Access disconnection system and method using signal metrics
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
Renal failure therapy system includes a blood filter, a blood pump, a dialysis fluid pump, a blood line connecting to a patient, a transmitter for receiving a transmit signal and transmitting a wave into blood flowing through the blood line, a receiver for receiving the wave and emitting a corresponding received signal, and a processor for initiating the transmit signal and for receiving the received signal, configured to convert the transmit and received signals into a frequency domain, extract spectral values for the converted transmit and received signals, calculate at least one of a reflection coefficient (R) or an impedance ratio (I) using the spectral values, and analyze an imaginary part of at least one of R or I to determine if an access disconnection event concerning fluid communication between the blood line and the patient has occurred.
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Citations
24 Claims
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1. A renal failure therapy system comprising:
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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 to convert 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, and compare 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A renal failure therapy system comprising:
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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 to convert 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, and compare plural ones of (i) the imaginary part of at least one of R or I to the at least one first baseline value, (ii) a phase shift of R, (iii) a phase shift of I, (iv) the real part of at least one of R or I to the at least one second baseline value, (v) a magnitude of R, and (vi) a magnitude of I, and apply an algorithm to the analyzed plural ones of (i) to (vi) to determine if an access disconnection event concerning fluid communication between the blood line and the patient has occurred. - View Dependent Claims (22, 23, 24)
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Specification