Neointima-inducing inflow cannula with titanium mesh for left ventricular assist device

Area of Science:

• Biomedical Engineering
• Cardiovascular Research
• Medical Device Development

Background:

• Wedge thrombus formation is a significant complication in left ventricular assist devices (LVADs).
• Current inflow cannula designs are susceptible to thrombus accumulation.
• Preventing thrombus is critical for LVAD safety and efficacy.

Purpose of the Study:

• To develop and evaluate a novel titanium mesh-wrapped inflow cannula for LVADs.
• To assess the cannula's ability to induce autologous neointima formation.
• To determine if this design prevents wedge thrombus formation.

Main Methods:

• A titanium mesh-wrapped inflow cannula was designed and implanted in four calves.
• The calves were supported by an EVAHEART centrifugal pump LVAD for approximately 2 months.
• Histological analysis was performed to examine tissue ingrowth and thrombus presence.

Main Results:

• The titanium mesh was successfully enveloped by autologous neointimal tissue.
• No thrombus formation was observed in the blood pumps or around the inflow cannulas.
• Histology confirmed neointimal tissue composed of endothelial cells and fibroblasts.

Conclusions:

• The novel titanium mesh inflow cannula effectively induces autologous neointima.
• This design successfully prevents wedge thrombus formation in LVADs.
• The findings support the clinical potential of this innovative LVAD component.