Patent US3935857A successfully refreshed from Google Patents.
US3935857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cardiac catheter
Assignee: Individual
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Filing: 1974-07-31
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Granted: 1976-02-03
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Expires: 1994-07-31
Abstract
Abstract A catheter for cardiac studies which is made of relatively high torque plastic material and which is formed with a pair of straight legs joined by a continuous curve and wherein the said legs are disposed at an angle of 85°. The curve is such that the straight line distance from its midpoint to the intersection of the imaginary inward extensions of said legs is 1/4 the chordal straight line distance between the two points where the said straight legs merge into said curve.
Inventors
- 👤 Eddy D. Co
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:35
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/50; A61B6/504; A61M; A61M25/00; A61M25/0021; A61M25/0041; A61B6/48; A61B6/481; A61M25/01; A61M25/0105; A61M25/0108
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
191 words
A catheter for insertion through the aorta and into tip engagement with a coronary artery ostium of a human heart, said catheter comprising: a. a preformed tubular body of relatively high torque flexible plastic and of substantially constant thickness throughout, b. said body having straight inner and outer legs joined by a continuously curved central portion and with said outer leg forming the tip of the catheter, c. said continuously curved central portion being of substantially infinite radius at its points of merger with said legs and gradually decreasing in radius inwardly from said points toward its central point, d. said legs being disposed at an angle of substantially 85° to each other, e. the straight line distance from said curved portion's midpoint to the intersection of the imaginary inward extensions of said legs (FIG. 7, line D-E) being about 1/4 the chordal straight line distance between the points of merger of said legs with said curved portion (FIG. 7, line A-B), f. the construction being such that said catheter is usable for tip engagement with either the left or right artery ostium and without falling therefrom during photographic heart studies.
Claim 2
Dependent Claim
191 words
A catheter for insertion through the aorta and into tip engagement with a coronary artery ostium of a human heart, said catheter comprising: a. a preformed tubular body of relatively high torque flexible plastic and of substantially constant thickness throughout, b. said body having straight inner and outer legs joined by a continuously curved central portion and with said outer leg forming the tip of the catheter, c. said continuously curved central portion being of substantially infinite radius at its points of merger with said legs and gradually decreasing in radius inwardly from said points toward its central point, d. said legs being disposed at an angle of substantially 85° to each other, e. the straight line distance from said curved portion's midpoint to the intersection of the imaginary inward extensions of said legs (FIG. 7, line D-E) being about 1/4 the chordal straight line distance between the points of merger of said legs with said curved portion (FIG. 7, line A-B), f. the construction being such that said catheter is usable for tip engagement with either the left or right artery ostium and without falling therefrom during photographic heart studies.
Claim 3
Dependent Claim
18 words
The catheter of claim 1 in which said outer leg portion is shorter than said inner leg portion.
Claim 4
Dependent Claim
19 words
The catheter of claim 2 wherein distance DE is about 9 mm and distance AB is about 36 mm.
Claim 5
Dependent Claim
38 words
The catheter of claim 3 wherein the minimum length of said outer leg (FIG. 7, line A-C) is 14 mm (± 2 mm); and the distances AD and BD of FIG. 7 are 27 mm (± 2 mm).
Claim 6
Dependent Claim
24 words
The catheter of claim 4 in which said catheter is made of material which is shape stable in the range of internal body temperatures.
References Cited (Backward Citations)
US3485234A
Cited
US3612038A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |