Patents by Inventor Robert H. Dahla

Robert H. Dahla 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: 8323279
    Abstract: An electrosurgical instrument with a movable fluid delivery sheath assembly for variable fluid supply during surgical procedures is disclosed. The instrument comprises at least one active electrode and at least one return electrode, positioned on the instrument distal end. The sheath assembly has an outer sheath that is external to the instrument shaft, to provide a lumen. The sheath assembly lumen is axially movable between first and second positions relative to a fluid delivery element, for varying target site treatment and fluid delivery. In the first position the shaft distal end is axially distal to a leading edge of the sheath assembly. In the second position the sheath assembly distal leading edge is positioned axially adjacent or distal to the end of the shaft. The fluid delivery element comprises an inner lumen extending through at least a portion of the shaft, and at least one port extending radially through the shaft. The port is in communication with the inner lumen.
    Type: Grant
    Filed: September 25, 2009
    Date of Patent: December 4, 2012
    Assignee: ArthoCare Corporation
    Inventors: Robert H. Dahla, Irma Gutierrez
  • Patent number: 8317786
    Abstract: An electrosurgical instrument having active and return electrodes with a movable suction sheath for variable fluid and debris removal during surgical procedures is disclosed. The suction apparatus has an outer sheath that is external to a shaft to provide a lumen. The sheath assembly is axially movable relative to the fluid aspiration element between first and second positions for treating the target site and fluid and debris removal, respectively. The first position positions the distal end of the shaft axially distal to a leading edge of the sheath assembly. The second position positions the distal leading edge of the sheath assembly axially adjacent to the end of the shaft. The fluid aspiration element comprises an inner lumen extending through the shaft, and at least one port extending radially through the shaft. The port is in communication with the inner lumen. A vacuum provides suction through the port and inner lumen.
    Type: Grant
    Filed: September 25, 2009
    Date of Patent: November 27, 2012
    Assignee: AthroCare Corporation
    Inventors: Robert H. Dahla, Irma Gutierrez
  • Patent number: 8012153
    Abstract: Electrosurgical systems, apparatus, and methods for the controlled removal and treatment of a target tissue. An instrument of the invention includes a rotating member housed longitudinally within a shaft, a tissue removal port disposed at the shaft distal end portion, and an active electrode disposed at the instrument distal end. The active electrode is adapted to electrosurgically remove at least a portion of the target tissue as the rotating member rotates within the shaft. According to alternative embodiments, the active electrode may be disposed on the rotating member or on the shaft.
    Type: Grant
    Filed: July 16, 2004
    Date of Patent: September 6, 2011
    Assignee: ArthroCare Corporation
    Inventors: Jean Woloszko, Robert H. Dahla
  • Patent number: 7988689
    Abstract: Apparatus and methods for ablating, severing, cutting, shrinking, coagulating, or otherwise modifying a target tissue to be treated. In a method for treating a target tissue, an active electrode of an electrosurgical probe is positioned in at least close proximity to the target tissue in the presence of an electrically conductive fluid. A high frequency voltage is then applied between the active electrode and a return electrode, wherein, the high frequency voltage is sufficient to volumetrically remove (ablate), sever, or modify at least a portion of the target tissue. The probe comprises a multi-lumen shaft having a plurality of internal lumens, and a return electrode coil oriented substantially parallel to the shaft distal end. The active electrode may be in the form of a metal disc, a hook, or an active electrode coil. In the latter embodiment, the active electrode coil is typically arranged substantially orthogonal to the return electrode coil.
    Type: Grant
    Filed: September 17, 2007
    Date of Patent: August 2, 2011
    Assignee: ArthroCare Corporation
    Inventors: Jean Woloszko, Robert H. Dahla
  • Publication number: 20110077643
    Abstract: An electrosurgical instrument having active and return electrodes with a movable suction sheath for variable fluid and debris removal during surgical procedures is disclosed. The suction apparatus has an outer sheath that is external to a shaft to provide a lumen. The sheath assembly is axially movable relative to the fluid aspiration element between first and second positions for treating the target site and fluid and debris removal, respectively. The first position positions the distal end of the shaft axially distal to a leading edge of the sheath assembly. The second position positions the distal leading edge of the sheath assembly axially adjacent to the end of the shaft. The fluid aspiration element comprises an inner lumen extending through the shaft, and at least one port extending radially through the shaft. The port is in communication with the inner lumen. A vacuum provides suction through the port and inner lumen.
    Type: Application
    Filed: September 25, 2009
    Publication date: March 31, 2011
    Inventors: Robert H. Dahla, Irma Gutierrez
  • Publication number: 20110077646
    Abstract: An electrosurgical instrument with a movable fluid delivery sheath assembly for variable fluid supply during surgical procedures is disclosed. The instrument comprises at least one active electrode and at least one return electrode, positioned on the instrument distal end. The sheath assembly has an outer sheath that is external to the instrument shaft, to provide a lumen. The sheath assembly lumen is axially movable between first and second positions relative to a fluid delivery element, for varying target site treatment and fluid delivery. In the first position the shaft distal end is axially distal to a leading edge of the sheath assembly. In the second position the sheath assembly distal leading edge is positioned axially adjacent or distal to the end of the shaft. The fluid delivery element comprises an inner lumen extending through at least a portion of the shaft, and at least one port extending radially through the shaft. The port is in communication with the inner lumen.
    Type: Application
    Filed: September 25, 2009
    Publication date: March 31, 2011
    Inventors: Robert H. Dahla, Irma Gutierrez
  • Publication number: 20100204690
    Abstract: Systems and methods for securing a screen-type active electrode to the distal tip of an electrosurgical device used for selectively applying electrical energy to a target location within or on a patient's body. A securing electrode is disposed through the screen electrode and mechanically joined to an insulative support body while also creating an electrical connection and mechanical enagement with the screen electrode. The electrosurgical device and related methods are provided for resecting, cutting, partially ablating, aspirating or otherwise removing tissue from a target site, and ablating the tissue in situ. The present methods and systems are particularly useful for removing tissue within joints, e.g., synovial tissue, meniscus, articular cartilage and the like.
    Type: Application
    Filed: December 7, 2009
    Publication date: August 12, 2010
    Applicant: ARTHROCARE CORPORATION
    Inventors: Robert Bigley, Alana Fulvio, Duane W. Marion, Jean Woloszko, Robert H. Dahla
  • Patent number: 7632267
    Abstract: An electrosurgical apparatus for performing a surgical procedure on a target site, comprising a shaft having a distal end portion, the distal end portion comprising an active electrode including a fuse leg, the fuse leg adapted to break and disable the instrument upon applying a voltage differential between the active electrode and a return electrode for a predetermined amount of time. In another embodiment, the present invention is a method of performing an electrosurgical procedure on a target tissue, comprising: placing an electrosurgical instrument in close proximity to the target tissue, the electrosurgical instrument comprising an active electrode having a pre-selected portion adapted to break and disable the instrument upon applying a voltage differential thereto for a working time; and applying the voltage differential.
    Type: Grant
    Filed: July 6, 2005
    Date of Patent: December 15, 2009
    Assignee: ArthroCare Corporation
    Inventor: Robert H. Dahla
  • Patent number: 7435247
    Abstract: Systems and methods are provided for applying a high frequency voltage in the presence of an electrically conductive fluid. High frequency voltage is then applied between the active electrode(s) and one or more return electrode(s) to volumetrically remove or ablate at least a portion of the target tissue. In one embodiment a tissue treatment surface includes spacers or a chamber for containing the electrodes.
    Type: Grant
    Filed: June 27, 2002
    Date of Patent: October 14, 2008
    Assignee: ArthroCare Corporation
    Inventors: Jean Woloszko, Michael A. Baker, Robert H. Dahla, Hardev Kahlon, Adelina Villaruel, Cindy Truc Nguyen, Irma Gutierrez
  • Patent number: 7419488
    Abstract: The present invention provides systems, apparatus, and methods for dissecting, resecting, severing, cutting, contracting, coagulating, or otherwise modifying a tissue or organ of a patient. An apparatus of the invention includes an electrosurgical probe configurable between an open configuration and a closed configuration, the probe including an active electrode terminal, a fixed return electrode disposed proximal to the active electrode terminal, and a movable return electrode configured to move linearly with respect to the active electrode terminal between the open configuration and the closed configuration. A method of the present invention comprises clamping a blood vessel between the active electrode terminal and the movable return electrode, coagulating the clamped blood vessel by application of a first high frequency voltage, and severing the coagulated blood vessel by application of a second high frequency voltage.
    Type: Grant
    Filed: January 3, 2005
    Date of Patent: September 2, 2008
    Assignee: ArthroCare Corporation
    Inventors: Scott A. Ciarrocca, Francois Antounian, Jean Woloszko, Robert H. Dahla
  • Patent number: 7297143
    Abstract: Systems, apparatus, and methods for monitoring temperature at a region near a surgical site during a procedure. A temperature-indicating element of an electrosurgical device comprises an indicator composition adapted to undergo a change in appearance in response to a pre-defined temperature range. The change in appearance of the temperature-indicating element indicates to the operator of the device a temperature condition at the working end of the device.
    Type: Grant
    Filed: February 5, 2004
    Date of Patent: November 20, 2007
    Assignee: ArthroCare Corporation
    Inventors: Jean Woloszko, Robert H. Dahla, Michael A. Baker, James L. Pacek
  • Patent number: 7270661
    Abstract: Apparatus and methods for ablating, severing, cutting, shrinking, coagulating, or otherwise modifying a target tissue to be treated. In a method for treating a target tissue, an active electrode of an electrosurgical probe is positioned in at least close proximity to the target tissue in the presence of an electrically conductive fluid. A high frequency voltage is then applied between the active electrode and a return electrode, wherein, the high frequency voltage is sufficient to volumetrically remove (ablate), sever, or modify at least a portion of the target tissue. The probe comprises a multi-lumen shaft having a plurality of internal lumens, and a return electrode coil oriented substantially parallel to the shaft distal end. The active electrode may be in the form of a metal disc, a hook, or an active electrode coil. In the latter embodiment, the active electrode coil is typically arranged substantially orthogonal to the return electrode coil.
    Type: Grant
    Filed: February 5, 2002
    Date of Patent: September 18, 2007
    Assignee: ArthoCare Corporation
    Inventors: Robert H. Dahla, Jean Woloszko
  • Patent number: 7186234
    Abstract: Apparatus and methods for ablating, severing, cutting, shrinking, coagulating, or otherwise modifying a target tissue to be treated. In a method for treating a target tissue, an active electrode of an electrosurgical probe is positioned in at least close proximity to the target tissue in the presence of an electrically conductive fluid. A high frequency voltage is then applied between the active electrode and a return electrode, wherein, the high frequency voltage is sufficient to volumetrically remove (ablate), sever, or modify at least a portion of the target tissue. The probe comprises a multi-lumen shaft having a plurality of internal lumens, and a return electrode coil oriented substantially parallel to the shaft distal end. The active electrode may be in the form of a metal disc, a hook, or an active electrode coil. In the latter embodiment, the active electrode coil is typically arranged substantially orthogonal to the return electrode coil.
    Type: Grant
    Filed: February 5, 2002
    Date of Patent: March 6, 2007
    Assignee: ArthroCare Corporation
    Inventors: Robert H. Dahla, Jean Woloszko
  • Patent number: 6949096
    Abstract: Electrosurgical methods, systems, and apparatus for the controlled ablation of tissue from a target site of a patient. An electrosurgical apparatus of the invention includes an active electrode assembly having an active electrode screen surrounded by a plurality of flow protectors. Each flow protector defines a shielded region of the active electrode screen, each shielded region of the screen characterized by enhanced plasma formation. The active electrode assembly is adapted for removing tissue from a surgical site, and the active electrode screen is adapted for digesting fragments of resected tissue. In one embodiment, the apparatus is particularly suited to simultaneously removing both hard and soft tissue in, or around, a joint.
    Type: Grant
    Filed: January 21, 2003
    Date of Patent: September 27, 2005
    Assignee: Arthrocare Corporation
    Inventors: Terry S. Davison, Theodore C. Ormsby, Jean Woloszko, Robert H. Dahla
  • Patent number: 6837888
    Abstract: The present invention provides systems, apparatus, and methods for dissecting, resecting, severing, cutting, contracting, coagulating, or otherwise modifying a tissue or organ of a patient. An apparatus of the invention includes an electrosurgical probe configurable between an open configuration and a closed configuration, the probe including an active electrode terminal, a fixed return electrode disposed proximal to the active electrode terminal, and a movable return electrode configured to move linearly with respect to the active electrode terminal between the open configuration and the closed configuration. A method of the present invention comprises clamping a blood vessel between the active electrode terminal and the movable return electrode, coagulating the clamped blood vessel by application of a first high frequency voltage, and severing the coagulated blood vessel by application of a second high frequency voltage.
    Type: Grant
    Filed: February 25, 2002
    Date of Patent: January 4, 2005
    Assignee: Arthrocare Corporation
    Inventors: Scott A. Ciarrocca, Francois Antounian, Jean Woloszko, Robert H. Dahla
  • Publication number: 20040230190
    Abstract: Systems, apparatus, and methods for ablating, sculpting, severing, shrinking, coagulating, or otherwise modifying a target tissue to be treated. In a method for treating a target tissue, an active electrode terminal of an electrosurgical probe is positioned in at least close proximity to the target tissue. A high frequency voltage is then applied between the active electrode and a return electrode, wherein, the high frequency voltage is sufficient to volumetrically remove (ablate), sever, or modify at least a portion of the target tissue. The probe comprises an electrode assembly including an electrode support and at least one active electrode terminal arranged within the electrode support, the electrode support having a suction cavity, and each active electrode terminal having an electrode lumen therein, the electrode lumen in communication with the suction cavity. Unwanted materials may be aspirated from a surgical site via the electrode lumen.
    Type: Application
    Filed: March 12, 2004
    Publication date: November 18, 2004
    Applicant: ArthroCare Corporation
    Inventors: Robert H. Dahla, Jean Woloszko
  • Publication number: 20030097129
    Abstract: Electrosurgical methods, systems, and apparatus for the controlled ablation of tissue from a target site of a patient. An electrosurgical apparatus of the invention includes an active electrode assembly having an active electrode screen surrounded by a plurality of flow protectors. Each flow protector defines a shielded region of the active electrode screen, each shielded region of the screen characterized by enhanced plasma formation. The active electrode assembly is adapted for removing tissue from a surgical site, and the active electrode screen is adapted for digesting fragments of resected tissue. In one embodiment, the apparatus is particularly suited to simultaneously removing both hard and soft tissue in, or around, a joint.
    Type: Application
    Filed: January 21, 2003
    Publication date: May 22, 2003
    Applicant: ArthroCare Corporation
    Inventors: Terry S. Davison, Theodore C. Ormsby, Jean Woloszko, Robert H. Dahla
  • Publication number: 20030028189
    Abstract: Systems and methods are provided for applying a high frequency voltage in the presence of an electrically conductive fluid to create a relatively low-temperature plasma for ablation of tissue adjacent to, or in contact with, the plasma. In one embodiment, an electrosurgical probe or catheter is positioned adjacent the target site so that one or more active electrode(s) are brought into contact with, or close proximity to, a target tissue in the presence of electrically conductive fluid. High frequency voltage is then applied between the active electrode(s) and one or more return electrode(s) to non-thermally generate a plasma adjacent to the active electrode(s), and to volumetrically remove or ablate at least a portion of the target tissue. The high frequency voltage generates electric fields around the active electrode(s) with sufficient energy to ionize the conductive fluid adjacent to the active electrode(s).
    Type: Application
    Filed: June 27, 2002
    Publication date: February 6, 2003
    Applicant: ArthroCare Corporation
    Inventors: Jean Woloszko, Michael A. Baker, Robert H. Dahla, Hardev Kahlon, Adelina Villaruel, Cindy Truc Nguyen, Irma Gutierrez
  • Publication number: 20020099366
    Abstract: Apparatus and methods for ablating, severing, cutting, shrinking, coagulating, or otherwise modifying a target tissue to be treated. In a method for treating a target tissue, an active electrode of an electrosurgical probe is positioned in at least close proximity to the target tissue in the presence of an electrically conductive fluid. A high frequency voltage is then applied between the active electrode and a return electrode, wherein, the high frequency voltage is sufficient to volumetrically remove (ablate), sever, or modify at least a portion of the target tissue. The probe comprises a multi-lumen shaft having a plurality of internal lumens, and a return electrode coil oriented substantially parallel to the shaft distal end. The active electrode may be in the form of a metal disc, a hook, or an active electrode coil. In the latter embodiment, the active electrode coil is typically arranged substantially orthogonal to the return electrode coil.
    Type: Application
    Filed: February 5, 2002
    Publication date: July 25, 2002
    Applicant: ARTHROCARE CORPORATION, a Delaware Corporation
    Inventors: Robert H. Dahla, Jean Woloszko
  • Publication number: 20020095152
    Abstract: The present invention provides systems, apparatus, and methods for dissecting, resecting, severing, cutting, contracting, coagulating, or otherwise modifying a tissue or organ of a patient. An apparatus of the invention includes an electrosurgical probe configurable between an open configuration and a closed configuration, the probe including an active electrode terminal, a fixed return electrode disposed proximal to the active electrode terminal, and a movable return electrode configured to move linearly with respect to the active electrode terminal between the open configuration and the closed configuration. A method of the present invention comprises clamping a blood vessel between the active electrode terminal and the movable return electrode, coagulating the clamped blood vessel by application of a first high frequency voltage, and severing the coagulated blood vessel by application of a second high frequency voltage.
    Type: Application
    Filed: February 25, 2002
    Publication date: July 18, 2002
    Applicant: ArthroCare Corporation
    Inventors: Scott A. Ciarrocca, Francois Antounian, Jean Woloszko, Robert H. Dahla