Patent ID: 6457974
Filing Date: 2002-10-01
Classification: A61C,B24C

Abstract:
A dental instrument for directing an abrasive laden stream to a surface to be abraded comprising:a body having a fluid inlet end for connecting to a supply of fluid and a fluid discharge end for directing a fluid to a surface to be abraded, said body including at least one passageway extending from said inlet end to said discharge end; and a supply of an abrasive material connected to said body comprising a tube arrangement in fluid communication with the at least one body passageway and a canister for holding an abrasive material, wherein said tube arrangement comprises an inner sleeve and an outer sleeve surrounding said inner sleeve, said inner sleeve having a fluid inlet conduit formed therein and said outer sleeve forming an annular fluid outlet conduit between said inner and outer sleeve, wherein a fluid enters said canister from said body through said inlet conduit, said fluid becoming mixed with said abrasive material in said canister and said fluid/abrasive material mixture is provided from said canister through said annular fluid outlet conduit to the at least one body passageway for discharge from the fluid discharge end of the body, wherein said tube arrangement has a first end and a second end, said first end being generally disposed within said canister and said second end having a cooperating coupling device for coupling said canister to said body, and wherein said cooperating coupling device includes a keyway groove, said keyway groove providing fluid communication between said annular fluid conduit and said at least one body passageway through said cooperating coupling device.