The mechanism (1) has a carrying structure with larger and smaller ratios from length to transverse extension along an axis in primary and secondary forms, respectively. The structure has a proximal section (10) and a distal section and is formed based on a type of a meshwork and/or tissue and/or mass of eggs and/or net. The distal section in the secondary form has a partial piece (14) path-breaking outwards by the section (10) and another partial piece folded back on the piece (14) in the direction to the section (10) from the primary form into the secondary form. Independent claims are also included for the following: (1) a method for closing an implantable mechanism in an implantation position in a human or animal body using a closing system (2) a method for unfolding the implantable mechanism.
