Patent ID: 7967773

Claim:
A disposable medical cassette for housing medication in a tamper resistant enclosure for selective coupled attachment to an ambulatory infusion pump, comprising: a first assembly comprising a rear housing and a pressure plate, said first assembly including a plurality of tamper resistant lock receiving structures formed in the rear housing and at least one tabbed snap member, each lock receiving structure having a sloped shim surface and defining an undercut space; and a second assembly comprising a cover including a plurality of lock feature protrusions and at least one slotted aperture, each lock feature protrusion having a sloped shim surface and a tab body; wherein said first assembly and said second assembly are adapted for permanent coupling by a bifurcated lock system including a first lock arrangement and a second lock arrangement, said first lock arrangement defined by said sloped shim surfaces of said lock feature protrusions of the second assembly in a friction and interference fit against said sloped shim surfaces of said lock receiving structures of the first assembly, the friction and interference fit of said sloped shim surfaces drawing the first assembly and the second assembly together into close contact when assembled to form a tight perimeter seam between the first assembly and second assembly, the first lock arrangement further defined by an interference fit of said tab bodies located in said undercut spaces that restricts lateral sliding movement and transverse separating movement of the first and second assemblies, said second lock arrangement defined by said at least one tabbed snap member of the first assembly engaged within said at least one corresponding slotted aperture of the second assembly such that the second lock arrangement cannot be accessed to reopen the cassette without compromising the cassette once assembled.