Design and Analysis of Orthogonally Compliant Features for Local Contact Pressure Relief in Transtibial Prostheses

Faustini, Mario; Crawford, Richard H.; Neptune, Richard R.; Rogers, William E.; Bosker, Gordon

doi:10.1115/1.2049331

Cited by 32 publications

(19 citation statements)

References 10 publications

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“…Some researchers however, have proposed compliant socket designs to offer relief in vulnerable regions, such as near bony protrusions. For instance by varying the socket wall thickness and by introducing deformable structures [19], by introducing a variable spacing between a flexible inner and rigid outer socket [20], and finally by spatially varying the elastic material properties of the socket [21]. The preliminary findings of the latter study were reduced contact pressures for a compliant socket compared to a conventional socket.…”

Section: Introductionmentioning

confidence: 65%

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Automated and Data-driven Computational Design of Patient-Specific Biomechanical Interfaces

Moerman¹,

Sengeh²,

Herr³

2016

Preprint

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Abstract-Biomechanical interfaces are mechanical structures that form the connection between a device and a tissue region, and, through appropriate load transfer, aim to minimize tissue discomfort and injury. A patient-specific and data-driven computational framework for the automated design of biomechanical interfaces is presented here. Optimization of the design of biomechanical interfaces is complex since it is affected by the interplay of the geometry and mechanical properties of both the tissue and the interface. The proposed framework is presented for the application of transtibial amputee prostheses where the interface is formed by a prosthetic liner and socket. Conventional socket design and manufacturing is largely artisan, non-standard, and insufficiently data-driven, leading to discrepancies between the quality of sockets produced by different prosthetists. Furthermore, current prosthetic liners are often not patient-specific. The proposed framework involves: A) non-invasive imaging to record patient geometry, B) indentation to assess tissue mechanical properties, C) data-driven and automated creation of patientspecific designs, D) patient-specific finite element analysis (FEA) and design evaluation, and finally E) computer aided manufacturing. Uniquely, the FEA procedure controls both the design and mechanical properties of the devices, and simulates, not only the loading during use, but also the pre-load induced by the donning of both the liner and the socket independently. Through FEA evaluation, detailed information on internal and external tissue loading, which are directly responsible for discomfort and injury, are available. Further, these provide quantitative evidence on the implications of design choices, e.g. : 1) alterations in the design can be used to locally enhance or reduce tissue loading, 2) compliant features can aid in relieving local surface pressure. The proposed methods form a patient-specific, data-driven and repeatable design framework for biomechanical interfaces, and by enabling FEA-based optimization reduces the requirement for repeated patient involvement in the currently manual and iterative design process.

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Section: Introductionmentioning

confidence: 65%

“…Modelling of functional use often simply consists of the application of force (e.g. [19]) or displacement (e.g. [42]) boundary conditions (e.g.…”

Section: Introductionmentioning

confidence: 99%

Automated and Data-driven Computational Design of Patient-Specific Biomechanical Interfaces

Moerman¹,

Sengeh²,

Herr³

2016

Preprint

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“…In this study, pressure transducers were integrated in the spiral compliant areas. In comparison to non-compliant sockets, the compliant socket reduced the average pressure by 20% and the peak pressure by 23-45% [39]. A follow-up study on the socket with variably compliant design had the subject acclimate to all the sockets at the time of testing and showed significant reduction in contact pressure [44].…”

Section: Traditional and Additive Manufacturing Of The Foot Orthosismentioning

confidence: 97%

“…In 2005, the UT group advanced the design of prosthetic sockets by incorporating compliant features using topology optimization to relieve contact pressure [39]. In this study, pressure transducers were integrated in the spiral compliant areas.…”

Section: Traditional and Additive Manufacturing Of The Foot Orthosismentioning

confidence: 99%

Additive manufacturing of custom orthoses and prostheses—A review

Chen

Wensman

et al. 2016

Additive Manufacturing

207

145

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“…A more sophisticated design has been incorporated for better control of flexibility (Faustini et al 2005).…”

mentioning

confidence: 99%

Advanced Trans-Tibial Socket Fabrication Using Selective Laser Sintering

Rogers

Bosker

Crawford

et al. 2007

Prosthetics &Amp; Orthotics International

Self Cite

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There have been a variety of efforts demonstrating the use of solid freeform fabrication (SFF) for prosthetic socket fabrication though there has been little effort in leveraging the strengths of the technology. SFF encompasses a class of technologies that can create three dimensional objects directly from a geometric database without specific tooling or human intervention. A real strength of SFF is that cost of fabrication is related to the volume of the part, not the part's complexity. For prosthetic socket fabrication this means that a sophisticated socket can be fabricated at essentially the same cost as a simple socket. Adding new features to a socket design becomes a function of software. The work at The University of Texas Health Science Center at San Antonio (UTHSCSA) and University of Texas at Austin (UTA) has concentrated on developing advanced sockets that incorporate structural features to increase comfort as well as built in fixtures to accommodate industry standard hardware. Selective laser sintering (SLS) was chosen as the SFF technology to use for socket fabrication as it was capable of fabricating sockets using materials appropriate for prosthetics. This paper details the development of SLS prosthetic socket fabrication techniques at UTHSCSA/UTA over a six-year period.

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Design and Analysis of Orthogonally Compliant Features for Local Contact Pressure Relief in Transtibial Prostheses

Cited by 32 publications

References 10 publications

Automated and Data-driven Computational Design of Patient-Specific Biomechanical Interfaces

Automated and Data-driven Computational Design of Patient-Specific Biomechanical Interfaces

Additive manufacturing of custom orthoses and prostheses—A review

Advanced Trans-Tibial Socket Fabrication Using Selective Laser Sintering

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