Cannula for arterial and venous bypass cannulation
AssigneeUniversity of Utah
InventorJ. D. Mortensen
Life of this patent
Estimating the term…
Abstract
A cannula suitable for total bypass procedures in arterial and venous cannulation for extracorporeal perfusion of blood. The cannula has a tapered body of sufficient length for peripheral cannulation and openings through the cannula wall appropriately positioned to provide fluid transfer at various anatomical diversion sites within a patient's circulatory system in accordance with flow requirements necessary to maintain proper circulation is disclosed. The cannula structure can be adapted for bidirectional as well as unidirectional flow to maintain circulation in extremities otherwise ignored by single-directional flow cannulation. Reinforcing structure is disclosed for developing the required strength characteristics for the cannula wall, particularly for arterial applications.
Claims17
A cannula for partial emplacement within a patient's circulatory system to effect extracorporeal fluid transfer therewith, said cannula including a tubular member having inner and outer surfaces of blood and tissue compatible material, and further comprising a nonporous tube section for accomplishing extracorporeal fluid transfer to or from a second tube section which communicates therewith through a junction occurring at a terminal portion of said nonporous tube section with a nonterminal portion of said second tube section, said second tube section having concurrent bidirectional flow capability along bidirectional paths commencing at said junction and continuing toward distal ends of said second tube section, said second tube section having a tapered body along at least one of the bidirectional paths toward said distal ends, said second tube section having a plurality of openings located along the length thereof to effect proper fluid transfer.
A cannula adapted for partial emplacement in communication with arterial branches of a predetermined patient's circulatory system to effect extracorporeal fluid transfer therewith, comprising a tubular member having a tapered body and inner and outer surfaces of blood and tissue compatible material, said tubular member having a plurality of openings positioned along the length thereof, including first openings positioned toward a distal end of said cannula for transferring fluid with a cardiac region of diversion sites along an arched trunk of the patient's aorta, second openings positioned at a central region of the cannula for transferring fluid with renal artery diversion sites and third openings proximate to a projected entry site for said cannula for fluid transfer with a contralateral iliac artery diversion site, said respective first, second and third openings being separated along said cannula by distances approximately equal to corresponding distances between the respective aortic, renal and iliac diversion sites of the predetermined patient.
A cannula adapted for partial emplacement in communication with venous branches of a predetermined patient's circulatory system to effect extracorporeal fluid transfer therewith, comprising a tubular member having a tapered body and inner and outer surfaces of blood and tissue compatible material, said tubular member having a plurality of openings positioned along the length thereof, including first openings positioned toward a distal end of said cannula for transferring fluid with a cardiac region of diversion sites, second openings positioned at a central region of the cannula for transferring fluid with renal vein diversion sites and third openings proximate to a projected entry site for said cannula for fluid transfer with a contralateral iliac vein diversion site, said respective first, second and third openings being separated along said cannula by distances approximately equal to corresponding distances approximately equal to corresponding distances between the respective cardiac, renal and iliac diversion sites of the predetermined patient.
Dependencies are inferred from the claim text.