Patents by Inventor Jawahar M. Desai

Jawahar M. Desai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6522905
    Abstract: A system and method for cardiac mapping and ablation include a multi-electrode catheter introduced percutaneously into a subject's heart and deployable adjacent to various endocardial sites. The electrodes are connectable to a mapping unit, an ablation power unit a pacing unit, all of which are under computer control. Intracardiac electrogram signals emanated from a tachycardia site of origin are detectable by the electrodes. Their arrival times are processed to generate various visual maps to provide real-time guidance for steering the catheter to the tachycardia site of origin. In another aspect, the system also include a physical imaging system which is capable of providing different imaged physical views of the catheter and the heart. These physical views are incorporated into the various visual maps to provide a more physical representation. once the electrodes are on top of the tachycardia site of origin, electrical energy is supplied by the ablation power unit to effect ablation.
    Type: Grant
    Filed: August 6, 2001
    Date of Patent: February 18, 2003
    Inventor: Jawahar M. Desai
  • Publication number: 20020010392
    Abstract: A system and method for cardiac mapping and ablation include a multi-electrode catheter introduced percutaneously into a subject's heart and deployable adjacent to various endocardial sites. The electrodes are connectable to a mapping unit, an ablation power unit a pacing unit, all of which are under computer control. Intracardiac electrogram signals emanated from a tachycardia site of origin are detectable by the electrodes. Their arrival times are processed to generate various visual maps to provide real-time guidance for steering the catheter to the tachycardia site of origin. In another aspect, the system also include a physical imaging system which is capable of providing different imaged physical views of the catheter and the heart. These physical views are incorporated into the various visual maps to provide a more physical representation. Once the electrodes are on top of the tachycardia site of origin, electrical energy is supplied by the ablation power unit to effect ablation.
    Type: Application
    Filed: August 6, 2001
    Publication date: January 24, 2002
    Inventor: Jawahar M. Desai
  • Publication number: 20010051803
    Abstract: 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 cm2. 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. In another embodiment, an external auxiliary electrode is used in combination with the catheter electrodes. This also produces lesions of greater depth. In yet another embodiment, ablation is performed with a sequence of elementary electrode-electrical configurations.
    Type: Application
    Filed: August 3, 2001
    Publication date: December 13, 2001
    Inventors: Jawahar M. Desai, Htay L. Nyo
  • Patent number: 6052612
    Abstract: An improved endocardial catheter includes a plurality of longitudinally extending openings adjacent intermediate portions at its distal end. The catheter is actuable from a retracted or collapsed mode, wherein the sealed openings are arranged around the tubular catheter surface, to an expanded mode. The plurality of longitudinal openings in the catheter wall enable radial expansion of the tubular surface at the distal end so that intermediate portions of the tubular catheter surface are moved to an operative position radially outward from their position in the retracted mode. In the expanded position, the intermediate portions form wings around the distal end, revealing a cavity within the tubular catheter for the release of contrast material or other fluid into endocardial sites through the longitudinal openings.
    Type: Grant
    Filed: March 27, 1998
    Date of Patent: April 18, 2000
    Inventor: Jawahar M. Desai
  • Patent number: 5857464
    Abstract: An improved endocardial catheter includes a plurality of longitudinally extending openings adjacent intermediate portions at its distal end. The catheter is actuable from a retracted or collapsed mode, wherein the sealed openings are arranged around the tubular catheter surface, to an expanded mode. The plurality of longitudinal openings in the catheter wall enable radial expansion of the tubular surface at the distal end so that intermediate portions of the tubular catheter surface are moved to an operative position radially outward from their position in the retracted mode. In the expanded position, the intermediate portions form wings around the distal end, revealing a cavity within the tubular catheter for the release of contrast material or other fluid into endocardial sites through the longitudinal openings.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: January 12, 1999
    Inventor: Jawahar M. Desai
  • Patent number: 5693078
    Abstract: 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.
    Type: Grant
    Filed: October 5, 1994
    Date of Patent: December 2, 1997
    Assignee: Jawahar M. Desai
    Inventors: Jawahar M. Desai, Htay L. Nyo
  • Patent number: 5657755
    Abstract: A system and method for cardiac mapping and ablation include a multi-electrode catheter introduced percutaneously into a subject's heart and deployable adjacent to various endocardial sites. The electrodes are connectable to a mapping unit, an ablation power unit a pacing unit, all of which are under computer control. Intracardiac electrogram signals emanated from a tachycardia site of origin are detectable by the electrodes. Their arrival times are processed to generate various visual maps to provide real-time guidance for steering the catheter to the tachycardia site of origin. In another aspect, the system also include a physical imaging system which is capable of providing different imaged physical views of the catheter and the heart. These physical views are incorporated into the various visual maps to provide a more physical representation. Once the electrodes are on top of the tachycardia site of origin, electrical energy is supplied by the ablation power unit to effect ablation.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: August 19, 1997
    Inventor: Jawahar M. Desai
  • Patent number: 5620481
    Abstract: 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. In another embodiment, an external auxiliary electrode is used in combination with the catheter electrodes. This also produces lesions of greater depth. In yet another embodiment, ablation is performed with a sequence of elementary electrode-electrical configurations.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: April 15, 1997
    Inventors: Jawahar M. Desai, Htay L. Nyo
  • Patent number: 5500011
    Abstract: A multipolar electrode catheter includes a central and four side electrodes at its distal end. The catheter is actuable from a retracted or collapsed mode wherein the side electrodes are arranged around the tubular catheter outer surface to an expanded mode. A plurality of longitudinal slits in the catheter wall enable radial expansion of the distal end so that the side electrodes are moved to an operative position radially outward from their position in the retracted mode. In the expanded position, the side electrodes lie in the same plane and equally spaced from adjacent electrodes. Electrode leads connected to the electrodes enable the electrodes to be used both for mapping and ablation of endocardial sites.
    Type: Grant
    Filed: November 4, 1994
    Date of Patent: March 19, 1996
    Inventor: Jawahar M. Desai
  • Patent number: 5433198
    Abstract: A system and method for cardiac mapping and ablation includes a multi-electrode catheter introduced percutaneously into a subject's heart and deployable adjacent to various endocardial sites. The electrodes are connectable to a mapping unit, an ablation power unit a pacing unit, all of which are under computer control. Intracardiac electrogram signals emanated from a tachycardia site of origin are detectable by the electrodes. Their arrival times are processed to generate various visual maps to provide real-time guidance for steering the catheter to the tachycardia site of origin. In another aspect, the system also include a physical imaging system which is capable of providing different imaged physical views of the catheter and the heart. These physical views are incorporated into the various visual maps to provide a more physical representation. Once the electrodes are on top of the tachycardia site of origin, electrical energy is supplied by the ablation power unit to effect ablation.
    Type: Grant
    Filed: March 11, 1993
    Date of Patent: July 18, 1995
    Inventor: Jawahar M. Desai
  • Patent number: 5397339
    Abstract: A multipolar electrode catheter includes a central and four side electrodes at its distal end. The catheter is actuable from a retracted or collapsed mode wherein the side electrodes are arranged around the tubular catheter outer surface to an expanded mode. A plurality of longitudinal slits in the catheter wall enable radial expansion of the distal end so that the side electrodes are moved to an operative position radially outward from their position in the retracted mode. In the expanded position, the side electrodes lie in the same plane and equally spaced from adjacent electrodes. Electrode leads connected to the electrodes enable the electrodes to be used both for mapping and ablation of endocardial sites.
    Type: Grant
    Filed: May 7, 1993
    Date of Patent: March 14, 1995
    Inventor: Jawahar M. Desai
  • Patent number: 5383917
    Abstract: 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.
    Type: Grant
    Filed: July 5, 1991
    Date of Patent: January 24, 1995
    Assignee: Jawahar M. Desai
    Inventors: Jawahar M. Desai, Htay L. Nyo
  • Patent number: 5365926
    Abstract: A multipolar electrode catheter includes a central and a plurality of side electrodes at its distal end. The catheter is actuable from a retracted or collapsed mode wherein the side electrodes are arranged around the tubular catheter outer surface to an expanded mode substantially coplanar with the central electrode. A plurality of longitudinal slits in the catheter wall enable radial expansion of the distal end so that the side electrodes are moved to an operative position radially outward from their position in the retracted mode. In the expanded position, the side electrodes lie in the same plane and equally spaced from adjacent electrodes. Electrode leads connected to the electrodes enable the electrodes to be used both for mapping and ablation of endocardial sites.
    Type: Grant
    Filed: October 13, 1992
    Date of Patent: November 22, 1994
    Inventor: Jawahar M. Desai
  • Patent number: 5231995
    Abstract: A multipolar electrode catheter includes a central and four side electrodes at its distal end. The catheter is actuable from a retracted or collapsed mode wherein the side electrodes are arranged around the tubular catheter outer surface to an expanded mode. A plurality of longitudinal slits in the catheter wall enable radial expansion of the distal end so that the side electrodes are moved to an operative position radially outward from their position in the retracted mode. In the expanded position, the side electrodes lie in the same plane and equally spaced from adjacent electrodes. Electrode leads connected to the electrodes enable the electrodes to be used both for mapping and ablation of endocardial sites.
    Type: Grant
    Filed: September 30, 1992
    Date of Patent: August 3, 1993
    Inventor: Jawahar M. Desai
  • Patent number: 5215103
    Abstract: A multipolar electrode catheter includes a central and four side electrodes at its distal end. The catheter is actuable from a retracted or collapsed mode wherein the side electrodes are arranged around the tubular catheter outer surface to an expanded mode. A plurality of longitudinal slits in the catheter wall enable radial expansion of the distal end so that the side electrodes are moved to an operative position radially outward from their position in the retracted mode. In the expanded position, the side electrodes lie in the same plane and equally spaced from adjacent electrodes. Electrode leads connected to the electrodes enable the electrodes to be used both for mapping and ablation of endocardial sites.
    Type: Grant
    Filed: September 13, 1989
    Date of Patent: June 1, 1993
    Inventor: Jawahar M. Desai
  • Patent number: 4940064
    Abstract: A multipolar electrode catheter includes a central and four side electrodes at its distal end. The catheter is actuable from a retracted or collapsed mode wherein the side electrodes are arranged around the tubular catheter outer surface to an expanded mode. A plurality of longitudinal slits in the catheter wall enable radial expansion of the distal end so that the side electrodes are moved to an operative position radially outward from their position in the retracted mode. In the expanded position, the side electrodes lie in the same plane and equally spaced from adjacent electrodes. Electrode leads connected to the electrodes enable the electrodes to be used both for mapping and ablation of endocardial sites.
    Type: Grant
    Filed: June 30, 1987
    Date of Patent: July 10, 1990
    Inventor: Jawahar M. Desai