Multi-axis flexible force sensor for tactile display

Kim, Baek-chul; Shin, Seung Han; Lee, Y.; Nam, Jae‐Do; Choi, Hyouk Ryeol; Moon, Hyungpil; Koo, Jachoon

doi:10.1109/icsens.2011.6127390

Cited by 2 publications

(2 citation statements)

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“…Previous literature has not referred to the viscous response of their sensor in detail [18][19][20][21][22][23][24][25]33], although Laszczak et al [33] possibly hinted at this based on the statement "a specific tare load was applied to the sensor for 30 s… this strategy minimized a possible transient response resulting from the viscoelastic behaviour of the Elastomer". Unfortunately, details about the tare load were not described, nor were details about the effectiveness of pre-loading in their experiment, making direct comparison to their results difficult.…”

Section: Viscous Sensor Response and Pre-loadingmentioning

confidence: 99%

“…Additionally, insertion of components with an elastic modulus that is dissimilar to UHMWPE may cause stress risers and promote damage of the bearing [16] , whereas capacitive sensors can be designed to be more compliant, because sensor materials and electrode construction can be adjusted to closely match the mechanical properties of the host component. Polymer based capacitive sensors have previously been used to measure forces [18][19][20][21][22][23][24][25] but never to measure forces within joints and they have never been incorporated into industrial production process used in producing polyethylene bearings.…”

Section: Introductionmentioning

confidence: 99%

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A novel flexible capacitive load sensor for use in a mobile unicompartmental knee replacement bearing: An in vitro proof of concept study

Mentink

Duren

Murray

et al. 2017

Medical Engineering & Physics

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Instrumented knee replacements can provide in vivo data quantifying physiological loads acting on the knee. To date instrumented mobile unicompartmental knee replacements (UKR) have not been realised. Ideally instrumentation would be embedded within the polyethylene bearing. This study investigated the feasibility of an embedded flexible capacitive load sensor. A novel flexible capacitive load sensor was developed which could be incorporated into standard manufacturing of compression moulded polyethylene bearings. Dynamic experiments were performed to determine the characteristics of the sensor on a uniaxial servo-hydraulic material testing machine. The instrumented bearing was measured at sinusoidal frequencies between 0.1 and 10Hz, allowing for measurement of typical gait load magnitudes and frequencies. These correspond to frequencies of interest in physiological loading. The loads that were applied were a static load of 390N, corresponding to an equivalent body weight load for UKR, and a dynamic load of ±293N. The frequency transfer response of the sensor suggests a low pass filter response with a -3dB frequency of 10Hz. The proposed embedded capacitive load sensor was shown to be applicable for measuring in vivo loads within a polyethylene mobile UKR bearing.

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