Patent ID: 8815088
Filing Date: 2014-08-26
Classification: A61M,F04B

Abstract:
1. A dialysis fluid pump for pumping dialysis fluid from a dialysis fluid supply tank to a hemodialysis filter and in turn from the hemodialysis filter to a dialysis fluid recovery tank, the dialysis fluid pump comprising: a housing having an accommodating space therein; a dialysis fluid supply tube formed of a flexible material that can be contracted and relaxed, wherein at least a portion of the dialysis fluid supply tube is accommodated in the accommodating space, and one end of the dialysis fluid supply tube is connected to the dialysis fluid supply tank and the other end is connected to the hemodialysis filter; a dialysis fluid recovery tube formed of a flexible material that can be contracted and relaxed, wherein at least a portion of the dialysis fluid recovery tube is accommodated in the accommodating space, and one end of the dialysis fluid recovery tube is connected to the dialysis fluid recovery tank and the other end is connected to the hemodialysis filter; a cam rotatably installed in the accommodating space, wherein the cam has a cam surface for pressing the dialysis fluid supply tube and the dialysis fluid recovery tube to discharge the dialysis fluid from the inside of the dialysis fluid supply tube and of the dialysis fluid recovery tube, respectively; a motor for rotating the cam; a first backflow pressure preventer movably installed in the accommodating space so as to be pushed by the cam, wherein the first backflow pressure preventer includes a first pressure protrusion adapted to contract a first portion of the dialysis fluid supply tube accommodated in the accommodating space so as to prevent the dialysis fluid in the dialysis fluid supply tube from flowing backward to the dialysis fluid supply tank and a second pressure protrusion adapted to contract a first portion of the dialysis fluid recovery tube accommodated in the accommodating space so as to prevent the dialysis fluid in the dialysis fluid recovery tank from flowing backward to the dialysis fluid recovery tube; and a second backflow pressure preventer movably installed in the accommodating space so as to be pushed by the cam, wherein the second backflow pressure preventer includes a third pressure protrusion adapted to contract a second portion of the dialysis fluid supply tube accommodated in the accommodating space so as to prevent the dialysis fluid in the hemodialysis filter from flowing backward to the dialysis fluid supply tube and a fourth pressure protrusion adapted to contract a second portion of the dialysis fluid recovery tube accommodated in the accommodating space so as to prevent the dialysis fluid in the dialysis fluid recovery tube from flowing backward to the hemodialysis filter.