Cool-tip combined electrode introducer

• US 8,377,057 B2
• Filed: 07/20/2010
• Issued: 02/19/2013
• Est. Priority Date: 10/08/2004
• Status: Active Grant

• Current Assignee: Covidien AG (Medtronic Plc)
• Original Assignee: Covidien AG (Medtronic Plc)
• Inventors: Rick, Kyle R., Heard, David N., Buysse, Steven P.
• Primary Examiner(s): Cohen, Lee S
• Application Number:
  US12/839,849
• Publication Number:
  US 20100292686A1
• Time in Patent Office: 945 Days
• Field of Search: 606/41
• US Class Current: 606/41
• CPC Class Codes: A61B 18/1477 Needle-like probes
• CPC Class Codes: A61B 2018/0016 Energy applicators arranged in a two- or three dimensional array
• CPC Class Codes: A61B 2018/143 multiple needles

Abstract

The present disclosure relates to systems, devices and methods for positioning and placing multiple electrodes in a target surgical site. An introducer is provided for facilitating the insertion of a cluster of electrodes into the body of a patient for performing tissue ablation. The introducer includes a body portion including a plurality of holes formed therein for selectively receiving a respective elongated shaft of the electrodes therethrough, wherein the holes of the introducer orient and space each electrode relative to one another, wherein the introducer includes a centrally disposed hole formed therein for receiving a guide needle therethrough.

Claims

1. An electrode system for use with a high frequency generator to induce coherent high frequency heat ablation volumes within targeted tissue of a patient, the electrode system comprising:

at least three electrodes, each including;

a substantially rigid elongated shaft terminating in a sealed distal end section having an exposed conductive tip portion configured to be inserted into the targeted tissue and adapted at a proximal end section to be coupled to a high frequency generator to simultaneously apply an equal output voltage to each of the exposed conductive tip portions; and

a closed-loop fluid communication channel pathway which includes an inflow opening adapted for connection to a coolant fluid supply, and a channel portion in fluid communication with the inflow opening, which extends distally inside the conductive tip portion to carry coolant to the inside of the conductive tip portion and further extends proximally back to an outlet opening adapted to carry coolant away from the conductive tip portion;

an introducer including a plurality of holes defined therein configured to selectively receive a respective elongated shaft of each electrode therethrough, wherein the plurality of holes orient and space each electrode relative to one another; and

a guide needle disposed at the center of the introducer.

2. The electrode system according to claim 1, wherein the plurality of holes includes a central hole configured to receive the guide needle therethrough.

3. The electrode system according to claim 1, wherein the introducer includes a distal introducer and a proximal introducer, wherein the distal and proximal introducers each include a plurality of holes defined therein including a central hole configured to selectively receive the guide needle therethrough.

4. The electrode system according to claim 3, wherein the proximal introducer is movable relative to the distal introducer and is configured to maintain the electrodes therein during movement to insert the electrodes into tissue.

5. The electrode system according to claim 2, wherein the plurality of holes includes six arrays of holes and each array is arranged in a linear row.

6. The electrode system according to claim 5, wherein the linear rows of holes alternate between rows of six holes and rows of seven holes.

7. The electrode system according to claim 2, wherein the plurality of holes are equally spaced from one another.

8. The electrode system according to claim 2, wherein the plurality of holes includes a plurality of arrays of hole clusters, wherein each array of hole clusters is arranged in a linear row, wherein the rows of hole clusters are equally spaced from one another.

9. The electrode system according to claim 8, wherein each hole cluster includes a radially inner-most hole and a pair of radially outer-most holes, wherein the radially outer-most holes are offset by an angle from an axis extending through the inner-most holes of each respective array of hole clusters.

10. The electrode system according to claim 9, wherein the inner-most holes of each linear row of hole clusters are equally spaced from one another.

11. A method for heat ablation of tissue in a patient, the method comprising:

providing an electrode system for inducing enlargement of heat ablation volumes within tissue of a patient'"'"'s body, the electrode system including;

a high frequency generator for supplying an output voltage;

at least three substantially rigid, elongated electrodes adapted to be inserted into the tissue of a patient'"'"'s body, each of the at least three electrodes including an exposed conductive tip portion and a closed-loop fluid communication channel pathway, which includes an inflow opening adapted for connection to a coolant fluid supply and a channel portion in fluid communication with the inflow opening, the channel portion extending distally inside the conductive tip portion to carry coolant to the inside of the conductive tip portion and further extending proximally back to an outlet opening adapted to carry coolant away from the conductive tip portion, wherein the exposed conductive tip portions of the at least three electrodes are arranged in a predetermined parallel relationship with each other; and

an introducer including a plurality of holes defined therein configured to selectively receive a respective elongated shaft of each electrode therethrough, wherein the plurality of holes orient and space each electrode relative to one another, wherein the introducer includes a central hole defined therein configured to receive a guide needle therethrough;

advancing a guide needle through the central hole of the introducer;

inserting the electrodes into desired holes of the introducer to position each electrode relative to one another;

inserting the electrodes into tissue;

applying substantially the same radio frequency output through the electrodes to a targeted tissue volume to produce coherent heating of the targeted tissue volume;

raising the radio frequency output to a level that induces enlargement of the volume of heat ablation in tissue near the electrodes; and

cooling each electrode by circulating a cooling fluid through the closed-loop fluid communication channel pathway formed in each of the electrodes.

12. The method according to claim 11, further comprising:

inserting the guide needle into the patient'"'"'s body such that a tip of the guide needle is placed in close proximity to a targeted tissue.

13. The method according to claim 12, further comprising:

withdrawing the guide needle from the introducer, wherein the guide needle is advanced through the central hole of the introducer prior to withdrawing the guide needle from the introducer.

14. An introducer for facilitating insertion of a cluster of electrodes into the body of a patient for performing tissue ablation, the introducer comprising:

a body portion including a plurality of holes defined therein configured to selectively receive a respective elongated shaft of the electrodes therethrough, wherein the plurality of holes of the body portion are configured to orient and space each electrode relative to one another; and

a guide needle disposed at the center of the body portion,

wherein the plurality of holes includes a central hole configured to receive the guide needle,

wherein the body portion includes;

a distal body portion including a plurality of arrays of holes defined therein, wherein each array of holes is arranged in a linear row, wherein the rows of holes are equally spaced from one another; and

a proximal body portion including a plurality of arrays of holes defined therein, wherein each array of holes is arranged in a linear row, wherein the rows of holes are equally spaced from one another, and

wherein the proximal body portion is movable relative to the distal body portion to insert the electrodes into tissue.

15. The introducer according to claim 14,

wherein the proximal body portion includes six arrays of holes formed therein,

wherein the holes of each linear row of holes of the proximal body portion are equally spaced from one another, and

wherein the rows of holes of the proximal body portion alternate between rows of six holes and rows of seven holes.

16. The introducer according to claim 15, wherein each array of holes of the distal body portion includes a radially inner-most hole and a pair of radially outer-most holes, wherein the radially outer-most holes are offset by an angle from an axis extending through the inner-most holes of each respective array of holes.