PURPOSE: To restore a constricted part after release of press to its original shape when a resilient restoration force is lowered.
CONSTITUTION: In a housing 1, a resilient deformable tube 30 is located between a rotor 20 and a support frame 21. The tube 30 is pressed by rollers 25, 25... protruded from the outer periphery of the rotor 20 to form a constricted part 31. The constricted part 31 is moved from an inflow port 10 of a tube 30 toward an outflow port 11 thereof to convey fluid. The housing 1 is brought into a closed state and the interior is brought into a negative pressure state with the aid of a suction pump 16. A pressure difference between the inside and the outside of the tube 30 is increased and restoration of the constricted part 31 is promoted.
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