Vacuum-assisted venous drainage reservoir for CPB systems
First Claim
1. A vacuum assisted venous drainage system, comprising:
- a reservoir for receiving blood from a venous system of a patient;
a source of vacuum;
a conduit forming a part of a vacuum line provided between the source of vacuum and the reservoir and configured to create a negative pressure within the reservoir;
a pressure regulator in the conduit; and
a vacuum stabilizer positioned in the conduit between the pressure regulator and the reservoir, the vacuum stabilizer allowing air into the conduit from the exterior thereof to modulate extreme changes in pressure within the conduit, but preventing air from escaping from the conduit.
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Accused Products
Abstract
A vacuum-assisted venous drainage reservoir for cardiopulmonary bypass surgery with both hard and soft shell reservoirs. The system utilizes a wall vacuum or other source of negative pressure to create a negative pressure via a regulator within a sealed hard shell reservoir, or within a sealed housing surrounding a soft shell reservoir. The addition of a negative pressure in the venous return line enables the use of smaller cannulas suitable for minimally invasive surgery. The reservoir need not be positioned well below the patient as in conventional gravity venous drainage configurations, thus adding flexibility to the operating room layout and enabling a reduction in the extracorporeal blood prime volume needed. In one embodiment, a flexible membrane in the hard shell reservoir expands to contact the blood surface and reduce blood/air interactions. In another embodiment, a moisture trap is provided between the source of vacuum and hard shell reservoir to reduce environmental contamination. A volume sensor for the hard shell reservoir may be used in a feedback loop for controlling the vacuum, circulation pump, or other device. A pressure relief valve may be included in both systems for safety, and a vacuum stabilizer reduces the severity of large changes in vacuum pressure. A piece of air-permeable material may form a portion of the soft shell reservoir to vent air from within.
254 Citations
18 Claims
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1. A vacuum assisted venous drainage system, comprising:
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a reservoir for receiving blood from a venous system of a patient; a source of vacuum; a conduit forming a part of a vacuum line provided between the source of vacuum and the reservoir and configured to create a negative pressure within the reservoir; a pressure regulator in the conduit; and a vacuum stabilizer positioned in the conduit between the pressure regulator and the reservoir, the vacuum stabilizer allowing air into the conduit from the exterior thereof to modulate extreme changes in pressure within the conduit, but preventing air from escaping from the conduit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of surgery, comprising:
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securing a first cannula in a patient; securing a second cannula in a patient; connecting the first cannula to a venous reservoir blood inlet port; creating a negative pressure in the venous reservoir; regulating the pressure within the venous reservoir; stabilizing the pressure changes within the reservoir using a vacuum stabilizer positioned in a negative pressure supply conduit, the stabilizer allowing air into the conduit from the exterior thereof to modulate extreme changes in pressure within the reservoir, while preventing air from escaping the conduit; and pumping blood from the venous reservoir through a blood oxygenator and to the second cannula back to the patient. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification