The invention provides a device for secure support, storage and/or transport of a tissue graft or an implant, which allows for precise microscopic investigation and/or evaluation and quality control of the tissue graft or implant during processing as well as prior to introduction into a living body. The main body of the device is a cannula or a cartridge comprising rectangular shape, preferably with rounded edges, having two opposite openings of different sizes and shapes. The first opening has a round shape with a diameter suitable for connection to a tube or a syringe nozzle. The second opening has an elliptical, round, biconvex or rectangle shape, in the latter case preferably with rounded edges that is small enough to be inserted into a small surgical incision. The transparency and preferably rounded, rectangular shape of the main body of the device permits microscopic examination of the tissue graft or implant within the device, as well as secures the tissue graft or implant position during delivery and implantation. The elliptical, round, biconvex or preferably rounded rectangle inner shape of the second opening ensures the correct positioning of the tissue graft or implant during surgical implantation, thereby preventing issues such as loss of the tissue graft or implant orientation. The invention further provides assemblies for loading, storing and/or transporting a tissue graft or implant comprising the device according to the invention. The invention further provides a washing assembly and a method for preparing a tissue graft or implant.La présente invention concerne un dispositif pour le support, le stockage et/ou le transport sûrs d'un greffon de tissu ou d'un implant, qui permet une investigation microscopique et/ou une évaluation et un contrôle de qualité précis du greffon de tissu ou de l'implant pendant le traitement ainsi qu'avant l'introduction dans un corps vivant. Le corps principal du dispositif est une canule ou une cartouche comprenant une fo
