Electrical cautery device

• US 8,202,269 B2
• Filed: 05/25/2007
• Issued: 06/19/2012
• Est. Priority Date: 05/25/2007
• Status: Expired due to Fees

• Current Assignee: Board of Regents of the University of Michigan (University of Michigan)
• Original Assignee: Board of Regents of the University of Michigan (University of Michigan)
• Inventors: Yoder, Brian M., Huddleston, Matthew J., Landis, Adam, Wolf, J. Stuart Jr.
• Primary Examiner(s): Dvorak, Linda
• Assistant Examiner(s): DELLA, JAYMI E
• Application Number:
  US11/807,312
• Publication Number:
  US 20080294161A1
• Time in Patent Office: 1,852 Days
• Field of Search: 606/41, 606/45, 606/49, 606 27- 31
• US Class Current: 606/28
• CPC Class Codes: A61B 18/082 Probes or electrodes therefor
• CPC Class Codes: A61B 2017/00084 Temperature

Abstract

An electrical surgical cautery device for delivering thermal energy to cauterize and provide hemostasis to a bleeding tissue comprises an electrically powered flexible thermal delivery element having a substantially planar resistive coil embedded in a thermally conductive material. The thermally conductive material comprises a tissue contact surface and a non-tissue contact surface. A power source is connected to the resistive coil of the thermal delivery element and provides an electrical current to heat the thermal delivery element being pressed against the tissue. A method for providing hemostasis to a bleeding tissue surface comprises providing and pressing an electrical cautery device having a thermal delivery element, against the hemorrhaging tissue at a predetermined temperature for an interval sufficient to cauterize the tissue and provide hemostasis.

Claims

1. An apparatus for delivering thermal energy to tissue, the apparatus comprising:

an electrically powered thermal delivery element configured to be flexible and having a substantially planar resistive coil embedded in a thermally conductive material, wherein the electrically powered thermal delivery element has a tissue contact surface and an opposed non-tissue contact surface, said tissue contact surface operable to directly heat a surface of tissue being contacted by thermal transfer from said substantially planar resistive coil embedded in said thermally conductive material, said thermal delivery element having a maximum watt density of about 5 to about 70 Watts per square inch sufficient to heat said tissue contact surface to a set predetermined temperature, and

a power generating means connected to said resistive coil of said thermal delivery element generating an electrical current through said thermal delivery element during a thermal application interval having sufficient energy to heat the tissue contact surface of said thermal delivery element to said set predetermined temperature to cauterize said tissue during said application interval;

wherein the electrically powered thermal delivery element is configured to be flexible by including at least one slit to allow a first portion of the electrically powered thermal delivery element to fold relative to a second portion of the electrically powered thermal delivery element.

2. The apparatus of claim 1, wherein the planar resistive coil has an effective resistance ranging from 50 to 500 ohms/in² sufficient to heat said thermal delivery element to heat said tissue to the predetermined temperature within the thermal application period.

3. The apparatus of claim 1, further comprising a controller means operably connected to said power generating means to control the output of electrical power from said power generating means to said thermal delivery element comprising a voltage regulator and a temperature controller.

4. The apparatus of claim 1, further comprising a temperature measuring means connected to said non-tissue contact surface of said thermal delivery element and to said controller means for providing an electrical indication of the temperature of said thermal delivery element.

5. The apparatus of claim 1, further comprising an applicator instrument comprising:

a generally cylindrical shell having a first end and a second end, said shell comprises a cavity containing an electrical conductor operable to transmit electrical power from said power generating means to said thermal delivery element, a temperature measuring means connected to said thermal delivery element and a controller means,

a flexible cable operably connected to said first end of said applicator instrument comprising said electrical conductor in connection with said power generating means and extends through said cavity of the cable and cylindrical shell and is connected to said thermal delivery element, and

a connecting means for connecting said thermal delivery element to the second end of said applicator instrument.

6. The apparatus of claim 5, wherein the temperature measuring means is a thermocouple.

7. The apparatus of claim 5, wherein the applicator instrument is electrically grounded.

8. The apparatus of claim 5, further comprising collapsible arms attached to said thermal delivery element and said applicator instrument, said arms operable to collapse when said thermal delivery element is pressed against a tissue.

9. The apparatus of claim 1, wherein the thermally conductive material comprises a low-tissue-adhesion and bio-inert polymeric material.

10. The apparatus of claim 9, wherein the bio-inert polymeric material comprises any one or more of polytetrafluoroethylene, a derivative of polytetrafluoroethylene, a variant of polytetrafluoroethylene, polyimide, polyvinyl fluoride, polyvinylidene fluoride, perfluoroalkoxy tetrafluoroethylene, polychloro trifluoroethylene and silicone elastomer.

11. A surgical cauterizing device comprising:

a power generating means providing a source of current or voltage;

an applicator instrument having a first end and a second end, wherein said first end is in electrical communication with said power source;

an electrical lead disposed within said applicator instrument;

a deformable bio-inert heating element operably connected with said second end of said applicator instrument, said heating element having an electrically resistive planar foil encapsulated within a thermally conductive encapsulation material to generate heat to cauterize tissue;

a thermocouple connected to the deformable bio-inert heating element configured to send a signal based on a temperature of the deformable bio-inert heating element to assist in controlling the power generating means; and

an instrument defining a lumen;

wherein said applicator instrument is operable to be moved within said lumen;

wherein said deformable bio-inert heating element includes a plurality of leaves configured to be folded relative to one another within said lumen.

12. The surgical cauterizing device according to claim 11, further comprising a controller means operably connected to said power source for regulating electrical current.

13. The surgical cauterizing device according to claim 11, wherein the thermocouple is operably connected to said heating element and in electrical communication with said controller means.

14. The surgical cauterizing device according to claim 11, wherein the encapsulation material comprises polyimide.

15. The surgical cauterizing device according to claim 11, wherein the encapsulation material comprises any one or more of polyfluorotetra-ethylene, fluoro-ethylene propylene, polyvinyl fluoride, polyvinylidene fluoride, perfluoroalkoxy tetrafluoroethylene, polychloro trifluoroethylene, and silicone elastomer.

16. The surgical cauterizing device according to claim 15, wherein the encapsulation material includes fluoro-ethylene-propylene and polyimide.

17. The surgical cauterizing device according to claim 11, wherein said planar foil comprises a resistive material having an effective resistance ranging from 50 to 500 ohms/in².

18. The surgical cauterizing device according to claim 11, wherein said planar foil has a maximum watt density of about 5 to about 70 Watts per square inch sufficient to heat said tissue contact surface to a set predetermined temperature.