Abstract: An injection needle disposal device includes a housing, a grinding wheel having a plurality of impellers of an exhaust fan surrounding the grinding wheel, a main driving motor rotating the grinding wheel and the impellers, a positioning disk secured on the housing for inserting an injection needle secured with a syringe into the housing to be ground by the grinding wheel and the dust of the ground needle is sucked by the impellers and exhausted outwardly to be collected by a collection bag connected with the housing.

Abstract: An apparatus and novel method for processing medical waste materials comprising an elongate pressure vessel of generally cylindrical configuration having an inlet end, and a closely fitting closure member for the inlet. An elongate drum of generally cylindrical configuration is mounted in the vessel for rotation about its longitudinal axis, which drum can be selectively driven in either rotative direction. The longitudinal axis of the drum is disposed at a slight angle of incline to the horizontal, placing the inlet end at a slightly higher elevation than the opposite end. A helically configured member is disposed along the interior perimeter of said drum, such that during rotation of the drum in a first rotative direction, the helically configured member moves the waste material in a direction away from the inlet end of the drum, whereas during rotation of the drum in the second rotative direction, the helically configured member moves the waste material toward the inlet.