Synthesis of passive lightweight orthoses considering humanmachine interaction

Steck, Patrick; Scherb, David; Miehling, Jörg; Völkl, Harald; Wartzack, Sandro

doi:10.35199/dfx2022.11

Cited by 7 publications

(6 citation statements)

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“…Further studies that examined the abrasive behavior and the maximum bending strength of reinforced polyethylene terephthalate glycol (PETG) were published by Hriţuc et al [31] and Lancea et al [32]. Finally, Steck et al [33] described a methodic approach for designing passive lightweight orthoses incorporating human-machine interactions.…”

Section: State Of the Artmentioning

confidence: 99%

Design and Additive Manufacturing of a Passive Ankle–Foot Orthosis Incorporating Material Characterization for Fiber-Reinforced PETG-CF15

et al. 2023

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The individualization of patient-specific ankle joint orthoses is becoming increasingly important and can be ideally realized by means of additive manufacturing. However, currently, there are no functional additively manufactured fiber-reinforced products that are used in the field of orthopedic treatment. In this paper, an approach as to how additively manufactured orthopedic products can be designed and produced quickly and flexibly in the future is presented. This is demonstrated using the example of a solid ankle–foot orthosis. For this purpose, test results on PETG-CF15, which were determined in a previous work, were integrated into a material map for an FEA simulation. Therewith, the question can be answered as to whether production parameters that were determined at the test specimen level can also be adapted to real, usable components. Furthermore, gait recordings were used as loading conditions to obtain exact results for the final product. In order to perfectly adapt the design of the splint to the user, a 3D scan of a foot was performed to obtain a perfect design space for topology optimization. This resulted in a patient-specific and stiffness-optimized product. Subsequently, it was demonstrated that the orthosis could be manufactured using fused layer modelling. Finally, a comparison between the conventional design and the consideration of AM-specific properties was made. On this basis, it can be stated that the wearing comfort of the patient-specific design is very good, but the tightening of the splint still needs to be improved.

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Section: State Of the Artmentioning

confidence: 99%

Design and Additive Manufacturing of a Passive Ankle–Foot Orthosis Incorporating Material Characterization for Fiber-Reinforced PETG-CF15

et al. 2023

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“…In the first step, with the help of user-centred and lightweight design specific methods, the classical design methodology according to Pahl/Beitz is applied to plan and design an AFO [1] (Pahl et al, 2007;Miehling, 2019). The contents of the applied conceptual design methods such as requirements list, black box, structural tree as well as the exact selection of the active principles were previously published by the authors (Steck et al, 2022). Subsequently, the pre-sketched orthosis is manually transformed into a 2D truss [2] and pre-dimensioned in a two-dimensional truss FEA (Andreas Dutzler, 2022) based on the Python package TrussPy, i.e.…”

Section: Methodsmentioning

confidence: 99%

A New Design Method for Generating Surrogate Kinematic Truss Orthoses to Support Pathological Gait Patterns in Human Model Simulations

et al. 2023

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With increasing life expectancy, the risk of diseases of the central nervous system, such as cancer, strokes, etc., also increases. Strokes often result in injury to the sciatic nerve, which is responsible for controlling the calf muscles (plantar and dorsal flexors). A so-called ankle joint orthosis (AFO) helps to support the pathological gait and to avoid foot drop during gait. Passive orthoses are of particular importance for research, as they do not require additional incoming energy from outside to the orthotic system. However, current passive orthoses are often not personalized. On the one hand, because they usually have only a temporary muscle-building function and, on the other hand, because the individual design process is computationally time consuming and thus expensive. This paper presents a possibility to pre-dimension and pre-design passive orthoses fast and cost-efficiently by reducing the complexity of the model based on volume-optimized truss elements. Therefor a traditional high calculation intensive design procedure is compared with the complexity reduced model to show its effectiviness and the similarity of the results.

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“…Thus, a newly developed concept for a passive AFO being able to support both ankle rotational directions is currently in work (Scherb et al, 2022b). The passive AFO should be designed to consider lightweight as well as user-centered design requirements (Steck et al, 2022). On the one hand, the technical realization of the AFO and its necessary components has to be developed.…”

Section: Introductionmentioning

confidence: 99%

A New Method for Passive Ankle Foot Orthosis Design – Integration of Musculoskeletal and Finite Element Simulation

et al. 2023

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Motor disorders are diseases affecting the muscle function of the human body. A frequently occurring motor disorder affects the lower leg muscles resulting in a pathological gait called foot drop. Patients have a higher risk of stumbling and falling. The most common treatment is the use of a passive ankle-foot-orthosis (AFO). However, the compensation of foot drop is only limited due to the non possible support of all rotational directions of the ankle joint. Therefore, a newly developed concept for a passive AFO is currently in work. To ensure a best possible treatment of the patient, the provided support by the AFO and required support by the patient have to be in accordance. Thus, in this contribution a method is presented that integrates model order reduced finite element analysis for computing the provided support of the AFO and musculoskeletal human models for representing the patients' gait behaviour. With the method, the design of the force generating structures of the AFO can be realized regarding the patients' requirements. The presented method is further evaluated with a specific use case. The main focus lies here in the principal functionality of the method and the provision of valid results.

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Synthesis of passive lightweight orthoses considering humanmachine interaction

Cited by 7 publications

References 0 publications

Design and Additive Manufacturing of a Passive Ankle–Foot Orthosis Incorporating Material Characterization for Fiber-Reinforced PETG-CF15

Design and Additive Manufacturing of a Passive Ankle–Foot Orthosis Incorporating Material Characterization for Fiber-Reinforced PETG-CF15

A New Design Method for Generating Surrogate Kinematic Truss Orthoses to Support Pathological Gait Patterns in Human Model Simulations

A New Method for Passive Ankle Foot Orthosis Design – Integration of Musculoskeletal and Finite Element Simulation

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