PROBLEM TO BE SOLVED: To provide an indwelling needle assembly reducing puncturing pain while maintaining puncturing property as an indwelling needle and improving operability.SOLUTION: The indwelling needle assembly includes: an inner needle 11 having a puncturing portion formed at the distal end an inner needle base 12 to which the rear end portion of the inner needle 11 is secured a hollow cover 19 through which the inner needle 11 is inserted a slide portion 20 to which the rear end of the cover 19 is secured and which is slidably engaged with the inner needle base 12 and a catheter 23 into which the inner needle 11 and the cover 19 are inserted and in which the puncturing portion of the inner needle 11 protrudes outward. A taper portion 24 tapering toward the puncturing portion of the inner needle 11 is arranged at the distal end of the catheter 23. The distal end of the cover 19 is located on the inner side of the distal end of the catheter 23. The puncturing portion of the inner needle 11 protrudes from the distal end of the cover 19 when connecting the inner needle base 12 and the slide portion 20. The puncturing portion of the inner needle 11 is housed in the cover 19 when spacing the inner needle base 12 and the slide portion 20.COPYRIGHT: (C)2013,JPO&INPIT【課題】留置針としての穿刺性能を維持しつつ、穿刺痛を軽減し、操作性を向上させた留置針組立体を提供する。【解決手段】先端に穿刺部が形成された内針11と、内針11の後端部が固定される内針基12と、内針11が挿通される中空のカバー19と、カバー19の後端が固定されると共に、内針基12と摺動自在に係合されるスライド部20と、内針11とカバー19とが挿通され、内針11の穿刺部が外部に突出するカテーテル23とを備え、カテーテル23の先端には内針11の穿刺部に向かって細くなるテーパー部24が設けられ、カバー19の先端はカテーテル23の先端よりも内側にあり、内針基12とスライド部20とを接合したときには内針11の穿刺部がカバー19の先端から突出し、内針基12とスライド部20とを離間したときには内針11の穿刺部がカバー19内に収納される。【選択図】図5
