Patent ID: 11963779
Assignee: NEUROPACE, INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. An implantable medical device, comprising:
one or more electrodes configured to be implanted on or in a brain; and
a waveform analyzer configured to:
identify a half wave in an electrical signal sensed by the one or more electrodes;
determine an amplitude of the half wave and a duration of the half wave;
determine whether the identified half wave has a positive slope or a negative slope;
in a case of a positive-slope half wave, determine if the amplitude satisfies a positive-slope half wave amplitude criterion defined by a first set of amplitude parameters comprising a minimum amplitude and a maximum amplitude, and if the duration satisfies a positive-slope half wave duration criterion defined by a first set of duration parameters comprising a minimum duration and a maximum duration;
in a case of a negative-slope half wave, determine if the amplitude satisfies a negative-slope half wave amplitude criterion defined by a second set of amplitude parameters comprising a minimum amplitude and a maximum amplitude that is different from the first set of amplitude parameters, and if the duration satisfies a negative-slope half wave duration criterion defined by a second set of duration parameters comprising a minimum duration and a maximum duration that is different from the first set of duration parameters;
identify the half wave as a qualified half wave when each of the half wave amplitude criterion and the half wave duration criterion is satisfied;
determine, based on a count of a number of qualified half waves occurring within a time window and a half wave count criterion, whether the electrical signal includes electrographic activity indicative of epileptiform activity; and
output an event detection upon determining the electrical signal includes electrographic activity indicative of epileptiform activity; and

a stimulation subsystem coupled to the one or more electrodes and configured to receive the event detection from the waveform analyzer and to output an electrical stimulation to the one or more electrodes in response to the event detection.