A platform-based foot pressure/shear sensor

Chang, Chun Te; Liu, Chao Shih; Soetanto, William; Wang, Wei Chih

doi:10.1117/12.915396

Cited by 5 publications

(2 citation statements)

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“…The sensor prototype featured an improved resolution of 0.027 N, but the measurement range was limited to 0.28 N (corresponding to 280 kPa). This sensing mechanism has been used by other researchers aiming to measure the plantar pressure and shear stress of people with diabetes [102]- [104]. Their focus was to optimize sensor performance, particularly sensitivity and measurement range for this application but to date there is limited technical evidence of the outcome.…”

Section: E Fibre-optic Sensing Methodsmentioning

confidence: 99%

A Review of Wearable Sensor Systems to Monitor Plantar Loading in the Assessment of Diabetic Foot Ulcers

Wang

Jones

Chapman

et al. 2020

IEEE Trans. Biomed. Eng.

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Diabetes is highly prevalent throughout the world and imposes a high economic cost on countries at all income levels. Foot ulceration is one devastating consequence of diabetes, which can lead to amputation and mortality. Clinical assessment of diabetic foot ulcer (DFU) is currently subjective and limited, impeding effective diagnosis, treatment and prevention. Studies have shown that pressure and shear stress at the plantar surface of the foot plays an important role in the development of DFUs. Quantification of these could provide an improved means of assessment of the risk of developing DFUs. However, commerciallyavailable sensing technology can only measure plantar pressures, neglecting shear stresses and thus limiting their clinical utility. Research into new sensor systems which can measure both plantar pressure and shear stresses are thus critical. Our aim in this paper is to provide the reader with an overview of recent advances in plantar pressure and stress sensing and offer insights into future needs in this critical area of healthcare. Firstly, we use current clinical understanding as the basis to define requirements for wearable sensor systems capable of assessing DFU. Secondly, we review the fundamental sensing technologies employed in this field and investigate the capabilities of the resultant wearable systems, including both commercial and research-grade equipment. Finally, we discuss research trends, ongoing challenges and future opportunities for improved sensing technologies to monitor plantar loading in the diabetic foot.

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Section: E Fibre-optic Sensing Methodsmentioning

confidence: 99%

A Review of Wearable Sensor Systems to Monitor Plantar Loading in the Assessment of Diabetic Foot Ulcers

Wang

Jones

Chapman

et al. 2020

IEEE Trans. Biomed. Eng.

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“…The pressure measurement relies on the force induced light loss from the two affected crossing fibers, while the shear measurement depends on relative position changes in these pressure points between the two fiber mesh layers. This method was later used by other researchers [ 32 , 33 , 34 ], where they tried to improve the quality of the obtained data, but still with the disadvantage of a high number of fibers for each measuring point, hence its high complexity and large sensor size.…”

Section: Related Workmentioning

confidence: 99%

Gait Shear and Plantar Pressure Monitoring: A Non-Invasive OFS Based Solution for e-Health Architectures

Tavares

Domingues

Frizera

et al. 2018

Sensors

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In an era of unprecedented progress in sensing technology and communication, health services are now able to closely monitor patients and elderly citizens without jeopardizing their daily routines through health applications on their mobile devices in what is known as e-Health. Within this field, we propose an optical fiber sensor (OFS) based system for the simultaneous monitoring of shear and plantar pressure during gait movement. These parameters are considered to be two key factors in gait analysis that can help in the early diagnosis of multiple anomalies, such as diabetic foot ulcerations or in physical rehabilitation scenarios. The proposed solution is a biaxial OFS based on two in-line fiber Bragg gratings (FBGs), which were inscribed in the same optical fiber and placed individually in two adjacent cavities, forming a small sensing cell. Such design presents a more compact and resilient solution with higher accuracy when compared to the existing electronic systems. The implementation of the proposed elements into an insole is also described, showcasing the compactness of the sensing cells, which can easily be integrated into a non-invasive mobile e-Health solution for continuous remote gait monitoring of patients and elder citizens. The reported results show that the proposed system outperforms existing solutions, in the sense that it is able to dynamically discriminate shear and plantar pressure during gait.

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Platform-based Shear Force Sensor

Wang

Chang

Tsui

2015

MATEC Web of Conferences

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Abstract. In this paper, we will present the development of a flexible fiber optic bend loss sensor for the measurement of plantar pressure and shear stress for diabetic patients. The sensor will allow the measurement of shear stress on the foot, which is a critical parameter in studying diabetic foot ulcers. The basic configuration of the optical sensor systems incorporates a mesh that is comprised of two sets of parallel optical waveguide planes; the planes are configured so the parallel rows of waveguides of the top and bottom planes are perpendicular to each other. The planes are sandwiched together creating one sensing sheet. Two-dimensional information is determined by measuring the loss of light from each of the waveguide to map the overall pressure distribution. The shifting of the layers relative to each other produces different patterns of the sensor output, and shear force information is characterized through repeated training of the sensor and analysis of the training data. The latest development and improvement in the sensors design is presented. Fabrication and sensor characterization results will be presented.

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A platform-based foot pressure/shear sensor

Cited by 5 publications

References 0 publications

A Review of Wearable Sensor Systems to Monitor Plantar Loading in the Assessment of Diabetic Foot Ulcers

A Review of Wearable Sensor Systems to Monitor Plantar Loading in the Assessment of Diabetic Foot Ulcers

Gait Shear and Plantar Pressure Monitoring: A Non-Invasive OFS Based Solution for e-Health Architectures

Platform-based Shear Force Sensor

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