Mechanical Evaluation of Unity Elevated Vacuum Suspension System
Notice bibliographique
Résumé
BACKGROUND: Small residual limb-socket displacement is a good indicator of prosthetic suspensionsystem quality. Active vacuum suspension systems can decrease vertical movement inside the socket,compared to non-active suction systems. This study mechanically evaluated limb-socket displacementwith the Össur Unity active vacuum system. METHOD: Forty-eight conditions were evaluated: four cylindrical and four conical sockets(polypropylene, polyethylene terephthalate glycol-modified (PETG), thermoset resin (acrylic),Thermolyn soft materials); two Iceross Seal-In V liners (standard, high profile); three vacuumconditions (active vacuum, inactive vacuum, no suction with valve open). An Instron 4428 test machineapplied 0-100N linear ramped tensile loads to each positive mold, with the socket secured in place,while displacement between the mold and socket was recorded. Following the displacement tests, theload before failure (i.e., 10 mm displacement) was measured. RESULTS: Average and standard deviations for movement between the mold and sockets were small.The displacement average for all conditions was 0.30±0.16mm for active vacuum, 0.32±0.16mm forinactive vacuum, and 0.39±0.22mm for no suction. Across all trials, active vacuum systems toleratedsignificantly (p<0.001) more load before failure (812±221N) compared to inactive vacuum (727±213N),and no suction (401±184N). The maximum load before failure (1142±53N) was for the cylindricalpolypropylene socket and high-profile liner. CONCLUSION: The Unity system successfully controlled pistoning inside the socket for regularactivity loads and also controlled the greatest traction loads. While relative movement was smallestfor Unity, all conditions (inactive vacuum, no suction) were viable for loads less than 100N.Furthermore, similar results can be achieved when using different socket fabrication materials. LAYMAN’S ABSTRACT: Prosthetic technology innovation is essential to enhance amputee's quality of life because amputation causes a permanent disability and people with limb loss rely on prostheses for the rest of their lives. The method for attaching a prosthesis to the body is termed prosthetic suspension. Selecting a suitable suspension system is an important step in the prosthetic rehabilitation process. Recently, the Unity elevated vacuum suspension system (https://assets.ossur.com/library/31882/IFU) was developed by Össur. Understanding of how the Unity elevated vacuum system controls limb movement within the socket, with different socket materials, is important to guide prosthetic prescription. Therefore, mechanical testing was conducted to provide quantitative evidence to guide clinical practice. This study showed that the Unity system can hold the residual limb inside the socket successfully even if there is a failure in the vacuum pump. Elevated vacuum made the socket harder to pull off, which is beneficial in cases where the prosthetic foot is snagged during movement. Article PDF Link: https://jps.library.utoronto.ca/index.php/cpoj/article/view/32941/25960 How to Cite: Gholizadeh H, Lemaire ED, Salekrostam R. Mechanical evaluation of unity elevated vacuum suspension system. Canadian Prosthetics & Orthotics Journal. 2019;Volume2, Issue2, No.5. https://doi.org/10.33137/cpoj.v2i2.32941 *CORRESPONDING AUTHORHossein Gholizadeh,BSc (P&O), MEng.Sc, PhD,Ottawa Hospital Research Institute, Centre for Rehabilitation Research and Development, Ottawa, Canada.Email: gholizadeh87@yahoo.comORCID: https://orcid.org/0000-0001-5847-7985
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,002 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».