Systems and methods for dialysis access disconnection
AssigneesBaxter International Inc., Baxter Healthcare S.A.
InventorsRamesh Wariar, James Han, George Lamberson, Thomas P. Hartranft, Thore Falkvall
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Abstract
An access disconnection method for a machine employing a blood circuit, the blood circuit having a machine segment and a patient access segment, the method comprising: injecting an electrical signal into the blood circuit between the machine segment and the patient access segment; attempting to cause the electrical signal to flow through only the patient access segment and to bypass the machine segment; and measuring the signal in the patient access segment and determining that an access disconnection event has occurred upon a threshold change in the measured signal.
Claims20
An access disconnection method comprising:
- measuring a lumped impedance through a machine segment of a blood circuit;
- measuring a lumped impedance through a patient access segment of the blood circuit;
- combining the lumped machine segment impedance with the lumped patient access impedance to form a total impedance;
- and
- detecting that an access disconnection has occurred when the total impedance approaches the lumped machine segment impedance.
An access disconnection method for a machine employing a blood circuit, the blood circuit having a machine segment and a patient access segment, the method comprising:
- injecting an electrical signal into the blood circuit between the machine segment and the patient access segment;
- attempting to cause the electrical signal to flow through only the patient access segment and to bypass the machine segment;
- and
- measuring the signal in the patient access segment and determining that an access disconnection event has occurred upon a threshold change in the measured signal.
A dialysis system employing an access disconnection method, the dialysis system comprising:
- a blood pump;
- a dialyzer in blood circuit communication with the blood pump;
- an air removal apparatus in blood circuit communication with the dialyzer;
- an arterial access line of the blood circuit extending from the blood pump to an arterial access needle;
- a venous access line extending from the air removal apparatus to a venous access needle;
- arterial and venous conductive connections placed respectively in the arterial and venous access lines;
- a first electrical potential source electrically connected to apply a first potential to the arterial and venous conductive contacts;
- and
- a second electrical potential source electrically connected to the blood circuit opposite the arterial and venous conductive connections from the arterial and venous access needles.
Dependencies are inferred from the claim text.