically couple the energy. To optimize charging efficiency, it is critical that the coils are in close proximity and well aligned, especially for systems that use small, handheld external charging systems.

The most commonly used alignment method is closed loop charging. Closed loop charging requires

the charging system to periodically interrupt the charging field to communicate with the IPG to monitor the charge rate. This method typically provides relatively slow response time (on the order of several seconds) and is relatively complex, requiring development of communication protocol, error detection scheme, etc. In addition, sub-optimal alignment results in inefficient charging that can lead to excessive heating of both the IPG and external charger.

This idea provides a simple, precise and fast method for alignment using permanent magnets.

By placing a permanent magnet in both the IPG and External Charger to make use of the strong attractive magnetic force, efficient and precise coupling of the primary (external charger) and secondary (IPG) inductive charging coils can...