US4838879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catheter
Assignee: Terumo Corp
•
Filing: 1987-05-01
•
Granted: 1989-06-13
•
Expires: 2007-05-01
Abstract
Abstract A catheter having a curved distal end portion or a flexible distal end portion able to bend when being used, which comprises at least one radio opaque ring member provided on the circumference of the catheter, for indicating the direction of the end portion. The radio opaque ring member has an outer diameter approximately equal to that of the catheter, and a width (or a length along the axial direction of the catheter) L which satisfies the following relationship with the magnitude of the inner diameter D of the ring members: L≦Dtan(π/8).
Inventors
- 👤 Susumu Tanabe
- 👤 Masahiro Nudeshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:59
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/12; A61M; A61M25/00; A61M25/01; A61M25/0105; A61M25/0108
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
125 words
A catheter having one of a curved distal end portion and a flexible distal end portion able to bend when being used, comprising at least one radio opaque ring member circumferentially formed on said catheter, so as to cross an axial direction of said catheter, said radio opaque ring member satisfying the condition: L≦Dtan (π/8) where D is the inner diameter of said radio opaque ring member and L is the length thereof along the axial direction of said catheter, said radio opaque ring member being provided with a slit-shaped portion having substantially no radio opaque function and extending along the axial direction of said catheter whereby said radio opaque ring member with it's slit-shaped portion enables determination of the inclining direction of said catheter.
Claim 2
Dependent Claim
125 words
A catheter having one of a curved distal end portion and a flexible distal end portion able to bend when being used, comprising at least one radio opaque ring member circumferentially formed on said catheter, so as to cross an axial direction of said catheter, said radio opaque ring member satisfying the condition: L≦Dtan (π/8) where D is the inner diameter of said radio opaque ring member and L is the length thereof along the axial direction of said catheter, said radio opaque ring member being provided with a slit-shaped portion having substantially no radio opaque function and extending along the axial direction of said catheter whereby said radio opaque ring member with it's slit-shaped portion enables determination of the inclining direction of said catheter.
Claim 3
Dependent Claim
32 words
A catheter according to claim 1, wherein said slip-shaped portion has a width which falls within a range of 1/24 to 1/4 an overall circumferential length of said radio opaque ring member.
Claim 4
Dependent Claim
21 words
A catheter according to claim 1, wherein said radio opaque ring member is perpendicular to the axial direction of said catheter.
Claim 5
Dependent Claim
29 words
A catheter according to claim 1, wherein the length L of said radio opaque ring member along the axial direction of said catheter is not more than 1 mm.
Claim 6
Dependent Claim
23 words
A catheter according to claim 1, wherein the inner diameter D of said radio opaque ring member is not more than 3 mm.
Claim 7
Dependent Claim
16 words
A catheter according to claim 1, wherein said radio opaque ring member satisfies the condition: L≦Dtan(π/12).
Claim 8
Dependent Claim
29 words
A catheter according to claim 1, wherein said radio opaque ring member comprises a plurality of members spaced apart from each other and formed on said distal end portion.
Claim 9
Dependent Claim
28 words
A catheter according to claim 1, wherein said radio opaque ring member comprises at least three members which are equidistantly formed along the axial direction of said catheter.
Claim 10
Dependent Claim
17 words
A catheter according to claim 1, wherein said radio opaque ring member comprises a shape memory alloy.
Claim 11
Dependent Claim
13 words
A catheter according to claim 1, wherein said catheter is an angiographic catheter.
References Cited (Backward Citations)
US2212334A
Cited
US3483859A
Cited
US3605750A
Cited
US3885561A
Cited
US4279252A
Cited
EP0033659A2
Cited
US4657024A
Cited
US4469483A
Cited
EP0132215A1
Cited
US4571240A
Cited
US4581390A
Cited
US4671291A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |