Abstract: There is provided a formulation for sanitizing air and reducing malodour in the air. The formulation comprises a malodour absorbing compound, an antimicrobial compound, wherein the antimicrobial compound is chemically incompatible with the malodour absorbing compound when mixed alone together, a solubiliser, and a chelating agent for the malodour absorbing compound, wherein the chelating agent prevents the formation of precipitate or a cloudy solution when the malodour absorbing compound is mixed with the antimicrobial compound in the presence of the solubiliser.

Abstract: A method of preparing an antimicrobial air filter comprising the steps of: soaking a porous material in a silver nanoparticle colloid; and coating the porous material embedded with silver nanoparticles with a silane quaternary ammonium polymer such that the loss of silver nanoparticles is reduced. The resultant filter may be used in an air treatment device.

Abstract: The configuration of the present invention includes a winged shield that has a cylindrical shield tube and wings linked to a front end side of the shield tube, a hub that is inserted into an inner bore of the shield tube so as to be movable in an axial direction, and a cannula that is mounted to a front end portion of the hub. By engaging a protrusion with a third annular groove, the hub is held with the winged shield in a state where the cannula protrudes for a predetermined length from a front end of the shield tube. In a state where an inward annular protrusion of the shield tube is engaged with a first holding portion, a tip of the cannula can be stored in the shield tube. By engaging the protrusion of a holding mechanism with a first annular groove, the hub is held with the shield tube so as not to be moved within the shield tube.