Medical guidewire with improved coil attachment
First Claim
Patent Images
1. A medical guidewire comprising:
- an elongated corewire having proximal and distal ends and having a first, uniform diameter proximal portion and a second flexible, reduced diameter distal portion;
a coiled wire spring having distal and proximal ends and including a distal portion comprised of tightly spaced coil turns and a proximal portion comprised of loosely spaced coil turns, said coiled wire spring is formed of a wire having a cylindrical cross section of a predetermined diameter and in which adjacent turns of the loosely spaced coil turns are spaced apart at least five times the diameter of the wire in the coiled wire spring;
bonding means for attaching the distal end of the coiled wire spring to the distal end of the corewire; and
, bonding means for attaching the entire portion of the coiled wire spring comprised of the loosely spaced coil turns to the uniform diameter portion of the corewire.
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Accused Products
Abstract
A medical guidewire which is comprised of an elongated corewire having a tapered distal section and a coiled wire spring positioned over the distal section and extending onto and bonded to the uniform corewire section proximal the tapered section. The turns of the corewire spring which are bonded to the periphery of the uniform section of the corewire are very widely spaced apart to thereby lock onto the corewire and thereby resist the detachment of the coiled wire spring from the corewire.
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Citations
4 Claims
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1. A medical guidewire comprising:
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an elongated corewire having proximal and distal ends and having a first, uniform diameter proximal portion and a second flexible, reduced diameter distal portion;
a coiled wire spring having distal and proximal ends and including a distal portion comprised of tightly spaced coil turns and a proximal portion comprised of loosely spaced coil turns, said coiled wire spring is formed of a wire having a cylindrical cross section of a predetermined diameter and in which adjacent turns of the loosely spaced coil turns are spaced apart at least five times the diameter of the wire in the coiled wire spring;
bonding means for attaching the distal end of the coiled wire spring to the distal end of the corewire; and
,bonding means for attaching the entire portion of the coiled wire spring comprised of the loosely spaced coil turns to the uniform diameter portion of the corewire. - View Dependent Claims (2, 3, 4)
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Specification