The present invention provides a kind of medical system, has: multiple medical instruments (1A, 1B), each to be inserted into body from body surface with a long, thin inserted part (2A, that internal 2B) Protection part (4A it 4B) provides together respectively in each built-in fitting (2A end and one can be in connection and be spaced from each other distally toward at the position that space multiple medical instruments (1A, 1B) 2B) separates And control the two sides (2A built-in fittings, 2B) that bottom end is partially set together and a kind of engagement and separation (4A, 4B) for controlling fixation member.
