1
Edwin Langberg: Catheter with radiofrequency heating applicator. Sensor Electronics, August 7, 1990: US04945912 (377 worldwide citation)

Radiofrequency (RF) heating applicator, located at the distal end of a coaxial line catheter, produces deeper and more uniform heat dissipation. The active applicator element is a conductor helix fed via the coaxial line. The applicator has provisions for interception of intracardiac electrogram sig ...


2
Edwin Langberg: Method of radiofrequency ablation. Sensor Electronics, Ryan Kees & Hohenfeldt, September 21, 1993: US05246438 (359 worldwide citation)

A cardiac ablation apparatus including a solenoidal antenna, monitoring electrodes, and a coupling network at a distal end of a catheter transmission line, and another coupling network at the proximal end of the catheter transmission line to connect the catheter to the source of radiofrequency (RF) ...


3
Edwin Langberg: Radiofrequency ablation catheter. Sensor Electronics, Ryan Kees & Hohenfeldt, December 6, 1994: US05370644 (352 worldwide citation)

A cardiac ablation apparatus including a solenoidal antenna, monitoring electrodes, and a coupling network at a distal end of a catheter transmission line, and another coupling network at the proximal end of the catheter transmission line to connect the catheter to the source of radiofrequency (RF) ...


4
Edwin Langberg: Electrical heating catheter. Sensor Electronics, Ryan Kees & Hohenfeldt, July 27, 1993: US05230349 (168 worldwide citation)

The invention provides a thermal design of a catheter where the active electrode is partially covered by a heat conducting and electrically insulating heat-sink layer for localizing and controlling an electrical heating of tissue and cooling of the active electrode by convective blood flow. The inve ...


5
Edwin Langberg: Liquid metal-filled balloon. Sensor Electronics, September 28, 1993: US05248312 (142 worldwide citation)

Liquid metal gallium-filled balloon catheter is connected to a source of heating power. An improved method of hyperthermia and ablation is made possible by ease of insertion and conformity to complex intracavitary geometry by liquid metal. Closeness of gallium melting point to body temperature makes ...


6
Edwin Langberg, F Gerald Caruso: Active noise reduction system. Sensor Electronics, January 15, 1991: US04985925 (119 worldwide citation)

Improvement in active noise reduction based on a negative feedback electro-acoustical system which consists of an Electronic Earplug seated in the concha fossa combining active and passive noise reduction in the quiet zone at the ear, a bilateral transducer circuit which drives a speaker as an acous ...


7
Edwin Langberg: Electrical heating catheter. Sensor Electronics, Ryan Kees & Hohenfeldt, November 2, 1993: US05257635 (69 worldwide citation)

The invention provides a thermal design of a catheter where the active electrode is partially covered by a heat conducting and electrically insulating heat-sink layer for localizing and controlling an electrical heating of tissue and cooling of the active electrode by convective blood flow. The inve ...


8
Edwin Langberg: Ultrasonic imager. Sensor Electronics, April 6, 1993: US05199437 (63 worldwide citation)

The invention provides an intracavitary ultrasonic scanner with a helical scan. Mechanical and electronic steerable array implementations of the helical scan are described. A plastic cover sheath, filled with coupling fluid, covers the probe of the scanner. Portions of probe are porous allowing the ...


9
Edwin Langberg: Digitizer and position encoders and calibration system for same. March 11, 1986: US04575581 (37 worldwide citation)

Digitizer incorporates two novel position encoders. One position encoder comprises means for periodic spatial calibration against an accurate pattern of reference marks, thereby improving accuracy to the limit of resolution. Optionally, it also includes temperature and humidity compensation. Superio ...


10
Edwin Langberg: Piezopolymer actuators. Sensor Electronics, November 7, 1989: US04879698 (35 worldwide citation)

Piezopolymer actuator, wound in a bifilar fashion on two pins, is operated in a compressive mode without buckling. In addition to constraining motion of the winding along the surface of the pins, the pins also provide wide area electrical contacts with conductive electrodes on the surfaces of the pi ...