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David E Acker, Ian McNulty, Robert C Pacheco, Wayne Grandner: Magnetic determination of position and orientation. Biosense, Lerner David Littenberg Krumholz & Mentlik, September 24, 1996: US05558091 (621 worldwide citation)

A magnetic position and orientation determining system uses magnetic fields, desirably including uniform fields from Helmholtz coils positioned on opposite sides of a sensing volume and gradient fields generated by the same coils. By monitoring field components detected at the probes during applicat ...


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David E Acker: Magnetic location system with feedback adjustment of magnetic field generator. Biosense, Lerner David Littenberg Krumholz & Mentlik, March 17, 1998: US05729129 (428 worldwide citation)

A system for locating objects in space, such as medical instruments within the body of a patient, based upon transmission of magnetic fields from coils in a fixed frame of reference to sensors on the object or visa-versa. The current supplied to the coils is adjusted to assure that the sensors recei ...


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David E Acker, Charidimos E Gasparakis: Method and apparatus for determining position of object. Biosense, Lerner David Littenberg Krumholz & Mentlik, May 19, 1998: US05752513 (346 worldwide citation)

Apparatus for determining the position of a probe in a sensing volume includes a plurality of magnetic field generating sources for generating different magnetic fields in the sensing volume, where the sources have a planar configuration and are positioned so that they at least partially overlap one ...


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David E Acker: Method and apparatus for synthetic viewpoint imaging. Biosense, Lerner David Littenberg Krumholtz & Mentlik, January 18, 2000: US06016439 (335 worldwide citation)

Medical apparatus for synthetic view point imaging includes an instrument insertable into the body of a patient. Using tissue image information defining an image of the patient's body, and defining the position of the distal end of the instrument within the body, synthetic images of the patient's bo ...


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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 (331 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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David E Acker, Robert Pacheco, Yong Zou, Yoel Zilberstein: Independently positionable transducers for location system. Biosense, Louis J Capezzuto, September 9, 2003: US06618612 (278 worldwide citation)

A system for determining the disposition of a probe within the body of a patient includes a probe having probe field transducers and a plurality of reference field transducers. The reference field transducers are independently movable with respect to one another to desired, customizable positions cl ...


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Bharat B Pant, David E Acker, Edward Paul Harhen: Intrabody hifu applicator. Transurgical, Lerner David Littenberg Krumholz & Mentlik, October 8, 2002: US06461314 (275 worldwide citation)

An apparatus and method for applying sonic energy within the body of the living subject. A probe for applying sonic energy within the body of a subject includes a probe body having a proximal and a distal end adapted for insertion into the body of a subject, a spatially-distributed sonic transducer ...


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David E Acker: Three-axis coil sensor. Biosense, Paul A Coletti, December 12, 2000: US06161032 (250 worldwide citation)

The present invention relates to magnetic field sensors used to detect the position and orientation of medical probes within the body of a patient. The sensors of the present invention are especially adapted for use as independently positionable reference transducer assemblies.