Patent ID: 9597513
Date: 2017-03-21
CPC Classifications: A61B,A61N

Claim:
1. A method performed by an implantable medical device, comprising: filtering a raw cardiac electrical signal received by implanted electrodes operably connected to a sensing module within the medical device according to first filtering properties to produce a filtered cardiac electrical signal, the raw cardiac electrical signal comprising first cardiac events, second cardiac events different than the first cardiac events, and third cardiac events different than the first cardiac events and the second cardiac events; detecting a first crossing of a first threshold by the filtered cardiac electrical signal; identifying one of the second cardiac events after the first crossing; detecting a second crossing of the first threshold by the filtered cardiac electrical signal after the identified one of the second cardiac events; analyzing the first crossing and the second crossing of the filtered cardiac electrical signal; establishing cardiac event sensing criteria that discriminate the first cardiac events from the third cardiac events based on the analyzing of the first crossing and the second crossing; and sensing the first cardiac events from the filtered cardiac electrical signal when the established cardiac event sensing criteria are met.