×

Diastolic clamp for bioimpedance measuring device

  • US 4,870,578 A
  • Filed: 08/17/1988
  • Issued: 09/26/1989
  • Est. Priority Date: 08/19/1987
  • Status: Expired due to Fees
First Claim
Patent Images

1. A non-invasive apparatus for measuring cardiac output of a patient, comprising:

  • a bioimpedance measuring device that produces an electrical bioimpedance signal indicative of the thoracic impedance as a function of time;

    a differentiating circuit that receives a signal responsive to said electrical bioimpedance signal, and that differentiates said signal responsive to said electrical bioimpedance signal to generate a differentiated electrical signal indicative of the rate of change of thoracic impedance as a function of time; and

    a clamping circuit that periodically clamps said differentiated electrical signal to a fixed predetermined reference voltage so that said differentiated electrical signal is active only for a predetermined time duration following the beginning of each cardiac cycle.

View all claims
  • 6 Assignments
Timeline View
Assignment View
    ×
    ×