Abstract This paper investigates the dynamic response of rectangular prestressed membrane subjected to concentrated impact load based on multiple scale perturbation method. The governing equations of motion of nonlinear vibration are derived based on the Föppl large deflection theory and Galerkin method. By introducing different time scales to consider the process of vibration, the results of dynamic response are obtained by applying the multiple scale perturbation method. Furthermore, the effects of pretension force, velocity of load and dimension of membrane on the dynamic response of membrane are discussed. The present work studies the problem of the dynamic response of prestressed membrane subjected to concentrated impact load in different time scales, and provides a more accurate theoretical model for design of membrane structure.

ABSTRACT Objective: This study aimed to investigate the feasibility of using an acellular dermal matrix (ADM) biological patch for abdominal wall reconstruction and in the treatment of infant and neonatal giant omphalocoele as well as other large abdominal wall defects. Methods: A retrospective analysis of the surgical use of an ADM biological patch for reconstructing the abdominal wall was performed. Eleven infants with giant omphalocoele, one with an iatrogenic large abdominal wall defect, and one with a large abdominal wall hernia were treated by filling the abdominal wall defect with the biological patch and expanding the abdominal cavity volume to avoid sharply increased pressure after the direct suture closure of the abdominal incision. This procedure obtained good results. Results: Infants with giant omphalocoele had good results in 10 of 11 cases (the parents of one patient ended treatment). One infant with an iatrogenic abdominal wall defect and one with a large abdominal wall hernia had good results; at follow-up, neither infant has had complications. Conclusion: Large abdominal wall defects in neonates and infants can be reconstructed by ADM patches with good results.

RESUMEN Objetivo: Este estudio tiene como objetivo investigar la viabilidad del uso del parche de matriz dérmica acelular (MDA) biológico para la reconstrucción de la pared abdominal y el tratamiento de onfaloceles gigantes, así como otros defectos de la pared abdominal en infantes y neonatos. Métodos: Se realizó un análisis retrospectivo del uso quirúrgico del parche biológico de MDA para reconstruir la pared abdominal. Once infantes con onfalocele, uno con un defecto iatrogénico grande de la pared abdominal, y otro con una hernia grande de la pared abdominal, fueron tratados rellenando el defecto de la pared abdominal con el parche biológico y ampliando el volumen de la cavidad abdominal, para evitar un aumento agudamente considerable de la presión tras el cierre de la sutura directa de la incisión abdominal. Este procedimiento dio buenos resultados. Resultados: Los infantes con onfalocele gigante tuvieron buenos resultados en 10 de los 11 casos (los padres de un paciente dieron por terminado el tratamiento). Un niño con defecto iatrogénico de la pared abdominal y uno con una hernia grande de la pared abdominal tuvieron buenos resultados. En el seguimiento, ninguno de los niños tuvo complicaciones. Conclusión: Los defectos grandes de la pared abdominal en recién nacidos y niños pequeños pueden ser reconstruidos con parches de MDA con buenos resultados.