Real time monitoring of transtibial elevated vacuum prostheses: A case series on socket air pressure
| Autor: | Paul D. Marasco, Edmond Lou, McNiel Keri, Michael R. Dawson, David Home, Jacqueline S. Hebert, Jonathon S. Schofield, Katherine R. Schoepp |
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| Přispěvatelé: | Eshraghi, Arezoo |
| Rok vydání: | 2018 |
| Předmět: |
Male
030506 rehabilitation Physiology lcsh:Medicine Walking Surveys Cardiovascular Accelerometer 0302 clinical medicine Gait (human) Prosthesis Fitting Surveys and Questionnaires Data logger Medicine and Health Sciences Case Series lcsh:Science Suspension (vehicle) Musculoskeletal System Gait Prosthetics Multidisciplinary Atmospheric pressure Physics Rehabilitation Amputation Stumps Classical Mechanics Middle Aged Laboratory Equipment Research Design Vacuum Apparatus Physical Sciences Engineering and Technology Female Slippage Anatomy Gait Analysis 0305 other medical science Research Article Biotechnology Adult Adolescent Vacuum General Science & Technology Clinical Research Design Equipment Bioengineering Artificial Limbs Research and Analysis Methods Prosthesis Design Young Adult 03 medical and health sciences Acceleration Amputees Clinical Research Pressure Humans Simulation Aged Air Pressure Survey Research Tibia Biological Locomotion System of measurement lcsh:R Biology and Life Sciences body regions Assistive Technologies Volume (thermodynamics) Body Limbs Gait analysis Environmental science lcsh:Q Medical Devices and Equipment Joints 030217 neurology & neurosurgery Biomedical engineering |
| Zdroj: | PLoS ONE PLoS ONE, Vol 13, Iss 10, p e0202716 (2018) PloS one, vol 13, iss 10 |
| ISSN: | 1932-6203 |
| DOI: | 10.1371/journal.pone.0202716 |
| Popis: | Elevated vacuum is a prosthetic suspension method used to reduce slippage between the prosthetic socket and the residual limb. Evaluation of the effectiveness of these systems is limited due to a lack of correlation to actual socket air pressure, particularly during unconstrained movements. This may explain some of the variability in functional outcomes reported in the literature. We developed a light-weight portable socket measurement system to quantify internal socket air pressure, temperature, and acceleration. We implemented the system onto the sockets of three transtibial prosthesis users with mechanical elevated vacuum pumps. Participants completed five functional tasks with and without the vacuum pumps actively connected, including the 2-Minute Walk test, 5-Times Sit-to-Stand test, 4-Square Step test, L-Test, and Figure-8 test. Results demonstrated that the use of elevated vacuum pumps produced different gait profiles and pressure ranges for each user, with significant differences between pump conditions. Two of the participants demonstrated substantially lower air pressure (higher vacuum) over time while the pump was active compared to inactive. The minimum air pressure measured at the completion of the 2-Minute Walk test was −34.6 ± 7.7 kPa, which is not as low as pressures reported in literature during benchtop experiments. One participant did not show substantial changes in pressure over time for either pump condition. Functional task performance was not significantly different between pump conditions. Correlation with accelerometer readings allowed air pressure data to be aligned with the gait cycle; peak positive pressures occurred just following initial contact of the foot in early stance, and the most negative pressures (vacuum) were observed throughout swing. This study has demonstrated the use of a portable data logging tool that may serve the clinical and research communities to quantify the operation of elevated vacuum systems, and better understand the variability of mechanical pump operation and overall system performance. |
| Databáze: | OpenAIRE |
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