Method and installation for testing the integrity of a capillary dialyzer

An equipment for checking the integrity of a hollow-fibre fluid filter, which is constructed from a plurality of hollow fibres enclosed by a membrane, comprising:

• a flushing system which is set up to channel a fluid through the interior of the hollow fibres of the hollow-fibre fluid filter to be checked and
• a gas pressure system which is set up to supply the exterior of the hollow fibres of the hollow-fibre fluid filter to be checked with a gas, or
• the flushing system which is set up to channel the fluid through the exterior of the hollow fibres of the hollow-fibre fluid filter to be checked and
• the gas pressure system which is set up to supply the interior of the hollow fibres of the hollow-fibre fluid filter to be checked with the gas,
• wherein in each case the pressure of the gas is higher than the pressure of the fluid, and
• a measuring device for the determination of a quantity of the gas penetrating into the fluid through holes in the membrane during a predefined or predefinable reference period,
• wherein
• the flushing system comprises a bubble trap arranged downstream of the hollow-fibre fluid filter, and
• in that the measuring device is set up to determine a volume of the gas collecting in the bubble trap during the predefined or predefinable reference period.