2015年1月1日 · Dip casting is technologically one of the simplest methods as it involves dipping a mould into a solution of the polymer, removing the mould and then evaporating the solvent. In practice, repeatability in terms of the desired thicknesses and quality is not trivial.

2024年8月1日 · Here, we present a novel dip-casting approach for creating trileaflet PHV. We describe the preparation of a multi-solvent polyurethane solution that optimises the casting process.

2019年1月1日 · Dip casting or dip coating is a manufacturing method commonly used for silicones and PUs. The technique requires a custom-shaped mandrel, in the shape of valve leaflets, to be dipped into a polymer solution. The desired thickness of the leaflets can be attained through subsequent dips, allowing the solution to air dry in between each.

Polymeric heart valves can best mimic the tissue-level mechanical behavior of the native valves. This review summarizes the evolution of polymeric heart valves and the state-of-the-art approaches to their development, fabrication, and manufacturing.

The polyurethane (PU) component of the blend imparts good mechanical properties to the heart valve, and the polysiliconeurethane (PSU) component of the blend imparts resistance to in vivo...

Dip casting is a unique process in which a mandrel, custom- fabricated for the desired shape, is dipped in silicone elastomer then cured on the mandrel. In this process, even the most complex components and undercuts can be produced flash-free and without parting lines. This custom process can also

Chuck and method to form prostheses of heart valves by immersion coating in a polymer. The invention relates to methods for forming valve prosthesis with polymer sheets coated by Dip a...

2013年1月1日 · This design was used to compare two manufacturing methods, namely thermoforming and dip-casting using IT C34 polyurethane (E = 7–10 MPa; both types 200 μm leaflet thickness) . There was only a small difference in hemodynamic properties, but dip casting proved far superior in terms of durability, with at least 160 mc achieved compared to 100 ...

2009年6月1日 · Several methods of polymeric HV manufacture have been investigated, such as dip casting, film fabrication, injection moulding and cavity moulding (Box 2).

There is considerable interest in polyurethane synthetic leaflet heart valves for both ventricular assist devices and direct implantation in the body. Two different manufacturing methods, thermal forming, and dip casting, of the leaflets have been investigated. There were only small differences in …