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Access disconnection system and method using signal metrics

  • US 10,413,654 B2
  • Filed: 12/22/2015
  • Issued: 09/17/2019
  • Est. Priority Date: 12/22/2015
  • Status: Active Grant
First Claim
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1. A renal failure therapy system comprising:

  • a blood filter;

    a blood pump in fluid communication with the blood filter;

    a dialysis fluid pump in fluid communication with the blood filter;

    a blood line for connection to a patient, the blood line in fluid communication with the blood filter;

    a transmitter positioned and arranged to receive a transmit signal and to transmit a wave into blood flowing through the blood line, the wave based on the transmit signal;

    a receiver positioned and arranged to receive the wave and to emit a received signal based on the received wave; and

    at least one processor for initiating the transmit signal and for receiving the received signal, the processor configured toconvert the transmit and received signals into a frequency domain,extract spectral values for the converted transmit and received signals,calculate a real part and an imaginary part of at least one of a reflection coefficient (R) or an impedance ratio (I) using the spectral values,determine at least one first baseline value for the imaginary part of at least one of R or I at a beginning of a treatment,determine at least one second baseline value for the real part of at least one of R or I at the beginning of the treatment, andcompare the imaginary part of at least one of R or I to the at least one first baseline value and compare the real part of at least one of R or I to the at least one second baseline value to determine if an access disconnection event concerning fluid communication between the blood line and the patient has occurred.

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