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|United States Patent||5,383,917|
|Desai , et al.||January 24, 1995|
Multi-phase RF ablation employing a two-dimensional or three-dimensional electrode array produces a multitude of currents paths on the surface of the ablation zone. This results in a uniform lesion with a size defined by the span of the electrode array. An orthogonal electrode catheter array suitable for cardiac ablation is used in conjunction with a two-phase RF power source to produce uniform square-shaped lesions of size 1.2 cm.sup.2. Lesions of larger size are created by successive adjacent placement of the square-shaped lesions. A temperature sensor at the electrode tip allows monitoring of ablation temperature and regulation of thereof to minimize the electrode tips from being fouled by coagulum.
|Inventors:||Desai; Jawahar M. (Davis, CA), Nyo; Htay L. (San Jose, CA)|
Desai; Jawahar M.
|Filed:||July 5, 1991|
|Current U.S. Class:||607/102 ; 606/31; 606/42; 607/101; 607/122; 607/154|
|Current International Class:||A61B 18/12 (20060101); A61B 18/14 (20060101); A61N 1/06 (20060101); A61N 1/40 (20060101); A61B 18/00 (20060101); A61N 005/00 ()|
|Field of Search:||128/784,786,799,642,804 606/27,31,41,42 607/116,119,122,148,154,96,98,99,101,102|
|4660571||April 1987||Hess et al.|
Desai et al., "Orthogonal electro catheter array for mapping of endocardiac local site", Pacing and clinical electrophysiology and, vol. 14, pp. 557-574, (Apr., 1992). .
Haines and Watson, "Tissue heating during radio-frequency catheter abalation abalation", Pace and, vol. 12, 1989, pp. 962-976. .
Desai et al., "Endocardial Isochronal Patters near the Ventricular Tachycardia Site of Origin with Orthogonal Electrode Catheter Array", JACC vol. 13, No. 2, Feb. 1989, p. 167A (Abstract Only). .
Desai et al., "Two Phase Radiofrequency Ablation of Isolated Ventricular Endocardium", PACE vol. 12, Apr. 1989, Part I, p. 657 (Abstract Only). .
Desai et al., "Two Phase Radiofrequency Ablation", Journal of Pacing and Clinical Electrophysiology, vol. 14, Jul. 1991, Article No. 2987B. .
Morady et al., "Catheter Ablation of Ventricular Tachycardia with Intracardiac Shocks: results in 33 patients", Circulation, vol. 75, No. 5, May 1987, pp. 1037-1049. .
Altman, "New Therapy Combats 2 Types of Racing Heart", The New York Times National, Jun. 6, 1991, p. A16..