Design and Manufacturing of Portable Pressure Sensor for Measuring the Interface Pressure between the Body and (Orthosis or Socket Prosthesis)

2020 ◽  
Vol 45 ◽  
pp. 12-21
Author(s):  
Fahad Mohanad Kadhim ◽  
Salim Fattah Awad ◽  
Muhammad Safa Al-Din Tahir
Keyword(s):  
Measurement System ◽  
Pressure Measurement ◽  
Low Cost ◽  
Force Sensor ◽  
The Body ◽  
Sensor System ◽  
Interface Pressure ◽  
Lateral Instability ◽  
The Right ◽  
Pressure Measurement System

In this study, a sensor system was designed and manufactured to measure the interface pressure between the limbs and the orthosis or between the stump and the socket prosthesis. It is also used to determine the value and location of corrective forces when using orthosis to correct deformities in the limbs or spine. The sensor system consists of a force sensor mat (43.69 x 43.69 mm), Arduino, LCD monitor, and connecting cables. When comparing the device manufactured in this study with other devices, this device is characterized as lightweight, easy to move, low cost and gives instant pressure on the LCD screen. In this study, the interventional pressure measurement system was manufactured and programmed and compared to the F-Socket measurement system. The practical part was tested on a patient suffering from med-lateral instability in the ankle joint at the right leg. The interventional pressure between the leg and orthosis was measured in two ways at the regions (posterior, lateral, medial) .the first method using the pressure measurement system manufactured in this study and the second method by using the F-Socket device. The test results showed that the values ​​of pressure readings using the manufactured system are close to the values ​​of pressure readings obtained when using the F-Socket device. This indicates that the accuracy of the readings of the manufactured system and can be used for research purposes as well as in the process of placing pads in the appropriate place within the orthosis to correct the deformity or help to provide valuable information on the manufacturing, modification and fitting of prosthetic sockets. despite its simple structure and low cost as compared with F-Socket devise.

Development of a low cost portable pressure measurement system using for garment design

Measurement ◽  
2012 ◽  
Vol 45 (8) ◽  
pp. 2114-2120 ◽  
Author(s):  
Jin Li ◽  
Hao Liu ◽  
Yuxiu Wang ◽  
Lingling Shi ◽  
Fengxia He
Keyword(s):  
Measurement System ◽  
Pressure Measurement ◽  
Low Cost ◽  
Garment Design ◽  
Pressure Measurement System

Scientific validation of two commercial pressure sensor systems for prosthetic socket fit

2000 ◽  
Vol 24 (1) ◽  
pp. 63-73 ◽  
Author(s):  
A. A. Polliack ◽  
R. C. Sieh ◽  
D. D. Craig ◽  
S. Landsberger ◽  
D. R. McNeil ◽  
...  
Keyword(s):  
Measurement System ◽  
Pressure Measurement ◽  
Pressure Vessels ◽  
Interface Pressure ◽  
Sensor Performance ◽  
Prosthetic Socket ◽  
Socket Interface ◽  
Scientific Validation ◽  
Pressure Measurement System

The concept of measuring pressure at the interface between the stump and the prosthetic socket could provide valuable information in the process of prosthetic socket fabrication, modification, and fit. Two systems, the Rincoe Socket Fitting System (SFS) and Tekscan's FSocket Pressure Measurement System, have been commercially designed for in situ interface pressure measurement over the past decade. Their use is not common in prosthetic practice, perhaps due to questions of cost effectiveness and the difficulties of interpreting the data. Another concern is the use of sensors for pressure measurements in areas of high contour and complex geometries such as the stump. Before these systems can be used in a clinical setting, it is necessary to determine the reliability and accuracy of each system. In order to assess the clinical validity of the Rincoe SFS and FSocket systems, a series of trials was conducted to evaluate different aspects of sensor performance, namely; accuracy, hysteresis, drift and the effect of curvature. The sensors were subjected to tests in flatbed and customdesigned pressure vessels. Overall results indicated an accuracy error for the Rincoe SFS system of 25% (flatbed) and 33% (mould), with a corresponding 15% (flatbed) and 23% (mould) error in hysteresis, and 7% (flatbed) and 11% (mould) drift errors. The FSocket system demonstrated an 8% (flatbed) and 11% (mould) accuracy errors, 42% (flatbed) and 24% (mould) hysteresis errors, and 12% (flatbed) and 33% (mould) drift errors. These findings indicate favourable results for the FSocket Pressure Measurement System compared to the Rincoe Socket Fitting System with respect to its accuracy errors only. Nevertheless, it is the authors’ belief that these systems are adequate in indicating areas of high pressure at the stump socket interface for clinical purposes, but both systems should be used with caution.

Voice In Ear

2021 ◽  
Vol 5 (1) ◽  
pp. 1-25
Author(s):  
Yang Gao ◽  
Yincheng Jin ◽  
Jagmohan Chauhan ◽  
Seokmin Choi ◽  
Jiyang Li ◽  
...  
Keyword(s):  
User Authentication ◽  
Low Cost ◽  
The Body ◽  
Ear Canal ◽  
Replay Attacks ◽  
Increasing Demand ◽  
The Right ◽  
Sound Conduction ◽  
Enrollment Data ◽  
Secure Authentication

With the rapid growth of wearable computing and increasing demand for mobile authentication scenarios, voiceprint-based authentication has become one of the prevalent technologies and has already presented tremendous potentials to the public. However, it is vulnerable to voice spoofing attacks (e.g., replay attacks and synthetic voice attacks). To address this threat, we propose a new biometric authentication approach, named EarPrint, which aims to extend voiceprint and build a hidden and secure user authentication scheme on earphones. EarPrint builds on the speaking-induced body sound transmission from the throat to the ear canal, i.e., different users will have different body sound conduction patterns on both sides of ears. As the first exploratory study, extensive experiments on 23 subjects show the EarPrint is robust against ambient noises and body motions. EarPrint achieves an Equal Error Rate (EER) of 3.64% with 75 seconds enrollment data. We also evaluate the resilience of EarPrint against replay attacks. A major contribution of EarPrint is that it leverages two-level uniqueness, including the body sound conduction from the throat to the ear canal and the body asymmetry between the left and the right ears, taking advantage of earphones' paring form-factor. Compared with other mobile and wearable biometric modalities, EarPrint is a low-cost, accurate, and secure authentication solution for earphone users.

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