Contamination preventive cap

#This invention relates to an antipollution cap mounted on a medical eyedrops container (hereinafter simply called “eyedrops container”) for containing medical eyedrops for instillation.

#Examples of existing eyedropper, especially those for applying a medical fluid such as medical eyedrops, which are in wide use, are what is called a three-piece type eyedropper including a main container body in the form of a hollow cylinder, with an instilling tube attached thereto, and with a cap mounted on the main container body to make three components forming a whole eyedropper, and, as shown in FIG. 11, what is called a bottle pack eyedropper X which may be an integral molding type container A, with an instilling tube 6 and a main container body 10 formed integrally by blow molding or vacuum forming technique, and with a cap B screwed or fitted to the container A. It is also known that the instilling tube 6 has a stopper with an instilling opening 6a mounted on a tip end of the tube (see FIGS. 1 and 2 of Japanese Utility Model Publication No. 39-11991). As a material of the eyedropper X of this type, a soft thermoplastic resin is used because it is easy to form and so on.

#When the medical fluid contained in the eyedrops container A is applied with this type of eyedropper X, a barrel 2 of the eyedrops container A (main container body 10) is held by tips of two digits to keep an applying posture where the instilling opening 6a of the eyedrops container A faces the eye to receive the fluid. The barrel 2 is pressed toward an axis of the container while maintaining the applying posture, whereby the medical fluid is distilled and applied from the instilling opening 6a.

#FIG. 1 is a schematic view showing a state in which a cap and a main container body according to the present invention are screwed together;

#FIG. 2 is a schematic view showing states a shift from a non-pressed position to a pressed position, in which (a) is a schematic view showing the state in the non-pressed position (where a cutoff portion is removed from an overcap), while (b) is a schematic view showing the state in the pressed position (where a cap body is placed in contact with a base member);

#FIG. 3 is a schematic view of principal portions in a state where a medical fluid drips in time of instillation;

#Embodiments of the present invention will be described hereinafter with reference to the accompanying drawings. In the drawings, the parts shown with like numerals or symbols as in the prior art example indicate like or corresponding parts.

#FIGS. 1 through 5 show schematic views of an eyedropper X mainly used for medical application and of principal portions of each component constituting the eyedropper X, respectively. This eyedropper X comprises an eyedrops container A including a main container body 10 capable of containing mainly a medical fluid such as medical eyedrops as a fluid, and a cap B detachably mounted on the eyedrops container A.

#As the eyedrops container A, a container with an instilling tube mounted on the main container body in the form of a hollow cylinder, or an integral molding type eyedrops container A with the instilling tube and the main container body formed integrally by blow molding or vacuum forming technique are in wide use.