Abstract: A device suitable for implantation at a desired position in a lumen of a warm-blooded living being, which device comprises a tubular holder to be fixed in the lumen and at least one function element to be detachably fitted in the holder. The holder comprises a deformable tube which, in a first form thereof, is provided with slits, which holder can be made to expand in use from the first form to a second, expanded form once it has been implanted at the desired position in the lumen, with the slits forming mesh-shaped openings. The holder, in the expanded form thereof, further comprises a first portion having a reduced first diameter, in which the function element can be detachably fitted.