Nxstage Medical, Inc.

Jacob A Clark

Joseph A Hoell, Jr

Garrick C Adolf

Derek Bruce Eldridge

A cartridge insertion system includes a chassis supporting a fluid circuit, the chassis having a forward end with key pins projecting from the forward end and a rear end. The system also includes a medical treatment device with a slot opening closed by doors having a major dimension and having key openings spaced apart a same distance as the key pins on the chassis, such that when the chassis is pushed toward the slot opening, the key pins enter the key openings before the forward end meets the doors. The key pins push against latches that hold the door locked shut, so that the doors will not open if a cartridge without key pins is pressed against the door. When a cartridge with key pins is used, the doors unlock and allow the cartridge to be inserted.

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Stoneham, MA, United States of America

Jacob A Clark