Patent ID: 8246321
Filing Date: 2012-08-21
Classification: A61M,F04B

Abstract:
1. A micropump comprising: a tube unit including a tube which has elasticity, and one portion of which is disposed in an arc shape, a plurality of fingers, which are disposed radiating from a direction of a center of the arc shape of the tube, and a guide frame, which holds the tube and the plurality of fingers; and a control unit including a cam, which sequentially presses the plurality of fingers in a direction in which a liquid flows, a drive force transmission mechanism, which transmits a torque to the cam, and a control circuitry, which carries out a control of a motor which drives the drive force transmission mechanism, wherein the tube unit and the control unit are attached stacked one on the other, and are detachable, the cam includes an outer circumferential surface, which is approximately perpendicular to a rotation plane of the cam, and has concavities and convexities which cause the plurality of fingers to press or release the tube, and a slope or a curved surface, which is continuous with the outer circumferential surface from a surface facing the tube unit, and when the tube unit is attached to the control unit, cam abutment portions of the plurality of fingers are moved to a position, in which they abut against the outer circumferential surface, along the slope or curved surface.