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4.
Arch. cardiol. Méx ; 89(3): 216-221, jul.-sep. 2019. tab, graf
Article in English | LILACS | ID: biblio-1149070

ABSTRACT

Abstract Objective: Anticoagulation is the primary management to prevent venous thromboembolism; inferior vena cava filters (IVCFs) provide a mechanical prophylactic alternative when anticoagulation is contraindicated. The aim of this study was to evaluate in IVCF patients, whether the initiation of anticoagulation therapy is associated with decreased rates of recurrent thrombotic events and device-related complications. Methods: This was a retrospective review of patients that underwent insertion of IVCF. Subjects with IVCF were studied in two groups: those initiated on anticoagulation (A) and without anticoagulation (NA). Variables as indications for IVCF, anticoagulation, recurrence of thrombosis, complications, and reinterventions were examined. Results: From April 2007 to March 2014, 54 patients underwent IVCF placement; (61% of females), with mean age of 54 years (standard deviation ± 19). 28 (52%) were initiated on anticoagulation, during a mean follow-up period of 28 months, five experienced recurrent thrombosis and three were on the A group (p=0.5); when comparing patients that developed post-thrombotic syndrome, seven were in the A group and seven in the NA. Two patients with IVC rupture were in the A group (p=0.5), and the only case of IVCF migration occurred in the A group. 11 (20%) patients died from comorbidities nonrelated to the device or procedure (four in the A cohort). Conclusions: Patients with IVCF on anticoagulation have equivalent rates of thrombotic events and device-related complications than those patients NA.


Resumen Objetivo: La anticoagulación es la terapia de elección para la prevención de tromboembolismo venoso; los filtros de vena cava inferior (FVCI) proveen una alternativa mecánica profiláctica cuando la anticoagulación está contraindicada. El objetivo de este estudio fue evaluar si la terapia anticoagulante se asocia con una tasa menor de eventos trombóticos recurrentes y complicaciones relacionadas con el dispositivo. Métodos: Los pacientes fueron categorizados en dos grupos: Aquellos a los que se les inicio anticoagulación (A) y aquellos que no (NA). Variables tales como indicación de la colocación del filtro, anticoagulación, recurrencia de trombosis y complicaciones fueron examinadas. Resultados: De abril de 2007 a marzo 2014, a 54 pacientes se les coloco un filtro (61% fueron mujeres), con una media de edad de 54 años [Desviación estándar (DE) ±19. Veintiocho (52%) fueron iniciados en anticoagulación y durante un seguimiento de 28 meses, 5 pacientes experimentaron recurrencia de trombosis, 3 en el grupo A (p=0.5). Al comparar los pacientes que desarrollaron síndrome posflebítico, 7 pertenecieron al grupo A y 7 al grupo NA. Dos pacientes con ruptura de vena cava pertenecieron al grupo A (p=0.5) y el único caso de migración del dispositivo ocurrió en el grupo A. Once (20%) pacientes fallecieron debido a comorbilidades no relacionadas con el dispositivo o el procedimiento. Conclusión: Pacientes con FVCI en anticoagulación tienen tasas de eventos trombóticos y complicaciones asociadas a los dispositivos equivalentes a aquellos pacientes sin anticoagulación.


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Aged , Aged, 80 and over , Young Adult , Thrombosis/epidemiology , Vena Cava Filters/adverse effects , Foreign-Body Migration/epidemiology , Anticoagulants/administration & dosage , Recurrence , Thrombosis/etiology , Incidence , Retrospective Studies , Equipment Failure
5.
Int. braz. j. urol ; 45(4): 853-853, July-Aug. 2019.
Article in English | LILACS | ID: biblio-1040056

ABSTRACT

ABSTRACT Introduction Urological surgery is estimated to be the third most common cause of iatrogenic-retained foreign bodies 1. Presentation A 76-year old man was undergoing a transurethral resection of bladder tumor with a 26-Ch continuous flow resectoscope (Karl Storz, Germany). Before starting resection, a detachment of resectoscope sheath tip was noted. The ceramic tip was free-floating in the bladder lumen, and it would not fit within the sheath, making direct extraction using the loop impossible. An attempt was made to break it with a stone punch, but it was unsuccessful due to impossibility of closing it in the branches. Therefore, we decided to fragment the tip with holmium laser (RevoLix®, LISA Laser products, Germany), using an 800-micron, front-firing fiber. Laser device was settled at with 2.5 J energy and 5 Hz frequency. Ceramic appeared very hard, but it was difficult to carry on breaking with this setting because of tip retropulsion. Then, laser setting was switched to lower energy and higher frequency (1 J and 13 Hz). This setting guaranteed the same power of 13 W, but with minimal retropulsion. Results Tip was fragmented against the posterior bladder wall in seven pieces, which were retrieved trough the outer sheath. A total 5.62 kJ were used to fragment it. At the end, superficial lesions of the posterior bladder wall were highlighted. Surgical time was 55 minutes. Patient was discharged home next day without problems. Conclusions Holmium laser fragmentation is a safe and effective approach to remove foreign bodies from the bladder.


Subject(s)
Humans , Male , Aged , Urinary Bladder/surgery , Ceramics/radiation effects , Equipment Failure , Lasers, Solid-State/therapeutic use , Foreign Bodies/surgery , Radiation Dosage , Time Factors , Urinary Bladder Neoplasms/surgery , Treatment Outcome , Operative Time
6.
Clinics ; 74: e1076, 2019. tab, graf
Article in English | LILACS | ID: biblio-1019701

ABSTRACT

OBJECTIVES: Machinery injuries account for a substantial share of traumatic upper limb injuries (TULIs) affecting young active individuals. This study is based on the hypothesis that there is an important relationship between the improper use of power saws and TULIs. The aim of the study is to assess the prevalence and epidemiology of TULIs caused by power saws and determine the risks related to power saw use. METHODS: A cross-sectional evaluation of medical records from a two-year period was performed. Patients sustaining TULIs related to power saws were analyzed. Data on the epidemiology, site of injury, mechanism of trauma, technical specifications of the tool, cutting material, personal protective equipment, time lost and return to work were obtained. RESULTS: A database search retrieved 193 TULI records, of which 104 were related to power saws. The majority of patients were male (102/104; 98.1%), right-handed (97/104; 93.3%), and manual workers (46/104; 44.2%), with an average age of 46.8 years. The thumb was the most frequently injured site (32/93; 34.4%). Most of the injuries were caused by manual saws (85/104; 81.7%), and masonry saws accounted for 68.2% (58/85) of the cases. Masonry saws improperly used for woodwork resulted in 86.2% (50/58) of the injuries. TULI caused by masonry saws was 5 times higher in manual workers than in other patients. In addition, masonry saws had a risk of kickback 15 times higher than that of other saws, and the risk of injury increased by 5.25 times when the saws were used improperly for wood cutting. CONCLUSIONS: The profile of TULIs related to power saws was demonstrated and was mainly associated with manual saws operated by manual workers that inappropriately used masonry saws for woodworking.


Subject(s)
Humans , Male , Female , Adolescent , Adult , Middle Aged , Aged , Young Adult , Equipment Failure/statistics & numerical data , Forearm Injuries/etiology , Hand Injuries/etiology , Brazil/epidemiology , Accidents, Occupational/statistics & numerical data , Cross-Sectional Studies , Risk Factors , Forearm Injuries/epidemiology , Hand Injuries/epidemiology
7.
Neurointervention ; : 27-34, 2019.
Article in English | WPRIM | ID: wpr-741676

ABSTRACT

PURPOSE: Complete removal of air bubbles from balloons for neurovascular angioplasty is cumbersome. We compared the preparation difficulty, air removal efficiency, and air collection pattern of six different balloon catheter preparation methods to propose a better preparation method for both initial and second balloon uses, especially for small-profile angioplasty balloon catheters. MATERIALS AND METHODS: A total of 18 neurovascular angioplasty balloon catheters with nominal diameters of 2 mm were prepared to test six different preparation methods: the instruction for use method (method A), simplified method using a syringe (method B) and four newly devised preparation methods using inflating devices (methods C–F). Serial radiographs were obtained while the balloons were gradually inflated. We measured the time for each preparation and the bubble number, analyzed their distribution in the balloon, and calculated the contrast filling ratio (contrast filling area/total balloon area) for initial and second ballooning. The whole process was repeated three times. RESULTS: The preparation time varied widely (11.5 seconds [method D] to 73.3 seconds [method A]). On initial inflation, the contrast filling ratio at 8 atm was the highest (100%) with methods A and F. On second inflation, the ratio was again highest with method A (99.5%), followed by method F (99.2%). Initial ballooning tended to show a uniform pattern of single bubble in the distal segment of the balloon; in contrast, second ballooning showed varying patterns in which the bubbles were multiple and randomly distributed. CONCLUSION: None of the six methods were able to completely exclude air bubbles from the balloon catheters including the second ballooning; however, the method of repeating aspiration with high-volume inflating device (method F) could be a practical option considering the simplicity and efficiency of preparation.


Subject(s)
Angioplasty , Angioplasty, Balloon , Catheters , Clothing , Embolism, Air , Equipment Failure , Inflation, Economic , Intracranial Arteriosclerosis , Methods , Syringes
8.
Article in English | WPRIM | ID: wpr-765345

ABSTRACT

Epilepsy is one of the major chronic neurological diseases affecting many patients. Resection surgery is the most effective therapy for medically intractable epilepsy, but it is not feasible in all patients. Vagus nerve stimulation (VNS) is an adjunctive neuromodulation therapy that was approved in 1997 for the alleviation of seizures; however, efforts to control epilepsy by stimulating the vagus nerve have been studied for over 100 years. Although its exact mechanism is still under investigation, VNS is thought to affect various brain areas. Hence, VNS has a wide indication for various intractable epileptic syndromes and epilepsy-related comorbidities. Moreover, recent studies have shown anti-inflammatory effects of VNS, and the indication is expanding beyond epilepsy to rheumatoid arthritis, chronic headaches, and depression. VNS yields a more than 50% reduction in seizures in approximately 60% of recipients, with an increase in reduction rates as the follow-up duration increases. The complication rate of VNS is 3–6%, and infection is the most important complication to consider. However, revision surgery was reported to be feasible and safe with appropriate measures. Recently, noninvasive VNS (nVNS) has been introduced, which can be performed transcutaneously without implantation surgery. Although more clinical trials are being conducted, nVNS can reduce the risk of infection and subsequent device failure. In conclusion, VNS has been demonstrated to be beneficial and effective in the treatment of epilepsy and various diseases, and more development is expected in the future.


Subject(s)
Arthritis, Rheumatoid , Brain , Comorbidity , Depression , Drug Resistant Epilepsy , Epilepsy , Equipment Failure , Follow-Up Studies , Headache Disorders , Humans , Seizures , Transcutaneous Electric Nerve Stimulation , Vagus Nerve Stimulation , Vagus Nerve
9.
Article in Chinese | WPRIM | ID: wpr-772500

ABSTRACT

OBJECTIVE@#To explore the high-risk fault risk of CT simulator and the main causes of the risk, and to put forward effective risk management strategies.@*METHODS@#The failure mode and effect analysis method was used to identify and control the operational fault risk of CT simulator.@*RESULTS@#5 major fault components, 8 fault failure models and 17 failure causes were analyzed. The top 5 failure causes are:anode target surface burn caused by direct scanning without warming up the tube (590.4), tube failure (518.2), burnout of joints caused by aging of high voltage cables (424.2), motor carbon brush wear (304.8) and belt break (296.4).@*CONCLUSIONS@#The failure mode and effect analysis method can effectively identify the risk of equipment failure, and thus specifically formulate risk management and control measures to ensure the normal operation of equipment and the safety of doctors and patients.


Subject(s)
Equipment Failure , Humans , Risk Management , Methods , Tomography, X-Ray Computed , Reference Standards
10.
Article in Chinese | WPRIM | ID: wpr-772477

ABSTRACT

OBJECTIVE@#Improve the integrity of the digestive electron microscope equipment and reduce the cost of equipment failure maintenance.@*METHODS@#By studying the composition and function of the digestive electron microscope system and analyzing the causes of common faults, a targeted preventive maintenance plan is developed, equipment users are graded, and a training system is established.@*RESULTS@#The user of the device can skillfully analyze the cause of the malfunction and timely deal with the sudden failure of the diagnosis and treatment, thereby reduce the risk of diagnosis and treatment and the investment in hospital maintenance.@*CONCLUSIONS@#Through the analysis and processing of the digestive electron microscope system, point detection leakage, grading training, preventive maintenance can significantly improve the equipment integrity rate, reduce the risk of clinical diagnosis and treatment, effectively reduce the number of equipment failures, and reduce maintenance costs.


Subject(s)
Equipment Failure , Maintenance and Engineering, Hospital , Microscopy, Electron
11.
Article in English | WPRIM | ID: wpr-764206

ABSTRACT

BACKGROUND AND OBJECTIVES: The purpose of this study was to evaluate the efficacy of revision cochlear implant (CI) surgery for better speech comprehension targeting patients with low satisfaction after first CI surgery. SUBJECTS AND METHODS: Eight patients who could not upgrade speech processors because of an too early CI model and who wanted to change the whole system were included. After revision CI surgery, we compared speech comprehension before and after revision CI surgery. Categoies of Auditory Performance (CAP) score, vowel and consonant confusion test, Ling 6 sounds, word and sentence identification test were done. RESULTS: The interval between surgeries ranged from eight years to 19 years. Same manufacturer’s latest product was used for revision surgery in six cases of eight cases. Full insertion of electrode was possible in most of cases (seven of eight). CAP score (p-value=0.01), vowel confusion test (p-value=0.041), one syllable word identification test (p-value=0.026), two syllable identification test (p-value=0.028), sentence identification test (pvalue=0.028) had significant improvement. Consonant confusion test (p-value=0.063), Ling 6 sound test (p-value=0.066) had improvement but it is not significant. CONCLUSIONS: Although there are some limitations of our study design, we could identify the effect of revision (upgrade) CI surgery indirectly. So we concluded that if patient complain low functional gain or low satisfaction after first CI surgery, revision (device upgrade) CI surgery is meaningful even if there is no device failure.


Subject(s)
Cochlear Implants , Comprehension , Electrodes , Equipment Failure , Humans
12.
Article in English | WPRIM | ID: wpr-788773

ABSTRACT

Epilepsy is one of the major chronic neurological diseases affecting many patients. Resection surgery is the most effective therapy for medically intractable epilepsy, but it is not feasible in all patients. Vagus nerve stimulation (VNS) is an adjunctive neuromodulation therapy that was approved in 1997 for the alleviation of seizures; however, efforts to control epilepsy by stimulating the vagus nerve have been studied for over 100 years. Although its exact mechanism is still under investigation, VNS is thought to affect various brain areas. Hence, VNS has a wide indication for various intractable epileptic syndromes and epilepsy-related comorbidities. Moreover, recent studies have shown anti-inflammatory effects of VNS, and the indication is expanding beyond epilepsy to rheumatoid arthritis, chronic headaches, and depression. VNS yields a more than 50% reduction in seizures in approximately 60% of recipients, with an increase in reduction rates as the follow-up duration increases. The complication rate of VNS is 3–6%, and infection is the most important complication to consider. However, revision surgery was reported to be feasible and safe with appropriate measures. Recently, noninvasive VNS (nVNS) has been introduced, which can be performed transcutaneously without implantation surgery. Although more clinical trials are being conducted, nVNS can reduce the risk of infection and subsequent device failure. In conclusion, VNS has been demonstrated to be beneficial and effective in the treatment of epilepsy and various diseases, and more development is expected in the future.


Subject(s)
Arthritis, Rheumatoid , Brain , Comorbidity , Depression , Drug Resistant Epilepsy , Epilepsy , Equipment Failure , Follow-Up Studies , Headache Disorders , Humans , Seizures , Transcutaneous Electric Nerve Stimulation , Vagus Nerve Stimulation , Vagus Nerve
13.
Arq. bras. oftalmol ; 81(6): 514-516, Nov.-Dec. 2018. graf
Article in English | LILACS | ID: biblio-973851

ABSTRACT

ABSTRACT Although minimally invasive glaucoma surgery using different types of implants is a promising strategy for treating glaucoma, potential long-term complications require further evaluation. Here, we report a case of the anterior chamber displacement of a Xen implant due to a maneuver aimed at correcting a dysfunctional and bent subconjunctival implant.


RESUMO Embora a cirurgia de glaucoma minimamente in vasiva, que usa diferentes tipos de implantes, seja uma estratégia promissora para o tratamento do glaucoma, as possíveis complicações a longo prazo exigem uma avaliação mais aprofundada. Aqui, relatamos um caso de deslocamento da câmara anterior de um implante Xen devido a uma manobra que visa corrigir um implante subconjuntival disfuncional e dobrado.


Subject(s)
Humans , Male , Aged , Postoperative Complications , Ophthalmologic Surgical Procedures/methods , Glaucoma, Open-Angle/surgery , Glaucoma Drainage Implants , Stents , Minimally Invasive Surgical Procedures/methods , Equipment Failure , Anterior Chamber/surgery
15.
Licere (Online) ; 21(3): i:272-f:298, set.2018. ilus
Article in Portuguese | LILACS | ID: biblio-967674

ABSTRACT

Em 2015, São José do Rio Pardo sediou a 59°edição dos Jogos Regionais com um discurso de legado esportivo para a população do município. Essa pesquisa buscou avaliar o legado deixado a partir da manutenção dos equipamentos públicos de lazer esportivo seis meses após o evento mencionado. Trata-se de um estudo qualitativo de campo que cruzou dados de análise documental com visitas in loco aos equipamentos. Ocorreram investimentos e melhorias que poderiam sinalizar um legado esportivo efetivo e um incentivo às práticas de lazer. Entretanto, ao visitar os locais, percebe-se que o poder público municipal não desempenhou atividades de manutenção básica. Em alguns casos, como na pista de BMX, acredita-se estar mais próximo do "largado" esportivo devido ao estado de abandono, deterioração e falta de manutenção adequada. Sediar eventos dessa magnitude pode contribuir para o incentivo à prática esportiva, desde que o poder público continue a desenvolver políticas e leis de incentivo voltadas ao setor.


In 2015, São José do Rio Pardo City hosted the 59th Regional Games with a sports legacy address for citizenship. The present research sought to evaluate the legacy left from the maintenance of public sports leisure equipment six months after the event mentioned. This is a qualitative field study that crossed documentary analysis data with on-site visits to the equipment. The investments and improvements made could signal a sporting legacy and an incentive to leisure practices. However, when visiting the sites, it is noticed that the municipal public power did not perform basic maintenance activities. Some places are closer to "sportive abandonment" and deterioration due public neglect. Here we can mention the BMX racing track, for example. To host events of the Regional Games magnitude can contribute to the incentive to sports practice as long as the public power continues to develop policies and incentive rules aimed at the sector.


Subject(s)
Humans , Play and Playthings , Public Policy , Equipment Maintenance , Municipal Management , Sports Equipment , Equipment Failure , Games, Recreational , Equipment and Supplies Utilization , Leisure Activities , Local Government
16.
Rev. bras. enferm ; 71(4): 1832-1840, Jul.-Aug. 2018.
Article in English | LILACS, BDENF | ID: biblio-958688

ABSTRACT

ABSTRACT Objectives: To identify equipment failures during handling by nurses and analyze the conduct of the professionals when these failures occur. Methods: Descriptive, exploratory and qualitative study, whose field was the intensive care unit of a public institution, and the participants were day nurses that worked providing direct care to patients. Data were produced in 2014 through systematic observation and interviews and were examined with thick description and content analysis. Results: The outcomes evinced the inadequate functioning of infusion bombs, users' errors related to the design of equipment and problems with batteries of artificial fans. These failures related to the management of equipment in the unit. Final considerations: It is necessary to strengthen the monitoring systems of safety conditions of equipment in intensive nursing care to prevent incidents.


RESUMEN Objetivo: Identificar las fallas de equipos mientras son utilizados por enfermeros, y analizar sus conductas ante tales fallas. Método: Estudio descriptivo-exploratorio, cualitativo, realizado en la Unidad de Terapia Intensiva de una institución pública. Participaron enfermeros de turno diurno, actuantes en la atención directa del paciente. Los datos fueron obtenidos en el año 2014 a través de observación sistemática y entrevista. Posteriormente, fueron sometidos a análisis por descripción densa y de contenido. Resultados: Se evidenció funcionamiento inadecuado de bombas de infusión, errores del usuario relacionados al diseño del equipo, problemas con baterías de ventiladores artificiales. Las fallas identificadas están relacionadas a la gestión de los equipos de la unidad. Consideraciones finales: Es necesario fortalecer los sistemas de vigilancia en las condiciones de seguridad de equipos en el cuidado intensivo de enfermería, a fin de prevenir la ocurrencia de incidentes.


RESUMO Objetivo: Identificar as falhas dos equipamentos durante o seu manejo pelo enfermeiro e analisar suas condutas diante de tais falhas. Método: Pesquisa descritivo-exploratória, qualitativa, cujo campo foi a Unidade de Terapia Intensiva de uma instituição pública, e os participantes, enfermeiros diurnos atuantes na assistência direta ao paciente. Os dados foram produzidos no ano de 2014, por meio de observação sistemática e entrevista, e posteriormente submetidos a análise por descrição densa e de conteúdo. Resultados: Evidenciaram-se o funcionamento inadequado de bombas infusoras, os erros do usuário relacionados ao desenho do equipamento e problemas com baterias de ventiladores artificiais. Essas falhas identificadas têm relação com a gestão dos equipamentos da unidade. Considerações finais: É preciso fortalecer os sistemas de vigilância das condições de segurança dos equipamentos no cuidado intensivo de enfermagem, a fim de se prevenir a ocorrência de incidentes.


Subject(s)
Humans , Medical Errors/nursing , Equipment Failure , Patient Safety/standards , Nurses/psychology , Qualitative Research , Nurses/standards
17.
Rev. SOBECC ; 23(2): 69-76, abr.-jun.2018.
Article in Portuguese | BDENF, LILACS | ID: biblio-909063

ABSTRACT

Objetivo: Identificar as implicações da não manutenção dos equipamentos hospitalares na qualidade do atendimento cirúrgico. Método: Trata-se de uma pesquisa quantitativa, exploratória, descritiva, observacional, realizada em um hospital filantrópico do interior de Minas Gerais. Aplicou-se a técnica de observação direta e a avaliação de registros de manutenção preventiva e corretiva dos equipamentos cirúrgicos. Resultados: Durante o período de observação, verificou-se que os equipamentos que mais apresentaram falhas durante a cirurgia foram: bisturi elétrico, intensificador e foco cirúrgico. Os dados de funcionalidade e manutenção dos equipamentos foram comparados com recomendações do fabricante e com a literatura científica. Conclusão: A não manutenção dos equipamentos cirúrgicos pode prolongar a recuperação pós-operatória, aumentar a morbidade e a mortalidade e levar a um impacto financeiro desnecessário para a instituição. Espera-se que os resultados deste estudo possam motivar a equipe multiprofissional à realização da manutenção preventiva dos equipamentos antes das cirurgias.


Objective: To identify the implications of non-maintenance of hospital equipment for the quality of surgical care. Method: This is a quantitative, exploratory, descriptive, observational study carried out at a philanthropic hospital in the countryside of Minas Gerais. The technique of direct observation was applied, as well as the evaluation of records related to preventive and corrective maintenance of surgical equipment. Results: During the observation period, the equipment presenting most failures during surgical procedures were: electric scalpel, intensifier, and surgical focus. Equipment functionality and maintenance data were compared with manufacturers' recommendations and the scientific literature. Conclusion: Failure in surgical equipment maintenance can prolong patients' postoperative recovery, increase morbidity and mortality, and lead to unnecessary financial impact for the institution. It is hoped that the results of this study motivate the multiprofessional team to perform preventive maintenance of equipment before surgeries.


Objetivo: Identificar las implicaciones del no mantenimiento de los equipos hospitalarios en la calidad de la atención quirúrgica. Método: Se trata de un estudio observacional, descriptivo, exploratorio y cuantitativo realizado en un hospital filantrópico del interior de Minas Gerais. Se aplicó la técnica de observación directa y la evaluación de registros de mantenimiento preventivo y correctivo de los equipos quirúrgicos. Resultados: Durante el período de observación, se verificó que los equipos que presentaron el mayor número de fallas durante la cirugía fueron: bisturí eléctrico, intensificador y foco quirúrgico. La funcionalidad del equipo y los datos de mantenimiento se compararon con las recomendaciones del fabricante y la literatura científica. Conclusión: La falta de mantenimiento del equipo quirúrgico puede prolongar la recuperación postoperatoria, aumentar la morbilidad y la mortalidad y generar un impacto financiero innecesario para la institución. Se espera que los resultados de este estudio motiven al equipo multiprofesional a realizar el mantenimiento preventivo del equipo antes de las cirugías


Subject(s)
Humans , Calibration , Preventive Maintenance , Equipment Failure , Surgical Equipment , Evaluation Studies as Topic , Mentoring
19.
J. appl. oral sci ; 26: e20180144, 2018. graf
Article in English | LILACS, BBO | ID: biblio-954493

ABSTRACT

Abstract Objective The aim of this study was to evaluate the influence of torsional preloading on the cyclic flexural fatigue resistance of thermally treated NiTi instruments. Material and Methods Ten new instruments New Hyflex CM (HF 30.06; Coltene/Whaladent Inc.), Typhoon CM (TYP 30.06; Clinician's Choice Dental Products) and Vortex Blue (VB 30.06; Dentsply Tulsa Dental) were chosen, based on geometry and specific characteristics of the manufacturing process. The new instruments of each system were tested in a bench device to determine their fatigue resistance through mean value of number of cycles to failure (Nf) (Control Group - CG). Another group of 10 new HF, TYP and VB instruments were submitted to 20 cycles of torsional straining between 0° and 180° (Experimental Group - EG) and then submitted to fatigue until rupture under the same conditions of the CG. Tested instruments were examined by scanning electron microscopy (SEM). Data were analyzed using one-way analysis of variance and post hoc Tukey's test (α=.05). Results Higher fatigue resistance was accomplished by HF instruments, followed by VB and TYP (p<0.05). During the torsional preloading, the lowest mean torque value was observed for TYP instruments (p<0.05). The torsional preload caused a significant reduction in the Nf values (p<0.05) of about 20%, 39% and 45% for instruments HF, VB and TYP, respectively. Longitudinal cracks, generated during the torsional preloading, were present in VB files, but were not observed in the CM instruments (HF and TYP). Conclusions In conclusion, the flexural fatigue resistance of thermally treated instruments is diminished after cyclic torsional loading.


Subject(s)
Titanium/chemistry , Dental Instruments/standards , Equipment Design/methods , Equipment Failure , Torsion, Mechanical , Nickel/chemistry , Reference Values , Rotation , Stress, Mechanical , Surface Properties , Temperature , Time Factors , Materials Testing , Microscopy, Electron, Scanning , Reproducibility of Results , Pliability , Root Canal Preparation/instrumentation
20.
Article in Chinese | WPRIM | ID: wpr-775552

ABSTRACT

This article elaborates electromagnetic compatibility of medical electrical equipment and the regulatory tests based on related standards. And elaborating the diversity and the necessity of rectification by specific cases and deeply discussing and summing up for improving the compatibility of medical electrical equipment.


Subject(s)
Electricity , Electromagnetic Fields , Equipment Failure , Equipment and Supplies
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