Sonometrics Corporation

Other

Ivan Vesely

Wayne L Smith

George J Klein

Daniel Burkhoff

Andrew W Gubbels

Marshall Edge

A pseudo-random number generating circuit and method, comprising: a plurality of pseudo-random number generator (PRNG) units combined in a cascade structure of several layers to produce a pseudo-random output stream, the PRNG units of any given layer running more slowly than those PRNG units of more downstream layers of the cascade structure and running more quickly than those PRNG units of more upstream layers of the cascade structure, the PRNG units including a relatively slow but cryptographically very secure PRNG unit feeding the most upstream layer of the cascade structure, and very fast, but possibly cryptographically insecure PRNG unit at the most downstream layer.

Cascaded stream cipher

A method for carrying out a medical procedure using a 3-D tracking and imaging system (,). A surgical instrument, such as a catheter, probe, sensor, pacemaker lead, needle, or the like is inserted into a living being, and the position of the surgical instrument is tracked as it moves through a medium in a bodily structure. The location of the surgical instrument relative to its immediate surroundings is displayed to improve a physician's ability to precisely position the surgical instrument. The medical procedures including targeted drug delivery, sewing sutures, removal of an obstruction from the circulatory system, a biopsy, amniocentesis, brain surgery, measurement of cervical dilation, evaluation of knee stability, assessment of myocardial contractibility, eye surgery, prostate surgery, trans-myocardial revascularization (TMR), robotic surgery, and evaluation of RF transmissions.

Method for carrying out a medical procedure using a three-dimensional tracking and imaging system

A 3-D tracking and imaging system (1600) for tracking the position of a surgical instrument (e.g., a catheter, probe, a sensor, needle or the like) inserted into a body, and displaying a 3-D image showing the position of the surgical instrument in reference to a 3-D image of the environment surrounding the surgical instrument. The 3-D tracking and imaging system (1600) aiding a physician in the guidance of the surgical instrument inside the body.

Three-dimensional tracking and imaging system

A system for carrying out surgery on a bodily structure (e.g., breast and liver) with greater precision, accuracy, comfort and minimal invasiveness. A 3-dimensional tracking and imaging system (1000) is used to obtain an accurate position of an instrument as it is maneuvered by an operator, and to mark a location on the subject bodily structure. The system is particularly advantageous for surgical procedures for biopsying and destroying tumors in bodily structures which are easily deformable.

System for carrying out surgery, biopsy and ablation of a tumor or other

A tracking data sheath (20,20',100) arrangable on a variety of different surgical instruments (e.g., catheters and probes) to provide the surgical instruments with 3-D tracking capability. The tracking data sheath (20,20',100) being generally elastomeric or rigid for convenient installation and removal, and having transducers (30) and conductors (32) embedded therein.

Tracking data sheath

A system for displaying a 2-D ultrasound image in a 3-D viewing environment. Within the same 3-D viewing environment, various surgical instruments can be tracked and displayed, thus correlating 3-D virtual surgery with ultrasound imaging for verification. A detachable housing (220) containing position transducers (222) is attached to a conventional 2-D ultrasound imaging head (200) to provide position data of an imaging plane generated by an image transducer (204).

System for displaying a 2-D ultrasound image within a 3-D viewing

A method for carrying out a medical procedure using a 3-D tracking and imaging system (1600). A surgical instrument, such as a catheter, probe, sensor, needle or the like is inserted into a living being, and the position of the surgical instrument is tracked as it moves through a medium in a bodily structure. The location of the surgical instrument relative to its immediate surroundings is displayed to improve a physician's ability to precisely position the surgical instrument. The medical procedures including removal of an obstruction from the circulatory system, a biopsy, amniocentesis, brain surgery, measurement of cervical dilation, evaluation of knee stability, assessment of myocardial contractibility, eye surgery, prostate surgery and transmyocardial myocardial revascularization (TMR). In addition, the method of the present invention also finds use in connection with the generation of 2-D echo planes.

Method for carrying out a medical procedure using a three-dimensional

A device having a combined electrode (20) and position tracking transducer (30) mounted to a surgical instrument, such as a catheter (10). In a preferred embodiment of the invention, the electrode (20) serves dual functions, namely as a standard ECG electrode for communicating an ECG voltage, and as an electrode transducer, such as a conductor for a transducer. The combined ECG electrode and position tracking transducer minimizes the amount of space needed on the surgical instrument and the number of required components.

System for sharing electrocardiogram electrodes and transducers

A system for determining a time delay of a signal propagating through a medium. The time delay is used to determine the distance between transducers arrangable within a body. One or more Digital Signal Processors (DSP) are programmed to recognize various waveform patterns by matching a received waveform to a template waveform.

Ultrasound-based 3-D tracking system using a digital signal processor

A method and apparatus for simultaneous measurement of multiple distances by means of networked piezoelectric transducers. Through the use of high frequency digital counters, the propagation delay between the activation of an ultrasonic transducer and the reception by similar transducers is quickly and accurately defined. By alternating the duty cycle between transmit and receive modes, the system can track and triangulate the three-dimensional positions for each transducer.

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Cleveland Heights, OH, United States of America

Ivan Vesely