A New Method for Real-Time and In-Situ Characterization of the Mechanical and Material Properties of Biological Tissue Constructs PDF Download

Author: G. Zhang
Publisher:
ISBN:
Category : Biological tissue constructs
Languages : en
Pages : 14

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Book Description
To capture the transient, nonlinear and time-dependent characteristics of the mechanical and material properties of biomaterials and biological tissue constructs, we developed a real-time based evaluation method. This method measures the paired transient stress and strain as a function of time for a given material, and calculates instantaneously its complex modulus measurements as a function of frequency. Because the measured complex moduli contain not only the mechanical properties (magnitude of the modulus curves) but also the material characteristics (shape of the modulus curves), this method allows us to link directly the mechanical properties to the material characteristics in a real-time and in-situ manner. The significance of this capability is that the changes in both mechanical property and material structure can be correlated repeatedly during the growing or aggregating processes of the biological tissues or constructs.

Author: Eliane Schutte
Publisher: ASTM International
ISBN: 0803134711
Category : Biomedical materials
Languages : en
Pages : 267

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Book Description
Written by an international group of industry experts, regulators, and academics, this new ASTM publication provides the latest data on tissue engineering and the standards available for manufacturing TEMPs. Twenty-three peer-reviewed papers cover current technology, existing standards, development of new standards, and international standards used by regulatory bodies.

Author: Guigen Zhang
Publisher: Springer
ISBN: 3319174797
Category : Technology & Engineering
Languages : en
Pages : 108

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Book Description
This book gives a comprehensive overview of electrochemical-based biosensors and their crucial components. Practical examples are given throughout the text to illustrate how the performance of electrochemical-based biosensors can be improved by nanoscale surface modification and how an optimal design can be achieved. All essential aspects of biosensors are considered, including electrode functionalization, efficiency of the mass transport of reactive species, and long term durability and functionality of the sensor. This book also: · Explains how the performance of an electrochemical-based biosensor can be improved by nanoscale surface modification · Gives readers the tools to evaluate and improve the performance of a biosensor with a multidisciplinary approach that considers electrical, electrostatic, electrochemical, chemical, and biochemical events · Links the performance of a sensor to the various governing physical and chemical principles so readers can fully understand how a biosensor with nanoscale modified electrode surface functions.

Author: Melgardt M. de Villiers
Publisher: Springer Science & Business Media
ISBN: 0387776680
Category : Medical
Languages : en
Pages : 681

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Book Description
The reader will be introduced to various aspects of the fundamentals of nanotechnology based drug delivery systems and the application of these systems for the delivery of small molecules, proteins, peptides, oligonucleotides and genes. How these systems overcome challenges offered by biological barriers to drug absorption and drug targeting will also be described.

Author: Ryan K. Roeder
Publisher: Elsevier Inc. Chapters
ISBN: 0128070978
Category : Science
Languages : en
Pages : 71

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Book Description
The design of biomedical devices almost always involves some form of mechanical characterization of biomaterials. This chapter provides a broad overview of experimental methods and important considerations for mechanical characterization of biomaterials, with special attention to the practical needs of engineers and scientists who encounter a need to characterize the mechanical properties of a biomaterial but may not know where to begin or what the key considerations should be. Many details are necessarily omitted from this broad overview, but numerous references are provided for greater technical depth on a particular topic, standardized methodologies, and exemplary studies. Fundamental concepts are introduced, beginning with stress and strain versus force and displacement. The mechanical properties measured from a stress–strain curve, different types of stress–strain curves, and corresponding constitutive models are reviewed, including differences in material classes and anisotropy. Three primary methods of analysis for fracture mechanics are introduced, including stress concentrations, energy criteria for crack initiation and propagation (fracture toughness), and statistical methods for the probability of fracture. The mechanical characterization of biomaterials begins with selection and preparation of standardized test specimens, which are critical to obtaining accurate and reproducible measurements of material properties. Practical considerations are outlined for selection and preparation of the specimen size, geometry, surface finish, and precracking. The mechanical characterization of biomaterial test specimens always involves the application and measurement of load and deformation. Practical considerations are outlined for the selection and use of load frames, load cells, load fixtures, extensometers, and strain gauges. A number of common loading modes are introduced and compared: uniaxial tension, uniaxial compression, biaxial tension, torsion, diametral compression, three-point bending, four-point bending, and in-plane shear (including biomaterial-tissue interfacial shear strength). Strain-rate sensitivity or time-dependent behavior can profoundly influence stress–strain behavior and thus measured mechanical properties. The effects of high strain rates may be characterized by impact testing using a pendulum, drop tower, or split Hopkinson pressure bar. The effects of low strain rates may be characterized by creep deformation or creep rupture tests. The time-dependent behavior of viscoelastic materials is introduced, including creep, stress relaxation, common constitutive models, and practical considerations for testing. The frequency of loading, or cyclic loading, is another aspect of time-dependent behavior, which is critical for mechanical characterization of biomaterials, leading to fatigue deformation and failure or viscoelastic creep and stress relaxation. Practical considerations are described for selecting the waveform, frequency, cyclic stress/strain levels, loading mode, and test duration. Common methods are introduced for fatigue lifetime testing (including S-N curves, notch factors, and fatigue damage), fatigue crack propagation, and dynamic mechanical analysis (DMA). Nondestructive tests are particularly useful for sampling small volumes of a biomaterial (e.g., implant retrieval or biopsy) or characterizing spatial heterogeneity in mechanical properties. Various indentation tests and indenter geometries are introduced and compared, including classic hardness (Brinell and Rockwell), microhardness (Knoop and Vickers), and instrumented nanoindentation (Berkovich, cube corner, etc.). Methods and limitations are described for characterizing the reduced modulus, viscoelasticity, and fracture toughness using indentation. Ultrasonic wave-propagation methods are also introduced with an emphasis on methods for characterizing anisotropic elastic constants. Biomaterials are typically subjected to various sterilization methods prior to service and an aqueous physiological environment in service. Therefore, the effects of temperature, pressure, various aqueous media (water, phosphate buffered saline (PBS), media, foetal bovine serum (FBS), lipids, etc.), and irradiation on mechanical characterization of biomaterials are considered, including the degradation of mechanical properties by various mechanisms involving water uptake, hydrolysis, and oxidation. Finally, methods and guidelines are provided for data acquisition from transducers and data analysis, including an introduction to some basic statistical methods.

Author: M Jaffe
Publisher: Elsevier
ISBN: 0857093681
Category : Technology & Engineering
Languages : en
Pages : 337

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Book Description
Biomaterials and medical devices must be rigorously tested in the laboratory before they can be implanted. Testing requires the right analytical techniques. Characterization of biomaterials reviews the latest methods for analyzing the structure, properties and behaviour of biomaterials. Beginning with an introduction to microscopy techniques for analyzing the phase nature and morphology of biomaterials, Characterization of biomaterials goes on to discuss scattering techniques for structural analysis, quantitative assays for measuring cell adhesion, motility and differentiation, and the evaluation of cell infiltration and tissue formation using bioreactors. Further topics considered include studying molecular-scale protein-surface interactions in biomaterials, analysis of the cellular genome and abnormalities, and the use of microarrays to measure cellular changes induced by biomaterials. Finally, the book concludes by outlining standards and methods for assessing the safety and biocompatibility of biomaterials. With its distinguished editors and international team of expert contributors, Characterization of biomaterials is an authoritative reference tool for all those involved in the development, production and application of biomaterials. Reviews the latest methods for analyzing the structure, properties and behaviour of biomaterials Discusses scattering techniques for structural analysis, quantitative assays for measuring cell adhesion, and motility and differentiation Examines the evaluation of cell infiltration and tissue formation using bioreactors

Author: Arnab Chanda
Publisher: Springer
ISBN: 9789819922277
Category : Technology & Engineering
Languages : en
Pages : 0

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Book Description
This monograph brings forth biomechanical research methods and outcomes on human tissue experiments such as those of the brain and the heart under a single umbrella. Different mechanical characterization techniques employed in human tissue property estimation are presented in detail. The contents also focus on a hyperelastic constitutive model (e.g., Mooney-Rivlin, Ogden) for both isotropic and anisotropic tissue characterization. It also discusses energy dissipation in soft tissues and associated viscoelasticity. Human tissues, including skin, muscles, connective tissues, and tissues in all functional organs are listed and their mechanical properties are presented in detail. These tissue properties are indispensable for computational modeling of biological systems, validation of biomechanical tissue testing, medical simulation through development of artificial phantoms and surrogates, and testing of medical devices and interventions. This book will serve as a key reference forresearch in tissue engineering & biomedical engineering, medical simulation, biomechanics, finite element modeling of biological systems, biomaterials, biotechnology, implant and medical device development, and healthcare wearables.

Author: Samit K. Nandi
Publisher: Elsevier Inc. Chapters
ISBN: 012807101X
Category : Science
Languages : en
Pages : 53

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Book Description
The use of biomaterials has become indispensable in modern medicine that includes primarily for the restoration of function as well as drug carriers. Biomaterials developed for bone, cartilage, ligament, tendon, skeletal muscle, dental, and other musculoskeletal applications almost always necessitate mechanical properties characterization to guarantee that they are robust enough for their in vivo functionality. In addition, mechanical conditioning often has a direct consequence on cellular behaviors such as differentiation, extracellular matrix production, migration, and proliferation. There is imperative necessity to get real-time data of tissue development in vivo in response to various biomechanical stimuli such as tension/compression, bending, torsion, and steady or dynamic fluid flow of construct that allows experimental protocol changes to be made early. In vitro characterization is unable to exhibit the tissue response to materials, instead being limited to the response of individual cell lines or primary cells taken from animals. Considering the wide and ever-increasing use of biomaterials in different fields of veterinary and medical sciences with its effective use in emerging fields, the characterization in respect to cellular response in the living system and its effect thereafter for leading a physiologic life, a comprehensive understanding have to be developed in totality. Further, implant safety such as avoidance of adverse tissue reaction and resistance to wear and corrosion are of high clinical significance for implants used in long-term clinical situations. The characterization along with related factors like histological, histomorphological, biochemical, radiological, scanning and transmission electron microscopic, fluorochrome labelling, biomechanical, micro-CT analysis, immunohistochemistry in orthopaedic and soft tissue surgery have been tried to elucidate with emphasis on in vivo applications of biomaterials. Amid various characterization parameters, histology is one of the most important tools to assess cellular reactions in the implant–tissue interface that can be carried out by both undecalcified and decalcified bone specimens. Histomorphometry can directly help in quantitative measurement (percentage) of newly formed bone in the implanted scaffold using semiautomatic image analysis software and also sometimes determines the host's vascularization. Histochemistry can be used to observe connective tissue ingrowth within the scaffold. The morphology and the proliferating cells can be evaluated by immunohistochemical technique. Biochemical markers like serum calcium, phosphorus, alkaline phosphatase, and osteocalcin help in evaluating the progress of healing and tartrate-resistant acid phosphatase for determining the osteoclasts activity. To understand the mechanisms of unusual bone remodelling, a number of different fluorescent stains like calcein green, tetracycline, alizarin red derivatives and xylenol orange have been developed to detect and quantify bone mineralization. Angiogenesis within the scaffold can be observed and quantified by angiography, osteomedullography, micro-CT, immunostaining with von Willebrand factor stain and intravital microscopy. Biomechanical testing is essential for quantitative assessment of implant integration and contact percentage between implant materials with the host tissue and can be performed by pull-out or push-out tests. Surface analysis and the interaction with bone tissue can be best detected by scanning electron microscopy. Non-invasive techniques include radiological, micro-CT analysis, densitometry study and ultrasound elasticity imaging (UEI). Radiological study helps to assess the union at the host bone–implant interfaces during the follow-up period and should be carried out at regular and calculated interval. Micro-CT is also a non-invasive technique and has great potential in characterization of biomaterials in regard to pore size and spatial distribution of newly formed bone together with quantitative information. Densitometric evaluation is helpful for estimating bone mineral content and density. UEI provides more information of scaffold degradation and tissue development. Finally, targeted delivery system needs quantitative measurements of biodistributable materials which can be best accomplished by computed tomography (CT), fluorescence imaging, inductively coupled atomic emission spectroscopy, inductively coupled plasma-mass spectrometry, micro-positron emission tomography, MRI imaging, and radiography. This chapter is primarily on hands-on experience in surgical manipulation of different biomaterials like hydroxyapatite, tricalcium phosphate, bioactive glass, metals, chitosan, as well as natural coralline hydroxyapatite. Different characterization techniques elaborated in this chapter can show a road map to the researchers, scientists, teachers and readers in this field of biomaterials to understand fundamental aspects of materials and related tissue response to the system in vivo. It can also provide clues for further research in the future towards this emerging field.

Author: Gerhard A. Holzapfel
Publisher: Springer
ISBN: 9783540808626
Category : Science
Languages : en
Pages : 522

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Book Description

Author: Gerhard A. Holzapfel
Publisher: Springer Science & Business Media
ISBN: 9783540251941
Category : Computers
Languages : en
Pages : 546

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Book Description
The mechanics of biological tissues is a multidisciplinary and rapidly expanding area of research. The book points to important directions combining mechanical sciences with the exciting new developments in biology. It delivers state-of-the-art articles on: Mechanics of tissues at the molecular, cellular, tissue and organ levels. Mechanobiology, with particular reference to growth, remodeling, repair and aging. Experimental, microstructural and continuum mechanical perspectives with an emphasis on modelling, and simulating therapeutic and diagnostic procedures. Implementation of mechanical models in numerical codes to provide a tool for the design and development of prostheses. Numerical models have the potential to greatly improve diagnostics and therapeutical procedures that involve tissue mechanics.