US5217013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Patient sensor for optical cerebral oximeter and the like
Assignee: Somanetics LLC
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Filing: 1991-06-06
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Granted: 1993-06-08
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Expires: 2011-06-06
Abstract
Abstract A sensor for use in medical patient examination and monitoring by spectrophotometric apparatus, including a main body having a soft, resilient outer cover on at least one side for conformably contacting a selected area on the patient, in particular the forehead, also having and an electro-optical light source and a plurality of electro-optical light detectors spaced from the source and from one another, and exposed to the selected site on the patient by light-transmissive passages extending through the resilient cover, in which the resilient cover is formed of a thin, softly compressible member of light-absorbing and moisture-transmissible material, preferably of resilient cellular polymeric foam.
Inventors
- 👤 Gary D. Lewis
- 👤 Peter H. Klose
- 👤 Wayne P. Messing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:09
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/68; A61B5/6801; A61B5/6813; A61B5/6814; A61B5/0059; A61B5/0082; A61B5/0091; A61B5/02; A61B5/024; A61B5/02416; A61B5/02427; A61B5/02433; A61B5/145; A61B5/1455; A61B5/14551; A61B5/14552; A61B5/14553; A61B5/43; A61B5/4306; A61B5/4312
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
237 words
An optical sensor unit for use as a patient interface device in conducting in vivo spectrophotometric examination procedures, comprising in combination: a body having at least limited longitudinal flexibility and a softly resilient outer cover carried on at least one side, for comfortably and contiguously contacting a selected surface area on a patient; an electro-optical light source carried with said body and exposed through said resilient cover, for emitting light of at least two selected wavelengths and introducing such light into said patient through said surface area; a plurality of electro-optical light detectors carried with said body and maintained at particular spacings from one another and from said light source thereby, said detectors being exposed through said resilient cover to receive light from said patient resulting from said introduced light from said source; electrical conductors coupled to said light source and light detectors to energize said source and to convey output signals from said detectors representative of the resultant light received from said patent, said conductors extending outwardly from said body for coupling to a remotely located signal-processing device; said resilient cover comprising a thin, softly compressible member of light-absorbing and moisture-transmissible material which helps isolate said source from said detectors with respect to light traveling directly therebetween as well as from ambient light while also acting to convey moisture away from said patient surface area, to enhance the fidelity and accuracy of said detector output signals.
Claim 2
Dependent Claim
237 words
An optical sensor unit for use as a patient interface device in conducting in vivo spectrophotometric examination procedures, comprising in combination: a body having at least limited longitudinal flexibility and a softly resilient outer cover carried on at least one side, for comfortably and contiguously contacting a selected surface area on a patient; an electro-optical light source carried with said body and exposed through said resilient cover, for emitting light of at least two selected wavelengths and introducing such light into said patient through said surface area; a plurality of electro-optical light detectors carried with said body and maintained at particular spacings from one another and from said light source thereby, said detectors being exposed through said resilient cover to receive light from said patient resulting from said introduced light from said source; electrical conductors coupled to said light source and light detectors to energize said source and to convey output signals from said detectors representative of the resultant light received from said patent, said conductors extending outwardly from said body for coupling to a remotely located signal-processing device; said resilient cover comprising a thin, softly compressible member of light-absorbing and moisture-transmissible material which helps isolate said source from said detectors with respect to light traveling directly therebetween as well as from ambient light while also acting to convey moisture away from said patient surface area, to enhance the fidelity and accuracy of said detector output signals.
Claim 3
Dependent Claim
122 words
The optical sensor unit as recited in claim 1, further including means for shielding said light detectors and at least portions of their said electrical conductors from ambient sources of electrical noise and/or like distortion, to help maintain the fidelity of said signals to the detected representative light; said shielding means including at least one thin layer of lightly flexible and longitudinally resilient, electrically conductive sheet metal, said layer overlying said body throughout the portion thereof carrying said detectors to provide a shielding for them and the immediately adjacent electrical conductors to which they are directly coupled; wherein said thin layer of said sheet metal is disposed on the inside of said body and extends alongside at least portions of said detectors.
Claim 4
Dependent Claim
31 words
The optical sensor unit as recited in claim 2, wherein said means for shielding further includes a sheath substantially surrounding at least portions of said conductors extending outward beyond said body.
Claim 5
Dependent Claim
20 words
The optical sensor unit as recited in claim 3, wherein said thin sheet member is electrically coupled to said sheath.
Claim 6
Dependent Claim
60 words
The optical sensor unit as recited in claim 2, wherein said body includes a circuit board underlying and supporting said detectors, said circuit board comprising a generally planar member carrying electrically-conductive strips comprising at least in part said conductors coupled to said detectors, said thin sheet metal shielding member overlying at least portions of said circuit board adjacent said detectors.
Claim 7
Dependent Claim
37 words
The optical sensor unit as recited in claim 5, wherein said means for shielding includes a thin sheet-like member which substantially envelopes said circuit board and is disposed in juxtaposition to at least portions of said detectors.
Claim 8
Dependent Claim
34 words
The optical sensor unit as recited in claim 6, wherein said thin sheet-like shielding member overlies the side of said circuit board carrying said detectors and is apertured to expose the latter for operation.
Claim 9
Dependent Claim
27 words
The optical sensor unit as recited in claim 5, wherein said thin sheet member is substantially coextensive with and overlies said circuit board and said conductive strips.
Claim 10
Dependent Claim
42 words
The optical sensor unit as recited in claim 8, wherein said means for shielding further includes a sheath surrounding at least portions of said conductors extending outwardly from said body, and wherein said thin sheet member is electrically coupled to said sheath.
Claim 11
Dependent Claim
31 words
The optical sensor unit as recited in claim 5, wherein said shielding means comprises a sheet of conductive foil wrapped about and substantially enveloping said circuit board and its conductor strips.
Claim 12
Dependent Claim
33 words
The optical sensor unit as recited in claim 1, wherein said light detectors comprise photodiodes having a sensitivity on the order of about 500 milliamps per watt, and are of a low-noise type.
Claim 13
Dependent Claim
38 words
The optical sensor unit as recited in claim 1, wherein said light source comprises at least one L.E.D. having an output on the order of about three milliwatts and an output light solid angle of about ninety degrees.
Claim 14
Dependent Claim
27 words
The optical sensor unit as recited in claim 1, wherein said amplifier unit is located at least three feet away from said electro-optical light source and detectors.
Claim 15
Dependent Claim
88 words
The optical sensor unit as recited in claim 1, wherein said source and said detectors comprise low-power components requiring only low levels of current and voltage essentially negligible to human comfort and safety; and electric signal amplification means coupled to receive said output signals from said light detectors via their said electrical conductors for amplification of said signals prior to processing thereof, said amplification means comprising an amplifier unit which is physically located between said patient and said signal-processing device, to protect said patient from higher power levels.
Claim 16
Dependent Claim
62 words
The optical sensor unit as recited in claim 1, wherein said body further includes a flexible sheet disposed on the rearward side thereof opposite the cover contacting said patient, to sandwich at least portions of said electro-optical source and detectors therebetween, said sheet being of light-reflective material and generally opaque in nature to further isolate said source and detectors from ambient light.
Claim 17
Dependent Claim
20 words
The optical sensor unit as recited in claim 1, wherein said cover comprises a resilient foam material having vapor-transmissive characteristics.
Claim 18
Dependent Claim
16 words
The optical sender-receiver unit as recited in claim 16, wherein said foam is of open-cell form.
Claim 19
Dependent Claim
19 words
The optical sender-receiver unit as recited in claim 16, wherein said foam is black in color and highly light-absorbing.
References Cited (Backward Citations)
US4321930A
Cited
US4380240A
Cited
US4510938A
Cited
US4865038A
Cited
US4880304A
Cited
US4819752A
Cited
US4825879A
Cited
US5094240A
Cited
WO1989009566A1
Cited
US4964408A
Cited
US5111817A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-07 | 1996-12-07 | 1997-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-07 | 2000-12-07 | 2001-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-07 | 2004-12-07 | 2005-06-08 | $7700.00 | Window Closed / Lapsed |