This invention discloses a Continuous Ambulatory Haemofiltration (CAHF) Device, consisting of an outer casing, a multifunction pump, a haemofilter, a reversed osmosis filter, a power source, a drainage bag, blood lines and fluid lines, characterizes in that the haemofiltrate from the haemolfilter is moved to a reversed osmosis filter. The ultrafiltrate fluid from the reversed osmosis filter flows to the out-flow tube of the haemofilter veineus line through a specific fluid line. The exit of the reversed osmosis filter is connected to a drainage bag. The role of the a multifunction pump is to move the blood from the jagular perm catherter to the haemofilter, and to move fluids between the haemofilter, reversed osmosis filter, veineus line and the drainage bag. An electrode is placed at the in-flow tube of the haemofilter to measure the incoming blood osmolality. The electrode is connected to a microprocessor that is further connected to a computer-controlled valve that is placed at the out-flow line of the reversed osmosis filter. The microprocessor is connected with a memory card. The device is much smaller than a conventional device, and can produce haemofiltration replacement solution itself. Using the device can decrease the agony and medical care cost of a patient to a great extent.
