Microprocessor controlled rate-responsive pacemaker having automatic rate response threshold adjustment
January 25, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References Re30366 3659615 3777762 Digital means for non-invasively controlling the parameters of an implantable heart pacer Cardiac pace-maker Acoustic signalling apparatus for implantable devices Implantable dynamic pressure transducer system Method and apparatus for setting and changing parameters or functions of an implanted device Microprocessor controlled cardiac pacemaker and method for avoiding pacer sustained tachycardia Dual chamber pacemaker with automatic high rate limit mode determination InventorsAssigneeApplicationNo. 301934 filed on 01/25/1989US Classes:607/17, Parameter control in response to sensed physiological load on heart607/19, Physical activity607/30, Remotely changing, (e.g., programming, pacer) parameters or operation607/36Feature of stimulator housing or encapsulationExaminersPrimary: Jaworski, Francis J.Assistant: Manuel, George Attorney, Agent or FirmInternational ClassA61N 001/00AbstractA rate-responsive pacemaker which includes a conventional programmable pulse generator, a physiological sensor, and a processor is disclosed which generates heart stimulation pulses on demand, or as otherwise programmed, as controlled by a rate control signal which is derived from the physiological sensor. The physiological sensor generates a raw signal which varies as a function of some physiological parameter, such as activity level to provide some indication of whether the heart rate should increase or decrease, and hence whether the pacemaker should change the rate at which pacing pulses are provided. The processor converts the raw signal to the sensor-indicated rate signal in accordance with a selectable transfer relationship which defines the sensor-indicated rate signal as a function of a set of discrete sensor level index signals. The sensor-indicated rate signal remains at a minimum value or base rate for all sensor level index signals below a prescribed rate response threshold, with this rate response threshold being set automatically by the processor as a function of a running average of the sensor level index signals monitored over a prescribed time period.Other References
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