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Heart Surgery

Perfusion-shunt-device-and-method

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Perfusion shunt device and method

Details

Inventors: Klein, Enrique J.; Goeld, Paul M.;
Assignee: Localmed, Inc. (Palo Alto, CA)
Primary Examiner: Rosenbaum; C. Fred
Assistant Examiner: Van Over; Perry E.
Attorney, Agent or Firm: Townsend and Townsend and Crew

A perfusion shunt device is used in conjunction with balloon catheters to provide blood perfusion across an inflated balloon in a blood vessel. The perfusion shunt device comprises a flexible conduit structure having one or more blood perfusion paths formed from a proximal end to a distal end thereof. The flexible conduit structure is usually attached directly or indirectly to a proximal shaft structure. Discrete anchors or expansible sleeves or cages are provided for locating the conduit structure over the balloon on the catheter. The flexible conduit structure will not be directly attached to the balloon, but rather will be secured at locations distal to an proximal of the balloon. In this way, constriction and distortion of the conduit structure and/or balloon resulting from balloon expansion are minimized. The device may be loaded over a conventional angioplasty balloon catheter within or outside of the blood vessel being treated, either before or after an angioplasty procedure.

DETAILED DESCRIPTION According to the present invention, apparatus and methods are provided for establishing perfusion blood flow past an expanded balloon in a blood vessel during angioplasty and related procedures.
Apparatus comprise a perfusion shunt device which includes a flexible conduit structure having one or more blood perfusion paths extending axially over at least a portion thereof.
Methods comprise securing the flexible conduit structure to an expansible balloon on a vascular catheter prior to balloon expansion in the blood vessel.
The flexible conduit structure is attached to the catheter at positions proximal of and distal to the expansible balloon.
In particular, the flexible conduit will not be attached to the balloon structure itself.
By securing the flexible conduit to the catheter only at positions proximally and distally of the balloon, balloon expansion will not be constrained by direct attachment to the flexible conduit, and the flexible conduit will be able to shift position as the balloon radially expands.
Additionally, by securing the flexible conduit to the catheter at positions which lie immediately proximal of and distal to the expansible balloon, the flexible conduit will be deformed in a desirable arcuate profile which further exposes the proximal and distal ends of the flow paths to the blood vessel lumen as the balloon is expanded.
The perfusion shunt devices of the present invention comprise the flexible conduit structure, a proximal shaft structure extending proximally from the conduit structure, and means for securing the conduit structure to the catheter at locations proximal of and distal to an expansible balloon on the catheter.
The blood perfusion path(s) on the flexible conduit structure may be in the form of fully-enclosed axial lumens having a plurality of spaced-apart ports to permit the inflow and outflow of blood, open axial channels which permit the inflow and outflow of blood at any location, or any other structure on or adjacent to the conduit structure which, when the balloon is expanded against the inner wall of the blood vessel, will provide a blood perfusion path(s) past the expanded balloon

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