Protection and accommodation system (10; 110), in particular for a device for delivering a treatment to a patient, said system comprising: - a support structure arranged to be attached in a removable manner to the patient's body and defining a pocket which forms a cavity arranged to accommodate at least one part of said device, said support structure being of a multi-layer type and including a first inner sheet and a second outer sheet overlapping one on the other and connected to each other in a segment of the respective peripheral portions so as to form said pocket which is located at the space between them, said first and second sheet being made of a flexible material, and - a retaining structure (14; 114) associated with said support structure and arranged to be coupled with a fixing portion of said delivery device so as to prevent a relative movement of said fixing portion; said support structure being arranged, in use, for assuming a cover arrangement wherein it is superposed on - and covers - said retaining structure (14; 114), and a release arrangement wherein it allows to reach said retaining structure (14; 114), wherein a portion of the outer sheet defines a cover flap oscillatable so as to cover the retaining structure when the support structure is in the cover arrangement, said cover flap being further oscillatable so as to allow to reach said retaining structure when the support structure is in the release arrangement, characterised in that a portion of the outer sheet projecting laterally beyond the inner sheet defines the cover flap, and in that the periphery of the inner face of outer sheet is provided with a self-adhesive portion whereby said cover flap is attachable in a removable manner to the patient's body when said support structure is in the cover arrangement, wherein in said cover arrangement the cover flap is covering a part of the patient's body while also covering the retaining structure, and the cover flap is folded against the outer face of the outer sheet, while uncovering the part formerly covered of the patient's body and while uncovering the retaining structure, when the support structure is in the release arrangement. - a support structure arranged to be attached in a removable manner to the patient's body and defining a pocket which forms a cavity arranged to accommodate at least one part of said device, said support structure being of a multi-layer type and including a first inner sheet and a second outer sheet overlapping one on the other and connected to each other in a segment of the respective peripheral portions so as to form said pocket which is located at the space between them, said first and second sheet being made of a flexible material, and - a retaining structure (14; 114) associated with said support structure and arranged to be coupled with a fixing portion of said delivery device so as to prevent a relative movement of said fixing portion; said support structure being arranged, in use, for assuming a cover arrangement wherein it is superposed on - and covers - said retaining structure (14; 114), and a release arrangement wherein it allows to reach said retaining structure (14; 114), wherein a portion of the outer sheet defines a cover flap oscillatable so as to cover the retaining structure when the support structure is in the cover arrangement, said cover flap being further oscillatable so as to allow to reach said retaining structure when the support structure is in the release arrangement, characterised in that a portion of the outer sheet projecting laterally beyond the inner sheet defines the cover flap, and in that the periphery of the inner face of outer sheet is provided with a self-adhesive portion whereby said cover flap is attachable in a removable manner to the patient's body when said support structure is in the cover arrangement, wherein in said cover arrangement the cover flap is covering a part of the patient's body while also covering the retaining structure, and the cover flap is folded against the outer face of the outer sheet, while uncovering the part formerly covered of the patient's body and while uncovering the retaining structure, when the support structure is in the release arrangement. said support structure being arranged, in use, for assuming a cover arrangement wherein it is superposed on - and covers - said retaining structure (14; 114), and a release arrangement wherein it allows to reach said retaining structure (14; 114), wherein a portion of the outer sheet defines a cover flap oscillatable so as to cover the retaining structure when the support structure is in the cover arrangement, said cover flap being further oscillatable so as to allow to reach said retaining structure when the support structure is in the release arrangement, characterised in that a portion of the outer sheet projecting laterally beyond the inner sheet defines the cover flap, and in that the periphery of the inner face of outer sheet is provided with a self-adhesive portion whereby said cover flap is attachable in a removable manner to the patient's body when said support structure is in the cover arrangement, wherein in said cover arrangement the cover flap is covering a part of the patient's body while also covering the retaining structure, and the cover flap is folded against the outer face of the outer sheet, while uncovering the part formerly covered of the patient's body and while uncovering the retaining structure, when the support structure is in the release arrangement.