Resources Contact Us Home
Rate adaptive demand pacemaker

Image Number 3 for United States Patent #4467807.

An implantable pacer having an effective stimulation rate which varies in response to a measured physiological parameter. Changes in the parameter to be measured must be related to physiologically required changes in heart rate. The level of oxygen within intracardiac or pulmonary artery venous blood is the preferred parameter. This parameter is measured by an oxygen sensor located on a transvenously implanted lead. As with normal demand pacers, a sensing electrode, also located on the lead, provides the pacer with an indication of whether a pacing pulse must be generated. The measured physiological parameter determines the escape interval for demand pacing. As such, a given minimum rate is determined for a given level of molecular oxygen in the intracardiac or pulmonary artery venous blood. The technique is readily employed in both ventricular and atrial-ventricular sequential modes.

  Recently Added Patents
Phosphoinositide 3-kinase inhibitor with a zinc binding moiety
Adaptive period network session reservation
Image processing apparatus, image forming system, and computer-readable storage medium
Single-stage PFC converter with constant voltage and constant current
High pressure refolding of protein aggregates and inclusion bodies
High density molecular memory storage with read and write capabilities
Embedded bonding pad for image sensors
  Randomly Featured Patents
Apparatus and method for cooling semiconductor devices
Turbo-molecular pump
Fishing reel
Blending communications in a call center
Process for discriminating the color of a surface and apparatus for implementing the process
Nail polish removal devices having supply containers
Substituted 2-anilinopyrimidines useful as protein kinase inhibitors
Workpiece handling system for vacuum processing
Determination of genomic sex in salmonids
Optoelectronic system for measuring electric or magnetic quantities utilizing a dual light beam of different wavelengths