Conducting and interpreting interface pressure evaluations of clinical support surfaces

Shelton, Frederick; Lott, Judy Wright

doi:10.1016/s0197-4572(03)00212-x

Cited by 17 publications

(10 citation statements)

References 6 publications

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“…Some studies suggest that threshold value should be 32 mmHg due to its correspondence with the capillary pressure at heart level. Above this pressure the capillaries could be obstructed and it could result in a deprivation of oxygen in the tissues [10,21,23]. On the other hand, Bar (1998) determined that this value was too low to be considered as threshold pressure and suggested that a more accurate value for the buttocks would be 60 mmHg [22].…”

Section: Discomfort In Sitting Posturementioning

confidence: 99%

An approach to aircraft seat comfort using interface pressure mapping

Ciaccia

Sznelwar

2012

Work

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The objective of the present study is to propose a method to dynamically evaluate discomfort of a passenger seat by measuring the interface pressure between the occupant and the seat during the performance of the most common activities of a typical flight 1 . This article reports the results of resting and reading studies performed in a simulator that represents the interior of a commercial aircraft.

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Section: Discomfort In Sitting Posturementioning

confidence: 99%

An approach to aircraft seat comfort using interface pressure mapping

Ciaccia

Sznelwar

2012

Work

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“…mattresses and cushions. 34 However, knowledge of internal stresses in loaded soft tissues proposes a solution to the recently reported hazardous clinical condition of a deep tissue injury (DTI) misdiagnosed as a superficial pressure ulcer. 1,2,5,6,14 The recent 2005 Consensus Conference of the US National Pressure Ulcer Advisory Panel (NPUAP) stressed the lack of clinical tools to properly diagnose DTI cases 5 , and our study was motivated by this problem.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Patient-Specific Finite Element Analysis of Internal Stresses in the Soft Tissues of a Residual Limb: A New Tool for Prosthetic Fitting

et al. 2006

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Fitting of a prosthetic socket is a critical stage in the process of rehabilitation of a trans-tibial amputation (TTA) patient, since a misfit may cause pressure ulcers or a deep tissue injury (DTI: necrosis of the muscle flap under intact skin) in the residual limb. To date, prosthetic fitting typically depends on the subjective skills of the prosthetist, and is not supported by biomedical instrumentation that allows evaluation of the quality of fitting. Specifically, no technology is presently available to provide real-time continuous information on the internal distribution of mechanical stresses in the residual limb during fitting of the prosthesis, or while using it and this severely limits patient evaluations. In this study, a simplified yet clinically oriented patient-specific finite element (FE) model of the residual limb was developed for real-time stress analysis. For this purpose we employed a custom-made FE code that continuously calculates internal stresses in the residual limb, based on boundary conditions acquired in real-time from force sensors, located at the limb-prosthesis interface. Validation of the modeling system was accomplished by means of a synthetic phantom of the residual limb, which allowed simultaneous measurements of interface pressures and internal stresses. Human studies were conducted subsequently in five TTA patients. The dimensions of bones and soft tissues were obtained from X-rays of the residual limb of each patient. An indentation test was performed in order to obtain the effective elastic modulus of the soft tissues of the residual limb. Seven force sensors were placed between the residual limb and the prosthetic liner, and subjects walked on a treadmill during analysis. Generally, stresses under the shinbones were approximately threefold higher than stresses at the soft tissues behind the bones. Usage of a thigh corset decreased the stresses in the residual limb during gait by approximately 80%. Also, the stresses calculated during the trial of a subject who complained about pain and discomfort were the highest, confirming that his socket was not adequately fitted. We conclude that real-time patient-specific FE analysis of internal stresses in deep soft tissues of the residual limb in TTA patients is feasible. This method is promising for improving the fitting of prostheses in the clinical setting and for protecting the residual limb from pressure ulcers and DTI.

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“…For pressure mapping to be a useful clinical tool, the limitations of each system must be understood [3][4]. Several studies have reported on accuracy, creep, and hysteresis [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Effect of model design, cushion construction, and interface pressure mats on interface pressure and immersion

Pipkin

Sprigle²

2008

JRRD

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Abstract-Measuring interface pressure (IP) is one way to characterize cushion performance in the clinic and laboratory. This study explored how the presence of four commercially available IP mats affected IP on and immersion of two buttocks models. We loaded seven cushions with each buttocks model and captured pressure data using FSA sensors (Vista Medical Ltd; Winnipeg, Manitoba, Canada). Analysis was performed to compare pressure magnitude and immersion. Overall, both pressure magnitude and immersion changed after mat introduction. A significant interaction existed between cushion and mat condition and cushion and model for all variables. Introducing an IP mat to the model-cushion interface alters the loading on the cushion. The mats bridged the contours of the model, causing a change in IP at the locations studied. Although immersion was statistically different between mat conditions, the magnitude of the difference was less than 1 mm once we accounted for the thickness of the mats. The significance of the cushion-mat interaction indicates that the mat effect differed across cushion design. Clinical and research users of pressure mats should consider the effect of mat presence, the effect of model design, and mat and buttocks interactions with cushions for successful use.

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Conducting and interpreting interface pressure evaluations of clinical support surfaces

Cited by 17 publications

References 6 publications

An approach to aircraft seat comfort using interface pressure mapping

An approach to aircraft seat comfort using interface pressure mapping

Real-Time Patient-Specific Finite Element Analysis of Internal Stresses in the Soft Tissues of a Residual Limb: A New Tool for Prosthetic Fitting

Effect of model design, cushion construction, and interface pressure mats on interface pressure and immersion

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