Patents by Inventor Robert R. Steuer

Robert R. Steuer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6987993
    Abstract: An optical sensor includes photoemitter and photodetector elements at multiple spacings (d1, d2) for the purpose of measuring the bulk absorptivity (?) of an area immediately surrounding and including a hemodialysis access site, and the absorptivity (?o) 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.
    Type: Grant
    Filed: December 9, 2003
    Date of Patent: January 17, 2006
    Assignee: Hema Metrics, Inc.
    Inventors: Robert R. Steuer, David A. Bell, David R. Miller
  • Patent number: 6937882
    Abstract: An optical sensor includes photoemitter and photodetector elements at multiple spacings (d1, d2) for the purpose of measuring the bulk absorptivity (?) of an area immediately surrounding and including a hemodialysis access site, and the absorptivity (?o) 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.
    Type: Grant
    Filed: December 9, 2003
    Date of Patent: August 30, 2005
    Assignee: Hema Metrics, Inc.
    Inventors: Robert R. Steuer, David A. Bell, David R. Miller
  • Patent number: 6873865
    Abstract: 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.
    Type: Grant
    Filed: December 12, 2003
    Date of Patent: March 29, 2005
    Assignee: Hema Metrics, Inc.
    Inventors: Robert R. Steuer, David R. Miller
  • Publication number: 20040220484
    Abstract: Indicator dilution techniques are used to measure vascular access flow rates during routine hemodialysis.
    Type: Application
    Filed: May 28, 2004
    Publication date: November 4, 2004
    Inventors: Robert R. Steuer, David A. Bell, David R. Miller
  • Publication number: 20040127779
    Abstract: 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.
    Type: Application
    Filed: December 12, 2003
    Publication date: July 1, 2004
    Inventors: Robert R. Steuer, David R. Miller
  • Publication number: 20040122330
    Abstract: An optical sensor includes photoemitter and photodetector elements at multiple spacings (d1, d2) for the purpose of measuring the bulk absorptivity (&agr;) of an area immediately surrounding and including a hemodialysis access site, and the absorptivity (&agr;o) 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.
    Type: Application
    Filed: December 9, 2003
    Publication date: June 24, 2004
    Inventors: Robert R. Steuer, David A. Bell, David R. Miller
  • Publication number: 20040116817
    Abstract: An optical sensor includes photoemitter and photodetector elements at multiple spacings (d1, d2) for the purpose of measuring the bulk absorptivity (&agr;) of an area immediately surrounding and including a hemodialysis access site, and the absorptivity (&agr;o) 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.
    Type: Application
    Filed: December 9, 2003
    Publication date: June 17, 2004
    Inventors: Robert R. Steuer, David A. Bell, David R. Miller
  • Publication number: 20040116790
    Abstract: An optical sensor includes photoemitter and photodetector elements at multiple spacings (d1, d2) for the purpose of measuring the bulk absorptivity (&agr;) of an area immediately surrounding and including a hemodialysis access site, and the absorptivity (&agr;o) 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.
    Type: Application
    Filed: December 9, 2003
    Publication date: June 17, 2004
    Inventors: Robert R. Steuer, David A. Bell, David R. Miller
  • Patent number: 6746407
    Abstract: 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 (Vi) 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.
    Type: Grant
    Filed: December 29, 2000
    Date of Patent: June 8, 2004
    Assignee: Hema Metrics, Inc.
    Inventors: Robert R. Steuer, David A. Bell, David R. Miller
  • Patent number: 6746415
    Abstract: A cuvette having a pedestal for transmitting light through a relatively thin layer of blood. While the pedestal enables the use of a small path length it also permits the use of a high volume and/or high flow rate conduit. The pedestal further enables methods of determining various blood parameters in which the path length, d, is fixed; i.e., there are little or no pulsatile variations. Hence, the flow-through cuvette accommodates a large range of blood flow rates without any reduction in accuracy of the hematocrit measurement. The pedestal, because of its elliptical shape, does not damage or hemolyze the individual red blood cells as they pass through. A quantitative method for determining changes in blood volume in view of the path length is provided along with a method for measuring a patient's cardiac output and oxygen consumption rate. Cardiac output is obtained by injecting a saline arterial bolus and a saline venous bolus into a patient and measuring the change in hematocrit caused by each bolus.
    Type: Grant
    Filed: May 25, 2000
    Date of Patent: June 8, 2004
    Assignee: Hema Metrics, Inc.
    Inventors: Robert R. Steuer, David R. Miller
  • Patent number: 6725072
    Abstract: An optical sensor includes photoemitter and photodetector elements at multiple spacings (d1, d2) for the purpose of measuring the bulk absorptivity (&agr;) of an area immediately surrounding and including a hemodialysis access site, and the absorptivity (&agr;o) 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.
    Type: Grant
    Filed: December 29, 2000
    Date of Patent: April 20, 2004
    Assignee: Hema Metrics, Inc.
    Inventors: Robert R. Steuer, David A. Bell, David R. Miller
  • Patent number: 6687519
    Abstract: 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 patient's 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 patient's blood urea, blood osmolarity (or Na+), plasma free hemoglobin and tissue water content.
    Type: Grant
    Filed: January 22, 2001
    Date of Patent: February 3, 2004
    Assignee: Hema Metrics, Inc.
    Inventors: Robert R. Steuer, David R. Miller
  • Patent number: 6681128
    Abstract: 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.
    Type: Grant
    Filed: June 13, 2001
    Date of Patent: January 20, 2004
    Assignee: Hema Metrics, Inc.
    Inventors: Robert R. Steuer, David H. Harris
  • Patent number: 6671528
    Abstract: 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.
    Type: Grant
    Filed: January 30, 2001
    Date of Patent: December 30, 2003
    Assignee: Hema Metrics, Inc.
    Inventors: Robert R. Steuer, David R. Miller
  • Patent number: 6582656
    Abstract: Access recirculation in a shunt is determined quantitatively by a method in which a standard solution, such as a saline, is injected into a patient's bloodstream upstream of the shunt. At a point in the access line, a photometric measurement is conducted of the change in hematocrit (&Dgr;H) with respect to time. Electronic circuitry receives signals from the detector and compares the integrated area of &Dgr;H with respect to time of the standard solution initially flowing through the access and of the recirculated solution and provides display of access recirculation. In another aspect, access recirculation and access blood flow are quantitatively determined without injecting a solution into the bloodstream. In this aspect the extent of access recirculation and/or access blood flow is determined quantitatively by a method in which the dialyzer blood flow rate or the ultrafiltration rate (UFR) is changed and the corresponding change in concentration of a blood constituent is measured.
    Type: Grant
    Filed: March 28, 2000
    Date of Patent: June 24, 2003
    Assignee: In-Line Diagnostics Corporation
    Inventors: Robert R. Steuer, David R. Miller
  • Publication number: 20020128545
    Abstract: Indicator dilution techniques are used to measure vascular access flow rates during routine hemodialysis.
    Type: Application
    Filed: December 29, 2000
    Publication date: September 12, 2002
    Inventors: Robert R. Steuer, David A. Bell, David R. Miller
  • Publication number: 20020038079
    Abstract: 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.
    Type: Application
    Filed: June 13, 2001
    Publication date: March 28, 2002
    Inventors: Robert R. Steuer, David H. Harris
  • Publication number: 20010039376
    Abstract: 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.
    Type: Application
    Filed: January 30, 2001
    Publication date: November 8, 2001
    Inventors: Robert R. Steuer, David R. Miller
  • Publication number: 20010020122
    Abstract: 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 patient's 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 patient's blood urea, blood osmolarity (or Na+), plasma free hemoglobin and tissue water content.
    Type: Application
    Filed: January 22, 2001
    Publication date: September 6, 2001
    Inventors: Robert R. Steuer, David R. Miller
  • Patent number: 6266546
    Abstract: 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.
    Type: Grant
    Filed: May 28, 1998
    Date of Patent: July 24, 2001
    Assignee: In-Line Diagnostics Corporation
    Inventors: Robert R. Steuer, David H. Harris