US 5,318,511 A · Method and apparatus for controlling the circulation of blood in a single needle circuit

Abstract

A single needle extracorporeal blood circuit for connection to a blood treatment device includes an arterial portion having an arterial reservoir, an end for connection to the needle, an end for connection to the blood treatment device, and a first valve for flow communicating the needle with the arterial reservoir. The blood circuit also includes a venous portion having a venous reservoir, an end for connection to the blood treatment device, an end for connection to the needle, and a second valve for flow communicating the needle with the venous reservoir. Detectors monitor quantities of liquid in the arterial and venous reservoirs so that the first valve is opened in response to the presence of a first predetermined quantity of liquid in the arterial reservoir or a second predetermined quantity of liquid in the venous reservoir. Similarly, the second valve is opened in response to the presence of either a third predetermined quantity of liquid in the arterial reservoir or a fourth predetermined quantity of liquid in the venous reservoir.

Claims28

Dependent claims

A single needle extracorporeal blood circuit for connection to a blood treatment device, the blood circuit comprising:

an arterial portion having a first end for connection to the needle and a second end for connection to the blood treatment device, the arterial portion including an arterial reservoir;
a venous portion having a first end for connection to the blood treatment device and a second end for connection to the needle, the venous portion including a venous reservoir;
valve means actuate between a first position for flow communicating the needle with the arterial reservoir, and a second position for flow communicating the needle with the venous reservoir;
means for monitoring quantities of liquid in the arterial reservoir and in the venous reservoir;
and
a controller including first means for actuating the valve means to the first position in response to detection by the monitoring means of a first predetermined quantity of liquid in the arterial reservoir and for actuating the valve means to the first position in response to detection of a second predetermined quantity of liquid in the venous reservoir, and second means for actuating the valve means to the second position in response to detection by the monitoring means of a third predetermined quantity of liquid in the arterial reservoir and for actuating the valve means to the second position in response to detection of a fourth predetermined quantity of liquid in the venous reservoir.

3 more elements

A method for controlling a single needle extracorporeal blood circuit for attachment to a blood treatment device, the method comprising the steps of:

monitoring a blood quantity in an arterial reservoir disposed in the blood circuit;
monitoring a blood quantity in a venous reservoir disposed in the blood circuit;
initiating blood flow from a patient to the arterial reservoir when a first predetermined quantity of blood is detected in the arterial reservoir;
initiating blood flow from a patient to the arterial reservoir when a second predetermined quantity of blood is detected in the venous reservoir;
initiating blood flow from the venous reservoir to the patient when a third predetermined quantity of blood is detected in the arterial reservoir;
and
initiating blood flow from the venous reservoir to the patient when a fourth predetermined quantity of blood is detected in the venous reservoir.

4 more elements

Dependencies are inferred from the claim text.

Method and apparatus for controlling the circulation of blood in a single needle circuit

Life of this patent

Method and apparatus for controlling the circulation of blood in a single needle circuit

Life of this patent

Abstract

Claims28