Patent ID: 6416321
Filing Date: 2002-07-09
Classification: A61C

Abstract:
A dental hand instrument having a handpiece, a grip part arranged on the handpiece, an outlet opening in said handpiece for the discharge of an abrasive treatment medium, a coupling connection said connection being a coupling part of a coupling arranged on the hand instrument for coupling the hand instrument to supply lines for the separate infeed of transport fluids comprising water and air, a first delivery line for the water, said first delivery line extending from the coupling connection to a first outlet opening, a supply container for the abrasive treatment medium which is connected with a second delivery line for the transport of air to the supply container, said air being admixed with the abrasive treatment medium in said supply container and in conjunction with said abrasive treatment medium being transported to a second outlet opening arranged adjacent to said first outlet opening, and a non-return valve arranged in the second delivery line in an intermediate position between the coupling connection and an inlet of said second delivery line into said supply container, so as to prevent back-flow of the abrasive treatment medium into the region of the coupling connection.