Turbine wheel for a gas operated medical handpiece and medical handpiece having a turbine wheel, and method for milling a blade of a turbine wheel

A medical handpiece, comprising:

• an elongate grip part;
• a holder device for a tool rotatably mounted in a forward end region of the elongate grip part;
• a turbine wheel rotatably mounted in the handpiece and drivably connected to the holder device;
• and
• a delivery line for a gas that directs emerging gas flow against the turbine wheel;
• wherein the turbine wheel has a plurality of blades extending from a hub and a ring web connecting the plurality of blades along one side of the plurality of blades, another side of the plurality of blades remaining unattached to the ring web forming free blade ends, the front side of each blade being concavely curved about an approximately radially running first axis of curvature, the delivery line being directed against the front side of each blade and angled away from the free blade ends the respective blade,
• and the front side of each blade being hollow in radial direction.

A medical handpiece comprising:

• an elongate grip part;
• a holder device for a tool rotatably mounted in a forward end region of the elongate grip part;
• a turbine wheel rotatably mounted in the handpiece and drivably connected to the holder device, the turbine wheel including,
• a plurality of blades the front side of at least on blade being concavely curved about an approximately radially running first axis of curvature, and
• a rear side of the at least one blade, and
• a delivery line for a gas that directs emerging gas flow against the front sides of the plurality of blades,
• wherein
• an acute angle is formed between a longitudinal middle plane radially extending from an axis of rotation of the turbine wheel and intersecting an apex of the at least one blade in a middle axial region, and the rear side of the at least one blade, the acute angle being smaller than 38°.