Anoscopes, Proctoscopes, Sigmoidoscopes, Sphincteroscopes
Other than specula and retractors, these instruments are not to be expanded. In most cases a piston is to be removed after insertion in order to get access to the end of the tube. In the case of the Brinkerhoff one side of the tube is slid out to gain acess to the wall of the sphincter and rectum.

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