Patent ID: 11925741
Assignee: TERUMO KABUSHIKI KAISHA
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 14:
15. A circuit internal pressure acquisition method for measuring a circuit internal pressure of a biological component collection device attached to a separation device having a first load detector and a second load detector, the separation device being adapted to separate a biological component from a liquid containing at least one biological component;
wherein the biological component collection device comprises:
a cassette body comprising:
a flow path through which liquid flows, the flow path including a first branch and a second branch that is spaced apart from the first branch in a first direction on a surface of the cassette body;

a first port at a first end of the cassette body, wherein the liquid enters or exits the cassette body through the first port;
a first coupling member adjacent to the first port at the first end of the cassette body and that connects the first port, the first branch, and the second branch;
a second port at a second end of the cassette body opposite the first end, wherein the liquid enters or exits the cassette body through the second port;
a second coupling member adjacent to the second port at the second end of the cassette body and that connects the second port, the first branch, and the second branch, wherein the first branch and the second branch are spaced apart from one another along a length of the surface of the cassette body that corresponds to a distance between the first coupling member and the second coupling member;
a first soft portion in the first branch of the flow path, and which is pressable by the first load detector of the separation device; and
a second soft portion in the second branch of the flow path, wherein the second soft portion is more easily deformable than the first soft portion, and is pressable by the second load detector,

wherein the circuit internal pressure acquisition method comprises:
a data acquisition step of acquiring data for correcting reference data to be used when calculating the circuit internal pressure, by detecting with the second load detector a load received from the second soft portion in a state in which a pressurized fluid is introduced into the second branch of the flow path;
a correction step of correcting the reference data, using the data acquired by the second load detector; and
an internal pressure calculation step of calculating the circuit internal pressure of the biological component collection device, using the data acquired by the first load detector and the corrected reference data.