Guidewire having radiopaque distal tip
First Claim
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1. A guidewire having a radiopaque distal tip comprising:
- a) an elongated core wire including a first, uniform diameter cylindrical core wire portion and a second more flexible, reduced diameter core wire portion at the distal end of said uniform diameter portion;
b) a coiled wire spring having distal and proximal ends attached to the core wire and extending from the uniform diameter portion to the distal end of the reduced diameter portion of the core wire;
c) a cylindrical band formed of a highly radiopaque material interposed between the coiled wire spring and the core wire and extending from the distal end of the core wire along the flexible portion of the core wire and being of a length which is substantially shorter than the length of the flexible portion of the core wire; and
,d) a weld bead fused to the distal end of the core wire, the distal end of the cylindrical band and the distal end of the coiled spring, to thereby provide a single unitary structure.
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Abstract
A flexible guidewire having a radiopaque marker at its distal end. The marker is defined by a platinum band attached to a reduced diameter portion of a guidewire core wire. A flexible spring overlies the radiopaque marker bank. The spring is constructed of stainless steel. A weld band is formed at the distal end of the core wire and is fused to the distal end of the marker band to thereby cause these elements to be fused into a single unitary structure.
70 Citations
6 Claims
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1. A guidewire having a radiopaque distal tip comprising:
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a) an elongated core wire including a first, uniform diameter cylindrical core wire portion and a second more flexible, reduced diameter core wire portion at the distal end of said uniform diameter portion; b) a coiled wire spring having distal and proximal ends attached to the core wire and extending from the uniform diameter portion to the distal end of the reduced diameter portion of the core wire; c) a cylindrical band formed of a highly radiopaque material interposed between the coiled wire spring and the core wire and extending from the distal end of the core wire along the flexible portion of the core wire and being of a length which is substantially shorter than the length of the flexible portion of the core wire; and
,d) a weld bead fused to the distal end of the core wire, the distal end of the cylindrical band and the distal end of the coiled spring, to thereby provide a single unitary structure. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification