Patent ID: 7794434

Claim:
A system, comprising: a reservoir for receiving an infusion medium from an infusion medium container, the infusion medium container having an interior volume for holding the infusion medium, the reservoir comprising: a collapsible housing having an interior volume for holding the infusion medium, the collapsible housing being collapsible from an expanded state to reduce the interior volume of the collapsible housing and being expandable from a collapsed state to increase the interior volume of the collapsible housing; and a chamber housing having an interior volume bordered on at least one side by the collapsible housing such that the interior volume of the chamber housing increases as the collapsible housing collapses toward the collapsed state and such that the interior volume of the chamber housing decreases as the collapsible housing expands toward the expanded state, at least a portion of the infusion medium container located external to the chamber housing; wherein the collapsible housing and the chamber housing are configured such that when (i) a gaseous pressure within the interior volume of the chamber housing is less than a particular gaseous pressure within the interior volume of the infusion medium container and (ii) the collapsible housing is in the collapsed state and (iii) a path for transferring the infusion medium is established between the interior volume of the infusion medium container and the interior volume of the collapsible housing, the collapsible housing and the chamber housing allow for a pressure differential between the interior volume of the chamber housing and the interior volume of the infusion medium container to cause the collapsible housing to expand and to cause the infusion medium to be pushed from the infusion medium container to the collapsible housing; the system further comprising: a base adapted to be secured to a user; and a durable housing portion configured to be selectively engaged with and disengaged from the base; wherein the reservoir is supported by the base.