Multi-lumen cannula
First Claim
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1. A method for implanting a cannula into a cardiovascular system, the method comprising:
- creating a single puncture site into the cardiovascular system for receiving the cannula;
inserting the cannula through the puncture site such that a distal end of a first lumen of the cannula and a distal end of a second lumen of the cannula pass through the puncture site into the cardiovascular system, the second lumen having a non-circular cross-sectional shape extending between a first end portion and a second end portion, the first and second end portions having rounded corners each with a radius greater than about ten percent of the radius of the largest circle that can be inscribed within the second lumen and less than the radius of the largest circle that can be inscribed within the second lumen;
positioning the distal end of the first lumen of the cannula within a first portion of the cardiovascular system; and
positioning the distal end of the second lumen of the cannula within a second portion of the cardiovascular system, such that in use blood is received in the cannula from the distal end of the second lumen and blood is pumped from the cannula through the distal end of the first lumen having a cross-sectional area smaller than the cross-sectional area of the second lumen.
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Abstract
This document relates to methods and materials for providing blood flow for a blood pump recipient. For example, cannulae that can be connected to the circulatory system of a mammal and can be used in conjunction with a blood pump (e.g., an assist device) are provided.
39 Citations
21 Claims
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1. A method for implanting a cannula into a cardiovascular system, the method comprising:
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creating a single puncture site into the cardiovascular system for receiving the cannula; inserting the cannula through the puncture site such that a distal end of a first lumen of the cannula and a distal end of a second lumen of the cannula pass through the puncture site into the cardiovascular system, the second lumen having a non-circular cross-sectional shape extending between a first end portion and a second end portion, the first and second end portions having rounded corners each with a radius greater than about ten percent of the radius of the largest circle that can be inscribed within the second lumen and less than the radius of the largest circle that can be inscribed within the second lumen; positioning the distal end of the first lumen of the cannula within a first portion of the cardiovascular system; and positioning the distal end of the second lumen of the cannula within a second portion of the cardiovascular system, such that in use blood is received in the cannula from the distal end of the second lumen and blood is pumped from the cannula through the distal end of the first lumen having a cross-sectional area smaller than the cross-sectional area of the second lumen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A cannula for use with a blood pump, the cannula comprising:
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a housing having a proximal region, a distal region, and an intermediate region located between the proximal and distal regions, wherein the housing defines a first lumen and a second lumen, wherein the first lumen comprises; (a) a proximal end located at or near the proximal region of the housing and adapted to engage the blood pump, and (b) a distal end located at or near the distal region of the housing and adapted to be positioned within a cardiovascular system, wherein the second lumen comprises; (a) a proximal end located at or near the proximal region of the housing and adapted to engage the blood pump, and (b) a distal end located at or near the intermediate region of the housing and adapted to be positioned within the cardiovascular system, wherein one of the first and second lumens has a cross-sectional shape extending between a first end portion and a second end portion, the first and second end portions having rounded corners each with a radius greater than about ten percent of the radius of the largest circle that can be inscribed within the one of the first and second lumens and less than the radius of the largest circle that can be inscribed within the one of the first and second lumens, such lumen with rounded corners being off-set from the geometric center of the other lumen. - View Dependent Claims (18, 19, 20, 21)
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Specification