Patents Assigned to Rita Medical Systems, Inc.
  • Patent number: 7160296
    Abstract: A tissue-ablation method and apparatus are disclosed. The apparatus includes a plurality of RF ablation electrodes, and a plurality of sensor elements, each movable from retracted to deployed positions in a tissue to be ablated. A control device in the apparatus is operatively connected to the electrodes for supplying an RF power to the electrodes, to produce tissue ablation that advances from individual-electrode ablation regions to fill a combined-electrode ablation volume. The control device is operatively connected to the sensor elements for determining the extent of ablation in the regions of the sensor elements. The supply of RF power to the electrodes can thus be regulated to control the level and extent of tissue ablation throughout the combined-electrode volume. The electrodes are preferably hollow-needle electrodes through which liquid can be infused into the tissue, also under the control of the control unit, to modulate and optimize tissue ablation.
    Type: Grant
    Filed: May 10, 2002
    Date of Patent: January 9, 2007
    Assignee: Rita Medical Systems, Inc.
    Inventors: Rob Pearson, Steve A. Daniel, Daniel J. Balbierz, Kee S. Lee, Jessica Liang, Martha Getaneh
  • Patent number: 7150744
    Abstract: An infusion array ablation apparatus includes an elongated delivery device having a lumen and an infusion array positionable in the lumen. The infusion array includes an RF electrode and at least a first and a second infusion member. Each infusion member has a tissue piercing distal portion and an infusion lumen. At least one of the first or second infusion members is positionable in the elongated delivery device in a compacted state and deployable from the elongated delivery device with curvature in a deployed state. Also, at least one of the first or second infusion members exhibits a changing direction of travel when advanced from the elongated delivery device to a selected tissue site. At least one infusion port is coupled to one of the elongated delivery device, the infusion array, the first infusion member or the second infusion member.
    Type: Grant
    Filed: November 3, 2003
    Date of Patent: December 19, 2006
    Assignee: Rita Medical Systems, Inc.
    Inventors: Stuart D. Edwards, James Baker, Hugh Sharkey, Ronald G. Lax
  • Patent number: 7108696
    Abstract: Ablation devices and associated methods are provided for use in palliative treatment of a bone tumor on or in a compact bone region. The bone treatment devices include an elongate probe having a distal end. A proximal end of the probe supports placement in a location at or adjacent to the bone tumor. Electrodes are carried within the probe for deployment from the distal end into the bone tumor. The electrodes may be shapable to create, upon deployment, an array of electrodes that defines a geometric area within the bone tumor. Application of energy, for example energy from a radio frequency (RF) source, to the area of the bone tumor via the electrodes destroys at least a portion of the nerve receptors located in or adjacent to the tumor and produces a reduction in pain associated with the bone tumor.
    Type: Grant
    Filed: September 22, 2003
    Date of Patent: September 19, 2006
    Assignee: Rita Medical Systems, Inc.
    Inventors: Steven A. Daniel, Daniel J. Balbierz, Robert D. Russell, Robert Pearson, Andres Tamayo, Takehito Jimbo, Karen Frischmeyer
  • Patent number: 7025765
    Abstract: A method of treating a tumor includes providing a tissue biopsy and treatment apparatus that includes an elongated delivery device that has a lumen and is maneuverable in tissue. A sensor array having a plurality of resilient members is deployable from the elongated delivery device. At least one of the plurality of resilient members is positionable in the elongated delivery device in a compacted state and deployable with curvature into tissue from the elongated delivery device in a deployed state. At least one of the plurality of resilient members includes at least one of a sensor, a tissue piercing distal end or a lumen. The sensor array has a geometric configuration adapted to volumetrically sample tissue at a tissue site to differentiate or identify tissue at the tissue site. At least one energy delivery device is coupled to one of the sensor array, at least one of the plurality of resilient members or the elongated delivery device. The apparatus is then introduced into a target tissue site.
    Type: Grant
    Filed: March 30, 2001
    Date of Patent: April 11, 2006
    Assignee: Rita Medical Systems, Inc.
    Inventors: Daniel J. Balbierz, Theodore Johnson
  • Patent number: 6962587
    Abstract: An embodiment of the invention provides a method for detecting and treating a tumor using tissue localized volumetric impedance measurement. The method includes providing an impedance measurement apparatus having a plurality of resilient members deployable with curvature and configured to sample tissue impedance through a plurality of conductive pathways. The apparatus is configured to be coupled to at least one of an energy delivery device, a power supply, a switching device or logic resources. The apparatus is then positioned at a selected tissue site and the impedance array deployed to define a sample volume. The impedance array is then utilized to make impedance measurements through a plurality of conductive pathways. Information from the impedance measurements is then utilized to determine a tissue condition of the sample volume. Energy is then delivered from the energy delivery device to ablate or necrose at least a portion of the tumor.
    Type: Grant
    Filed: July 25, 2001
    Date of Patent: November 8, 2005
    Assignee: Rita Medical Systems, Inc.
    Inventors: Theodore C. Johnson, Daniel J. Balbierz, Robert Pearson
  • Patent number: 6958062
    Abstract: A multiple antenna ablation apparatus includes an electromagnetic energy source, a trocar including a distal end, and a hollow lumen extending along a longitudinal axis of the trocar, and a multiple antenna ablation device with three or more antennas. The antennas are initially positioned in the trocar lumen as the trocar is introduced through tissue. At a selected tissue site the antennas are deployable from the trocar lumen in a lateral direction relative to the longitudinal axis. Each of the deployed antennas has an electromagnetic energy delivery surface of sufficient size to, (i) create a volumetric ablation between the deployed antennas, and (ii) the volumetric ablation is achieved without impeding out any of the deployed antennas when 5 to 200 watts of electromagnetic energy is delivered from the electromagnetic energy source to the multiple antenna ablation device. At least one cable couples the multiple antenna ablation device to the electromagnetic energy source.
    Type: Grant
    Filed: November 3, 1997
    Date of Patent: October 25, 2005
    Assignee: Rita Medical Systems, Inc.
    Inventors: Edward J. Gough, Alan A. Stein, Stuart D. Edwards
  • Patent number: 6869430
    Abstract: An embodiment of the invention provides a tissue biopsy and treatment apparatus that comprises an elongated delivery device that is positionable in tissue and includes a lumen. A sensor array having a plurality of resilient members is deployable from the elongated delivery device. At least one of the plurality of resilient members is positionable in the elongated delivery device in a compacted state and deployable with curvature into tissue from the elongated delivery device in a deployed state. At least one of the plurality of resilient members includes at least one of a sensor, a tissue piercing distal end or a lumen. The sensor array has a geometric configuration adapted to volumetrically sample tissue at a tissue site to differentiate or identify tissue at the target tissue site. At least one energy delivery device is coupled to one of the sensor array, at least one of the plurality of resilient members or the elongated delivery device.
    Type: Grant
    Filed: March 30, 2001
    Date of Patent: March 22, 2005
    Assignee: Rita Medical Systems, Inc.
    Inventors: Daniel J. Balbierz, Theodore Johnson
  • Publication number: 20040260282
    Abstract: An ablation apparatus includes an ablation energy source producing an electromagnetic energy output. A monopolar multiple antenna device is included and has a primary antenna with a longitudinal axis, a central lumen and a distal end, and a secondary antenna with a distal end. The secondary antenna is deployed from the primary antenna central lumen in a lateral direction relative to the longitudinal axis. The primary antenna and secondary antennas are each electromagnetically coupled to the electromagnetic energy source.
    Type: Application
    Filed: February 9, 2004
    Publication date: December 23, 2004
    Applicant: RITA Medical Systems, Inc.
    Inventors: Edward J. Gough, Alan A. Stein
  • Publication number: 20040181217
    Abstract: An infusion array ablation apparatus includes an elongated delivery device having a lumen and an infusion array positionable in the lumen. The infusion array includes an RF electrode and at least a first and a second infusion member. Each infusion member has a tissue piercing distal portion and an infusion lumen. At least one of the first or second infusion members is positionable in the elongated delivery device in a compacted state and deployable from the elongated delivery device with curvature in a deployed state. Also, at least one of the first or second infusion members exhibits a changing direction of travel when advanced from the elongated delivery device to a selected tissue site. At least one infusion port is coupled to one of the elongated delivery device, the infusion array, the first infusion member or the second infusion member.
    Type: Application
    Filed: November 3, 2003
    Publication date: September 16, 2004
    Applicant: RITA Medical Systems, Inc.
    Inventors: Stuart D. Edwards, James Baker, Hugh Sharkey, Ronald G. Lax
  • Publication number: 20040059328
    Abstract: Ablation devices and associated methods are provided for use in palliative treatment of a bone tumor on or in a compact bone region. The bone treatment devices include an elongate probe having a distal end. A proximal end of the probe supports placement in a location at or adjacent to the bone tumor. Electrodes are carried within the probe for deployment from the distal end into the bone tumor. The electrodes may be shapable to create, upon deployment, an array of electrodes that defines a geometric area within the bone tumor. Application of energy, for example energy from a radio frequency (RF) source, to the area of the bone tumor via the electrodes destroys at least a portion of the nerve receptors located in or adjacent to the tumor and produces a reduction in pain associated with the bone tumor.
    Type: Application
    Filed: September 22, 2003
    Publication date: March 25, 2004
    Applicant: RITA Medical Systems, Inc.
    Inventors: Steven A. Daniel, Daniel J. Balbierz, Robert D. Russell, Robert Pearson, Andres Tamayo, Takehito Jimbo, Karen Frischmeyer
  • Patent number: 6663624
    Abstract: An RF treatment apparatus includes a catheter with a catheter lumen. A removable needle electrode is positioned in the catheter lumen in a fixed relationship to the catheter. The needle electrode includes a needle lumen and a needle electrode distal end. A removable introducer is slidably positioned in the needle lumen. The introducer includes an introducer distal end. A first sensor is positioned on a surface of the needle electrode or the insulator. An RF power source is coupled to the needle electrode and a return electrode. An insulator sleeve is slidably positioned around the electrode and includes a second sensor. Resources are associated with the electrodes, sensors as well as the RF power source for maintaining a selected power at the electrode independent of changes in current or voltage.
    Type: Grant
    Filed: July 30, 1999
    Date of Patent: December 16, 2003
    Assignee: Rita Medical Systems, Inc.
    Inventors: Stuart D. Edwards, James Baker, Bruno Strul, Ronald G. Lax
  • Patent number: 6660002
    Abstract: An RF treatment apparatus includes a catheter with a catheter lumen. A removable needle electrode is positioned in the catheter lumen in a fixed relationship to the catheter. The needle electrode includes a needle lumen and a needle electrode distal end. A removable introducer is slidably positioned in the needle lumen. The introducer includes an introducer distal end. A first sensor is positioned on a surface of the needle electrode or the insulator. An RF power source is coupled to the needle electrode and a return electrode. An insulator sleeve is slidably positioned around the electrode and includes a second sensor. Resources are associated with the electrodes, sensors as well as the RF power source for maintaining a selected power at the electrode independent of changes in current or voltage.
    Type: Grant
    Filed: February 11, 2000
    Date of Patent: December 9, 2003
    Assignee: Rita Medical Systems, Inc.
    Inventors: Stuart D. Edwards, James Baker, Bruno Strul, Ronald G. Lax
  • Patent number: 6652516
    Abstract: A cell necrosis apparatus has a flexible introducer including a lumen and a distal end sufficiently sharp to penetrate tissue. An energy delivery device is positionable in the introducer as the introducer is advanced through tissue. The energy delivery device includes a first RF electrode with a tissue piercing distal portion and a second RF electrode with a tissue piercing distal portion. The first and second RF electrodes are deployable with curvature from the introducer at a selected tissue site in a lateral direction away from the periphery of the introducer.
    Type: Grant
    Filed: November 19, 1999
    Date of Patent: November 25, 2003
    Assignee: Rita Medical Systems, Inc.
    Inventor: Edward J. Gough
  • Patent number: 6641580
    Abstract: An infusion array ablation apparatus includes an elongated delivery device having a lumen and an infusion array positionable in the lumen. The infusion array includes an RF electrode and at least a first and a second infusion member. Each infusion member has a tissue piercing distal portion and an infusion lumen. At least one of the first or second infusion members is positionable in the elongated delivery device in a compacted state and deployable from the elongated delivery device with curvature in a deployed state. Also, at least one of the first or second infusion members exhibits a changing direction of travel when advanced from the elongated delivery device to a selected tissue site. At least one infusion port is coupled to one of the elongated delivery device, the infusion array, the first infusion member or the second infusion member.
    Type: Grant
    Filed: February 24, 2000
    Date of Patent: November 4, 2003
    Assignee: Rita Medical Systems, Inc.
    Inventors: Stuart D. Edwards, James Baker, Hugh Sharkey, Ronald G. Lax
  • Patent number: 6632221
    Abstract: A method of creating a lesion in tissue with infusion includes providing an apparatus comprising a first elongated delivery device with a lumen, an obturator with a second elongated delivery device and an energy delivery device positional in a lumen of the first elongated delivery device. The energy device includes at least a first and a second RF electrode each with a tissue piercing distal portion, the first and second RF electrodes being deployable from the first elongated delivery device with curvature in a deployed state. The energy delivery device includes an infusion lumen and at least one infusion port. The obturator and second delivery device are introduced to a selected tissue site. The obturator is removed from a lumen of the second delivery device and the first delivery device and energy delivery device are introduced into the lumen of the second delivery device. The first and second RF electrodes are advanced from the first delivery device to at least partially surround a target tissue site.
    Type: Grant
    Filed: February 24, 2000
    Date of Patent: October 14, 2003
    Assignee: Rita Medical Systems, Inc.
    Inventors: Stuart D. Edwards, James Baker, Hugh Sharkey, Ronald G. Lax
  • Patent number: 6632222
    Abstract: A tissue ablation apparatus comprises a first elongated delivery device including a lumen and an obturator with a tissue piercing distal end. The obturator is positionable in the lumen of the first elongated delivery device. A second elongated delivery device is positionable in the lumen of the first elongated delivery device. An energy delivery device is positionable in the second elongated delivery device. The energy delivery device includes at least a first and a second RF electrode each with a tissue piercing distal portion. The first and second RF electrodes are positionable in the second elongated delivery device in a compacted state and deployable from the second elongated delivery device with curvature in a deployed state. The first and second RF electrodes exhibit a changing direction of travel when advanced from the second elongated delivery device to a selected tissue site.
    Type: Grant
    Filed: February 24, 2000
    Date of Patent: October 14, 2003
    Assignee: Rita Medical Systems, Inc.
    Inventors: Stuart D. Edwards, James Baker, Hugh Sharkey, Ronald G. Lax
  • Patent number: 6622731
    Abstract: Ablation devices and associated methods are provided for use in palliative treatment of a bone tumor on or in a compact bone region. The bone treatment devices include an elongate probe having a distal end. A proximal end of the probe supports placement in a location at or adjacent to the bone tumor. Electrodes are carried within the probe for deployment from the distal end into the bone tumor. The electrodes may be shapable to create, upon deployment, an array of electrodes that defines a geometric area within the bone tumor. Application of energy, for example energy from a radio frequency (RF) source, to the area of the bone tumor via the electrodes destroys at least a portion of the nerve receptors located in or adjacent to the tumor and produces a reduction in pain associated with the bone tumor.
    Type: Grant
    Filed: January 11, 2002
    Date of Patent: September 23, 2003
    Assignee: Rita Medical Systems, Inc.
    Inventors: Steven A. Daniel, Daniel J. Balbierz, Robert D. Russell, Robert Pearson, Andres Tamayo, Takehito Jimbo, Karen Frischmeyer
  • Patent number: 6605085
    Abstract: An RF treatment apparatus includes a catheter with a catheter lumen. A removable needle electrode is positioned in the catheter lumen in a fixed relationship to the catheter. The needle catheter includes a needle lumen and a needle electrode distal end. A removable introducer is slidably positioned in the needle lumen. The introducer includes an introducer distal end. A first sensor is positioned on a surface of the needle electrode or the insulator. An RF power source is coupled to the needle electrode and a return electrode. An insulator sleeve is slidably positioned around the electrode and includes a second sensor. Resources are associated with the electrode, sensors as well as the RF power source for maintaining a selected power at the electrode independent of changes in current or voltage.
    Type: Grant
    Filed: December 2, 1999
    Date of Patent: August 12, 2003
    Assignee: Rita Medical Systems, Inc.
    Inventor: Stuart D. Edwards
  • Patent number: 6569159
    Abstract: A cell necrosis apparatus comprises an elongated delivery device including a lumen and an energy delivery device. The energy delivery device includes at least a first and a second RF electrode each with a tissue piercing distal portion. The first and second RF electrodes are positionable in the elongated delivery device in a compacted state and deployable from the elongated delivery device with curvature in a deployed state. The first and second RF electrodes exhibit a changing direction of travel when advanced from the elongated delivery device to a selected tissue site. At least one infusion port is coupled to one of the elongated delivery device, the energy delivery device, the first RF electrode or the second RF electrode.
    Type: Grant
    Filed: February 24, 2000
    Date of Patent: May 27, 2003
    Assignee: Rita Medical Systems, Inc.
    Inventors: Stuart D. Edwards, James Baker, Hugh Sharkey, Ronald G. Lax
  • Patent number: 6551311
    Abstract: A cell necrosis apparatus includes an introducer with a distal end sufficiently sharp to penetrate tissue, an energy delivery including a plurality of electrodes and a slidable sensing member. Each electrode of the plurality of electrodes has a tissue piercing distal end and is positionable in the introducer as the introducer is advanced through tissue. At least one electrode of the plurality of electrodes is deployable with curvature from the introducer. The slidable sensing member is positionable within the introducer and electrically coupled to the energy delivery device. The sensing member is configured to measure a property of the energy delivery device or at least one electrode of the plurality of electrodes.
    Type: Grant
    Filed: January 10, 2001
    Date of Patent: April 22, 2003
    Assignee: Rita Medical Systems, Inc.
    Inventors: Kee S. Lee, Daniel Balbierz