Power supply apparatus, operating system including the power supply apparatus, and method of operating the power supply apparatus
A power supply apparatus is for a treatment instrument including a probe having electrical conductivity which vibrates, a grasping member that is opened and closed with respect to the probe and an electrode provided in the grasping member. The power supply apparatus supplies high-frequency power between the probe and the electrode. The power supply apparatus includes a resistance acquisition circuit which repeatedly acquires a resistance value of electrical resistance between the probe and the electrode, a condition determination circuit which acquires the number of times the resistance value satisfies a predetermined condition while the probe is vibrating and power is supplied between the probe and the electrode, and a determination circuit which determines whether or not the probe and the electrode are electrically short-circuited based on the number of times.
1. A power supply apparatus for a treatment instrument that includes a probe having electrical conductivity which vibrates, a grasping member that is opened and closed with respect to the probe and an electrode provided in the grasping member, the apparatus supplying high-frequency power between the probe and the electrode, the apparatus comprising:
an ultrasonic drive circuit configured to supply power to the probe to generate ultrasonic vibrations;
a resistance acquisition circuit which repeatedly acquires a resistance value of electrical resistance between the probe and the electrode;
a counter indicating a number of times the resistance value satisfies a predetermined condition;
a condition determination circuit which increments the counter each time the resistance value satisfies the predetermined condition while the probe is vibrating and power is supplied between the probe and the electrode; and
a determination circuit which:
repeatedly acquires a time that has elapsed after acquiring the resistance value,
determines whether a determination period has elapsed based on the acquired time, and
determines that the probe and the electrode are electrically short-circuited based on: (i) a total of the counter exceeding a predetermined reference number, and (ii) the determination period being elapsed.
2. The power supply apparatus according to claim 1 , wherein
the resistance acquisition circuit acquires the resistance value at predetermined sampling time intervals based on the high-frequency power supplied between the probe and the electrode,
the condition determination circuit compares the resistance value with a predetermined threshold value to acquire the number of times the predetermined condition is satisfied, and
the determination circuit determines that the probe and the electrode are electrically short-circuited when the number of times exceeds the predetermined reference number of times during a predetermined determination period.
3. The power supply apparatus according to claim 1 , wherein
the condition determination circuit compares the resistance value with a predetermined threshold value to acquire the number of times that the resistance value becomes less than the predetermined threshold value, and
the determination circuit determines that the probe and the electrode are electrically short-circuited when the number of times exceeds the predetermined reference number of times during a predetermined determination period.
4. The power supply apparatus according to claim 1 , wherein the resistance acquisition circuit acquires the resistance value at sampling time intervals shorter than a vibration period of the probe.
5. The power supply apparatus according to claim 4 , wherein
the condition determination circuit acquires the number of times a resistance value obtained during a target period based on the vibration period becomes less than a predetermined threshold value with reference to a time when the resistance value becomes less than the predetermined threshold value, and
the determination circuit determines that the probe and the electrode are electrically short-circuited when the number of times exceeds the predetermined reference number of times during a predetermined determination period.
6. The power supply apparatus according to claim 5 , wherein the target period is a predetermined period set for each vibration period with reference to a time when the resistance value becomes less than the predetermined threshold value.
7. The power supply apparatus according to claim 1 , wherein
the resistance acquisition circuit acquires the resistance value at predetermined sampling time intervals,
the condition determination circuit acquires the number of times a variation width of the resistance value exceeds a predetermined threshold value, and
the determination circuit determines that the probe and the electrode are electrically short-circuited when the number of times exceeds the predetermined reference number of times during a predetermined determination period.
8. An operating system comprising:
the power supply apparatus according to claim 1 ; and
the treatment instrument.
9. The power supply apparatus according to claim 2 , wherein the predetermined determination period is longer than a vibration period of the probe.
10. The power supply apparatus according to claim 9 , wherein at least one sampling time interval during which the resistance value is acquired is shorter than the vibration period of the probe.
11. The power supply apparatus according to claim 1 , further comprising;
a timer that measures the time that has elapsed after acquiring the resistance value.
12. A power supply apparatus for a treatment instrument that includes a probe having electrical conductivity which vibrates, a grasping member that is opened and closed with respect to the probe and an electrode provided in the grasping member, the apparatus supplying high-frequency power between the probe and the electrode, the apparatus comprising:
an ultrasonic drive circuit configured to supply power to the probe to generate ultrasonic vibrations
a resistance acquisition circuit which repeatedly acquires a resistance value of electrical resistance between the probe and the electrode;
a counter indicating a number of times the resistance value satisfies a predetermined condition;
a condition determination circuit that increments the counter each time a signal of the resistance value satisfies the predetermined condition for a predetermined period while the probe is vibrating and power is supplied between the probe and the electrode, the signal of the resistance value being filtered by a filter and whose cut-off frequency is determined based on a vibration frequency of the probe; and
a determination circuit which:
repeatedly acquires a time that has elapsed after acquiring the resistance value,
determines whether a determination period has elapsed based on the acquired time, and
determines that the probe and the electrode are electrically short-circuited based on: (i) a total of the counter exceeding a predetermined reference number, and (ii) the determination period being elapsed.
13. A method of operating a power supply apparatus for a treatment instrument including a probe having electrical conductivity which vibrates, a grasping member that is opened and closed with respect to the probe and an electrode provided in the grasping member, the apparatus supplying high-frequency power between the probe and the electrode, the method causing the power supply apparatus to:
supply power, by an ultrasonic drive circuit, to the probe to generate ultrasonic vibrations;
repeatedly acquire a resistance value of electrical resistance between the probe and the electrode;
increment a counter each time the resistance value satisfies a predetermined condition while the probe is vibrating and power is supplied between the probe and the electrode, the counter indicating the number of times the resistance value satisfies the predetermined condition;
repeatedly acquire a time that has elapsed after acquiring the resistance value;
determine whether a determination period has elapsed based on the acquired time; and
determine that the probe and the electrode are electrically short-circuited based on: (i) a total of the counter exceeding a predetermined reference number, and (ii) the determination period being elapsed.