Patent ID: 7928339

Claim:
A device for sterilization using a plasma gas by ionisation of a gas, said device comprising: a supply circuit comprised of a voltage step-up supply transformer ( 1 ) having a ratio, an input side for connection to a peak-to-peak supply voltage, and a peak-to-peak output voltage on a secondary winding, the secondary winding having terminals; a microwave source of determined nominal power (P n ), said microwave source connected to the terminals of the secondary winding of the supply circuit, said microwave source comprising a magnetron ( 7 ) receiving power (P d ) delivered from the secondary side of the supply circuit, wherein the power (P d ) delivered by the supply circuit to the magnetron ( 7 ) is no more than one quarter of the nominal power (P n ) of the magnetron ( 7 ) while providing a peak voltage of 3 to 4 kv during start-up of the magnetron; a waveguide ( 8 ) joined to the magnetron; a cavity resonator ( 9 ) jointed to the waveguide ( 8 ); and a medical instrument treatment cavity, the magnetron arranged to ionize gas within the medical instrument treatment cavity.