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Todd Fjield, Edward Paul Harhen, David E Acker, Patrick David Lopath: Thermal treatment methods and apparatus with focused energy application. Transurgical, Lerner David Littenberg Krumholz & Mentlik, October 21, 2003: US06635054 (340 worldwide citation)

A collapsible ultrasonic reflector incorporates a gas-filled reflector balloon, a liquid-filled structural balloon an ultrasonic transducer disposed within the structural balloon. Acoustic energy emitted by the transducer is reflected by a highly reflective interface between the balloons. In a cardi ...


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Todd Fjield, Edward Paul Harhen, David E Acker, Patrick David Lopath: Thermal treatment methods and apparatus with focused energy application. Prorhythm, Lerner David Littenberg Krumholz & Mentlik, August 1, 2006: US07083614 (199 worldwide citation)

A collapsible ultrasonic reflector incorporates a gas-filled reflector balloon, a liquid-filled structural balloon an ultrasonic transducer disposed within the structural balloon. Acoustic energy emitted by the transducer is reflected by a highly reflective interface between the balloons. In a cardi ...


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Yegor Sinelnikov, Yong Zou, Reinhard Warnking, James Savage, Robert C Pacheco, Jaime Merino, Patrick David Lopath, John Hotmer, Todd Fjield: Cardiac ablation devices. Recor Medical, Jones Day, Nicola A Pisano, Christopher C Bolten, November 23, 2010: US07837676 (110 worldwide citation)

A cardiac ablation device treats atrial fibrillation by directing and focusing ultrasonic waves into a ring-like ablation region (A). The device desirably is steerable and can be moved between a normal disposition, in which the ablation region lies parallel to the wall of the heart for ablating a lo ...


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Todd Fjield, Patrick David Lopath, Edward Paul Harhen: Ultrasonic transducers. Transurgical, Lerner David Littenberg Krumholz & Mentlik, July 20, 2004: US06763722 (76 worldwide citation)

A compact, high-power ultrasonic emitting transducer has an active element such as a piezoelectric element and structure defining a reflective backing interface such as an air interface behind the rear surface of the active element. A liquid is provided in the resonant unit between the backing inter ...


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Todd Fjield, Edward Paul Harhen, David E Acker, Patrick David Lopath: Thermal treatment methods and apparatus with focused energy application. ProRhythm, Lerner David Littenberg Krumholz & Mentlik, February 5, 2008: US07326201 (70 worldwide citation)

A collapsible ultrasonic reflector incorporates a gas-filled reflector balloon, a liquid-filled structural balloon an ultrasonic transducer disposed within the structural balloon. Acoustic energy emitted by the transducer is reflected by a highly reflective interface between the balloons. In a cardi ...


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Bharat B Pant, Emad S Ebbini, David E Acker, Edward Paul Harhen, Todd Fjield: Ultrasonic transducer, transducer array, and fabrication method. Transurgical, Lerner David Littenberg Krumholz & Mentlik, December 10, 2002: US06492762 (43 worldwide citation)

A multi-layer piezoelectric transducer includes a first polymeric layer of piezoelectric material having spaced apart first and second surfaces and a second polymeric layer of piezoelectric material having spaced apart first and second surfaces. A first ground layer overlies the first surface of the ...


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Todd Fjield, Michael J Higgins: Monitoring and compensating for temperature-related error in an electrochemical sensor. Edwards Lifesciences Corporation, Klarquist Sparkman, August 16, 2011: US08000918 (40 worldwide citation)

A method for compensating for a temperature-related error in an electrochemical sensor without using separate sources of temperature measurement by measuring sensor current, temporarily lowering sensor voltage to a first level below a reaction-sustaining threshold, measuring a first offset current, ...


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Mark Wagshul, Todd Fjield: Interleaved operation of MRI and electronic equipment. Transurgical, Lerner David Littenberg Krumholz & Mentlik, December 31, 2002: US06501978 (36 worldwide citation)

An electrical appliance such as an ultrasonic energy applicator used in conjunction with magnetic resonance apparatus is controlled so that the appliance is active only while the magnetic resonance signals from the subject are not being received. Alternatively, magnetic resonance signals received wh ...


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Kullervo Hynynen, Douglas R Daum, Mark T Buchanan, Todd Fjield: Transmyocardial revascularization using ultrasound. Brigham and Women&apos s Hospital, Lahive & Cockfield, January 28, 2003: US06511444 (16 worldwide citation)

A method and apparatus for performing transmyocardial revascularization using ultrasound is disclosed. The apparatus includes a phased array ultrasonic device that includes a plurality of ultrasonic transducer elements which are controlled using a feedback control system so that each ultrasonic tran ...