An apparatus comprises a housing and one or more deployable protrusions. The apparatus defines a fluid reservoir and presents an upper surface. The housing is sized and configured to be implanted within a patient. The protrusions are selectively movable from a first position to a second position. The protrusions are at least partially retracted relative to the housing when the protrusions are in the first position. The protrusions are at least partially extended relative to the housing when the protrusions are in the second position. The protrusions may be in the form of substantially cylindraceous posts, semi-circular members, or other shapes. The protrusions may be actuated mechanically, electromechanically, or otherwise. The apparatus may be provided as an injection port, as part of a gastric band system or otherwise. The deployed protrusions may facilitate location of the implanted port through external palpation of the patients abdomen.
