Apparatus for washing and disinfecting endoscope and brush cassette detachably attached thereto

An endoscope washer-disinfector cleans and disinfects an endoscope with a duct. A brush cassette is detachably loaded to a loading part of the washer-disinfector and comprises a brush element and a shaft holding the brush element. Inside the cassette, first and second members are formed to hold the shaft tight therebetween for making the shaft advance and retreat to and from the duct. A lock device separates the second member from the first member so that the second member is located at a first position. The lock device locks the separated second member, when the brush is not loaded on the loading part. When the cassette is loaded to the loading part, the lock device also unlocks the locked second member responsively to an operating force and allows the second member to be moved to a second position where the first and second members hold tight the shaft.