US 10,888,238 B2
Automatic determination and selection of filtering in a cardiac rhythm management device
Venugopal Allavatam, Saratoga, CA (US); Stephen J. Hahn, Shoreview, MN (US); Keith L. Herrmann, Minneapolis, MN (US); Mitchell D. Lanz, Maple Grove, MN (US); Krzysztof Z. Siejko, Maple Grove, MN (US); and Benjamin Speakman, Eagan, MN (US)
Assigned to CARDIAC PACEMAKERS, INC., St. Paul, MN (US)
Filed by CARDIAC PACEMAKERS, INC., St. Paul, MN (US)
Filed on Nov. 1, 2018, as Appl. No. 16/177,884.
Application 16/177,884 is a continuation of application No. 15/362,862, filed on Nov. 29, 2016, granted, now 10,149,627.
Claims priority of provisional application 62/262,043, filed on Dec. 2, 2015.
Prior Publication US 2019/0069793 A1, Mar. 7, 2019
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 5/0402 (2006.01); A61B 5/0452 (2006.01); A61N 1/39 (2006.01); A61N 1/37 (2006.01); A61N 1/362 (2006.01); A61B 5/00 (2006.01); A61B 5/0456 (2006.01); A61B 5/0428 (2006.01); A61B 5/042 (2006.01); A61B 5/04 (2006.01)
CPC A61B 5/04017 (2013.01) [A61B 5/04012 (2013.01); A61B 5/0422 (2013.01); A61B 5/0428 (2013.01); A61B 5/0452 (2013.01); A61B 5/0456 (2013.01); A61B 5/04288 (2013.01); A61B 5/725 (2013.01); A61N 1/3627 (2013.01); A61N 1/3702 (2013.01); A61N 1/3925 (2013.01); A61N 1/3956 (2013.01); A61B 5/7282 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A cardiac rhythm management device comprising plural sensing electrodes for capturing a cardiac signal and operational circuitry coupled to the plural sensing electrodes for analyzing the cardiac signal, the operational circuitry configured with a selectable filtering mode allowing filtering of the captured cardiac signal according to a first approach and a second approach, the second approach applying an additional high pass filter relative to the first approach, wherein the operational circuitry is configured to operate using the selectable filtering mode as follows:
determining whether to select the first approach or the second approach by measuring a first amplitude of the captured cardiac signal, post filtering via the first approach, and comparing the first amplitude to a first threshold and:
if the first amplitude exceeds the first threshold, enabling the second approach for use in cardiac signal analysis; or
if the first amplitude does not exceed the first threshold, disabling the second approach for use in cardiac signal analysis; and
detecting cardiac cycles by comparing a received cardiac signal, as filtered by one of the first or second approaches, to a detection threshold and declaring a new cardiac cycle when the received cardiac signal exceeds the detection threshold;
wherein the first amplitude is an average signal strength of the captured signal.