Placement device (10) for an inflatable gastric balloon (30) for the placement of the gastric balloon (30) in a stomach, the gastric balloon (30) having a deflated state and an inflated state, the placement device (10) comprising:
- an elastically deformable casing (11) delimiting a cavity (12) configured to receive the gastric balloon (30) in the deflated state, the casing (11) extending along a longitudinal axis (L) and comprising a lateral wall (13) extending around the longitudinal axis (L) between a connection end (14) and an insertion end (15),
- a duct (21) configured to be supplied with a fluid and to convey the fluid to inflate the gastric balloon (30), the duct (21) being attached to the connection end (14) of the casing (11), and comprising an end piece (22) configured to removably attach the gastric balloon (30),
- wherein
- the end piece (22) has an inflation position in which said end piece (22) extends into the cavity (12) of the casing (11),
- and the lateral wall (13) of the casing (11) has a lateral opening (16) configured to allow the gastric balloon (30) to exit the cavity (12) when said gastric balloon (30) passes from the deflated state to the inflated state.