Patents by Inventor Scott Matthew Chetham
Scott Matthew Chetham 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: 20160135741Abstract: Compact and lightweight, non-invasive apparatuses to determine tissue wetness/hydration based on the frequency responses of regions of the tissue below a sensor of the apparatus. Described herein are compact and lightweight apparatuses having a sensor with an array of electrodes that is directly connected or connectable to control circuitry to attach to the back of the sensor, which can be worn by a patient. The control circuitry may include a multiplexer (MUX) coordinating the reciprocal selection of drive and sensing electrodes, and a one or more constant current sources. Methods of using these devices to detect tissue wetness are also described.Type: ApplicationFiled: July 1, 2014Publication date: May 19, 2016Inventors: Scott Matthew CHETHAM, Paul J. ERLINGER, Alfonso L. DE LIMON, Eniko SRIVASTAVA
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Publication number: 20160051190Abstract: Non-invasive devices and systems to determine tissue wetness/hydration based on relative changes in subsurface resistivities in tissue below an electrode array applied to a human body across different frequencies. For example, these a sensor including arrays of current-injecting and voltage-sensing electrodes may be placed on a subject's back to determine lung wetness. Systems and methods for determining tissue water content, systems and methods for determining lung wetness, sensors for determining relative changes in subsurface resistivities across frequencies and systems and methods to determine which arrays of electrodes in a sensor to use to determine relative changes in subsurface resistivities across frequencies are all described.Type: ApplicationFiled: August 31, 2015Publication date: February 25, 2016Inventors: Alfonso L. de Limon, Scott Matthew CHETHAM, Paul J. ERLINGER
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Patent number: 8781551Abstract: A method of monitoring pulmonary oedema in a subject using a processing system. The method includes, determining a measured impedance value for at least two body segments, at least one of the body segments being a thoracic cavity segment. For each body segment, the measured impedance values are used to determine an index, which is in turn used to determine the presence, absence or degree of pulmonary oedema using the determined indices.Type: GrantFiled: June 30, 2006Date of Patent: July 15, 2014Assignee: Impedimed LimitedInventor: Scott Matthew Chetham
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Patent number: 8660629Abstract: A method of monitoring pulmonary oedema in a subject using a processing system. The method includes, determining a measured impedance value for at least two body segments, at least one of the body segments being a thoracic cavity segment. For each body segment, the measured impedance values are used to determine an index, which is in turn used to determine the presence, absence or degree of pulmonary oedema using the determined indices.Type: GrantFiled: June 30, 2006Date of Patent: February 25, 2014Assignee: Impedimed LimitedInventor: Scott Matthew Chetham
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Patent number: 8509886Abstract: A method of analysing cardiac functions in a subject using a processing system is described. The method may include applying one or more electrical signals having a plurality of frequencies to the subject and detecting a response to the applied one or more signals from the subject. A characteristic frequency can then be determined from the applied and received signals, and at least one component of the impedance (e.g., reactance, phase shift) can be measured at the characteristic frequency. The impedance or a component of impedance at a characteristic frequency can be determined for a number of sequential time instances. A new characteristic frequency may be determined within a cardiac cycle or the same characteristic frequency may be used throughout the cardiac cycle during which instantaneous values of impedance are determined. These values may be used to determine an indicia of cardiac function.Type: GrantFiled: November 28, 2011Date of Patent: August 13, 2013Assignee: Aorora Technologies Pty LtdInventor: Scott Matthew Chetham
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Publication number: 20120071772Abstract: A method of analysing cardiac functions in a subject using a processing system is described. The method may include applying one or more electrical signals having a plurality of frequencies to the subject and detecting a response to the applied one or more signals from the subject. A characteristic frequency can then be determined from the applied and received signals, and at least one component of the impedance (e.g., reactance, phase shift) can be measured at the characteristic frequency. The impedance or a component of impedance at a characteristic frequency can be determined for a number of sequential time instances. A new characteristic frequency may be determined within a cardiac cycle or the same characteristic frequency may be used throughout the cardiac cycle during which instantaneous values of impedance are determined. These values may be used to determine an indicia of cardiac function.Type: ApplicationFiled: November 28, 2011Publication date: March 22, 2012Inventor: Scott Matthew Chetham
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Patent number: 8068906Abstract: A method of analyzing cardiac functions in a subject using a processing system is described. The method may include applying one or more electrical signals having a plurality of frequencies to the subject and detecting a response to the applied one or more signals from the subject. A characteristic frequency can then be determined from the applied and received signals, and at least one component of the impedance (e.g., reactance, phase shift) can be measured at the characteristic frequency. Thus, the impedance or a component of impedance at a characteristic frequency can be determined for a number of sequential time instances. A new characteristic frequency may be determined within a cardiac cycle (e.g., with each sequential time instant) or the same characteristic frequency may be used throughout the cardiac cycle during which instantaneous values of impedance (or a component of impedance) are determined. These instantaneous values may be used to determine one or more indicia of cardiac function.Type: GrantFiled: July 11, 2007Date of Patent: November 29, 2011Assignee: Aorora Technologies Pty LtdInventor: Scott Matthew Chetham
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Publication number: 20090143663Abstract: A method of monitoring pulmonary oedema in a subject using a processing system. The method includes, determining a measured impedance value for at least two body segments, at least one of the body segments being a thoracic cavity segment. For each body segment, the measured impedance values are used to determine an index, which is in turn used to determine the presence, absence or degree of pulmonary oedema using the determined indices.Type: ApplicationFiled: June 30, 2006Publication date: June 4, 2009Applicant: IMPEDANCE CARDIOLOGY SYSTEMS INC.Inventor: Scott Matthew Chetham
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Publication number: 20090082679Abstract: A method of analyzing cardiac functions in a subject using a processing system. The method includes causing one or more electrical signals to be applied to the subject using a first set of electrodes, the one or more electrical signals having a plurality of frequencies. The method includes determining an indication of electrical signals measured across a second set of electrodes applied to the subject in response to the applied one or more signals. Following this, and for a number of sequential time instances, the method includes determining from the indicating data and the one or more applied signals, an instantaneous impedance value at each of the plurality of frequencies, and determining, using the using instantaneous impedance values, an intracellular impedance parameter. The intracellular impedance parameter over at least one cardiac cycle is the used to determine one or more parameters relating to cardiac function.Type: ApplicationFiled: June 21, 2005Publication date: March 26, 2009Applicant: Impedance Cardiology Systems, Inc.Inventor: Scott Matthew Chetham
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Publication number: 20080287823Abstract: A method of determining an index indicative of the presence, absence or degree of left ventricular hypertrophy in a subject. The method includes using a processing system to determine a measured impedance value for at least one body segment. For each body segment the measured impedance values are used to determine at least one impedance parameter, which are then used to determine a fat-free mass for the subject. The fat free mass can then be used as the index.Type: ApplicationFiled: July 19, 2006Publication date: November 20, 2008Inventor: Scott Matthew Chetham