Venous filter for assisted venous return
First Claim
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1. A device for removing air from venous blood of a patient, comprising:
- a container having a blood inlet for receiving the venous blood, a volume for holding venous blood, a blood outlet, and a vacuum port;
an air sensor for sensing the presence of air within an interior portion of the container near the vacuum port; and
a vacuum source for automatically supplying vacuum to the vacuum port in response to the air sensor sensing the presence of air.
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Abstract
The need for a venous reservoir in a heart-lung machine is obviated by using a vacuum-purged negative-pressure air filter in the venous return line ahead of the main blood pump. The purging vacuum for the venous air filter can also be used to purge air from the cardiotomy reservoir if a backflow-preventing valve is used on the venous air filter.
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Citations
26 Claims
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1. A device for removing air from venous blood of a patient, comprising:
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a container having a blood inlet for receiving the venous blood, a volume for holding venous blood, a blood outlet, and a vacuum port; an air sensor for sensing the presence of air within an interior portion of the container near the vacuum port; and a vacuum source for automatically supplying vacuum to the vacuum port in response to the air sensor sensing the presence of air. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for removing air from venous blood of a patient, comprising:
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introducing venous blood through a blood inlet into a container; sensing the presence of air within an interior portion of the container with an air sensor; automatically withdrawing air from the container by a vacuum source in response to sensing the presence of air until air is no longer sensed within the interior portion of the container; and withdrawing blood through a blood outlet. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification