MEDICAL ANESTHETIC NEEDLE

摘要

A medical anesthetic needle comprising a straight inner needle (3) whose tip (4) is a pencil point and a straight pipe shaped outer needle (2) through which the inner needle is inserted from its rear. The tip end part (12) of the outer needle (2) has a hollow frustoconical shape or a similar shape and its minimum inner diameter (D1) is smaller than the outer diameter of the main part (5) of the inner needle (3). When the inner needle (3) is inserted into the outer needle (2), the circumferential edge of the tip end part (12) of the outer needle (2) is made to touch the circumference of the tip (4) or the main part (5) of the inner needle (3), producing no gap between those parts. Consequently the nerve texture of a patient can be protected from being caught between the inner needle and the outer needle and the patient does not suffer pain caused by the catch of the nerve texture.