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| Number | Title | Issue Date |
| 5312454 | Apparatus and method of automatically adjusting a sensor signal comparator threshold for an oxygen sensing pacemaker A monitoring system for an oxygen sensing, dual-wavelength, reflectance oximetry based, rate responsive cardiac pacemaker, is capable of automatically and continually adjusting an oxygen sensor signal comparator threshold such that the effects of noise, s... | 05/17/1994 |
| 5292342 | Low cost implantable medical device A low cost, limited-function implantable medical device. The device's synchronous circuits are driven by an ultra-slow master clock signal produced without utilization of a crystal oscillator. The device is non-invasively programmable by means of an exter... | 03/08/1994 |
| 5282839 | Rate responsive cardiac pacemaker and method for providing an optimized pacing rate which varies with a patient's physiologic demand A rate responsive cardiac pacemaker for providing an optimized pacing rate of stimulation pulses as a function of at least one selected rate control parameter. Each rate control parameter has a value which varies as a function of changes in a patient's ph... | 02/01/1994 |
| 5271395 | Method and apparatus for rate-responsive cardiac pacing A rate-responsive cardiac pacemaker comprising a minute ventilation circuit and an activity circuit. The minute ventilation circuit computes a first target pacing rate as a function of measurements of the patient's pleural blood impedance, and the activit... | 12/21/1993 |
| 5267150 | Input isolation circuit for computer-controlled medical device An apparatus for communicating an electrical signal from a first portion of circuitry to a second, wherein there is no direct electrical contact between the two portions. In one embodiment, an EKG transmitter is disclosed which receives surface EKG signal... | 11/30/1993 |
| 5243979 | Method and apparatus for implementing activity sensing in a pulse generator A cardiac pacemaker of the type including a sensor responsive to the patient's metabolic demand for oxygenated blood and which varies the pacing rate in response to the output of the sensor. In the disclosed embodiment, a piezoelectric sensor bonded to th... | 09/14/1993 |
| 5231986 | Method and system for optimizing activity threshold in activity based rate adaptive pacemakers A pacemaker capable of automatically adjusting the activity threshold setting of its activity sensor signal processing circuitry to its optimal value is disclosed. In one embodiment, the pacemaker maintains a running average of zero activity time and a cu... | 08/03/1993 |
| 5213098 | Post-extrasystolic potentiation stimulation with physiologic sensor feedback A post-extrasystolic potentiation (PESP) cardiac pacing energy stimulator for applying paired and/or triggered pacing stimulation pulses to the right atrium and/or ventricle incorporating one or more sensors, such as a venous oxygen saturation, ventricula... | 05/25/1993 |
