Patent ID: 7206635
Filing Date: 2007-04-17
Classification: A61N

Abstract:
1. An implantable medical device capable of being implanted in a patient, comprising: a therapy component configured to provide a therapy to the patient; sensing circuitry sensing a physiologic parameter corresponding to minute ventilation values indicative of a minute ventilation of the patient; and a microprocessor coupled to the therapy component and the sensing circuitry to detect onset of a first state of the patient in response to the sensed physiologic parameter, and to determine whether the onset of the first state is detected for a first predetermined time period, wherein the first state corresponds to an asleep state, and wherein the microprocessor receives a plurality of the minute ventilation values at predetermined time intervals over a period of time to generate a first distribution rate of minute ventilation values of the plurality of minute ventilation values received during first time intervals m of the predetermined time intervals, including a current time interval and first preceding time intervals m-1, and a second distribution rate of minute ventilation values received during second time intervals n of the predetermined time intervals, including the current time interval and second preceding time intervals n1, wherein the onset of the first state is detected in response to the second distribution rate being greater than the first distribution rate.