US3570474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for quantitative indicating of small and rapid volume changes in a part of an extremity
Assignee: JAERNHS ELEKTRISKA AB
•
Filing: 1968-03-27
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Granted: 1971-03-16
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Expires: 1988-03-27
Abstract
Abstract In an apparatus for quantitative indicating of small and rapid volume changes in a part of an extremity there is provided a plethysmograph with a rigid shell and a number of pivoted rigid plates at each end of the shell partially overlapping each other. These plates at each end of the shell are enclosed in an evacuable casing and are adjustable to be sealingly engaged with the extremity together with said casing, said plates being locked in their adjusted position by the evacuation of said casing.
Inventors
- 👤 Bjorn Lars Herman Jonson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:15
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/103; A61B5/107; A61B5/1073
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
165 words
Apparatus for quantitative indicating of small and rapid volume changes in a part of an extremity comprising a plethysmograph having a rigid tubular shell adapted to be disposed about the extremity surrounding said part thereof, the volume changes of which are to be indicated, sealing means at each end of said shell adapted to seal the shell against the extremity, said sealing means comprising a diaphragm consisting of a number of rigid plates arranged circumferentially of said shell in partially overlapping relationship and adjustably connected therewith, said plates being adapted to be engaged with the extremity and a flexible covering enclosing said plates which covering is connected to said shell, and means for connecting the interior of said covering to air-evacuating means, said plates being fixedly retained in their adjusted position when the interior of said covering is evacuated, and means for connecting the interior of said shell to indicating means; and indicating means responsive to volume changes within said tubular shell of said plethysmograph.
Claim 2
Dependent Claim
165 words
Apparatus for quantitative indicating of small and rapid volume changes in a part of an extremity comprising a plethysmograph having a rigid tubular shell adapted to be disposed about the extremity surrounding said part thereof, the volume changes of which are to be indicated, sealing means at each end of said shell adapted to seal the shell against the extremity, said sealing means comprising a diaphragm consisting of a number of rigid plates arranged circumferentially of said shell in partially overlapping relationship and adjustably connected therewith, said plates being adapted to be engaged with the extremity and a flexible covering enclosing said plates which covering is connected to said shell, and means for connecting the interior of said covering to air-evacuating means, said plates being fixedly retained in their adjusted position when the interior of said covering is evacuated, and means for connecting the interior of said shell to indicating means; and indicating means responsive to volume changes within said tubular shell of said plethysmograph.
Claim 3
Dependent Claim
21 words
Apparatus as claimed in claim 1 in which said covering forms an annular sleeve adapted to be disposed around the extremity.
Claim 4
Dependent Claim
53 words
Apparatus as claimed in claim 1 in which an elastic wall is provided in said shell extending between said coverings in opposite ends of the shell to define together with said shell a fluidtight annular chamber inside the shell, said means for connecting said plethysmograph to said indicating means communicating with said chamber.
Claim 5
Dependent Claim
35 words
Apparatus as claimed in claim 1 in which said indicating means includes transducer means for sensing said volume changes and converting said volume changes to corresponding electric signals, and means for displaying said electric signals.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |