Resources Contact Us Home
Rate adaptive demand pacemaker

Image Number 4 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
Comparison of visual information
System and method of creating and providing SMS http tagging
Nutritional supplement method
Image browsing device, computer control method and information recording medium
Crystalline form of zofenopril calcium
Representing polarized light in computer models
Method and system for modifying satellite radio program subscriptions in a mobile vehicle
  Randomly Featured Patents
Scanning exposure method and apparatus
Coating composition
Storage rack with overhead loading and unloading
Cam operated switch assembly
Method and apparatus for the generation and control of multiple near-field light sources at subwavelength resolution
Parallel electron beam lithography stamp (PEBLS)
Ether diamines quaternaries
Method of manufacturing a device worn by an animal
Apparatus for fluidized, vacuum drying and gas treatment for powdered, granular, or flaked material
Film camera