Biological component collection system and flow path internal pressure acquisition method

A biological component collection system comprising

• a separation device adapted to separate a biological component from a biological liquid, and having at least a collection and returning pump,
• a biological component collection device configured to be attachable to the separation device and having
• a biological liquid line formed therein through which the biological liquid or the biological component flows,
• the biological component collection system further comprising means for performing a plurality of times a cycle including a collection operation for collecting a desired biological component in the biological liquid by allowing the biological liquid to flow from a donor through the biological liquid line to the separation device under an action of the collection and returning pump, and a returning operation for returning remaining biological components to the donor from the separation device through the biological liquid line under the action of the collection and returning pump;
• wherein the collection and returning pump is temporarily stopped in at least one of during the collection operation and during the returning operation of the first cycle.

A flow path internal pressure acquisition method in which there is used a biological component collection system equipped with a separation device having a first load detecting unit and a second load detecting unit and adapted to separate a biological component from a biological liquid, a biological component collection device configured to be attachable to the separation device and having a biological liquid line formed therein through which the biological liquid or the biological component flows, and a collection and returning pump, the method comprising

• performing a plurality of times a cycle including a collection operation for
• collecting a desired biological component in the biological liquid by allowing the biological liquid to flow from a donor through the biological liquid line to the separation device under an action of the collection and returning pump, and
• a returning operation for returning remaining biological components to the donor from the separation device through the biological liquid line under the action of the collection and returning pump;
• measuring a first load through a soft wall of the biological component collection device at a first wall portion;
• and
• measuring a second load through said soft wall at a second wall portion;
• the flow path internal pressure acquisition method further comprising:
• a collection and returning determination step of determining whether or not it is during a collection operation or during a returning operation of a first cycle;
• and
• a calibration step of performing calibration of first internal pressure calculation data, for a case in which, in the collection and returning determination step, it is determined that it is during the collection operation or during the returning operation of the first cycle;
• and in the calibration step, there are performed:
• a pump stopping step of stopping the collection and returning pump;
• a first internal pressure calculation step of calculating a first internal pressure said first measured load and first internal pressure calculation data in a state in which the collection and returning pump is stopped;
• a second internal pressure calculation step of calculating a second internal pressure on the basis of said second measured load and second internal pressure calculation data in a state in which the collection and returning pump is stopped;
• and
• a correction step of correcting the first internal pressure calculation data in a manner so that the first internal pressure calculated by the first internal pressure calculation step becomes equal to the second internal pressure calculated by the second internal pressure calculation step.