Operation device
December 23, 2011. 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 ReferencesSonic transducer and drive circuit Reciprocation vitreous suction cutter head Surgical instrument for ultrasonic separation of biological tissue Driving system for an ultrasonic piezoelectric transducer Angulated ultrasonic surgical handpieces and method for their production Drive network for an ultrasonic probe Method and apparatus for the identification of oscillatory properties as well as for the operation of a piezo-electric tranducer Apparatus for trimming meniscus Ultrasonic driving device Method for removing cellular material with endoscopic ultrasonic aspirator InventorsAssigneeApplicationNo. 813053 filed on 12/23/1991US 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 element310/325, Sandwich or Langevin type606/39, Cutting606/45, Cutting606/128, With fragmenting means606/170, Cutter carried on elongated probe-like member606/171Recriprocating or oscillating cutterExaminersPrimary: Cohen, Lee S.Assistant: Pfaffle, K. M. Attorney, Agent or FirmForeign Patent References
International ClassesA61B 017/32H01L 041/08 Foreign Application Priority Data1989-04-27 JPAbstractA surgical operation device comprising an ultrasonic piezoelectric transducer for generating ultrasonic vibrations, an oscillation feedback type oscillator for supplying high-frequency power to the ultrasonic transducer, a vibration transmitter connected to the ultrasonic transducer for transmitting and amplifying mechanical vibrations at an ultrasonic frequency, a suction unit and an irrigator. The ultrasonic transducer includes a bolted Langevin type transducer. The feedback circuit of the oscillation feedback type oscillator includes an oscillation voltage detector, a phase comparator, a low pass filter, a differential amplifier, and a voltage controlled oscillator. Thus, the mechanical resonant frequency can be traced in a wide range of fluctuations of a load on the vibration transmitter during vibration and vibrations can start an appropriate mechanical resonate frequency irrespective of the load status of the vibration transmitter at the start-up.Field of SearchWith means for cutting, scarifying, or vibrating (e.g., ultrasonic, etc.) tissueMaterial introduced into and removed from body through passage in body inserted means Having body piercing means Combined cutting-coagulation With feed back control Cutting Cutting Cutter having vibratory drive means Cutter carried on elongated probe-like member Recriprocating or oscillating cutter Means to limit cutter penetration depth (e.g., dura guard) Input circuit for mechanical output from piezoelectric element Input circuit for electrical output from piezoelectric element Electrical output circuit Sandwich or Langevin type | |
