Cooling sleeve and optical fiber catheter having same

An optical fiber catheter comprising:

• a cooling sleeve;
• and
• a water-tight assembly arranged on the outer periphery of the cooling sleeve, the water-tight assembly comprising:
• a pipe body, whose connection port is provided with a first connection part;
• and the pipe body further has a branch tube connected externally;
• a tubular connector, which has a second connection part;
• and
• the tubular connector is fixedly connected to the pipe body through the second connection part and the first connection part;
• and
• wherein the cooling sleeve comprises:
• an inner tube, within which a bar-shaped or tubular object is placed to be cooled, wherein the outer wall surface of the bar-shaped or tubular object contacts with the inner wall surface of the inner tube to form several first contact portions extending in an axial direction, and axial gaps from the adjacent first contact portions form first circulation channels;
• an outer tube, within which the inner tube is located, wherein the inner wall surface of the outer tube contacts with the outer wall surface of the inner tube to form several second contact portions extending in the axial direction, and axial gaps from the adjacent second contact portions form second circulation channels,
• wherein proximal ends of the first circulation channels and proximal ends of the second circulation channels are connected with each other inside the proximal end of the outer tube via a forming cavity, and distal ends of the first circulation channels and distal ends of the second circulation channels are independently connected externally.