Electrosurgery apparatus and medical apparatus combined with the same

• US 5,931,836 A
• Filed: 07/21/1997
• Issued: 08/03/1999
• Est. Priority Date: 07/29/1996
• Status: Expired due to Term

• Current Assignee: Olympus Optical Company Ltd. (Olympus Corporation)
• Original Assignee: Olympus Optical Company Ltd. (Olympus Corporation)
• Inventors: Gotanda, Masakazu, Matsumoto, Hiroaki, Oyama, Masahide, Sakurai, Tomohisa, Hijii, Kazuya, Ogawa, Akihisa, Hatta, Shinji, Tanaka, Kazue, Mihori, Takashi, Ichikawa, Yoshito
• Primary Examiner(s): Buiz, Michael
• Assistant Examiner(s): Woo, Julian W.
• Application Number:
  US08/896,734
• Time in Patent Office: 743 Days
• Field of Search: 606/41-46, 606/32-39
• US Class Current: 606/38
• CPC Class Codes: A61B 18/1206 Generators therefor
• CPC Class Codes: A61B 2018/00702 Power or energy
• CPC Class Codes: A61B 2018/00755 Resistance or impedance
• CPC Class Codes: A61B 2018/00869 Phase
• CPC Class Codes: A61B 2018/00875 Resistance or impedance

Abstract

In an electrosurgery apparatus for treating a living tissue, while the living tissue is being treated, a variation in state of energy supplied from a cautery power supply to a monopolar treatment device is detected on the basis of detection data obtained from a current sensor and a voltage sensor. Based on the detected variation, living body information on the living tissue to be treated is obtained.

Claims

1. An electrosurgery apparatus including an electric scalpel having a treatment section for treating a living tissue, and an energy supply for supplying treatment energy to the treatment section, wherein the living tissue is treated by the treatment section while the treatment energy is being supplied to the treatment section,

the apparatus further comprising:

variation detection means for detecting a variation in condition of the energy supplied to the treatment section while the living tissue is being treated, said variation detection means including means for measuring an impedance in the living tissue while an output is being delivered from the electric scalpel, and detection means for detecting a variation range of the measured impedance; and

living body information detection means for acquiring living body information on the living tissue to be treated, on the basis of detection data obtained by said variation detection means, said living body information detection means including output control means for effecting one of stopping and reducing of the output of the electric scalpel, while the output is being supplied, when the detection means detects the variation range of the measured impedance per unit time which is greater than the variation range of the impedance per unit time which is measured in a predetermined time period lust after the treatment section starts to treat the living tissue.

4. The apparatus according to claim 1, wherein said energy supply comprises:

a plurality of high-frequency oscillation sources for outputting high-frequency outputs with different oscillation frequencies to the electric scalpel; and

a mixing circuit for mixing the high-frequency outputs with the different oscillation frequencies.

5. The apparatus according to claim 1, wherein said energy supply comprises:

an oscillation source for supplying a high-frequency output to the electric scalpel;

an amplifier;

a power supply unit for supplying power to the amplifier;

a detection circuit for obtaining impedance information when said living tissue is regarded as a load; and

output control means for controlling an output of the electric scalpel in accordance with a variation in the impedance information which is obtained when one of a voltage and a frequency is dynamically varied while a power applied to the living tissue is kept constant.

6. The apparatus according to claim 1, further comprising:

output control means for controlling an output of the treatment section of the electric scalpel on the basis of the living body information obtained by the living body information detection means.

7. The apparatus according to claim 1, wherein:

said electric scalpel has a plurality of treatment electrodes for treating the living tissue,

said energy supply comprises an electric energy supply for supplying treatment electric energy to the treatment electrodes,

said variation detection means comprises means for measuring at least one of a current and a voltage between the treatment electrodes, and said detection means detects a variation in at least one of the voltage and current, and

said output control means of said living body information detection means controls an output of the electric energy supply on the basis of an output signal from the detection means, with at least one of parameters including an initial value of the detected value of the detection means, a predetermined maximum value, a predetermined minimum value and a rate of change of the detected value being selected as a condition for finishing cautery.

8. The apparatus according to claim 1, wherein.

said electric scalpel has a plurality of treatment electrodes for treating the living tissue,

said energy supply comprises an electric energy supply for supplying treatment electric energy to the treatment electrodes,

said variation detection means comprises an impedance detection circuit for detecting an impedance between the treatment electrodes, and

said output control means of said living body information detection means controls an output of the electric energy supply on the basis of an output signal from the impedance detection circuit, with a most proper one of parameters including an initial value of the detected value of the impedance detection circuit, a rate of change of the impedance, a predetermined upper limit value of the impedance and a predetermined lower limit value of the impedance being selected as a condition for finishing cautery.

9. The apparatus according to claim 1, wherein said predetermined value of impedance is calculated on the basis of a minimum value of the impedance of the living tissue, which is detected by said variation detection means after the electric scalpel begins to deliver the output.

10. The apparatus according to claim 1, wherein

said treatment section comprises a treatment electrode,

said energy supply comprises an electric energy supply for supplying treatment electric energy to the treatment electrode,

said variation detection means includes a phase difference detection means for detecting a phase difference between an output voltage and an output current during high-frequency treatment by said treatment section, and

said output control means of said living body information detection means effects said one of stopping and reducing of an output from the treatment means when a predetermined treatment finish condition for effecting said one of stopping and reducing of the output of the treatment section has been detected.

11. The apparatus according to claim 10, wherein said predetermined treatment finish condition is when a value of the detected phase difference has fallen out of a predetermined range.

12. The apparatus according to claim 10, wherein said predetermined treatment finish condition is when a rate of change of the detected phase difference has exceeded a predetermined value.

13. The apparatus according to claim 10, wherein said predetermined treatment finish condition is when a variation range of the detected phase difference has exceeded a predetermined value.

14. The apparatus according to claim 10, wherein said predetermined treatment finish condition is determined on the basis of an initial value after the treatment section begins to deliver the output.

2. An electrosurgery apparatus comprising:

a treatment device having a treatment section for treating a living tissue;

an energy supply for supplying treatment energy to the treatment section;

examination output generating means for generating an examination output for examining the state of the living tissue;

examination output supply means for supplying the examination output, which is generated by the examination output generating means, to the treatment section, such that the examination output and the treatment energy are superimposed together and are applied to the treatment section at the same time;

wherein the living tissue is treated by the treatment section while both of the treatment energy and the examination output are concurrently supplied to the treatment section; and

living body information detection means for detecting a variation in the examination output and acquiring living body information on the living tissue to be treated, on the basis of the detected variation in the examination output.

3. The apparatus according to claim 2, wherein:

said treatment section comprises a treatment electrode,

said energy supply comprises an electric energy supply section for supplying treatment electric energy to the treatment electrode,

said examination output generating means comprises examination signal generating means for generating an examination signal having a frequency different from a frequency of the treatment electric energy supplied to the treatment electrode,

said examination output supply means comprises examination signal supply means for supplying the examination signal generated by the examination signal generating means to the treatment electrode at the same time that the treatment electric energy is supplied to the treatment electrode, and

said living body information detection means detects a variation in the examination signal and acquires the living body information on the living tissue to be treated, on the basis of the detected variation in the examination signal.

15. A medical apparatus in which an electrosurgery apparatus for treating a living tissue is combined with an endoscope, the electrosurgery apparatus including an electric scalpel having a treatment for treating the living tissue, and an energy supply for supplying treatment energy to the treatment section,

the electrosurgery apparatus comprising:

variation detection means for detecting a variation in condition of the energy supplied to the treatment section while the living tissue is being treated, said variation detection means including means for measuring an impedance in the living tissue while an output is being delivered from the electric scalpel, and detection means for detecting a variation range of the measured impedance; and

living body information detection means for acquiring living body information on the living tissue to be treated, on the basis of detection data obtained by said variation detection means, said living body information detection means including output control means for effecting one of stopping and reducing of the output of the electric scalpel, while the output is being supplied, when the detection means detects the variation range of the measured impedance per unit time which is greater than the variation range of the impedance per unit time which is measured in a predetermined time period lust after the treatment section starts to treat the living tissue; and

the endoscope comprising an observation section for observing an operation of the treatment section of the electric scalpel.