METHOD OF MAKING STRUCTURAL ELEMENT IN FORM OF SEMI-RING OF ILIZAROV APPARATUS BASED ON COMPOSITE MATERIAL WITH POLYMER THERMOSETTING MATRIX REINFORCED WITH 3D SOLID-WOVEN PREFORM IN FORM OF SPIRAL TAPE Russian patent published in 2025 - IPC A61B17/62 A61L31/02 

FIELD: medicine.

SUBSTANCE: method of making a structural element in the form of a semi-ring of the Ilizarov apparatus based on a composite material with a polymer thermosetting matrix reinforced with 3D solid-woven preform in the form of a spiral tape. At the first stage, reinforced 3D solid-woven preform is made in the form of a spiral tape based on continuous carbon threads, a multilayer weave, structure consisting of 3 solid-woven layers formed by weaving reinforcing threads arranged in three directions so that the length of the longitudinal threads in the outer part of the ring is greater than the length of the longitudinal threads in the inner part of the ring, due to which the preform acquires the calculated curvature corresponding to the diameter of the semi-ring of the Ilizarov apparatus, which is in range of 100-240 mm, wherein transverse filaments are arranged radially while vertical filaments are arranged perpendicular to lengthwise and crosswise filaments. At the second stage, a part of the tape of reinforced 3D solid-woven preform is cut, which is equal to the size of the semi-ring of the Ilizarov apparatus. At the third stage, the tooling mould is made to form the semi-ring of the Ilizarov apparatus taking into account the arrangement of the elements for imparting a curved shape to the attachment points for the possibility of subsequent connection with other structural elements. At the fourth stage, the tape of reinforced 3D solid-woven preform is laid in the tooling mould and impregnated with the binder by the RTM method. At the fifth stage, after curing of the binder, the finished semi-ring of the Ilizarov apparatus is removed from the tooling mould, the flash of the external circuit is removed and holes are drilled.

EFFECT: invention provides increased structural integrity of the product, uniform strength and rigidity due to uniform distribution of fibres in circumferential and axial directions for reduction of production works.

1 cl, 5 dwg