| 主权项 |
1. An intragastric balloon comprising:
an initial fill gas, wherein the initial fill gas consists essentially of one or more gases selected from the group consisting of SF6, C2F6, C3F8, C4F10, C3F6, CF4, and C(ClF2)—CF3; a valve system configured for introducing the initial fill gas into the balloon in vivo; and a polymeric wall comprising one or more layers, wherein the polymeric wall is configured to have, under in vivo conditions, a permeability to CO2 of more than 10 cc/m2/day, and wherein the polymeric wall is configured such that, in vivo, the balloon is configured to gain in volume and in pressure during a useful life of the intragastric balloon when filled with the initial fill gas, wherein the intragastric balloon when inflated with the initial fill gas is ellipsoid with a nominal radius of from 2.5 cm to 7.6 cm, a nominal height of from 0.6 cm to 7.6 cm, a volume of from 90 cm3 to 350 cm3 at 37° C., an internal nominal pressure at 37° C. of 0 Pa to 103421 Pa, and a weight of less than 15 g. |
