Pinch Force Required for Adults Over 50 Years of Age to Open Several Types of Food Containers

2021 ◽  
Author(s):  
Nancy Hock ◽  
Linda Shuster ◽  
Debra Lindstrom ◽  
Brenda Coppard
Keyword(s):  
Pinch Force

scholarly journals Design of a 3D-printed hand prosthesis featuring articulated bio-inspired fingers

2020 ◽  
pp. 095441192098088
Author(s):  
Juan Sebastian Cuellar ◽  
Dick Plettenburg ◽  
Amir A Zadpoor ◽  
Paul Breedveld ◽  
Gerwin Smit
Keyword(s):  
3D Printing ◽  
Design Principles ◽  
Prosthetic Hand ◽  
Hand Prosthesis ◽  
Fused Deposition ◽  
Pinch Force ◽  
Actuation System ◽  
3D Printed ◽  
Energy Dissipated ◽  
Dual Material

Various upper-limb prostheses have been designed for 3D printing but only a few of them are based on bio-inspired design principles and many anatomical details are not typically incorporated even though 3D printing offers advantages that facilitate the application of such design principles. We therefore aimed to apply a bio-inspired approach to the design and fabrication of articulated fingers for a new type of 3D printed hand prosthesis that is body-powered and complies with basic user requirements. We first studied the biological structure of human fingers and their movement control mechanisms in order to devise the transmission and actuation system. A number of working principles were established and various simplifications were made to fabricate the hand prosthesis using a fused deposition modelling (FDM) 3D printer with dual material extrusion. We then evaluated the mechanical performance of the prosthetic device by measuring its ability to exert pinch forces and the energy dissipated during each operational cycle. We fabricated our prototypes using three polymeric materials including PLA, TPU, and Nylon. The total weight of the prosthesis was 92 g with a total material cost of 12 US dollars. The energy dissipated during each cycle was 0.380 Nm with a pinch force of ≈16 N corresponding to an input force of 100 N. The hand is actuated by a conventional pulling cable used in BP prostheses. It is connected to a shoulder strap at one end and to the coupling of the whiffle tree mechanism at the other end. The whiffle tree mechanism distributes the force to the four tendons, which bend all fingers simultaneously when pulled. The design described in this manuscript demonstrates several bio-inspired design features and is capable of performing different grasping patterns due to the adaptive grasping provided by the articulated fingers. The pinch force obtained is superior to other fully 3D printed body-powered hand prostheses, but still below that of conventional body powered hand prostheses. We present a 3D printed bio-inspired prosthetic hand that is body-powered and includes all of the following characteristics: adaptive grasping, articulated fingers, and minimized post-printing assembly. Additionally, the low cost and low weight make this prosthetic hand a worthy option mainly in locations where state-of-the-art prosthetic workshops are absent.

Comparison of simulated key pinch after three surgical procedures for trapeziometacarpal osteoarthritis: a cadaver study

2021 ◽  
pp. 175319342110159
Author(s):  
Lionel Athlani ◽  
Damien Motte ◽  
Marie Martel ◽  
Florent Moissenet ◽  
Julie Mottet ◽  
...  
Keyword(s):  
Surgical Procedures ◽  
Total Joint Arthroplasty ◽  
Ligament Reconstruction ◽  
Cadaver Study ◽  
Joint Arthroplasty ◽  
Pinch Force ◽  
Trapeziometacarpal Osteoarthritis ◽  
Intact Sample ◽  
Significant Difference ◽  
Tendon Interposition

We performed a cadaver study using 18 fresh-frozen adult forearms and hands to compare the tendon loads required to generate progressively greater key pinch (0.5 kg to 2 kg) after three different surgical procedures to treat trapeziometacarpal osteoarthritis: isolated trapeziectomy, trapeziectomy followed by ligament reconstruction with tendon interposition and total joint arthroplasty using a Touch® implant. Thumb pinch was simulated by loading the main actuator tendons involved in the key pinch. Six specimens were randomly assigned to each of the three surgical procedure groups. Measurements were made before and after the joint surgery. Specimens that underwent trapeziectomy with or without ligament reconstruction with tendon interposition required significantly higher tendon loads than those with the implant to achieve the same pinch force. There was no significant difference between the isolated trapeziectomy and ligament reconstruction groups. Using the implant resulted in similar median tendon loads compared with those of the intact sample. Total joint arthroplasty with a Touch® prosthesis may yield a superior biomechanical profile in which the tendon loads needed to achieve a certain key pinch force are lower and better distributed between the actuator muscles compared with trapeziectomy with or without ligament reconstruction.

scholarly journals An assimilation of TRIZ in dissecting the statistical outcomes of tactile sensitivity, pinch force and endurance among elderly people

2021 ◽  
Vol 8 (1) ◽  
pp. 1891710
Author(s):  
Dominic Wen How Tan ◽  
Poh Kiat Ng ◽  
Ervina Efzan Mhd Noor
Keyword(s):  
Elderly People ◽  
Tactile Sensitivity ◽  
Pinch Force

scholarly journals Long-Term Microgravity Effects on Isometric Handgrip and Precision Pinch Force with Visual and Proprioceptive Feedback

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Ilario Puglia ◽  
Michele Balsamo ◽  
Marco Vukich ◽  
Valfredo Zolesi
Keyword(s):  
Maximum Voluntary Contraction ◽  
Space Station ◽  
Voluntary Contraction ◽  
Force Output ◽  
Isometric Handgrip ◽  
Short Term ◽  
Space Flights ◽  
Pinch Force ◽  
Long Duration

The study and analysis of human physiology during short- and long-duration space flights are the most valuable approach in order to evaluate the effect of microgravity on the human body and to develop possible countermeasures in prevision of future exploratory missions and Mars expeditions. Hand performances such as force output and manipulation capacity are fundamental for astronauts’ intra- and extravehicular activities. Previous studies on upper limb conducted on astronauts during short-term missions (10 days) indicated a temporary partial reduction in the handgrip maximum voluntary contraction (MVC) followed by a prompt recovery and adaptation to weightlessness during the last days of the mission. In the present study, we report on the “Crew’s Health: Investigation on Reduced Operability” (CHIRO) protocol, developed for handgrip and pinch force investigations, performed during the six months increment 7 and increment 8 (2003-2004) onboard International Space Station (ISS). We found that handgrip and pinch force performance are reduced during long-term increments in space and are not followed by adaptation during the mission, as conversely reported during short-term increment experiments. The application of protocols developed in space will be eligible to astronauts during long-term space missions and to patients affected by muscle atrophy diseases or nervous system injury on Earth.

Influences of Tactile Sensation on Pinch Force under Loaded and Unloaded Conditions

2015 ◽  
Vol 12 (8) ◽  
pp. 588-592
Author(s):  
Poh Kiat Ng ◽  
Kian Siong Jee ◽  
Adi Saptari ◽  
Chiew Yean Ng
Keyword(s):  
Tactile Sensation ◽  
Pinch Force

scholarly journals Mechanisms controlling motor output to a transfer hand after learning a sequential pinch force skill with the opposite hand

2009 ◽  
Vol 120 (10) ◽  
pp. 1859-1865 ◽  
Author(s):  
Mickael Camus ◽  
Patrick Ragert ◽  
Yves Vandermeeren ◽  
Leonardo G. Cohen
Keyword(s):  
Motor Output ◽  
Pinch Force ◽  
Opposite Hand

Short term microgravity effect on isometric hand grip and precision pinch force with visual and proprioceptive feedback

2004 ◽  
Vol 33 (8) ◽  
pp. 1368-1374 ◽  
Author(s):  
P. Pastacaldi ◽  
P. Orsini ◽  
F. Bracciaferri ◽  
G. Neri ◽  
M. Porciani ◽  
...  
Keyword(s):  
Proprioceptive Feedback ◽  
Short Term ◽  
Pinch Force ◽  
Hand Grip ◽  
Microgravity Effect

Application of magnetic pinch force to arc plasma processes

1976 ◽  
Vol 47 (11) ◽  
pp. 4863-4866 ◽  
Author(s):  
D. Bhattacharyya ◽  
W. H. Gauvin
Keyword(s):  
Arc Plasma ◽  
Pinch Force
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