FIGURE 2.

The internal volume of the left ventricle was cast using room-temperature vulcanizing silicone. Chavant clay was used with attached tubing to form the core for the reverse molding of the RTV silicone. The silicone outer mold was then used to rapidly produce multiple cores made of paraffin wax. Finally, the final chamber model was produced by pouring Platsil Gel 10 silicone into the interstitial space between the larger mold and the wax core.