Prof. Giorgio Colombo Profile

Prof. Giorgio Colombo

at Politecnico di Milano

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Proceedings Article | 27 January 2006 Paper

Reverse engineering and rapid prototyping techniques to innovate prosthesis socket design

Giorgio Colombo, Massimiliano Bertetti, Daniele Bonacini, Grazia Magrassi

Proceedings Volume 6056, 60560P (2006) https://doi.org/10.1117/12.644175

KEYWORDS: 3D modeling, Reverse modeling, Magnetic resonance imaging, 3D acquisition, Bone, Computed tomography, Skin, Laser cutting, Reverse engineering, Tissues

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The paper presents an innovative approach totally based on digital data to optimize lower limb socket prosthesis design. This approach is based on a stump's detailed geometric model and provides a substitute to plaster cast obtained through the traditional manual methodology with a physical model, realized with Rapid Prototyping technologies; this physical model will be used for the socket lamination. The paper discusses a methodology to reconstruct a 3D geometric model of the stump able to describe with high accuracy and detail the complete structure subdivided into bones, soft tissues, muscular masses and dermis. Some different technologies are used for stump acquisition: non contact laser technique for external geometry, CT and MRI imaging technologies for the internal structure, the first one dedicated to bones geometrical model, the last for soft tissues and muscles. We discuss problems related to 3D geometric reconstruction: the patient and stump positioning for the different acquisitions, markers' definition on the stump to identify landmarks, alignment's strategies for the different digital models, in order to define a protocol procedure with a requested accuracy for socket's realization. Some case-studies illustrate the methodology and the results obtained.

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