Patent US3733899A successfully refreshed from Google Patents.
US3733899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for measuring the flow rate of a liquid
Assignee: US Philips Corp
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Filing: 1971-05-17
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Granted: 1973-05-22
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Expires: 1991-05-17
Abstract
Abstract An improved device for regulating the flow of liquid through a conduit is described. The device is particularly useful in the regulation of blood flowing through a blood vessel. Unlike previous devices of this type the device described herein is readily usable on blood vessels situated well below the skin. The device comprises an injection duct for an auxiliary liquid which is mixable with the flowing liquid and thermocouples for measuring temperature differences, characterized in that the device is provided with means for the pulsating supply of the auxiliary liquid.
Inventors
- 👤 M Auphan
- 👤 J Perilhou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:40
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/026; A61B5/0275; A61B5/028; G; G01; G01F; G01F1/00; G01F1/704; G01F1/7044
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
175 words
A device for measuring the flow rate of liquid flowing through a channel comprising a hollow needle arranged for insertion into said channel, an injection duct carried within said needle and extending into said channel, a supply of auxiliary liquid at a temperature different from the temperature of the liquid flowing in said channel connected to said duct so that said auxiliary liquid will enter said channel, means connected to said supply means for pulsing said auxiliary liquid into said injection duct so that said liquid enters said channel in pulses so as to thoroughly mix with the liquid flowing in said channel, a first temperature sensitive element arranged for sensing the temperature of said auxiliary liquid, a second temperature sensitive element arranged for sensing the temperature of said mixture of liquids, a third temperature sensitive element for sensing the temperature of the liquid flowing in said channel, and means connected to said temperature sensitive elements for measuring the difference between said first and second temperatures and the difference between said second and third temperatures.
Claim 2
Independent Claim
175 words
A device for measuring the flow rate of liquid flowing through a channel comprising a hollow needle arranged for insertion into said channel, an injection duct carried within said needle and extending into said channel, a supply of auxiliary liquid at a temperature different from the temperature of the liquid flowing in said channel connected to said duct so that said auxiliary liquid will enter said channel, means connected to said supply means for pulsing said auxiliary liquid into said injection duct so that said liquid enters said channel in pulses so as to thoroughly mix with the liquid flowing in said channel, a first temperature sensitive element arranged for sensing the temperature of said auxiliary liquid, a second temperature sensitive element arranged for sensing the temperature of said mixture of liquids, a third temperature sensitive element for sensing the temperature of the liquid flowing in said channel, and means connected to said temperature sensitive elements for measuring the difference between said first and second temperatures and the difference between said second and third temperatures.
Claim 3
Dependent Claim
55 words
The device as claimed in claim 1 wherein said means for pulsing said liquid comprises a pulsating pump connected at one side to an inlet valve which is connected to said supply of auxiliary liquid, and said pump being connected at its other side to an outlet valve which is connected to said injection duct.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |