Patent ID: 8500447

Claim:
A medical treatment device, comprising: a drive unit configured to drive a tool that is connectable to the drive unit and being configured to act on a treatment site; a light-emitting device configured to emit visible light onto one or both of the tool and the treatment site; a cooling media dispensing device configured to dispense at least one cooling medium from the medical treatment device onto one or both of the tool and the treatment site; and a controller configured to control the light-emitting device and the cooling media dispensing device to operate alternatingly with respect to each other, thereby causing visible light from the light-emitting device to be emitted alternatingly with dispensing of the at least one cooling medium from the dispensing device, wherein a pulse rate of the light-emitting device controlled by the controller is at least about 25 Hz, so as to provide the user of the medical treatment device with the impression that the visible light is continuously emitted.