US 11,052,241 B2
Wearable cardioverter defibrillator (WCD) system measuring patient's respiration
Laura M. Gustavson, Redmond, WA (US); and Kenneth Frederick Cowan, Redmond, WA (US)
Assigned to WEST AFFUM HOLDINGS CORP., Grand Cayman (KY)
Filed by West Affum Holdings Corp., Grand Cayman (KY)
Filed on Oct. 25, 2017, as Appl. No. 15/792,860.
Claims priority of provisional application 62/417,147, filed on Nov. 3, 2016.
Prior Publication US 2018/0117299 A1, May 3, 2018
Int. Cl. A61N 1/04 (2006.01); A61B 5/00 (2006.01); A61B 5/0205 (2006.01); A61N 1/39 (2006.01); A61B 5/0295 (2006.01); A61B 5/024 (2006.01); A61B 5/316 (2021.01); A61B 5/318 (2021.01)
CPC A61N 1/046 (2013.01) [A61B 5/002 (2013.01); A61B 5/0205 (2013.01); A61N 1/3904 (2017.08); A61N 1/3925 (2013.01); A61B 5/0295 (2013.01); A61B 5/02405 (2013.01); A61B 5/316 (2021.01); A61B 5/318 (2021.01); A61N 1/0484 (2013.01); A61N 1/3968 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A wearable cardioverter defibrillator (WCD) system, comprising:
a support structure configured to be worn by a patient;
a power source;
an energy storage module configured to receive an electrical charge from the power source, and to store the received electrical charge;
a discharge circuit coupled to the energy storage module;
an impedance detector configured to render an impedance signal of the patient;
a transducer configured to render an electrocardiogram (ECG) signal of the patient;
a memory; and
a processor operatively coupled to the memory and configured to:
input the impedance signal,
determine, from the input impedance signal, a characteristic of breathing by the patient,
store a baseline value for the breathing characteristic in the memory,
determine a rate-of-change for the breathing characteristic based on a current value for the breathing characteristic and the baseline value for the breathing characteristic,
determine, from at least the rate-of-change of the breathing characteristic exceeding a threshold value, whether a breathing alert criterion is met,
perform a first rhythm analysis of the ECG signal to determine whether a shock criterion is met, the first rhythm analysis being performed in a first manner when the breathing alert criterion is met, the first manner being performed with a first set of analyses of the ECG signal,
perform a second rhythm analysis different than the first rhythm analysis when the breathing alert criterion is not met to determine whether the shock criterion is met, the second rhythm analysis being performed with the first set of analyses plus at least one more analysis that is not included in the first set of analyses, and
control, responsive to the shock criterion being met, the discharge circuit to discharge the stored electrical charge through the patient while the support structure is worn by the patient.