| 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) reciprocat-i ng 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 cham-ber 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 at-mospher e. 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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