Dilator

A dilator for a teat of a female mammal, said teat having a duct in communication with the end of the teat comprising:

• a tubular body having a passage adapted to be located in communication with said duct, finger means secured to said body adapted to be inserted into said duct from the end of the teat, each of said finger means having first and second sections outwardly directed and angularly disposed relative to each other, said sections biasing said finger means in outward directions, and one-way valve means mounted on said body for controlling the flow of fluid through said passage, said one-way valve means having a mouth and flexible lip means holding the mouth closed to restrict the movement of material located externally of the teat into the passage and duct.

A dilator for a teat of a female mammal, said teat having a longitudinal duct and a duct outlet in the end of a teat comprising:

• a tubular body having a longitudinal passage, said body being adapted to be positioned in the outlet duct to allow the flow of fluid through the longitudinal passage, an elongated tubular member secured to said body adapted to be located in said duct when the body is positioned in said duct outlet, said tubular member having a longitudinal passage in communication with the passage of the body allowing fluid to flow through the tubular member and body, and a plurality of openings open to the passage in the tubular member allowing fluid to flow through said openings from the duct into the longitudinal passage of the tubular member, and one-way valve means mounted on said body for allowing fluid to flow through said passage of the body and discharge the fluid externally of the teat, said valve means having a plurality of flexible side walls extended away from the body and surrounding a valve chamber open to the passage of the body, each of said side walls having flexible lip means having cooperating edges surrounding a normally closed slit mouth to restrict movement of material located externally of the teat into the duct.

A dilator for the teat of a female mammal, said teat having a longitudinal duct and a duct outlet in the end of the teat comprising:

• means adapted to be inserted through the duct opening into the duct of the teat for facilitating the flow of fluid out of the duct, said means including silver means for providing a silver ion discharge having anti-bacterial action in the teat, said means including a body having a passage adapted to be located in the duct opening, and means attached to the body adapted to be located in said duct, said silver means being associated with said body, and one-way valve means secured to said body for allowing fluid to flow through the passage of the body externally of the teat, said one-way valve means having at least a pair of flexible side walls surrounding a valve chamber open to said passage of the body, said side walls projecting from the body and extended toward each other, each of said side walls having a flexible lip, said lip of the side walls having cooperating edges surrounding a normally closed slit mouth to restrict entrance of movement of foreign substances into the duct of said teat.