US4589419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catheter for treating arterial occlusion
Assignee: University of Iowa Research Foundation
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Filing: 1984-11-01
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Granted: 1986-05-20
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Expires: 2004-11-01
Abstract
Abstract The cardiac catheter of this invention combines in a single, thin tube, an acoustic transducer for determining blood flow velocity, and a separate lumen with a removable, flexible, radio-opaque guide wire, enabling the surgeon to locate the site of arterial blockage, evaluate the blockage, and assess the effect of the treatment.
Inventors
- 👤 Donald E. Laughlin
- 👤 Robert F. Wilson
- 👤 Thomas A. Drews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:50
CPC Classifications
A; A61; A61B; A61B8/00; A61B8/06; A61B17/00; A61B17/22; A61B8/12; A61B2017/22082; A61B90/00; A61B90/36; A61B90/37; A61B2090/378; A61B2090/3782; A61B2090/3784; A61B8/44; A61B8/4444; A61B8/445; A61B90/39
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
95 words
In the method for treating blockage of a coronary artery in which a catheter is threaded up to the site of the blockage by following a radio-opaque guide wire in the catheter flouroscopically, the improvement comprising the steps of determining the rate at which blood is flowing in the artery by means of a single-crystal Doppler transducer embedded in the side of the catheter near its distal end, administrating a vasodilator, and determining from the subsequent change in blood flow velocity measured by the Doppler transducer whether the artery downstream of the transducer is patent.
Claim 2
Dependent Claim
95 words
In the method for treating blockage of a coronary artery in which a catheter is threaded up to the site of the blockage by following a radio-opaque guide wire in the catheter flouroscopically, the improvement comprising the steps of determining the rate at which blood is flowing in the artery by means of a single-crystal Doppler transducer embedded in the side of the catheter near its distal end, administrating a vasodilator, and determining from the subsequent change in blood flow velocity measured by the Doppler transducer whether the artery downstream of the transducer is patent.
Claim 3
Dependent Claim
73 words
In a cardiac catheter of the type having more than one lumen, electrically conductive wires in one of the lumens, and in another lumen a radio-opaque guide wire, the improvement which comprises a single-crystal doppler transducer mounted on the side of the catheter near its distal end and at an acute angle to the longitudinal axis of the catheter at the mounting site of the transducer, connected to the wires in the lumen.
Claim 4
Dependent Claim
73 words
In a cardiac catheter of the type having more than one lumen, electrically conductive wires in one of the lumens, and in another lumen a radio-opaque guide wire, the improvement which comprises a single-crystal doppler transducer mounted on the side of the catheter near its distal end and at an acute angle to the longitudinal axis of the catheter at the mounting site of the transducer, connected to the wires in the lumen.
Claim 5
Dependent Claim
63 words
A catheter having a longitudinal wall, the wall defining a longitudinal lumen, and a proximal and a distal end, electrically conductive wires embedded in the wall of the catheter, and a single-crystal Doppler transducer affixed in the wall of the catheter at an acute angle to the longitudinal axis of the catheter at the mounting site of the transducer near its distal end.
Claim 6
Dependent Claim
63 words
A catheter having a longitudinal wall, the wall defining a longitudinal lumen, and a proximal and a distal end, electrically conductive wires embedded in the wall of the catheter, and a single-crystal Doppler transducer affixed in the wall of the catheter at an acute angle to the longitudinal axis of the catheter at the mounting site of the transducer near its distal end.
Claim 7
Dependent Claim
26 words
The catheter of claim 2 further comprising a longitudinal septum in the lumen of the tube dividing the lumen into an upper and a lower lumen.
References Cited (Backward Citations)
US4354500A
Cited
US4355643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |