METHOD FOR MANUFACTURING A SOCKET SLEEVE FOR PROSTHETIC EXTREMITIES BASED ON THREE-DIMENSIONAL FGF-PRINTING TECHNOLOGY Russian patent published in 2025 - IPC A61F2/80 

FIELD: medical science.

SUBSTANCE: invention refers to medicine, namely to a method for making a socket sleeve for an extremity prosthesis. 3D model of the socket sleeve of the prosthetic extremity is transformed into a set of two-dimensional layers. Polymer granules based on PET-G or PLA are loaded into material loading hopper. Vertical gap is formed between upper and lower parts of metal matrix of sleeve base and matrix is located relative to extruder so that it can be moved along contour of lower part of matrix. FGF-printing process is initiated, wherein material in form of granules is fed from material loading hopper into extruder screw channel and material is melted as it moves in screw channel with rotating screw. Fused material is extruded from the screw channel through the extruder nozzle along the contour of the lower part of the matrix spirally to print the wall of the sleeve to a level above the upper part of the matrix, wherein sleeve wall printing is performed with temperature of 210-250 °C at a feed rate of 0.9-1.1 kg/h, a layer height of 1.3-1.5 mm and a layer width of 4.5-5.5 mm. Extruder is brought above formed horizontally gap between upper part of matrix and wall of sleeve or matrix wall and extruded material from auger channel through extruder nozzle with higher temperature relative to stage of printing walls, width of layer and feed rate, to level of upper part of matrix. Extruder is brought one level higher, the molten material is extruded from the screw channel through the nozzle for layer-by-layer printing of the wall and the space between the printed layers of the side walls of the sleeve is filled with a lower feed rate and a layer width relative to the wall printing stage, until the upward narrowing space is present at the level of each layer. Fused material is extruded from screw channel via extruder nozzle in spiral to print sleeve wall to sleeve top edge bottom ply level and, layer-by-layer, to print sleeve top edge. Printed sleeve is removed from the table, the lower production part of the matrix is disconnected from the sleeve base, the working lower part of the matrix is put in its place, the coating based on thermoplastic material is applied on the surface of the sleeve and the coating is allowed to dry.

EFFECT: higher characteristics of ultimate strength of sleeve in range of 5620-5860 N with production time in range of 5 hours 5 minutes – 6 hours 30 minutes.

1 cl, 4 dwg, 3 ex