TY - JOUR
T1 - Design and Anchorage Dependence of Shape Memory Alloy Actuators on Enhanced Voiding of a Bladder
AU - Hassani, Faezeh Arab
AU - Gammad, Gil Gerald Lasam
AU - Mogan, Roshini Priya
AU - Ng, Tze Kiat
AU - Kuo, Tricia Li Chuen
AU - Ng, Lay Guat
AU - Luu, Percy
AU - Thakor, Nitish V.
AU - Yen, Shih Cheng
AU - Lee, Chengkuo
N1 - Funding Information:
The authors would like to acknowledge financial support from following research grants: NRF-CRP10-2012-01 “Peripheral Nerve Prostheses: A Paradigm Shift in Restoring Dexterous Limb Function” and NRF-CRP8-2011-01 “Self-powered body sensor for disease management and prevention-orientated healthcare” from the National Research Foundation (NRF), Singapore, and Faculty Research Committee (FRC) grant “Thermoelectric Power Generator (TEG) Based Self-Powered ECG Plaster—System Integration (Part 3)” at the National University of Singapore. F.A.H. and C.L.: device design concept. F.A.H.: device modeling, fabrication, and characterization. F.A.H. and S.-C.Y.: experimental design and setup, and in vivo test data interpretation. G.G.L.G. and R.P.M.: animal surgeries. F.A.H.: in vivo test setup and device implantation on bladder. T.K.N., T.L.C.K., L.G.N., and P.L.: provided idea and motivation for bladder contraction device. N.V.T., S.-C.Y. and C.L.: principal investigators, study design, data interpretation.
Publisher Copyright:
© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2018/1
Y1 - 2018/1
N2 - The use of shape memory alloy (SMA) actuators to restore voiding of bladder for myogenic under active bladder (UAB) patients is proposed recently. Even though previous work show the unique capability of this technology for bladder voiding, the low voiding volume and high energy consumption of the device limit the advancement of this technique. This study proposes a novel approach using an interlaced configuration to overcome these limitations. In this device, SMA actuators are threaded through rigid anchor points of the flexible vest. The novel anchorage of SMA actuators provides more conformability for the vest and lower energy consumption for the device, while the new interlaced configuration enhances the voiding volume. The device is tested initially on a rubber model for the bladder, then it is implanted in an anesthetized rat, and a voiding volume of more than 20% at 4 V is successfully achieved. A commercial force sensor is integrated with the device to make it suitable for neurogenic UAB patients. The sensor provides a feedback control signal to the patient to initiate the actuation of the device upon fullness of bladder. The overall system is a promising advance over the state-of-the-art providing bladder voiding in UAB patients.
AB - The use of shape memory alloy (SMA) actuators to restore voiding of bladder for myogenic under active bladder (UAB) patients is proposed recently. Even though previous work show the unique capability of this technology for bladder voiding, the low voiding volume and high energy consumption of the device limit the advancement of this technique. This study proposes a novel approach using an interlaced configuration to overcome these limitations. In this device, SMA actuators are threaded through rigid anchor points of the flexible vest. The novel anchorage of SMA actuators provides more conformability for the vest and lower energy consumption for the device, while the new interlaced configuration enhances the voiding volume. The device is tested initially on a rubber model for the bladder, then it is implanted in an anesthetized rat, and a voiding volume of more than 20% at 4 V is successfully achieved. A commercial force sensor is integrated with the device to make it suitable for neurogenic UAB patients. The sensor provides a feedback control signal to the patient to initiate the actuation of the device upon fullness of bladder. The overall system is a promising advance over the state-of-the-art providing bladder voiding in UAB patients.
KW - anchorage and design
KW - flexible electronics
KW - force sensors
KW - neurogenic under active bladder
KW - shape memory alloy actuators
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U2 - 10.1002/admt.201700184
DO - 10.1002/admt.201700184
M3 - Article
AN - SCOPUS:85040666566
SN - 2365-709X
VL - 3
JO - Advanced Materials Technologies
JF - Advanced Materials Technologies
IS - 1
M1 - 1700184
ER -