Laser-assisted guidewire having a variable stiffness shaft
Embodiments of the present invention comprise a fiber optic guidewire having a hypotube with a plurality of openings that provide variable stiffness and tracking characteristics between at least one proximal segment and one distal segment of the guidewire. In some embodiments, the guidewire further comprises a mandrel disposed within the hypotube, the mandrel cooperating with the optical fibers to permit the distal end of the hypotube to be shaped as desired by a user. Methods of manufacturing and using the guidewire are also disclosed.
1. An optical guidewire system, comprising:
a hypotube including a proximal end segment, a distal end segment, a proximal end and a distal end;
an adhesive plug arranged within the distal end segment of the hypotube, the adhesive plug including a distal end having a distal face configured in substantially a same plane as the distal end of the hypotube; and
a plurality of optical fibers disposed within the hypotube, wherein each of the plurality of optical fibers have a portion extending into a portion of the adhesive plug and each of the plurality of optical fibers terminate at the distal end of the adhesive plug,
wherein the adhesive plug surrounds at least a portion of the plurality of optical fibers and couples the plurality of optical fibers to the distal end segment of the hypotube,
wherein the distal end segment of the hypotube comprises an outer surface having a plurality of openings configured to provide variable stiffness to the hypotube, and
wherein the outer surface comprises an alternating series of circumferentially oriented hoops and longitudinally oriented braces, and arranged by having two braces between each two neighboring hoops and each of the two braces disposed on substantially opposing sides.
2. The system of claim 1 , wherein the adhesive plug comprises projections that extend radially outward from a central longitudinal axis of the hypotube and disposed between the hoops and braces.
3. The system of claim 1 , wherein the hypotube comprises Nitinol.
4. The system of claim 1 , wherein the hypotube comprises stainless steel.
5. The system of claim 1 , wherein the proximal end segment of the hypotube comprises has a first stiffness and the distal end segment has a second stiffness less than said first stiffness.
6. The system of claim 1 , wherein the hypotube has a flexibility that increases as a linear function of a position along the hypotube extending from the proximal end segment to the distal end segment.
7. The system of claim 1 , wherein the hypotube has a flexibility that increases as a smooth and continuous function of a position along the hypotube extending from the proximal end segment to the distal segment.
8. The system of claim 1 , wherein the hypotube comprises a plurality of hoops such that each hoop is coupled with an adjacent hoop via a brace.
9. The system of claim 8 , wherein the length of each hoop is constant.
10. The system of claim 9 , wherein the length of each brace is constant.
11. The system of claim 1 , further comprising a radiopaque material on or in the hypotube.
12. The system of claim 1 , further comprising a hydrophilic material on the hypotube.