National Repository of Grey Literature 4 records found  Search took 0.01 seconds. 
Materials for photovoltaic neurostimulators based on silicon photodiodes
Kunovský, Ondřej ; Weiter, Martin (referee) ; Glowacki, Eric Daniel (advisor)
Tato práce je zaměřena na možnosti neurostimulátorů s bezdrátovým přenosem energie, konkrétně se zabývá přenosem energie pomocí světla. Běžně používané neurostimulátory zahrnují bateriově napájené implantovatelné pulzní generátory a trpí problémem objemných baterií, které vyžadují invazivnější operace a nutnost periodické výměny. V této práci je zkoumána alternativa přenosu energie s využitím fotovoltaických diod. Monokrystalické křemíkové fotovoltaické diody jsou modifikovány a používány pro přeměnu energie ze světelné na elektrickou. Tyto diody byly rozřezány na různé velikosti aktivních ploch a byly zapojeny do sériových nebo paralelních zapojení. Tyto fotovoltaické články byly spojeny s elektrodami vyrobenými z osmi různých materiálů a se čtyřmi různými velikostmi fotovoltaických diod, aby pokryly širokou škálu možných neurostimulačních aplikací. Dále byl vyroben prototyp fotovoltaického stimulátoru skládající se z flexibilních elektrod a fotovoltaické diody. Tento prototyp byl úspěšně testován na modelech malých zvířat, kterými byli Hirudo verbena a Locusta migratoria. Tato práce charakterizuje řadu kombinací jednotlivých velikostí a materiálů elektrod s fotovoltaickými diodami pro různé intenzity a frekvence světla a vytváří mapu relevantních parametrů, z nichž lze navrhnout prototyp stimulátoru pro konkrétní aplikaci. Tato práce pokládá základ pro další vývoj fotovoltaických neurostimulátorů, které umožní nové experimenty a jednoho dne možná méně invazivní klinická zařízení.
External pulse generator for neuromodulation
Flídr, Lukáš ; Říčný, Václav (referee) ; Chmelař, Milan (advisor)
This thesis deals with the treatment of chronic pain by using neuromodulation, where a external generator is used in a trial period. In the first section the principle of pain management is described and then the main nature of neuromodulation. The possibilities of chronic pain suppression are described, where we are mainly dealing with neurostimulation (stimulation with electric current). For better understanding, examples of neurostimulation usage are shown, where and in what problems it is used. Because this work deals with an external generator for a trial period (a trial system), the possibilities of testing electric impulses are described, which are then used in a implantable generator IPG. The requirements for such a external generator are also described, which are important for the design of such a device. The design of the device is firstly modeled by a block scheme, where function of the separate blocks is described and afterwards, the entire design of the external generator for neuromodulation is given. The test sample of the external generator is manufactured and tested.
Acceleration of Ultrasound Neurostimulation Using Mixed-Precision Arithmetic
Duchoň, Radek ; Olšák, Ondřej (referee) ; Jaroš, Jiří (advisor)
K-Wave is an open source tool for acoustic and ultrasound simulation. Current available implementations are written in C++ and Matlab. The aim of this thesis is to accelerate the existing implementation of ultrasound simulation by means of lower precision calculations on Nvidia graphics cards using the CUDA software platform. Another benefit of this work should be a reduced memory requirement, which will enable larger simulations to be performed. However, due to the use, for example, for neurostimulation of the brain, the reduced accuracy must not disturb the results as a whole too much. It is therefore important to identify suitable quantities that can be stored in lower precision. In this work, possible approaches and their effectiveness in utilizing lower precision will be analyzed. Furthermore, a solution proposal will be made, which will include identifying potential variables for reduction. This will be followed by specifying the achieved implementation and its testing. The conclusion will focus on evaluating the solution based on the results obtained from the testing.
External pulse generator for neuromodulation
Flídr, Lukáš ; Říčný, Václav (referee) ; Chmelař, Milan (advisor)
This thesis deals with the treatment of chronic pain by using neuromodulation, where a external generator is used in a trial period. In the first section the principle of pain management is described and then the main nature of neuromodulation. The possibilities of chronic pain suppression are described, where we are mainly dealing with neurostimulation (stimulation with electric current). For better understanding, examples of neurostimulation usage are shown, where and in what problems it is used. Because this work deals with an external generator for a trial period (a trial system), the possibilities of testing electric impulses are described, which are then used in a implantable generator IPG. The requirements for such a external generator are also described, which are important for the design of such a device. The design of the device is firstly modeled by a block scheme, where function of the separate blocks is described and afterwards, the entire design of the external generator for neuromodulation is given. The test sample of the external generator is manufactured and tested.

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