Patent US4727730A successfully refreshed from Google Patents.
US4727730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated optic system for monitoring blood pressure
Assignee: Smiths Medical ASD Inc
•
Filing: 1986-07-10
•
Granted: 1988-03-01
•
Expires: 2006-07-10
Abstract
Abstract Blood gases and the like are monitored by a single probe having multiple dye wells and dyes immobilized in the wells, the dyes being exposed to the blood gases. Optical fibers and waveguides connected to the dye wells permit light to be directed from a light source to the dyes and the light due to absorption or the spontaneous emission of the dye returned to a light detector. The intensity, phase shift or other mechanism of the returned radiation is a measure of the partial pressure of a respective blood gas.
Inventors
- 👤 Anthony A. Boiarski
- 👤 Nile F. Hartman
- 👤 Rand C. Sherman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:41
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/64; G01N21/645; A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/0215; A61B5/02154; A61B5/145; A61B5/14539; A61B5/1455; A61B5/1459; G01N21/75; G01N21/77; G01N21/7703; G01N21/6428; G01N2021/6432; G01N2021/6434; G01N2021/6484; G01N2021/7706; G01N2021/772; G01N2201/00; G01N2201/06; G01N2201/062; G01N2201/0622
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
105 words
Blood pressure monitoring apparatus comprising, a block, means defining a cavity in said block, said cavity having an opening, a resilient diaphragm overlying said opening and having an outside surface exposed to blood in a blood vessel, a diffraction grating cantilevered over said opening and engaged by said diaphragm to bend said grating into said cavity upon application of blood pressure on the outside surface of said diaphragm, means for directing a beam of light consisting of two wavelengths onto said diffraction grating, light-receiving means presenting a surface in said cavity, and means for measuring the quantity of each said wavelength impinging on said surface.
Claim 2
Dependent Claim
105 words
Blood pressure monitoring apparatus comprising, a block, means defining a cavity in said block, said cavity having an opening, a resilient diaphragm overlying said opening and having an outside surface exposed to blood in a blood vessel, a diffraction grating cantilevered over said opening and engaged by said diaphragm to bend said grating into said cavity upon application of blood pressure on the outside surface of said diaphragm, means for directing a beam of light consisting of two wavelengths onto said diffraction grating, light-receiving means presenting a surface in said cavity, and means for measuring the quantity of each said wavelength impinging on said surface.
Claim 3
Dependent Claim
49 words
Blood pressure monitoring apparatus as in claim 1 further comprising, parallel incoming and outgoing waveguides having ends extending into said cavity, means guiding incoming beams from said incoming waveguide to said diffraction grating and onto said outgoing waveguide, and optical fibers mounted between said waveguides and said measuring means.
Claim 4
Dependent Claim
102 words
Blood pressure monitoring apparatus comprising, a block having a cavity therein, a light source, first optical fibers connected between said light source and said cavity to direct light rays into said cavity, a diffraction grating overlying said cavity and being in the path of said light rays, said diffraction grating deflecting in response to variations in fluid pressure external to said block, monitoring means, second optical fibers connected between said cavity and said monitoring means and positioned to receive reflections from said diffraction grating, said monitoring means indicating variations in blood pressure dependent upon the amount of deflection of said diffraction grating.
Claim 5
Dependent Claim
102 words
Blood pressure monitoring apparatus comprising, a block having a cavity therein, a light source, first optical fibers connected between said light source and said cavity to direct light rays into said cavity, a diffraction grating overlying said cavity and being in the path of said light rays, said diffraction grating deflecting in response to variations in fluid pressure external to said block, monitoring means, second optical fibers connected between said cavity and said monitoring means and positioned to receive reflections from said diffraction grating, said monitoring means indicating variations in blood pressure dependent upon the amount of deflection of said diffraction grating.
References Cited (Backward Citations)
US3267932A
Cited
US3249105A
Cited
US3273447A
Cited
US3814081A
Cited
US3822695A
Cited
US4030485A
Cited
US4078432A
Cited
US4201222A
Cited
US4158310A
Cited
US4194217A
Cited
US4210029A
Cited
US4368645A
Cited
EP0063778A2
Cited
US4560248A
Cited
US4487206A
Cited
US4626680A
Cited
US4543961A
Cited
US4611600A
Cited
US4593701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |