Threaded sleeve

Abstract

The invention discloses a threaded sleeve, comprising a shell and an inner cavity located in the shell and playing a role of a surgical equipment passage in a minimally invasive surgery. The shell comprises a large-diameter section and a small-diameter section; at least one threaded track is arranged on the outer surface of the small-diameter section; the thread of the threaded track comprises a forward surface and a backward surface; the forward surface and the outer surface of the shell are arranged to form an acute angle; and the backward surface and the outer surface of the shell are arranged to form a right angle or an obtuse angle. The invention has the beneficial effects that: the threaded track with the forward surface as an acute-angle slope and with the backward surface as a right-angle or obtuse-angle plane is adopted to ensure that the sleeve can realize the forward and backward manners, therefore, the sleeve cannot fall off during the surgery and the sleeve can smoothly exit from the tissue after the surgery; and the double-thread or multi-thread track is adopted to ensure that the sleeve can be more quickly screwed in and out after the surgery but is not easy to be pulled away because of the abdominal pressure.

Description

technical field [0001] The invention relates to a trocar, in particular to a threaded sleeve of the trocar. Background technique [0002] A trocar is a surgical instrument that pierces the abdominal wall and provides a passage for other surgical instruments to enter the body cavity, and belongs to a minimally invasive surgical instrument. [0003] A trocar generally includes a sleeve as an access channel for other surgical instruments and a puncture rod penetrating through the sleeve. To penetrate the skin, the epidermis of the skin is first cut with a scalpel, and then the puncture rod penetrates the skin and enters the body cavity. By applying pressure to the proximal end of the lancet, the tip of the lancet is pushed through the skin until it enters the body cavity. The trocar enters the body cavity, the puncture rod is drawn out, and the inner cavity of the sleeve can be used as a minimally invasive instrument channel for performing endoscopic surgery and endoscopic in...

AI Technical Summary

Problems solved by technology

[0004] At present, the outer surface of the cannula of the puncture device is a smooth smooth surface, and a problem often occurs during the operation: that is, when the sleeve is placed in the body cavity, when it is inflated into the body cavity, due to the high pressure in the body cavity, The cannula is often squeezed out of the body cavity, causing the abdominal cavity to be deflated, and the surgical process is imaged

[0005] An improvement in the prior art is that the outer surface of the cannula is provided with parallel anti-slip rings. Although this solves the problem of shedding of the cannula, another problem arises: that is, the cannula needs to be pulled out from the body cavity after the operation is completed. At the same time, the anti-slip ring will play a pulling effect on the tissue, which will tear the tissue around the sleeve and increase the difficulty of wound healing for patients.

Images