Natural orifice translumenal endoscopic surgery (NOTES) device

A natural orifice translumenal endoscopic surgery (NOTES) system, comprising:

• a puncture needle comprising a puncture end, a protruding safety stud disposed at a position substantially at a middle section of the puncture needle, and a positioning projection on an outer surface wherein the puncture needle is provided for puncturing into an internal wall of a nature lumen at the beginning of a surgical procedure;
• a plurality of dilator sheaths each comprising a plurality of tapered first diameters, an insert member at one end, and a limiting shoulder at the other end, each dilator sheath being sheathed sequentially onto the puncture needle and each dilator sheath further comprising an elongated positioning protrusion on an outer surface and an elongated groove on an inner surface, the groove being disposed correspondingly to the positioning protrusion wherein the positioning projection is complementarily received in the groove when the puncture needle is disposed in the dilator sheath, and the protruding safety stud of the puncture needle is stopped by the limiting shoulder such that such that the insert member is not allowed to pass through the puncture end;
• a plurality of working sheaths each having a plurality of tapered second diameters, and each of the tapered second diameters of the working sheaths being slightly greater than each of the tapered first diameters of the dilator sheaths wherein each of the working sheaths comprises an elongated positioning protuberance on an outer surface and an elongated trough on an inner surface, the trough being disposed correspondingly to the positioning protuberance, the positioning protrusion being complementarily received in the trough when the dilator sheath is disposed in the working sheath, and the working sheath being used for inserting and retracting the dilator sheaths and the puncture needle after the dilator sheaths have expanded a natural orifice;
• and
• a tool member comprising a cylindrical shaft including a graduation on an outer surface, and an operating head threadedly secured to one end of the cylindrical shaft.