Patent ID: 7666184

Claim:
A device for extending bones comprising: a first element, a second element and a drive element interconnecting the first element and the second element for moving the first and second elements relative to one another for extending a bone; said first element has at one end thereof an energy and/or data transmission element which delivers the required energy to an electronics unit which is connected to the drive element; said second element has at one end thereof means for fixing the second element to a bone that is to be extended; said drive element is connected to a drive shaft at one end thereof and imparts rotary movement thereto, said drive element comprises a planetary roller system received in a housing, said planetary roller system having at least one planetary roller, the housing has at least one radial recess formed in a circumferential surface of the housing, the at least one radial recess having an end face formed with a receiving pocket for receiving the at least one planetary roller of the planetary roller system.