Concepção de bancada e montagem de experimento para a análise in vitro de próteses cardíacas mitrais

Bazan, Ovandir; Ortiz, Jayme Pinto

doi:10.1590/s0102-76382011000200009

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…Pode-se esperar que as biopróteses porcinas durem 15 anos na posição aórtica e até 10 anos na posição mitral; também por isto é recomendada para pacientes idosos e para os que não podem receber anticoagulantes. Há vantagens e desvantagens na utilização de próteses biológicas ou mecânicas e ambas devem estar disponibilizadas ao paciente (BAZAN, 2011).…”

Section: Válvulas Cardíacasunclassified

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Cirurgia Cardíaca: Válvula mecânica ou válvula biológica

Dametto,

Souza,

Brum

et al. 2023

DOMO

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O objetivo deste trabalho é comparar o melhor tipo de prótese valvular cardíaca usada para reparar as patologias valvulares, que são doenças cardíacas que pertencem ao grupo composto pelos maiores problemas de saúde pública à nível mundial, aumentando assim o coeficiente de mortalidade. O coração é um órgão muscular que envia sangue para todo nosso corpo e as válvulas cardíacas são a chave para o bom funcionamento dele impedindo que o sangue retorne. Às vezes a utilização de procedimentos terapêuticos não invasivos que proporcionará a restauração funcional das válvulas cardíacas, sendo assim os cardiologistas e engenheiros se uniram para encontrar a melhor solução para confecção de válvulas melhores e mais inovadoras diminuindo os danos colaterais para proporcionar melhor qualidade de vida. As válvulas podem ser mecânicas ou biológicas, elas apresentam vantagens e desvantagens, seja por sua constituição como a mecânica, que requer o uso de anticoagulantes, ou por sua durabilidade como a biológica, que aumenta a incidência de reoperação.

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Section: Válvulas Cardíacasunclassified

“…em 4 de fevereiro de 2010). Além disso, os portadores de válvulas mecânicas necessitam continuamente medicação anticoagulante, que custa ao paciente cerca de R$ 250,00 a R$ 450,00 ao ano, sem contar as despesas médicas de seguimento(BAZAN, 2011).…”

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Cirurgia Cardíaca: Válvula mecânica ou válvula biológica

Dametto,

Souza,

Brum

et al. 2023

DOMO

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Active Pneumatic Pulsation Damper for Peristaltic Pump Flow Loops

Liermann

2016

BATH/ASME 2016 Symposium on Fluid Power and Motion Control

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A novel concept of an active pulsation damper is described that cancels parasitic flow pulsatility of peristaltic pumps and is able to inject desired pulsatility signatures such as physiological heart beat. Peristaltic pumps avoid contact between the moving parts of a pump and the operating fluid. They are used for clean or sterile fluids as well as for highly aggressive fluids, whenever it is important to isolate the fluid from the environment. The background application for the proposed active pulsation damper is the simulation of hemodynamic flow. The paper presents a novel pulse damper concept that allows the use of roller or peristaltic pumps as primary pumps for hemodynamic flow loops. The problem with peristaltic pumps is that they exhibit a high parasitic pulsatility that needs to be canceled before a desired pulsatility can be injected. The active pulsation damper does this and is also used to superpose a desired flow pattern that resembles measured heart flow rate profiles. The nonlinear dynamic equations of a test system with active pulsation dampers are established and linearized to allow a first analysis of the achievable bandwidth. Simulation results of the closed loop system are presented based on the non-linear equations.

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Laser Doppler anemometry measurements of steady flow through two bi-leaflet prosthetic heart valves

Bazan¹,

Ortiz²,

Junior³

et al. 2013

Revista Brasileira De Cirurgia Cardiovascular

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IntroductionIn vitro hydrodynamic characterization of prosthetic heart valves provides important information regarding their operation, especially if performed by noninvasive techniques of anemometry. Once velocity profiles for each valve are provided, it is possible to compare them in terms of hydrodynamic performance. In this first experimental study using laser doppler anemometry with mechanical valves, the simulations were performed at a steady flow workbench.Objective To compare unidimensional velocity profiles at the central plane of two bi-leaflet aortic prosthesis from St. Jude (AGN 21 - 751 and 21 AJ - 501 models) exposed to a steady flow regime, on four distinct sections, three downstream and one upstream. MethodsTo provide similar conditions for the flow through each prosthesis by a steady flow workbench (water, flow rate of 17L/min. ) and, for the same sections and sweeps, to obtain the velocity profiles of each heart valve by unidimensional measurements. ResultsIt was found that higher velocities correspond to the prosthesis with smaller inner diameter and instabilities of flow are larger as the section of interest is closer to the valve. Regions of recirculation, stagnation of flow, low pressure, and flow peak velocities were also found. Conclusions Considering the hydrodynamic aspect and for every section measured, it could be concluded that the prosthesis model AGN 21 - 751 (RegentTM) is superior to the 21 AJ - 501 model (Master Series). Based on the results, future studies can choose to focus on specific regions of the these valves.

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Concepção de bancada e montagem de experimento para a análise in vitro de próteses cardíacas mitrais

Cited by 4 publications

References 22 publications

Cirurgia Cardíaca: Válvula mecânica ou válvula biológica

Cirurgia Cardíaca: Válvula mecânica ou válvula biológica

Active Pneumatic Pulsation Damper for Peristaltic Pump Flow Loops

Laser Doppler anemometry measurements of steady flow through two bi-leaflet prosthetic heart valves

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