Prosthesis for bodily canal

Claim 1

A prosthesis intended to be introduced into a bodily canal having a passage cross section, said prosthesis comprising: a flexible tube intended to preserve said passage cross section of the bodily canal, a holding device intended to immobilize said tube in position in said canal, said holding device being connected to one end of said tube by linkage means, while being arranged at a distance from said end, said holding device being radially deformable and being able to pass from a first cross section which is at most equal to said passage cross section, to a second cross section which is such that said holding device bears on a wall of an orifice of the bodily canal emerging in a natural cavity, and said holding device being a tubular helical spring made of turns at least substantially contiguous, said tubular helical spring having a length of several millimeters, said helical spring having a cross section of oblong shape, a short dimension of the oblong cross section of the said tubular helical spring being at most equal to said passage cross section, and a long dimension of the oblong cross section of said tubular helical spring being greater than the said passage cross section.