Needle assemblies are generally discussed herein with particular discussions extended to needle assemblies having a tip protector with a plurality of wall surfaces for preventing contact with the needle tip from a side. Aspects of the tip protectors discussed herein include a first protector body having an arm for blocking a needle tip surrounded by a second protector body having a plurality of wall surfaces.在此所討論的係注射針組件，討論內容特別延伸至：具有一針頭保護器的注射針組件，該針頭防護器有複數個用於防止該注射針頭接觸側邊之壁面。在此所討論之針頭防護器的觀點包括一個具有一臂狀部分的第一保護器體，其用於阻擋一個由具有複數個壁面之第二防護器體所包圍住的注射針頭。
