METHOD OF MANUFACTURING A HIP EXOPROSTHESIS SLEEVE Russian patent published in 2023 - IPC A61F2/76 A61F2/80 A61F2/60 

FIELD: medicine.

SUBSTANCE: method of manufacturing a hip prosthesis sleeve consists in putting a silicone liner on the femoral stump, putting woven rubber rings on the patient through the perineum and shoulder girdle to designate the perineum. A rigid pattern with variable geometry is fixed in the apparatus for plastering. The patient in a standing position is asked to bring the stump into the inner contour of the pattern. The fastener-comb is adjusted, achieving the fit of the soft tissues of the stump to the surface of the pattern. Then the patient is asked to lean on the upper contour of the pattern — the landing ring and make sure that the ischial tuberosity is located correctly on an inclined platform specially designed for this. Two plasticine control marks protruding above the surface are applied between the pattern and the silicone liner along the front and back of the thigh. Palpation of the stump is carried out. A protruding border of plasticine is applied in the projection of bone landmarks and in the area of the intended upper contour of the sleeve. The patient is asked to remove the stump from the inner contour of the pattern. A 3D data array is recorded using non-contact methods for measuring an infrared 3D scanner from the surface of the stump, a rigid pattern, and a contralateral limb. Registration in the position of the patient standing is carried out. The contralateral limb is also scanned in a vertical position. The hard pattern configuration is read. The images obtained as a result of scanning are sent to a mobile device paired with a 3D scanner through a mobile application recommended by the equipment manufacturer, and then the data is transferred to a personal computer — PC for further processing. The data is processed in a software package that supports polygonal modeling. The sequence of stages of digital material conversion is followed: the surfaces obtained by scanning the stump are combined with the pattern image; remove artifacts and orient the model in accordance with the individual characteristics of a particular patient, smooth the surface of the stump and the pattern, reduce the length of the perimeter of the stump model from the lower edge of the pattern in the range of 0–7%, depending on the impedance of the patient's soft tissues; the upper contour of the sleeve is formed taking into account the visualized marks, the inner layer of the sleeve is created, coplanar to the surface of the stump, the outer layer of the sleeve is formed by reflecting the three-dimensional image of the contralateral limb, the thickness of the sleeve model along the stump is 4.8 mm, taking into account the scheme for constructing the prosthesis, a landing a platform for placing a sleeve adapter and merge two objects, additionally create stiffeners in the connection area, model the end part of the stiffeners in accordance with the shape of the contralateral limb. A physical model of a hip prosthesis sleeve is obtained using a 3D printer with the help of FDM technology. Before the sleeve is printed, the model is sliced using software recommended by the manufacturer of the additive equipment. Incomplete filling of the material is designed, up to 50% between the inner and outer wall of the sleeve in the problem areas of the stump, the most sensitive to the load. PETG plastic is used as the printing material. When printing, an extruder nozzle with a diameter of 0.8 mm is used. The following print settings are determined: the nozzle temperature is set to 220°C, table heating to 70°C, layer height to 0.2 mm, retraction at idle movement of the extruder is 25 mm/s, average printing speed is 50 mm/s; blowing the workpiece is not performed. Supports are made of the material of the main part.

EFFECT: invention ensures the production of a highly personalized prosthetic module — a sleeve of a transfemoral prosthesis.

2 cl, 4 dwg, 2 ex