US4429700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blood pressure measuring device
Assignee: USPHILIPS Corp A CORP OF DE
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Filing: 1981-02-02
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Granted: 1984-02-07
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Expires: 2001-02-02
Abstract
Abstract An inflatable blood pressure cuff is pressurized with a vapor which is produced by heating a fluid which has a boiling point between 290° K. and 340° K. with an electric heating element. The heating element may comprise a PTC resistor which is disposed within the fluid. A piezoresistive element may also be disposed in the fluid to detect pressure pulses associated with Korotkoff sound.
Inventors
- 👤 Richard Thees
- 👤 Rolf Wilden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:03
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/022; A61B5/02208; A61B5/02141
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
76 words
A blood pressure measuring device comprising: cuff means which function to apply pressure to a body part; fluid reservoir means which communicate with the interior of the cuff; a liquid having a boiling point between 290° K. and 340° K. disposed in the reservoir means; means for measuring pressure in the cuff; electric heating means disposed in the liquid which function to heat the liquid above its boiling point to increase vapor pressure in the cuff.
Claim 2
Dependent Claim
76 words
A blood pressure measuring device comprising: cuff means which function to apply pressure to a body part; fluid reservoir means which communicate with the interior of the cuff; a liquid having a boiling point between 290° K. and 340° K. disposed in the reservoir means; means for measuring pressure in the cuff; electric heating means disposed in the liquid which function to heat the liquid above its boiling point to increase vapor pressure in the cuff.
Claim 3
Dependent Claim
17 words
A blood pressure measuring device as claimed in claim 1, characterized in that the liquid comprises diethylether.
Claim 4
Dependent Claim
17 words
A blood pressure measuring device as claimed in claim 1, characterized in that the liquid comprises acetone.
Claim 5
Dependent Claim
19 words
A blood pressure measuring device as claimed in claim 1, characterized in that the liquid comprises a fluorinated hydrocarbon.
Claim 6
Dependent Claim
20 words
A blood pressure measuring device as claimed in claim 1, characterized in that the heating means comprises a PTC resistor.
Claim 7
Dependent Claim
63 words
A blood pressure measuring device as claimed in claim 1, characterized in that the means for measuring the pressure in the cuff comprises a temperature sensor for measuring the temperature of the liquid, a memory means for storing the temperature/vapour pressure characteristic of the liquid, and means for determining the vapour pressure associated with said liquid temperature from said stored temperature/vapour pressure characteristic.
Claim 8
Dependent Claim
20 words
A blood pressure measuring device as claimed in claim 6, characterized in that the temperature sensor comprises a PTC resistor.
Claim 9
Dependent Claim
28 words
A blood pressure measuring device as claimed in claim 1, further comprising a piezo-resistive element disposed in the liquid to detect the pressure variations caused by Korotkoff sounds.
References Cited (Backward Citations)
US3224435A
Cited
SU728835A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-06 | 1987-08-08 | 1988-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-06 | 1991-08-08 | 1992-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-06 | 1995-08-08 | 1996-02-07 | $7700.00 | Window Closed / Lapsed |