Design, Manufacture, and Evaluation of an Assistive Device to aid Transhumeral Amputee with Fishing

Name: Maram Alahmadi

Abstract

Study design: Case report

Background: The subject has a unilateral right side transhumeral amputation following a work accident in 2019. He lives by the coast of Largs in Scotland and enjoys fishing most days. Following the amputation, he uses only his left arm to support the fishing rod under the axilla. Thus, causing tiredness and breakage of the reel. Thus, he would like a device that could help with his hobby

Objectives: To design, manufacture, fit and evaluate an assistive device that meets the participant needs. Furthermore, reducing the risk of developing overuse syndrome and musculoskeletal pain by offloading the left arm. In addition to preventing the reel from breakage.

Method: A customized frame was manufactured following a traditional casting method. Suspension included a shoulder and a waist strap. Lastly, The operating mechanism method involves three main components which are the tube, semi-automatic joint, and the p-loop. The tube holds the fishing rode, with a quick releasing mechanism where the fishing reel is rotated to release. The semiautomatic lock allows 0-90° of motion and has a simple manual lock that the participant can use to lock the joint in the desired position. The movement of the joint is operated by the residuum movement through the p-loop, with humerus flexion the tube/joint complex is lifted up.

Results: Pugh matrix results showed satisfaction of the device when compared to 8 other alternatives in term of stability, position, and movement. In addition to the light weight of 1.2 kg. The diary illustrated increase time spent fishing without feeling fatigued. However, the cost of the device is considerably high compared to the alternatives in the market. Conclusion:

Future development could involve means to reduce the cost of the device by using local and affordable materials. Moreover, evaluation methods including digital diary and stress testing could enhance the quality of the results.