Infusion pump system of fluid for medical purposes

Abstract

The present invention relates to an infusion pump system of fluid which can keep supplying a regular quantity of the fluid to the patient regardless of the position of the reservoir by applying pressure upon the reservoir. The infusion pump system of fluid according to the present invention comprises a flexible reservoir containing the fluid therein; a chamber having a squeezer therein which is in tight contact with an outer surface of the reservoir to apply pressure on the reservoir and spaced from an inner wall of the chamber; a storage containing air therein to be supplied to a space between the inner wall of the chamber and the squeezer; and a pressurizing plate movable back and forth in the storage by driving force of a motor to supply the air in the storage to the space between the inner wall of the chamber and the squeezer.

1 . An infusion pump system of fluid comprising: 
 a flexible reservoir ( 10 ) containing the fluid therein;    a chamber ( 20 ) having a squeezer ( 21 ) therein which is in tight contact with an outer surface of the reservoir ( 10 ) to apply pressure on the reservoir ( 10 ) and spaced from an inner wall ( 22 ) of the chamber ( 20 );    a storage ( 30 ) containing fluid therein to be supplied to a space between the inner wall ( 22 ) of the chamber ( 20 ) and the squeezer ( 21 ); and    a pressurizing plate ( 50 ) movable back and forth in the storage ( 30 ) by driving force of a rotary motor ( 40 ) to supply the fluid in the storage ( 30 ) to the space between the inner wall ( 22 ) of the chamber ( 20 ) and the squeezer ( 21 ).    
   
   
       2 . The infusion pump system as claimed in  claim 1 , characterized in that a rack ( 51 ) is integrally formed with the pressurizing plate ( 50 ) on its one side to move back and forth in the storage ( 30 ) as a pinion ( 41 ) engaged with the rack ( 51 ) rotates back and forth by the driving force of the motor ( 40 ).  
   
   
       3 . The infusion pump system as claimed in  claim 1 , characterized in that air is filled in the storage ( 30 ) to be delivered from and to the space between the inner wall ( 22 ) of the chamber ( 20 ) and the squeezer ( 21 ) according to the direction to which the pressurizing plate ( 50 ) moves.