Resources Contact Us Home
Microprocessor controlled rate-responsive pacemaker having automatic rate response threshold adjustment

Image Number 7 for United States Patent #5040534.

A 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.

  Recently Added Patents
Probe for ultrasound diagnostic apparatus
Visualization of information associated with applications in user interfaces
Method and system for checking citations
Systems and methods for minimization or elimination of diffusion effects in a microfluidic system
Organic electroluminescence element
System for wireless local area network (WLAN) transmission and for coexistence of WLAN and another type of wireless transmission and methods thereof
Apparatus and method for controlling a tunable matching network in a wireless network
  Randomly Featured Patents
Thin-film temperature sensor
Optical image reading device
Heat transfer plates evaporation and condensation apparatus
Light-emitting apparatus
Breather structure for internal combustion engine
Process for the preparation of phosphatidylserines
Method for stacking meat patties
Dimethylether recovery and/or recycle in an MTC conversion plant
Method for multilayer coating using pressure gradient regulation
Transporting device and image forming apparatus using the same