Method to perform a measurement of an analyte in a sample using an automatic analyzer

An automatic analyzer for performing a measurement of an analyte in a sample, wherein the automatic analyzer comprises:

• a cartridge for dispensing a fluid,
• a measurement unit for performing the measurement,
• a sample holder for receiving the sample,
• a pump for pumping the fluid out of the cartridge to the sample holder,
• a memory for storing machine executable instructions, and
• a processor for controlling the automatic analyzer;
• wherein the cartridge comprises:
• a rigid portion,
• a flexible bladder, and
• an outlet;
• wherein the outlet is attached to the rigid portion;
• wherein the rigid portion comprises an inner cavity;
• wherein the outlet is connected to the inner cavity;
• wherein the rigid portion comprises an opening;
• wherein the opening is connected to the inner cavity;
• wherein the flexible bladder seals the opening to form a fluid chamber from the inner cavity;
• wherein the fluid chamber is at least partially filled with the fluid;
• wherein the pump is connected to the outlet;
• and wherein execution of the instructions causes the processor to:
• control the pump to pump the fluid from the cartridge to the sample holder;
• and
• control the measurement unit to perform the measurement of the analyte.

A cartridge assembly, wherein the cartridge assembly comprises:

• a cartridge for dispensing a fluid through an outlet, and
• a pump for pumping the fluid in the cartridge through the outlet;
• wherein the cartridge comprises:
• a rigid portion, and
• a flexible bladder;
• wherein the outlet is attached to the rigid portion;
• wherein the rigid portion comprises an inner cavity;
• wherein the outlet is connected to the inner cavity;
• wherein the rigid portion comprises an opening;
• wherein the opening is connected to the inner cavity;
• wherein the flexible bladder seals the opening to form a fluid chamber from the inner cavity;
• wherein the pump is connected to the outlet;
• wherein when the fluid chamber is filled with the fluid the flexible bladder is configured to expand out of the inner cavity to form a bladder volume;
• and wherein the bladder volume is defined by the opening and the flexible bladder.