مريم پاشاپورحاجي عليلو

Surgical staples are widely used in gastrointestinal surgeries. Currently, surgical staples composed of non-biodegradable titanium, which can cause allergic reactions and interfere with imaging. Another problem with using non-biodegradable staples is the need for a secondary operation to remove them after the wound has healed. By making biodegradable staples with good mechanical properties, there is no need to remove the staples and wound will heals with minimal complication. Since the performance of staples depends on the design and material, in the current research, the effect of staple design on stress and strain, which is one of the important factors in the corrosion of staples, has been investigated. First, new models for staples made of AZ31 were designed and analyzed using Ansys software, and then the stress corrosion of the proper model was characterized by immersion tests in simulated colon fluid (SCF) and the temperature of 37°C. In the proposed models, the effect of reducing the angle of the legs and the bending points in the corners of the staple was eva‎luated. In order to investigate the corrosion behavior of the areas under stress in staples, physical simulation was used to create same stress on the sheet.The samples were shaped using a mold and immersed in SCF and their degradation behavior was investigated at 1, 2, 4 and 8 weeks. The results of finite element analysis showed that the staple with bending points in the crown and an angle less than 90 degrees showed a lower stress and strain distribution. Also, the immersion results showed that the corrosion of the samples was low in the first 2 weeks and the deposition of corrosion products on the surface increased the corrosion resistance. In the 4th week of corrosion, the corrosion products started to break down and in the 8th week we saw pitting corrosion on the surface of the sample, which shows the potential of AZ31 as intestinal surgical staples.

آلياژ منيزيوم AZ31 , منگنه هاي جراحي , منگنه هاي تخريب پذير , آناستوموز روده , خوردگي

magnesium alloy AZ31 , Surgical Staples , biodegradable staples , intestinal anastomosis , corrosion

Maryam Pashapoor

Dr. Alireza Ivani