Project, development and testing In vitro of new model pump for cardiopulmonary bypass : spiral pump / Projeto, desenvolvimento e ensaios

Juliana Leme

A model of blood pump has been developed, the Spiral Pump. This pump has an internal rotor, a conically shaped fuse, containing threads with double entrance on its surface. This rotor is supported by two bearings assembled at a stainless steel shaft, fixed to the housing´s base. The rotation of the conical fuse is generated by magnetic coupling to a motor, using two annular magnets with six poles. The main objective of this paper is to describe the development methodology of this new blood pump to be for Cardiopulmonary Bypass, during cardiac surgery. Based on previous studies, six different prototypes were developed and constructed. Hydrodynamic performance tests and hemolysis test were conducted. The hydrodynamic performance tests were made in vitro, using a closed loop circuit where total pressures head, flows and rotational speed were registered. Hydrodynamic performance curves were generated (pressure x flow) in different rotational speeds, for each prototypes. The prototype #6 showed best results and the preliminary hemolysis tests were conducted to determine the Normalized Index of Hemolysis (NIH), calculate through Plasma Free Hemoglobin (ASTM F1841 and F1830). NIH results were satisfactory for this application, NIH = 0,0118927 ±0,0061 g/100L, not showing significant different when compared to results from a reference pump (Bio-Pump®, Meditronic). The next step is to produce pumps made by polycarbonate injection to be able perform new hemolysis tests, in vivo tests and, subsequently, clinical evaluation

Project, development and testing In vitro of new model pump for cardiopulmonary bypass : spiral pump / Projeto, desenvolvimento e ensaios "In Vitro" de novo modelo de bomba de sangue para circulação extracorpórea : bomba espiral

AUTOR(ES)

FONTE

DATA DE PUBLICAÇÃO

RESUMO

ASSUNTO(S)

ACESSO AO ARTIGO

Documentos Relacionados