#$%^&*AU2017261460B120180322.pdf#####ABSTRACT A sigmoidoscope has a main body (10) and an illuminating assembly (20). The main body (10) has an optic head (11) having a channel (111) extending through the optic head (11) and a positioning recess (114). The 5 illuminating assembly (20) has a circuit board (21) and multiple light emitting elements (22) and a tact switch (23) mounted to the circuit board (21). The circuit board (21) is disposed in the positioning recess (114) and has a central hole (211) aligned with the channel (111). The multiple light emitting elements (22,22A) and the tact switch (23) are electrically connected to the circuit board 10 (21). The tact switch (23) has a pushing button (231) extending over a rim of the central hole (211). The pushing button (231) can be pressed by an inserting tube (43) of a speculum assembly (40) that is inserted into the central hole (211).
