An artificial urinary sphincter system (200) includes a cuff (202) implantable around a portion of a urethra, an implantable pressure-regulating reservoir (204), and a deflation assembly (28) attachable between the cuff and the implantable pressure-regulating reservoir. The deflation assembly includes a valve that selectively restricts movement of the fluid from the cuff to the pressure-regulating reservoir, a base and an activation surface opposite the base. The activation surface includes an outer peripheral rim surrounding a pad that is movable to displace the valve to allow the fluid to flow from the cuff to the pressure-regulating reservoir. An entirety of the pad is recessed relative to the outer peripheral rim such that the outer peripheral rim defines a maxima of the activation surface.
