  To find candidates for long-lived high-K isomers in even-even Z=106-112
superheavy nuclei we study dominant alpha-decay channel of two- and
four-quasi-particle configurations at a low excitation. Energies are calculated
within the microscopic - macroscopic approach with the deformed Woods-Saxon
potential. Configurations are fixed by a standard blocking procedure and their
energy found by a subsequent minimization over deformations. Different
excitation energies of a high-K configuration in parent and daughter nucleus
seem particularly important for a hindrance of the alpha-decay. A strong
hindrance is found for some four-quasi-particle states, particularly $K^{\pi} =
20^{+}$ and/or $19^{+}$ states in $^{264-270}$Ds. Contrary to what was
suggested in experimental papers, it is rather a proton configuration that
leads to this strong hindrance. If not shortened by the electromagnetic decay,
alpha half-lives of $\sim$ 1 s could open new possibilities for studies of
chemical/atomic properties of related elements.
