Re-use of a hemodialysis cartridge

1. A method of cleaning a dialysate mixing and flow balance cartridge for re-use in the hemodialysis machine, comprising:

a) providing the cartridge, the cartridge having a first mixing pump chamber, a second mixing pump chamber connected to the first mixing pump chamber, a first flow balance pump chamber connected to the second mixing pump chamber, a second flow balance pump chamber, at least one inlet and at least one outlet;

b) connecting a sanitisation device between the at least one inlet and the at least one outlet of the cartridge, the sanitisation device comprising a chemical cleaning receptacle that is external to the cartridge;

c) flowing a liquid through the cartridge and the sanitisation device in a first direction by actuation of at least one of the pump chambers on the cartridge;

d) flowing the liquid through the cartridge and the sanitisation device in a second direction by actuation of at least one of the pump chambers on the cartridge; and

e) flowing the liquid out of the cartridge through the at least one outlet; and

wherein the at least one inlet of the cartridge comprises a plurality of inlets, each one of a spent dialysate solution inlet, a water inlet, a bicarbonate inlet and an acid inlet being a respective one of the plurality of inlets; and

the at least one outlet comprises a plurality of outlets, each one of a drain port, a clean dialysate solution outlet, and a water outlet being a respective one of the plurality of outlets.

2. The method of cleaning the cartridge for re-use in the hemodialysis machine according to claim 1 , further comprising:

f) connecting the spent dialysate solution inlet to the clean dialysate solution outlet;

g) connecting the water outlet to the bicarbonate inlet;

h) disconnecting the drain port;

i) connecting the water inlet to a purified water supply;

j) after performing the steps f through i, flushing purified water through the cartridge and out of the drain port and the acid inlet;

k) then connecting the drain port to the acid inlet;

I) then performing the step b connecting step by connecting the sanitisation device between the spent dialysate solution inlet and the clean dialysate solution outlet;

m) after performing the step I and while performing the step c, measuring conductivity of the liquid in the cartridge when flowing in the first direction to confirm that the liquid in the cartridge is not purified water;

n) after performing the steps m and d, disconnecting the sanitisation device, re-connecting the spent dialysate solution inlet to the clean dialysate solution outlet, and disconnecting the drain port from the acid inlet;

o) then performing the step e flowing step by flushing purified water through the cartridge and out of the drain port and the acid inlet;

p) then measuring the conductivity of the liquid in the cartridge to confirm that the liquid in the cartridge is purified water;

q) then disconnecting all of the cartridge inlets and outlets; and

r) then connecting the cartridge to the hemodialysis machine.

3. The method of cleaning the cartridge for re-use in the hemodialysis machine according to claim 1 , further comprising:

f) performing the step b connecting step by connecting the spent dialysate solution inlet, the clean dialysate solution outlet, the bicarbonate inlet, the acid inlet and the water outlet to the sanitisation device;

g) connecting the water inlet to a purified water supply;

h) connecting the drain port to a drain;

i) after performing the steps f through h, flushing purified water through the cartridge and out of the drain port;

j) then performing the step c by flowing a chemical from the sanitization device;

k) after or while performing step j, measuring conductivity of the liquid in the cartridge to confirm that the liquid in the cartridge is not purified water;

I) after performing the step k, performing the step e flowing step by flushing purified water through the cartridge and out of the drain port;

m) then measuring the conductivity of the liquid in the cartridge to confirm that the liquid in the cartridge is purified water;

n) then disconnecting all of the cartridge inlets and outlets; and

o) then connecting the cartridge to the hemodialysis machine.

4. The method of cleaning the cartridge for re-use in the hemodialysis machine according to claim 1 , wherein the spent dialysate solution inlet, the clean dialysate solution outlet, the bicarbonate inlet, the acid inlet and the water outlet are connected to the sanitisation device via a common manifold, the manifold having a single fluid path to the sanitisation device.

5. The method of cleaning the cartridge for re-use in the hemodialysis machine according to claim 1 , wherein the spent dialysate solution inlet, the clean dialysate solution outlet, the bicarbonate inlet, the acid inlet and the water outlet each have a respective fluid path to the sanitisation device.