TUNA device with integrated saline reservoir

• US 7,322,974 B2
• Filed: 08/10/2004
• Issued: 01/29/2008
• Est. Priority Date: 08/10/2004
• Status: Active Grant

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Woessner, Julie M., Swoyer, John M., Christopherson, Mark A., Tropsha, Yelena G.
• Primary Examiner(s): Gibson; Roy D.
• Assistant Examiner(s): VRETTAKOS, PETER J
• Application Number:
  US10/915,310
• Publication Number:
  US 20060036235A1
• Time in Patent Office: 1,267 Days
• Field of Search: 606/41, 606 27- 52
• US Class Current: 606/41
• CPC Class Codes: A61B 18/1477 Needle-like probes
• CPC Class Codes: A61B 2018/1472 for use with liquid electrolyte, e.g. virtual electrodes
• CPC Class Codes: A61B 2018/1475 Electrodes retractable in or deployable from a housing

Abstract

Methods and apparatus for ablating a target tissue are discussed. Such methods and apparatus include those that simplify tissue ablation. For example, a tissue ablation device having an actuator, such as a trigger mechanism, coupled to a power source and an electrode is discussed. A single step of engaging the actuator causes the electrode to be introduced into the target tissue and causes energy to be delivered from the power supply to the tissue via the electrode. By way of additional example, a tissue ablation device having an actuator coupled to a fluid source and an electrode is discussed. A single step of engaging the actuator causes conductive fluid to flow from the fluid source to the target tissue location and causes the electrode to be introduced to the target tissue location. The fluid source may be a conductive fluid, such as saline, which may increase the efficiency of ablation. Various other configurations and methods that simplify tissue ablation are also discussed.

Claims

1. A device for ablating a tissue at a target location, comprising:

a housing;

an elongate probe member

extending from the housing,

having proximal and distal ends, and

being provided with a first passageway extending at least substantially from the proximal end to the distal end;

a first ablation needle

having proximal and distal ends and a lumen extending at least substantially from the proximal end to the distal end, and

being slidably disposed within the first passageways of the elongate probe member;

a reservoir

capable of holding a conductive fluid, and

being in fluid communication with one or both of the lumen of the first needle or the first passageway of the elongate probe member; and

an actuator

coupled to the reservoir and configured to cause the conductive fluid to flow through one or both of the lumen of the first needle or the first passageway of the elongate tubular member into the target location, and

coupled to the proximal end of the first needle and configured to cause the distal end of the first needle to extend into the target location.

2. The device of claim 1, wherein the actuator comprises a lever.

3. The device of claim 2, wherein the lever extends from the housing.

4. The device of claim 3, wherein the lever is a trigger capable of being engaged by a human hand.

5. The device of claim 1, wherein the reservoir is in fluid communication with the lumen of the first needle.

6. The device of claim 1, further comprising

a second passageway extending at least substantially from the proximal end to the distal end of the elongate probe member, and

a second ablation needle slidably disposed in the second passageway, the second needle comprising proximal and distal ends.

7. The device of claim 6, wherein the actuator is coupled to the proximal end of the second needle and configured to cause the distal end of the first needle to extend into the target location.

8. The device of claim 7, wherein the second needle comprises a lumen.

9. The device of claim 8, wherein the reservoir is in fluid communication with the lumen of the second needle.

10. The device of claim 6, further comprising tubing, the tubing comprising a first end operably coupled to the reservoir and a second end operably coupled to the first needle such that the reservoir and the lumen of the first needle are in fluid communication.

11. The device of claim 6, further comprising tubing,

the tubing comprising a proximal end and first and second distal ends,

the proximal end of the tubing being operably connected to the reservoir,

the first distal end of the tubing being connected to the first needle such that such that the reservoir and the lumen of the first needle are in fluid communication,

the second distal end of the tubing being connected to the second needle such that such that the reservoir and the lumen of the second needle are in fluid communication.

12. A system for ablating a tissue at a target location, comprising:

the device of claim 1; and

an energy source for ablating the tissue operably coupled to the first ablation needle.

13. A device for ablating a tissue at a target location, comprising:

a housing;

an elongate probe member

extending from the housing,

having proximal and distal ends, and

being provided with a first passageway extending at least substantially from the proximal end to the distal end;

a first ablation needle

having proximal and distal ends and a lumen extending at least substantially from the proximal end to the distal end, and

being slidably disposed within the first passageways of the elongate probe member;

a reservoir

capable of holding a conductive fluid, and

being in fluid communication with one or both of the lumen of the first needle or the first passageway of the elongate probe member; and

an actuator

coupled to the reservoir and configured to cause the conductive fluid to flow through one or both of the lumen of the first needle or the first passageway of the elongate tubular member into the target location, and

coupled to the proximal end of the first needle and configured to cause the distal end of the first needle to extend into the target location; and

a discharge member,

the discharge member comprising proximal and distal portions,

the proximal portion of the discharge member being in fluid communication with the reservoir,

the distal portion of the discharge member being in fluid communication with one or both of the lumen of the first needle or the first passageway of the elongate probe member.

the discharge member being coupled to the actuator such that engaging the actuator forces the conductive fluid to flow from the discharge member to the target location through one or both of the lumen of the first needle or the first passageway of the elongate probe member.

14. The device of claim 13, wherein the discharge member is coupled to the actuator such that disengaging the actuator reduces pressure in the discharge member relative to the reservoir, allowing the conductive fluid from the reservoir to be drawn into the discharge member.

15. The device of claim 14, further comprising first and second valves,

the first valve and second valves comprising proximal and distal ends,

the proximal end of the first valve being in fluid communication with the reservoir and the distal end of the first valve being in fluid communication with the discharge member,

the proximal end of the second valve being in fluid communication with the discharge member and the distal end of the second valve being in fluid communication with one or both of the lumen of the first needle or the first passageway of the elongate probe member,

wherein the first valve allows the conductive fluid to flow from the reservoir to the discharge member but prevents flow from the discharge member to the reservoir, and

wherein the second valve allows the conductive fluid to flow from the discharge member to one or both of the lumen of the first needle or the first passageway of the elongate probe member but prevents flow from one or both of the lumen of the first needle or the first passageway of the elongate probe member to the discharge member.