Combine lumped parameter model to left ventricle finite element

hello everyone. I’M working on model were I coupled the finite element left ventricle to a lumped parameter model of circulatory system. the lumped parameter is governed by a set of ODE and the left ventricle is model by the mechanic equilibrium equation where the boundary condition on the endocardium is coming from the pressure computed previously by ODE. I wrote my program, is it runing effectively but the algorithm doesn’t seem to solve my problem.
can somebody work on this type of problem? can someone helps me please.
here there is a picture of the circulatory system.
lumped
renethierrydjoumessi@yahoo.com