US4922924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catheter guidewire with varying radiopacity
Assignee: Medtronic Vascular Inc
•
Filing: 1989-04-27
•
Granted: 1990-05-08
•
Expires: 2009-04-27
Abstract
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.
Inventors
- 👤 Richard A. Gambale
- 👤 James F. Crittenden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:26
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/01; A61M25/09; A61M2025/09166; A61M2025/09175
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
77 words
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.
Claim 2
Dependent Claim
77 words
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.
Claim 3
Dependent Claim
22 words
A guidewire as defined in claim 1 wherein the less radiopague segment is located at the proximal end of the coil assembly.
Claim 4
Dependent Claim
28 words
A guidewire as defined in claim 2 further comprising: the proximal end of the first and second coils being adhesively connected to each other and to the shaft.
Claim 5
Dependent Claim
30 words
A guidewire as defined in any of claims 1-3 wherein the highly radiopague first coil is formed from metal and the non-radiopague second coil is formed from a polymeric material.
Claim 6
Dependent Claim
22 words
A guidewire as defined in claim 4 wherein the polymeric second coil is of a larger diameter than the metal first coil.
Claim 7
Dependent Claim
29 words
A guidewire as defined in any of claims 1-3 wherein one of the coils is larger than the other, the larger coil being, at least at its surface, lubricious.
Claim 8
Dependent Claim
18 words
A guidewire as defined in claim 6 wherein the larger coil is formed from a low friction polymer.
References Cited (Backward Citations)
US3749085A
Cited
US3789841A
Cited
US3731671A
Cited
US3749086A
Cited
US4080706A
Cited
US4003369A
Cited
US4020829A
Cited
US4215703A
Cited
US4545390A
Cited
US4554929A
Cited
US4538622A
Cited
US4619274A
Cited
US4748986A
Cited
US4763647A
Cited
US4773432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-07 | 1993-11-06 | 1994-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-07 | 1997-11-06 | 1998-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-07 | 2001-11-06 | 2002-05-08 | $7700.00 | Window Closed / Lapsed |