Patent ID: 6988981

Claim:
A protective tool for a therapeutic material delivery device comprising an outer needle having an outer tubular needle and an outer needle hub supporting the outer tubular needle, the protective tool being configured to be attached to said outer needle for the protection thereof, the protective tool comprising a cover and a cap or stopper attached to a forward end of said cover for protecting the forward end of the outer tubular needle, wherein said cover is formed of a plurality of tubes having different diameters that are formed so as to consecutively decrease from a forward place to the outer needle hub in a backward place, and said tubes are thereby connected such that the cover is extendable in the longitudinal direction, wherein said cap has an inner tube formed inside, said inner tube has, made in a bottom thereof, a hole for inserting and passing said outer tubular needle, and said inner tube has, formed in an outer circumference, a groove portion for inserting a forward end of said outer tubular needle.