Device for extracorporeal blood treatment with gravimetric balancing and possibility of ultrafiltration

A device for extracorporeal blood treatment comprising:

• an internal fluidic system to which a blood treatment unit can be connected, wherein the internal fluidic system comprises:
• a first balancing chamber and a second balancing chamber on a fresh flow side for balancing fresh treatment fluid flowing to the blood treatment unit;
• and
• a third balancing chamber and a fourth balancing chamber on a used flow side for balancing used treatment fluid flowing off the blood treatment unit,
• at least one measuring device for gravimetric detection of treatment fluid in at least one of the first and second balancing chambers on the fresh flow side, and
• at least one measuring device for gravimetric detection of treatment fluid in at least one of the third and fourth balancing chambers on the used flow side;
• wherein at least one of the balancing chambers has a ventilation opening having a filter unit.

A device for extracorporeal blood treatment comprising:

• an internal fluidic system to which a blood treatment unit can be connected, wherein the internal fluidic system comprises:
• a first balancing chamber and a second balancing chamber on a fresh flow side for balancing fresh treatment fluid flowing to the blood treatment unit;
• and
• a third balancing chamber and a fourth balancing chamber on a used flow side for balancing used treatment fluid flowing off the blood treatment unit,
• at least one measuring device for gravimetric detection of treatment fluid in at least one of the first and second balancing chambers on the fresh flow side, and
• at least one measuring device for gravimetric detection of treatment fluid in at least one of the third and fourth balancing chambers on the used flow side;
• wherein each balancing chamber is configured as a piston-cylinder unit with a cylinder and a piston cooperating with the cylinder and accommodated therein.