Pumping material for cassette based dialysis and pumping mechanism using same

Abstract

A fluid pumping mechanism in one embodiment includes a fluid reservoir, and a multiple layer film extending over a portion of the fluid reservoir, wherein fluid is moved through the reservoir by movement of the film from a first position to a second position, the film including first and second layers, each of first and second layers comprising a blend of a polypropylene and a styrene ethylene butadiene block copolymer. Peritoneal dialysis systems are also provided and may include a peritoneal dialysis machine and a disposable cassette defining at least one pump chamber and having a multiple layer film extending over a portion of the at least one pump chamber, the film including first and second layers, each of the first and second layers comprising a blend of a polypropylene and a styrene ethylene butadiene block copolymer.

1 . A fluid pumping mechanism comprising:
 a fluid reservoir; and   a multiple layer film extending over a portion of the fluid reservoir, wherein fluid is moved through the reservoir by movement of the film from a first position to a second position, the film including first and second layers, each of the first and second layers comprising a blend of a polypropylene and a styrene ethylene butadiene block copolymer.   
     
     
         2 . The mechanism of  claim 1 , wherein the fluid reservoir is defined by a frame and the film is attached to the frame. 
     
     
         3 . The mechanism of  claim 2 , wherein the film is attached to the frame by heat sealing. 
     
     
         4 . The mechanism of  claim 2 , wherein the film is attached to the frame by welding. 
     
     
         5 . The mechanism of  claim 2 , wherein the frame is manufactured from polypropylene. 
     
     
         6 . The mechanism of  claim 1 , further comprising a tubing in fluid communication with the reservoir. 
     
     
         7 . The mechanism of  claim 6 , wherein the reservoir is defined by a frame and the tubing is connected to the frame by solvent bonding. 
     
     
         8 . The mechanism of  claim 1 , which is used in a therapy selected from the group consisting of continuous flow peritoneal dialysis, automated peritoneal dialysis, tidal flow peritoneal dialysis, hemofiltration and hemodialysis. 
     
     
         9 . A peritoneal dialysis system comprising:
 a peritoneal dialysis machine; and   a disposable cassette defining at least one pump chamber and having a multiple layer film extending over a portion of the at least one pump chamber, the peritoneal dialysis machine constructed and arranged to move a fluid through the at least one pump chamber by movement of the film from a first position to a second position, the film including first and second layers, each of the first and second layers comprising a blend of a polypropylene and a styrene ethylene butadiene block copolymer.   
     
     
         10 . The peritoneal dialysis system of  claim 9 , wherein the fluid reservoir is defined by a frame and the film is attached to the frame. 
     
     
         11 . The peritoneal dialysis system of  claim 10 , wherein the film is attached to the frame by heat sealing. 
     
     
         12 . The peritoneal dialysis system of  claim 10 , wherein the film is attached to the frame by welding. 
     
     
         13 . The peritoneal dialysis system of  claim 10 , wherein the frame is manufactured from polypropylene. 
     
     
         14 . The peritoneal dialysis system of  claim 9 , further comprising a tubing in fluid communication with the reservoir. 
     
     
         15 . The peritoneal dialysis system of  claim 14 , wherein the reservoir is defined by a frame and the tubing is connected to the frame by solvent bonding. 
     
     
         16 . The peritoneal dialysis system of  claim 9 , which is used in a therapy selected from the group consisting of continuous flow peritoneal dialysis, automated peritoneal dialysis, tidal flow peritoneal dialysis, hemofiltration and hemodialysis.