Coupling device for detachably connecting a medical or dental instrument to a drive unit or a supply hose

A coupling device for detachably connecting a medical or dental instrument to a drive unit or a supply hose for transfer of at least one of data, energy, a driving movement and a working medium between the drive unit or the supply hose and the instrument, comprising:

• a first coupling element and a second coupling element, wherein one of the first and second coupling elements comprises a coupling recess and the other of the first and second coupling elements comprises a coupling protrusion insertible into the coupling recess, and wherein
• one of the first and second coupling elements comprises a positioning element and the other of the first and second coupling elements comprises an indentation into which the positioning element can be inserted to position the coupling elements in a defined angular position about a shared axis relative to one another, wherein one of the coupling elements comprises a memory unit for storage of data and the other of the coupling elements comprises a transfer unit, so that data can be transferred from the memory unit of the one coupling element to the other coupling element by the transfer unit.