Double-channel working cannula

Abstract

The invention discloses a double-channel working cannula. The double-channel working cannula comprises a cannula body, an interlayer and a handle; the cannula body is of a hollow tubular structure; aninlet and an outlet are respectively formed in the two ends of the cannula body; the outer diameter of the cannula body is gradually reduced from the end, close to the inlet, of the cannula body to the end, close to the outlet, of the cannula body; the interlayer is arranged in the cannula body in the length direction of the cannula body; the handle is fixedly installed at the end, close to the inlet, of the cannula body; the interior of the cannula body is divided into a working channel and an endoscope channel through the interlayer; the working channel is arranged above the endoscope channel; the working channel is used for containing surgical instruments; and the endoscope channel is used for containing an intervertebral foramen endoscope. According to the application of the double-channel working cannula in the invention, extra damage to a patient in the placing process is reduced; the safety is improved; whole-course visual penetration of an interbody fusion cage is realized; the operation is relatively simple, convenient and flexible; the operation difficulty is reduced; the unnecessary use of an expandable vertebral body fusion cage is reduced; and the success rate of thespinal operation is improved.

Description

technical field [0001] The invention relates to the technical field of medical instruments, in particular to a dual-channel working sleeve. Background technique [0002] As the concept of minimally invasive spinal surgery continues to gain popularity, more and more spine surgeons currently regard minimally invasive surgery as their preferred treatment strategy. Intervertebral fusion plays an important role in the reconstruction of spinal stability, and the key to intervertebral fusion is the placement of intervertebral fusion cages. Any size fusion cage can be placed due to the open surgery with sufficient operative field. However, for minimally invasive surgery, due to the limited field of view, the operator can only place the channel matching the fusion device or use an expandable fusion device. For larger fusion devices, placing a larger channel will increase tissue, The risk of nerve injury; for the expandable fusion cage, due to material problems, the elastic modulus ...

AI Technical Summary

Problems solved by technology

However, for minimally invasive surgery, due to the limited field of view, the operator can only place the channel matching the fusion device or use an expandable fusion device. For larger fusion devices, placing a larger channel will increase tissue, Risk of nerve injury; for expandable fusion cages, due to material problems, there is a large difference in elastic modulus from bone, which can easily lead to endplate damage, collapse, and non-fusion of bone grafts, resulting in surgical failure

At the same time, in the process of placing the fusion cage in endoscope-assisted intervertebral fusion, it is not yet possible to achieve full visualization, especially when the fusion cage is finally inserted, the endoscope is withdrawn and replaced with a larger diameter channel, and only rely on X-ray, operating under blind sight by hand, increases the risk of nerve damage

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