Patent US6113637A successfully refreshed from Google Patents.
US5066859A
Expired / Lapsed
US
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Hematocrit and oxygen saturation blood analyzer
Assignee: US ALCOHOL TESTING OF AMERICA Inc
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Filing: 1990-05-18
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Granted: 1991-11-19
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Expires: 2010-05-18
Abstract
Abstract An improved blood analyzing device is disclosed for measuring the hematocrit and oxygen saturation levels of a quantity of blood. The device comprises a housing having a carriage assembly electrically interfaced thereto. Disposed within the carriage assembly is a light emitting means and a plurality of light detecting optical sensors which are used to provide hematocrit and oxygen saturation signals based on the scattering of light within a blood containment vessel disposed within the carriage. Signals generated from the sensors are processed by control electronics disposed within the housing so as to output a hematocrit measurement which is compensated for the effects of oxygen saturation, pH, and temperature, and an oxygen saturation measurement which is compensated for the effects of hematocrit, pH, and temperature.
Inventors
- 👤 Maurice N. Karkar
- 👤 James C. Velnosky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:53
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/49; G01N21/51; G01N33/00; G01N33/48; G01N33/483; G01N33/487; G01N33/49; G01N33/4925; G01N15/00; G01N15/04; G01N15/05; G01N2015/055; G01N21/25; G01N21/31; G01N21/314; G01N2021/3181; G01N2021/4704; G01N2021/4709; G01N35/00; G01N35/10; G01N2035/1027; G01N2035/1048; G01N2035/1062
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
275 words
An apparatus for measuring hematocrit and oxygen saturation levels of a volume of blood, comprising: a housing including a key pad and display panel thereon; a receptacle sized to store a quantity of blood therein; a carriage electrically connected to said housing, said carriage being sized and configured to receive and support said receptacle; a light source disposed adjacent said carriage, said light source being operative to illuminate said quantity of blood within said receptacle with first and second wavelengths of light; a first sensing means disposed adjacent said carriage for producing a hematocrit signal as a function of said first wavelength of light after scattering thereof by said blood; a second sensing means disposed adjacent said carriage for producing an oxygen saturation signal as a function of said first and said second wavelengths of light after scattering thereof by said blood; a third sensing means disposed adjacent said carriage for producing a calibration signal for the purpose of calibrating said apparatus; and a signal processing means disposed within said housing, said signal processing means comprising: (a) means for filtering said hematocrit signal and said oxygen saturation signal from system noise and outside interference; (b) means for producing an adjusted hematocrit signal and an adjusted oxygen saturation signal, said adjusted hematocrit signal comprising said hematocrit signal as compensated for effects of oxygen saturation, temperature, and blood pH and said adjusted oxygen saturation signal comprising said oxygen saturation signal as compensated for effects of hematocrit, temperature, and blood pH; and (c) means for converting said adjusted hematocrit signal and said adjusted oxygen saturation signal to hematocrit and oxygen saturation measurements for output on said display panel.
Claim 2
Independent Claim
275 words
An apparatus for measuring hematocrit and oxygen saturation levels of a volume of blood, comprising: a housing including a key pad and display panel thereon; a receptacle sized to store a quantity of blood therein; a carriage electrically connected to said housing, said carriage being sized and configured to receive and support said receptacle; a light source disposed adjacent said carriage, said light source being operative to illuminate said quantity of blood within said receptacle with first and second wavelengths of light; a first sensing means disposed adjacent said carriage for producing a hematocrit signal as a function of said first wavelength of light after scattering thereof by said blood; a second sensing means disposed adjacent said carriage for producing an oxygen saturation signal as a function of said first and said second wavelengths of light after scattering thereof by said blood; a third sensing means disposed adjacent said carriage for producing a calibration signal for the purpose of calibrating said apparatus; and a signal processing means disposed within said housing, said signal processing means comprising: (a) means for filtering said hematocrit signal and said oxygen saturation signal from system noise and outside interference; (b) means for producing an adjusted hematocrit signal and an adjusted oxygen saturation signal, said adjusted hematocrit signal comprising said hematocrit signal as compensated for effects of oxygen saturation, temperature, and blood pH and said adjusted oxygen saturation signal comprising said oxygen saturation signal as compensated for effects of hematocrit, temperature, and blood pH; and (c) means for converting said adjusted hematocrit signal and said adjusted oxygen saturation signal to hematocrit and oxygen saturation measurements for output on said display panel.
Claim 3
Dependent Claim
46 words
The apparatus as defined in claim 1 wherein said means for producing adjusted hematocrit and oxygen saturation signals comprises a memory module, said memory module being used to store data tables which are accessed to produce said adjusted hematocrit signal and said adjusted oxygen saturation signal.
Claim 4
Dependent Claim
39 words
The apparatus as defined in claim 1 wherein said carriage is configured in a manner so as to allow said hematocrit and said oxygen saturation levels to be measured while said quantity of blood is in a flowing mode.
Claim 5
Dependent Claim
39 words
The apparatus as defined in claim 1 wherein said carriage is configured in a manner so as to allow said hematocrit and said oxygen saturation levels to be measured while said quantity of blood is in a static mode.
Claim 6
Dependent Claim
36 words
The apparatus as defined in claim 4 wherein said apparatus includes a blood mixing mechanism to prevent red blood cells from settling in said receptacle when said hematocrit and said oxygen saturation measurements are being taken.
Claim 7
Dependent Claim
52 words
The apparatus as defined in claim 5 wherein said blood mixing mechanism comprises a shaft having a first end and a second end, said first end being attached to said carriage and said second end being attached to a motor disposed within said housing, said motor being operative to resonate said carriage.
Claim 8
Dependent Claim
34 words
The apparatus as defined in claim 5 wherein said blood mixing mechanism comprises an ultrasound emitter mounted to said carriage in a manner wherein sound waves from said emitter are directed toward said receptacle.
Claim 9
Dependent Claim
39 words
The apparatus as defined in claim 4 wherein said carriage includes a magnetizing means for subjecting said quantity of blood contained within said receptacle to magnetic effects to pull proteins away from red blood cells contained in said blood.
Claim 10
Dependent Claim
38 words
The apparatus as defined in claim 1 wherein said carriage is releasably connected to said housing so as to be interchangeable with other carriages which are of similar design but sized and configured to accommodate different receptacle sizes.
Claim 11
Dependent Claim
36 words
The apparatus as defined in claim 1 wherein said light source comprises first and second light emitting diodes, wherein light from said first diode and said second diode is merged into a single light emission path.
Claim 12
Dependent Claim
52 words
The apparatus as defined in claim 10 wherein said light emission path comprises a first opticalfiber having a proximal end and a distal end, said distal end including an optical splitter disposed thereon which is operable to channel light from said first diode and said second diode into said first optical fiber.
Claim 13
Dependent Claim
47 words
The apparatus as defined in claim 11 wherein said first diode is fabricated in a manner so as to produce and emit light from said first wavelength and said second diode is fabricated in a manner so as to produce and emit light from said second wavelength.
Claim 14
Dependent Claim
20 words
The apparatus as defined in claim 12 wherein said first diode is active at different times than said second diode.
Claim 15
Dependent Claim
148 words
The apparatus as defined in claim 11 wherein said carriage comprises: an elongate, horizontally oriented lower member having top and bottom surfaces, said top surface including a longitudinally extending recessed portion disposed therein which is sized and configured to receive said receptacle, said recessed portion further defining a first longitudinal axis on an interior surface thereof; and an elongate, horizontally oriented upper member, said upper member being movable between an open position and a closed position and having top and bottom surfaces, said bottom surface defining a second longitudinally extending axis thereon; said upper member being cooperatively engaged to said lower member such that when said upper member is in said closed position, said bottom surface of said upper member opposes said top surface of said lower member in a manner wherein said second longitudinal axis is in vertical alignment with and parallel to said first longitudinal axis.
Claim 16
Dependent Claim
43 words
The apparatus as defined in claim 14 wherein said first optical fiber is disposed within said carriage in a manner wherein said proximal end of said first optical fiber is positioned within said recessed portion at a point on said first longitudinal axis.
Claim 17
Dependent Claim
88 words
The apparatus as defined in claim 15 wherein said second sensing means for producing an oxygen saturation signal comprises: second and third optical fibers having proximal ends positioned on said first longitudinal axis on opposite sides of and equal distances from said proximal end of said first optical fiber; wherein a signal generated by the receipt of scattered light into said third optical fiber is used to compensate a signal generated by the receipt of scattered light into said second optical fiber in producing said oxygen saturation signal.
Claim 18
Dependent Claim
121 words
The apparatus as defined in claim 16 wherein said first sensing means for producing a hematocrit signal comprises: fourth and fifth optical fibers having proximal ends positioned on said first longitudinal axis on opposite sides of and equal distances from said first optical fiber, and equal distances from said second and third optical fibers, such that said second optical fiber is disposed between said first and fourth optical fibers, and said third optical fiber is disposed between said first and fifth optical fibers; wherein a signal generated by the receipt of scattered light into said fifth optical fiber is used to compensate a signal generated by the receipt of scattered light into said fourth optical fiber in producing said hematocrit signal.
Claim 19
Dependent Claim
129 words
The apparatus as defined in claim 17 wherein said third sensing means for producing a calibration signal comprises: sixth and seventh optical fibers having proximal ends positioned on said second longitudinal axis in an orientation such that when said upper member is in said closed position, said sixth optical fiber is positioned at a point one-half the distance between said first optical fiber and said fourth optical fiber, and said seventh optical fiber is positioned at a point one-half the distance between said first optical fiber and said fifth optical fiber; wherein a signal generated by the receipt of scattered light into said seventh optical fiber is used to compensate a signal generated by the receipt of scattered light into said sixth optical fiber in producing said calibration signal.
Claim 20
Dependent Claim
49 words
The apparatus as defined in claim 4 wherein said receptacle comprises: a syringe comprising an elongate, tubular member having a generally planar window disposed within a portion thereof, said window being constructed of a material which provides a repeatable optical path for said first and second wavelengths of light.
Claim 21
Dependent Claim
12 words
The apparatus as defined in claim 19 wherein said window is concave.
Claim 22
Dependent Claim
12 words
The apparatus as defined in claim 19 wherein said window is convex.
Claim 23
Dependent Claim
48 words
The apparatus as defined in claim 19 wherein said syringe includes means to orient said syringe within said carriage such that light from said light source enters said syringe through said window and is reflected back through said window into said first sensing means and said sensing means.
Claim 24
Dependent Claim
36 words
The apparatus as defined in claim 4 wherein said receptacle comprises: a syringe comprising an elongate tubular member constructed of a material which provides a repeatable optical path for said first and second wavelengths of light.
Claim 25
Independent Claim
122 words
An apparatus for measuring hematocrit and oxygen saturation levels of a volume of blood comprising: a housing; a receptacle sized to store a quantity of blood therein; means formed on said housing for supporting said receptacle; a first sensing means carried by said housing for generating an electrical signal in response to detection of hematocrit in said quantity of blood; a second sensing means carried by said housing for generating an electrical signal in response to detection of oxygen saturation in said quantity of blood; means for oscillating said supporting means to maintain red blood cells in suspension in said quantity of blood within said receptacle; and means for magnetizing said supporting means to pull proteins away from said red blood cells.
Claim 26
Independent Claim
122 words
An apparatus for measuring hematocrit and oxygen saturation levels of a volume of blood comprising: a housing; a receptacle sized to store a quantity of blood therein; means formed on said housing for supporting said receptacle; a first sensing means carried by said housing for generating an electrical signal in response to detection of hematocrit in said quantity of blood; a second sensing means carried by said housing for generating an electrical signal in response to detection of oxygen saturation in said quantity of blood; means for oscillating said supporting means to maintain red blood cells in suspension in said quantity of blood within said receptacle; and means for magnetizing said supporting means to pull proteins away from said red blood cells.
Claim 27
Independent Claim
158 words
An apparatus for measuring hematocrit and oxygen saturation levels of a volume of blood comprising: a first means for producing a hematocrit signal as a function of the scattering of light from an infrared wavelength by said blood; a second means for producing an oxygen saturation signal as a function of the scattering of light from a red wavelength and said infrared wavelength by said blood; a third means for filtering said hematocrit signal and said oxygen saturation signal for system noise and outside interference; means for producing an adjusted hematocrit signal and an adjusted oxygen saturation signal, said adjusted hematocrit signal comprising said hematocrit signal as compensated for effects of oxygen saturation, temperature, and blood pH and said adjusted oxygen saturation signal comprising said oxygen saturation signal as compensated for effects of hematocrit, temperature, and blood pH; and means for producing hematocrit and oxygen saturation measurements as a function of said adjusted hematocrit and oxygen saturation signals.
Claim 28
Independent Claim
158 words
An apparatus for measuring hematocrit and oxygen saturation levels of a volume of blood comprising: a first means for producing a hematocrit signal as a function of the scattering of light from an infrared wavelength by said blood; a second means for producing an oxygen saturation signal as a function of the scattering of light from a red wavelength and said infrared wavelength by said blood; a third means for filtering said hematocrit signal and said oxygen saturation signal for system noise and outside interference; means for producing an adjusted hematocrit signal and an adjusted oxygen saturation signal, said adjusted hematocrit signal comprising said hematocrit signal as compensated for effects of oxygen saturation, temperature, and blood pH and said adjusted oxygen saturation signal comprising said oxygen saturation signal as compensated for effects of hematocrit, temperature, and blood pH; and means for producing hematocrit and oxygen saturation measurements as a function of said adjusted hematocrit and oxygen saturation signals.
Claim 29
Dependent Claim
17 words
The apparatus as defined in claim 25 wherein said apparatus further comprises means for calibrating said apparatus.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-18 | 1995-05-20 | 1995-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-18 | 1999-05-20 | 1999-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-18 | 2003-05-20 | 2003-11-19 | $7700.00 | Window Closed / Lapsed |