Ciencias Exactas y Ciencias de la Salud
Permanent URI for this collectionhttps://hdl.handle.net/11285/551039
Pertenecen a esta colección Tesis y Trabajos de grado de las Maestrías correspondientes a las Escuelas de Ingeniería y Ciencias así como a Medicina y Ciencias de la Salud.
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- Semiresorbable orthopedic implant design based on nitinol and magnesium alloy(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2024-12) Grijalva Pazos, Héctor Jesús; Rodríguez Gonzalez, Ciro Ángel; emipsanchez; Cedeño Viveros, Luis Daniel; School of Engineering and Sciences; Campus Monterrey; García López, ErikaThis project focuses on developing and evaluating a novel orthopedic implantprototype, which combines magnesium-calcium and nitinol through a micro laser welding process. The primary objective is to create a biocompatible, biodegradable scaffold for orthopedic applications, offering an alternative to traditional implants. A series of welding experiments were conducted using a PRECO laser welding machine, where different welding parameters, including laser power and exposure time, were tested to optimize the microhardness and mechanical properties of the welds. The simulation and experimental results were compared to validate the design choices and ensure the scaffold's structural integrity. The microhardness tests indicated that the best results were achieved with 200 watts of power and 18 ms exposure time, creating a prototype scaffold for further testing. Future work includes optimizing scaffold designs and conducting compression and degradation tests to evaluate the implant's mechanical performance and corrosion resistance in physiological conditions. This project aims to contribute to developing advanced, sustainable orthopedic implants with improved performance and biocompatibility.
- Characterization of additively manufactured SS316L lattice geometries for lumbar interbody fusion cage application(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2020-12-08) Fraga Martínez, Antonio Abraham; Rodríguez González, Ciro Angel; qro /|bqrotbecerra/tolmquevedo; García López, Erika; López Botello, Omar Eduardo; Escuela de Ingeniería y Ciencias; Campus MonterreyThe Additive Manufacturing provides the capability of fabricate solid and hollow structures. Selective Laser Melting, an additive manufacturing technique, uses a powder bed and a laser melts the powder according to a trajectory needed to generate a 2D layer, then another layer of powder is distributed, and this layer is melted. This process is repeated, and the result is a 3D piece made of 2D layers. Hollow structures can be created reducing the material volume fraction and allowing to have desired mechanical properties for a specific behavior of a piece. For orthopedic implants, hollow pieces allow matching the mechanical properties of the implant to the ones of the surrounding tissue where it is pretended to be placed. Lattice structure are a kind of hollow structures used in many fields, including the health one. In this work, lattice structure cylinders with three different lattice structure (Body centered cubic, Body centered hexagonal and Tetrahedron) of two different unit cell sizes (3x3x3 and 6x6xx mm) with a strut diameter set as 800 µm were fabricated in SS316L using SLM technique and submitted to compression test to be characterized mechanically in order to know their mechanical behavior. Considering the Young’s modulus of the different arrangements, the Tetrahedron lattice structure with a unit cell size of 3x3x3 mm and the same strut diameter was selected to create a lumbar interbody fusion cage, and another unit cell size of 4x4x4 mm was proposed to study with this same geometry. These lumbar cages achieved a Young’s modulus near to the vertebrae cortical and trabecular bone, allowing the correct transmission of loads. For future work, it is proposed to replicate these experiments with Nitinol powder, a biocompatible and biomechanically compatible alloy.
