The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In order to study the mechanism of the aqueous humor circulation and its relationship to the glaucoma macroscopically with engineering methods, a dynamistic model was presented, which can be used to simulate the situation and the treatment of the primary open angle glaucoma (POAG). The frame of the model was built based on the ophthalmically accepted feedback mechanism between the aqueous humor circulation...
In this study a telemedicine system based on embedded computer system is presented, which is designed specially for the need of immediate medical treatment in remote areas. In the system embedded Linux is cut down, customized and ported into the monitor terminal. Data interchange between the monitor center and the terminal via Internet and GPRS is introduced. This system which is convenient, portable...
Small animal imaging systems now allow researchers to non-invasively monitor the progression of diseases in living small animals and study the efficacy of drugs and treatment protocols. Magnetic resonance imaging (MRI) is an established imaging modality capable of obtaining high resolution anatomical images which are sensitive to blood volume, blood flow, and metabolic rate of oxygen. Optical tomography,...
High-intensity focused ultrasound (HIFU) has become a viable alternative for treatment of primary and metastatic liver tumors. We evaluated the effects of presence of a large blood vessel and its distance to the tumor on lesion size during HIFU heating. A finite element method (FEM) was used to obtain the temperature distribution for a transfer equation based on large blood vessels convection effect...
By cutting a spherical focused transducer into two coaxial and confocal transducer elements, a confocal complex transducer used in dual-frequency HIFU system was obtained. The lesion induced by dual-frequency HIFU in freshly excised porcine livers were obviously larger than that induced by conventional single-frequency HIFU at the same exposure conditions. The experiment results have also shown that...
The study was to investigate thrombolysis in vivo with ultrasound, and to discuss effects of thrombolysis with ultrasound on the structure of erythrocyte and its safety threshold, under different ultrasound intensity and exposure time. The structure of erythrocyte in thrombus was evaluated under light microscope. The relationship between the structure of erythrocyte in thrombus and ultrasound intensity...
Nano-structured four branched, blocked star vector (BSV) was molecularly designed by iniferter-based photo-living radical copolymerization method of N,N-dimethylaminopropylacrylamide and then N,N-dimethylacrylamide from four dithiocarbamate-derivatized benzene for a novel gene delivery non-viral vector. The conjugated pDNA complexes were satisfactorily stable in the condition of the electrophoresis...
We developed a new electroporation system, including a microchip and a logic circuit, and combining with the function of electrophoresis, which can site-specific enhancement of the gene concentration. We have demonstrated that the electroporation microchip could enhance and target in vitro gene transfection for cell lines. In this micro-device, the outer electrodes could provide the electrophoresis...
Bone mass loss caused by microgravity is considered as one of the worst influences to human body during long-term spaceflight. As one of the countermeasures to retain bone mass, muscle electrical stimulation is just started in spaceflight application and needs further research. This work is aimed to investigate the effects of muscle electrical stimulation based on the tail-suspended rat experiment...
The effectiveness of reperfusion therapies during acute brain ischemia depends on the viability of the underperfused tissue. Specifically, when the ischemia tissue is viable reperfusion leads to improved clinical outcome. However, when the ischemic tissue is non-viable, reperfusion therapy can lead to intra-cerebral hemorrhage and/or an accelerated rate of ischemia formation. Perfusion and diffusion...
The risk for cardiovascular disease is significantly high in diabetes mellitus. Experimental evidence suggests that oxidative stress plays a dominant role in the pathogenesis of diabetes mellitus. Carvedilol, a non-selective beta-adrenoceptor and selective alpha1-adrenoceptor blocker, also has antioxidant and free radical scavenger properties. In the present study the effect of carvedilol on the antioxidative...
More and more miniature medical devices (MMD), such as alimentary canal miniature drug delivering device, wireless endoscope, feeding tubes and treatment probes, have been researched and developed for clinical diagnosis and therapy. When a MMD was put into the human body for diagnosis and therapy, it is necessary to provide a non-invasive locating method that can locate the MMD in long-term. Here,...
The extracorporeal shock wave lithotripsy (ESWL) has come into wide use due to its non-invasive advantage. However, as for the shock wave propagation in human body in relation to practical lithotripsy, there are a few studies on numerical simulation based on models conforming to practical situations. In this paper we report a numerical method of finite difference time domain (FDTD) for analyzing ultrasonic...
The present work shows the development of a low-cost system to measure on-line blood urea concentration during dialysis procedures using optical sensor in the visible range. The objective in this project is obtaining the quantification of urea on-line during practices of the hemodialysis treatments. For which it has been considered to be a hypothesis that the dependence in the volume change of the...
The use of telemedicine in speech and language pathology provides patients in rural and remote areas with access to quality rehabilitation services that are sufficient, accessible, and user-friendly leading to new possibilities in comprehensive and long-term, cost-effective diagnosis and therapy. This paper discusses the use of online collaboration environments for various telemedicine applications...
Type 1 diabetes mellitus is a chronic disease characterized by blood glucose levels out of normal range due to inability of insulin production. This dysfunction leads to many short- and long-term complications. In this paper, a system for tele-monitoring and tele-management of type 1 diabetes patients is proposed, aiming at reducing the risk of diabetes complications and improving quality of life...
Physical inactivity is one of the risk factors of coronary heart disease. Physical activity protects against the development of CVD and also favorably modifies other risk factors, however a huge part of the population lead a relatively sedentary lifestyle. Virtual trainer (vt) concept is a technological platform for the controlled practice of physical training to achieve better cardiovascular fitness...
This paper briefly reports on preparations and applications of two kind multipurpose medical piezoelectrical ultrasonic transducer materials, high-performance medical ultrasonic diagnosis transducers and medical ultrasonic therapy transducers in present work, then, some problems of the piezoelectric materials and devices used for the ultrasonic medicine which need further researches are pointed out
To investigate changes in vascular functions in streptozotocin (STZ)-induced diabetic rats and the effect of interleukin-2 (IL-2), male Sprague-Dawley rats were randomly divided into a normal group, a diabetic control group, and diabetic groups treated with a low dose (5000 U/kg/d) or a high dose of IL-2 (50000 U/kg/d) for five weeks. Rats were injected with STZ (60 mg/kg, i.p.) to induce diabetes...
This computational study is motivated by the fact that there is still incomplete knowledge to date about hemodynamics of stented aortic arch aneurysms harboring a bleb. The hemodynamics in the stented and nonstented models of aortic aneurysms were analyzed and compared using the method of computational fluid dynamics. Flow activities inside the stented aneurysm model were significantly diminished,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.