Blood component sampling cassette, blood sampling circuit set, and blood component sampling system

A biological component sampling circuit set comprising:

• a biological component sampling cassette including a cassette main body provided with a plurality of flow paths and configured to be attachable to a separation device configured to separate a biological component from liquid containing at least one biological component;
• a separation processing section connected to the biological component sampling cassette through a tube and having a processing chamber configured to separate the liquid into multiple biological components by actuation of the separation device;
• and
• a bag connected to the biological component sampling cassette through a tube,
• wherein the cassette main body is consists exclusively of a first sheet of a soft material to which heat sterilization is applicable and a second sheet of said soft material, said first and second sheet being bonded to each other to form said plurality of flow paths,
• the plurality of flow paths includes
• an introduction line configured to introduce the liquid,
• a biological component transfer line configured to transfer, to a sampling container, the biological component obtained by separation processing of the liquid, and
• a return line configured to transfer liquid other than the biological component obtained by the separation processing, wherein
• the return line is provided with a reservoir configured to temporarily store the liquid to be returned, and
• the reservoir is configured to selectively expand or contract, and is pressed by a return pump provided at the separation device to discharge the liquid from the reservoir.

A biological component sampling system comprising:

• a separation device configured to separate a biological component from liquid containing at least one biological component;
• and
• a biological component sampling cassette configured to be attachable to the separation device,
• wherein the biological component sampling cassette includes a cassette main body provided with a plurality of flow paths,
• wherein the cassette main body is consists exclusively of a first sheet of a soft material to which heat sterilization is applicable and a second sheet of said soft material, said first and second sheet being bonded to each other to form said plurality of flow paths,
• the plurality of flow paths includes
• an introduction line configured to introduce the liquid,
• a biological component transfer line configured to transfer, to a sampling container, the biological component obtained by separation processing of the liquid, and
• a return line configured to transfer liquid other than the biological component obtained by the separation processing, wherein
• the return line is provided with a reservoir configured to temporarily store the liquid to be returned, and
• the reservoir is configured to selectively expand or contract, and is pressed by a return pump provided at the separation device to discharge the liquid from the reservoir.