The present invention relates to a set comprising at least one expandable and/or decollapsible or unfoldable medical implant wherein at least one implantation device is configured for detachably receiving the implant or a device comprising at least the implant (3), wherein the implant may comprise at least a valve, wherein the valve may configured so as to fulfill a check valve function with one conducting direction (CD) and one blocking direction (BD), in which a blocking element may move for opening and/or closing the valve (50), wherein the valve may be arranged on the implantation device or on the device with at least one conducting side being located at a smaller distance from the distal end or from the distal tip of the implantation device than one blocking side. The present invention further relate to a method of detachably attaching an implant or a device comprising the implant with an implantation device and to a method for releasing an implant from an implantation device and/or from a device comprising the implant.
