A - Human Necessities – 61 – C
Patent
A - Human Necessities
61
C
A61C 17/32 (2006.01)
Patent
CA 2280410
The water valve links a dental handpiece to its tubing. The tubing conventionally has a high-pressure air tube in which air will flow when the handpiece is selectively activated, a cooling water tube for cooling the handpiece head and the patient's tooth during use of the handpiece head, a cooling air tube for converting the cooling water flow into an atomized water spray, and a discharge tube, in which part of the high-pressure air flow are carried away from the dental handpiece. The water circulation device includes a valve which has four inner conduits each operatively linking the respective tubes to the dental handpiece. Furthermore, a bypass channel is formed in the valve, between the valve member water conduit and discharge conduit. A piston is movable in the bypass channel, between a first unobstructive position in which the water is free to flow from the water conduit into the discharge conduit, and a second obstructive position in which the piston blocks in a fluid-tight fashion the bypass channel, to prevent the water from flowing into the discharge conduit. A spring continuously forces the piston towards its first unobstructive position. Thus, in the handpiece inoperative condition, when no high-pressure air flow runs through the high-pressure air conduit, the water is free to flow in the valve from the water conduit into the discharge channel, thus not reaching the handpiece and continuously flowing to prevent the water from stagnating. When the handpiece is activated, the high-pressure air flow forces the piston through an air channel communicating with the piston channel, against the action of the spring towards its second limit position, thus blocking the bypass channel and allowing the water to flow conventionally into the handpiece.
Lachapelle Claude
Na
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