US3805768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic blood flow probe
Assignee: Carolina Medical Electronics Inc
•
Filing: 1972-04-11
•
Granted: 1974-04-23
•
Expires: 1992-04-11
Abstract
Abstract An electromagnetic blood flow probe for measuring blood flow having at least two separable and connectable coil segments cooperatively connected to an appropriate switching device selectively movable from a first position where the segments are connected to form a single coil having a given polarity to a second position where the segments are connected separately with opposite polarities so that the coil segments may be energized to eliminate or reorient the flux field and reflect an electrical zero without physically terminating blood flow in a vessel.
Inventors
- 👤 C Barefoot
- 👤 Wethy J Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:34
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/026; A61B5/0265; G; G01; G01F; G01F1/00; G01F1/56; G01F1/58
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
175 words
For use in a blood flow measuring device: and electromagnetic blood flow probe having a housing, magnetic means within the housing establishing a flux field proximate blood flow and electrode means positioned within the flux field and in the housing to sense the induced voltage generated when conductive blood flows through the flux field, electrical conductor means connected to said electrode means and extending outwardly of said housing, said flux establishing means including a coil forming at least a part of said magnetic means having at least two electrically separable and connectable segments; switching means selectively movable from a first position to connect said segments to form a single coil having one polarity to a second position to connect said coil separately with opposite polarities; and a voltage source operable with that switching to energize said single coil in the first position to produce a flux field for sensing blood flow and to energize said coils in the second position, eliminate the effects of the flux field and reflect electrical zero without terminating blood flow.
Claim 2
Dependent Claim
175 words
For use in a blood flow measuring device: and electromagnetic blood flow probe having a housing, magnetic means within the housing establishing a flux field proximate blood flow and electrode means positioned within the flux field and in the housing to sense the induced voltage generated when conductive blood flows through the flux field, electrical conductor means connected to said electrode means and extending outwardly of said housing, said flux establishing means including a coil forming at least a part of said magnetic means having at least two electrically separable and connectable segments; switching means selectively movable from a first position to connect said segments to form a single coil having one polarity to a second position to connect said coil separately with opposite polarities; and a voltage source operable with that switching to energize said single coil in the first position to produce a flux field for sensing blood flow and to energize said coils in the second position, eliminate the effects of the flux field and reflect electrical zero without terminating blood flow.
Claim 3
Dependent Claim
17 words
The device as claimed in claim 1 further comprising an arcuately shaped core carrying said coil segments.
Claim 4
Dependent Claim
21 words
The device as claimed in claim 2 wherein said coil is circular to conform to the exterior of a blood vessel.
Claim 5
Dependent Claim
17 words
The device as claimed in claim 1 wherein said coil segments are positioned end-to-end within said housing.
Claim 6
Dependent Claim
16 words
The device as claimed in claim 1 wherein said coil segments are juxtaposed within said housing.
Claim 7
Dependent Claim
21 words
The device as claimed in claim 3 where said coil segments are positioned end-to-end within said housing and about said core.
Claim 8
Dependent Claim
20 words
The device as claimed in claim 3 wherein said coil segments are juxtaposed within said housing and about said core.
Claim 9
Dependent Claim
19 words
The device as claimed in claim 1 further comprising potential balancing means adapted to compensate for unwanted induced potentials.
Claim 10
Dependent Claim
18 words
A device as claimed in claim 1 and including flow meter means connected to said electrical conductor means.
Claim 11
Dependent Claim
18 words
A device as claimed in claim 9 including potential balancing means adapted to compensate for unwanted induced potentials.
References Cited (Backward Citations)
US3316762A
Cited
US3449951A
Cited
US3479871A
Cited
US3696674A
Cited
US3550446A
Cited
US3722505A
Cited
US3659591A
Cited
US3717031A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-22 | 1977-10-22 | 1978-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-22 | 1981-10-22 | 1982-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-22 | 1985-10-22 | 1986-04-23 | $7700.00 | Window Closed / Lapsed |