Patent ID: 8894622

Claim:
A bottle for dispensing a preservative-free liquid to be dispensed drop by drop comprising a dispensing head and a reservoir with a wall capable of elastic deformation, the deformation being reversible by letting air into said reservoir to replace any volume of liquid expelled by means of said dispensing head through which liquid is delivered under the effect of a pressure exerted against said wall, air being let in through the dispensing head via the same route as the expulsion of liquid, wherein said dispensing head which is fitted in a sealed manner into said bottle comprises a dropper tip which extends outside of said bottle and which is pierced with a central channel leading to an orifice for expulsion of liquid, said dropper tip comprising a body having a base, and a core which is inserted into said central channel, wherein a partially hydrophilic and partially hydrophobic antibacterial filtering membrane, is mounted on the base of said dropper tip, and is interposed across a passage for liquid and air, so as to allow liquid flowing in a dispensing direction from the reservoir to the dropper tip, under the effect of a pressure exerted by a user on said wall to pass through said filtering membrane, and to allow air flowing in a reverse direction from the dropper tip to the reservoir, when said pressure is released after the dispensing of a drop of liquid, to pass through said filtering membrane while preventing the passage of bacteria from outside of said bottle into said reservoir, whereby air passes into the dispensing head via the same route as liquid that is dispensed from said reservoir, wherein selectively said body and said core, which are situated beyond said partially hydrophilic and partially hydrophobic antibacterial filtering membrane in the dispensing direction, are both made of a material containing a bactericidal agent, and wherein said core comprises a plurality of subchannels for the expulsion of liquid and the intake of air in compensation, said subchannels being formed by grooves hollowed out on an external surface of said core.