High frequency treatment instrument

• US 20080125769A1
• Filed: 06/11/2007
• Published: 05/29/2008
• Est. Priority Date: 06/14/2006
• Status: Abandoned Application

• Current Assignee: Olympus Medical Systems Corporation (Olympus Corporation)
• Original Assignee: Olympus Medical Systems Corporation (Olympus Corporation)
• Inventors: Suzuki, Keita, Kimura, Megumi
• Application Number:
  US11/811,584
• Publication Number:
  US 20080125769A1
• Time in Patent Office: Days
• US Class Current: 606/40
• CPC Class Codes: A61B 18/14 Probes or electrodes therefor
• CPC Class Codes: A61B 18/1445 at the distal end of a shaft, e.g. forceps or scissors at the end of a rigid rod
• 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 2018/00595 Cauterization
• CPC Class Codes: A61B 2018/00875 Resistance or impedance
• CPC Class Codes: A61B 2018/1407 Loop
• CPC Class Codes: A61B 2018/141 Snare
• CPC Class Codes: A61B 2018/144 Wire

Abstract

A high frequency forceps (high frequency treatment instrument) 1 according to the present invention includes an electrical circuit which is connected via a connection cord to a high frequency power source which generates a high frequency voltage in which a pair of forceps pieces (treatment electrodes) 6A and 6B which performs conduction treatment to a target tissue by using high frequency current between a return electrode with the high frequency voltage applied from the high frequency power source, and is known as a monopolar high frequency forceps. The high frequency forceps includes an elongated flexible tube 8 in which the pair of forceps pieces 6A and 6B are arranged at distal end thereof and an impedance adjust part 11 that is connected to the electrical circuit and, based on the frequency of the high frequency power source, changes at least one of an actual number part and an imaginary number part of the impedance of the electrical circuit. According to the present invention, it is possible to provide a high frequency treatment instrument which can efficiently supply a high frequency current to a treatment electrode, and can reduce power consumption.

Claims

1. A high frequency treatment instrument comprising an electrical circuit

which

is connected to a high frequency power source which generates a high frequency voltage in which at least one treatment electrode is included for performing conduction treatment using a high frequency current to a target tissue by applying a high frequency voltage from the high frequency power source, wherein

the high frequency treatment instrument comprising:

an impedance adjust part which is connected to the electrical circuit and based on the frequency of the high frequency power source changes at least one of an actual number part and an imaginary number part of an impedance of the electrical circuit.

2. The high frequency treatment instrument according to claim 1, wherein the impedance adjust part changes the impedance of the electrical circuit when the high frequency power source and the treatment electrode are made conductive.

3. The high frequency treatment instrument according to claim 2, wherein the impedance adjust part changes the impedance of the electrical circuit when the treatment electrode contacts the target tissue.

4. The high frequency treatment instrument according to any one of claims 1 to 3, wherein the impedance adjust part includes a coil part having an inductance or a capacitor having a capacitance, and is connected is series with the electrical circuit.

5. The high frequency treatment instrument according to claim 3, wherein the impedance adjust part includes an electrical resistor, and is connected in series with the electrical circuit.

6. The high frequency treatment instrument according to claim 4, wherein the treatment electrode includes an elongated coil sheath connected to a distal end thereof;

and the coil sheath constitutes the coil part.

7. The high frequency treatment instrument according to any one of claims 1 to 3 and claims 5 to 6, wherein the treatment electrode includes a first electrode and a second electrode which create mutually different potential differences.

8. The high frequency treatment instrument according to claim 4, wherein the treatment electrode includes a first electrode and a second electrode which create mutually different potential differences.

9. A high frequency treatment instrument comprising an electrical circuit

which

is connected to a high frequency power source which generates a high frequency voltage in which at least one treatment electrode is included for performing conduction treatment using a high frequency current to a target tissue by applying a high frequency voltage from the high frequency power source, further comprising

an impedance adjust part which is connected to the electrical circuit, and is set such that the magnitude of the impedance of the electrical circuit is minimized with respect to the frequency of the high frequency power source.