Patent US4538618A successfully refreshed from Google Patents.
US4538618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid flow detector particularly useful for microvascular monitoring
Assignee: Individual
•
Filing: 1984-02-23
•
Granted: 1985-09-03
•
Expires: 2004-02-23
Abstract
Abstract A fluid flow detector for the non-invasive detection of fluid flow particularly useful for microvascular monitoring comprises a head adapted to be placed against the object through which the fluid flows, a Doppler fluid flow sensor carried by the head, and a pressure transducer carried by the head for measuring the pressure applied thereby against the object.
Inventors
- 👤 Lior Rosenberg
- 👤 Jonathan Molcho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:28
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/03; A61B5/0059; A61B5/02; A61B5/026
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
75 words
A fluid flow detector for the non-invasive detection of the flow of a fluid through an object, which detector is particularly useful for microvascular monitoring, comprising: a head adapted to be placed against the object; fluid-flow sensing means carried by said head for sensing the flow of fluid through the object when the head is applied against it; and pressure transducer means carried by said head for measuring the pressure applied thereby against the object.
Claim 2
Dependent Claim
75 words
A fluid flow detector for the non-invasive detection of the flow of a fluid through an object, which detector is particularly useful for microvascular monitoring, comprising: a head adapted to be placed against the object; fluid-flow sensing means carried by said head for sensing the flow of fluid through the object when the head is applied against it; and pressure transducer means carried by said head for measuring the pressure applied thereby against the object.
Claim 3
Dependent Claim
17 words
The detector according to claim 1, wherein said fluid-flow sensing means senses fluid-flow by the Doppler effect.
Claim 4
Dependent Claim
45 words
The detector according to claim 2, wherein said fluid-flow sensing means comprises a device carried by the head adapted to be coupled at one end to a transmitter and receiver of high frequency waves so as to measure the fluid flow by the Doppler effect.
Claim 5
Dependent Claim
30 words
The detector according to claim 3, wherein said device includes an optical fiber for guiding laser light from the transmitter to the object, and from the object to the receiver.
Claim 6
Dependent Claim
30 words
The detector according to claim 3, wherein said device is an ultrasonic waveguide for guiding ultrasonic sound from the transmitter to the object, and from the object to the receiver.
Claim 7
Dependent Claim
53 words
The detector according to claim 3, wherein said device is carried by the head so as to be displaced within the head in accordance with the pressure applied thereby to the object, said pressure transducer means including means for measuring the magnitude of said displacement and thereby producing a measurement of said pressure.
Claim 8
Dependent Claim
53 words
The detector according to claim 6, wherein said device is carried by a plunger displaceable within the head against the action of a spring, said pressure transducer means including an iron core displaceable with said device, and an electrical coil fixed within the head to sense the magnitude of displacement of the core.
Claim 9
Dependent Claim
24 words
The detector according to claim 3, wherein said device is fixed within said head, and said pressure transducer means is of the non-displaceable type.
Claim 10
Dependent Claim
27 words
The detector according to claim 8, wherein said pressure transducer means is disposed so as to directly sense the pressure applied by the head against the object.
Claim 11
Dependent Claim
27 words
The detector according to claim 8, wherein said pressure transducer means is disposed so as to directly sense the pressure applied by said device against the object.
Claim 12
Dependent Claim
17 words
The detector according to claim 8, wherein said pressure transducer means is of the piezoelectric crystal type.
References Cited (Backward Citations)
US3391691A
Cited
US3920004A
Cited
US4079730A
Cited
US4127114A
Cited
US4249540A
Cited
DE2823392A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |