Deaerating arrangement for dialyzer

Claim 1

A deaerating arrangement for deaerating dialysis liquid in dialysis equipment of the type comprising a dialysis liquid feed line leading to a dialysis device and a dialysis liquid take-off line leading from the dialysis device, wherein the deaerating arrangement comprises a pair of deaerating chambers provided in series in the dialysis liquid feed line, the dialysis liquid outlet of the deaerating chamber first in series then leading to the dialysis liquid inlet of the deaerating chamber second in series, a feed back line leading from the head of the deaerating chamber second in series back to the base end of the deaerating chamber first in series through a first liquid flow-rate restrictor then being provided a deaerating line which leads off from the head of the deaerating chamber first in series through a second liquid flow-rate restrictor to an evacuation pump which, in operation, creates a negative pressure in the deaerating chamber first in series and withdraws air or gas formed in said first in series deaerating chamber, whereby the negative pressure created in the deaerating chamber first in series is transferred to the deaerating chamber second in series and whereby air or gas formed in the deaerating chamber second in series is withdrawn into the deaerating chamber first in series, the deaerating chamber further comprising a cylindrical housing having a base end into and from which the dialysis liquid inlet and dialysis liquid outlet pass and having a head end from which the deaerating line leads, a cylindrical divider chamber dividing said dialysis liquid inlet from said dialysis liquid outlet mounted inside the cylindrical housing on said base end over said dialysis liquid outlet and terminating short of said head end, and a foraminous mass located in the volume defined between the cylindrical housing and the cylindrical divider chamber to encourage bubble formation under the negative pressure created by the evacuation pump as dialysis liquid passes through the dialysis liquid inlet into the deaerating chamber upwardly through the foraminous mass and then downwardly in the cylindrical divider chamber to the dialyser liquid outlet.