Abstract: A capsule device (10) suitable for swallowing into a lumen of an intestinal tract of a patient comprises a housing section (12), a delivery outlet (20) for jet injection by a delivery assembly (22), an expansion assembly (26) and an expansion control mechanism (30). The expansion section (28) is arranged laterally opposite to and physically separated from the delivery outlet (20). An expansion section (28) of the expansion assembly (26) is laterally expandable from a non-expanded configuration to an expanded configuration for positioning the delivery outlet (20) against the lumen wall (14). The expansion control mechanism (30) is configured to activate the expansion assembly (26) under a predetermined condition to permit change of the expansion section (28) from the non-expanded configuration to the expanded configuration.