Development of rotary-brake design in motorized upper limb prosthetics

Name: Wirawat Sirisopha

Organization : Mahidol University. Department of Biomedical Engineering

Name: Jackrit Suthakorn

Organization : Mahidol University. Department of Biomedical Engineering

Email : egjst@mahidol.ac.th

keyword: Upper-limb Prosthesis

ThaSH: Artificial arms -- Design

; Motorized Prosthesis

ThaSH: Elbow

; Clutch Mechanism

ThaSH: Prosthesis

Abstract: The technology on upper-limb prosthesis has been consequently improved to serve the patients' general needs for their living and life style. The needs include: (1) the need to re-gain their living abilities closed to normal people; (2) the need of prosthesis with cosmetic function (generally, a passive mechanism) and; (3) the need of prosthesis with a high-performance for sport activities [1]. Currently, the research on motorized upper-limb prosthesis has recently gained a momentum to improve the patients' even better living ability. However, a significant problem, which slows down the development, is the high-energy consumption on the motorized prosthesis, especially, at the elbow joint. This drawback is occurred when the amputee desires to move and hold their arms at a specific position while holding an object. The energy is drained during elbow's locking state as much as or greater than the moving state. The high-energy consumption problem would affect the prosthesis design at the power storage section. Therefore, this requires increasing the weight and cost. Our study introduces an approach to integrate a specific break/crutch onto the motorized joints of upper-limb prosthesis. However, such specific break/crutch is different in function, output-torque, material, weight and dimensions to the current availability in the industrial lines. Our study has found a suitably designed clutch system that reduces energy consumption but gives an appropriate output torque. Our study is also design a new crutch mechanism of non-backdrivable that provides two-directional rotation, called "2D Rotational Sprag Clutch," previously presented the conceptual design in [2]. The design and prototyping development of 2D Rotating Sprag Clutch is presenting in the paper. The initial test is also discussed, and has shown the good results.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2012

Modified: 2026-01-16

Issued: 2026-01-16

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BibliograpyCitation : ใน มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี คณะวิศวกรรมศาสตร์. การประชุมวิชาการเครือข่ายวิศวกรรมเครื่องกลแห่งประเทศไทย ครั้งที่ 26 (ME-NETT 2012) (DRC2072). กรุงเทพฯ : มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

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