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 perimeter at a location within the proximal portion and a second perimeter at a location within the distal portion, the second perimeter being greater than the first perimeter; and
a tip portion extending from the main cannula portion to a distal end of the cannula, the tip portion comprising;
a discharge opening configured to discharge blood externally to the cannula; and
a redirecting member configured to direct blood flow being discharged through the discharge opening along the cannula toward the proximal portion of the main cannula portion.
4 Assignments
0 Petitions
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
31 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 perimeter at a location within the proximal portion and a second perimeter at a location within the distal portion, the second perimeter being greater than the first perimeter; and a tip portion extending from the main cannula portion to a distal end of the cannula, the tip portion comprising; a discharge opening configured to discharge blood externally to the cannula; and a redirecting member configured to direct blood flow being discharged through the discharge opening along the cannula toward the proximal portion of the main cannula portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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 main cannula portion comprising an inlet for one of the first and second lumens, and at least one of the first and second lumens is configured to reduce the effect of flow resistance therein; and a tip portion extending from the main cannula portion to a distal end of the cannula, the tip portion comprising; a discharge opening fluidly coupled to the inlet through one of the first and second lumens and located distally of the inlet; and a redirecting member configured to direct blood flow being discharged through the discharge opening along the cannula toward the proximal portion of the main cannula portion; and inserting the cannula into the vasculature of the patient such that the redirecting member is located in the vasculature. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. 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 main cannula portion comprising an inlet for one of the first and second lumens; and a tip portion extending from the main cannula portion to a distal end of the cannula, the tip portion comprising; a discharge opening fluidly coupled to the inlet through one of the first and second lumens and located distally of the inlet; and a redirecting member configured to direct blood flow being discharged through the discharge opening along the cannula toward the proximal portion of the main cannula portion; wherein at least one of the first and second lumens is configured to reduce the effect of flow resistance therein. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification