Prosthetic limb sockets and methods of making and using
The present disclosure is directed to prosthetic limb sockets that couple prosthetic limbs to residual limbs. The sockets include a conical cup sized to engage and couple to the residual limb, and a base to secure the socket to the prosthetic limb. The sockets are direct heat-formable onto the residual limb, such that they can be heated and formed as they are secured to the residual limb.
1. A prosthetic limb socket, comprising:
a conical cup comprising:
an opening for insertion of a residual limb,
an end opposite the opening for enclosing the residual limb,
the conical cup configured to be stretched circumferentially around the residual limb,
the conical cup being pliable at temperature between 70° C. and 150° C.,
the conical cup, when heated to the temperature, having a working time of between five minutes and 15 minutes, allowing the conical cup to be heat formed directly onto the residual limb before hardening; and
a lower portion coupled to the end of the conical cup, the lower portion comprising:
a middle portion co-molded to and enclosing the end of the conical cup, the middle portion designed to support the prosthetic limb socket during heat forming, and
a base secured to the middle portion through a fastening member that is attached on a bottom surface of the middle portion, the base having a cylindrical shape and comprising:
a base plate positioned at a bottom of the base, the base plate configured to couple the prosthetic limb socket to a prosthetic limb,
wherein the middle portion is designed to be less pliable at the temperature than the conical cup, and the base is designed to remain rigid at the temperature.
2. The prosthetic limb socket of claim 1 , wherein the conical cup and the lower portion are unitary.
3. The prosthetic limb socket of claim 1 , wherein the lower portion is over-molded to the conical cup.
4. The prosthetic limb socket of claim 1 , wherein the conical cup is composed of a thermoplastic polymer that comprises at least one additive from the group of fiberglass, carbon fiber, aramid fiber, glass beads, and carbon nanotubes.
5. The prosthetic limb socket of claim 1 , further comprising an insert layer comprising one of a rubber, a polyurethane, an estane, spandex, a long chain polymer.
6. The prosthetic limb socket of claim 5 , wherein the insert layer is an insert molded into the conical cup, and wherein the insert layer causes the conical cup to draw tight circumferentially over the residual limb as it is applied and formed.
7. The prosthetic limb socket of claim 1 , further comprising an outer layer surrounding at least a portion of the conical cup.
8. The prosthetic limb socket of claim 7 , wherein the outer layer is co-molded or adhered to an external surface of the socket.
9. The prosthetic limb socket of claim 1 , further comprising an insulating layer configured to be attached to the residual limb and secured within the conical cup.
10. The prosthetic limb socket of claim 1 , wherein an attachment member having a receptacle is coupled to the base.
11. The prosthetic limb socket of claim 10 , further comprising an insulating cover configured to prevent heating of the base during heating of the conical cup.
12. The prosthetic limb socket of claim 1 , wherein the conical cup comprises a circumference that is configured to be smaller than a circumference of the residual limb.
13. A method for securing the prosthetic limb socket of claim 1 to the residual limb comprising:
heating the prosthetic limb socket to a temperature between 70° C. and 150° C.
14. The method of claim 13 , further comprising:
stretching the conical cup of the prosthetic limb socket over the residual limb.
15. The method of claim 14 , further comprising:
placing a piece of at least one of a foam, gel, and fabric within a liner placed over the residual limb for creating a corresponding void during stretching of the conical cup over the residual limb.
16. The method of claim 13 , wherein the method further comprises positioning an insulating cover over a portion of the base, and wherein the insulating cover prevents heating of the base during the heating of the conical cup.
17. The method of claim 13 , wherein, before heating the prosthetic limb socket, the conical cup comprises a circumference that is smaller than a circumference of the residual limb.
18. The method of claim 13 , further comprising:
sizing the conical cup of the prosthetic limb socket by identifying a circumference of the residual limb using a sizing aid; and
calculating a circumference of the conical cup using a reduction factor associated with the sizing aid.
19. The method of claim 13 , further comprising:
applying an outer sleeve around a portion of the conical cup, wherein the outer sleeve reduces a circumference of the conical cup as the outer sleeve is stretched vertically.
20. The method of claim 19 , further comprising:
after heating the prosthetic limb socket, inserting the residual limb into the prosthetic limb socket and applying downward weight, thereby extending the outer sleeve and causing it to circumferentially compress a portion of the prosthetic limb socket onto the residual limb.