Closed loop charger for an implantable medical device system employing reflected impedance modulation
US9314642B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 2012 |
| Grant date | Apr 19, 2016 |
| Priority date | — |
| Expiry date | May 20, 2033 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/3787
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The disclosed system for providing closed loop charging between an external charger and an implantable medical device such as an IPG involves the use of reflected impedance modulation, i.e., by measuring at the external charger reflections arising from modulating the impedance of the charging coil in the IPG. During charging, the charging coil in the IPG is periodically pulsed to modulate its impedance. The magnitude of the change in the coil voltage produced at the external charger ΔV as a result of these pulses is assessed and is used by the controller circuitry in the external charger as indicative of the coupling between the external charger and the IPG. The external charger adjusts its output power (e.g., Icharge) in accordance with the magnitude of ΔV, thus achieving closed loop charging without the need of telemetering coupling parameters from the IPG.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.