Cannula assembly provided with air bag and used for direct puncture

Abstract

The invention relates to a cannula assembly provided with an air bag and used for direct puncture. The cannula assembly comprises a first sealing assembly and a second sealing assembly, the second sealing assembly comprises a lower shell and a hollow cannula which is connected with the lower shell and extends to the far end, the first sealing assembly, the second sealing assembly and the hollow cannula comprise instrument channels which are communicated and generally aligned, and the hollow cannula comprises an inner column surface, an outer column surface and a cannula wall between the inner column surface and the outer column surface; the far end of the hollow cannula further comprises an open cannula lip, the cannula lip comprises an inclined column surface between an open lip part and a transition lip part, and the inner column surface and the inclined column surface define a cannula inclined wall; an air bag assembly comprises an air bag axis, an air bag lip and an air bag body connected with the air bag lip, and the air bag lip extends towards the far end to form an air bag inclined wall matched with the cannula inclined wall in shape and size; the air bag lip extends towards the near end to be connected with the air bag body and is in smooth transition; an included angle formed between the air bag plane of the air bag body and the air bag axis is an acute angle.

Description

technical field [0001] The invention relates to a minimally invasive surgical instrument, in particular to a puncture device containing an air bag. Background technique [0002] A trocar is a surgical instrument used in minimally invasive surgery (especially laparoscopic surgery) to establish an artificial channel into a body cavity, and usually consists of a cannula assembly and a puncture needle. Its general clinical use method is: first cut a small opening on the patient's skin, then pass the puncture needle through the cannula assembly, and then penetrate the abdominal wall through the skin opening and enter the body cavity together. Once in the body cavity, the needle is removed, leaving the cannula assembly as a channel for the instrument to enter and exit the body cavity. [0003] In rigid endoscopic surgery, especially laparoscopic surgery, an insufflation machine is usually used to continuously infuse gas (such as carbon dioxide gas) into the patient's abdominal ca...

AI Technical Summary

Problems solved by technology

[0005] The currently disclosed Hasson casing systems are mainly divided into three categories. The first category, such as a casing assembly with a hinge structure disclosed in the US patent US5203773, is fixed by hinge rotation and expansion, and is gradually discarded due to easy leakage. use

The second type, such as the Hassan cannula system composed of the conical fixing part and the smooth sleeve assembly disclosed in U.S. Patent No. US5257973, first the conical part is sutured and fixed in the incision, and the smooth sleeve assembly is fixed on the cone Among the fixed parts, it is widely used because of its low cost, but its operation is relatively complicated and causes secondary harm to patients

But the structure of this type of air bag sleeve assembly is complicated and the cost is high, and the price is expensive

[0006] The balloon sleeve assembly is usually only used in the field of Hasson method, so far, the disclosed and commercialized balloon sleeve assembly basically cannot be used in the direct puncture method

The main reason is that the trocar containing the balloon sleeve assembly has too much resistance in the process of penetrating the patient's body wall, which is not conducive to the control of the surgeon or there is a greater risk of puncturing the patient's internal organs

Compared with the sleeve assembly without the balloon, the balloon sleeve assembly is favored by doctors because of its more reliable fixation on the patient's abdominal wall, but the larger puncture force of the sleeve assembly with the balloon limits the The application of components in the field of direct puncture method, and the disclosed and commercialized balloon sleeve components have not yet properly solved the problem of large puncture force

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