Hollow medical wires and methods of constructing same
First Claim
Patent Images
1. A hollow medical guidewire, comprising:
- an elongate hollow body having distal and proximal sections, said body being at least partially constructed from a transformational, non-linear superelastic nickel titanium alloy material, wherein at least said distal section has recoverable strain and exhibits an unloading plateau stress of not less than about 170 MPa;
wherein said distal section is provided with openings to allow fluids to escape.
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Abstract
The present invention provides an apparatus for performing angioplasty or vascular intervention procedures. The apparatus of the present invention comprises a catheter apparatus comprised of a superelastic hollow guidewire, a balloon member and a flexible tip. The superelastic hollow guidewire of the invention is preferably a hypotube of nitinol alloy. The use of nitinol alloy as hollow guidewire provides a catheter apparatus having high flexibility and torqueability as well as small cross sectional diameter.
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Citations
34 Claims
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1. A hollow medical guidewire, comprising:
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an elongate hollow body having distal and proximal sections, said body being at least partially constructed from a transformational, non-linear superelastic nickel titanium alloy material, wherein at least said distal section has recoverable strain and exhibits an unloading plateau stress of not less than about 170 MPa;
wherein said distal section is provided with openings to allow fluids to escape. - View Dependent Claims (2, 3)
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- 4. A medical catheter comprising an elongate hollow body at least partially constructed from a transformational non-linear superelastic nickel titanium alloy material and having at least one opening at the distal end to allow the escape of fluids, said alloy material exhibiting a substantially constant stress upon unloading of between about 170 MPa and 400 MPa.
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10. An irrigation catheter, comprising:
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an elongate hollow body having distal and proximal sections, said body being at least partially constructed from a transformational, non-linear, superelastic nickel titanium alloy material, wherein at least said distal section has recoverable strain and exhibits an unloading plateau stress of not less than about 170 MPa;
a lumen formed in said body extending from the proximal section to the distal section for communicating fluids from said proximal section of said body to said distal section of said body; and
one or more perforations in the distal section of the body to allow the escape of fluids. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An irrigation catheter, comprising:
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an elongate hollow body having a proximal end and a distal end and a lumen extending therethrough, said body being constructed at least partially from a transformational, non-linear, superelastic nickel-titanium alloy material which exhibits a substantially constant stress upon unloading of not less than about 170 MPa; and
a coil member extending from the distal end of the body, the coil member being in fluid communication with the lumen of the body and having turns which provide a passageway for fluids to pass therethrough. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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28. An irrigation catheter, comprising:
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a hollow elongate tubular body having a proximal end and a distal end and a lumen extending therethrough, the body being constructed at least partially from a transformation nonlinear superelastic nickel titanium alloy material, said alloy material exhibiting a substantially constant stress upon unloading of between about 170 MPa and 400 MPa;
an occlusion device on the distal end of the elongate body;
at least one perforation in the body near the distal end; and
a valve member attached over the at least one perforation to control fluid flow through the perforation. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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Specification