An intra-vascular dwelling balloon catheter for arterial perfusion, for use in operations for aortic aneurysm for example, comprises a flexible elongate basic body (2) having a balloon (6) attached to a tip section (5). An axial bore (10) with its front end closed and its rear end open is formed in the catheter body of the catheter to extend rearwardly of the balloon. One or more side holes (12) for perfusing blood are provided in the body near the rear end of the balloon, and a rod (14) is removably received in the said bore from the open rear end thereof so that the side hole is closed. Ribs (7) are provided on the external surface of the balloon.
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