An air-cell-based cushion for pressure ulcer protection remarkably reduces tissue stresses in the seated buttocks with respect to foams: Finite element studies

Levy, Ayelet; Kopplin, Kara; Gefen, Amit

doi:10.1016/j.jtv.2013.12.005

Cited by 74 publications

(65 citation statements)

References 23 publications

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“…Therefore, the FE modelling of the pelvic binder and tissue interactions would take into account these factors to properly simulate the phenomena of tissue interactions. One important factor in reducing the high pressure on tissue interfaces is friction coefficient, where the difference in friction coefficient gives a significant effect on the pressure obtained [13,[16][17][18]. This condition is parallel with studies by previous researchers who stated that risk of pressure sores on patients could be reduced by considering the condition of friction and shear stress on tissue interfaces [19].…”

Section: Introductionsupporting

confidence: 64%

“…Thus, the finite element (FE) modelling should be conducted to find the behaviour and the effect of tissue mechanical response against PCCDs. FE simulation of tissue interactions was carried out by researchers to study the effect of contact pressure on tissue interfaces [9][10][11][12][13][14][15][16]. Based on these studies it showed that there were many factors influencing pressure on tissue interactions, such as geometry, material model, boundary conditions and applied load.…”

Section: Introductionmentioning

confidence: 99%

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Pressure sores of human tissue damage during pelvic binder compression

Munandar

Huzni

Ismail

et al. 2016

Int. J. Automot. Mech. Eng.

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Pelvic circumferential compression is a device used to reduce injury which inadvertently, cause soft tissue damage. When force is applied excessively to the pelvic binder, tissue is damaged due to prolonged high pressure. Therefore, effect from this interaction between tissue and pelvic binder is an important factor to avoid pressure sores due to human tissue damage. The aim of this study is to investigate the effects of human tissue interaction due to compression of the pelvic binder using a finite element modelling approach. A three-dimensional human pelvic model was developed to simulate pressure distribution on tissue interfaces. The applied loads with two different conditions -dry and wet skin were applied on both tips of the pelvic strap during binder-tissue interaction. The compression load of the pelvic binder was estimated on a pelvic strap in order to reduce pelvic fracture. The compression load was varied substantially between locations as well as between skin conditions. There were two straps on the pelvis. For pelvic strap 1, the pressure on the sacrum and ilium was higher than the pressure measured on pelvic strap 2 while pressure on the anterior area was the same for both pelvic straps. Analysis results showed that the pressure which developed between both tissue and pelvic binder exceeded the recommended pressure i.e. ≥ 9.3 kPa at tissue interfaces. When pressure on tissue interfaces is not controlled, this condition can lead to tissue damage due to prolonged periods of time. Hence, to avoid tissue damage to the pelvic binder a cushion must be introduced to reduce the effect of tissue reaction from the prehospital device. Subsequently, tissue and pelvic binder interaction simulation results were compared with experimental data for validation in the model developed.

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Section: Introductionsupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Pressure sores of human tissue damage during pelvic binder compression

Munandar

Huzni

Ismail

et al. 2016

Int. J. Automot. Mech. Eng.

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“…Though the majority of previous studies [21,22] have paid more attention to the study of pressure distribution between the body-seat interface, Gefen [23] proposed a mathematical model that includes the connection between the skin temperature and pressure ulcers while suggesting possible interventions to reduce potential risks by optimizing microclimate factors (e.g. temperature and relative humidity).…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Microenvironment temperature prediction between body and seat interface using autoregressive data-driven model

Liu

Lin

Luo

et al. 2015

Journal of Tissue Viability

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT AbstractThere is a need to develop a greater understanding of temperature at the skin-seat interface during prolonged seating from the perspectives of both industrial design (comfort/discomfort) and medical care (skin ulcer formation). Here we test the concept of predicting temperature at the seat surface and skin interface during prolonged sitting (such as required from wheelchair users). As caregivers are usually busy, such a method would give them warning ahead of a problem. This paper describes a data-driven model capable of predicting thermal changes and thus having the potential to provide an early warning (15-to 25-minute ahead prediction) of an impending temperature that may increase the risk for potential skin damages for those subject to enforced sitting and who have little or no sensory feedback from this area.Initially, the oscillations of the original signal are suppressed using the reconstruction strategy of empirical mode decomposition (EMD). Consequentially, the autoregressive data-driven model can be used to predict future thermal trends based on a shorter period of acquisition, which reduces the possibility of introducing human errors and artefacts associated with longer duration "enforced" sitting by volunteers. In this study, the method had a maximum predictive error of <0.4 o C when used to predict the temperature at the seat and skin interface 15 minutes ahead, but required 45 minutes data prior to give this accuracy. Although the 45 minutes front loading of data appears large (in proportion to the 15 minute prediction), a relative strength derives from the fact that the same algorithm could be used on the other 4 sitting datasets created by the same individual, suggesting that the period of 45 minutes required to train the algorithm is transferable to other data from the same individual. This approach might be developed (along with incorporation of other measures such as movement and humidity) into a system that can give caregivers prior warning to help avoid exacerbating the skin disorders of patients who suffer from low body insensitivity and disability requiring them to be immobile in seats for prolonged periods.

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“…In addition, they are vital tools for FEA based design and development of technologies and support systems that can reduce the incidence of pressure ulcers (e.g. [7][9]).…”

Section: Introductionmentioning

confidence: 99%

“…In terms of FEA geometries, 2D models are common (e.g. [7]), and 3D models have also been explored (e.g. [9]).…”

Section: Introductionmentioning

confidence: 99%

On the Importance of 3D, Geometrically Accurate, and Subject-Specific Finite Element Analysis for Evaluation of in-Vivo Soft Tissue Loads

Moerman¹,

Vijven²,

Solis³

et al. 2016

Preprint

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Pressure ulcers are a type of local soft tissue injury due to sustained mechanical loading and remain a common issue in patient care. People with spinal cord injury (SCI) are especially at risk of pressure ulcers due to impaired mobility and sensory perception. The development of load improving support structures relies on realistic tissue load evaluation e.g. using finite element analysis (FEA). FEA requires realistic subject-specific mechanical properties and geometries. This study focuses on the effect of geometry. MRI is used for the creation of geometrically accurate models of the human buttock for three able-bodied volunteers and three volunteers with SCI. The effect of geometry on observed internal tissue deformations for each subject is studied by comparing FEA findings for equivalent loading conditions. The large variations found between subjects confirms the importance of subject-specific FEA.

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An air-cell-based cushion for pressure ulcer protection remarkably reduces tissue stresses in the seated buttocks with respect to foams: Finite element studies

Cited by 74 publications

References 23 publications

Pressure sores of human tissue damage during pelvic binder compression

Pressure sores of human tissue damage during pelvic binder compression

Microenvironment temperature prediction between body and seat interface using autoregressive data-driven model

On the Importance of 3D, Geometrically Accurate, and Subject-Specific Finite Element Analysis for Evaluation of in-Vivo Soft Tissue Loads

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