Perfusion circuit for cardiopulmonary bypass with air removal system
First Claim
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1. A cardiopulmonary bypass circuit for oxygenating blood outside a patient and circulating oxygenated blood through the patient, said circuit comprising:
- a) a venous line;
b) a blood reservoir in fluid communication and in series with said venous line;
c) a perfusion pump in fluid communication and in series with said blood reservoir;
d) a blood oxygenator in fluid communication and in series with said pump;
e) a shunt placing said venous line and said pump in fluid communication and bypassing said blood reservoir; and
f) structure external said reservoir which prevents any store of blood in said blood reservoir from being pulled by said perfusion pump when said blood reservoir is excluded from said circuit and said perfusion pump draws blood from the patient through said shunt such that said perfusion pump pulls blood from said venous line while bypassing the any store of blood in said blood reservoir. g) an air removal means provided between said shunt and said perfusion pump which removes air bubbles from blood circulating in said circuit.
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Abstract
A condensed circuit for cardiopulmonary bypass includes an air removal system located after the junction of a shunt line and the reservoir, but before the perfusion pump. Both passive and active systems are described. The dual role of the air removal system is to remove/aspirate micro-air bubbles from the venous side of the circuit and to prevent large air boluses from entering the centrifugal pump and stopping the pump.
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Citations
34 Claims
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1. A cardiopulmonary bypass circuit for oxygenating blood outside a patient and circulating oxygenated blood through the patient, said circuit comprising:
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a) a venous line;
b) a blood reservoir in fluid communication and in series with said venous line;
c) a perfusion pump in fluid communication and in series with said blood reservoir;
d) a blood oxygenator in fluid communication and in series with said pump;
e) a shunt placing said venous line and said pump in fluid communication and bypassing said blood reservoir; and
f) structure external said reservoir which prevents any store of blood in said blood reservoir from being pulled by said perfusion pump when said blood reservoir is excluded from said circuit and said perfusion pump draws blood from the patient through said shunt such that said perfusion pump pulls blood from said venous line while bypassing the any store of blood in said blood reservoir. g) an air removal means provided between said shunt and said perfusion pump which removes air bubbles from blood circulating in said circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A method of removing air from a cardiopulmonary bypass circuit for oxygenating blood outside a patient and circulating oxygenated blood through the patient, said circuit having a venous line, a blood reservoir in fluid communication and in series with said venous line, a perfusion pump in fluid communication and in series with said blood reservoir, a blood oxygenator in fluid communication and in series with said pump, a shunt placing said venous line and said pump in fluid communication and bypassing said blood reservoir, said method comprising:
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restricting the flow of the circulating blood by creating impedance to blood flow into the pump, said restricting the flow permitting air to separate from the blood; and
removing the separated air from the circuit. - View Dependent Claims (33, 34)
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Specification