Modular prosthetic sockets and methods for making same
The invention relates to a prosthetic socket for a residual limb of the lower extremity or upper extremity of an individual person. The residual limb has particular dimensions and anatomical contours; the prosthetic socket has dimensions and contours that fit the dimensions and contours of the residual limb. The prosthetic socket may also fit in a manner that is biomechanically particularly appropriate for the individual. The prosthetic socket is an assembly of components from groups of components that include (a) struts arranged longitudinally with respect to the residual limb, (b) proximal brim members arranged proximally to the struts and connected thereto; and (c) distal socket members disposed at the distal base of the prosthetic socket. The socket components within these groups may be modular in that they can vary with respect to dimensions and/or contours, and yet have common connecting features that permit assembly of the components together to form the prosthetic socket.
1. A modular prosthetic socket for a residual limb of a lower extremity of a patient, the modular prosthetic socket comprising:
four longitudinal struts arranged longitudinally with respect to the residual limb, each strut having a distal portion and a proximal end;
a distal attachment member coupled with the distal portions of the four struts, wherein the distal portion of each of the four struts is adjustable in an angle by which it is mounted to the distal attachment member, and wherein the distal attachment member comprises;
a distal component comprising a first serrated channel;
a proximal component attached to the distal component to form the distal attachment member, wherein the proximal component comprises a second serrated channel, and wherein the first serrated channel and the second serrated channel are configured to be joined together when the distal component is attached to the proximal component, in order receive the distal portions of the four struts and attach them to the distal attachment member; and
a moisture evacuation channel extending through the distal component and the proximal component; and
four proximal brim members, each of which is coupled with a separate one of the proximal ends of the four struts.
2. The modular prosthetic socket of claim 1 , wherein the four proximal brim members comprise:
an anterior-medial proximal brim member coupled with the proximal end of one of the struts and fabricated for an anterior-medial aspect of the proximal brim;
an ischial proximal brim member coupled with the proximal end of another of the struts and fabricated for an ischial aspect of the proximal brim; and
two lateral proximal brim members fabricated for the proximal ends of another two of the struts and fabricated for two lateral aspects of the proximal brim.
3. The modular prosthetic socket of claim 1 , wherein each of the proximal brim members includes an insertion member fabricated to be compatible with a proximal brim receiver of each of the proximal ends of the struts.
4. The modular prosthetic socket of claim 1 , further comprising a distal end pad positioned on the distal component of the distal attachment member.
5. The modular prosthetic socket of claim 1 , further comprising:
an encircling band around the four longitudinal struts; and
a tensioning mechanism coupled with one of the four longitudinal struts and the encircling band, wherein the tensioning mechanism is configured tighten or loosen to adjust tension imparted to the struts.
6. The modular prosthetic socket of claim 1 , further comprising a flexible inner liner arranged on an interior aspect of the socket, such interior aspect including interior aspects of at least one of the four proximal brim members, the four longitudinal struts, or the distal attachment member, wherein the flexible inner liner increases pressure distribution by interfacing with the residual limb.
7. The modular prosthetic socket of claim 6 , wherein the flexible liner comprises sufficient stiffness and resilience that it can support distribution of pressure with substantial uniformity across its surface.
8. The modular prosthetic socket of claim 1 wherein the distal attachment member includes four connection features disposed at spaced apart locations around its circumference, and wherein each connection feature is configured for mounting the distal portion of one strut onto the distal attachment member, such that, when the socket is assembled, the socket does not have a continuous surface around the circumference of the distal attachment member.
9. The modular prosthetic socket of claim 1 , wherein the struts are moldable via application of heat to the struts.
10. The modular prosthetic socket of claim 1 , wherein each of the four struts comprises a telescoping mechanism for adjusting the strut to a desired height.
11. The modular prosthetic socket of claim 1 , wherein the distal portion of each of the struts is directly formable to the residual limb.