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US 4,922,924 AGranted
Catheter guidewire with varying radiopacity
AssigneeC. R. Bard, Inc.
InventorsRichard A. Gambale, James F. Crittenden
Life of this patent
Estimating the term…
Abstract
A guidewire for use with a catheter has segments of varying radiopacity. The guidewire includes a coil assembly at its distal end, the coil assembly being formed from a highly radiopaque coil and a non-radiopaque coil, arranged in bifilar arrangement to define a moderate radiopacity section in which the radiopaque and non-radiopaque segment alternate and a highly radiopaque section composed solely of the highly radiopaque coil.
Claims7
A guidewire comprising:
- an elongate flexible shaft;
- a flexible coil assembly on the distal end of the shaft, the coil assembly being formed from a first coil formed from a highly radiopague material which extends the full length of the coil assembly and a second substantially non-radiopaque coil, shorter than the first coil, and interposed in bifilar configuration between some of the turns of the first coil to define a less radiopague segment of the coil assembly.
Dependencies are inferred from the claim text.