| 摘要 |
A weight-actuated vacuum pump for a hypobarically-controlled artificial limb having a socket (60) with a cavity to receive a residual limb. A dual-action pump has a housing (210) fixedly attached to the socket (60) of the artificial limb, a cylinder (220) reciprocating within the housing (210) and attached to the pylon (54) of the artificial limb, a first chamber within the cylinder (220), a piston (260) reciprocating within the first chamber, a second chamber between the cylinder and the housing (210), and valve means for connecting the first chamber and second chamber to the cavity and to atmosphere. A single-action pump has a housing fixedly attached to the pylon of the artificial limb with a first chamber therein, a piston (260) reciprocating in the first chamber with a seal, forming a second chamber between the piston and the housing, an intake/exhaust port connected to the second chamber, and one-way valves connecting the second chamber to the cavity and to atmosphere. Ambulation causes the vacuum pump, under the influence of the wearer's body weight, to draw air out of the cavity, producing a vacuum within the cavity.
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