05421829 is referenced by 413 patents and cites 9 patents.

An ultrasonic oscillator drives a tool at a set frequency. An amplitude control runs the oscillator to set the vibration level. A frequency regulator joins the amplitude and the oscillator. A control feedback loop, in the frequency regulator, keeps handpiece linear dynamics. An operational transconductance amplifier, in the oscillator, governs gain of the loop. A circuit connects to the control to retard the rate of current application over time to the amplifier. The circuit has switching to either retard the rate or reset for start up. The amplifier is a current output device with current directly proportional to the bias current and input voltage with bias as gain change for the loop. The circuit limits the bias to the amplifier to modify frequency response and output current. A capacitor delays application of the bias to the amplifier. Replaceable tools of various lengths or shapes positioned along an axis vibrate for surgery at the frequency and a wave length. Tools longer than one wavelength and of configurations tuned to oscillate around the frequency resonate as a function of their material, length and configuration. A flue surrounds the tool and has a hollow elongate semi rigid central body about an axis with a funnel, at one end thereof and a nozzle, at the other to direct annular irrigant/coolant flow therethrough. The funnel and nozzle are resilient. Reinforcing ridges, inside the nozzle, act to maintain concentricity between the flue and nozzle tip and channel irrigant thereabout.

Title
Ultrasonic surgical handpiece and an energy initiator
Application Number
982936
Publication Number
5421829
Application Date
May 13, 1994
Publication Date
June 6, 1995
Inventor
Alexander S Kreizman
Beechhurst
NY, US
Alan Broadwin
Brooklyn
NY, US
Emery S Rose
New York
NY, US
Michael S Klicek
Boulder
CO, US
Michael D Olichney
Boulder
CO, US
Agent
Aaron Passman
Lawrence C Akers
Peter C Richardson
Assignee
Valleylab
CO, US
IPC
A61B 17/32
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