A catheter (1) comprises a shaft (2) extending from a proximal end (3) to a distal end (4) and a sheath (5) which extends along the length of the catheter shaft. The sheath (5) comprises a compliant material and is expansile for fluid delivery from a distal end (6) of the sheath (5) to the proximal end (3) of the catheter. The expandable tubular sheath (5) lies flush to, and concentric with, the outer surface of a catheter shaft (2) during delivery and retrieval from the body. The catheter may be advanced over a guide wire (10) in either an over the wire or a rapid exchange configuration. The sheath (5) is connected to a Luer (20) on the proximal end of the catheter. The Luer connection (20) is utilised to provide independent access to the sheath lumen. Upon injection of fluid/particles through the Luer (20), the sheath expands to provide a temporary lumen (12) which facilitates flow of fluid/particles from the proximal end (3) of the catheter to an opening (15) or opening (15) adjacent to the distal end (6) of the sheath (5) and at or near the distal end (4) of the catheter shaft (2) for delivery of the fluid/particles into the vessel. Upon cessation of injection pressure, the sheath (5) automatically contracts to provide a lower profile to easily accommodate repositioning/removal of the catheter. On contraction of the sheath (5), the temporary lumen (12) is no longer provided.La présente invention concerne un cathéter (1) comprenant une tige (2) sétendant dune extrémité proximale (3) à une extrémité distale (4) et une gaine (5) qui sétend le long de la tige de cathéter. Selon linvention, la gaine (5) est constituée dun matériau déformable et est extensible pour permettre un apport de fluide dune extrémité distale (6) de la gaine (5) à lextrémité proximale (3) du cathéter. La gaine tubulaire extensible (5) est à fleur de la surface extérieure de la tige (2) du cathéter, et concentrique à cette dernière, lors de sa mise en place sur le corps et de son retrait du cor
