A Study of Tibial Motion Accuracy using Circular and Noncircular Gears in a Transfemoral Prosthetic Knee Part 1: Tibial Motion Acquisition

經股人工膝關節使用圓形與非圓形齒輪進行脛骨運動精度的研究　第一部分：脛骨運動擷取

李文宗(Wen-Tzong Lee) ； 羅素凱文(Kevin Russell) ； 索德里拉兹(Raj S. Sodhi)

《中國機械工程學刊》 42卷6期 (2021/12) Pp. 613-618

摘要

This is the first part of a two-part work where the authors' design method for gear-based transfemoral prosthetic knees is demonstrated using knee motion data from 7 clinical knee motion studies. The purpose of this two-part work is to determine if circular gears can consistently exhibit accurate tibial motion during gait versus noncircular gears in a transfemoral prosthetic knee. In part 1, tibial positions reflecting tibial motion during gait are calculated using the knee motion data presented in the 7 clinical knee motion studies. These studies reflect factors such as participant age, gender, nationality, body mass index, gait speed and knee condition. Unlike noncircular gears, which are custom-made, circular gears can offer advantages in manufacturing cost and design simplicity since it is a standard component. However, to justify the use of circular gears in the knee design, it must be determined if it can consistently exhibit tibial motion that is as accurate as noncircular gears.

關鍵字

Prosthetic Knee ； RRSS Linkage ； Motion Generation ； Axode Generation ； Circle Fitting ； Gears Design

並列摘要

這是兩個相關研究的第一部分。作者們使用七項臨床膝關節運動研究的膝關節運動數據，示範應用齒輪為基礎的經股人工膝關節的設計方法。這兩個相關研究的主要目的是測試圓形齒輪與非圓形齒輪在經股人工膝關節的步態過程中，是否都能夠始終如一地表現出準確的脛骨運動。在第一部分中，使用七項臨床膝關節運動研究提供的膝關節運動數據，計算反映步態過程中脛骨運動的位置。這些研究反映了參與者的年齡、性別、國籍、體重指數、步態速度與膝關節狀況等因素。與需要客制化的非圓形齒輪不同的地方，圓形齒輪在製造成本和設計簡易性方面均具有優勢，因為它是屬於標準製造的零件。然而，為了證明在膝關節設計中使用圓形齒輪是合適的，必須確定它是否可以始終如一地表現出與非圓形齒輪一樣準確的脛骨運動。