Robert R Steuer
Physician in Ogden, UT

6681128, Jan 20, 2004

Jun 13, 2001

09/879192

Robert R. Steuer - Pleasant View UT
David H. Harris - Ogden UT

Hema Metrics, Inc. - Kaysville UT

A61B 500

600322, 600310, 600330

A system determines heamtocrit transcutaneously and noninvasively. Disclosed are a finger clip assembly and an earlobe clip assembly, each including at least a pair of emitters and a photodiode in appropriate alignment to enable operation in either a transmissive mode or a reflectance mode. At least two, and preferably three, predetermined wavelengths of light are assed onto or through body tissues such as the finger, earlobe, or scalp, etc. and the extinction of each wavelength is detected. Mathematical manipulation of the detected values compensates for the effects of body tissue and fluid and determines the hematocrit value. If a fourth wavelength of light is used which is extinguished substantially differently by oxyhemoglobin and reduced hemoglobin and which is not substantially extinguished by plasmas, then the blood oxygen saturation value, independent of hematocrit, maybe determined. It is also disclosed how to detect and analyze multiple wavelengths using a logarithmic DC analysis technique. Then a pulse wave is not required.

6746407, Jun 8, 2004

Dec 29, 2000

09/750122

Robert R. Steuer - Pleasant View UT
David A. Bell - Farmington UT
David R. Miller - Morgan UT

Hema Metrics, Inc. - Kaysville UT

A61B 500

600505, 604 4

Indicator dilution techniques are used to measure vascular access flow rates during routine hemodialysis. A bolus injection port is used to infuse a specific volume (V ) of an indicator diluent, such as saline or dye, into the patient cardiovascular circuit by one of the following: 1. Needle injection of a known volume (bolus) of indicator diluent directly into the access site in the presence or absence of the hemodialysis circuit. 2. Infusion of an indicator diluent into the arterial, venous line upstream of the venous needle. 3. Turning the ultrafiltration of the dialysis delivery system from OFF to ON and OFF again over a predetermined time period. 4. In a hemodialysis circuit, turning on the hemodialysis pump and using the priming saline volume as a single saline bolus. A transdermal sensor is used to measure the percent change in a blood parameter. The sensor is positioned directly over the vascular access site a prescribed distance downstream of the injection site and upstream of the access-vein connection.

6725072, Apr 20, 2004

Dec 29, 2000

09/750076

Robert R. Steuer - Pleasant View UT
David A. Bell - Farmington UT
David R. Miller - Morgan UT

Hema Metrics, Inc. - Kaysville UT

A61B 500

600310, 600322

An optical sensor includes photoemitter and photodetector elements at multiple spacings (d , d ) for the purpose of measuring the bulk absorptivity () of an area immediately surrounding and including a hemodialysis access site, and the absorptivity ( ) of the tissue itself. At least one photoemitter element and at least one photodetector element are provided, the total number of photoemitter and photodetector elements being at least three. The photoemitter and photodetector elements are collinear and alternatingly arranged, thereby allowing the direct transcutaneous determination of vascular access blood flow.

6687519, Feb 3, 2004

Jan 22, 2001

09/765584

Robert R. Steuer - Pleasant View UT
David R. Miller - Morgan UT

Hema Metrics, Inc. - Kaysville UT

A61B 500

600322, 600473

Systems and methods are provided for noninvasively measuring the levels of urea, blood osmolarity (or Na ), plasma free hemoglobin and tissue water content in a patients blood or tissue. Light of selected wavelengths is passed through blood or body tissue and the transmitted or reflected light is detected and the detected signals can be electronically compared and manipulated to provide the non-invasive, continuous and quantitative display of a patients blood urea, blood osmolarity (or Na ), plasma free hemoglobin and tissue water content.

5456253, Oct 10, 1995

Sep 27, 1994

8/312712

Robert R. Steuer - Pleasant View UT
David H. Harris - Ogden UT

In-Line Diagnostics Corporation - Riverdale UT

A61B 500

128633

A disposable cuvette through which to pass pulsatile flowing blood. The cuvette has a conduit with two opposed walls having a predetermined separation therebetween that varies with each pulse of the flowing blood. A sealed air pocket damps the variation of the predetermined separation. The conduit is comprised of materials which permit passage therethrough of wavelengths of selected electromagnetic radiation. The radiation is emitted from a photoemitter which, and after passing through the cuvette, is detected by a photodetector. The quantities of detected radiation are operated on by a computer which uses a spectrophotometry technique to derive therefrom a blood constituent concentration value. Preferably, both cuvette and spectrophotometry technique are used during hemodialysis to derive changes in the hematocrit value of the blood of a dialyzed patient, thereby to deduce therefrom changes in the blood volume of the patient during dialysis. The technique enables a clinician to monitor a desired biologic constituent concentration value, such as the hematocrit, oxygen saturation, or oxygen content values by deriving and displaying the same as digital values in real time.

6181958, Jan 30, 2001

Feb 5, 1999

9/244756

Robert R. Steuer - Pleasant View UT
David R. Miller - Morgan UT

In-Line Diagnostics Corporation - Riverdale UT

A61B 500

600322

A system for determining a biologic constituent including hematocrit transcutaneously, noninvasively and continuously. A finger clip assembly includes including at least a pair of emitters and a photodiode in appropriate alignment to enable operation in either a transmissive mode or a reflectance mode. At least one predetermined wavelength of light is passed onto or through body tissues such as a finger, earlobe, or scalp, etc. and attenuation of light at that wavelength is detected. Likewise, the change in blood flow is determined by various techniques including optical, pressure, piezo and strain gage methods. Mathematical manipulation of the detected values compensates for the effects of body tissue and fluid and determines the hematocrit value. If an additional wavelength of light is used which attenuates light substantially differently by oxyhemoglobin and reduced hemoglobin, then the blood oxygen saturation value, independent of hematocrit may be determined. Further, if an additional wavelength of light is used which greatly attenuates light due to bilirubin (440 nm) or glucose (1060 nm), then the bilirubin or glucose value may also be determined.

5803908, Sep 8, 1998

Jun 7, 1995

8/479352

Robert R. Steuer - Pleasant View UT
David H. Harris - Ogden UT

In-Line Diagnostics Corporation - Riverdale UT

A61B 500

600314

A system for determining the hematocrit transcutaneously and noninvasively. Disclosed are a finger clip assembly and an earlobe clip assembly, each including at least a pair of emitters and a photodiode in appropriate alignment to enable operation in either a transmissive mode or a reflectance mode. At least two, and preferably three, predetermined wavelengths of light are passed onto or through body tissues such as the finger, earlobe, or scalp, etc. and the extinction of each wavelength is detected. Mathematical manipulation of the detected values compensates for the effects of body tissue and fluid and determines the hematocrit value. If a fourth wavelength of light is used which is extinguished substantially differently by oxyhemoglobin and reduced hemoglobin and which is not substantially extinguished by plasma, then the blood oxygen saturation value, independent of hematocrit, may be determined. It is also disclosed how to detect and analyze multiple wavelengths using a logarithmic DC analysis technique. Then a pulse wave is not required.

5372136, Dec 13, 1994

Feb 1, 1993

8/011882

Robert R. Steuer - Pleasant View UT
David H. Harris - Ogden UT

Noninvasive Medical Technology Corporation - Ogden UT

A61B 500

128633

A system for determining the hematocrit transcutaneously and noninvasively. Disclosed are a finger clip assembly and an earlobe clip assembly, each including at least a pair of emitters and a photodiode in appropriate alignment to enable operation in either a transmissive mode or a reflectance mode. At least two, and preferably three, predetermined wavelengths of light are passed onto or through body tissues such as the finger, earlobe, or scalp, etc. and the extinction of each wavelength is detected. Mathematical manipulation of the detected values compensates for the effects of body tissue and fluid and determines the hematocrit value. If a fourth wavelength of light is used which is extinguished substantially differently by oxyhemoglobin and reduced hemoglobin and which is not substantially extinguished by plasma, then the blood oxygen saturation value, independent of hematocrit, may be determined. It is also disclosed how to detect and analyze multiple wavelengths using a logarithmic DC analysis technique. Then a pulse wave is not required so, this method may be utilized in states of low blood pressure or low blood flow.

2012025, Oct 4, 2012

Mar 26, 2012

13/429663

Robert STEUER - Ogden UT, US

A61B 5/1455

600322, 600310

A non-invasive method and apparatus utilizing a single wavelength (800 nm, isobestic) for the instantaneous, reflective, non-pulsatile spatially resolved reflectance system, apparatus and mathematics that allows for the correct determination of critical photo-optical parameters in vivo. Transcutaneous blood constituent (analyte or drug level) measurements can be determined in real-time. The “closed-form” nature of the mathematics allows for immediate calculations and real-time display of Hematocrit and other pertinent blood values in a variety of handheld or other like devices.