Blood processing device and method for purging a set of blood lines on a blood processing device
First Claim
1. A method for emptying a blood tubing set of a blood treatment device that includes an extracorporeal blood circuit with a membrane filter having a first chamber and a second chamber separated therefrom by a membrane, said first chamber conveying blood in operation of the blood treatment device and said second chamber conveying filtrate in operation of the blood treatment device, and said blood tubing set including an arterial blood tube and a venous blood tube which are both in communication with the first chamber of the membrane filter and which conduct the blood from a patient to the membrane filter and from the membrane filter to the patient in operation of the blood treatment device, and including a substituate line which opens into at least one of the arterial blood tube and the venous blood tube, and a substituate pump which is in communication with the substituate line to convey substituate from a substituate source through the substituate line, said method comprising:
- connecting the arterial blood tube and the venous blood tube to one another to provide a circuit that includes the membrane filter, the arterial blood tube, and the venous blood tube;
disconnecting the substituate line from the substituate source; and
pumping air or gas into the blood tubing set with the substituate pump to provide an excess pressure in the blood tubing set by which liquid is displaced, via the membrane, into the second chamber of the membrane filter.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for emptying a blood tubing set of a blood treatment device that includes an extracorporeal blood circuit with a membrane filter includes supplying air or gas to the blood tubing set to displace liquid therein. The blood tubing set includes arterial and venous patient blood tubes in communication with a first chamber of the membrane filter. The device also includes a substituate line which opens into the arterial blood tube and/or into the venous blood tube, and a substituate pump. To empty the blood tubing set, the arterial blood tube and the venous blood tube are connected to one another to provide a circuit that includes the membrane filter, the arterial blood tube, and the venous blood tube. The substituate line is disconnected, and the air or gas is pumped into the blood tubing set so as to displace liquid into a second chamber of the membrane filter.
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Citations
15 Claims
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1. A method for emptying a blood tubing set of a blood treatment device that includes an extracorporeal blood circuit with a membrane filter having a first chamber and a second chamber separated therefrom by a membrane, said first chamber conveying blood in operation of the blood treatment device and said second chamber conveying filtrate in operation of the blood treatment device, and said blood tubing set including an arterial blood tube and a venous blood tube which are both in communication with the first chamber of the membrane filter and which conduct the blood from a patient to the membrane filter and from the membrane filter to the patient in operation of the blood treatment device, and including a substituate line which opens into at least one of the arterial blood tube and the venous blood tube, and a substituate pump which is in communication with the substituate line to convey substituate from a substituate source through the substituate line, said method comprising:
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connecting the arterial blood tube and the venous blood tube to one another to provide a circuit that includes the membrane filter, the arterial blood tube, and the venous blood tube; disconnecting the substituate line from the substituate source; and pumping air or gas into the blood tubing set with the substituate pump to provide an excess pressure in the blood tubing set by which liquid is displaced, via the membrane, into the second chamber of the membrane filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A blood treatment device that includes an extracorporeal circuit configured for receiving a blood tubing set and a membrane filter, said membrane filter having a first chamber and a second chamber separated therefrom by a membrane, said first chamber conveying blood in operation of the blood treatment device and said second chamber conveying filtrate in operation of the blood treatment device, said blood treatment device comprising:
a substituate pump connected to a substituate line which opens into the blood tubing set and a control unit which controls the substituate pump configured to empty the blood tubing set by pumping air or gas into the blood tubing set with the substituate pump to provide excess pressure in the blood tubing set by which liquid is displaced, via the membrane, from the first chamber into the second chamber of the membrane filter. - View Dependent Claims (12, 13, 14, 15)
Specification