US Patent 9980522 Self-locking cartridge

A fluid cartridge for a vaporizer includes an inner tubular member and an outer tubular member with a space in between for holding a fluid to be vaporized. The inner tubular member includes a first connector for interconnecting with a second connector formed internal to a mouthpiece. The inner tubular member further includes a locking member that interconnects with at least one groove formed in an interior of the mouthpiece and the locking member and groove are configured to inhibit disconnection of the first and second connectors.