A Comparison of Force Sensing for Applications in Prosthetic Haptic Feedback.
Crit Rev Biomed Eng
; 47(2): 109-119, 2019.
Article
em En
| MEDLINE
| ID: mdl-31679239
ABSTRACT
The current study presents a comparison of two load sensor designs that can be applied toward haptic feedback sensing in upper limb prosthetics. A lab-standard capacitive load cell sensor is discussed, which is succeeded by the proposal of an electrochemical sensor. Experiments were conducted primarily as a proof-of-principle study to evaluate sensor characteristics for prosthetic applications. The aim is to address the need for minimally invasive, cost-effective prosthetic sensor technologies, as the investigated sensor designs conceptualize applications of average grip forces. Thus, force requirements for the sensors were determined to be 250-500 N per the average maximum grip strength of healthy adults. Comparable to a commercial gold-standard capacitive load cell design, a lab-standard load cell sensor was inexpensively manufactured using conductive foam. The lab-standard design was improved upon by employing electrochemical techniques and CP-9000, a thermoplastic elastomer material, to form an electrochemical sensor for enhanced sensitivity. Sustained loads ranging from 0.49 to 2.45 N resulted in average maximum current readouts of - 1.25 × 10-1 to - 4.25 × 10-1 for the lab-standard sensor, and - 5.95 µA to - 7.85 µA for the electrochemical sensor. The electrochemical sensor was reproducible and demonstrated the potential to discriminate between various loads. Force requirements were not reached; however, future studies will seek to increase the mechanical strength of the electrochemical sensor. As the initial electrochemical sensor design provides a potential method for low-cost computer-based prosthetics, thermoplastic elastomer materials with increased elastic and mechanical strength properties will be investigated.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Desenho de Prótese
/
Membros Artificiais
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Eletrodos
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Retroalimentação Sensorial
Limite:
Humans
Idioma:
En
Revista:
Crit Rev Biomed Eng
Ano de publicação:
2019
Tipo de documento:
Article