A system configured to enclose a premature fetus within an extracorporeal environment to promote growth of the fetus and increase viability of the fetus. The system includes a chamber having an interior space configured to enclose the fetus, a first fluid circuit that delivers sterile fluid to the chamber, and a second fluid system that transfers oxygen to the fetus. The system chamber includes a stop mechanism including a clamp and an actuator, the clamp positioned in the interior space, the actuator coupled to the clamp such that movement of the actuator moves the clamp, and the actuator positioned at least partially outside the interior space.
