Atualização de sistema duplicador de pulsos para teste de proteses de valvulas cardiacas / Upgrade of a pulse duplicator system for cardiac valve prostheses evaluation

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

It has become very frequent the use of mechanic or biological cardiac valve prostheses. These prostheses must be evaluated (in vitro and in vivo tests) in order to be used clinically. The hydrodynamic performance tests are carried out in vitro. The analyses of the test results are very important for the characterizations and classification of a given prosthesis, being one of mandatory requirements of the regulatory organs in order to approve its clinical use. The hydrodynamic performance tests are carried out by complex systems often called pulse duplicators, which must reproduce the heart hydrodynamic behaviour and simulate the physiological variables that the cardiac valves are submitted in real conditions. In this work it has been developed a software program to be used at Braile Biomedica based on the LabVIEW® platform, capable of acquiring and processing flux and pressure signals from specific transducers, as well as all the necessary calculi and generation of the test results report. It has also been developed the signal conditioning circuits for the pressure and flux transducers inherent to the company pulse duplicator. The following parameters are calculated and reported with several graphics showing flux and pressure signals: orifice specific area, discharge coefficient, regurgitation fraction and valve performance and efficiency indices

ASSUNTO(S)

coração - valvulas cardiac valve valvulas cardiacas artificiais hydrodynamic evaluation biomedical engineering modulação (eletronica) flow and pressure transducers engenharia biomedica pulse duplicator

Documentos Relacionados