Patent ID: 6315751
Filing Date: 2001-11-13
Classification: A61M

Abstract:
An adult sized minimally invasive cardiopulmonary bypass system for utilizing negative pressure to enhance venous drainage to a venous drainage reservoir, comprising:a source of vacuum;a venous cannula suitable for minimally invasive surgical applications and being sized no greater than 28 French;a manifold in fluid communication with the source of vacuum;a pressure regulator in fluid communication with the manifold to receive negative pressure from the source of vacuum;a hard-shelled venous reservoir sealed to the atmosphere and having a venous blood inlet port, a blood outlet port, and a vacuum inlet port;first tubing connecting the pressure regulator to the vacuum inlet port of the reservoir to transmit negative pressure to the sealed reservoir;second tubing connecting the venous cannula to the venous blood inlet port of the reservoir to transmit negative pressure from the reservoir to the venous cannula;a first pressure sensor and monitor connected to the second tubing for measuring and displaying the negative pressure of the blood in the second tubing prior to entry into the reservoir;a second pressure sensor and monitor in fluid communication with the manifold to receive negative pressure from the source of vacuum for measuring and displaying the magnitude of negative pressure from the source of vacuum;a negative pressure adjustment control in fluid communication with the manifold and the pressure regulator for adjusting the pressure within the reservoir;a check valve in fluid communication with the interior of the reservoir and configured to permit atmospheric air to enter the reservoir when the pressure in the reservoir falls below a threshold pressure; and,a vapor trap positioned in the first tubing.