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Surface treatment for medical devices: Analysis of coating materials in High-Frequency surgery instruments
Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Electric burn and tissue sticking are two major concerns in electrosurgery. The improvement of the surgical instrumentation to avoid these two problems could be achieved by surface treatment. A material selection criteria was used to assist with the selection of suitable candidates to be use as coating material in order to improve the performance of the stainless steel as the current state-of-the-art material in electrosurgery instruments. Two target surfaces were chosen to be coated: inner and outer surface. The inner surface requires a conductive material with a non-stick capability. The outer surface requires an electrical insulation coating easy to clean. TiN, AlN, CrN, and Al2O3 were selected as candidates for the inner surface, while Parylene and ZrO2 were selected for the outer surface. Four research questions guided the investigation to determine the coating materials with the best performance, to assess the characterization techniques, and to evaluate eventual impact of the coating on the thermal spread. An active coated rectangular electrode was connected to a HF-unit in the bipolar cut mode and introduced to an organic testing gel to simulate electrosurgery conditions. A fully coated squared sample was tested to determine the voltage peak of the electric breakdown. The results of the present study reveal that TiN and Al2O3 improved the performance of the sample, when compared to the stainless steel and should assure the non-stick behavior. Both Parylene and ZrO2 failed to provide a continuous electrical insulation. Two new methods of testing that performs closer to real conditions were suggested as an improvement of the existing measurement technics. Moreover, a relationship between the coating and the thermal spread was identified and proposed as a mechanism that enhances tissue adhesion. 

Place, publisher, year, edition, pages
2016. , 121 p.
Keyword [en]
Non-stick • Insulator • Coating • Electrosurgery • High-frequency • Material characterization • Surface modification • Tissue sticking
National Category
Manufacturing, Surface and Joining Technology
URN: urn:nbn:se:hj:diva-30514ISRN: JU-JTH-PRU-2-20160040OAI: diva2:936521
Subject / course
JTH, Product Development
2016-06-10, JTH 2306, Jönköping, 13:45 (English)
Available from: 2016-06-16 Created: 2016-06-14 Last updated: 2016-06-16Bibliographically approved

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