The static friction behaviour of skin with relevance to pressure ulcer prevalence

Abstract

dat de micro-omgeving een grote invloed heeft op de wrijvingscoëfficiënt. Zowel de temperatuur als de relatieve vochtigheid hebben een sterke invloed op het wrijvingsgedrag. Dit werk suggereert dat, vanuit tribologisch oogpunt, het verminderen van de luchtvochtigheid de primaire focus zou moeten zijn. Het effect van oppervlakteruwheid en hardheid werd onderzocht met siliconen tegenoppervlakken die gewoonlijk worden gebruikt voor prothese liners. Door gebruik te maken van oppervlakteruwheid en het variëren van de compliantie van het siliconen tegenoppervlak, kan de wrijvingscoëfficiënt worden gewijzigd.De verkregen resultaten zijn gecombineerd in twee ontwerpdiagrammen waarin de wrijvingscoëfficiënt wordt weergegeven als functie van verschillende parameters. Eén diagram is voor het optimaliseren van de micro-omgeving in de huid-object-interface, en één met betrekking tot oppervlakken in contact met de huid die gecontroleerde niveaus van wrijving vertonen met het doel om omstandigheden voor het voorkomen van drukverwonding te optimaliseren.

Effects of sebum properties on skin friction: investigation using a bench test

“…when the skin was not cleaned or prepared before performing measurements, the amount of lipids on the skin appears to not significantly affect the friction in skin–object interactions. This was more or less consistent with findings presented in [14, 16, 19, 20]. Pailler‐Mattei et al [20] showed skin in the ‘normal state’ to have elevated adhesion compared to skin from which the lipids have been removed, whilst Cua et al [11] and Gupta [18] described finding a moderately weak correlation between friction and the skin surface lipid content, but only at a selected number of anatomical locations.…”

“…Pailler‐Mattei et al [20] showed skin in the ‘normal state’ to have elevated adhesion compared to skin from which the lipids have been removed, whilst Cua et al [11] and Gupta [18] described finding a moderately weak correlation between friction and the skin surface lipid content, but only at a selected number of anatomical locations. A third finding by Klaassen [19] was that the mechanical characteristics and the composition of skin sebum are correlated with friction.…”

“…When conducted appropriately, in‐vivo experiments benefit from relevance to real‐life situations, but their repeatability is typically fairly low, with large variation in obtained friction coefficients depending on the individual characteristics and the anatomical region at which measurements are made [8]. The above‐mentioned relationships between skin moisture content and friction as well as skin surface lipid content and friction [19] have a correlation coefficient r of about 0.7–0.8 (i.e. r 2 ≃ 0.5 to – 0.65), which, although low, is considered typical for a significant correlation for tribology results obtained in vivo.…”

Integration of 3D Printed Flexible Pressure Sensors into Physical Interfaces for Wearable Robots

“…While the sensor developed in this study provides a potential solution for further investigations, it is limited in the fact that only normal pressure can be measured. This is important, since shear forces have been found to have a larger influence on e.g., pressure ulcers than normal forces [ 29 ]. Especially since it it was shown that a major part of people who experienced a spinal cord injury cope with pressure injuries during their lifetime with dramatic changes in their skin structures that are likely to break down with a minimal amount of shear [ 30 ].…”

A review of the bio-tribology of medical devices

“…It is generally observed over a bony prominence in patients with reduced mobility as well as amputees wearing a prosthesis. In particular, about 75% of those amputees wearing lower-limb prostheses encounter pressure ulcers [74]. Although pressure ulcer is commonly observed, the exact cause and mechanism are still unclear since little work has investigated the skindevice interface [75].…”