(L-453) Flexible Resistance Testing and Design to Enhance Bilateral Golf Prostheses

Introduction:: The continual improvement of prosthetic devices is crucial to enhancing the quality of life for amputee golfers. This study focuses on further advancements in a bilateral trans-radial prosthetic prototype, specifically aiming to improve the resistance control mechanism during the golf swing. Previous iterations utilized separate bands and elastics to simulate wrist tension, but this version introduces a solid flexible member made of PLA material, capable of withstanding varying levels of resistance. Additionally, different patterns, including a straight and squiggly flexible S-shape, are integrated into the design to better emulate the tension experienced in a golfer's wrist during swings. The primary objective of this project is to design and verify the angular stiffness of the flexible member of the wrist, and to development parameters to create bespoke wrists of specific stiffness.

Materials and Methods:: Two sizes of distinct patterns were examined, generic straight members and a S-shape patterns each with different lengths and thicknesses, a few of the sizes tested are shown in figure 1. To assess the resistance characteristics accurately, a single column Instron load frame, with offset angled camps were utilized, as shown in figure 2. Using the force extension data from the Instron, the stiffness of each model was characterized.

Results, Conclusions, and Discussions:: Results in figure 1 showed that the small straight member demonstrated the greatest stiffness, effectively simulating wrist tension during a golf swing, while the other members displayed a plateau effect with minimal force generation. All four members exhibited durability, withstanding 20 cycles of 60mm displacement without breakages. The integration of PLA material and distinct patterns in the flexible members offers potential for tailored resistance control mechanisms. In conclusion, the small straight flexible member holds promise for enhancing the performance and swing experience of amputee golfers, and its adoption in the bilateral trans-radial prosthetic could lead to a more inclusive and effective solution for users. The findings highlight the need for further investigations to optimize the resistance thresholds of the flexible members and gather subjective feedback from amputee golfers on comfort and usability. Combining these results with biomechanical analyses can refine future iterations of the prosthetic, empowering amputee golfers to participate and excel in the sport with confidence and ease while maintaining mechanical integrity and dexterity options for individual preferences. By refining and optimizing the prosthetic design, the research contributes to the advancement of prosthetic technology and its application in sports, ultimately improving the quality of life and athletic experience for amputee golfers.

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