The device according to the invention includes a hollow body delimiting an inner passage. It further includes an assembly for maintaining the material in position in the inner passage.The maintaining assembly includes a radially compressible member delimiting, when idle, a through passage aperture of the material, and a radial compression member compressing the compressible member, radially movable relative to an axis of the passage aperture to outwardly compress the compressible member.It includes a member for actuating the or each compression member, radially movable relative to the body to cause the compression member to go from a radially retracted position, in which the section of the passage aperture is maximal, to a position radially deployed in the compressible member, in which the section of the passage aperture is minimal.
