Abstract：
:This paper describes the development and use of a direct compression stimulator for culturing explants from the meniscus of the knee and articular cartilage. Following design and fabrication of the instrument along with its data acquisition system, the function of the machine was verified by both mechanical means and tissue effect. The loading chamber can hold up to 45 5 mm diameter samples. While designed to stimulate samples up to 4 mm thick, axial displacements as little as 0.127 microm are within the theoretical capacity of the stimulator. In gene expression studies, collagen II and aggrecan expression were examined in explants from articular cartilage as well as medial and lateral menisci subjected to dynamic stimulation and static compression. These results were then compared to free swelling samples. It was found that static compression to cut thickness down-regulated aggrecan and collagen II expression in articular cartilage explants compared to free swelling controls by 94% and 90%, respectively. The application of a dynamic, intermittent, 2% oscillation around the cut thickness returned expression levels to those of free swelling controls at 4 h but not at 76 h. In medial meniscus samples, dynamic compression up-regulated aggrecan expression by 108%, but not collagen II expression, at 4 and 76 h compared to static controls. No difference in gene expression was observed for lateral meniscal explants. Thus, effects of direct compression seen in articular cartilage may not necessarily translate to the knee meniscus. The design of this stimulator will allow a variety of tissues and loading regimens to be examined. It is hoped that regimens can be found that not only return samples to the production levels of free swelling controls, but also surpass them in terms of gene expression, protein synthesis, and functional properties.
journal_name
Ann Biomed Engjournal_title
Annals of biomedical engineeringauthors
Aufderheide AC,Athanasiou KAdoi
10.1007/s10439-006-9157-xsubject
Has Abstractpub_date
2006-09-01 00:00:00pages
1463-74issue
9eissn
0090-6964issn
1573-9686journal_volume
34pub_type
杂志文章abstract：:This article presents an overview of time-resolved (lifetime) fluorescence techniques used in biomedical diagnostics. In particular, we review the development of time-resolved fluorescence spectroscopy (TRFS) and fluorescence lifetime imaging (FLIM) instrumentation and associated methodologies which allow in vivo char...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章,评审
doi：10.1007/s10439-011-0495-y
更新日期：2012-02-01 00:00:00
abstract：:Intracellular calcium concentration and transmembrane potentials are two important measurements used to study the mechanisms of cardiac activity. Fluorescent dyes have been used to measure these separately but not simultaneously in cardiac tissue. Fluo-3 and Fluo-4 (a recently improved version of Fluo-3) have been use...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1114/1.198
更新日期：1999-07-01 00:00:00
abstract：:The induction of angiogenesis is a promising therapeutic strategy for the amelioration of peripheral arterial disease (PAD). This occlusive disease results in muscle ischemia, and neovascularization is a route to increasing the perfusion in the tissue. The vascular endothelial growth factor (VEGF) family of potent pro...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-007-9303-0
更新日期：2007-06-01 00:00:00
abstract：:Congenital heart disease is the leading cause of infant death in the United States with over 36,000 newborns affected each year. Despite this growing problem there are few mechanical circulatory support devices designed specifically for pediatric and neonate patients. Previous research has been done investigating pedi...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-015-1370-z
更新日期：2016-04-01 00:00:00
abstract：:Tumor vasculature damage induced by various thermal treatments has been studied in vivo via laser confocal microscopy. Murine mammary carcinoma 4T1 was implanted in the nude mice dorsal skin fold window chamber. The implanted tumor was treated by alternate cooling and heating. Results showed that the treatment was muc...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-008-9511-2
更新日期：2008-08-01 00:00:00
abstract：:We propose a multifrequency energy transmission scheme for annular phased arrays in deep-body hyperthermia. The problem of frequency dependent resonance effects reported in hyperthermia phantom calibration studies, leading to skewed energy deposition patterns and unwanted energy maxima (hot spots), is addressed by com...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1114/1.1430749
更新日期：2002-01-01 00:00:00
abstract：:We develop a mathematical model of nanoparticles depositing onto and penetrating into a biofilm grown in a parallel-plate flow cell. We carry out deposition experiments in a flow cell to support the modeling. The modeling and the experiments are motivated by the potential use of polymer nanoparticles as part of a trea...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-012-0626-0
更新日期：2013-01-01 00:00:00
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journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-010-9972-y
更新日期：2010-07-01 00:00:00
abstract：:The effect of hemodynamic shear stress on endothelial gene expression was investigated in the porcine iliac arteries. A novel statistical approach was applied to computational fluid dynamics simulations of the iliac artery flow field to identify three anatomical regions likely to experience high, medium, and low level...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-010-0030-6
更新日期：2010-07-01 00:00:00
abstract：:Abnormal scapular movement is widely believed to be an important factor in clinical pathology of the shoulder joint complex. Validated non-invasive techniques for measuring scapular movement have been developed, but the effect of marker placement on accuracy is unknown. The objective of this study was to determine the...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-010-0185-1
更新日期：2011-02-01 00:00:00
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journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/BF02368042
更新日期：1989-01-01 00:00:00
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journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-006-9229-y
更新日期：2007-02-01 00:00:00
abstract：:The Veterans Health Administration determined that over 250,000 U.S. service members were diagnosed with a traumatic brain injury (TBI) between 2008 and 2018, of which a great proportion were due to blast exposure. Although the penetrating (secondary) and inertia-driven (tertiary) phases of blast-induced TBI (bTBI) ha...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-019-02437-4
更新日期：2020-04-01 00:00:00
abstract：BACKGROUND:We present a fundamental theoretical framework for analysis of energy dissipation in any component of the circulatory system and formulate the full energy budget for both venous and arterial circulations. New indices allowing disease-specific subject-to-subject comparisons and disease-to-disease hemodynamic ...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-009-9650-0
更新日期：2009-04-01 00:00:00
abstract：:Traumatic falls are a prevalent and costly threat to elderly adults. Accurate risk assessment is necessary for reducing incidence of falls. The objective of this study was to test the feasibility of a balance impairment detection model using tasks of sample categorization and falls risk estimation. Model design includ...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-005-2867-7
更新日期：2005-06-01 00:00:00
abstract：:One of the major functions of the cardiovascular system is to deliver blood to the microcirculation where exchange of mass and energy can take place. In the present article, we will provide an overview of the state-of-the-art computational methods for modeling of red blood cell (RBC) rheology and dynamics in the micro...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-005-8776-y
更新日期：2005-12-01 00:00:00
abstract：:The objective of this study was to develop a unique device for applying well-characterized cyclic, strain to cells growing on implant alloys. The device is based on the four-point bending principle and utilizes an electric motor, belt, and cam system to cyclically deflect a commercially pure titanium plate with cell c...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1114/1.1529195
更新日期：2002-11-01 00:00:00
abstract：:Tissue engineering strategies have utilized a wide spectrum of synthetic and naturally-derived scaffold materials. Synthetic scaffolds are better defined and offer the ability to precisely and reproducibly control their properties, while naturally-derived scaffolds typically have inherent biological and structural pro...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章,评审
doi：10.1007/s10439-014-1192-4
更新日期：2015-03-01 00:00:00
abstract：:The most widely implanted prosthetic valve is the mechanical bileaflet. Recent clinical experiences suggest that some designs are more prone to thromboembolic episodes than others. This study evaluated the hinge flow and near-field forward flow of the new St. Jude Medical Regent bileaflet mechanical heart valve. Laser...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1114/1.297
更新日期：2000-05-01 00:00:00
abstract：:Mild traumatic brain injury in sports has become a significant public health concern which has not only received the general public's attention through multiple news media stories involving athletic concussions, but has also resulted in local, state, and national legislative efforts to improve recognition and manageme...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章,评审
doi：10.1007/s10439-011-0413-3
更新日期：2012-01-01 00:00:00
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journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-017-1937-y
更新日期：2018-01-01 00:00:00
abstract：:The statistical distribution of von Mises stress in the trabeculae of human vertebral cancellous bone was estimated using large-scale finite element models. The goal was to test the hypothesis that average trabecular von Mises stress is correlated to the maximum trabecular level von Mises stress. The hypothesis was pr...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1114/1.1318928
更新日期：2000-01-01 00:00:00
abstract：:Dexterity of robots is highly required when it comes to integration for medical applications. Major efforts have been conducted to increase the dexterity at the distal parts of medical robots. This paper reports on developments toward integrating biocompatible conducting polymers (CP) into inherently dexterous concent...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-018-2038-2
更新日期：2018-10-01 00:00:00
abstract：:We hypothesize that variations of body anthropometry, conjointly with the bone strength, determine the risk of hip fracture. To test the hypothesis, we compared, in a simulated sideways fall, the hip impact energy to the energy needed to fracture the femur. Ten femurs from elderly donors were tested using a novel drop...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-020-02682-y
更新日期：2020-11-12 00:00:00
abstract：:Newborns with single ventricle physiology are usually palliated with a multi-staged procedure. When cardiovascular complications e.g., collateral vessel formation occur during the inter-stage periods, further treatments are required. An 8-month-old patient, who underwent second stage (i.e., bi-directional Glenn, BDG) ...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-014-1113-6
更新日期：2015-06-01 00:00:00
abstract：:Continuous flow left ventricular devices (CF-LVADs) support the failing heart at a constant speed and alters the loads on the aortic valve. This may cause insufficiency in the aortic valve under long-term CF-LVAD support. The aim of this study is to assess the aortic valve function under varying speed CF-LVAD support....
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-014-1204-4
更新日期：2015-08-01 00:00:00
abstract：:Normalized maximal ventricular power (nPWRmax) is an index of cardiac function which measures the innate blood pumping ability, or contractility, of the left ventricle (LV), and its noninvasive assessment could prove useful in a variety of patients. nPWRmax is defined as the maximum instantaneous product of LV pressur...
journal_title：Annals of biomedical engineering
pub_type： 临床试验,杂志文章
doi：10.1114/1.1415530
更新日期：2001-11-01 00:00:00
abstract：:The effects of training on a person's ability to perceive, interpret and utilize information presented via the tactile sense were examined by using a dual-channel electrocutaneous tracking approach. The electrocutaneous code studied was linear pulse rate encoding of information. The stimulus had a pulse width of 200 m...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/BF02367409
更新日期：1986-01-01 00:00:00
abstract：:Human stem cells hold significant potential for the treatment of various diseases. However, their use as a therapy is hampered because of limited understanding of the mechanisms by which they respond to environmental stimuli. Efforts to understand extracellular biophysical cues have demonstrated the critical roles of ...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/s10439-018-2008-8
更新日期：2018-06-01 00:00:00
abstract：:Measurement of the instantaneous pressure-volume relationship of the left ventricle is fundamental to the study of ventricular mechanics. In order to effectively investigate this relationship, it is necessary to vary and control the time course of ventricular volume change in a variety of prescribed manners. In the pa...
journal_title：Annals of biomedical engineering
pub_type： 杂志文章
doi：10.1007/BF02367387
更新日期：1982-01-01 00:00:00
