Staggered-Weld Cushion Bladder for Leak-Resistant Pressure Relief

The bladder is divided into multiple cells by interior welds that create segmented compartments. This segmentation distributes mechanical stress from handle operations across multiple separate cells rather than concentrating it at seal locations, preventing leakage while maintaining ease of patient transfer operations.

The patent creates different structural qualities at different locations: the peripheral edges have continuous seals for structural integrity, while the interior has staggered welds that create localized stress distribution points. This local differentiation allows handles to be used during patient transfer without causing leakage at the seals.

The interior welds are positioned asymmetrically in a staggered pattern rather than in symmetric alignment. This asymmetric arrangement ensures that stress from patient weight and handling is distributed across different locations in the bladder, preventing stress concentration at any single seal location while maintaining effective pressure redistribution.

The patent transitions from a single-layer bladder design to a multi-cell three-dimensional structure with interior welds creating vertical and horizontal compartmentation. This dimensional complexity allows pressure to be redistributed across multiple planes and locations, reducing stress concentration at peripheral seals while improving overall pressure distribution.

Multiple cells are merged into a single continuous bladder structure formed from one piece of material with integrated interior welds. This merging approach achieves effective multi-cell pressure redistribution while avoiding the complexity of assembling separate components, as the cells are created through welding rather than assembly.

The interior welds serve multiple functions simultaneously: they create cell separations for pressure redistribution, provide structural reinforcement, and distribute mechanical stress. This multi-functionality reduces the need for additional components, thereby managing device complexity while achieving effective pressure redistribution.