[Problems] In a trocar catheters, allowing the application of the patients pain is less flexible indwelling catheters, and provides a trocar which reduces the risk of organ damage caused by the procedure. The A trocar, and rigid in the core with a sharp tip shape, the inner core is extrapolated freely inserted into, and a combination of the sheath pipe rigid to be inserted into the indwelling catheter freely inserted The ones to be formed, and these the core and sheath pipe, and each of the base end is locked removably engaged with each other, the further the length of these inner core and the sheath tube, is formed by combining these When incorporating Kanhari the indwelling catheter at a location pop-out a predetermined length from the tip of the distal end sharp part indwelling catheter of this inner core, the distal end of the sheath pipe is formed on the tip end inner side of the indwelling catheter stage the shoulder portion of the attached small diameter portion is characterized in that it is configured to abut. .BACKGROUND【課題】套管針付きカテーテルで、患者の苦痛が少ない柔軟な留置カテーテルの適用を可能にし、手技にともなう臓器損傷のリスクを低減する套管針を提供する。【解決手段】套管針を、鋭利な先端形状を有する剛い内芯と、この内芯に挿通自在に外挿され、かつ留置カテーテルに挿通自在に内挿される硬質の鞘管とを組み合わせて形成するもので、これら内芯と鞘管とは、それぞれの基端部が互いに着脱自在に係止されており、さらにこれら内芯と鞘管の長さは、これらを組み合わせて形成される套管針を留置カテーテルに組み込んだ際に、この内芯の先端鋭利部が留置カテーテルの先端より所定長だけ飛び出した位置において、この鞘管の先端がこの留置カテーテルの先端部内側に形成された段付き細径部の肩部に当接するように設定されることを特徴とする。【選択図】図1
