US 12,251,567 B2
Pacing mode switching and rate response limit in a ventricular pacemaker
Wade M. Demmer, Coon Rapids, MN (US); Juliana E. Pronovici, New Hope, MN (US); and Todd J. Sheldon, North Oaks, MN (US)
Assigned to Medtronic, Inc., Minneapolis, MN (US)
Filed by Medtronic, Inc., Minneapolis, MN (US)
Filed on Nov. 19, 2021, as Appl. No. 17/531,699.
Application 17/531,699 is a continuation of application No. 15/948,240, filed on Apr. 9, 2018, granted, now 11,185,701.
Prior Publication US 2022/0096837 A1, Mar. 31, 2022
Int. Cl. A61N 1/36 (2006.01); A61B 5/00 (2006.01); A61B 5/024 (2006.01); A61B 5/026 (2006.01); A61B 5/11 (2006.01); A61B 5/287 (2021.01); A61B 5/349 (2021.01); A61B 5/352 (2021.01); A61N 1/02 (2006.01); A61N 1/05 (2006.01); A61N 1/365 (2006.01); A61N 1/368 (2006.01); A61N 1/37 (2006.01); A61N 1/372 (2006.01); A61N 1/375 (2006.01)
CPC A61N 1/3688 (2013.01) [A61B 5/02444 (2013.01); A61B 5/026 (2013.01); A61B 5/1107 (2013.01); A61B 5/287 (2021.01); A61B 5/349 (2021.01); A61B 5/352 (2021.01); A61B 5/686 (2013.01); A61N 1/025 (2013.01); A61N 1/0573 (2013.01); A61N 1/36507 (2013.01); A61N 1/36578 (2013.01); A61N 1/36585 (2013.01); A61N 1/36592 (2013.01); A61N 1/3704 (2013.01); A61N 1/37211 (2013.01); A61N 1/3756 (2013.01); A61B 5/1118 (2013.01); A61N 1/36542 (2013.01); A61N 1/3682 (2013.01); A61N 1/37205 (2013.01); A61N 1/37288 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A medical device, comprising:
a pulse generator configured to deliver cardiac pacing pulses;
a motion sensor configured to produce a motion signal;
a sensing circuit configured to receive a cardiac electrical signal and sense R-waves from the cardiac electrical signal;
a control circuit coupled to the motion sensor, the sensing circuit, and the pulse generator, the control circuit configured to:
identify a ventricular systolic event as one of a ventricular pacing pulse delivered by the pulse generator or an R-wave sensed by the sensing circuit;
detect a ventricular passive filling event signal from the motion signal;
determine a time interval from the ventricular systolic event to the ventricular passive filling event; and
establish a minimum rate response pacing interval based on the time interval from the ventricular systolic event to the ventricular passive filling event, the minimum rate response pacing interval corresponding to a maximum pacing rate; and
a memory in communication with the control circuit and configured to store the minimum rate response pacing interval; and
the pulse generator is configured to deliver one or more pacing pulses at the maximum pacing rate.