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Design, construction and validation of a computer controlled system for functional loading of soft tissue


Colombo, V; Correro, M R; Riener, R; Weber, Franz E; Gallo, L M (2011). Design, construction and validation of a computer controlled system for functional loading of soft tissue. Medical Engineering and Physics, 33(6):377-683.

Abstract

Osteoarthritis is a chronic degenerative disease affecting body joints. Abnormal mechanical loading could be an initiating factor of cartilage damage, by influencing chondrocytes activity. To date, devices performing mechanical studies of viable tissues are mostly uniaxial. In this work, we developed and validated a multi-axial device for static and dynamic mechanical testing of viable soft tissues. The system, named RPETS, is composed of a motor driven indenter, moving vertically and horizontally along the bottom of a tank containing tissue samples and it can apply combined compression, sliding, and rolling on viable samples. Validation studies were performed with standard rubber and bovine nasal cartilage tissue. Static tests demonstrated that the system is comparable to existing uniaxial devices, with a maximum force control error smaller than 0.5N and a positioning resolution of 5μm. Dynamic tests performed with different motion profiles showed that the system can exert a load of 100N with a maximum velocity of 100mm/s maintaining the force control error within 10% of the desired value. Sinusoidal motion frequency can vary between 0.05 and 0.5Hz. In practical tests, viability staining of dynamically loaded cartilage slices showed extents of cell death to depend on the indenter velocity.

Abstract

Osteoarthritis is a chronic degenerative disease affecting body joints. Abnormal mechanical loading could be an initiating factor of cartilage damage, by influencing chondrocytes activity. To date, devices performing mechanical studies of viable tissues are mostly uniaxial. In this work, we developed and validated a multi-axial device for static and dynamic mechanical testing of viable soft tissues. The system, named RPETS, is composed of a motor driven indenter, moving vertically and horizontally along the bottom of a tank containing tissue samples and it can apply combined compression, sliding, and rolling on viable samples. Validation studies were performed with standard rubber and bovine nasal cartilage tissue. Static tests demonstrated that the system is comparable to existing uniaxial devices, with a maximum force control error smaller than 0.5N and a positioning resolution of 5μm. Dynamic tests performed with different motion profiles showed that the system can exert a load of 100N with a maximum velocity of 100mm/s maintaining the force control error within 10% of the desired value. Sinusoidal motion frequency can vary between 0.05 and 0.5Hz. In practical tests, viability staining of dynamically loaded cartilage slices showed extents of cell death to depend on the indenter velocity.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Division of Surgical Research
04 Faculty of Medicine > Balgrist University Hospital, Swiss Spinal Cord Injury Center
04 Faculty of Medicine > Center for Dental Medicine > Clinic for Cranio-Maxillofacial Surgery
04 Faculty of Medicine > Center for Dental Medicine > Clinic for Masticatory Disorders
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:2011
Deposited On:09 Mar 2011 15:07
Last Modified:21 Nov 2017 15:19
Publisher:Elsevier
ISSN:1350-4533
Funders:KFS.Sekretariat@zzm.uzh.ch
Publisher DOI:https://doi.org/10.1016/j.medengphy.2011.01.005
PubMed ID:21288758

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