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Biomechanical engineering

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https://www.readbyqxmd.com/read/28919507/tissue-engineered-magnetic-cell-sheet-patches-for-advanced-strategies-in-tendon-regeneration
#1
Ana I Gonçalves, Márcia T Rodrigues, Manuela E Gomes
Tendons are powerful 3D biomechanically structures combining a few cells in an intrincated and highly hierarchical niche environment. When tendon homeostasis is compromised, restoration of functionality upon injury is limited and requires alternatives to current augmentation or replacement strategies. Cell sheet technologies are a powerful tool for the fabrication of living extracellular-rich patches towards regeneration of tenotopic defects. Thus, we originally propose the development of magnetically responsive tenogenic patches through magnetic cell sheet (magCSs) technology that enable the remote control upon implantation of the tendon-mimicking constructs...
September 14, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28917581/an-engineering-insight-into-the-relationship-of-selective-cytoskeletal-impairment-and-biomechanics-of-hela-cells
#2
Daniele Borin, Luca Puzzi, Valentina Martinelli, Matteo Cibinel, Romano Lapasin, Orfeo Sbaizero
It is widely accepted that the pathological state of cells is characterized by a modification of mechanical properties, affecting cellular shape and viscoelasticity as well as adhesion behaviour and motility. Thus, assessing these parameters could represent an interesting tool to monitor disease development and progression, but also the effects of drug treatments. Since biomechanical properties of cells are strongly related to cytoskeletal architecture, in this work we extensively studied the effects of selective impairments of actin microfilaments and microtubules on HeLa cells through force-deformation curves and stress relaxation tests with atomic force microscopy...
September 8, 2017: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/28914209/knee-ligament-injury-and-the-clinical-application-of-tissue-engineering-techniques-a-systematic-review
#3
Thomas Riley, Reza Mafi, Pouya Mafi, Wasim Khan
Background The incidence of knee ligament injury is increasing and represents a significant cost to healthcare providers. Current interventions include tissue grafts, suture repair and non-surgical management. These techniques have demonstrated good patient outcomes but have been associated graft rejection, infection, long term immobilization and reduced joint function. The limitations of traditional management strategies have prompted research into tissue engineering of knee ligaments. Objective This paper aims to evaluate whether tissue engineering of knee ligaments offers a viable alternative in the clinical management of knee ligament injuries...
September 15, 2017: Current Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28899825/long-term-performance-and-user-satisfaction-with-implanted-neuroprostheses-for-upright-mobility-after-paraplegia-two-to-14-year-follow-up
#4
Ronald J Triolo, Stephanie Nogan Bailey, Kevin M Foglyano, Rudi Kobetic, Lisa M Lombardo, Michael E Miller, Gilles Pinault
OBJECTIVE: To quantify the long-term (LT) (>2 years) effects of lower extremity (LE) neuroprostheses (NPs) for standing, transfers, stepping and seated stability after spinal cord injury. DESIGN: Single-subject design case series with participants acting as their own concurrent controls, including retrospective data review. SETTING: Hospital-based clinical biomechanics laboratory with experienced (>20 years in the field) research biomedical engineers, physical therapist and medical monitoring review...
September 9, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28891441/tissue-engineering-in-achilles-tendon-reconstruction-a-systematic-review-of-preclincal-studies
#5
Saqib Mir, Reza Mafi, Pouya Mafi, Wasim Khan
Background Tissue engineering is now being used in Achilles tendon (AT) repair in animal models. There are many preclinical studies that have used different types of stem cells for AT repair. However, there are no systematic reviews that evaluate all these studies to see which type of stem cell provides the most improvement for AT repair in animal models. Sahni V et al.,(1) divided the multiple stem cell types into three broad categories; Tendon derived stem cells (TDSCs), mesenchymal stem cells (MSCs) and embryonic stem cells (ESCs)...
September 6, 2017: Current Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28887585/biomechanical-properties-and-cellular-biocompatibility-of-3d-printed-tracheal-graft
#6
Yibo Shan, Yao Wang, Jianfeng Li, Hongcan Shi, Yiwei Fan, Junfeng Yang, Weidong Ren, Xi Yu
The goals of our study were to evaluate the biomechanical properties and cellular biocompatibility of 3D printed tracheal graft fabricated by polycaprolactone (PCL). Compared with native tracheal patch, there was a significant increase in maximum stress and elastic modulus for 3DP tracheal graft (p < 0.05). BMSCs were co-cultured under four different conditions to investigate cytotoxicity of the graft: (1) co-cultured with normal culture medium, as blank control; (2) co-cultured with perfluoropropylene, as negative control; (3) co-cultured with 3DP tracheal graft; and (4) co-cultured with polyvinyl chloride, as positive control...
September 8, 2017: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/28886204/stress-analysis-driven-design-of-bilayered-scaffolds-for-tissue-engineered-vascular-grafts
#7
Jason M Szafron, Christopher Breuer, Yadong Wang, Jay Humphrey
Continuing advances in the fabrication of scaffolds for tissue engineered vascular grafts is greatly expanding the scope of potential designs. Increasing recognition of the importance of local biomechanical cues for cell-mediated neotissue formation, neovessel growth, and subsequent remodeling is similarly influencing the design process. This study examines directly the potential effects of different combinations of key geometric and material properties of polymeric scaffolds on the initial mechanical state of an implanted graft into which cells are seeded or migrate...
September 8, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28872111/method-and-instrumented-fixture-for-femoral-fracture-testing-in-a-sideways-fall-on-the-hip-position
#8
Dan Dragomir-Daescu, Asghar Rezaei, Timothy Rossman, Susheil Uthamaraj, Rachel Entwistle, Sean McEligot, Vincent Lambert, Hugo Giambini, Iwona Jasiuk, Michael J Yaszemski, Lichun Lu
Mechanical testing of femora brings valuable insights into understanding the contribution of clinically-measureable variables such as bone mineral density distribution and geometry on the femoral mechanical properties. Currently, there is no standard protocol for mechanical testing of such geometrically complex bones to measure strength, and stiffness. To address this gap we have developed a protocol to test cadaveric femora to fracture and to measure their biomechanical parameters. This protocol describes a set of adaptable fixtures to accommodate the various load magnitudes and directions accounting for possible bone orientations in a fall on the hip configuration, test speed, bone size, and left leg-right leg variations...
August 17, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28869032/tissue-engineering-as-an-adjunct-to-pelvic-reconstructive-surgery
#9
Hanna Jangö
This PhD-thesis is based on animal studies and comprises three original papers and unpublished data. The studies were con-ducted during my employment as a research fellow at the Department of Obstetrics and Gynecology, Herlev University Hospital, Denmark. New strategies for surgical reconstruction of pelvic organ pro-lapse (POP) are warranted. Traditional native tissue repair may be associated with poor long-term outcome and augmentation with permanent polypropylene meshes is associated with frequent and severe adverse effects...
August 2017: Danish Medical Journal
https://www.readbyqxmd.com/read/28857659/cytocompatibility-and-biologic-characteristics-of-synthetic-scaffold-materials-of-rabbit-acellular-vascular-matrix-combining-with-human-like-collagen-i
#10
Xuqian Liu, Jie Wang, Fusheng Dong, Peng Song, Songbo Tian, Hexiang Li, Yali Hou
Scaffold material provides a three-dimensional growing environment for seed cells in the research field of tissue engineering. In the present study, rabbit arterial blood vessel cells were chemically removed with trypsin and Triton X-100 to prepare rabbit acellular vascular matrix scaffold material. Observation by He&Masson staining revealed that no cellular components or nuclei existed in the vascular intima and media after decellularization. Human-like collagen I was combined with acellular vascular matrix by freeze-drying to prepare an acellular vascular matrix-0...
January 1, 2017: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/28856135/plant-science-view-on-biohybrid-development
#11
REVIEW
Tomasz Skrzypczak, Rafał Krela, Wojciech Kwiatkowski, Shraddha Wadurkar, Aleksandra Smoczyńska, Przemysław Wojtaszek
Biohybrid consists of a living organism or cell and at least one engineered component. Designing robot-plant biohybrids is a great challenge: it requires interdisciplinary reconsideration of capabilities intimate specific to the biology of plants. Envisioned advances should improve agricultural/horticultural/social practice and could open new directions in utilization of plants by humans. Proper biohybrid cooperation depends upon effective communication. During evolution, plants developed many ways to communicate with each other, with animals, and with microorganisms...
2017: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/28854488/histological-and-biomechanical-characterization-of-decellularized-porcine-pericardium-as-a-potential-scaffold-for-tissue-engineering-applications
#12
Panagiotis Mallis, Efstathios Michalopoulos, Constantine Dimitriou, Nikolaos Kostomitsopoulos, Catherine Stavropoulos-Giokas
BACKGROUND: Each year, more than 800,000 vascular and cardiac surgeries are performed therefore, there is a great need for suitable material for bioprosthetic operations. Porcine pericardium is a double-walled sac that covers the heart and can be used in vascular and cardiac thoracic surgery. OBJECTIVE: The aim of the present study was to evaluate the decellularization process and biomechanical properties in porcine pericardial tissue after the decellularization treatment...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28852649/the-role-of-three-dimensional-scaffolds-in-treating-long-bone-defects-evidence-from-preclinical-and-clinical-literature-a-systematic-review
#13
REVIEW
Alice Roffi, Gopal Shankar Krishnakumar, Natalia Gostynska, Elizaveta Kon, Christian Candrian, Giuseppe Filardo
Long bone defects represent a clinical challenge. Bone tissue engineering (BTE) has been developed to overcome problems associated with conventional methods. The aim of this study was to assess the BTE strategies available in preclinical and clinical settings and the current evidence supporting this approach. A systematic literature screening was performed on PubMed database, searching for both preclinical (only on large animals) and clinical studies. The following string was used: "(Scaffold OR Implant) AND (Long bone defect OR segmental bone defect OR large bone defect OR bone loss defect)...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28843066/deriving-vascular-smooth-muscle-cells-from-mesenchymal-stromal-cells-evolving-differentiation-strategies-and-current-understanding-of-their-mechanisms
#14
REVIEW
Xiaoqing Zhang, Michelle P Bendeck, Craig A Simmons, J Paul Santerre
Vascular smooth muscle cells (VSMCs) play essential roles in regulating blood vessel form and function. Regeneration of functional vascular smooth muscle tissue to repair vascular diseases is an area of intense research in tissue engineering and regenerative medicine. For functional vascular smooth muscle tissue regeneration to become a practical therapy over the next decade, the field will need to have access to VSMC sources that are effective, robust and safe. While pluripotent stem cells hold good future promise to this end, more immediate translation is expected to come from approaches that generate functional VSMCs from adult sources of multipotent adipose-derived and bone marrow-derived mesenchymal stromal cells (ASCs and BMSCs)...
August 15, 2017: Biomaterials
https://www.readbyqxmd.com/read/28830261/multiple-stakeholder-perceptions-of-assistive-technology-for-individuals-with-cerebral-palsy-in-new-zealand
#15
Sarvnaz Taherian, Claire Davies
BACKGROUND: This study sought to gain an understanding of the experiences and perspectives of assistive technology from different stakeholders in technology adoption, in the New Zealand context. METHODS: A focus group was held with individuals with cerebral palsy (n = 5), service providers (n = 4), caregivers (n = 3) and a biomechanical engineer. The data recordings from the focus group were transcribed and coded using thematic analysis. RESULTS: Themes emerged around barriers imposed by the assessment process and training in assistive technology procedures, the influence of family members, the environment that assistive technology is used in, and psychosocial aspects of being able to participate and integrate into society...
August 23, 2017: Disability and Rehabilitation. Assistive Technology
https://www.readbyqxmd.com/read/28822738/a-study-of-the-damage-behaviour-of-porcine-intervertebral-discs-in-a-bioreactor-environment
#16
M Azarnoosh, M Stoffel, B Markert
The intervertebral discs are cartilaginous, articulating structures that lie between vertebral bodies, allowing flexibility, transmission, modification, and also distribution of the forces to the spinal column. Disc degeneration is characterised by progressive loss of disc height and exaggerated radial bulging. Therefore, the spine becomes shorter, stiffer, and less mobile. In the last several decades, there is a strong need for a tissue engineering strategy that alleviates pain and restores spine function by directly addressing the underlying biological causes of disc degeneration...
August 9, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28819758/an-in-silico-biomechanical-analysis-of-the-stent-esophagus-interaction
#17
Mathias Peirlinck, Nic Debusschere, Francesco Iannaccone, Peter D Siersema, Benedict Verhegghe, Patrick Segers, Matthieu De Beule
Despite all technological innovations in esophageal stent design over the past 20 years, the association between the stent design's mechanical behavior and its effect on the clinical outcome has not yet been thoroughly explored. A parametric numerical model of a commercially available esophageal bioresorbable polymeric braided wire stent is set up, accounting for stent design aspects such as braiding angle, strut material, wire thickness, degradation and friction between the wires comprising a predictive tool on the device's mechanical behavior...
August 17, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28817244/key-developments-that-impacted-the-field-of-mechanobiology-and-mechanotransduction
#18
Michelle Wall, David Butler, Alicia El Haj, Josephine C Bodle, Elizabeth G Loboa, Albert J Banes
Advances in mechanobiology have evolved through insights from multiple disciplines including structural engineering, biomechanics, vascular biology, and orthopaedics. In this paper, we reviewed the impact of key reports related to the study of applied loads on tissues and cells and the resulting signal transduction pathways. We addressed how technology has helped advance the burgeoning field of mechanobiology (over 33,600 publications from 1970 to 2016). We analyzed the impact of critical ideas and then determined how these concepts influenced the mechanobiology field by looking at the citation frequency of these reports as well as tracking how the overall number of citations within the field changed over time...
August 17, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28816441/an-integrated-design-material-and-fabrication-platform-for-engineering-biomechanically-and-biologically-functional-soft-tissues
#19
Onur Bas, Davide D'Angella, Jeremy G Baldwin, Nathan J Castro, Felix M Wunner, Navid T Saidy, Stefan Kollmannsberger, Alessandro Reali, Ernst Rank, Elena M De-Juan-Pardo, Dietmar W Hutmacher
We present a design rationale for stretchable soft network composites for engineering tissues that predominantly function under high tensile loads. The convergence of 3D-printed fibers selected from a design library and biodegradable interpenetrating polymer networks (IPNs) result in biomimetic tissue engineered constructs (bTECs) with fully tunable properties that can match specific tissue requirements. We present our technology platform using an exemplary soft network composite model that is characterized to be flexible, yet ∼125 times stronger (E = 3...
August 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28810594/tissue-engineered-sling-with-adipose-derived-stem-cells-under-static-mechanical-strain
#20
Ying Wang, Wei Wang, Xilong Wang, Yangyun Wang, Jihong Wang, Qiang Fu, Guowei Shi
The implantation of a suburethral sling is an important treatment for stress urinary incontinence (SUI). However, the slings used current have a number of inherent limitations, such as tissue rejection and infection. The present study investigated the potential of engineering sling tissue in vitro using adipose-derived stem cells (ADSCs). The ADSCs were obtained from Sprague-Dawley rats and were characterized in vitro. The ADSCs were seeded on polyglycolic acid (PGA) fibers that formed a scaffold with a shape mimicking a sling complex...
August 2017: Experimental and Therapeutic Medicine
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