Patent ID: 11865351
Assignee: PHYSIO-CONTROL, INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 3:
4. A medical device comprising:
a measurement circuit configured to:
detect a first electrocardiogram (ECG) signal of an individual, the first ECG signal being detected during a first time interval and corresponding to a first ECG channel, and
detect a second ECG signal of the individual, the second ECG signal being detected during the first time interval and corresponding to a second ECG channel, and
detect a third ECG signal of the individual, the third ECG signal being detected during a second time interval and corresponding to the first ECG channel;

first conductors configured to receive a first voltage corresponding to the first ECG channel;
second conductors configured to receive a second voltage corresponding to the second ECG channel;
a first switch connected to the first conductors and to the measurement circuit;
a second switch connected to the second conductors and to the measurement circuit;
a discharge circuit configured to output an electrical shock to the individual; and
a processor configured to:
compare the first ECG signal and the second ECG signal in accordance with a selection criterion;
in response to comparing the first ECG signal and the second ECG signal, select the first ECG channel;
in response to selecting the first ECG channel, open the second switch, thereby disconnecting the second conductors from the measurement circuit;
in response to selecting the first ECG channel, determine that the third ECG signal comprises ventricular fibrillation (VF) or ventricular tachycardia (VT); and
cause the discharge circuit to output the electrical shock to the individual in response to determining that the third ECG signal comprises VF or VT.