Device for graphic visualization of pressure course in the opening of sphincter of oesophagus mouth in patients after total laryngectomy Application of Innovative Hydroxyapatite Materials in 3D Printing for Biocompatible Voice Implants Revista de Chemie Application of Innovative Hydroxyapatite Materials in 3D Printing for Biocompatible Voice rehabilitation with the application of massage device “Medical 2VR” in patients after total laryngectomy