Bonafont speculum

This bivalve speculum was designed by Dr Bonafont. This speculum was used to examine both ear and nasal cavities. This instrument is made of chomed steel and is conical in shape. The size of the tip of the cone is adjustable because of the presence of two trough like blades. These two blades form the entire speculum's form. At the fulcrum these blades flare outwards slightly thereby allowing room for expansion.

An U shaped strip of metal surrounds the flange. This metal is attached to the blade at two points and is run through with a threaded rod. The speculum's degree of exansion can be increased or decreased by altering the distance between the U shaped component and the blade. It has a circular knob and is finely grooved. The speculum is 2 inches long and one and half inches at its widest point.

Since this speculum is self retaining it allows both hands of the surgeon free to perform aural / nasal surgeries.