Patent ID: 8828094

Claim:
A residual limb suspension liner for a prosthesis, the liner forming a closed-ended, tubular sleeve having a longitudinal axis, and defining along the axis a lower portion, an upper portion, and a center portion extending between the lower and upper portions, the liner divided along an anterior-posterior plane between anterior and posterior aspects, the liner comprising: a first layer defined by a first elastomeric material and having first and second surfaces spaced by a first thickness, the first surface forming a continuous circumferential internal surface of the liner and configured for contacting skin of a residual limb; a second layer defined by a second elastomeric material and having first and second surfaces spaced by a second thickness, the second layer first surface being adjacent and integrally joined to the first layer second surface, the second layer having a variable radial thickness section over the anterior aspect of the liner over a cross-sectional slice of the liner, the variable radial thickness section tapering toward lateral and medial sides of the liner from the anterior aspect, a posterior side thickness of the second layer at a predetermined height of the liner being less than an anterior side thickness of the second layer at the same predetermined height; wherein the liner defines an outer peripheral surface and the second layer radial thickness tapers inwardly toward the longitudinal axis relative to the outer peripheral surface; wherein the radial thickness of the second layer increases toward the lower portion of the liner and is greatest thereat; wherein the thickness of the first layer adjacent the second layer remains consistently the same across the lower, upper and center portions of the liner.