A tissue sealant for use in surgical and medical procedures for sealing the tissues of a living mammal is provided. Preferably, the carbonized material has a density of at least about 1. The spin filter layer is disposed to be adjacent to the magnetization free layer and has a thickness in a range of 5 nm to 20 nm. The ring foil is provided adjacent to a cathode, and extends from a position between an outer end of the electrolyte electrode assembly to a position between the annular member and the separator.