In a thesis titled "An Implantable Device for Electrical Nerve Stimulation" from the Norwegian University of Science and Technology, Lars Lye Moen designed a prototype for an implantable electrical nerve stimulator with the ability to be miniaturized into 1/4 of the size of similar stimulating systems. This was designed primarily for use in VNS applications (Vagus Nerve Stimulation). In this thesis, EP21LVMed is cited as follows: “The EP21LVMed two part epoxy was tested for a solution where the epoxy encapsulated the device, but leaves a section for insertion of the battery.”1
1 Moen, Lars Lyse. Norwegian University of Science and Technology, Department of Engineering Cybernetics. "An Implantable Device for Electrical Nerve Stimulation." July 2014.