×

Method and apparatus for noninvasive monitoring dynamic cardiac performance

  • US 4,993,420 A
  • Filed: 03/30/1990
  • Issued: 02/19/1991
  • Est. Priority Date: 03/30/1990
  • Status: Expired due to Term
First Claim
Patent Images

1. Apparatus for noninvasively monitoring dynamic cardiac output and cardiovascular system parameters of a living subject comprising, means for sensing a carotid pulse waveform above the carotid artery externally on the body of the living subject and for converting the sensed pulse waveform to a carotid pressure electrical waveform and means for sensing a femoral pulse waveform above the femoral artery externally on the body of the living subject and for converting the sensed pulse waveform to a femoral pressure electrical waveform, means receptive of each electrical waveform for digitizing each electrical waveform individually, means for defining a simulated electrical circuit simulating an aorta in terms of lumped electrical parameters, means for applying the digitized carotid pressure electrical waveform as a simulated electrical voltage input to said simulated electrical circuit comprising lumped electrical parameters, means for driving the simulated electrical circuit receptive of the digitized carotid pressure electrical waveform and for variable adjustment of the electrical parameters thereof, means for comparing an output electrical waveform of the simulated circuit simulating the femoral pressure electrical waveform and the sensed femoral pressure electrical waveform, and means for adjusting individually the simulated circuit electrical parameters until corresponding instantaneous values of the last-mentioned two electrical waveforms match said simulated circuit electrical parameters.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×