The present invention provides a medical washer for deactivating surfaces of a medical instrument or device having a lumen. The medical washer includes a housing that defines a chamber dimensioned to contain a liquid and to receive a medical instrument having a lumen. A primary conduit is connected at both ends to the chamber to define a recirculating path for liquid in the chamber. A suction device having an inlet port, an outlet port, and a suction port is disposed within said primary conduit such that the inlet port and the outlet port are fluidly connected to the primary conduit. A suction conduit has a first end that is fluidly connectable to a lumen on a medical instrument and a second end that is fluidly connected to the suction port of the suction device. The suction device is dimensioned such that a flow of the liquid through the suction device creates a negative pressure at the suction port.