Self-contained perfusion device

Abstract

The invention concerns a self-contained perfusion device comprising means for fixing an infusion bag under pressure between a fixed plate and a mobile plate driven by an elastic mechanism, the lower plate ( 8 ) is fixed in the vertical direction, while the upper plate ( 14 ) is mobile in the vertical direction under the action of the elastic mechanism ( 15 ). At least one opening ( 7 ) is provided in at least a side wall ( 5 ) of the device for inserting an infusion bag ( 9 ) between the two plates ( 8, 14 ). The elastic mechanism ( 15 ) is provided with independent means for controlling and locking the plates ( 8, 14 ), and means ( 24, 25 ) are provided for unlocking the elastic mechanism ( 15 ) after the infusion bag ( 9 ) has been loaded. The lower plate ( 8 ) can be horizontally mobile like a slide. Means are further provided for controlling the emptying of the bag during perfusion.

1 . Self-contained infusion device which comprises means for bringing an infusion bag under pressure between a fixed plate and a movable plate driven by an elastic mechanism, characterized in that the lower plate ( 8 ) is fixed in the vertical direction, in that the upper plate ( 14 ) is movable in the vertical direction under the action of said elastic mechanism ( 15 ), in that at least one opening ( 7 ) is provided in at least one side wall ( 5 ) of the device for the purpose of introducing an infusion bag ( 9 ) between said two plates ( 8 ,  14 ), in that said elastic mechanism ( 15 ) is provided with independent means for controlling and locking said plates ( 8 ,  14 ), and in that means ( 24 ,  25 ) are provided for unlocking said elastic mechanism ( 15 ) after said infusion bag has been loaded.  
     
     
         2 . Device according to  claim 1 , characterized in that said lower plate ( 8 ) is movable in its plane, in the manner of a drawer, between an internal working and rest position and an external loading position.  
     
     
         3 . Device according to either one of claims  1  and  2 , characterized in that said unlocking means are actuated by said lower plate ( 8 ) during its return travel towards its internal position.  
     
     
         4 . Device according to any one of the preceding claims, characterized in that the means for controlling said elastic mechanism ( 15 ) comprise a kinematic chain connecting a point of application of the priming force to a member for tensioning the springs.  
     
     
         5 . Device according to any one of the preceding claims, characterized in that it comprises means for monitoring the degree of emptying of the bag during the infusion.  
     
     
         6 . Device according to  claim 5 , characterized in that said monitoring means comprise at least one graduated window, optionally arranged in a vertical panel ( 5 ) of the device and extending by a height at least equal to the maximum distance h.  
     
     
         7 . Device according to any one of the preceding claims, characterized in that the springs ( 20 ,  21 ) have a stiffness which, combined with suitable dimensioning of the elastic mechanism ( 15 ), leads to an increase in the pressure force F P  as a function of the decrease in the distance h, at least substantially equal to the increase in the contact surface S, also as a function of the decrease in this distance h.  
     
     
         8 . Device according to  claim 7 , characterized in that the springs ( 20 ,  21 ) have a wire diameter and/or a number of spirals and/or a diameter of the spirals which are determined in such a way as to ensure the pressure force required as a function of the size of the bag.