Endpoint Control for a Powered Shoulder Prosthesis

Phillips, Sam L.; Resnik, Linda; Fantini, Christopher; Latlief, Gail

doi:10.1097/jpo.0000000000000006

Cited by 9 publications

(12 citation statements)

References 17 publications

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“…All configurations of the device have a wrist display which shows the grip pattern that is currently selected as well as the mode of operation. The HC DEKA Arm uses control inputs for the movements of elbow flexion and extension and humeral internal and external rotation; the SC DEKA Arm uses a unique control strategy called Endpoint control [ 3 ]. Both the RC and HC devices utilize an external battery pack, typically worn on a belt secure around the waist.…”

Section: Introductionmentioning

confidence: 99%

User experience of controlling the DEKA Arm with EMG pattern recognition

2018

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IntroductionA commercially available EMG Pattern Recognition (EMG-PR) control system was adapted to interface with the multi-degree of freedom (DOF) DEKA Arm.PurposeTo describe users’ experience of controlling the DEKA Arm using EMG-PR.MethodsSample: Twelve persons with upper limb amputation participated, 10 with transradial (TR), 2 with transhumeral (TH) level amputation. Ten were male, and 11 were users of a prosthesis at baselines. Design: This was a two-part study consisting of in-laboratory prosthetic training (Part A) and up to 12 weeks of home use of the prosthesis (Part B). Data collection: Qualitative data were collected through open-ended survey questions and semi-structured interviews. Data Analysis: The study used a qualitative case series design with a constant comparative approach to identify common categories of experience. Coding categories were iteratively refined until saturation of categories was achieved. The data were organized in a primary category, major categories of experience, factors impacting experience, and broader contextual factors.ResultsUsers had mixed perspectives on the desirability of the EMG-PR control system in combination with the DEKA Arm. Major aspects of user experience related to the system complexity, process of calibrating, and functional benefits. Factors influencing user experience included training and acclimation, fatigue, prosthesis design, technical issues and control changes. Broader contextual factors, both personal and environmental, also impacted users’ experience.Discussion/ConclusionThis study provided an in-depth description of user experience operating the DEKA Arm using EMG-PR control. The majority of participants expressed a preference for the controls of their personal prosthesis and controls rather than the iteration of EMG-PR controlled DEKA Arm used in this study. Most were positive about the future potential of EMG-PR as a control method. An understanding of patient experience will assist clinicians and patients choosing prosthetic options.

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Section: Introductionmentioning

confidence: 99%

User experience of controlling the DEKA Arm with EMG pattern recognition

2018

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“…The SC has additional powered shoulder movements and is controlled by Endpoint control which allows simultaneous joint control. [ 3 ] The DEKA Arm is controlled primarily with inertial measurement units (IMUs) secured to top of the shoes. However this control method may be supplemented by electromyography (EMG) controls, pressure transducers, and conventional controls such as linear transducers, and rocker or other switches.…”

Section: Introductionmentioning

confidence: 99%

How do the outcomes of the DEKA Arm compare to conventional prostheses?

et al. 2018

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ObjectivesObjectives were to 1) compare self-reported function, dexterity, activity performance, quality of life and community integration of the DEKA Arm to conventional prostheses; and 2) examine differences in outcomes by conventional prosthesis type, terminal device type and by DEKA Arm configuration level.MethodsThis was a two-part study; Part A consisted of in-laboratory training. Part B consisted of home use. Study participants were 23 prosthesis users (mean age = 45 ± 16; 87% male) who completed Part A, and 15 (mean age = 45 ± 18; 87% male) who completed Parts A and B. Outcomes including self-report and performance measures, were collected at Baseline using participants’ personal prostheses and at the End of Parts A and B. Scores were compared using paired t-tests. Wilcoxon signed-rank tests were used to compare outcomes for the full sample, and for the sample stratified by device and terminal device type. Analysis of outcomes by configuration level was performed graphically.ResultsAt the End of Part A activity performance using the DEKA Arm and conventional prosthesis was equivalent, but slower with the DEKA Arm. After Part B, performance using the DEKA Arm surpassed conventional prosthesis scores, and speed of activity completion was equivalent. Participants reported using the DEKA Arm to perform more activities, had less perceived disability, and less difficulty in activities at the End of A and B as compared to Baseline. No differences were observed in dexterity, prosthetic skill, spontaneity, pain, community integration or quality of life. Comparisons stratified by device type revealed similar patterns. Graphic comparisons revealed variations by configuration level.ConclusionParticipants using the DEKA Arm had less perceived disability and more engagement of the prosthesis in everyday tasks, although activity performance was slower. After home use experience, activity performance was improved and activity speed equivalent to using conventional prostheses.

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“…The device is operated by a combination of methods that includes foot controls, optional EMG controls, pressure switches, or other commonly available prosthetic input elements. The DEKA Arm system that includes a powered shoulder employs end-point control that enables simultaneous control of multiple arm joints, minimizing the cognitive burden required to control all upper-limb joints separately [14][15]. The mechanical properties of the DEKA Arm are easy to observe.…”

Section: Introductionmentioning

confidence: 99%

Self-reported and performance-based outcomes using DEKA Arm

et al. 2014

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Abstract-Mechanical properties of the DEKA Arm and associated engineering innovations are easy to observe. What is less clear is how these advances translate into functional benefits for the user with amputation. Study aims were to (1) quantify outcomes including dexterity, performance of daily activities, and prosthetic skill and spontaneity of users of the DEKA Arm and (2) compare outcomes when using the DEKA Arm with scores using the existing prosthesis. This was a quasi-experimental study. Descriptive analyses examined outcomes by DEKA Arm configuration level. Of the 39 subjects fit with a DEKA Arm, 32 were trained in use and completed end-of-study testing. Data from 26 prosthetic users were used to compare outcomes using existing prostheses with outcomes with the DEKA Arm. Dexterity and activity performance with the DEKA Arm varied by amputation level (p < 0.01). Self-reported function and number of activities performed using the prosthesis were similar across levels. Comparisons with existing prostheses showed the effect on dexterity varied by level. Activity performance and spontaneity of prosthetic use improved for users of the shoulder configuration level, while use of the prosthesis to perform activities and perceived difficulty performing self-selected tasks improved for all levels.

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Endpoint Control for a Powered Shoulder Prosthesis

Cited by 9 publications

References 17 publications

User experience of controlling the DEKA Arm with EMG pattern recognition

User experience of controlling the DEKA Arm with EMG pattern recognition

How do the outcomes of the DEKA Arm compare to conventional prostheses?

Self-reported and performance-based outcomes using DEKA Arm

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