Ablation system

Abstract

We provide novel techniques related to ablation procedures. [Solution] The ablation system 1 for performing ablation of biological tissue 2 using irreversible electroporation comprises a surgical instrument 4 having a shaft 10, a pair of clamping pieces 16 and a clip portion 12 including at least one ablation electrode provided on at least one of the clamping pieces 16, and an operating portion 22 for opening and closing the clip portion 12, a counter electrode plate 6, a power supply unit 26 for applying voltage to at least one ablation electrode 18 and the counter electrode plate 6, and a control unit 28 for controlling the power supply unit 26 to perform monopolar application of voltage between at least one ablation electrode 18 and the counter electrode plate 6.

Claims

1. An ablation system for performing ablation of biological tissue using irreversible electroporation, A surgical instrument comprising a shaft, a clip portion including a pair of clamping pieces provided on the tip side of the shaft and at least one ablation electrode provided on at least one of the clamping pieces, and an operating portion provided on the proximal end side of the shaft for opening and closing the clip portion, Counter electrode plate and A power supply unit that applies voltage to at least one of the ablation electrodes and the counter electrode plate, The system comprises a control unit that controls the power supply unit to perform monopolar voltage application, which applies a voltage between at least one of the ablation electrodes and the counter electrode plate, Ablation system.

2. The clip portion has a plurality of ablation electrodes, The control unit controls the power supply unit to perform a combination of bipolar voltage application, which applies voltage between the ablation electrodes, and monopolar voltage application. The ablation system according to claim 1.

3. The control unit controls the power supply unit to apply a voltage to the ablation electrode when at least the clip portion is in a closed state. The ablation system according to claim 1 or 2.

4. The control unit controls the power supply unit to apply a voltage to the ablation electrode both when the clip is in the closed state and when it is in the open state. The ablation system according to claim 3.

5. The clip portion has a plurality of ablation electrodes, The control unit, A voltage for impedance measurement is applied between the ablation electrode and the counter electrode plate, or between the ablation electrodes themselves, to measure the impedance. When the difference between the measured impedance and the reference impedance, which is a reference point for determining contact between the ablation electrode and the biological tissue, is greater than or equal to a predetermined threshold, the power supply unit is controlled to apply an ablation voltage to the ablation electrode; when the difference is less than the threshold, the power supply unit is controlled not to apply an ablation voltage to the ablation electrode. The ablation system according to claim 1 or 2.

6. The control unit controls the power supply unit so that when the pressure applied to the ablation electrode is above a predetermined threshold, it applies an ablation voltage to the ablation electrode, and when the pressure is below the threshold, it does not apply an ablation voltage to the ablation electrode. The ablation system according to claim 1 or 2.

7. The control unit, A voltage for impedance measurement is applied between the ablation electrode and the counter electrode plate, or between the ablation electrodes themselves, to measure the impedance. The power supply unit is controlled to perform the bipolar application using the ablation electrode when the difference between the measured impedance and the reference impedance, which is a reference point for determining contact between the ablation electrode and the biological tissue, is greater than or equal to a predetermined threshold, and to perform the monopolar application using the ablation electrode when the difference is less than the threshold. The ablation system according to claim 2.

8. The ablation system includes an input unit for inputting a signal to the control unit that instructs whether to perform the bipolar application method or the monopolar application method. The control unit, A voltage for impedance measurement is applied between the ablation electrode and the counter electrode plate, or between the ablation electrodes themselves, to measure the impedance. When the difference between the measured impedance and the reference impedance, which is a reference point for determining contact between the ablation electrode and the biological tissue, is greater than or equal to a predetermined threshold, the power supply unit is controlled to perform application according to the signal using the ablation electrode, and when the difference is less than the threshold, the power supply unit is controlled to perform monopolar application using the ablation electrode. The ablation system according to claim 2.

9. The control unit controls the power supply unit to perform the bipolar application using the ablation electrode when the pressure applied to the ablation electrode is above a predetermined threshold, and to perform the monopolar application using the ablation electrode when the pressure is below the threshold. The ablation system according to claim 2 or 7.

10. The ablation system includes an input unit for inputting a signal to the control unit that instructs whether to perform the bipolar application method or the monopolar application method. The control unit controls the power supply unit to perform application according to the signal using the ablation electrode when the pressure applied to the ablation electrode is above a predetermined threshold, and to perform monopolar application using the ablation electrode when the pressure is below the threshold. The ablation system according to claim 2 or 8.

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