公开(公告)号：JP2506563B2

公开(公告)日：1996-06-12

申请号：JP51402793

申请日：1992-11-06

Applicant: VALLEYLAB INC

Inventor： ROOZU EMERII ESU

IPC: A61B18/00 ,  A61B17/00 ,  A61B17/32 ,  A61B18/12 ,  A61F9/007 ,  A61M3/02 ,  B06B1/02 ,  A61B17/36

公开(公告)号：JPH08103452A

公开(公告)日：1996-04-23

申请号：JP23045995

申请日：1995-09-07

Applicant: VALLEYLAB INC

Inventor： ROOZU EMERII ESU

IPC: A61B18/00 ,  A61B17/00 ,  A61B17/32 ,  A61B18/12 ,  A61F9/007 ,  A61M3/02 ,  B06B1/02 ,  A61B17/36

Abstract: PROBLEM TO BE SOLVED: To make it possible to correct errors with suitable algorithms and efficiently control the frequency by using an original control loop including a feedback piezoelectric crystal in combination with a piezoelectric transducer in a control system for monitoring which is suitable for a surgical hand piece. SOLUTION: A surgical hand piece comprises a piezoelectric crystal transducer 3 for generating ultrasonic wave. The transducer 3 is controlled by an electrical apparatus having a phase simultaneity loop 12 sending the output signal of a feedback piezoelectric crystal 5 to a voltage control oscillator 1 through a phase comparator 8 and a loop-filter 10. The electrical apparatus further comprises an RMS-DC-converter 15 inputting the output signal of the feedback piezoelectric crystal 5, an adding node 17 and an automatic gain control loop 13 consisting an error amplifier 19 and a limiter circuit 21. The electrical apparatus outputs control signals in correspondence with the deviation of the output signals of loops 12, 13.