A prosthetic device for attachment to a residual limb is provided that
includes a socket-forming member configured to receive the residual limb,
a first portion, and a second portion that is operatively connected to
the first portion and rotationally movable relative to the first portion.
The prosthetic device also includes a pump attached to the first portion
that is adapted to draw a negative pressure within the socket-forming
member upon rotational movement of the second portion relative to the
first portion.