Design of manikin for testing of residual-limb shape capture-method: Technical note

McGarry, Anthony; McHugh, B.; Duers, Jake; Buis, Arjan

doi:10.1682/jrrd.2010.06.0113

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…This makes introducing new materials difficult, as it is difficult to draw comparisons against traditional materials. It is not clear whether digital scanning is as accurate as traditional techniques [50] and the relationship between socket fit and comfort remains unclear [20]. Additionally, digital methods are not required to be taught at P&O centres under ISPO guidance [33] posing challenges for translating research into clinical practice.…”

Section: Safety and Legality Concernsmentioning

confidence: 99%

3D-Printing and Upper-Limb Prosthetic Sockets: Promises and Pitfalls

Olsen

Day

Dupan

et al. 2021

IEEE Trans. Neural Syst. Rehabil. Eng.

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Modernising the way upper-limb prosthetic sockets are made has seen limited progress. The casting techniques that are employed in clinics today resemble those developed over 50 years ago and there is still a heavy reliance on manual labour. Modern manufacturing methods such as 3D scanning and printing are often presented as ready-to-use solutions for producing low-cost functional devices, with public perceptions being largely shaped by the superficial media representation and advertising. The promise is that modern socket manufacturing methods can improve patient satisfaction, decrease manufacturing times and reduce the workload in the clinic. However, the perception in the clinical community is that total conversion to digital methods in a clinical environment is not straightforward. Anecdotally, there is currently a disconnect between those developing technology to produce prosthetic devices and the actual needs of clinicians and people with limb difference. In this paper, we demonstrate strengths and drawbacks of a fully digitised, low-cost trans-radial diagnostic socket making process, informed by clinical principles. We present volunteer feedback on the digitally created sockets and provide expert commentary on the use of digital tools in upper-limb socket manufacturing. We show that it is possible to utilise 3D scanning and printing, but only if the process is informed by expert knowledge. We bring examples to demonstrate how and why the process may go wrong. Finally, we provide discussion on why progress in modernising the manufacturing of upper-limb sockets has been slow yet it is still too early to rule out digital methods.

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Section: Safety and Legality Concernsmentioning

confidence: 99%

3D-Printing and Upper-Limb Prosthetic Sockets: Promises and Pitfalls

Olsen

Day

Dupan

et al. 2021

IEEE Trans. Neural Syst. Rehabil. Eng.

View full text Add to dashboard Cite

show abstract

“…This makes introducing new materials difficult, as it is difficult to draw comparisons against traditional materials. It is not clear whether digital scanning is as accurate as traditional techniques [22] and the relationship between socket fit and comfort remains unclear [39]. Additionally, digital methods are not required to be taught at P&O centres under ISPO guidance [16] posing challenges for translating research into clinical practice.…”

Section: Safety and Legality Concernsmentioning

confidence: 99%

3D-Printing and upper-limb prosthetic sockets; promises and pitfalls

Olsen

Day

Dupan

et al. 2020

Preprint

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Modernising the way upper-limb prosthetic sockets are made has seen limited progress. The casting techniques that are employed in clinics today resemble those developed over 50 years ago and there is still a heavy reliance on manual labour. Modern manufacturing methods such as 3D scanning and printing are often presented as ready-to-use solutions for producing low-cost functional devices, with public perceptions being largely shaped by the superficial media representation and advertising. The promise is that modern socket manufacturing methods can improve patient satisfaction, decrease manufacturing times and reduce the workload in the clinic. However, the perception in the clinical community is that total conversion to digital methods in a clinical environment is not straightforward. Anecdotally, there is currently a disconnect between those developing technology to produce prosthetic devices and the actual needs of clinicians and people with limb difference. In this paper, we demonstrate strengths and drawbacks of a fully digitised, low-cost trans-radial diagnostic socket making process, informed by clinical expertise. We present volunteer feedback on the digitally created sockets and provide expert commentary on the use of digital tools in upper-limb socket manufacturing. We show that it is possible to utilise 3D scanning and printing, but only if the process is informed by expert knowledge. We bring examples to demonstrate how and why the process may go wrong. Finally, we provide discussion on why progress in modernising the manufacturing of upper-limb sockets has been slow yet it is still too early to rule out digital methods.

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“…[17][18][19] The use of silicone has also been proven successful for simulating tissue while maintaining constant volume 20 and thus has been used to develop residuum limb manikins. 21 There are also practical advantages of using silicone as opposed to biological materials, such as animal flesh or cadaveric residuum, which would need to be preserved. In addition, silicone can be easily moulded to comply with the complex shapes of the truncated bones and residuum, thus reproducibly simulating the real scenario of the residuum/socket interface.…”

Section: Simulator Developmentmentioning

confidence: 99%

Development of a residuum/socket interface simulator for lower limb prosthetics

Mcgrath

Gao

Tang

et al. 2017

Proc Inst Mech Eng H

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Mechanical coupling at the interface between lower limb residua and prosthetic sockets plays an important role in assessing socket fitting and tissue health. However, most research lab-based lower limb prosthetic simulators to-date have implemented a rigid socket coupling. This study describes the fabrication and implementation of a lower limb residuum/ socket interface simulator, designed to reproduce the forces and moments present during the key loading phases of amputee walking. An artificial residuum made with model bones encased in silicone was used, mimicking the compliant mechanical loading of a real residuum/socket interface. A 6-degree-of-freedom load cell measured the overall kinetics, having previously been incorporated into an amputee's prosthesis to collect reference data. The developed simulator was compared to a setup where a rigid pylon replaced the artificial residuum. A maximum uniaxial load of 850 N was applied, comparable to the peak vertical ground reaction force component during amputee walking. Load cell outputs from both pylon and residuum setups were compared. During weight acceptance, when including the artificial residuum, compression decreased by 10%, while during push off, sagittal bending and anterior-posterior shear showed a 25% increase and 34% decrease, respectively. Such notable difference by including a compliant residuum further highlighted the need for such an interface simulator. Subsequently, the simulator was adjusted to produce key load cell outputs briefly aligning with those from amputee walking. Force sensing resistors were deployed at load bearing anatomic locations on the residuum/socket interface to measure pressures and were compared to those cited in the literature for similar locations. The development of such a novel simulator provides an objective adjunct, using commonly available mechanical test machines. It could potentially be used to provide further insight into socket design, fit and the complex load transfer mechanics at the residuum/socket interface, as well as to evaluate the structural performance of prostheses.

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Design of manikin for testing of residual-limb shape capture-method: Technical note

Cited by 3 publications

References 7 publications

3D-Printing and Upper-Limb Prosthetic Sockets: Promises and Pitfalls

3D-Printing and Upper-Limb Prosthetic Sockets: Promises and Pitfalls

3D-Printing and upper-limb prosthetic sockets; promises and pitfalls

Development of a residuum/socket interface simulator for lower limb prosthetics

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