Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Rate responsive cardiac pacemaker










Image Number 13 for United States Patent #5031615.

An implantable activity-based cardiac pacemaker has a variable rate stimulus generator housed together with an accelermeter and associated circuitry within a case. The accelerometer is isolated from the case to detect forces of acceleration on the case while avoiding response to pressure on the case, and to generate an electrical signal representative of the magnitude of the accelerational forces. The accelerometer is integrated into hybrid electronic circuitry, such as a semiconductor chip, together with an electrical circuit which processes the signal generated by the accelerometer to vary the rate of the stimulus generator according to the magnitude of the signal. Either the accelerometer is configured as a mechanoelectrical transducer having a natural frequency response characteristic limited to a range below 4 Hz, or the electrical circuit itself includes an electrical filter having such a frequency response characteristic, so that the pacemaker is capable of distinguishing accelerational forces indicative of true physical exercise of the patient in whom the pacemaker is implanted.








 
 
  Recently Added Patents
Semiconductor IC including pulse generation logic circuit
Systems and methods for determining muscle force through dynamic gain optimization of a muscle PID controller for designing a replacement prosthetic joint
Pausing a VoiceXML dialog of a multimodal application
Managing aging of silicon in an integrated circuit device
Methods, systems, and products for providing ring backs
Transcoded images for improved trick play
Single-stage PFC converter with constant voltage and constant current
  Randomly Featured Patents
Process for displaying broadcast and recorded transmissions possessing a common characteristic and associated receiver
Snap guide for a hand held optical scanner
Transaction management device and readable storage medium
Menu-driven remote control transmitter
Microfluidic device with thin-film electronic devices
Weighing or counting method with some unfilled hoppers
System and method of controlling automatic transmission
Expandable circuit carrier
Relay connection management program, relay connection management method, relay connection management apparatus and recording medium which stores relay connection management program
Methods of forming capacitors