The field of the invention is site-specific drug delivery capsules (SSDC's).
The disclosure relates to a closure member (14) for a substance reservoir
(12) of an SSDC (10). The SSDC (10) includes a retainer that
provides a non-linear force resisting opening of the closure member (14).
The non-linear force ensures that the closure member (14) unseals the reservoir
(12) only when an opening force exceeds a maximal value of the resisting
force, thereby preventing premature or accidental emptying of the reservoir (12).
The preferred means of providing the resistive force is a rolling, elastomeric
o-ring (64) that additionally seals the closure member (14) into
an aperture (13).
