A book retention device comprises a sleeve for accommodating a book with a binder hole extending therethrough. An operation of outputting two no-jetting drive pulses in one cycle is repeated for 100 to 150, and then stopped for 100 to 150 cycles. The electrode also includes a plurality of upper active edges for ablating tissue in an electrosurgical procedure. Flow-throttling openings present in the partition are positioned to comply with the location and shape of the heating resistances.