The present invention comprises a connector (1) and a fluid supply system (100). The connector (1) is provided with: a tube (10) that can be placed within a vascular channel; a tubular body (30) having an inner wall surface that, in concert with the outer wall surface of the tube (10) placed within the vascular channel, is capable of sandwiching the vascular channel therebetween; and a balloon (20) that is disposed on the outer wall surface of the tube (10) or the inner wall surface of the tubular body (30) and is capable of expanding radially so that the inner wall surface of the tubular body (30) and the outer wall surface of the tube (10) create a seal with the vascular channel. The fluid supply system (100) may be provided with the connector (1) and a perfusion fluid supply device (120) that is connected to the connector (1) and capable of supplying a perfusion fluid into a vascular channel.
