Ablation apparatus having temperature and force sensing capabilities

• US 6,113,593 A
• Filed: 02/01/1999
• Issued: 09/05/2000
• Est. Priority Date: 02/01/1999
• Status: Expired due to Fees

• Current Assignee: Irvine Biomedical, Inc. (Abbott Laboratories Incorporated)
• Original Assignee: Hosheng Tu, Lily Chen Tu
• Inventors: Tu, Hosheng, Tu, Lily Chen
• Primary Examiner(s): COHEN, LEE S
• Application Number:
  US09/241,972
• Time in Patent Office: 582 Days
• Field of Search: 606/34, 606/38, 606/41, 606/49, 607/99, 607/105, 607/113, 607/122, 600/587, 600/374
• US Class Current: 606/34
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 18/1402 Probes for open surgery
• CPC Class Codes: A61B 18/1492 having a flexible, catheter-like structure, e.g. for heart ablation A61B18/1477 takes precedence
• CPC Class Codes: A61B 2018/00434 Neural system
• CPC Class Codes: A61B 2018/00666 using a threshold value
• CPC Class Codes: A61B 2018/00678 upper
• CPC Class Codes: A61B 2018/00702 Power or energy
• CPC Class Codes: A61B 2018/00708 switching the power on or off
• CPC Class Codes: A61B 2018/00791 Temperature
• CPC Class Codes: A61B 2018/00875 Resistance or impedance
• CPC Class Codes: A61B 2090/064 for measuring force, pressure or mechanical tension

Abstract

An ablation apparatus system for treating tissues in a patient, the ablation apparatus comprising temperature sensing means for measuring a temperature, wherein said temperature sensing means comprises a temperature sensing probe and at least one temperature sensing wire secured to the temperature sensing probe; force measuring means for measuring force exerted onto the temperature sensing probe by a tissue; and RF current generating means for generating RF current, wherein the RF current generating means is connected to and controlled by the temperature sensing means and force measuring means, adapted for supplying RF current to the temperature sensing probe as an electrode for tissue treatment.

Claims

1. An ablation apparatus comprising:

temperature sensing means for measuring temperature, wherein said temperature sensing means comprises a temperature sensing probe and at least one temperature sensing wire secured to the temperature sensing probe, the temperature sensing probe being adapted for tissue contact, wherein a source of RF current connects to one of the at least one temperature sensing wire of the temperature sensing means, and being adapted for delivering RF current to the temperature sensing probe; and

force measuring means for measuring force exerted onto the temperature sensing probe by contacted tissue.

2. The ablation apparatus of claim 1, wherein one of the at least one temperature sensing wire is a rigid wire for transmitting force for the force measuring means.

3. The ablation apparatus as in claim 1 further comprising temperature control means for receiving temperature reading, wherein temperature measured from the temperature sensing means is relayed to the temperature control means and is adapted to effect RF current delivery to the temperature sensing probe of the ablation apparatus.

4. The ablation apparatus as in claim 2 further comprising force control means for receiving force reading, wherein force reading measured from the force measuring means is relayed to the force control means and is adapted to effect RF current delivery to the temperature sensing probe of the ablation apparatus.

5. The ablation apparatus of claim 1, wherein RE current is within the range of 50 to 2,000 kHz.

6. The ablation apparatus of claim 1, wherein the temperature sensing probe is selected from a group consisting of a thermocouple type temperature probe, a thermistor type temperature probe, and a bimetal thermometer type temperature probe.

7. The ablation apparatus of claim 1, wherein the force measuring means is selected from a group consisting of a strain gauge, a spring instrument, a cantilever instrument, a piezoelectric transducer, piezoresistive transducer, and an elastic-element measuring device.

8. The ablation apparatus of claim 1, wherein the temperature sensing means and force measuring means are enclosed within an elongate tubular shaft for protection.

9. The ablation apparatus of claim 8, wherein the elongate tubular shaft further comprises a fluid passageway adapted for receiving fluid from a fluid source and venting fluid out of the elongate tubular shaft.

10. The ablation apparatus of claim 8, wherein a distal portion of the elongate tubular shaft is conductive and is in contact with a portion of the temperature sensing means.

11. A method for treating a tissue of a patient, the method comprising the steps of:

(a) inserting an ablation apparatus through an opening to a location of the tissue to be treated, the ablation apparatus comprising temperature sensing means for measuring temperature, wherein said temperature sensing means comprises a temperature sensing probe and at least one temperature sensing wire secured to the temperature sensing probe, the temperature sensing probe being adapted for tissue contact, wherein a source of RF current connects to one of the at least one temperature sensing wire of the temperature sensing means, and being adapted for delivering RF current to the temperature sensing probe; and

force measuring means for measuring force exerted onto the temperature sensing probe by contacted tissue;

(b) positioning the temperature sensing probe at the tissue to be treated; and

(c) applying RF current through one of the at least one temperature sensing wire to the temperature sensing probe to effect treatment of the tissue.

12. The method for treating a tissue of a patient as in claim 11, the ablation apparatus further comprising temperature control means for receiving temperature readings, the method further comprising relaying measured temperature from the temperature sensing probe to the temperature control means, adapted to effect the RF current delivery to the temperature sensing probe of the ablation apparatus.

13. The method for treating a tissue of a patient as in claim 12, wherein the tissue is selected from a group consisting of a liver tissue, a tumor, a cancer, a prostate, a canker, a capillary, a brain tissue, and a nerve tissue.

14. The method for treating a tissue of a patient as in claim 11, the ablation apparatus further comprising force control means for receiving force readings, the method further comprising relaying measured force to the force control means, adapted to effect the RF current delivery to the temperature sensing probe of the ablation apparatus.