Defibrillator

A defibrillator comprising a biphasic pulse generation circuit connected to a rear stage side of a high-voltage capacitor, the biphasic pulse generation circuit being of an H-bridge type, wherein:

• the biphasic pulse generation circuit includes
• a first switch,
• a second switch that is connected in parallel to the first switch,
• a third switch that is connected to a rear stage side of the first switch, the third switch being connected in series to the first switch, and
• a fourth switch that is connected to a rear stage side of the second switch, the fourth switch being connected in series to the second switch;
• the biphasic pulse generation circuit outputs a biphasic pulse from a first output line connected to a connection intermediate point between the first switch and the third switch and from a second output line connected to a connection intermediate point between the second switch and the fourth switch;
• at least one of the first switch to the fourth switch has a configuration in which a plurality of insulated gate bipolar transistors (IGBTs) are connected in series;
• a plurality of branch signal lines branched from a common gate signal line from a controller are respectively connected to gates of the plurality of IGBTs;
• and
• a signal delay amount of the branch signal line connected to an IGBT located on a front stage side among the plurality of IGBTs is larger than a signal delay amount of the branch signal line connected to an IGBT located on a rear stage side among the plurality of IGBTs.