Pressure Measurement at Biomedical Interfaces

Casey, Vincent; Grace, Pierce A.; Clarke‐Moloney, Mary

doi:10.5772/21855

Cited by 12 publications

(17 citation statements)

References 31 publications

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“…This is the situation for the nasal bones and mandibular rami as indicated by the red regions of the profile. Regions where the curvature is negative, such as the inter nasal bone and inter mandibular rami areas, will experience zero normal force as the noseband spans linearly over them in a process often referred to as ‘hammocking’ [19]. An enlarged view of the relative variation in this normal force component, based on this simple curvature model, is shown in Fig 2 for the frontal nasal plane.…”

Section: Introductionmentioning

confidence: 99%

“…The living tissue-leather interface environment presents special challenges for these technologies which are developed specifically for fluids (gases and liquids) in the case of pressure sensors [19] and rigid elements in the case of force sensors. Tissue and leather do not fit into a simple physical phase classification category and so special housings and couplers, specific to the actual interface of interest, must be devised if the sensor technology is to be deployed directly at the measurement site.…”

Section: Introductionmentioning

confidence: 99%

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An Objective Measure of Noseband Tightness and Its Measurement Using a Novel Digital Tightness Gauge

et al. 2017

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Noseband tightness is difficult to assess in horses participating in equestrian sports such as dressage, show jumping and three-day-eventing. There is growing concern that nosebands are commonly tightened to such an extent as to restrict normal equine behaviour and possibly cause injury. In the absence of a clear agreed definition of noseband tightness, a simple model of the equine nose-noseband interface environment was developed in order to guide further studies in this area. The normal force component of the noseband tensile force was identified as the key contributor to sub-noseband tissue compression. The model was used to inform the design of a digital tightness gauge which could reliably measure the normal force component of the noseband tensile force. A digital tightness gauge was developed to measure this parameter under nosebands fitted to bridled horses. Results are presented for field tests using two prototype designs. Prototype version three was used in field trial 1 (n = 15, frontal nasal plane sub-noseband site). Results of this trial were used to develop an ergonomically designed prototype, version 4, which was tested in a second field trial (n = 12, frontal nasal plane and lateral sub-noseband site). Nosebands were set to three tightness settings in each trial as judged by a single rater using an International Society for Equitation Science (ISES) taper gauge. Normal forces in the range 7–95 N were recorded at the frontal nasal plane while a lower range 1–28 N was found at the lateral site for the taper gauge range used in the trials. The digital tightness gauge was found to be simple to use, reliable, and safe and its use did not agitate the animals in any discernable way. A simple six point tightness scale is suggested to aid regulation implementation and the control of noseband tightness using normal force measurement as the objective tightness discriminant.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Objective Measure of Noseband Tightness and Its Measurement Using a Novel Digital Tightness Gauge

et al. 2017

Self Cite

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“…Thus, pressure measurements with sensors on the human body are complex. Varying Poisson's ratio at different body tissues as well as torque and shear forces may lead to measurement errors [11]. Moreover, by and by the body tissue is adapted to the shaping of the garment.…”

Section: Garment Pressure Evaluationmentioning

confidence: 99%

Three-Dimensional Quantification of Foundation Garment s Shaping Effects

Klepser¹,

Hiss²,

Mahr-Erhardt³

et al. 2018

Proceedings of 3DBODY.TECH 2018 - 9th International Conference and Exhibition on 3D Body Scanning and Processing Technologies,

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Fashion garments sculpt the human body according to the up-to-date style. Foundation garments used to be out of whalebone and stiff materials. Nowadays thin and light shapewear aims to smooth obvious subcutaneous fat. Material, pattern, fit and formability of the body tissue influence the effect of shapewear. Thus, it is not known how much or even if shaping garments effect the body form. Moreover, there is a lack of standardized methods to analyze shaping effects of foundation garments. Up to now research focused two paths to analyze the functionality of shaping garment. First was to quantify the pressure applied, second was to measure the body changes achieved by the products. Governmental funded research project "Shaping Effects" aims to combine and pursue the research approaches. Project term is two years starting from April 2017. Therefore, most of the work is ongoing. The following presents preliminary results. 41 shapewear products were tested with HOSY apparatus to measure pressure gradient. PicoPress device was utilized to determine pressure between garment and manikin or human body respectively. 3D-analysis based on before and after scans was performed to measure changes in body geometry. Two test subjects tested shaping garments so far. Test methods were processed successfully. First results underlined the influence of material properties, body geometry and body tissue on shaping effects.

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“…A benefit of the custom load sensor used in the studies was the ability to control the overall geometry of the sensor. The commercial force sensing resistors used in earlier studies are typically very low profile, but being commercial products are limited to specific sizes and geometries, and are generally better suited to analysing hard contact [9,10]. Giesberts' custom sensor was designed to a specific geometry to fit between the orthosis and skin; being thick enough to ensure constant contact throughout the study.…”

Section: Introductionmentioning

confidence: 99%

Design and Evaluation of Magnetic Hall Effect Tactile Sensors for Use in Sensorized Splints

Jones

Wang

Ghanbari

et al. 2020

Sensors

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Splinting techniques are widely used in medicine to inhibit the movement of arthritic joints. Studies into the effectiveness of splinting as a method of pain reduction have generally yielded positive results, however, no significant difference has been found in clinical outcomes between splinting types. Tactile sensing has shown great promise for the integration into splinting devices and may offer further information into applied forces to find the most effective methods of splinting. Hall effect-based tactile sensors are of particular interest in this application owing to their low-cost, small size, and high robustness. One complexity of the sensors is the relationship between the elastomer geometry and the measurement range. This paper investigates the design parameters of Hall effect tactile sensors for use in hand splinting. Finite element simulations are used to locate the areas in which sensitivity is high in order to optimise the deflection range of the sensor. Further simulations then investigate the mechanical response and force ranges of the elastomer layer under loading which are validated with experimental data. A 4 mm radius, 3 mm-thick sensor is identified as meeting defined sensing requirements for range and sensitivity. A prototype sensor is produced which exhibits a pressure range of 45 kPa normal and 6 kPa shear. A proof of principle prototype demonstrates how this can be integrated to form an instrumented splint with multi-axis sensing capability and has the potential to inform clinical practice for improved splinting.

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Pressure Measurement at Biomedical Interfaces

Cited by 12 publications

References 31 publications

An Objective Measure of Noseband Tightness and Its Measurement Using a Novel Digital Tightness Gauge

An Objective Measure of Noseband Tightness and Its Measurement Using a Novel Digital Tightness Gauge

Three-Dimensional Quantification of Foundation Garment s Shaping Effects

Design and Evaluation of Magnetic Hall Effect Tactile Sensors for Use in Sensorized Splints

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