Wound drainage device

摘要

A device for removing fluids from a wound includes a housing and a passive bellows inside the housing. The bellows can be collapsed and retained in a collapsed or activated state. Upon release from its activated state, the bellows is expanded so as to provide a substantially constant level of negative pressure whereupon fluids from a wound are automatically drawn into and collected within the bellows at a substantially constant rate of suction throughout the range of evacuation. Preferably the bellows is expanded by a constant force ribbon spring which provides a constant force of expansion. Additionally, the housing is preferably transparent with graduations etched thereon permitting the visible inspection and measurement of the fluids removed from the wound.