05234428 is referenced by 158 patents and cites 18 patents.

An electrosurgical pencil comprises a body having air flow passages through the body connectable at one end to a vacuum source and opening at their other ends into a shroud providing an annular opening about the electrode blade of the pencil, the shroud, blade and various passages being configured such that the air flow intake velocity into the shroud is at least approximately twice the diffusion velocity of smoke generated at an incision produced by the blade of the pencil.

Title
Disposable electrocautery/cutting instrument with integral continuous smoke evacuation
Application Number
7/713070
Publication Number
5234428
Application Date
June 11, 1991
Publication Date
August 10, 1993
Inventor
David I Kaufman
743 College Ct., Los Altos, 94022
CA, US
Agent
Howard L Rose
IPC
A61B 17/39
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