Infusion pump cassette and infusion pump

Abstract

The present invention is related to an infusion pump cassette to deliver fluids with a tube and the like, and obtains a configuration for switching between a free flow state and a lock state in a simple manner by using components which are originally required for liquid infusion. There are provided a ring 13 that is installed in a position between the ring 13 and an inner wall surface 121 across a tube 20 in an inner space 120 and is movable in a radius direction extending radially from an axis; and an eccentric pin 15 that is movable to an infusion position (A) and a release position (B) which are different in a direction of the axis, that has an eccentric shape in which, when being at the infusion position (A), the eccentric pin 15 presses the ring 13 from an inside of a ring thereof in a direction of the radius direction so as to press the tube 20 against the inner wall surface 121 by the ring 13 to squeeze the tube 20, and when being at the release position (B), the eccentric pin 15 releases the ring 13 from the pressing so as to release the tube 20 from the squeezing, and that, when being at the infusion position (A), receives a rotation drive force from a motor to rotate about the axis so as to send a fluid in the tube 20 out via the ring 13.

1 . An infusion pump cassette comprising:
 a main body member that is defined by an inner wall surface which encircles an axis to spread, and that forms an inner space which receives a tube extending from an outside to arrange the tube along the inner wall surface and causes the tube to extend to the outside;   a ring-shaped member that is installed in a position between the ring-shaped member and the inner wall surface across the tube in the inner space, and that is movable in a radius direction extending radially from the axis; and   an eccentric member that is movable to an infusion position and a release position which are different in a direction of the axis, that has an eccentric shape in which, when being at the infusion position, the eccentric member presses the ring-shaped member from an inside of a ring thereof in a direction of the radius direction so as to press the tube against the inner wall surface by the ring-shaped member to squeeze the tube, and when being at the release position, the eccentric member loosens the pressing for the ring-shaped member or releases the ring-shaped member from the pressing so as to loosen the squeezing for the tube or release the tube from the squeezing, and that, when being at the infusion position, receives a rotation drive force from a motor to rotate about the axis so as to send a fluid in the tube out via the ring-shaped member.   
     
     
         2 . The infusion pump cassette according to  claim 1 , further comprising a fixing mechanism that fixes the eccentric member at the infusion position in a releasable manner. 
     
     
         3 . The infusion pump cassette according to  claim 2 , wherein the fixing mechanism includes a lock section that fixes the eccentric member being at the infusion position at the infusion position, and that, when a force of a predetermined value or more in a direction toward the release position is applied, releases the fixing so as to allow the eccentric member to go toward the release position. 
     
     
         4 . The infusion pump cassette according to  claim 2 , wherein the fixing mechanism includes a lock member that is movable between a lock position in which the lock member locks to the eccentric member being at the infusion position to cause the eccentric member to be immovable from the infusion position and a retraction position in which the lock member retracts from the lock position to make it possible for the eccentric member to move to the release position. 
     
     
         5 . The infusion pump cassette according to  claim 1 , wherein the inner wall surface of the main body member is an inner wall surface including an uneven surface in which plural ridgelines being arranged in a direction encircling the axis and in a same distance from the axis and plural depressed sections being depressed in directions more away from the axis than the ridgelines are alternately arranged. 
     
     
         6 . The infusion pump cassette according to  claim 5 , wherein the eccentric member causes, when being at the infusion position, the ring-shaped member to press the tube being received in the inner space against adjacent plural ridgelines of the uneven surface so as to sandwich the tube between the ring-shaped member and each of the plural ridgelines across the tube to squeeze the tube, and receives a rotation drive force from a motor to cause a ridgeline against which the tube is pressed to be sequentially taken over by a next ridgeline neighboring in the direction encircling the axis so as to send the fluid in the tube out. 
     
     
         7 . The infusion pump cassette according to  claim 5 , wherein the main body member includes plural slits which are formed separately with spaces in the direction encircling the axis and each of which penetrates from the inner wall surface to an external wall surface. 
     
     
         8 . An infusion pump comprising:
 an infusion pump cassette according to  claim 1 ; and   a pump main body that includes a motor therein, and receives an attachment of the infusion pump cassette to transfer a rotation drive force from the motor to the eccentric member being at the infusion position.