Dual-ventricle pump cartridge, pump, and method of use in a wearable continuous renal replacement therapy device

Abstract

A dual channel pulsatile pump for use with a completely wearable renal replacement device is provided.

1 . A dual channel pulsatile pump comprising:
 a dual channel pump cartridge having a first channel and a second channel, each channel of said dual channel pump cartridge comprising:
 a peristaltic tube that is compressible, said peristaltic tube having an input end and an output end; 
 an input valve at the input end, said input valve comprising an input o-ring, an input ball that seats against said input o-ring to stop fluid back flow through said input valve and an input spring member that positions said input ball against said input o-ring when the peristaltic tube is being compressed, said input spring member allows said input ball to move away from said input o-ring and allow forward fluid flow through said input valve when said peristaltic tube is being allowed to decompress; and 
   an output valve at said output end, said output valve comprising an output o-ring, an output ball that seats against said output o-ring to stop fluid back flow through said output valve and an output spring member that positions said output ball against said output o-ring when the peristaltic tube is being decompressed, said output spring member allows said output ball to move away from said output o-ring and allow forward fluid flow through said output valve when said peristaltic tube is being compressed; and   a pump motor portion comprising first oscillating pushing member for compressing and decompressing said peristaltic tube in a first channel and a second oscillating pushing member for compressing and decompressing said peristaltic tube in a second channel, said dual channel pump cartridge being removably attachable to said pump motor portion.   
     
     
         2 . The dual channel pulsatile pump of  claim 1 , wherein said input spring member comprises:
 an outer ring having a first diameter;   an inner ring having a second diameter that is smaller than said first diameter; and   a least two and not more than three spokes extending radially from said inner ring to said outer ring; said inner ring being able to move laterally with respect to a plane extending perpendicular to an axis of said outer ring.   
     
     
         3 . The dual channel pulsatile pump of  claim 1 , wherein said a dual channel pump cartridge dimensions are less than 0.72 inches high, 3.82 inches long, and 1.7 inches wide wherein each measurement is plus or minus 50 percent. 
     
     
         4 . The dual channel pulsatile pump of  claim 1 , wherein the dual channel pulsatile pump has dimensions of 9.7×7.1×4.6 cm and a weight of less than 400 grams plus or minus 50%. 
     
     
         5 . The dual channel pulsatile pump of  claim 1 , wherein said input spring member comprises an outer ring having a first diameter;
 an inner ring having a second diameter that is smaller than said first diameter; and   a least two and not more than three spokes extending radially from said inner ring to said outer ring; said inner ring being able to move laterally with respect to a plane extending perpendicular to an axis of said outer ring, said inner ring providing stabilization to said ball when fluid is flowing through said input valve.