Patent ID: 8225780

Claim:
A diaphragm for defining a closed region within a medicament dispensing device including a main body, a sleeve movably positioned within said main body, and a spring operatively positioned in said main body to apply a preload force to said sleeve, said diaphragm comprising: a relatively rigid central disk made of a first material having a relatively high stiffness, and adapted to be affixed to an inner end of said main body of said medicament dispensing device; a peripheral attachment ring disposed about a peripheral portion of said disk and adapted to be attached to a closed end of said sleeve of said medicament dispensing device; and an annular flexure made of a second material having a relatively low stiffness, and extending between said peripheral portion of said disk and said attachment ring to thereby define a closed region between said diaphragm and said closed end of said sleeve; and wherein said annular flexure is bonded to said disk, and wherein said disk, said annular flexure and said peripheral ring form a contiguous assembly.