A method of preparing an ostomy device (10) before adhering the ostomy device (10) to a patient, the steps comprise: providing an ostomy bag (12) that has (i) an interior space； (ii) a stomal opening (22) that communicates with the interior space； (iii) an opening that can be closed (36) other than the stomal opening (22), and which communicates with the interior space； and an adhesive support to the body (14) attached to the ostomy bag (12), the support to the body (14) having (i) an adhesive surface oriented towards the body (26) and (ii) a surface not oriented towards the body (28)； and the adhesive support to the body (14) which includes the adhesive (24) of which at least one region is moldable； characterized in that said method further comprises the steps of: accessing the moldable region (24a) of the adhesive (24), on the outwardly oriented side of the body, through the closing opening (36) of the bag of ostomy (12) other than the stomal opening (22) of the ostomy bag (12)； and molding an opening that receives the stoma in the moldable region (24a) of the adhesive (24) by manipulating the moldable region (24a) through the sealable opening (36) and inside the bag.Un método para preparar un dispositivo de ostomía (10) antes de adherir el dispositivo de ostomía (10) a un paciente, las etapas comprenden: proporcionar una bolsa de ostomía (12) que tiene (i) un espacio interior； (ii) una abertura estomal (22) que se comunica con el espacio interior； (iii) una abertura que puede cerrarse (36) distinta de la abertura estomal (22), y que se comunica con el espacio interior； y un soporte adhesivo al cuerpo (14) unido a la bolsa de ostomía (12), el soporte al cuerpo (14) que tiene (i) una superficie adhesiva orientada hacia el cuerpo (26) y (ii) una superficie no orientada hacia el cuerpo (28)； y el soporte adhesivo al cuerpo (14) que incluye el adhesivo (24) del cual es moldeable al menos una región； caracterizado porque dicho método comprende, además, las etapas de: a
