A liquid ejection control apparatus, which controls a drive voltage waveform applied to a piezoelectric element so as to control ejection of a pulsed liquid jet, includes a first operation unit that receives input of an index value for setting a position of an inflection point in a rising portion of the drive voltage waveform, and a control unit that sets the position of the inflection point in the rising portion of the drive voltage waveform according to the index value so as to control changing of the drive voltage waveform.

In a liquid ejection control apparatus, an operation unit includes adjustment levers for changing a rising frequency, voltage amplitude, and the like of a drive voltage waveform applied to a piezoelectric element. In a control unit, a rising frequency setting section sets a rising frequency in response to an input operation on a rising frequency adjustment lever so as to make constant a change amount regarding momentum related to a pulsed liquid jet ejected from a liquid ejection device and the change amount per unit operation level for the rising frequency adjustment lever in a state in which voltage amplitude of the drive voltage waveform is set to a predetermined value.

An ultrasonic instrument includes a body, an actuation assembly, a shaft assembly, and an end effector. The actuation assembly includes a mode selection member and an activation member. The shaft assembly extends distally from the body. The shaft assembly includes an acoustic waveguide. The end effector includes an ultrasonic blade. The ultrasonic blade is in acoustic communication with the acoustic waveguide. The end effector is configured to be activated in a first activation mode in response to actuation of the activation member when the mode selection member is in a first position. The end effector is configured to be activated in a second activation mode in response to actuation of the activation member when the mode selection member is in a second position.

A surgical instrument includes an end effector and a handle assembly. The end effector is configured to operate at a first energy level and at a second energy level. The end effector is further configured to transition between an open position and a closed position. The end effector is configured to grasp tissue in the closed position. The handle assembly includes a body, a trigger, and an activation element. The trigger is configured to pivot in a first direction relative to the body to actuate the end effector from the open position to the closed position. The activation element is configured to activate the end effector at either the first energy level or the second energy level. The trigger is configured to either activate the activation element or determine whether the end effector operates at the first energy level or the second energy level.

In a liquid ejection control apparatus, an operation unit includes an adjustment lever that is used to input an indication value of momentum or kinetic energy related to a pulsed liquid jet ejected from a liquid ejection device. A control unit includes a frequency setting portion that sets a rising frequency of a drive voltage waveform applied to a piezoelectric element and an amplitude setting portion that sets the amplitude of the drive voltage waveform, so that momentum or kinetic energy has an indication value.

In a liquid ejection control apparatus, an operation unit includes an energy dial used to input an energy indication value related to kinetic energy of a pulsed liquid jet ejected from a liquid ejection device, and a repetition frequency dial used to input a repetition frequency indication value related to the number of times of ejection per unit time of the pulsed liquid jet. A control unit includes a rising waveform shape setting section which sets a rising waveform shape of a drive voltage waveform so that the kinetic energy has the energy indication value on the basis of voltage amplitude of the drive voltage waveform and the repetition frequency indication value. The repetition frequency dial may be omitted, and a repetition frequency may be fixed to a predetermined value.

A liquid ejection control apparatus, which controls a drive voltage waveform applied to a piezoelectric element so as to control ejection of a pulsed liquid jet, includes a first operation unit that receives input of an index value for setting a flow velocity peak timing of a main jet of the pulsed liquid jet, and a control unit that sets a rising portion of the drive voltage waveform according to the index value so as to control changing of the drive voltage waveform.

Described herein are systems and methods for implementing a power source for a shock wave catheter system, the power source including two separate voltage sources: a bubble generation voltage source and an arc generation voltage source. In one or more examples, the power source can be configured such that the bubble generation voltage source provides a lower voltage to a pair of electrodes of the shock wave catheter system. The lower voltage can be configured to induce electrolysis of a fluid that surrounds the pair of electrodes of the shock wave catheter system for generating and growing a bubble. Once a bubble has formed, the arc generation voltage source can then be engaged to provide a high-voltage electrical pulse to the electrodes of the shock wave catheter system, thereby generating an arc (i.e., spark) across the electrodes.

In a liquid ejection control apparatus, an operation unit includes an energy dial used to input an energy indication value related to kinetic energy of a pulsed liquid jet ejected from a liquid ejection device, and a repetition frequency dial used to input a repetition frequency indication value related to the number of times of ejection per unit time of the pulsed liquid jet. A control unit includes a rising waveform shape setting section which sets a rising waveform shape of a drive voltage waveform so that the kinetic energy has the energy indication value on the basis of voltage amplitude of the drive voltage waveform and the repetition frequency indication value. The repetition frequency dial may be omitted, and a repetition frequency may be fixed to a predetermined value.

A liquid ejection control apparatus, which controls a drive voltage waveform applied to a piezoelectric element so as to control ejection of a pulsed liquid jet, includes a first operation unit that receives input of an index value for setting a position of an inflection point in a rising portion of the drive voltage waveform, and a control unit that sets the position of the inflection point in the rising portion of the drive voltage waveform according to the index value so as to control changing of the drive voltage waveform.