Improving the Composite Materials for Bi Lateral Prosthesis with Below Knee Amputation

Abstract

This study used the tensile and fatigue test to find the properties of composite material used to fabricate a prosthetic socket with below knee amputation using an excluding air technique. The composite materials consisted of eight layers of carbon-fiber for first socket and eight layers of perlon for second socket of below knee amputation. This study was conducted on a patient have 45years old of height 164cm and weight95kg were measured, and the results showed that the ultimate stress (Ϭult) and yield stress (Ϭy) for eight layers of perlon was39 MPa and 36 MPa, while for eight layers of carbon-fiber was 135 MPa and 121 MPa. The fatigue limit for eight layers of perlon was 15 MPa and for eight layers of carbon-fiber was 90 MPa. The value of pressure on the internal wall of the prosthetic socket was measured by F-socket sensor between stump and socket for four position; this data is anterior =210kPa, lateral=313kPa, posterior=225kPa and medial=180kPa. From mechanical properties and ANSYS workbench 14.5software, the safety factor for below knee socket with eight layers of carbon-fiber is (1.35) which is acceptable for socket design. The safety factor for below knee socket with eight layers of perlon is (0.22) which is failure.

Scoping Review of Mechanical Testing of the Structural and Material Properties of Lower-Limb Prosthetic Sockets

“…Authors directly referenced currently available standards for 20 of the 30 test procedures, 19,21,23,24,28,34–39,41 although none of the tests were conducted with full adherence to the referenced standard. Tensile strength testing was the most common mechanical test performed on specimens, appearing in seven articles 21,23,24,34,37,38,41 . Static ultimate strength testing, with or without first conducting static proof testing as recommended by the ISO 10328 standard, was the most common mechanical test conducted on whole sockets, also appearing in seven articles 19,23,24,28,35,36,39 .…”

“…Fabrication of the specimen used for tensile testing varied among the seven articles that reported specimen tests 21,23,24,34,37,38,41 . Three articles used cut specimens from a fabricated socket 34,37,38 .…”

“…One article fabricated the material into a mold of the desired specimen shape 23 . The remaining article was unclear regarding specimen fabrication 41 …”

“…The fabrication methods used for forming sockets and specimens in the 14 articles were also assessed (Table 6). Lamination was the most common fabrication method, with 20 of the 30 test methods testing sockets or specimens prepared using lamination 19,21,23,28,34–38,41 . The second most common fabrication method involved 3D printing, with 14 test methods testing sockets or specimens prepared using fused deposition modeling and laser sintering 24,25,28,36,39,40 .…”

“…33 Ultimately, 14 articles were included in this review. 19,21,[23][24][25]28,[34][35][36][37][38][39][40][41]…”