Advanced textile composite ring for Ilizarov external fixator system

Abstract

The use of a radiolucent composite material permits easier and more accurate radiographic evaluation of the bone healing process, and results in a much lighter system. The finite element method (FEM) is employed to determine the worst possible in-service loading condition and the ring dimensions are modified accordingly. Half-ring prototypes are produced using two types of composite materials: knitted aramid fibre fabric reinforced epoxy and random short carbon (RSC) fibre reinforced epoxy. The in-plane compressive strength and axial stiffness of the complete frame are tested according to ASTM specifications. The performance is evaluated, and compared with an existing system in simulated in-service conditions.

Feasibility of knitted carbon/PEEK composites for orthopedic bone plates

“…Furthermore, textile fabric composites may be preferred to orthopedic fixations in order to avoid the fixation fracture. In the past, almost composite fixations were fabricated by unidirectional laminated composites except the works of Simoes et al (hip replacement [6]), Baidya et al (external fixation [23]) and, Huang and Ramakrishna (prosthetic socket [24]). However, unidirectional laminated composites occasionally suffer the delamination fracture and this fracture manner is remarkably seen if the fixation has joint holes such as bone plates [17,21].…”

“…Among them, knitted fabric-reinforced composites have received increasing attention since they have several benefits such as mass productivity, low fabrication cost, and especially high drape ability to complicated contours [1]. In orthopedic applications, fiber-reinforced composites have been proposed for intramedullary nail [2,3], hip joint replacement [4][5][6][7][8], bone plate fixation [9][10][11][12][13][14][15][16][17][18][19][20][21][22], external fixation [23], prosthetic socket [24], and vertebral fixation [25][26][27][28][29]. However, notwithstanding several benefits of knitted fabric composites, very limited reports have been given on knitted composites for orthopedic applications.…”

Optimization of a Patient-Specific External Fixation Device for Lower Limb Injuries

“…The mechanical performance of external fixation devices has been investigated by finite element analysis (FEA), considering either individual components of the frame or the entire assembled frame [ 16 , 18 , 19 , 20 ]. Sternick et al [ 21 ] used FEA to study the relationship between the stiffness of the external fixator and the number of pins and concluded that the stiffness of the fixator with four pins is 19% and 42% higher than the stiffness of external fixators with three and two pins.…”

Avaliação mecânica e de composição de liga metálica de dois tamanhos de anéis para fixador externo circular de três diferentes fabricantes para cães

“…A resistência à compressão no plano do anel é utilizada para medir a resistência e rigidez à compressão de elementos do anel de fixadores externos circulares. Este teste também fornece uma indicação da capacidade do anel para sustentar as altas tensões de fios e a consistência do produto, mas não se destina a prever a eficácia clínica e segurança do produto testado (BAIDYA et al, 2001;BAIDYA et al, 2003). Rotbande et al (1996) Os dados foram obtidos por uma eletrônica de aquisição de espectros e de integração de carga.…”