US3628526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Physiologic fluid pressure sensor head
Assignee: EIDP Inc
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Filing: 1969-04-14
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Granted: 1971-12-21
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Expires: 1989-04-14
Abstract
Abstract A pressure sensing head for measuring physiologic fluid pressure through an elastic body membrane, which is composed of: a membrane depressor-element with a membrane-depressing face adapted to engage the surface of the membrane; a supporting structure containing a pressure-development cavity, a port for introducing gas under pressure into the pressure-development cavity and a port for measuring the gas pressure developed within the pressure-development cavity; and a feedback chamber formed in the supporting structure and adapted in a manner such that the depressor-element is free to move relative to the supporting structure to vary the free volume of the feedback chamber. The feedback chamber is either an integral part of or connected to the pressure-development cavity and is connected through a passage in the depressor element to the membrane-depressing face of the depressor element. The membrane-depressing face is adapted so that the gas introduced into the pressure-development cavity will be discharged into the atmosphere in a manner such that the discharging gas is throttled by the disposition of the membrane relative to the membrane-depressing face.
Inventors
- 👤 Robert P Bigliano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:07
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/16; A61B5/00; A61B5/02; A61B5/021
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
134 words
In a pressure sensing head for measuring fluid pressure through a membrane including: a supporting structure containing a pressure-development cavity; means for introducing gas at a substantially fixed rate of flow into said cavity; means for measuring the gas pressure in said cavity; and a membranedepressor element supported by said supporting structure, said membrane-depressor element having a membrane-depressing face with a flow throttling opening in its surface and a passage connecting said flow throttling opening with said cavity; the improvement comprising a variable volume feedback chamber within said supporting structure formed by said membrane-depressor element and said pressure-development cavity, said membrane-depressor element being movably supported by said supporting structure so that the volume of said feedback cavity is varied by the motion of said membrane-depressor element substantially perpendicular to the surface of said membrane.
Claim 2
Dependent Claim
134 words
In a pressure sensing head for measuring fluid pressure through a membrane including: a supporting structure containing a pressure-development cavity; means for introducing gas at a substantially fixed rate of flow into said cavity; means for measuring the gas pressure in said cavity; and a membranedepressor element supported by said supporting structure, said membrane-depressor element having a membrane-depressing face with a flow throttling opening in its surface and a passage connecting said flow throttling opening with said cavity; the improvement comprising a variable volume feedback chamber within said supporting structure formed by said membrane-depressor element and said pressure-development cavity, said membrane-depressor element being movably supported by said supporting structure so that the volume of said feedback cavity is varied by the motion of said membrane-depressor element substantially perpendicular to the surface of said membrane.
Claim 3
Dependent Claim
39 words
The pressure sensing head of claim 1 wherein said supporting structure comprises a projection coacting with the sides of said membrane-depressor element to restrict its motion to motion in a direction perpendicular to the plane of said membrane-depressing face.
Claim 4
Dependent Claim
72 words
The pressure sensing head of claim 1 wherein said membrane-depressing face is provided with an annular depression concentric with said flow throttling opening and separated therefrom by an annular ridge, the surface of said ridge being recessed from the surface of said membrane-depressing face, and said membrane-depressor element is provided with at least one gas escape port connecting said annular depression to the atmosphere at a point removed from said membrane-depressing face.
Claim 5
Dependent Claim
63 words
The pressure sensing head of claim 1 wherein: a. said membrane-depressor element further comprises a substantially cylindrical support tube supporting said membrane-depressing face and b. said supporting structure comprises a projection coacting with the sides of said cylindrical support tube in a substantially friction free arrangement to restrict its motion to motion in a direction perpendicular to the plane of said membrane-depressing face.
Claim 6
Dependent Claim
163 words
The pressure sensing head of claim 4 wherein: a. said membrane-depressor element further comprises a disc supported by said support tube and containing said membrane-depressing face, said membrane-depressing face being provided with an annular depression concentric with said flow throttling opening and separated therefrom by an annular ridge, the surface of said annular ridge being recessed from the surface of said membrane-depressing face, said disc being further provided with at least one gas-escape port connecting said annular depression to the atmosphere at the rear of said disc; and b. said supporting structure comprises a first body part containing said cavity and a second body part, in the form of the frustum of a hollow cone, said second body part being supported by said first body part and the narrowest portion of said second body part coacting with said support tube in a substantially friction free arrangement to restrict its Motion to motion in a direction perpendicular to the plane of said membrane-depressing face.
Claim 7
Dependent Claim
69 words
The pressure sensing head of claim 5 wherein said support tube comprises a rigid part and a flexible part connecting said disc to said rigid part, and wherein the second body part of said supporting structure comprises a projection coacting with the rigid part of said support tube to substantially restrict motion of said membrane-depressor element to motion in a direction perpendicular to the plane of said membrane-depressing face.
Claim 8
Dependent Claim
98 words
The pressure sensing head of claim 1 wherein said supporting structure comprises an annular flange extending from said supporting structure, and a flexible diaphragm supported in a substantially leaktight arrangement at its periphery by said annular flange to form said feedback chamber between said diaphragm and said supporting structure, said membrane-depressor element being supported by said diaphragm in a substantially leaktight arrangement, and said diaphragm being provided with an opening connecting said cavity to the passage in said membrane-depressor element, whereby movement of said membrane-depressor element varies the volume of said feedback chamber by deformation of said diaphragm.
Claim 9
Dependent Claim
22 words
The pressure sensing head of claim 7 wherein said membrane-depressor element comprises a flexible, substantially cylindrical support tube supporting said membrane-depressing face.
Claim 10
Dependent Claim
62 words
The pressure sensing head of claim 8 wherein said membrane-depressor element further comprises a rigid sleeve surrounding said flexible support tube over a portion of its length and wherein said supporting structure comprises a projection coacting with said rigid sleeve to substantially restrict the motion of said membrane-depressor element to motion in a direction perpendicular to the plane of said membrane-depressing face.
Claim 11
Dependent Claim
40 words
The pressure sensing head of claim 7 wherein said supporting structure comprises a projection coacting with the sides of said membrane-depressor element to restrict its motion to motion in a direction substantially perpendicular to the plane of said membrane-depressing face.
Claim 12
Dependent Claim
53 words
The pressure sensing head of claim 7 wherein said diaphragm has an annular deformation circumscribing the opening in its center, extending away from said feedback chamber, said deformation having an external diameter less than the diameter of said feedback chamber and an internal diameter greater than the external diameter of said membrane-depressor element.
Claim 13
Dependent Claim
140 words
The pressure sensing head of claim 7 wherein: a. said membrane-depressor element comprises a disc containing said membrane-depressing face and a substantially cylindrical support tube supporting said disc, said membrane-depressing face being provided with an annular depression concentric with said flow throttling opening and separated therefrom by an annular ridge, the surface of said ridge being recessed from the surface of said membrane-depressing face, and said disc having at least one gas-escape port connecting said annular depression to the atmosphere at the rear of said disc; and b. said supporting structure further comprises a restraining means in the form of the frustum of a hollow cone, the narrowest portion of the frustum coacting with said membrane-depressor element in a substantially friction free arrangement to restrict its motion to motion in a direction perpendicular to the plane of said membrane-depressing face.
References Cited (Backward Citations)
US3150521A
Cited
US3099262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |