Recirculation of blood in an extracorporeal blood treatment system
First Claim
1. An extracorporeal blood treatment apparatus comprising:
- a blood treatment unit;
a treatment fluid circuit including a treatment fluid pump operative to circulate treatment fluid around the treatment fluid circuit and through the blood treatment unit;
a blood circuit including a blood pump with dual chambers operative to circulate blood around the blood circuit and through the blood treatment unit, an arterial line for withdrawing blood from a patient, and a venous line for returning the treated blood to the patient, the arterial line and venous lines being configured to be switched between a first condition in which they are connected to the patient and a second condition in which they are disconnected from the patient and connected to each other for recirculation of blood through the blood circuit; and
a controller configured to operate the pumps in a treatment mode during which both the blood pump and the treatment fluid pump are operated to circulate blood and treatment fluid through the blood treatment unit while the arterial and venous lines are in the first condition, and in a recirculation mode during which the treatment fluid pump is inactivated and the blood pump is operated to circulate the blood through the blood circuit while the arterial and venous lines are in the second condition.
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Accused Products
Abstract
An extracorporeal blood treatment apparatus includes a blood treatment unit, a treatment fluid circuit, and a blood circuit. The treatment fluid circuit has a treatment fluid pump for circulating treatment fluid around the treatment fluid circuit and through the blood treatment unit. The blood circuit has a dual chamber blood pump for circulating blood around the blood circuit and through the blood treatment unit. An arterial line withdraws blood from a patient and delivers the withdrawn blood to the blood treatment unit. A venous line returns the treated blood to the patient. The arterial and venous lines can be switched between a first condition in which they are connected to the patient and a second condition in which they are disconnected from the patient and connected to each other for recirculation of blood through the blood circuit. A controller operates the blood pump, and switches the blood pump between a condition in which the dual chambers operate in phase with each other and a condition in which the dual chambers operate out of phase with each other.
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Citations
16 Claims
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1. An extracorporeal blood treatment apparatus comprising:
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a blood treatment unit;
a treatment fluid circuit including a treatment fluid pump operative to circulate treatment fluid around the treatment fluid circuit and through the blood treatment unit;
a blood circuit including a blood pump with dual chambers operative to circulate blood around the blood circuit and through the blood treatment unit, an arterial line for withdrawing blood from a patient, and a venous line for returning the treated blood to the patient, the arterial line and venous lines being configured to be switched between a first condition in which they are connected to the patient and a second condition in which they are disconnected from the patient and connected to each other for recirculation of blood through the blood circuit; and
a controller configured to operate the pumps in a treatment mode during which both the blood pump and the treatment fluid pump are operated to circulate blood and treatment fluid through the blood treatment unit while the arterial and venous lines are in the first condition, and in a recirculation mode during which the treatment fluid pump is inactivated and the blood pump is operated to circulate the blood through the blood circuit while the arterial and venous lines are in the second condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification