Drainage device for medical use

Claim 1

A drainage device for use in a body cavity comprising: a puncture needle; a flexible metallic guide wire insertable into said puncture needle; a tube-like dilator having a front end aperture for inserting therein said guide wire when said puncture needle has been withdrawn from said guide wire, said dilator being made of a synthetic resin and bendable, a front portion of said dilator having an outer diameter which gradually reduces toward a tip portion thereof; a fastening jack coupled to a back portion of said dilator; a sheath for covering the outer periphery of the dilator, said sheath having a length shorter than the length of said dilator; a fastening plug attached to a back portion of said sheath for liquid-tightly coupling with said fastening jack of said dilator; a drainage tube for inserting into said sheath, and said drainage tube having a front end aperture for inserting therein said guide wire for covering said guide wire when said fastening jack is detached from said fastening plug for withdrawing said dilator from said sheath, said drainage tube being made of synthetic resin, and said drainage tube having a tip portion which is curled, and a portion other than said curled portion which has wire imbedded therein; and a universal fastening jack removably attached to a back portion of said drainage tube for liquid-tightly coupling with said fastening plug of said sheath.