Spring cannulae
AssigneeEdwards Lifesciences Corporation
InventorsManouchehr A. Miraki, Bryan A. Janish, Raymond J. McManus, Brent K. Hoffman
Life of this patent
Estimating the term…
Abstract
Disclosed herein are embodiments of spring cannulae, including one or more holes in the sidewall of the cannula. Some disclosed cannulae include a wire, helically wound to form coils, and at least one hole in the cannula that interrupts one or more of the coils. Some embodiments further include a fused region of the coils through which the hole passes. Some embodiments include a ring attached to ends of the interrupted coils, where the hole is surrounded by the ring. Some embodiments include a sheath that is attached to a radial surface of the interrupted coils, where the hole passes radially though the sheath.
Claims20
A cannula comprising:
- a wire that is helically wound to form a plurality of coils, wherein the plurality of coils comprises at least one coil portion that is wound at a smaller angle relative to a central axis of the cannula than adjacent coils positioned at opposite ends of the at least one coil portion;
- and
- an insert comprising a porous section defining at least one hole passing radially through the insert, wherein the insert is positionable between the adjacent coils and the at least one coil portion is positionable on the insert and is spaced apart from the at least one hole.
A cannula comprising:
- a wire that is helically wound to form a plurality of coils, wherein the plurality of coils comprises a first stretched coil portion that is wound at a smaller angle relative to a central axis of the cannula than adjacent coils positioned at opposite ends of the first stretched coil portion such that the first stretched coil portion is stretched axially relative to the adjacent coils;
- and
- an insert comprising a first porous section defining at least one hole passing radially into the first porous section, wherein the first porous section is positioned along a length of the first stretched coil portion, with a portion of the wire defining the first stretched coil portion positioned on an exterior surface of the first porous section.
A cannula comprising:
- a wire that is helically wound to form a plurality of coils, wherein the plurality of coils comprises at least two compressed coil portions wherein the coils are coiled such that adjacent coils are touching each other, the plurality of coils comprises at least one stretched coil portion that is wound at a smaller angle relative to a central axis of the cannula than adjacent coils positioned at opposite ends of the at least one coil portion;
- and
- an insert comprising a porous section defining at least one hole passing radially through the insert, wherein the insert is positioned between the two compressed coil portions and the at least one stretched coil portion is positioned on the insert and is spaced apart from the at least one hole.
Dependencies are inferred from the claim text.