US 12,005,259 B2
Dual sensors to control pacing rate
Hyun J. Yoon, Vadnais Heights, MN (US); Vincent P. Ganion, Blaine, MN (US); Yanina Grinberg, Plymouth, MN (US); Saul E. Greenhut, Denver, CO (US); Todd J. Sheldon, North Oaks, MN (US); Paul R. Solheim, Blaine, MN (US); and Eric R. Williams, Maple Grove, MN (US)
Assigned to Medtronic, Inc., Minneapolis, MN (US)
Filed by Medtronic, Inc., Minneapolis, MN (US)
Filed on Aug. 17, 2021, as Appl. No. 17/404,517.
Claims priority of provisional application 63/076,420, filed on Sep. 10, 2020.
Prior Publication US 2022/0072316 A1, Mar. 10, 2022
Int. Cl. A61N 1/365 (2006.01); A61N 1/362 (2006.01)
CPC A61N 1/36542 (2013.01) [A61N 1/3622 (2013.01); A61N 1/3624 (2013.01); A61N 1/3655 (2013.01)] 25 Claims
OG exemplary drawing
 
1. A medical device comprising:
an accelerometer configured to generate an acceleration signal;
a temperature sensor configured to generate a temperature signal;
a therapy delivery circuit configured to deliver cardiac pacing pulses at a pacing rate;
a memory configured to store a transfer function that relates an activity metric to a target cardiac pacing rate, the transfer function being defined by at least one slope and at least one set point; and
a control circuit configured to:
receive the acceleration signal and the temperature signal;
determine a first activity metric representative of patient physical activity from the acceleration signal;
determine from the acceleration signal a second activity metric representative of patient physical activity at a time later than the first activity metric;
determine the target cardiac pacing rate based on the second activity metric according to the transfer function;
determine that the second activity metric is equal to or greater than the first activity metric;
determine a temperature change from the temperature signal; and
in response to the second activity metric being equal to or greater than the first activity metric, determine an adjusted target cardiac pacing rate by:
adjusting the transfer function by adjusting at least one of the at least one slope or the least one set point based on the temperature change; and
determining the adjusted target cardiac pacing rate based on the second activity metric according to the adjusted transfer function; and
adjust the pacing rate according to the adjusted target cardiac pacing rate.