Patent US5728079A successfully refreshed from Google Patents.
US5728079A
Expired / Lapsed
US
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Catheter which is visible under MRI
Assignee: Cordis Corp
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Filing: 1995-09-19
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Granted: 1998-03-17
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Expires: 2015-09-19
Abstract
Abstract In accordance with the present invention there is provided a catheter which is visible during magnetic resonance imaging of body tissue. The catheter includes a body having a proximal end, a distal end and at least one lumen extending therethrough. The body is formed from a solid material. The solid material is made from plastic and enough paramagnetic substance to render at least a predetermined portion of the catheter visible during magnetic resonance imaging of body tissue.
Inventors
- 👤 Jan Weber
- 👤 Wilhelmus Petrus Martinus Maria Van Erp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:41
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/01; A61M25/0105; A61M25/0127; G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/285; A61B; A61B90/00; A61B90/39; A61B2090/3954
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
92 words
A catheter which is visible during magnetic resonance imaging of body tissue, said catheter comprising: a body having a proximal end, a distal end and at least one lumen extending therethrough, said body having a circumference and a longitudinal axis running between said distal and proximal ends, said body having a number of coaxial layers wherein at least one layer is formed of plastic and at least one layer comprises enough solid paramagnetic substance to render at least a predetermined portion of said catheter visible during magnetic resonance imaging of body tissue.
Claim 2
Dependent Claim
92 words
A catheter which is visible during magnetic resonance imaging of body tissue, said catheter comprising: a body having a proximal end, a distal end and at least one lumen extending therethrough, said body having a circumference and a longitudinal axis running between said distal and proximal ends, said body having a number of coaxial layers wherein at least one layer is formed of plastic and at least one layer comprises enough solid paramagnetic substance to render at least a predetermined portion of said catheter visible during magnetic resonance imaging of body tissue.
Claim 3
Dependent Claim
30 words
A catheter according to claim 1, wherein one of said coaxial layers comprises a braided wire reinforcing layer wherein a predetermined portion of said braided wire comprises a paramagnetic substance.
Claim 4
Dependent Claim
24 words
A catheter according to claim 2 wherein said braided wire comprising paramagnetic material comprises an alloy of non-magnetic material and a strong paramagnetic material.
Claim 5
Dependent Claim
22 words
A catheter according to claim 3, wherein the alloy comprises at least one material from the group including titanium, copper and nickel.
Claim 6
Dependent Claim
27 words
The catheter according to claim 1 wherein the coaxial layer comprising paramagnetic substance is sandwiched between two layers of plastic material being substantially free from paramagnetic substance.
Claim 7
Dependent Claim
29 words
A catheter according to claim 1 wherein the paramagnetic substance has been chosen from the group comprising: copper, manganese, chromium, nickel, gadolinium, dysprosium and mixtures, alloys and salts thereof.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-03-16 | 2001-09-15 | 2002-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-16 | 2005-09-15 | 2006-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-16 | 2009-09-15 | 2010-03-17 | $7700.00 | Window Closed / Lapsed |