Effect of the bileaflet inlet valve angle on the flow of a pediatric ventricular assist device: Experimental analysis

Autor(es)

Harry Diniz Lemos, Bernardo Luiz ; Andreghetto Bortolin, Vitor Augusto ; Amaral, Rodrigo de Lima ; Mazzetto, Marcelo ; Cestari, Idagene Aparecida ; Meneghini, Julio Romano

• Tipo de documento: Artigo Científico
• Fonte: ARTIFICIAL ORGANS; v. N/A, p. 14-pg., 2022-05-15.

Resumo

Background Mechanical heart valves (MHV) and its fluid dynamics inside a pulsatile pediatric ventricular assist device (PVAD) can be associated with blood degradation. In this article, flow structures are analyzed and compared by an experimental investigation on the effect of bileaflet MHV positioned at varying angles in the inlet port orifice of a PVAD. Methods Time-resolved particle image velocimetry was applied to characterize the internal flow of the device. St Jude Medical bileaftlet valves were used on the inlet orifice and positioned at 0 degrees, 15 degrees, 30 degrees, 45 degrees, 60 degrees, and 90 degrees in relation to the centerline of the device. Three planes with bidimensional velocity magnitude fields were considered in the analysis with visualization of diastolic jets, device wall washing patterns and flow circulation during emptying or systole of the pump. Also, the washing vortex area, and vertical velocity probabilities of regurgitant flows in the inlet valve were evaluated. Results The results show that a variation in the angle of the MHV at the inlet port produced distinct velocities, fluid structures, and regurgitant flow probabilities within the device. MHV positioned at an angle of 0 degrees generated the strongest inlet jet, larger vortex area during filling, more prominent outgoing flow, and less regurgitation compared to the angles studied. The presence of unfavorable fluid structures, such as small vortices, and/or sudden flow structure interruption, and/or regurgitation, were identified at 45 degrees and 90 degrees angles. Conclusions The 0 degrees inlet angle had better outcomes than other angles due to its consistency in the multiple parameters analyzed. (AU)

• Processo FAPESP: 20/15230-5 - Centro de Pesquisa e Inovação de Gases de Efeito Estufa - RCG2I
• Beneficiário: Julio Romano Meneghini
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia
• Processo FAPESP: 12/50283-6 - Suporte circulatório em pacientes pediátricos: dispositivo de assistência ventricular e oxigenação extracorpórea
• Beneficiário: Idágene Aparecida Cestari
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 14/50279-4 - Brasil Research Centre for Gas Innovation
• Beneficiário: Julio Romano Meneghini
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia