Title:
DRIVING CIRCUIT FOR PREVENTING INTERNAL CONTAMINATION OF HANDPIECE
Document Type and Number:
Japanese Patent JP2008237853
Kind Code:
A
Abstract:
To provide a driving circuit for preventing internal contamination of a handpiece, preventing patient's saliva and cutting pieces of a tooth from being sucked into the handpiece when stopping to use the handpiece.
A proportional control valve 5 is provided on an air supply pipe 4 for supplying compressed air from a compressed air source 3 to an air turbine 2; an exhaust valve 7 is provided on an air discharge pipe 6; and when stopping to use the air turbine, and if the exhaust valve 7 is closed, the air supply flow of the proportional control valve 5 is simultaneously adjusted not to rotate the air turbine by electric control from a control circuit 8, whereby the interior of the handpiece is always kept at the positive pressure state.
Inventors:
ENDO AKIRA
Application Number:
JP2007112375A
Publication Date:
October 09, 2008
Filing Date:
March 27, 2007
Export Citation:
Assignee:
YOSHIDA SEISAKUSHO KK
International Classes:
A61C1/05; A61G15/16
Domestic Patent References:
JPH03140151A | 1991-06-14 | |||
JP2912092B2 | 1999-06-28 | |||
JPH06142116A | 1994-05-24 | |||
JPS63150064A | 1988-06-22 | |||
JPS63150064A | 1988-06-22 | |||
JPH0282963A | 1990-03-23 | |||
JPH06261915A | 1994-09-20 | |||
JPH03140151A | 1991-06-14 | |||
JP2912092B2 | 1999-06-28 | |||
JPH06142116A | 1994-05-24 |