Peristaltic pump device

Abstract

A peristaltic pump device is provided with a tube allowing the passage of a fluid, a tube holder holding the tube, and a base to which the tube holder is fitted. A rotor is attached rotatably onto the base, and rollers are pivotally supported on the rotor and configured to rotate while pressing and crushing the tube. A substantially U-shaped tube holding groove is formed on a bonded surface of the tube holder on the base side. A depth of the tube holding groove is formed to be shorter than an outer diameter of the tube. When the tube is inserted into the tube holding groove, the tube is held inside the tube holding groove by a frictional resistance caused by a restoring elastic force of the tube.

What is claimed is: 
     
         1 . A peristaltic pump device comprising:
 a tube allowing the passage of a fluid;   a tube holder holding the tube;   a base to which the tube holder is fitted;   a rotor attached rotatably onto the base; and   at least one roller pivotally supported on the rotor and configured to rotate while pressing and crushing the tube, wherein   a tube holding groove is formed on a bonded surface of the tube holder on the base side,   a depth of the tube holding groove is formed to be shorter than an outer diameter of the tube, and   the depth of the tube holding groove is formed so that, when the tube is inserted into the tube holding groove, the tube is held inside the tube holding groove by a frictional resistance caused by a restoring elastic force of the tube.   
     
     
         2 . The peristaltic pump device according to  claim 1 , wherein
 on the bonded surface of the tube holder on the base side, a concave portion is formed so as to allow a portion of the rotor to enter, and at substantially the center of the bonded surface, a positioning convex portion to be positioned by contact with the surface of the rotor is provided.   
     
     
         3 . The peristaltic pump device according to  claim 1 , wherein
 the peristaltic pump device is configured so that the tube is exposed so as to become removable when the tube holder is removed from the base.   
     
     
         4 . The peristaltic pump device according to  claim 1 , wherein
 the rotor is held on the base movably in an axial direction, and a spring member configured to bias the rotor to the tube holder side is provided.   
     
     
         5 . The peristaltic pump device according to  claim 1 , wherein
 a projecting amount of the tube from the tube holding groove is formed to be larger than an inner diameter of the tube.