In a suction socket prosthesis, the valve in the lower and medial part of the socket primarily serves to permit air to:

In a suction socket prosthesis, the valve in the lower and medial part of the socket primarily serves to permit air to:

• A. remain during the stance phase of gait
• B. remain during the swing phase of gait
• C. escape during the swing phase of gait
• D. escape during the stance phase of gait

Answer: (D)

The vent valve in a suction socket is there to let air escape as the limb bears weight. During stance, the residual limb is compressed against the socket, and air between the skin and socket tends to be squeezed. If that air couldn’t escape, internal pressure would build and the suction seal could be disrupted, reducing suspension. The valve opens to vent this air, helping maintain the vacuum throughout stance. When the limb is in swing, loading is reduced and the suction is already maintained, so the valve stays closed to keep the vacuum intact.

The vent valve in a suction socket is there to let air escape as the limb bears weight. During stance, the residual limb is compressed against the socket, and air between the skin and socket tends to be squeezed. If that air couldn’t escape, internal pressure would build and the suction seal could be disrupted, reducing suspension. The valve opens to vent this air, helping maintain the vacuum throughout stance. When the limb is in swing, loading is reduced and the suction is already maintained, so the valve stays closed to keep the vacuum intact.