US4022190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for sensing pressure
Assignee: Hittman Corp
•
Filing: 1974-07-16
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Granted: 1977-05-10
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Expires: 1994-07-16
Abstract
Abstract A pressure sensor apparatus primarily for sensing pressure in a body cavity such as the cranium, bladder or vena cava of an animal or human comprising a housing having a diaphragm dividing the interior of the housing into two chambers. A member containing filter material is connected to the housing and communicates with one of the chambers formed in the housing. The other chamber contains radioactive fluid and is connected to a variable volume chamber that receives a volume of radioactive fluid which is proportional to the pressure sensed by the flexible member. A radiation detector senses the volume of radioactive fluid in the variable volume chamber.
Inventors
- 👤 Glenn A. Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:20
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/03; A61B5/031; G; G01; G01L; G01L11/00
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
126 words
A fluid pressure sensor apparatus comprising a housing, a first resilient means dividing said housing into first and second chambers, fluid communication means for placing said first chamber in fluid communication with the fluid whose pressure is to be sensed so that the pressure of said fluid will cause said first resilient means to move, filter means associated with said fluid communication means for preventing particulate matter in said fluid from entering said first chamber, second resilient means in fluid communication with said second chamber, and a radioactive fluid contained within said second chamber and being in fluid communication with said second resilient means, said radioactive fluid being transferred from said second chamber as a function of the fluid pressure acting upon said first resilient means.
Claim 2
Dependent Claim
126 words
A fluid pressure sensor apparatus comprising a housing, a first resilient means dividing said housing into first and second chambers, fluid communication means for placing said first chamber in fluid communication with the fluid whose pressure is to be sensed so that the pressure of said fluid will cause said first resilient means to move, filter means associated with said fluid communication means for preventing particulate matter in said fluid from entering said first chamber, second resilient means in fluid communication with said second chamber, and a radioactive fluid contained within said second chamber and being in fluid communication with said second resilient means, said radioactive fluid being transferred from said second chamber as a function of the fluid pressure acting upon said first resilient means.
Claim 3
Dependent Claim
20 words
The apparatus of claim 1 in which said second resilient means acts to at least partially define a third chamber.
Claim 4
Dependent Claim
20 words
The apparatus of claim 2 in which said housing acts to define at least a portion of said third chamber.
Claim 5
Dependent Claim
23 words
The apparatus of claim 2 and further comprising a second housing which acts to define at least a portion of said third chamber.
Claim 6
Dependent Claim
65 words
The apparatus of claim 4 in which said second housing has at least one convoluted surface and said second resilient means comprises a convoluted diaphragm associated with said second housing and having its convolutions adapted to snugly fit in the convolutions of said convoluted surface, said convoluted diaphragm being adapted to move away from the convolutions of said convoluted surface to form said third chamber.
Claim 7
Dependent Claim
15 words
The apparatus of claim 1 in which said first resilient means is a convoluted diaphragm.
Claim 8
Dependent Claim
14 words
The apparatus of claim 1 in which said fluid communication means comprises a tube.
Claim 9
Dependent Claim
41 words
The apparatus of claim 1 in which said filter means comprises a porous material which is compatible with body tissue and will permit the transmission of body fluid but will prevent the passage of particulate matter present in said body fluid.
Claim 10
Dependent Claim
13 words
The apparatus of claim 1 in which said radioactive fluid is promethium 145.
Claim 11
Dependent Claim
15 words
The apparatus of claim 1 in which said second chamber has radiation shielding associated therewith.
Claim 12
Dependent Claim
26 words
The apparatus of claim 1 in which said second resilient means has means associated therewith so that said apparatus is insensitive to changes in ambient pressure.
Claim 13
Dependent Claim
52 words
In a pressure sensor apparatus for sensing fluid pressure in a body cavity, the improvement comprising fluid communication means for placing said pressure sensor apparatus in communication with the fluid whose pressure is to be sensed and filter means associated with said fluid communication means for filtering particulate matter in said fluid.
Claim 14
Dependent Claim
52 words
In a pressure sensor apparatus for sensing fluid pressure in a body cavity, the improvement comprising fluid communication means for placing said pressure sensor apparatus in communication with the fluid whose pressure is to be sensed and filter means associated with said fluid communication means for filtering particulate matter in said fluid.
Claim 15
Dependent Claim
14 words
The apparatus of claim 12 in which said pressure communication means comprises a tube.
Claim 16
Dependent Claim
22 words
The apparatus of claim 13 in which said filter means comprises filter material capable of filtering particulate matter above about 5 micron.
Claim 17
Dependent Claim
107 words
A pressure sensor apparatus comprising a housing, resilient means dividing said housing into first and second chambers, fluid communication means for placing said first chamber in communication with the fluid whose pressure is to be sensed so that the pressure of said fluid will cause said resilient means to move, filter means associated with said fluid communication means for preventing particulate matter in said fluid from entering said first chamber, and a radioactive material contained within at least said second chamber, said radioactive material being associated with said resilient means so that it is moved as a function of the fluid pressure acting upon said resilient means.
Claim 18
Dependent Claim
107 words
A pressure sensor apparatus comprising a housing, resilient means dividing said housing into first and second chambers, fluid communication means for placing said first chamber in communication with the fluid whose pressure is to be sensed so that the pressure of said fluid will cause said resilient means to move, filter means associated with said fluid communication means for preventing particulate matter in said fluid from entering said first chamber, and a radioactive material contained within at least said second chamber, said radioactive material being associated with said resilient means so that it is moved as a function of the fluid pressure acting upon said resilient means.
Claim 19
Dependent Claim
79 words
In a pressure sensor apparatus for sensing fluid pressure in a body cavity, the improvement comprising an elastomeric tube for placing said pressure sensor apparatus in communication with the fluid whose pressure is to be sensed and filter material which is compatible with body tissue and will permit the transmission of body fluid filling the end of the tube for filtering particulate matter in said fluid, said filter material being capable of filtering particulate matter above about 5 micron.
Claim 20
Dependent Claim
79 words
In a pressure sensor apparatus for sensing fluid pressure in a body cavity, the improvement comprising an elastomeric tube for placing said pressure sensor apparatus in communication with the fluid whose pressure is to be sensed and filter material which is compatible with body tissue and will permit the transmission of body fluid filling the end of the tube for filtering particulate matter in said fluid, said filter material being capable of filtering particulate matter above about 5 micron.
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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) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |