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
Biodegradable aliphatic-aromatic copolyester for use in nonwoven webs
System and method for receiving MBMS broadcasting service
Washing machine
Device for maneuvering a vehicle using maneuvering moves using at least one trajectory
Memory device, test operation method thereof, and system including the same
Dynamic allocation of access channels based on access channel occupancy in a cellular wireless communication system
Integrated circuit packaging system with heat slug and method of manufacture thereof
  Randomly Featured Patents
Image forming apparatus
Flame-retardant poly(arylene ether) composition and its use as a covering for coated wire
Injection molding of fiber reinforced articles
Image reader with adjustable contrast range
Printer with cutter device
Magnetic resonance spectroscopic imaging with a variable repetition time in conjunction with a variable data acquisition time
Electrical connectors
Head-like pneumatic play ball
Benzotriazole derivatives and reagents for determining carboxylic acids thereof
Support sheath of wiper blade