 In the last decades, the Helfrich model has been extensively used in computer simulations of vesicles, red blood cells and related systems.From a numerical point-of-view bending forces stemming from the Helfrich model are very difficult to compute as they require the numerical evaluation of fourth-order derivatives and, accordingly, a large variety of numerical methods have been proposed for this task.The opening-up process of lipid bilayers by talin was observed by Saitoh et al.