Evaluation of the sterilization efficacy of domestic electric drills used in orthopaedic surgeries

Abstract

It is estimated that electric drills (ED) have been used in orthopaedic surgeries for bone drilling for more than 50 years in Brazilian hospitals. It is an electric, thermosensitive equipment, not indicated for surgical use, which has not been previously evaluated regarding the sterilization efficacy, being suspect of infection risk. This study evaluated the efficacy of sterilization by ethylene oxide (EtO) of new drills that were intentionally contaminated with Bacillus atrophaeus spores. An experimental, laboratory, randomized applied research was developed, where 16 electric drills were analyzed, in addition to positive and negative controls. All the previously cleaned and sterilized equipment were submitted to contamination by spores. The experimental group was submitted to cleaning and sterilization by EtO and test of sterility by filtration through a 0.45 µm membrane. The membranes were cultivated and Gram and Wirtz-Conklin staining were carried out in positive results for spore visualization. An efficacy of 99.99999881% of the process of sterilization by EtO was confirmed, with a probability of survival of 1.19x 10 -8 . Under the development conditions of the experiment, the efficacy of the sterilization of ED by EtO was confirmed.

The electric drill to better use

“…They confirmed that this process is safe and effective in sanitizing and reusing electric drills. 5 We housed our drill in a formalin chamber because Taylor and Barbeito demonstrated formaldehyde gas thoroughly decontaminated laboratory chambers and scientific instruments in 1969. The source of this gas was paraformaldehyde powder.…”

Reprocessamento de produtos: estado da arte à luz dos estudos de Kazuko Uchikawa Graziano

“…Os PPS de uso único também foram objeto de estudo da autora e de seus colaboradores, que desenvolveram uma proposta para cálculo de custo do processamento de pinças descartáveis utilizadas em cirurgias videolaparoscópicas, instrumentalizando o gestor para a tomada de decisão do reúso desses produtos tendo em vista a questão econômica (Artigos 13 e 14) 13,14 . Três pesquisas comprovaram a possibilidade de esterilização de canetas de bisturi, lâminas de esternotomia e instrumentais laparoscópios, todos de uso único (Artigos 15, 16 e 19) 15,16,19 , suscitando questionamentos acerca dos critérios utilizados pelos fabricantes quanto ao rótulo de uso único de produtos registrados na ANVISA.…”

Inactivation of Bacillus atrophaeus spores in healthcare waste by uv light coupled with H2O2

“…The percentage of sporulated microorganisms was determined from slides prepared by the Gram staining method and by the Wirtz-Conklin method (Demidova and Hamblin, 2005;Golveia et al, 2009;Hamouda et al, 2002). The number of spores was determined in duplicate by manually counting 1000 spores and vegetative cells observed on the slides.…”