Patents by Inventor Perry N. Law
Perry N. Law 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).
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Publication number: 20220323658Abstract: Embodiments of the disclosure provide a method for determining beginning blood volume of a patient during dialysis (e.g., hemodialysis). Ultrafiltration rates are determined at different time stamps during dialysis by obtaining a blood flowrate measurement and hematocrit measurements at input port and output port of a dialyzer connected to the patient. The flowrate and hematocrit measurements are used to determine fluid removed from the patient during dialysis. The ultrafiltration rates and fluid removed from the patient are used to determine the beginning blood volume of the patient.Type: ApplicationFiled: June 17, 2022Publication date: October 13, 2022Inventors: Louis LeeGrande Barrett, Perry N. Law, Douglas L. Cox
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Patent number: 11389576Abstract: Embodiments of the disclosure provide a method for determining beginning blood volume of a patient during dialysis (e.g., hemodialysis). Ultrafiltration rates are determined at different time stamps during dialysis by obtaining a blood flowrate measurement and hematocrit measurements at input port and output port of a dialyzer connected to the patient. The flowrate and hematocrit measurements are used to determine fluid removed from the patient during dialysis. The ultrafiltration rates and fluid removed from the patient are used to determine the beginning blood volume of the patient.Type: GrantFiled: December 3, 2018Date of Patent: July 19, 2022Assignee: Fresenius Medical Care Holdings, Inc.Inventors: Louis Leegrande Barrett, Perry N. Law, Douglas L. Cox
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Patent number: 11013846Abstract: Systems and sensor clip assemblies for optically monitoring blood flowing through a blood chamber are provided. A sensor clip assembly includes emitters and photodetectors positioned on opposing arms, a signal conditioning circuit for conditioning raw analog signals generated by the photodetectors while the sensor clip assembly is fastened to a blood chamber, and an analog-to-digital converter for converting the conditioned analog signals to raw digital data. The sensor clip assembly may include a microcontroller for calculating parameters of blood flowing through the blood chamber such as hematocrit, oxygen saturation, and change in blood volume from the raw digital data. The sensor clip assembly is in communication with a networked computer, and the networked computer is in communication with a remote computer configured to provide a user interface for monitoring and/or controlling the sensor clip assembly.Type: GrantFiled: April 24, 2020Date of Patent: May 25, 2021Assignee: Fresenius Medical Care Holdings, Inc.Inventors: Louis LeeGrande Barrett, David W. Peterson, Matthew A. Stowell, Perry N. Law
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Publication number: 20200353150Abstract: Systems and sensor clip assemblies for optically monitoring blood flowing through a blood chamber are provided. A sensor clip assembly includes emitters and photodetectors positioned on opposing arms, a signal conditioning circuit for conditioning raw analog signals generated by the photodetectors while the sensor clip assembly is fastened to a blood chamber, and an analog-to-digital converter for converting the conditioned analog signals to raw digital data. The sensor clip assembly may include a microcontroller for calculating parameters of blood flowing through the blood chamber such as hematocrit, oxygen saturation, and change in blood volume from the raw digital data. The sensor clip assembly is in communication with a networked computer, and the networked computer is in communication with a remote computer configured to provide a user interface for monitoring and/or controlling the sensor clip assembly.Type: ApplicationFiled: April 24, 2020Publication date: November 12, 2020Inventors: Louis LeeGrande Barrett, David W. Peterson, Matthew A. Stowell, Perry N. Law
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Publication number: 20200171229Abstract: Embodiments of the disclosure provide a method for determining beginning blood volume of a patient during dialysis (e.g., hemodialysis). Ultrafiltration rates are determined at different time stamps during dialysis by obtaining a blood flowrate measurement and hematocrit measurements at input port and output port of a dialyzer connected to the patient. The flowrate and hematocrit measurements are used to determine fluid removed from the patient during dialysis. The ultrafiltration rates and fluid removed from the patient are used to determine the beginning blood volume of the patient.Type: ApplicationFiled: December 3, 2018Publication date: June 4, 2020Inventors: Louis LeeGrande Barrett, Perry N. Law, Douglas L. Cox
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Patent number: 10668204Abstract: Systems and sensor clip assemblies for optically monitoring blood flowing through a blood chamber are provided. A sensor clip assembly includes emitters and photodetectors positioned on opposing arms, a signal conditioning circuit for conditioning raw analog signals generated by the photodetectors while the sensor clip assembly is fastened to a blood chamber, and an analog-to-digital converter for converting the conditioned analog signals to raw digital data. The sensor clip assembly may include a microcontroller for calculating parameters of blood flowing through the blood chamber such as hematocrit, oxygen saturation, and change in blood volume from the raw digital data. The sensor clip assembly is in communication with a networked computer, and the networked computer is in communication with a remote computer configured to provide a user interface for monitoring and/or controlling the sensor clip assembly.Type: GrantFiled: August 19, 2019Date of Patent: June 2, 2020Assignee: Fresenius Medical Care Holdings, Inc.Inventors: Louis LeeGrande Barrett, David W. Peterson, Matthew A. Stowell, Perry N. Law
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Publication number: 20190365980Abstract: Systems and sensor clip assemblies for optically monitoring blood flowing through a blood chamber are provided. A sensor clip assembly includes emitters and photodetectors positioned on opposing arms, a signal conditioning circuit for conditioning raw analog signals generated by the photodetectors while the sensor clip assembly is fastened to a blood chamber, and an analog-to-digital converter for converting the conditioned analog signals to raw digital data. The sensor clip assembly may include a microcontroller for calculating parameters of blood flowing through the blood chamber such as hematocrit, oxygen saturation, and change in blood volume from the raw digital data. The sensor clip assembly is in communication with a networked computer, and the networked computer is in communication with a remote computer configured to provide a user interface for monitoring and/or controlling the sensor clip assembly.Type: ApplicationFiled: August 19, 2019Publication date: December 5, 2019Inventors: Louis LeeGrande Barrett, David W. Peterson, Matthew A. Stowell, Perry N. Law
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Patent number: 10471201Abstract: Systems and sensor clip assemblies for optically monitoring blood flowing through a blood chamber are provided. A sensor clip assembly includes emitters and photodetectors positioned on opposing arms, a signal conditioning circuit for conditioning raw analog signals generated by the photodetectors while the sensor clip assembly is fastened to a blood chamber, and an analog-to-digital converter for converting the conditioned analog signals to raw digital data. The sensor clip assembly may output the raw digital data to an external device and receive synchronized control signals from the external device, or the sensor clip assembly may include a microcontroller for performing calculations on the raw digital data and providing synchronized control signals internally. Parameters of blood flowing through the blood chamber such as hematocrit, oxygen saturation, and change in blood volume may be calculated from the raw digital data derived from the raw analog signals generated by the photodetectors.Type: GrantFiled: December 14, 2018Date of Patent: November 12, 2019Assignee: Fresenius Medical Care Holdings, Inc.Inventors: Louis LeeGrande Barrett, David W. Peterson, Matthew A. Stowell, Perry N. Law
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Publication number: 20190117871Abstract: Systems and sensor clip assemblies for optically monitoring blood flowing through a blood chamber are provided. A sensor clip assembly includes emitters and photodetectors positioned on opposing arms, a signal conditioning circuit for conditioning raw analog signals generated by the photodetectors while the sensor clip assembly is fastened to a blood chamber, and an analog-to-digital converter for converting the conditioned analog signals to raw digital data. The sensor clip assembly may output the raw digital data to an external device and receive synchronized control signals from the external device, or the sensor clip assembly may include a microcontroller for performing calculations on the raw digital data and providing synchronized control signals internally. Parameters of blood flowing through the blood chamber such as hematocrit, oxygen saturation, and change in blood volume may be calculated from the raw digital data derived from the raw analog signals generated by the photodetectors.Type: ApplicationFiled: December 14, 2018Publication date: April 25, 2019Inventors: Louis LeeGrande Barrett, David W. Peterson, Matthew A. Stowell, Perry N. Law
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Patent number: 10179201Abstract: Systems and sensor clip assemblies for optically monitoring blood flowing through a blood chamber are provided. A sensor clip assembly includes emitters and photodetectors positioned on opposing arms, a signal conditioning circuit for conditioning raw analog signals generated by the photodetectors while the sensor clip assembly is fastened to a blood chamber, and an analog-to-digital converter for converting the conditioned analog signals to raw digital data. The sensor clip assembly may output the raw digital data to an external device and receive synchronized control signals from the external device, or the sensor clip assembly may include a microcontroller for performing calculations on the raw digital data and providing synchronized control signals internally. Parameters of blood flowing through the blood chamber such as hematocrit, oxygen saturation, and change in blood volume may be calculated from the raw digital data derived from the raw analog signals generated by the photodetectors.Type: GrantFiled: August 25, 2017Date of Patent: January 15, 2019Assignee: Fresenius Medical Care Holdings, Inc.Inventors: Louis L. Barrett, David W. Peterson, Matthew A. Stowell, Perry N. Law
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Patent number: 9849225Abstract: An optical blood monitoring system and corresponding method avoid the need to obtain a precise intensity value of the light impinging upon the measured blood layer during the analysis. The system is operated to determine at least two optical measurements through blood layers of different thickness but otherwise substantially identical systems. Due to the equivalence of the systems, the two measurements can be compared so that the bulk extinction coefficient of the blood can be calculated based only on the known blood layer thicknesses and the two measurements. Reliable measurements of various blood parameters can thereby be determined without certain calibration steps.Type: GrantFiled: February 4, 2016Date of Patent: December 26, 2017Assignee: Fresenius Medical Care Holdings, Inc.Inventors: Louis L. Barrett, Perry N. Law
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Publication number: 20170348473Abstract: Systems and sensor clip assemblies for optically monitoring blood flowing through a blood chamber are provided. A sensor clip assembly includes emitters and photodetectors positioned on opposing arms, a signal conditioning circuit for conditioning raw analog signals generated by the photodetectors while the sensor clip assembly is fastened to a blood chamber, and an analog-to-digital converter for converting the conditioned analog signals to raw digital data. The sensor clip assembly may output the raw digital data to an external device and receive synchronized control signals from the external device, or the sensor clip assembly may include a microcontroller for performing calculations on the raw digital data and providing synchronized control signals internally. Parameters of blood flowing through the blood chamber such as hematocrit, oxygen saturation, and change in blood volume may be calculated from the raw digital data derived from the raw analog signals generated by the photodetectors.Type: ApplicationFiled: August 25, 2017Publication date: December 7, 2017Inventors: Louis L. Barrett, David W. Peterson, Matthew A. Stowell, Perry N. Law
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Patent number: 9801993Abstract: Systems and sensor clip assemblies for optically monitoring blood flowing through a blood chamber are provided. A sensor clip assembly includes emitters and photodetectors positioned on opposing arms, a signal conditioning circuit for conditioning raw analog signals generated by the photodetectors while the sensor clip assembly is fastened to a blood chamber, and an analog-to-digital converter for converting the conditioned analog signals to raw digital data. The sensor clip assembly may output the raw digital data to an external device and receive synchronized control signals from the external device, or the sensor clip assembly may include a microcontroller for performing calculations on the raw digital data and providing synchronized control signals internally. Parameters of blood flowing through the blood chamber such as hematocrit, oxygen saturation, and change in blood volume may be calculated from the raw digital data derived from the raw analog signals generated by the photodetectors.Type: GrantFiled: November 17, 2011Date of Patent: October 31, 2017Assignee: Fresenius Medical Care Holdings, Inc.Inventors: Louis L. Barrett, David W. Peterson, Matthew A. Stowell, Perry N. Law
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Publication number: 20160158427Abstract: An optical blood monitoring system and corresponding method avoid the need to obtain a precise intensity value of the light impinging upon the measured blood layer during the analysis. The system is operated to determine at least two optical measurements through blood layers of different thickness but otherwise substantially identical systems. Due to the equivalence of the systems, the two measurements can be compared so that the bulk extinction coefficient of the blood can be calculated based only on the known blood layer thicknesses and the two measurements. Reliable measurements of various blood parameters can thereby be determined without certain calibration steps.Type: ApplicationFiled: February 4, 2016Publication date: June 9, 2016Inventors: Louis L. Barrett, Perry N. Law
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Patent number: 9308306Abstract: An optical blood monitoring system and corresponding method avoid the need to obtain a precise intensity value of the light impinging upon the measured blood layer during the analysis. The system is operated to determine at least two optical measurements through blood layers of different thickness but otherwise substantially identical systems. Due to the equivalence of the systems, the two measurements can be compared so that the bulk extinction coefficient of the blood can be calculated based only on the known blood layer thicknesses and the two measurements. Reliable measurements of various blood parameters can thereby be determined without certain calibration steps.Type: GrantFiled: February 24, 2014Date of Patent: April 12, 2016Assignee: Fresenius Medical Care Holdings, Inc.Inventors: Louis Lee Barrett, Perry N. Law
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Patent number: 9285305Abstract: An optical blood monitoring system for blocking unwanted light from reaching sensors in a sensor clip assembly fastened to a blood chamber connected in an extracorporeal blood treatment system. The blood chamber has an internal flow cavity for communicating the extracorporeal blood flow and viewing windows to enable the sensor clip assembly to illuminate the blood with light as the blood flows through the blood chamber in order to monitor characteristics of the blood. The sensor clip assembly includes opposing heads with LED emitters and photodetectors. In one embodiment, lenses in the heads are surrounded by shrouds extending from the lenses so that when the sensor clip assembly is fastened to the blood chamber the shrouds block unwanted light from reaching the photodetectors.Type: GrantFiled: April 28, 2014Date of Patent: March 15, 2016Assignee: Fresenius Medical Care Holdings, Inc.Inventors: Louis L. Barrett, Perry N. Law
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Patent number: 9194792Abstract: An extracorporeal blood chamber for an optical blood monitoring system includes an opaque chamber body in order to prevent inaccuracies when measuring oxygen saturation levels due to light ducting, which can occur at low oxygen saturation levels and low hematocrit levels. In one embodiment, the blood chamber need not include a moat as is present in conventional blood chambers.Type: GrantFiled: September 7, 2010Date of Patent: November 24, 2015Assignee: FRESENIUS MEDICAL CARE HOLDINGS, INC.Inventors: Louis L. Barrett, Perry N. Law
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Patent number: D757934Type: GrantFiled: January 27, 2015Date of Patent: May 31, 2016Assignee: FRESENIUS MEDICAL HOLDINGS, INC.Inventors: Louis L. Barrett, Perry N. Law
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Patent number: D799031Type: GrantFiled: September 9, 2015Date of Patent: October 3, 2017Assignee: Fresenius Medical Care Holdings, Inc.Inventors: Louis L. Barrett, Perry N. Law, Jorge Perez, Chris Chau
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Patent number: D979050Type: GrantFiled: October 29, 2019Date of Patent: February 21, 2023Assignee: Fresenius Medical Care Holdings, Inc.Inventors: Perry N. Law, Louis LeeGrande Barrett, Christopher Yim Chau