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US 5,001,825 AGranted
Catheter guidewire fabrication method
AssigneeCordis Corporation
InventorDavid S. Halpern
Life of this patent
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Abstract
A fabrication process for a guidewire. A guidewire core is provided by drawing down a metal wire in stages. The wire is drawn through a first die to produce a first diameter wire. This first diameter wire is then partially drawn through a second die to provide a second, reduced diameter wire segment at one end of the core wire.
Claims3
A method of fabricating a guidewire to be inserted within a subject comprising the steps of:
- (a) providing an elongated core wire of a specified diameter and length;
- (b) drawing the core wire at ambient temperature through a plurality of dies having different inner diameters thereby forming:
- a first cylindrical portion;
- a second cylindrical portion having a diameter less than a diameter of the first cylindrical portion and located distalward of the first cylindrical portion;
- a first region separating said first and second cylindrical portions, said region comprising a plurality of shouldered cylindrical steps and having less axial length than either said first or second cylindrical portion;
- a third cylindrical portion having a diameter less than the diameter of the second cylindrical portion and located distalward of the second cylindrical portions;
- and
- a second region separating said second and third cylindrical portions, said region comprising a plurality of shouldered cylindrical steps and having less axial length than either said second or third cylindrical portions;
- and
- (c) surrounding at least a portion of the core wire with a flexible coiled spring.
7 more elements
Dependencies are inferred from the claim text.