Microbiological evaluation of the steam sterilization of assembled laparoscopic instruments

ABSTRACT Objective: assess the safety of steam sterilization of assembled laparoscopic instruments with challenge contamination. Method: a laboratory experimental study, using as test samples trocars and laparoscopic graspers. Geobacillus stearothermophillus ATCC-7953 was used, with a microbial popu...

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Published inRevista latino-americana de enfermagem Vol. 24; p. e2830
Main Authors Camargo, Tamara Carolina de, Graziano, Kazuko Uchikawa, Almeida, Alda Graciele Claudio dos Santos, Suzuki, Karina, Silva, Cely Barreto da, Pinto, Flávia Morais Gomes
Format Journal Article
LanguageEnglish
Published Brazil Escola de Enfermagem de Ribeirão Preto / Universidade de São Paulo 01.01.2016
Universidade de São Paulo
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Online AccessGet full text
ISSN0104-1169
1518-8345
0104-1169
1518-8345
DOI10.1590/1518-8345.1431.2830

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Abstract ABSTRACT Objective: assess the safety of steam sterilization of assembled laparoscopic instruments with challenge contamination. Method: a laboratory experimental study, using as test samples trocars and laparoscopic graspers. Geobacillus stearothermophillus ATCC-7953 was used, with a microbial population of 106UFC/Filter paper substrate, removed from the biological indicator. Three of them were introduced into each instrument at the time of assembly, and sterilized at pressurized saturated steam, 134oC for 5 minutes. After sterilization, the instrument was disassembled and each filter paper substrate was inoculated in soybean casein culture and incubated at 56oC for 21 days. In case of absence of growth, they were subjected to heat shock of 80oC, for 20 minutes and re-incubated for 72 hours. Sample size: 185 graspers and 185 trocars, with 95% power. We paired the experiments with comparative negative control groups (5 graspers and 5 trocars with challenge contamination, sterilized disassembled) and positive control (30 filter paper supports, unsterilized), subject to the same incubation procedures. Results: there was no microbial growth in experimental and negative control. The results of the positive control were satisfactory. Conclusion: this study provided strong scientific evidence to support the safety of steam sterilizing of the assembled laparoscopic instrument. RESUMEN Objetivo: evaluar la seguridad de la esterilización a través de vapor, de instrumental laparoscópico previamente montado con desafío de contaminación. Método: estudio experimental en laboratorio, cuyo cuerpo de prueba fueron trócarte y pinza laparoscópica. Se utilizó esporas Geobacillus stearothermophilus ATCC-7953, con población microbiana de 106UFC/soporte de papel filtro, removidos del indicador biológico. Tres de ellos fueron introducidos en el interior de cada instrumento, en el momento del montaje, los que fueron esterilizados a vapor saturado bajo presión, 134oC por 5 minutos. Después de la esterilización, el instrumental fue desmontado y cada soporte de papel filtro fue inoculado en medio de una cultura de caseína y soya, incubado a 56oC por 21 días. No habiendo crecimiento, fueron sometidos a un choque térmico de 80oC, por 20 minutos y nuevamente incubados por 72 horas. La muestra estuvo constituida por 185 pinzas y 185 trócartes, con poder de 95%. Los experimentos fueron acompañados en los grupos: control negativo comparativo (5 pinzas y 5 trócartes con contaminación desafío, esterilizados desmontados) y positivo (30 soportes de papel filtro, no esterilizados), sometidos a los mismos procedimientos de incubación. Resultados: no se encontró crecimiento microbiano en los grupos experimental y control negativo. Los resultados del control positivo fueron satisfactorios. Conclusión: este estudio suministra fuertes evidencias científicas para sustentar que la práctica, de esterilización a vapor del instrumental laparoscópico montado, es segura. RESUMO Objetivo: avaliar a segurança da esterilização a vapor, do instrumental laparoscópico montado com desafio da contaminação. Método: estudo experimental laboratorial, cujo corpo de prova foram trocarte e pinça laparoscópica. Utilizou-se esporos Geobacillus stearothermophillus ATCC-7953, com população microbiana de 106UFC/suporte de papel filtro, removidos do indicador biológico. Três deles foram introduzidos no interior de cada instrumento, no momento da montagem, sendo esterilizados a vapor saturado sob pressão, 134oC por 5 minutos. Depois da esterilização, o instrumental foi desmontado, e cada suporte de papel filtro foi inoculado em meio de cultura de caseína soja, incubado a 56oC por 21 dias. Não havendo crescimento, foram submetidos a um choque térmico de 80oC, por 20 minutos e reincubados por 72 horas. Tamanho da amostra, 185 pinças e 185 trocartes, com poder de 95%. Os experimentos foram acompanhados dos grupos controle negativo comparativo (5 pinças e 5 trocartes com contaminação desafio, esterilizados desmontados) e positivo (30 suportes de papel filtro, não esterilizados), submetidos aos mesmos procedimentos de incubação. Resultados: não houve nenhum crescimento microbiano nos grupos experimental e controle negativo. Os resultados do controle positivo foram satisfatórios. Conclusão: este estudo forneceu fortes evidências científicas para sustentar a segurança da prática de esterilização a vapor do instrumental laparoscópico montado.
AbstractList ABSTRACT Objective: assess the safety of steam sterilization of assembled laparoscopic instruments with challenge contamination. Method: a laboratory experimental study, using as test samples trocars and laparoscopic graspers. Geobacillus stearothermophillus ATCC-7953 was used, with a microbial population of 106UFC/Filter paper substrate, removed from the biological indicator. Three of them were introduced into each instrument at the time of assembly, and sterilized at pressurized saturated steam, 134oC for 5 minutes. After sterilization, the instrument was disassembled and each filter paper substrate was inoculated in soybean casein culture and incubated at 56oC for 21 days. In case of absence of growth, they were subjected to heat shock of 80oC, for 20 minutes and re-incubated for 72 hours. Sample size: 185 graspers and 185 trocars, with 95% power. We paired the experiments with comparative negative control groups (5 graspers and 5 trocars with challenge contamination, sterilized disassembled) and positive control (30 filter paper supports, unsterilized), subject to the same incubation procedures. Results: there was no microbial growth in experimental and negative control. The results of the positive control were satisfactory. Conclusion: this study provided strong scientific evidence to support the safety of steam sterilizing of the assembled laparoscopic instrument. RESUMEN Objetivo: evaluar la seguridad de la esterilización a través de vapor, de instrumental laparoscópico previamente montado con desafío de contaminación. Método: estudio experimental en laboratorio, cuyo cuerpo de prueba fueron trócarte y pinza laparoscópica. Se utilizó esporas Geobacillus stearothermophilus ATCC-7953, con población microbiana de 106UFC/soporte de papel filtro, removidos del indicador biológico. Tres de ellos fueron introducidos en el interior de cada instrumento, en el momento del montaje, los que fueron esterilizados a vapor saturado bajo presión, 134oC por 5 minutos. Después de la esterilización, el instrumental fue desmontado y cada soporte de papel filtro fue inoculado en medio de una cultura de caseína y soya, incubado a 56oC por 21 días. No habiendo crecimiento, fueron sometidos a un choque térmico de 80oC, por 20 minutos y nuevamente incubados por 72 horas. La muestra estuvo constituida por 185 pinzas y 185 trócartes, con poder de 95%. Los experimentos fueron acompañados en los grupos: control negativo comparativo (5 pinzas y 5 trócartes con contaminación desafío, esterilizados desmontados) y positivo (30 soportes de papel filtro, no esterilizados), sometidos a los mismos procedimientos de incubación. Resultados: no se encontró crecimiento microbiano en los grupos experimental y control negativo. Los resultados del control positivo fueron satisfactorios. Conclusión: este estudio suministra fuertes evidencias científicas para sustentar que la práctica, de esterilización a vapor del instrumental laparoscópico montado, es segura. RESUMO Objetivo: avaliar a segurança da esterilização a vapor, do instrumental laparoscópico montado com desafio da contaminação. Método: estudo experimental laboratorial, cujo corpo de prova foram trocarte e pinça laparoscópica. Utilizou-se esporos Geobacillus stearothermophillus ATCC-7953, com população microbiana de 106UFC/suporte de papel filtro, removidos do indicador biológico. Três deles foram introduzidos no interior de cada instrumento, no momento da montagem, sendo esterilizados a vapor saturado sob pressão, 134oC por 5 minutos. Depois da esterilização, o instrumental foi desmontado, e cada suporte de papel filtro foi inoculado em meio de cultura de caseína soja, incubado a 56oC por 21 dias. Não havendo crescimento, foram submetidos a um choque térmico de 80oC, por 20 minutos e reincubados por 72 horas. Tamanho da amostra, 185 pinças e 185 trocartes, com poder de 95%. Os experimentos foram acompanhados dos grupos controle negativo comparativo (5 pinças e 5 trocartes com contaminação desafio, esterilizados desmontados) e positivo (30 suportes de papel filtro, não esterilizados), submetidos aos mesmos procedimentos de incubação. Resultados: não houve nenhum crescimento microbiano nos grupos experimental e controle negativo. Os resultados do controle positivo foram satisfatórios. Conclusão: este estudo forneceu fortes evidências científicas para sustentar a segurança da prática de esterilização a vapor do instrumental laparoscópico montado.
ABSTRACT Objective: assess the safety of steam sterilization of assembled laparoscopic instruments with challenge contamination. Method: a laboratory experimental study, using as test samples trocars and laparoscopic graspers. Geobacillus stearothermophillus ATCC-7953 was used, with a microbial population of 106UFC/Filter paper substrate, removed from the biological indicator. Three of them were introduced into each instrument at the time of assembly, and sterilized at pressurized saturated steam, 134oC for 5 minutes. After sterilization, the instrument was disassembled and each filter paper substrate was inoculated in soybean casein culture and incubated at 56oC for 21 days. In case of absence of growth, they were subjected to heat shock of 80oC, for 20 minutes and re-incubated for 72 hours. Sample size: 185 graspers and 185 trocars, with 95% power. We paired the experiments with comparative negative control groups (5 graspers and 5 trocars with challenge contamination, sterilized disassembled) and positive control (30 filter paper supports, unsterilized), subject to the same incubation procedures. Results: there was no microbial growth in experimental and negative control. The results of the positive control were satisfactory. Conclusion: this study provided strong scientific evidence to support the safety of steam sterilizing of the assembled laparoscopic instrument.
assess the safety of steam sterilization of assembled laparoscopic instruments with challenge contamination. a laboratory experimental study, using as test samples trocars and laparoscopic graspers. Geobacillus stearothermophillus ATCC-7953 was used, with a microbial population of 106UFC/Filter paper substrate, removed from the biological indicator. Three of them were introduced into each instrument at the time of assembly, and sterilized at pressurized saturated steam, 134oC for 5 minutes. After sterilization, the instrument was disassembled and each filter paper substrate was inoculated in soybean casein culture and incubated at 56oC for 21 days. In case of absence of growth, they were subjected to heat shock of 80oC, for 20 minutes and re-incubated for 72 hours. Sample size: 185 graspers and 185 trocars, with 95% power. We paired the experiments with comparative negative control groups (5 graspers and 5 trocars with challenge contamination, sterilized disassembled) and positive control (30 filter paper supports, unsterilized), subject to the same incubation procedures. there was no microbial growth in experimental and negative control. The results of the positive control were satisfactory. this study provided strong scientific evidence to support the safety of steam sterilizing of the assembled laparoscopic instrument.
assess the safety of steam sterilization of assembled laparoscopic instruments with challenge contamination.Objectiveassess the safety of steam sterilization of assembled laparoscopic instruments with challenge contamination.a laboratory experimental study, using as test samples trocars and laparoscopic graspers. Geobacillus stearothermophillus ATCC-7953 was used, with a microbial population of 106UFC/Filter paper substrate, removed from the biological indicator. Three of them were introduced into each instrument at the time of assembly, and sterilized at pressurized saturated steam, 134oC for 5 minutes. After sterilization, the instrument was disassembled and each filter paper substrate was inoculated in soybean casein culture and incubated at 56oC for 21 days. In case of absence of growth, they were subjected to heat shock of 80oC, for 20 minutes and re-incubated for 72 hours. Sample size: 185 graspers and 185 trocars, with 95% power. We paired the experiments with comparative negative control groups (5 graspers and 5 trocars with challenge contamination, sterilized disassembled) and positive control (30 filter paper supports, unsterilized), subject to the same incubation procedures.Methoda laboratory experimental study, using as test samples trocars and laparoscopic graspers. Geobacillus stearothermophillus ATCC-7953 was used, with a microbial population of 106UFC/Filter paper substrate, removed from the biological indicator. Three of them were introduced into each instrument at the time of assembly, and sterilized at pressurized saturated steam, 134oC for 5 minutes. After sterilization, the instrument was disassembled and each filter paper substrate was inoculated in soybean casein culture and incubated at 56oC for 21 days. In case of absence of growth, they were subjected to heat shock of 80oC, for 20 minutes and re-incubated for 72 hours. Sample size: 185 graspers and 185 trocars, with 95% power. We paired the experiments with comparative negative control groups (5 graspers and 5 trocars with challenge contamination, sterilized disassembled) and positive control (30 filter paper supports, unsterilized), subject to the same incubation procedures.there was no microbial growth in experimental and negative control. The results of the positive control were satisfactory.Resultsthere was no microbial growth in experimental and negative control. The results of the positive control were satisfactory.this study provided strong scientific evidence to support the safety of steam sterilizing of the assembled laparoscopic instrument.Conclusionthis study provided strong scientific evidence to support the safety of steam sterilizing of the assembled laparoscopic instrument.
Author Suzuki, Karina
Pinto, Flávia Morais Gomes
Camargo, Tamara Carolina de
Almeida, Alda Graciele Claudio dos Santos
Graziano, Kazuko Uchikawa
Silva, Cely Barreto da
AuthorAffiliation 7 PhD, Professor Instructor, Faculdade de Ciências Médicas, Santa Casa de Misericórdia, São Paulo, SP, Brazil
3 PhD, Full Professor, Escola de Enfermagem, Universidade de São Paulo, São Paulo, SP, Brazil
5 PhD, Adjunct Professor, Faculdade de Enfermagem, Universidade Federal de Goiás, Goiânia, GO, Brazil
6 MSc, Pharmacy-Biochemistry, Santa Casa de Misericódia, São Paulo, SP, Brazil
4 MSc, Doctoral student, Escola de Enfermagem, Universidade de São Paulo, São Paulo, SP, Brazil
2 PhD, Assistant Professor, Faculdade de Ciências Médicas e da Saúde, Pontifícia Universidade Católica de São Paulo, Sorocaba, SP, Brazil
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– name: 3 PhD, Full Professor, Escola de Enfermagem, Universidade de São Paulo, São Paulo, SP, Brazil
– name: 6 MSc, Pharmacy-Biochemistry, Santa Casa de Misericódia, São Paulo, SP, Brazil
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  givenname: Kazuko Uchikawa
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  givenname: Karina
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  organization: Santa Casa de Misericódia, Brazil
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BackLink https://www.ncbi.nlm.nih.gov/pubmed/27878222$$D View this record in MEDLINE/PubMed
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Cites_doi 10.1021/jp901801k
10.1111/j.1365-2672.2007.03330.x
10.1046/j.1365-2672.1998.00607.x
10.5327/Z1414-4425201400040004
10.1590/S0103-21002008000300018
10.1016/S0001-2092(07)61520-8
10.1590/S0104-11692011000200020
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Keywords Instrumentos Cirúrgicos
Instrumentos Quirúrgicos
Evidence-Based Nursing
Enfermagem
Surgical Instruments
Laparoscopy
Enfermagem Baseada em Evidências
Operating Room Nursing
Enfermería Basada en la Evidencia
Enfermagem de Centro Cirúrgico
Nursing
Sterilization
Enfermería de Quirófano
Laparoscopía
Esterilização
Enfermería
Laparoscopia
Esterilización
Language English
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Snippet ABSTRACT Objective: assess the safety of steam sterilization of assembled laparoscopic instruments with challenge contamination. Method: a laboratory...
assess the safety of steam sterilization of assembled laparoscopic instruments with challenge contamination. a laboratory experimental study, using as test...
assess the safety of steam sterilization of assembled laparoscopic instruments with challenge contamination.Objectiveassess the safety of steam sterilization...
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SubjectTerms Enfermería
Enfermería Basada en la Evidencia
Enfermería de Quirófano
Equipment Contamination
Esterilización
Instrumentos Quirúrgicos
Laparoscopes - microbiology
Laparoscopía
NURSING
Original
Steam
Sterilization - methods
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Title Microbiological evaluation of the steam sterilization of assembled laparoscopic instruments
URI https://www.ncbi.nlm.nih.gov/pubmed/27878222
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