Internal fistula remaining needle for hemodialysis

The utility model discloses an internal fistula remaining needle for hemodialysis. The tail end of a trocar is detachably connected with a first heparin cap; the first flow stopping clip is connected to the trocar and can control the on-off of the trocar; the guide needle is connected into the trocar in a pluggable mode, the tip end of the guide needle can extend out of the trocar through an opening in the head end of the trocar, and meanwhile the tail end of the guide needle is left out of the trocar. One port of the extension hose is integrally connected with the side wall of the trocar and communicated with an inner cavity of the trocar, meanwhile, the other port of the extension hose is detachably connected with a second heparin cap, and the first flow stopping clip is located between the communication position of the extension hose and the trocar and the second heparin cap; and the second flow stopping clamp is connected to the extension hose and can control the on-off of the extension hose. According to