Apparatus for generating ultrasonic oscillation
June 20, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3746897 Matching network for switchable segmented ultrasonic transducers High efficiency high frequency power oscillator Device to operate a piezoelectric ultrasonic transducer Surgical system for powered instruments Handpiece interlock and logic control for ultrasonic surgical system Ultrasound power generating system with sampled-data frequency control Analog drive for ultrasonic probe with tunable phase angle Ultrasonic power supply Method and apparatus for ultrasonic surgical cutting and hemostatis InventorsAssigneeApplicationNo. 895839 filed on 06/09/1992US Classes:604/22, With means for cutting, scarifying, or vibrating (e.g., ultrasonic, etc.) tissue310/316.01, Input circuit for simultaneous electrical and mechanical output from piezoelectric element601/2, Ultrasonic606/128, With fragmenting means606/169Cutter having vibratory drive meansExaminersPrimary: Pfaffle, Krista M.Attorney, Agent or FirmForeign Patent References
International ClassesA61B 017/22A61B 017/32 Foreign Application Priority Data1989-04-28 JPAbstractThe apparatus includes an ultrasonic transducer having a hand piece, an ultrasonic vibrating element secured to the hand piece and a probe coupled with the hand piece for propagating the ultrasonic oscillation produced by the ultrasonic vibrating element, a driving circuit for producing a driving signal for the ultrasonic vibrating element, a voltage controlled amplifier for amplifying the driving signal, an impedance matching transformer having a plurality of primary windings connected to the output of the voltage controlled amplifier via a switching circuit and a secondary winding connected to the ultrasonic vibrating element, a probe identification circuit for detecting the probe connected to the hand piece to produce a probe identification signal, a feedback control loop for generating a control voltage which is applied to the voltage controlled amplifier for controlling the amplification factor thereof in accordance with a driving current of the driving signal, an impedance detecting circuit for detecting the impedance of the ultrasonic transducer and controlling, the switching circuit such that a given primary winding is connected to attain the impedance matching between the driving circuit and the ultrasonic transducer, and a voltage limiter arranged in the feedback control loop such that the maximum value of the control voltage is limited in accordance with the probe identification signal.Field of SearchWith means for cutting, scarifying, or vibrating (e.g., ultrasonic, etc.) tissueCutter having vibratory drive means Cutter carried on elongated probe-like member Recriprocating or oscillating cutter Surface acoustic wave devices Electrical systems Temperature compensation circuits Input circuit for simultaneous electrical and mechanical output from piezoelectric element Traveling wave motor Charging and discharging Input circuit for mechanical output from piezoelectric element | |
