Abstract: A nest and tub arrangement for the storage of medical device components including a tub having a plurality of guide elements extending from at least one surface of the tub and into the interior of the tub, and at least one nest having a plurality of receptacles for the storage of a plurality of medical device components therein. The at least one nest is sized and configured for placement within the tub such that the plurality of guide elements align and removably retain the at least one nest within the tub.

Abstract: The invention relates to a valve stopper configured to be positioned inside a barrel of an injection device for injecting a composition through a distal, including: a membrane having a proximal and distal face, the membrane being configured to separate a, distal chamber of the barrel from a proximal chamber; a lateral wall extending from the membrane to define a distal cavity, the lateral wall having a circumferential sealing surface configured to sealingly engage the inner surface of the barrel; where the proximal face presents a concave shape and the membrane includes a notch extending through the membrane between the proximal and distal face, being configured to selectively create a fluid path through the membrane from the proximal face to the distal face depending on the pressure exerted by a composition onto the proximal face of the membrane for transferring fluid only from the second chamber to the first.