US3838683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-contained electromagnetic flow sensor
Assignee: KOLIN ALEXANDER 1298 STRADELLA ROAD LOS ANGELES CALIFORNIA 90077
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Filing: 1972-01-21
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Granted: 1974-10-01
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Expires: 1992-01-21
Abstract
Abstract An electromagnetic catheter type flow sensor is provided in which a magnetic field is generated by two roughly parallel insulated bundels of wire carrying equal currents in opposite directions, and which includes electrodes affixed to the insulated wire bundles. The flow sensor may be introduced, for example, through a branch artery into a main artery in a human or animal to measure blood flow in the main artery, and it is constructed to constrict as it is introduced through the branch artery and to expand when in the main artery so as to span at least a portion of the diameter of the main artery.
Inventors
- 👤 A Kolin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:53
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/68; A61B5/6846; A61B5/6847; A61B5/6852; A61B5/6856; A61B5/02; A61B5/026; A61B5/0265; A61B5/027; A61B5/103; A61B5/107; A61B5/1076
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
72 words
Flow sensor comprising: deformable terminally closed loop means collapsible to an elongated narrow configuration, adapted to be inserted into a conduit in a collapsed condition and to reside in the conduit, and expandable therein to a loop configuration, said terminally closed loop means including a coil means for forming a magnetic field within the conduit, sensor means supported by said loop means, and electrically conductive lead means connected to said sensor means.
Claim 2
Dependent Claim
72 words
Flow sensor comprising: deformable terminally closed loop means collapsible to an elongated narrow configuration, adapted to be inserted into a conduit in a collapsed condition and to reside in the conduit, and expandable therein to a loop configuration, said terminally closed loop means including a coil means for forming a magnetic field within the conduit, sensor means supported by said loop means, and electrically conductive lead means connected to said sensor means.
Claim 3
Dependent Claim
49 words
Sensor in accordance with claim 1, wherein said sensor means comprises a pair of spaced electrodes mounted on opposite sides of said terminally closed loop means and supported thereby, in position such that the line joining said electrodes is parallel to the plane of said terminally closed loop means.
Claim 4
Dependent Claim
28 words
Sensor in accordance with claim 2, wherein said coil means included in said terminally closed loop means forms a magnetic field transversely of said line joining said electrodes.
Claim 5
Dependent Claim
47 words
Sensor in accordance with claim 1, wherein said deformable terminally closed loop means is flexibility resilient and is biased outwardly, whereby said loop means may be laterally contracted for percutaneous insertion into an animal body and then expanded within a biological fluid-carrying conduit of the animal body.
Claim 6
Dependent Claim
26 words
Sensor in accordance with claim 1, wherein said terminally closed loop means includes a flexible wire frame adapted to expand towards the wall of the conduit.
Claim 7
Dependent Claim
71 words
Sensor in accordance with claim 2, which includes an elongated tubular member attached to said terminally closed loop means and supporting said terminally closed loop means, wherein said electrically conductive lead means includes a first pair of electric wires respectively connected to said electrodes and extending through said elongated tubular member, and a second pair of electric wires respectively connected to said coil means and extending through said elongated tubular member.
Claim 8
Dependent Claim
31 words
Sensor in accordance with claim 6, in which said wires of said first pair cross one another within said terminally closed loop means so as to suppress unwanted transformer electromotive forces.
Claim 9
Dependent Claim
29 words
Sensor in accordance with claim 5, and which includes a drawstring attached to said frame for opening said terminally closed loop means to an expanded position within the conduit.
Claim 10
Dependent Claim
18 words
Sensor in accordance with claim 5, in which said flexible frame is flexibly resilient and is biased outwardly.
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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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |