Cannulae having reduced flow resistance
First Claim
1. A percutaneous cannula for the exchange of blood within a patient'"'"'s vasculature, the cannula comprising:
- a main cannula portion comprising a proximal portion, a distal portion, a first lumen, and a second lumen extending through the proximal portion, the first lumen having a first cross-sectional area at a location within the proximal portion and a second cross-sectional area at a location within the distal portion, the second cross-sectional area being greater than the first cross-sectional area; and
a tip portion extending from the main cannula portion to a distal end of the cannula, the tip portion comprising;
a discharge opening; and
a redirecting member configured to direct blood flow being discharged through the discharge opening proximally along the cannula.
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Accused Products
Abstract
A percutaneous cannula is provided for the exchange of blood within a patient'"'"'s vasculature. The cannula includes a main cannula portion and a tip portion. The main cannula portion comprises a proximal portion, a distal portion, a first lumen, and a second lumen extending through the proximal portion. The tip portion extends from the main cannula portion to a distal end of the cannula. The tip portion comprises a discharge opening and a redirecting member. The redirecting member is configured to direct blood flow being discharged through the discharge opening proximally along the cannula. At least one of the first and second lumens is configured to reduce the effect of flow resistance therein.
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Citations
17 Claims
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1. A percutaneous cannula for the exchange of blood within a patient'"'"'s vasculature, the cannula comprising:
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a main cannula portion comprising a proximal portion, a distal portion, a first lumen, and a second lumen extending through the proximal portion, the first lumen having a first cross-sectional area at a location within the proximal portion and a second cross-sectional area at a location within the distal portion, the second cross-sectional area being greater than the first cross-sectional area; and
a tip portion extending from the main cannula portion to a distal end of the cannula, the tip portion comprising;
a discharge opening; and
a redirecting member configured to direct blood flow being discharged through the discharge opening proximally along the cannula. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of treating a patient, comprising:
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providing a percutaneous cannula comprising a main cannula portion comprising a proximal portion, a distal portion, a first lumen, and a second lumen extending through the proximal portion, the first lumen having a first cross-sectional area at a location within the proximal portion and a second cross-sectional area at a location within the distal portion, the second cross-sectional area being greater than the first cross-sectional area; and
a tip portion extending from the main cannula portion to a distal end of the cannula, the tip portion comprising;
a discharge opening; and
a redirecting member configured to direct blood flow being discharged through the discharge opening proximally along the cannula. using the cannula to treat the patient. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A percutaneous cannula for the exchange of blood within a patient'"'"'s vasculature, the cannula comprising:
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a main cannula portion comprising a proximal portion, a distal portion, a first lumen, and a second lumen extending through the proximal portion; and
a tip portion extending from the main cannula portion to a distal end of the cannula, the tip portion comprising;
a discharge opening; and
a redirecting member configured to direct blood flow being discharged through the discharge opening proximally along the cannula;
wherein at least one of the first and second lumens is configured to reduce the effect of flow resistance therein. - View Dependent Claims (14, 15, 16, 17)
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Specification