US 11,813,470 B2
Multi-axis coil for implantable medical device
Rajesh V. Iyer, Eden Prairie, MN (US); Gordon O. Munns, Stacy, MN (US); Christian S. Nielsen, River Falls, WI (US); Craig L. Schmidt, Eagan, MN (US); and Paul B. Young, New Richmond, WI (US)
Assigned to Medtronic, Inc., Minneapolis, MN (US)
Filed by Medtronic, Inc., Minneapolis, MN (US)
Filed on Sep. 21, 2020, as Appl. No. 17/027,013.
Application 17/027,013 is a continuation of application No. 16/021,059, filed on Jun. 28, 2018, granted, now 10,821,292.
Prior Publication US 2021/0001131 A1, Jan. 7, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. A61N 1/378 (2006.01); H02J 7/00 (2006.01); A61N 1/372 (2006.01); H01F 5/04 (2006.01); H01F 38/14 (2006.01); H01F 41/10 (2006.01); A61N 1/375 (2006.01); H01F 5/02 (2006.01)
CPC A61N 1/3787 (2013.01) [A61N 1/37229 (2013.01); H01F 5/04 (2013.01); H01F 38/14 (2013.01); H01F 41/10 (2013.01); H02J 7/0042 (2013.01); A61N 1/3756 (2013.01); A61N 1/37512 (2017.08); H01F 5/02 (2013.01)] 17 Claims
OG exemplary drawing
 
9. A medical device configured to be within a patient, the medical device comprising:
a rechargeable power source configured to provide electrical power to the medical device;
a multi-axis antenna comprising a plurality of coils encircling a ferrite core, the multi-axis antenna configured to generate a recharging current from one or more electrical currents induced into one or more of the plurality of coils when an externally generated magnetic field having a magnetic field direction is imposed onto the multi-axis antenna,
wherein the plurality of coils comprises a first coil having a first coil axis of orientation and formed from first electrically conductive winding, a second coil having a second coil axis of orientation and formed from a second electrically conductive winding, and a third coil having a third coil axis of orientation and formed from a third electrically conductive winding;
one or more diodes coupled to one or more of the plurality of coils and configured to prevent the one or more electrical currents induced into the one or more of the plurality of coils from being backward driven into another of the one or more of the plurality of coils;
recharging circuitry coupled to the multi-axis antenna and to the rechargeable power source, the recharging circuitry configured to direct a sum of the one or more electrical currents induced in one or more of the plurality of coils into the rechargeable power source; and
a switching device, coupled to the recharging circuitry and the multi-axis antenna, the switching device configured to switch the sum of the one or more electrical currents between the rechargeable power source and a shunt device, the shunt device comprising an electrically resistive load.