Patent ID: 6990372

Claim:
A signal analysis device for use within an implantable device, wherein said implantable device is configured at least in art for sensing a biological signal within a patient's body, said signal analysis device comprising: a sealed elongate housing having an axial dimension of less than 60 mm and a lateral dimension of less than 6 mm; sensing circuitry contained within said sealed elongate housing for receiving a biological signal within said implantable device and generating a sensed voltage output in response thereto; event detection circuit contained within said sealed elongate housing for detecting an attribute of said sensed output according to one or more designated criteria and designating said detected attribute as an event, wherein said event detection circuit is alternatively configurable for determining whether an event occurred according to one or according to two or more programmable criteria; an event counter contained within said sealed elongate housing configured for accumulating detected events; a clock counter contained within said sealed elongate housing for accumulating clock pulses; event analysis circuitry contained within said sealed elongate housing for determining a processed value corresponding to said detected events and said accumulated clock pulses; and wherein said programmable criteria include at least first and second threshold levels and is further alternatively configurable to determine an event when: said sensed voltage output increases above said first threshold level and then decreases below said first threshold level; or said sensed voltage output increases above said first threshold level and then decreases below said first threshold level without exceeding said second threshold level.