Socket system including a vacuum liner for prosthetic or orthotic devices and associated methods
The socket system includes a socket and a vacuum liner. A one-way valve is positioned within the closed distal end of the socket and provides controlled fluid communication between the interior socket space and an external environment. The closed distal end of the vacuum liner includes a distal portion formed of a higher durometer elastomeric material than the surrounding portions of the liner, and including a concave section extending from an external surface thereof towards the interior liner space. The socket, on the interior of the closed distal end thereof, includes a receiving portion that corresponds to and receives the distal portion of the vacuum liner 20 (e.g. matching the perimeter and depth of the distal portion). The receiving portion includes a bottom surface (e.g. a flat surface) opposite to the concave section of the vacuum liner when received therein, and defining an exterior liner space therewith.
1. A vacuum liner for use with a prosthetic device to be secured to a residual limb, the vacuum liner comprising:
an elongated elastomeric tube having a closed distal end and an open proximal end, and defining an interior liner space configured to receive the residual limb;
the closed distal end including a distal portion formed of a higher durometer elastomeric material than surrounding portions of the elastomeric tube;
wherein the distal portion defines a disk shaped protrusion having a perimeter and includes an exterior liner space defined by a recessed concave surface formed by a depth into the higher durometer elastomeric material, the recessed concave surface extending from an external end-surface of the distal portion adjacent to the perimeter and towards the interior liner space;
wherein the distal portion is sized and configured for mating against a surrounding socket so that as weight is applied to the socket, the exterior liner space collapses due to applied weight and forces air contained out of the socket, when weight is relieved from the socket, the higher durometer elastomeric material of the distal portion is urged to return to its original shape, pulling air into the exterior liner space from the surrounding socket.
2. The vacuum liner according to claim 1 wherein a durometer hardness of the elastomeric tube is between 38-55 while a durometer hardness of the distal portion is between 60-90 on the Shore-OO scale.
3. The vacuum liner according to claim 1 wherein the distal portion and concave section defining at least part of vacuum pump are integrally formed with the elongated elastomeric tube as a monolithic unit.
4. A method of making a vacuum liner for use with a prosthetic device to be secured to a residual limb, the method comprising:
forming an elongated elastomeric tube having a closed distal end and an open proximal end, and defining an interior liner space configured to receive the residual limb;
forming the closed distal end to include a distal portion of a higher durometer elastomeric material than surrounding portions of the elastomeric tube;
forming the distal portion as defining a disk-shaped protrusion having a perimeter and includes an exterior liner space defined by a recessed concave surface formed by a depth into the higher durometer elastomeric material and extending from an external end-surface of the distal portion adjacent to the perimeter and towards the interior liner space;
wherein the distal portion is sized and configured for mating against a surrounding socket so that as weight is applied to the socket, the exterior liner space collapses due to applied weight and forces air contained out of the socket, when weight is relieved from the socket, the higher durometer elastomeric material of the distal portion is urged to return to its original shape, pulling air into the exterior liner space from the surrounding socket.
5. The method according to claim 4 wherein a durometer hardness of the elastomeric tube is between 38-55 while a durometer hardness of the distal portion is between 60-90 on the Shore-OO scale.
6. A vacuum liner for use with a prosthetic device to be secured to a residual limb, the vacuum liner comprising:
an elongated elastomeric tube having a closed distal end and an open proximal end, and defining an interior liner space configured to receive the residual limb between the open proximal end and the closed distal end;
the closed distal end defining a distal end portion forming an annular protrusion extending distally outwardly from the liner and an exterior liner space defining a recess extending inwardly from an exterior surface of the end portion adjacent to the perimeter and into a thickness of the closed distal end short of the interior liner space such that the thickness of the closed distal end separates the recess from the interior liner space;
wherein the distal portion is sized and configured for mating against a surrounding socket so that as weight is applied to the socket, the exterior liner space collapses due to applied weight and forces air contained out of the socket, when weight is relieved from the socket, the higher durometer elastomeric material of the distal portion is urged to return to its original shape, pulling air into the exterior liner space from the surrounding socket.
7. The vacuum liner of claim 6 , wherein the recess has a concave profile.