Design and evaluation of two different finger concepts for body-powered prosthetic hand

Smit, Gerwin; Plettenburg, Dick H.; Helm, F.C.T. van der

doi:10.1682/jrrd.2012.12.0223

Cited by 6 publications

(8 citation statements)

References 17 publications

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“…Schmidt et al (2017) presented a higher efficiency of 86 % for their tendon actuator, although not reporting the influence of the bending angle. The presented RAS reaches a transmission efficiency comparable to hydraulic transmissions with cylinders at the output, which are generally expected to be higher than in cable-based systems (Smit et al, 2014a) (e.g., 80 % for electro-hydraulic transmission in Bechet and Ohnishi, 2014). However, the proposed cable-based RAS does not suffer from ergonomic and maintenance-related issues present in hydraulic transmissions due to, e.g., small leakage, noise emission, or more complex control.…”

Section: Discussionmentioning

confidence: 86%

Remote Actuation Systems for Fully Wearable Assistive Devices: Requirements, Selection, and Optimization for Out-of-the-Lab Application of a Hand Exoskeleton

et al. 2021

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Wearable robots assist individuals with sensorimotor impairment in daily life, or support industrial workers in physically demanding tasks. In such scenarios, low mass and compact design are crucial factors for device acceptance. Remote actuation systems (RAS) have emerged as a popular approach in wearable robots to reduce perceived weight and increase usability. Different RAS have been presented in the literature to accommodate for a wide range of applications and related design requirements. The push toward use of wearable robotics in out-of-the-lab applications in clinics, home environments, or industry created a shift in requirements for RAS. In this context, high durability, ergonomics, and simple maintenance gain in importance. However, these are only rarely considered and evaluated in research publications, despite being drivers for device abandonment by end-users. In this paper, we summarize existing approaches of RAS for wearable assistive technology in a literature review and compare advantages and disadvantages, focusing on specific evaluation criteria for out-of-the-lab applications to provide guidelines for the selection of RAS. Based on the gained insights, we present the development, optimization, and evaluation of a cable-based RAS for out-of-the-lab applications in a wearable assistive soft hand exoskeleton. The presented RAS features full wearability, high durability, high efficiency, and appealing design while fulfilling ergonomic criteria such as low mass and high wearing comfort. This work aims to support the transfer of RAS for wearable robotics from controlled lab environments to out-of-the-lab applications.

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Section: Discussionmentioning

confidence: 86%

Remote Actuation Systems for Fully Wearable Assistive Devices: Requirements, Selection, and Optimization for Out-of-the-Lab Application of a Hand Exoskeleton

et al. 2021

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“…Fluidic transmissions are generally more efficient for larger channel diameters, which could explain the low use in dynamic hand orthoses (3 out of 165). Despite this, hydraulic transmissions remain promising at similar scales [ 100 ] and are able to provide a more efficient alternative compared to a similar cable mechanism [ 101 ]. In comparison with hydraulics, a pneumatic transmission can offer faster responses due to the use of low-viscosity fluids [ 69 , 100 ], but is not encountered in the included dynamic hand orthoses.…”

Section: Discussionmentioning

confidence: 99%

A structured overview of trends and technologies used in dynamic hand orthoses

Bos

Haarman

Stortelder

et al. 2016

J NeuroEngineering Rehabil

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128

102

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The development of dynamic hand orthoses is a fast-growing field of research and has resulted in many different devices. A large and diverse solution space is formed by the various mechatronic components which are used in these devices. They are the result of making complex design choices within the constraints imposed by the application, the environment and the patient’s individual needs. Several review studies exist that cover the details of specific disciplines which play a part in the developmental cycle. However, a general collection of all endeavors around the world and a structured overview of the solution space which integrates these disciplines is missing. In this study, a total of 165 individual dynamic hand orthoses were collected and their mechatronic components were categorized into a framework with a signal, energy and mechanical domain. Its hierarchical structure allows it to reach out towards the different disciplines while connecting them with common properties. Additionally, available arguments behind design choices were collected and related to the trends in the solution space. As a result, a comprehensive overview of the used mechatronic components in dynamic hand orthoses is presented.Electronic supplementary materialThe online version of this article (doi:10.1186/s12984-016-0168-z) contains supplementary material, which is available to authorized users.

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“…[131,132] The 1970s, however, saw its use dwindle in place of newer room-temperature vulcanizing (RTV) silicones with improved tear strength. [38] Compared to PVC, RTV silicone prostheses are easier to fabricate with superior skin-like properties and color integrity. [38] A variant, PVC plastisol resin, can be placed into high-temperature molds which are heated to 200 °C to initiate polymerization.…”

Section: Plasticized Poly(vinyl Chloride)mentioning

confidence: 99%

“…[38] Compared to PVC, RTV silicone prostheses are easier to fabricate with superior skin-like properties and color integrity. [38] A variant, PVC plastisol resin, can be placed into high-temperature molds which are heated to 200 °C to initiate polymerization. [133,134] Plasticizers enabling skin-like properties can leach, however, with important biocompatibility implications, such as carcinogenicity, reduction of birth weight for exposed fetuses, shortening of the male anogenital distance, reduction of levels of serum testosterone and spermatocyte numbers, and disruption of the reticulo-endocrine systems.…”

Section: Plasticized Poly(vinyl Chloride)mentioning

confidence: 99%

“…[ 37 ] Further innovations in the 20th century produced many new polymers, such as vinyls, copolymers, plastisols, and one of the most significant materials in prosthetics, silicone. [ 38 ] Discovered in the early 1900s by Fredrick Kipping, silicone was first used in prosthetics by George W Barnhart in 1960. [ 39 ] This versatile polymer remains a primary prosthetic material today due to its soft tissue‐like properties, ease of manipulation, chemical inertness, durability, and excellent biocompatibility.…”

Section: Introductionmentioning

confidence: 99%

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Past, Present, and Future of Soft‐Tissue Prosthetics: Advanced Polymers and Advanced Manufacturing

et al. 2020

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past 30 years, [12,13] it is only the last decade that has seen its rapid development as part of the fourth industrial revolution. [14] This change in practice is evidenced by the significant fraction of recent literature describing advances in 3D printed prostheses, including technological advances [4,15-18] and clinical reports. [19,20] Further innovations involving collaborations between clinicians, academics, and industry, promise even greater capabilities. The future will see 3D printers that can mix materials as desired during fabrication [21] and those that can 3D print organic semiconductors and piezoelectric polymers for sensing and bionics [22-24] (Figure 1). This report is focused on polymers for soft tissue, external, personalized, prosthetics with clinical applications for the ear, [25] nose, [26] eye, [27] face, [28] breast, [29] and hand. [30] The characteristics of both traditional and 3D printable polymeric materials, as well as current advanced manufacturing technologies and those in development, are also reviewed. The earliest evidence of prosthetics dates back to ≈2300 BC, where Egyptian mummies have been discovered with eye, nose, and genital reconstructions fashioned from plaster packed with mud, sand, linen, butter, or soda (Figure 1). [31] Wood, cloth, natural waxes, resins, and metals were later used as the material of choice for rudimentary prostheses. [32] Prostheses remained relatively unchanged for thousands of years until the 16th century, where prosthetic noses and eyes were made from parchment, wax, wood, hard rubber, gold, silver, and copper. [33] Metals continued as a fundamental material throughout the 19th century, largely due to their ability to be shaped and molded as needed. [34,35] One of the first polymers to be used in prosthetics, poly(methyl methacrylate) (PMMA), was developed in response to the glass shortages in the World Wars of the 20th Century. [36] This polymer went on to become the most common prosthetic material of the time, and still finds use today in artificial eyes [33] and prosthetic substructures. [37] Further innovations in the 20th century produced many new polymers, such as vinyls, copolymers, plastisols, and one of the most significant materials in prosthetics, silicone. [38] Discovered in the early 1900s by Fredrick Kipping, silicone was first used in prosthetics by George W Barnhart in 1960. [39] This versatile polymer remains a primary prosthetic material today due to its soft tissue-like properties, ease of manipulation, chemical inertness, durability, and excellent biocompatibility. [40,41] The search for alternative materials Millions of people worldwide experience disfigurement due to cancers, congenital defects, or trauma, leading to significant psychological, social, and economic disadvantage. Prosthetics aim to reduce their suffering by restoring aesthetics and function using synthetic materials that mimic the characteristics of native tissue. In the 1900s, natural materials used for thousands of years in prosthetics were replaced by syntheti...

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Design and evaluation of two different finger concepts for body-powered prosthetic hand

Cited by 6 publications

References 17 publications

Remote Actuation Systems for Fully Wearable Assistive Devices: Requirements, Selection, and Optimization for Out-of-the-Lab Application of a Hand Exoskeleton

Remote Actuation Systems for Fully Wearable Assistive Devices: Requirements, Selection, and Optimization for Out-of-the-Lab Application of a Hand Exoskeleton

A structured overview of trends and technologies used in dynamic hand orthoses

Past, Present, and Future of Soft‐Tissue Prosthetics: Advanced Polymers and Advanced Manufacturing

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