Perfusion device, perfusion method, and perfusion system

A perfusion method, comprising:

• inserting a tube into a conduit of an insertion appliance configured to be inserted into a subject, the tube including a main part, a distal end part having a larger diameter than the main part, a first flow path formed in the tube, and a second flow path formed in the tube, the distal end part including a first opening at a side surface and a second opening at a distal end, the first flow path penetrating both the main part and the distal end part, the first flow path including a main path portion extending along a longitudinal axis, and the second flow path penetrating only the distal end part along the longitudinal axis and communicating with the second opening;
• causing the distal end part of the tube to protrude from a distal end of the conduit;
• performing one of feeding and suction of liquid from the first opening;
• and
• performing another of feeding and suction of the liquid through the second opening.

A perfusion system, comprising:

• an insertion appliance configured to be insertable inside a subject, the insertion appliance including a conduit disposed along a longitudinal axis;
• a tube configured to be insertable in the conduit, the tube including:
• a main part,
• a distal end part having a larger diameter than the main part,
• a first flow path formed in the tube, and
• a second flow path formed in the tube;
• a liquid supply source configured to supply liquid to the tube;
• and
• a fluid control device configured to control a supply flow rate of the liquid by the liquid supply source,
• wherein:
• the distal end part includes a first opening at a side surface and a second opening at a distal end,
• the first flow path penetrates both the main part and the distal end part, the first flow path including a main path portion extending along the longitudinal axis,
• the second flow path penetrates only the distal end part along the longitudinal axis and communicates with the second opening, and
• in a state where the distal end part protrudes from a distal end of the conduit, one of feeding and suction of liquid is allowed to be performed through the first opening of the tube, and another of feeding and suction of the liquid is allowed to be performed through the second opening.

A perfusion device, comprising:

• an insertion appliance including:
• an insertion section configured to be insertable inside a subject, the insertion section including a conduit disposed along a longitudinal axis,
• an operation section including a switch configured to switch between feeding and suction of liquid, and
• an external conduit which is provided outside the insertion section, the external conduit being made of a material that is extendable and contractible or that is deformable;
• and
• a tube configured to be insertable in the external conduit, the tube including an opening at a distal end part,
• wherein, in a state where the opening protrudes from a distal end of the external conduit, one of feeding and suction of the liquid is allowed to be performed through the opening of the tube in a manner switchable by the switch, and another of feeding and suction of the liquid is allowed to be performed through a gap between an outer circumferential surface of the tube and an inner circumferential surface of the external conduit.