Title:
超音波手術システム
Document Type and Number:
Japanese Patent JP4159771
Kind Code:
B2
Abstract:
An ultrasonic surgical system utilizes a digital control system to generate ultrasonic drive current for transducers (36) that are located in a hand piece (30) and are attached to a surgical scalpel or blade (32) in the hand piece so as to vibrate the blade in response to the current. The digital control includes a digital signal processor (DSP) or microprocessor (60); a direct digital synthesis (DDS) device; a phase detection logic scheme, a control algorithm for seeking and maintaining resonance frequency; and design scheme that allows to regulate current, voltage, and power delivered to an ultrasonic thereby a device. Such system allows the power versus load output curve to be tailored to a specific hand piece, which improves efficiency and reduces heat. Further, the components of the digital system are much less sensitive to temperature variations, thereby allowing it to operate with narrow as needed frequency range around the desired resonance in order to avoid excitation of other resonances. Also, the digital system provides increased flexibility in locating the resonance frequency of the blade and running diagnostic tests. The start of a user initiated diagnostic test that requires movement of the blade is caused by operating two of the system switches, which guards against accidental operation of the blade which could be harmful if in contact with tissue and also generate false diagnostic results. In addition, the system has interlock with an Electrosurgical unit so that it is not effected by the electromagnetic interference generated by that unit.
Inventors:
Eitan Tea Wiener
William T. Donofrio
William T. Donofrio
Application Number:
JP2001324101A
Publication Date:
October 01, 2008
Filing Date:
October 22, 2001
Export Citation:
Assignee:
Ethicon Endo-Surgery,Inc.
International Classes:
A61B17/3211; A61B18/00; A61B17/32; B06B1/02; B06B1/06; H03B5/30; A61B17/00
Domestic Patent References:
| JP2647713B2 |
Attorney, Agent or Firm:
Konobu Kato