An interfacial stress sensor for biomechanical applications

Sundara-Rajan, Kishore; Bestick, Aaron; Rowe, Gabriel I.; Klute, Glenn K.; Ledoux, William R.; Wang, H C; Mamishev, A.V.

doi:10.1088/0957-0233/23/8/085701

Cited by 23 publications

(10 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A planeshear strain gage rosette was first demonstrated in [20]. Current developments of shear stress sensors are based on MEMS technology [21], including piezo-resistive [22] or capacitive [23,24] shear stress sensors. More recently, Missine et al [25] demonstrated an optoelectronic shear sensor based on measuring the optical power with a photodiode received from a vertical cavity surface-emitting laser facing the photodiode and separated with a deformable transduction layer.…”

Section: Introductionmentioning

confidence: 99%

Shear stress sensing with Bragg grating-based sensors in microstructured optical fibers

Sulejmani¹,

Sonnenfeld²,

Geernaert³

et al. 2013

Opt. Express

View full text Add to dashboard Cite

Abstract:We demonstrate shear stress sensing with a Bragg grating-based microstructured optical fiber sensor embedded in a single lap adhesive joint. We achieved an unprecedented shear stress sensitivity of 59.8 pm/MPa when the joint is loaded in tension. This corresponds to a shear strain sensitivity of 0.01 pm/µε. We verified these results with 2D and 3D finite element modeling. A comparative FEM study with conventional highly birefringent side-hole and bow-tie fibers shows that our dedicated fiber design yields a fourfold sensitivity improvement.

show abstract

Section: Introductionmentioning

confidence: 99%

Shear stress sensing with Bragg grating-based sensors in microstructured optical fibers

Sulejmani¹,

Sonnenfeld²,

Geernaert³

et al. 2013

Opt. Express

View full text Add to dashboard Cite

show abstract

“…Attempts to produce sensors capable of measuring the pressure within prosthetic sockets have tended to involve piezoresistive [21][22][23], piezoelectric [24][25][26], capacitive [27][28][29][30], optical sensors [31][32][33][34][35][36][37] and microelectromechanical (MEMs) sensors [38][39][40][41].…”

mentioning

confidence: 99%

Examination of the Performance Characteristics of Velostat as an In-Socket Pressure Sensor

2020

View full text Add to dashboard Cite

Velostat is a low-cost, low-profile electrical bagging material with piezoresistive properties, making it an attractive option for in-socket pressure sensing. The focus of this research was to explore the suitability of a Velostatbased system for providing real-time socket pressure profiles. The prototype system performance was explored through a series of bench tests to determine properties including accuracy, repeatability and hysteresis responses, and through participant testing with a single subject. The fabricated sensors demonstrated mean accuracy errors of 110 kPa and significant cyclical and thermal drift effects of up to 0.00715 V/cycle and leading to up to a 67% difference in voltage range respectively. Despite these errors the system was able to capture data within a prosthetic socket, aligning to expected contact and loading patterns for the socket and amputation type. Distinct pressure maps were obtained for standing and walking tasks displaying loading patterns indicative of posture and gait phase. The system demonstrated utility for assessing contact and movement patterns within a prosthetic socket, potentially useful for improvement of socket fit, in a low cost, low profile and adaptable format. However, Velostat requires significant improvement in its electrical properties before proving suitable for accurate pressure measurement tools in lower limb prosthetics.

show abstract

“…81 139 They are the key representatives of prosthesis to body load transfer. 156 The magnitude of TT interfacial ranged from 0.4 to 76.2-79.6 kPa at the anterior medial region during stance. 134 140 Excessive shear over the stump leads to local separation of dermis from epidermis followed by fluid deposition and blister formation (Sanders et al, 1993b).…”

Section: Interfacial Shear Stressmentioning

confidence: 97%

“…rightdiagnosis.com/a/amputation/prevalence.htm, accessed on 26-09-2012). Prevalence of LL amputation in USA is 623000 156 whereas its annual incidence in UK is 5500. 22 42 According to National Limb Loss Information Centre USA, four major causes have been identified for amputation which are Vascular disease, Trauma, Cancer and Congenital anomalies 46 as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Review: Problems with Use of Trans-Tibial Prosthesis

Chatterjee¹,

Majumder²,

Roy-Chowdhury³

et al. 2016

j med imaging hlth inform

View full text Add to dashboard Cite

Discomfort and elevated energy consumption is still a common companion of many prosthetic users, generally due to altered loading condition which the body is not adapted to, preventing them to participate actively in the society. The socket, being an interface between body and prosthesis, is believed to be the most important concern regarding comfort of prosthetic use. The main cause of problem is altered gait dynamics. Local stress concentration, friction and slippage, confinement into warm moist environment inside socket, etc. adds to discomfort. The stump, being a living part, is also subjected to variations. These produce various soft tissue problems and enhance energy expenditure. This can be somewhat countered by even distribution of load along stump. In this review article, papers regarding biomechanics and pathomechanics of prosthetic gait, the mechanical and corresponding medical problems and suggested solutions have been studied in details. 59% of Trans-Tibial amputees and 78% of Trans-Femoral amputees are found to have problems with socket fit. This results in skin irritations in 41% of TT amputees and 22% of TF amputees. The main problems are regional stress concentration, friction and rubbing of stump along socket and energy expenditure. Hydrostatic total surface bearing and variable geometry fitting socket has been hypothesized to counter this problem though they are also having their own limitations.

show abstract

An interfacial stress sensor for biomechanical applications

Cited by 23 publications

References 41 publications

Shear stress sensing with Bragg grating-based sensors in microstructured optical fibers

Shear stress sensing with Bragg grating-based sensors in microstructured optical fibers

Examination of the Performance Characteristics of Velostat as an In-Socket Pressure Sensor

Review: Problems with Use of Trans-Tibial Prosthesis

Contact Info

Product

Resources

About