Joel C Anderson

US Patent:

8271089, Sep 18, 2012

Filed:

Apr 3, 2009

Appl. No.:

12/418291

Inventors:

David A. Dinsmoor - St. Paul MN, US
Todd A. Kallmyer - Tempe AZ, US
Joel A. Anderson - Brooklyn Park MN, US
Timothy J. Denison - Minneapolis MN, US

Assignee:

Medtronic, Inc. - Minneapolis MN

International Classification:

A61N 1/378

US Classification:

607 33, 607 34, 607 61

Abstract:

A charging system is disclosed. In one embodiment, the system includes a charging unit having a primary coil, and an implantable medical device comprising a secondary coil to receive charge from the primary coil. The implantable medical device further includes a half-wave voltage-doubling rectifier coupled to the secondary coil, a full-wave rectifier coupled to the secondary coil, and a rechargeable power source. Control logic is provided to periodically configure the rechargeable power source to receive charge from a selected one of the voltage-doubling circuit and the full-wave rectifier in a manner that increases rate at which charge is transferred from the secondary coil to the rechargeable power source. The control logic may configure the rechargeable power source to receive charge based on one or more monitored conditions which may include, for example, an indication of a current, a voltage, a coupling coefficient, back-scatter, and temperature.