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Systematic review and meta-analysis of surgical suture strength according to the type, structure and geometry of suture materials

100%

Andryszczyk M. , Topoliński T.

tom Vol. 23, no. 4

191--200

Purpose: As a rule, wound healing is a natural and spontaneous process. However, in acute or surgical wounds, the wound edges need to be approximated and held together by artificial means. Surgery within the abdominal cavity or elsewhere almost always involves cutting through the skin, after which a medical procedure is conducted, followed by wound closure. The suture provides temporary mechanical support during the natural healing process of the affected tissues. Not only does it stimulate the primary wound healing, but also provides mechanical protection against wound dehiscence. Methods: This analysis is intended to juxtapose the basic factors that contribute to a change in suture strength and the possible failure of surgical sutures, which may affect the wound healing process and increase the risk of postoperative complications. Results: The preliminary search criteria used in the databases included keywords such as: “strength of suture materials”, “strength of surgical sutures”, “surgical knot strength”. Five key articles were ultimately selected from a pool of 336 articles first identified based on these search criteria. Next, a meta-analysis of the literature data was performed, taking into account factors such as the type of suture materials used, biological conditions and model conditions used in research, having a significant impact on the mechanical properties of surgical sutures. Conclusions: This comparison revealed considerable variations in the suture strength between different sutures of the same size, it also demonstrated that the decrease in suture strength strongly depends on the finished suture and the thread type.

Assessment of Different Methods for Cutting Composites Used in Unmanned Air Vehicles

80%

Szala G. , Andryszczyk M. , Wirwicki M. S.

tom Vol. 18, no 5

The goal of this study is to determine the effect of cutting methods on the edges of selected materials applied in structural elements and floor sheathing of unmanned air vehicles. Three cutting methods for MGS L285 epoxy resin composites used for production of unmanned air vehicles manufactured in one of the European companies have been presented. Composites reinforced by glass and aramid fibers are approved for certified production of air vehicle elements (AMC-20). Cutting was applied to each material using a different technology such as: milling, laser cutting and abrasive water jet cutting. The authors focus on the edge quality of the tested specimens cut by various methods. Quality assessment was based on electronic microscopic scanning images and measurement of the specimen maximum damage. In summary, the choice of an appropriate composite cutting method depends on the type of material and its parameters, and it is crucial for the quality of the machined product. The authors focus on determining the selection of parameters for chosen cutting methods and materials used in the military unmanned aerial vehicle industry. Among the conducted tests, the results indicate that better cutting effects are obtained for milling methods in the case of GFRP+L285 (0.143±0.073 µm) and CFRP+L285 (0.072±0.027 µm), and the worst for AFRP+L285 (0.831±0.269 µm). The water jet method gives the worst results in the cutting zone (results above 0.224 µm).