In-socket sensory system for transfemoral amputees using piezoelectric sensors: An efficacy study
This paper presents the design and evaluation of an in-socket sensory system for a transfemoral prosthetic leg using a set of piezoelectric sensors. The design process includes identifying the optimal mounting configuration of the sensors and determining their best placement. Two experiments we...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English English |
| Published: |
IEEE
2016
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/53928/ http://irep.iium.edu.my/53928/ http://irep.iium.edu.my/53928/ http://irep.iium.edu.my/53928/1/J-2016-IEEE-ASME%20MCT-In%20socket%20sensory%20system-Farah-published.pdf http://irep.iium.edu.my/53928/7/53928-In-Socket%20Sensory%20System%20for%20Transfemoral%20Amputees%20Using%20Piezoelectric%20Sensors_SCOPUS.pdf http://irep.iium.edu.my/53928/8/53928-In-Socket%20Sensory%20System%20for%20Transfemoral%20Amputees%20Using%20Piezoelectric%20Sensors_WOS.pdf |
| Summary: | This paper presents the design and evaluation
of an in-socket sensory system for a transfemoral prosthetic
leg using a set of piezoelectric sensors. The design process
includes identifying the optimal mounting configuration
of the sensors and determining their best placement. Two
experiments were performed separately to address each objective.
Results of the experiment suggested that cushionall
with fit size cantilever with elastic foundation should be
adopted to mount the sensors on the socket’s wall. As for
the placement of the sensors, the result suggested that the
sensors should be positioned in zig-zag orientation from
top to bottom, which can cover all of the most active area
on the quadriceps and hamstring muscle groups. With the
identified design, the socket was fabricated and instrumented
for a transfemoral amputee and the performance of
the in-socket sensory system was evaluated. The amputee
performed level walking at normal speed on a 5-m straight
pathway multiple times while the output voltage signal from
each sensor was recorded. The output signals consistency
was assessed by calculating the cross correlation, r, within
five trials. In order to measure the strength of the correlation
matrix of each sensor, the Frobenius norm, ||A||F
was calculated. The high norm value for all sensors pattern
(||A||F >4.5) for quadriceps implies that the mounting and
placement of the sensors is most suitable for a consistent
and reliable signal. For Hamstring, results inferred that
except for the two sensors located on the top most position
and the most bottom sensor, the other sensors showed
good performance (||A||F >4.4). Thus, the proposed design
of the in-socket sensory system using piezo sensors was
proven to be effective for a transfemoral prosthetic leg. |
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