Patent ID: 6361289
Filing Date: 2002-03-26
Classification: F04C

Abstract:
A medical gear pump for suction and irrigation comprising:a pump housing having an inlet and an outlet and two cylindrical openings therebetween; two meshing gears as conveying elements, one of which gears is joined to a drive mechanism, said gears being received in a non-journal-mounted fashion in the cylindrical openings of said pump housing, each of said gears comprising a plurality of helical teeth, each tooth having a tooth tip and a tooth root and forming a single continuous helix; wherein the teeth of each of said gears mesh to define a helical tooth set which, when viewed along a surface line of said gears, defines at least two tooth tip/root contact points of said meshing gears, and wherein when a tooth of a first of said gears has completely penetrated into a tooth space of a second of said gears, its tooth tip substantially completely fills up said tooth space radially inside a pitch circle of the second of said gears; and wherein said pump housing and said gears define a path for liquid flow from the inlet, radially about the gears between the gears and the pump housing, and to the outlet.