Apparatus and device for use therein and method for ablation of tissue

• US 6,102,907 A
• Filed: 08/15/1997
• Issued: 08/15/2000
• Est. Priority Date: 08/15/1997
• Status: Expired due to Fees

• Current Assignee: Somnus Medical Technologies, Inc. (Olympus Corporation)
• Original Assignee: Somnus Medical Technologies, Inc. (Olympus Corporation)
• Inventors: Muller, Peter H., Filice, James A., Kamdar, Kirti P., Smethers, Rick T.
• Primary Examiner(s): Dvorak, Linda C. M.
• Assistant Examiner(s): GIBSON, ROY DEAN
• Application Number:
  US08/912,273
• Time in Patent Office: 1,096 Days
• Field of Search: 606/40-42, 606/45-52, 604/192, 604/263
• US Class Current: 606/40
• CPC Class Codes: A61B 18/1477 Needle-like probes
• CPC Class Codes: A61B 2018/00755 Resistance or impedance
• CPC Class Codes: A61B 2018/00821 measured by a thermocouple
• CPC Class Codes: A61B 2018/00875 Resistance or impedance
• CPC Class Codes: A61B 2018/1253 monopolar
• CPC Class Codes: A61B 2018/1475 Electrodes retractable in or deployable from a housing

Abstract

A device for the ablation of tissue for use with the human hand and a radio frequency power supply and controller providing a source of radio frequency energy and a control for controlling the application of radio frequency energy to the device. The device includes a handle sized so that is adapted to be grasped by the human hand and has proximal and distal extremities. A needle formed of a conducting material has proximal and distal extremities. The proximal extremity of the needle is mounted on the distal extremity of the handle so that it is insulated from the handle. Conductors are carried by the handle and are connected to the needle and extend from the handle and are coupled to the radio frequency power supply and controller for supplying radio frequency energy to the needle. A temperature sensor is carried by the handle and is adapted to be coupled to the radio frequency power supply and controller for sensing the application of radio frequency energy to the tissue for controlling the application of radio frequency energy to the needle.

Claims

1. A device for the ablation of tissue for use with the fingers of a human hand and a radio frequency power supply and controller providing a source of radio frequency energy and means for controlling the application of radio frequency energy to the device comprising a one-piece unitary handle having an exterior surface sized so that it is adapted to be grasped and supported by two fingers of the human hand and having proximal and distal extremities, a single conductive needle formed of a conducting material and having proximal and distal extremities, means for mounting the proximal extremity of the needle in a molded static position on the distal extremity of the handle so that it is the sole needle carried by the handle and is insulated from the handle and having a portion that extends distally of the handle, conductive means including a printed circuit board carried by the handle and connected to the needle and extending from the handle and adapted to be coupled to the radio frequency power supply and controller for supplying radio frequency energy to the needle and control means carried by the handle and adapted to be coupled to the radio frequency power supply and controller for sensing the application of radio frequency energy to the tissue for controlling the application of radio frequency energy to the needle, said control means being free of controls on the exterior surface of the handle.

2. A device as in claim 1 wherein said means for sensing the application of radio frequency energy to the tissue includes at least one thermocouple and conductors connected to said at least one thermocouple and adapted to be coupled to the radio frequency power supply and controller.

3. A device as in claim 2 wherein said means for sensing the application of radio frequency energy to the tissue includes an additional thermocouple and conductive means adapted to couple the additional thermocouple to the radio frequency power supply and controller.

4. A device as in claim 3 wherein the additional thermocouple is mounted in the distal extremity of the needle.

5. A device as in claim 2 wherein the proximal portion of the needle is inclosed within an insulating sleeve and wherein the at least one thermocouple is disposed in the insulating sleeve adjacent the needle.

6. A device as in claim 1 further including a removable protective sleeve extending over the needle.

7. A device as in claim 6 wherein the protective sleeve is threaded over the needle.

8. A device as in claim 1 wherein the needle is formed of a malleable material to permit bending of the needle to match the anatomy of the tissue to be treated.

9. A device as in claim 1 wherein said handle is in the form of a cylindrical body having a conical distal extremity, said cylindrical body having a plurality of longitudinally spaced-apart annular grooves formed therein proximal to the conical distal extremity to facilitate grasping of the handle by the fingers of the hand.

10. A device for the ablation of tissue for use with the human hand and a radio frequency power supply and controller providing a source of radio frequency energy and means for controlling the application of radio frequency energy to the device comprising a handle having an exterior surface with a width and sized so that is adapted to be grasped by the human hand and having proximal and distal extremities, a needle formed of a conducting material and having proximal and distal extremities, means for mounting the proximal extremity of the needle on the distal extremity of the handle so that it is insulated from the handle, conductive means carried by the handle and connected to the needle and extending from the handle and adapted to be coupled to the radio frequency power supply and controller for supplying radio frequency energy to the needle, control means carried by the handle and adapted to be coupled to the radio frequency power supply and controller for sensing the application of radio frequency energy to the tissue for controlling the application of radio frequency energy to the needle, said control means being free of controls on the exterior surface of the handle, said needle being slidably mounted in the handle for movement from an extended position to a retracted position in which the needle is enclosed within the handle and in the extended position has the distal extremity of the needle free of the handle, a single slider slidably mounted in the handle and secured to the proximal extremity of the needle, a knob having a generally circular recess therein adapted to receive a finger of the hand for resting within the recess and being mounted on the exterior of the handle, said knob extending substantially across the width of the handle, and means secured to the knob extending into the handle and engaging the slider whereby as the knob is advanced and retracted longitudinally of the handle, the needle is advanced from the handle and retracted into the handle.

11. A device as in claim 10 wherein said conductive means includes a connector assembly mounted in the handle and having first and second mating parts, said handle being separable into first and second parts with one mating part disposed in one part of the handle and the other mating part being disposed in the other part of the handle and wherein the means carried by the handle and adapted to be coupled to the radio frequency power supply and controller includes a cable secured to one of the first and second mating parts provided in the first part of the handle and in which the first part is reusable.

12. A device as in claim 11 wherein said conductive means carried by the handle and connected to the needle includes a printed circuit board mounted within the handle.

13. A method for the ablation of tissue in an anatomical feature, the anatomical feature being thin in cross section and having a mucosal layer overlying the tissue by the use of a device and a radio frequency power supply, the device comprising a handle having an exterior surface sized so as to be adapted to be grasped by and supported by two fingers of the human hand and having proximal and distal extremities and a needle formed of a conductive material and having proximal and distal extremities, means for mounting the proximal extremity of the needle on the distal extremity of the handle and control means carried by the handle and free of external controls on the exterior surface of the handle and adapted to be coupled to the radio frequency power supply for controlling the application of radio frequency power to the needle for the ablation of tissue, the method comprising supplying a needle having a conformation matching the anatomy of the tissue to be treated, inserting the needle through the mucosal layer into the tissue by the use of two fingers grasping the handle while viewing over the exterior surface of the handle the insertion of the needle into the mucosal layer so that the insulating layer carried by the needle extends beyond the mucosal layer and into tissue, supplying radio frequency energy to the needle at a low wattage ranging from 1 to 5 watts for a period of time ranging from 20 seconds to 5 minutes to cause ablation of the tissue and to preserve the tissue in the anatomical feature that is thin in cross-section, sensing the temperature of the tissue in the vicinity of the distal extremity of the needle, automatically terminating the delivery of radio frequency energy to the needle when a predetermined temperature has been reached in the tissue in the vicinity of the needle and thereafter withdrawing the needle from the tissue to avoid thermal damage to the mucosal layer.