Characteristics of a volume-adjustable compression chamber for transradial prosthetic interface

Sang, Yuanjun; Li, Xiang; Luo, Yun

doi:10.1177/0954411916645132

Cited by 15 publications

(11 citation statements)

References 26 publications

(37 reference statements)

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“…This dynamic adjustment mechanism can give the wearer a great comfort even when wearing the prosthesis for a long term. For example, for supporting transradial prosthesis, a frame-type socket 12,13 was proposed, which has four volume-adjustable compression chambers contacting with the residual limb. It can work under two discrete modes: the relax mode and the tight mode.…”

Section: Introductionmentioning

confidence: 99%

An adaptive socket with auto-adjusting air bladders for interfacing transhumeral prosthesis: A pilot study

Yang

Osborn

et al. 2019

Proc Inst Mech Eng H

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Comfort is a critical aspect in the application of wearable device, such as rehabilitation robots and upper limb prostheses. As a physical interface between human body and prosthetic limb, the socket and its comfort largely contribute to the user’s acceptance. Traditional sockets are static, lacking dynamic adjustment mechanism for the contact pressure. To ensure a reliable suspension during daily activities, the socket is usually designed to be tightly attached, with a large stress, on the residual limb, which may introduce considerable discomfort during long-term use. In this article, we present a novel adaptive transhumeral socket, in which we employ four independent bladders contacting with the stump. Not only can these bladders provide a necessary suspension for the device but also form an air cushion (soft body) that helps relieve the pressure concentration between the biological body and physical prosthesis. In real time, this adaptive socket continuously monitors the limb posture, the operating load, and the contacting pressure between the socket and the limb, and then dynamically adjusts the clamping force to ensure a reliable attachment during various daily activities. Since well adapting to the contours of the stump, the bladders can effectively accommodate the volume change of the stump, making a balanced load distribution on load-tolerant areas. Through modeling and numerical analysis, we established a dynamic strategy for estimating the external load and an automatic scheme for adjusting the bladders’ air pressure. Finally, a close-loop control was constructed based on the contact pressure measured by our self-developed force sensors. Our preliminary experiments on one normal (i.e. non-amputee) subject verified the effectiveness of the proposed method, showing that the adaptive socket can considerably reduce the socket–limb contact pressure while sustaining a secure suspension on the upper arm.

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Section: Introductionmentioning

confidence: 99%

An adaptive socket with auto-adjusting air bladders for interfacing transhumeral prosthesis: A pilot study

Yang

Osborn

et al. 2019

Proc Inst Mech Eng H

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“…The critical factor is the comfort and functionality [4]. The comfort-related problems are such as weight, fit, and heat [5].…”

Section: Introductionmentioning

confidence: 99%

Test Rig Design and Preliminarily Assessment for a Transradial Socket

Mm¹,

Ma²,

Ma³

2020

Int J Robot Eng

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Introduction: The transradial level is the most common level of upper-limb amputation seen by the prosthetist. The socket is an intermediate part to wear and fit the prosthetic device with the residual limb firmly. It is the crucial part of the prosthesis influencing the amputee's acceptance considerably. The study introduces a test rig that can assess the socket while simulating arm movements. Methods: The selected socket and test rig designs were drawn by SolidWorks CAD software. Test rig has abilities to tilt at any plane to simulate the arm movement and made of wood. The common movements during activities of daily living are (Abduction, Adduction, Flexion, Extension, Supination and Pronation) in Euler angles (Yaw, Pitch and Roll). A live-lift and axial load tests were done by the test rig in Euler angles simulating common arm movements. Results: The live-lift force is larger than the axial-load force at all cases. Conclusion: This experimental work covers two main tests for assessment the transradial socket at different positions and planes. It can predict when dislocation between the socket and residual limb will happen at any weight and plane.

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“…Several papers discussed creating a metric or pressure measurement when the socket had a good fit, often based on a prosthetist’s assessment, and then attempting to maintain this through adjustment [ 28 , 66 , 72 ]. An alternative method involved obtaining an approximation for the pressure limit of the residuum tissue, through indention testing [ 73 ] or numerical modelling [ 74 ], then restricting adjustments to that limit. It is also worth mentioning that using interface pressure alone has been shown to be a poor predictor of tissue damage, as similar interface pressure magnitudes often translate to considerably different internal tissue loads.…”

Section: Discussionmentioning

confidence: 99%

Adjustable prosthetic sockets: a systematic review of industrial and research design characteristics and their justifications

Baldock,

Pickard,

Prince

et al. 2023

J NeuroEngineering Rehabil

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Background The prosthetic socket is a key component that influences prosthesis satisfaction, with a poorly fitting prosthetic socket linked to prosthesis abandonment and reduced community participation. This paper reviews adjustable socket designs, as they have the potential to improve prosthetic fit and comfort through accommodating residual limb volume fluctuations and alleviating undue socket pressure. Methods Systematic literature and patent searches were conducted across multiple databases to identify articles and patents that discussed adjustable prosthetic sockets. The patents were used to find companies, organisations, and institutions who currently sell adjustable sockets or who are developing devices. Results 50 literature articles and 63 patents were identified for inclusion, representing 35 different designs used in literature and 16 commercially available products. Adjustable sockets are becoming more prevalent with 73% of publications (literature, patents, and news) occurring within the last ten years. Two key design characteristics were identified: principle of adjustability (inflatable bladders, moveable panels, circumferential adjustment, variable length), and surface form (conformable, rigid multi-DOF, and rigid single DOF). Inflatable bladders contributed to 40% of literature used designs with only one identified commercially available design (n = 16) using this approach. Whereas circumferential adjustment designs covered 75% of identified industry designs compared to only 36% of literature devices. Clinical studies were generally small in size and only 17.6% of them assessed a commercially available socket. Discussion There are clear differences in the design focus taken by industry and researchers, with justification for choice of design and range of adjustment often being unclear. Whilst comfort is often reported as improved with an adjustable socket, the rationale behind this is not often discussed, and small study sizes reduce the outcome viability. Many adjustable sockets lack appropriate safety features to limit over or under tightening, which may present a risk of tissue damage or provide inadequate coupling, affecting function and satisfaction. Furthermore, the relationship between design and comfort or function are rarely investigated and remain a significant gap in the literature. Finally, this review highlights the need for improved collaboration between academia and industry, with a strong disconnect observed between commercial devices and published research studies.

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Characteristics of a volume-adjustable compression chamber for transradial prosthetic interface

Cited by 15 publications

References 26 publications

An adaptive socket with auto-adjusting air bladders for interfacing transhumeral prosthesis: A pilot study

An adaptive socket with auto-adjusting air bladders for interfacing transhumeral prosthesis: A pilot study

Test Rig Design and Preliminarily Assessment for a Transradial Socket

Adjustable prosthetic sockets: a systematic review of industrial and research design characteristics and their justifications

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