Apparatus for thermal treatment of tissue

• US 5,995,875 A
• Filed: 10/01/1997
• Issued: 11/30/1999
• Est. Priority Date: 10/01/1997
• Status: Expired due to Term

• Current Assignee: United States Surgical Corporation (Medtronic Plc)
• Original Assignee: United States Surgical Corporation (Medtronic Plc)
• Inventors: Stone, Corbett W., Blewett, Jeffrey J., Maurer, Christopher W.
• Primary Examiner(s): Dvorak, Linda C. M.
• Assistant Examiner(s): GIBSON, ROY DEAN
• Application Number:
  US08/942,351
• Time in Patent Office: 790 Days
• Field of Search: 607/98-102, 606/41, 606/46, 606/49, 606/50, 606/37
• US Class Current: 607/98
• CPC Class Codes: A61B 18/1477 Needle-like probes
• CPC Class Codes: A61B 2017/00867 shape memory effect for prostheses A61F2210/0014
• CPC Class Codes: A61B 2018/00517 Urinary bladder or urethra
• CPC Class Codes: A61B 2018/00547 Prostate
• CPC Class Codes: A61B 2018/00577 Ablation
• CPC Class Codes: A61B 2018/00791 Temperature
• CPC Class Codes: A61B 2018/00821 measured by a thermocouple
• CPC Class Codes: A61B 2018/0091 Handpieces of the surgical instrument or device
• CPC Class Codes: A61B 2018/00916 with means for switching or controlling the main function of the instrument or device
• CPC Class Codes: A61B 2018/1425 Needle
• CPC Class Codes: C08L 2201/12 Shape memory

Abstract

An auxiliary electromagnetic thermal treatment apparatus for use with an endoscope to provide the endoscope with electromagnetic thermal treatment capabilities includes a handle portion and an elongate portion connected to the handle portion and dimensioned to be at least partially inserted within a working channel of an endoscope. The elongate portion includes at least one delivery tube having a memory portion comprised of a shape memory material and defining a normally unstressed curved configuration. The delivery tube is longitudinally moveable relative to the handle portion to extend the memory portion beyond the working channel of the endoscope such that the memory portion assumes the normal unstressed curved configuration thereof. An electromagnetic probe is disposed within the delivery tube and is longitudinally moveable relative to the delivery tube to extend a probe end portion thereof beyond the delivery tube and within tissue. The electromagnetic probe is adapted to follow the curved configuration of the memory portion of the delivery tube for deployment at an angularly oriented relation with respect to the endoscope. A rotatable control member is mounted to the handle portion and operatively connected to the one delivery tube. The control member is rotatable to move the delivery tube between a first retracted position and a second advanced position. An actuator is also mounted to the handle portion and is operatively connected to the electromagnetic probe. The actuator is moveable to extend the probe end portion beyond the delivery tube. A combination of an endoscope and an auxiliary thermal treatment device and a method for thermally treating tissue is also provided.

Claims

1. An apparatus for thermal treatment of tissue, which comprises:

a housing portion dimensioned to be grasped with the hand of a user; and

an elongate portion connected to the housing portion and extending distally therefrom, the elongate portion dimensioned for insertion within a narrow body passage and defining a longitudinal axis, the elongate portion including;

at least one delivery catheter having proximal and distal end portions, the one delivery catheter movable relative to the housing portion and in a general longitudinal direction between a retracted position and an advanced position; and

an electromagnetic probe disposed within the one delivery catheter and moveable in a general longitudinal direction within the one delivery catheter to extend a probe end portion thereof beyond the distal end portion of the one delivery catheter and within tissue, the electromagnetic probe being adapted to follow a path defined by the distal end portion of the one delivery catheter, the electromagnetic probe being connected to a thermal energy source; and

a control member rotatably mounted to the housing portion and operatively connected to the one delivery catheter, the control member rotatably movable to selectively incrementally move the one delivery catheter in the general longitudinal direction between the retracted position and the advanced position.

2. The apparatus according to claim 1 wherein the electromagnetic probe is a monopolar electrode.

3. The apparatus according to claim 1 including a proximally positioned deployment member operatively connected to the electromagnetic probe, the actuating member moveable to deploy the probe end portion of the electromagnetic probe from the one delivery catheter.

4. The apparatus according to claim 1 wherein the elongate portion includes an outer tube, the outer tube accommodating the one delivery catheter and the electromagnetic probe.

5. The apparatus according to claim 1 wherein the control member is operatively connected to the electromagnetic probe such that movement of the control member to move the one delivery catheter between the retracted and advanced positions causes corresponding longitudinal movement of the electromagnetic probe.

6. The apparatus according to claim 1 including a thermocouple mounted to the elongate portion for detecting temperature of tissue within a treatment area generated by the electromagnetic probe.

7. The apparatus according to claim 1 including a thermocouple mounted to the elongate portion for detecting temperature of tissue adjacent a treatment area generated by the electromagnetic probe.

8. The apparatus according to claim 1 wherein the elongate portion is dimensioned for insertion within a working channel of a cystoscope.

9. An apparatus for thermal treatment of tissue, which comprises:

a housing portion dimensioned to be grasped with the hand of a user;

an elongate portion connected to the housing portion and extending distally therefrom, the elongate portion dimensioned for insertion within a narrow body passage and defining a longitudinal axis, the elongate portion including;

at least one delivery catheter having proximal and distal end portions, the one delivery catheter movable relative to the housing portion and in a general longitudinal direction between a retracted position and an advanced position, the one delivery catheter including a memory portion disposed at the distal end portion thereof, the memory portion comprised of shape memory material and having an arcuate configuration when in a normal unstressed condition thereof to define an arcuate path, the memory portion defining a generally blunt distal end surface; and

an electromagnetic probe disposed within the one delivery catheter and moveable in a general longitudinal direction within the one delivery catheter to extend a probe end portion thereof beyond the distal end portion of the one delivery catheter and within tissue, the electromagnetic probe being adapted to follow the arcuate path defined by the memory portion of the one delivery catheter, the electromagnetic probe being connected to a thermal energy source; and

a control member rotatably mounted to the housing portion and operatively connected to the one delivery catheter, the control member rotatably movable to selectively incrementally move the one delivery catheter in the general longitudinal direction between the retracted position and the advanced position.

10. A system for thermal treatment of tissue which comprises:

an endoscope including an elongate body having a working channel; and

an auxiliary thermal treatment device including;

a handle portion;

an elongate portion connected to the handle portion and extending distally therefrom, the elongate portion dimensioned to be positioned within the working channel of the endoscope and defining a longitudinal axis, the elongate portion including;

at least one delivery catheter having proximal and distal end portions, the distal end portion defining an angularly offset configuration relative to the longitudinal axis; and

an electromagnetic probe disposed within the one delivery catheter and moveable in a general longitudinal direction within the one delivery catheter to extend a probe end portion thereof beyond the distal end portion of the one delivery catheter and within tissue, the electromagnetic probe being adapted to follow the angularly offset configuration of the distal end portion of the one delivery catheter, the electromagnetic probe being connected to a thermal energy source; and

a control member mounted with respect to the housing portion and operatively connected to the one delivery catheter, the control member rotatably movable to selectively incrementally move the one delivery catheter in a longitudinal direction relative to the housing portion and within the working channel of the endoscope, to thereby selectively incrementally deploy the distal end portion of the one delivery catheter from the working channel such that the distal end portion assumes the angularly offset configuration thereof; and

a deployment member mounted to the handle portion and operatively connected to the electromagnetic probe assembly, the deployment member moveable to deploy the probe end portion of the electromagnetic probe assembly.

11. A system for thermal treatment of tissue, which comprises:

an endoscope including an elongate body having a working channel; and

an auxiliary thermal treatment device including;

a handle portion;

an elongate portion connected to the handle portion and extending distally therefrom, the elongate portion dimensioned to be positioned within the working channel of the endoscope and defining a longitudinal axis, the elongate portion including;

at least one delivery catheter having proximal and distal end portions, the distal end portion having a memory portion comprised of shape memory material and defining an arcuate configuration angularly offset relative to the longitudinal axis when in a normal unstressed condition thereof;

an electromagnetic probe disposed within the one delivery catheter and moveable in a general longitudinal direction within the one delivery catheter to extend a probe end portion thereof beyond the distal end portion of the one delivery catheter and within tissue, the electromagnetic probe being adapted to follow the arcuate configuration of the memory portion of the one delivery catheter, the electromagnetic probe being connected to a thermal energy source; and

a control member mounted with respect to the housing portion and operatively connected to the one delivery catheter, the control member rotatably movable to selectively incrementally move the one delivery catheter in a longitudinal direction relative to the housing portion and within the working channel of the endoscope, to thereby selectively incrementally deploy the distal end portion of the one delivery catheter from the working channel such that the memory portion assumes the normal unstressed curved configuration thereof; and

a deployment member mounted to the handle portion and operatively connected to the electromagnetic probe assembly, the deployment member moveable to deploy the probe end portion of the electromagnetic probe assembly.

12. The system according to claim 11 wherein the electromagnetic probe is configured as a monopolar RF electrode.

13. The system according to claim 11 wherein the working channel of the elongate body of the endoscope includes an axial bore extending through a distal end face of the elongate body.

14. The combination of claim 13 wherein the elongate portion of the thermal treatment device includes an axial bore extending through a distal end face of the elongate portion, the one delivery catheter and the electromagnetic probe being deployed through the distal end face of the elongate portion.

15. The system according to claim 13 wherein the electromagnetic probe defines a hollow passageway, the passageway defining a channel for passage of a dissipating agent.

16. The system according to claim 11 wherein the elongate portion is operatively connected to a source of dissipating agent for facilitating dissipation of thermal energy within the tissue and wherein the dissipating agent is conveyed through a channel extending through the elongate portion.

17. The system according to claim 11 wherein the endoscope includes an optical system for viewing an image of an object.

18. The system according to claim 11 wherein the endoscope includes an illumination system for providing illuminating light.

19. An auxiliary electromagnetic thermal treatment apparatus for use with an endoscope to provide the endoscope with electromagnetic thermal treatment capabilities, which comprises:

a handle portion;

an elongate portion connected to the handle portion and extending distally therefrom, the elongate portion dimensioned to be at least partially inserted within a working channel of an endoscope, the elongate portion including;

at least one delivery tube including a memory portion comprised of a shape memory material and defining a normally unstressed curved configuration, the one delivery tube longitudinally moveable relative to the handle portion to extend the memory portion beyond the working channel of the endoscope such that the memory portion assumes the normal unstressed curved configuration thereof; and

an electromagnetic probe disposed within the one delivery tube and longitudinally moveable relative to the one delivery tube to extend a probe end portion thereof beyond the one delivery tube and within tissue, the electromagnetic probe being adapted to follow the curved configuration of the memory portion of the one delivery tube in the normal unstressed condition thereof; and

an actuating member rotatably mounted to the handle portion and operatively connected to the delivery tube, the actuating member moveable to selectively longitudinally move the delivery tube between a first retracted position and a second advanced position.

20. The auxiliary apparatus according to claim 19 including an actuator mounted to the handle portion and operatively connected to the electromagnetic probe, the actuator moveable to extend the probe end portion beyond the one delivery tube.

21. The auxiliary apparatus according to claim 20 wherein the elongate portion includes a flexible outer sleeve, the one delivery tube being at least partially disposed within the outer sleeve.

22. The auxiliary apparatus according to claim 19 wherein the probe is configured as a monopolar electrode.

23. A method for thermally treating tissue, comprising the steps of:

accessing targeted tissue to be thermally treated with an endoscope;

inserting an auxiliary thermal treatment apparatus at least partially into a working channel of the endoscope, the thermal treatment apparatus including an elongate body dimensioned for insertion into the working channel, at least one delivery tube having a memory portion comprised of a shape memory material, an electromagnetic probe disposed within the one delivery tube and a rotatable control member operatively connected to the one delivery tube;

selectively advancing the one delivery tube through the elongate body by rotating the rotatable control member to extend the memory portion of the one delivery tube beyond the elongate body and beyond the working channel of the endoscope, whereby the memory portion assumes a normal curved unstressed orientation;

advancing the electromagnetic probe within the one delivery tube to extend the distal end portion of the electromagnetic probe beyond the one delivery tube and into the targeted tissue, whereby the electromagnetic probe follows the path defined by the one delivery tube in the normal curved orientation thereof; and

supplying electromagnetic energy to the electromagnetic probe to thermally treat the tissue.

24. The method of claim 23 wherein the step of advancing the electromagnetic probe includes activating a proximally positioned actuator connected to the electromagnetic probe to selectively advance the electromagnetic probe.

25. The method of claim 24 wherein the step of accessing includes positioning the endoscope within a urethral passage and wherein the step of advancing includes introducing the distal end position of the electromagnetic probe within prostatic tissue.