| 摘要 |
A needle assembly equipped with a valve (15) comprising an outer needle member having an outer needle hub (12) fixed to the proximal end of an outer needle (10) and a valve (15) mounted to close the inner passage (11) of the outer needle hub (12), and an inner needle member having an inner needle (13) which is adapted to be inserted into the outer needle (10) through the outer needle hub (12) to such an extent that only the tip portion (13a) of the inner needle (13) projects outward through the tip of the outer needle (10). The outer needle hub (12) includes an enlarged hollow portion formed at a portion thereof which is located inner side of the valve-mounting portion, the inner diameter of the enlarged hollow portion being larger by at least twice a compressed thickness of the valve as it is pressed by the attachment of the rod-like member or the tubular member than that of an inner diameter of a portion of the outer needle hub (12) which is located outer side of the valve-mounting portion and in which the rod-like member or the tubular member is fitted, the enlarged hollow portion presenting an relief for a deformed portion of the valve (15) when the rod-like member (16) or the tubular member is inserted through the valve (15). |
