Variable-stiffness protective sheath for natural cavity operation and application method thereof

Abstract

The invention discloses a variable-stiffness protective sheath for a natural cavity operation. The protective sheath comprises a braided tube, the braided tube is formed by spirally winding and intersecting multiple hoses, and the interiors of the hoses are filled with alloy with a low melting point. The invention further provides a method for applying the variable-stiffness protective sheath to the natural cavity operation. The method comprises the steps that the alloy with the low melting point in the hoses is powered on and melted, and the braided tube is in a flexible and small-diameter state; the braided tube is put into a natural cavity; the diameter of the braided tube is increased, the alloy with the low melting point is solidified at the human-body temperature, and the braided tube is in a rigid and large-diameter state; an operation tool is put into the braided tube for the operation; after the operation, the alloy with the low melting point in the hoses is powered on, and the braided tube is restored to be the flexible state and drawn out of the natural cavity. The structural stiffness of the braided tube of the variable-stiffness protective sheath is changed through the adoption of a phase transformation technology of the alloy with the low melting point, it can be ensured that the variable-stiffness protective sheath has a relatively large stiffness changing range, and the human cavities are protected from being scratched and stabbed by the operation tool.

Description

technical field [0001] The invention relates to the field of minimally invasive surgery, in particular to a variable stiffness protective sheath for natural orifice surgery and an application method thereof. Background technique [0002] With the development of science and technology, modern medicine has entered the era of minimally invasive surgery. Among them, natural orifice transluminal endoscopic surgery (NOTES), as the first level of modern surgical mode, has the advantages of mild pain, short hospital stay, and no scar after operation, and has become a research hotspot in modern medicine. The so-called natural orifice operation means that surgical tools enter the inside of the human body through natural orifices (such as esophagus, vagina, navel, etc.) for surgical operations. Since the natural orifice of the human body is curved and narrow, doctors need to use slender surgical tools to complete surgical operations during the operation. Long-distance transmission an...

AI Technical Summary

Problems solved by technology

Since the braided tube structure is composed of helical wires, it has the characteristics of large bending curvature and variable diameter. Therefore, this invention effectively solves the above-mentioned problems of small bending curvature and unchangeable diameter while realizing the function of variable stiffness.

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