Various embodiments are directed to an apparatus and method of driving an end effector coupled to an ultrasonic drive system of a surgical instrument. The method comprises generating at least one electrical signal. The at least one electrical signal is monitored against a first set of logic conditions.

An ultrasonic nebulizer including a circuit unit, a nebulization module, and a frequency sweeping unit. Constant electric power in the nebulization module of the ultrasonic nebulizer is maintained by automatic compensation of electric power consumption and/or current consumption. A fixed current consumption and electric power consumption of the nebulization module of the ultrasonic nebulizer is achieved by auto compensation, thereby improving nebulization performance.

Techniques are disclosed for systems and methods to provide accurate and reliable compact sonar systems for mobile structures. A sonar system includes multiple sensor channels, each comprising a sonar transmitter and a sonar receiver, and a logic device configured to provide control signals and receive sensor signals from the sensor channels. The logic device is configured to provide transmission signals to sonar transducer assemblies, where signal patterns of the transmission signals are differentiated based at least in part on frequency content. Acoustic returns are processed using the signal patterns to reduce inter-channel pickup between the sensor channels. Resulting sonar data and/or imagery may be displayed to a user and/or used to adjust a steering actuator, a propulsion system thrust, and/or other operational systems of the mobile structure.

Various embodiments are directed to a method of driving an end effector coupled to an ultrasonic drive system of a surgical instrument. The method comprises generating at least one electrical signal. The at least one electrical signal is monitored against a first set of logic conditions. A first response is triggered when the first set of logic conditions is met. A parameter is determined from the at least one electrical signal.

A system includes a needle, an actuator assembly and a generator. The needle is configured to be vibrated so as to emulsify a lens of an eye. The actuator assembly, includes a first actuator, a second actuator and a third actuator, which are distributed around a longitudinal axis of the needle and are configured to vibrate along the longitudinal axis in response to a first driving signal, a second driving signal and a third driving signal, respectively. The generator is configured to generate the first driving signal, the second driving signal and the third driving signal, so as to vibrate the needle in accordance with a predefined pattern.

Apparatus for controlling algae and bio-organisms in bodies of liquids, such as water. The algae control system includes a first set of ultrasonic transducers and a second set of ultrasonic transducers where at least the second set of transducers emits ultrasonic waves 360 degrees around a vertical axis of a submergible sonic head that includes the sets of transducers. The first set of transducers are controlled to emit ultrasonic waves within a first range of frequencies with a first selected duty cycle and said second set of transducers are controlled to emit ultrasonic waves within a second range of frequencies with a second selected duty cycle. The first and second range of frequencies target different species of organisms. The second set of transducers include one or more groups of transducers that are spaced horizontally around the vertical axis of the sonic head. The multiple groups operate independently of each other.

A piezoelectric deicing system is disclosed herein. The piezoelectric deicing system includes a flexible piezoelectric patch array including a plurality of piezoelectric devices, the plurality of piezoelectric devices configured to vibrate in response to a voltage applied at a frequency, an protective material surrounding the flexible piezoelectric patch array, wherein the protective material and the flexible piezoelectric patch array are configured to conform to a surface, and a controller operatively coupled to each of the plurality of piezoelectric devices, wherein the controller is configured to operate the plurality of piezoelectric devices over a frequency range for a period of time, the frequency applied to each of the plurality of piezoelectric devices changing by a sweep rate.

An automatic analyzer is capable of agitating a sample and a reagent by using ultrasonic waves having stable sound pressure, regardless of a characteristic variation of a piezoelectric element. The automatic analyzer agitates a sample and a reagent by using ultrasonic waves generated by driving a piezoelectric element. An amplifier configured to drive the piezoelectric element includes a voltage detection unit that detects a voltage applied to the piezoelectric element, and a current detection unit that detects a current flowing through the piezoelectric element. A calculation unit is configured to calculate effective electrical power based on a detected voltage and a detected current and determine an adjustment signal using the calculated effective electrical power and a predetermined target electrical power. An impedance matching circuit is configured to adjust output electrical power of the amplifier by changing a reactance component based on the adjustment signal determined by the calculation unit.

Various embodiments are directed to a method of driving an end effector coupled to an ultrasonic drive system of a surgical instrument. The method comprises generating at least one electrical signal. The at least one electrical signal is monitored against a first set of logic conditions. A first response is triggered when the first set of logic conditions is met. A parameter is determined from the at least one electrical signal.

In some embodiments according to the present disclosure, methods for mitigating particle retention are provided including the use of frequency sweep excitation to eject particle in the sweep. In some embodiments according to the present disclosure, the acoustically driven fluid ejector can be capable of being switched between multiple modes of operation. In other embodiments according to the present disclosure, the acoustically driven fluid ejector can be altered such that it includes the capability to be filled with a biocompatible material to aid in the mitigation of particle aggregation in the acoustically driven fluid ejector. In some embodiments according to the present disclosure, the solid structure and number of nozzles of the acoustically driven fluid ejector can be adjusted such that the ejector of the acoustically driven fluid ejector can be self-pumping, i.e. no external pumping mechanism other than acoustics driven flow drag is used.