US3580071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flowmeter probe
Assignee: Gould Inc
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Filing: 1969-02-26
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Granted: 1971-05-25
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Expires: 1989-02-26
Abstract
Abstract An insulative hollow cylindrical tube of inner bore sufficient to accommodate a blood vessel under test, has a longitudinal wedge-shaped portion that is removable to provide an access opening. A first magnetizing coil includes a core that extends circumferentially about the insulative cylinder of substantial angular extent. A second coil has a core extending in the same direction, but of substantially less angular extent than the core of the first coil. The two coils are serially related and energized to induce a potential in the flowing blood which is measured by electrodes carried by the insulative cylinder. The entire assembly is enclosed with a further cover cylinder concentrically arranged about the first coil and end plates. The present invention relates generally to a blood flowmeter, and, more particularly, to a probe for mounting about a blood vessel to measure the flow rate of blood passing therethrough.
Inventors
- 👤 Norman A Hickman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:09
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/68; A61B5/6846; A61B5/6867; A61B5/6876; A61B5/02; A61B5/026; A61B5/0265; A61B5/6879; A61B5/6884; G; G01; G01F; G01F1/00; G01F1/56; G01F1/58
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
100 words
In a probe for measuring fluid flow rate through a conduit having magnetic field generating means and electrodes across which potential differences induced in the fluid by the magnetic field exist, said field-generating means and electrodes being integrally related in a housing having an access opening therein for removable mounting onto the conduit, the improvement comprising: the field-generating means including first and second magnetic cores with respectively separate windings, said cores being disposed closely adjacent the conduit outer surface and so located that the core axes intersect one another at the conduit centerline at an angle less than 180* .
Claim 2
Dependent Claim
100 words
In a probe for measuring fluid flow rate through a conduit having magnetic field generating means and electrodes across which potential differences induced in the fluid by the magnetic field exist, said field-generating means and electrodes being integrally related in a housing having an access opening therein for removable mounting onto the conduit, the improvement comprising: the field-generating means including first and second magnetic cores with respectively separate windings, said cores being disposed closely adjacent the conduit outer surface and so located that the core axes intersect one another at the conduit centerline at an angle less than 180* .
Claim 3
Dependent Claim
38 words
In a probe as in claim 1, in which the cores are elongate, with the long dimensions thereof extending circumferentially about the conduit and the resultant magnetic vector for each core is substantially 90* to the conduit surface.
Claim 4
Dependent Claim
29 words
In a probe as in claim 2, in which the cores are arcuate along their long dimensions thereby conforming to and in continuous contact with the conduit outer surface.
Claim 5
Dependent Claim
61 words
In a probe as in claim 2, in which the first core subtends an angle at the conduit center above about 90* and the second core subtends an angle substantially less than 90* said cores being spaced along the same general circumferential line as to direct magnetic flux through the conduit over a total angular extent less than about 180* .
Claim 6
Dependent Claim
28 words
In a probe as in claim 1, in which the electrodes are two in number, respectively located between the two cores and generally diametrically opposed to one another.
Claim 7
Dependent Claim
77 words
A probe for being received onto a fluid-carrying conduit for measuring fluid velocity therethrough comprising: a hollow insulative tube, the bore of which is sufficient to receive the conduit; said tube including a removable section forming an access opening via which the tube is received onto the conduit; and first and second magnetic core pieces of substantially different cross-sectional areas affixed to the outer surface of said insulative tube, each core piece provided with separate energizing windings.
Claim 8
Dependent Claim
77 words
A probe for being received onto a fluid-carrying conduit for measuring fluid velocity therethrough comprising: a hollow insulative tube, the bore of which is sufficient to receive the conduit; said tube including a removable section forming an access opening via which the tube is received onto the conduit; and first and second magnetic core pieces of substantially different cross-sectional areas affixed to the outer surface of said insulative tube, each core piece provided with separate energizing windings.
Claim 9
Dependent Claim
25 words
A probe as in claim 6, in which the cores and associated windings are enclosed within a housing that is unitarily related to the tube.
Claim 10
Dependent Claim
52 words
A proBe as in claim 6, in which the cores each have a long dimension substantially greater than its height, said cores being shaped so that the long dimensions extend circumferentially about the conduit and conform to the tube exterior, said windings encompassing the cores about the sides forming the core height.
Claim 11
Dependent Claim
52 words
A probe as in claim 8, in which a first core long dimension subtends an angle of substantially 90* and the second core long dimension subtends an angle substantially less than 90* , said cores being circumferentially spaced from one another encompassing a total subtended angle of not more than 180* .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |