A cannula drill for eccentrically adjustable bony access in percutaneous endoscopic lumbar discectomy.

Abstract

This invention discloses a sleeving drill for an eccentrically adjustable percutaneous endoscopic discectomy (PED) with a bony passage. It includes a hollow sleeving into which a PED can be inserted. The end of the sleeving extending into the intervertebral foramen has an open tongue with a spiral cutting edge on its periphery. The open tongue has serrations on both sides near its root. The inner channel of the tongue is eccentrically positioned, with the cutting edge located on the thicker side. This invention, upon detecting a deviation in the bony passage, rotates the sleeving, causing the tongue to rotate as well. The spiral cutting edge then continuously corrects the direction, rotating and grinding away bone to allow entry. This effectively solves the problems of bony passage angular deviation and bone hyperplasia. Otherwise, the passage would have to be reconstructed from scratch, which is time-consuming and laborious. Because of the angular deviation in the bony passage, the difficulty of reaching the surgical site with endoscopic instruments is increased, making it difficult to completely remove nerve compression material, thus affecting the success rate of the surgery or increasing the risk of postoperative recurrence.

Description

Technical Field

[0001] This utility model relates to the field of cannula technology, specifically a cannula drill for eccentrically adjustable bony channels in percutaneous endoscopic lumbar discectomy. Background Technology

[0002] Percutaneous endoscopic discectomy (PED) requires establishing a bony channel at the superior articular process of the vertebral body at a predetermined angle to allow the endoscope to enter the spinal canal and perform endoscopic discectomy. Since the dilators used to create this channel are manually operated by the surgeon, deviations in angle are inevitable during the dilation process. The percutaneous endoscope enters the spinal canal through this established bony channel, severely limiting its range of motion and angle of movement. Furthermore, the discectomy must be performed within the confined space of the spinal canal. If the angle of the established bony channel deviates, it becomes difficult for the surgical instruments to adequately decompress the nerve root after entering the spinal canal, thus reducing the success rate of the surgery and significantly increasing the recurrence rate. Even slightly more severe deviations in the bony channel angle can lead to the surgeon being unable to locate the nerve root for an extended period after the endoscope enters the spinal canal, greatly prolonging the surgical time and causing significant patient discomfort; alternatively, the surgeon may locate the compressed nerve root, but the surgical instruments may be able to see the herniated nucleus pulposus and other tissues compressing the nerve root but not reach it.

[0003] Currently, deviations in the bony channel angle are observed. If the deviation is significant, the channel must be reconstructed from the beginning, which is time-consuming and laborious. If the deviation is minor, firstly, it increases the difficulty of fully releasing the nerve root under endoscopic surgery; secondly, it inevitably affects the success rate of the surgery or increases the risk of postoperative recurrence; and thirdly, conventional instruments are difficult to handle lateral recess stenosis and bone hyperplasia due to the angle issue. Therefore, we have innovated by proposing an eccentrically adjustable cannula drill for bony channels in percutaneous endoscopic discectomy. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0005] This utility model discloses a sleeving drill for an eccentrically adjustable percutaneous endoscopic discectomy (PED) with a bony passage. The end of the sleeving that extends into the spinal canal is provided with a tongue. The outer periphery of the tongue is provided with a spirally arranged cutting edge, and the edge of the tongue is provided with edge serrations. The inner channel of the tongue is eccentrically arranged, and the cutting edge is located on the thick-walled side.

[0006] As a preferred embodiment of this utility model, the cutting edge is arranged in a semi-circular shape.

[0007] As a preferred embodiment of this utility model, the outer wall of the sleeve is a smooth mirror surface.

[0008] As a preferred embodiment of this utility model, the edge serrations are provided at both ends of the tongue edge near the root.

[0009] As a preferred embodiment of this utility model, the end of the tongue is a blunt portion.

[0010] As a preferred embodiment of this utility model, the outer end of the sleeve is provided with a functional handle.

[0011] As a preferred embodiment of this invention, the height of the cutting edge is 1-2 mm.

[0012] As a preferred technical solution of this utility model, the cutting edge, edge serrations and tongue are integrally formed.

[0013] As a preferred embodiment of this utility model, the tongue and the sleeve are integrally formed.

[0014] As a preferred technical solution of this utility model, the cannula is hollow and can be inserted into the percutaneous endoscopic discectomy (PED). This allows for convenient observation of the surgical field at the tip of the cannula drill through the PED during surgery, enabling direct visualization and rotational operation, thus maximizing the safety of the operation.

[0015] The beneficial effects of this utility model are:

[0016] When the eccentrically adjusted percutaneous endoscopic discectomy (PED) technique detects a deviation in the bony passage, the trocar enters along its original path. Simultaneously, the PED is placed inside the trocar. By rotating the trocar, the tongue rotates, and the spirally designed cutting edge and the serrated edge of the tongue continuously correct the direction, rotating and grinding the bone. This effectively solves the problem of angular deviation in the bony passage. If the deviation is severe, the passage must be reconstructed from scratch, which is time-consuming and laborious. If the angular deviation is small, it firstly increases the difficulty of operating the surgical instruments under endoscopy, and secondly, it inevitably affects the success rate of the surgery or increases the risk of postoperative recurrence. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of a cannula drill for an eccentrically adjustable percutaneous endoscopic discectomy.

[0019] Figure 2 This is a front view of a cannula drill for an eccentrically adjustable percutaneous endoscopic discectomy.

[0020] Figure 3This is a right view of a cannula drill for an eccentrically adjustable percutaneous endoscopic discectomy, according to this utility model.

[0021] In the diagram: 1. Sleeve; 2. Tongue; 3. Cutting edge; 4. Functional handle; 5. Edge serration. Detailed Implementation

[0022] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0023] Example: Figures 1-3 As shown, this utility model discloses a cannula drill for eccentrically adjustable bony channels in percutaneous endoscopic lumbar discectomy (PELD). The cannula includes a cannula 1 with a tongue 2 extending into the spinal canal. The tongue 2 has a spirally arranged cutting edge 3 around its periphery, and edge serrations 5 near the root of the tongue 2's edges. The inner channel of the tongue 2 is eccentrically positioned, and the cutting edge 3 is located on the thicker side. When a deviation in the bony channel is detected, rotating the cannula 1 causes the tongue 2 to rotate, thereby using the spirally arranged cutting edge 3 and edge serrations 5 to continuously correct the direction and grind away bone. This effectively solves the problems of angular deviation in the bony channel and the difficulty in treating lateral recess stenosis. In severe cases, the channel must be reconstructed from scratch, which is time-consuming and laborious. Even a small angular deviation increases the difficulty of operating surgical instruments under endoscopy and may affect the success rate of the surgery or increase the risk of postoperative recurrence.

[0024] The cutting edge 3 is arranged in a semi-circular shape, with a length of 22.5 mm and a height of 1-2 mm, and is arranged in a clockwise circular shape.

[0025] The outer wall of the cannula 1 is a smooth mirror surface, which will not cause damage to human tissue. The diameter of the cannula 1 is 7.5mm-8.5mm. The cannula 1 is hollow and can be inserted into the percutaneous endoscopic discectomy unit. The diameter of the cannula 1 is consistent with the diameter of several existing conventional percutaneous endoscopic discectomy unit working cannulas. Therefore, this new type of cannula drill can also be used as a temporary replacement for conventional percutaneous endoscopic discectomy unit working cannulas.

[0026] The end of the tongue 2 is blunt, making it less likely to cause damage to human tissue.

[0027] The outer end of the sleeve 1 is provided with a functional handle 4 for easy operation.

[0028] The cutting edge 3, the edge serrations 5 and the tongue 2 are integrally formed, and the tongue 2 and the sleeve 1 are integrally formed. The connection strength and the torque it can withstand meet the usage requirements.

[0029] Working principle: After a deviation of the bony channel is detected, the cannula 1 is rotated, which in turn drives the tongue 2 to rotate. The spiral cutting edge 3 and the edge serrations 5 are then used to continuously correct the direction and grind the bone to enter. This effectively solves the problem of deviation of the bony channel angle. If the deviation is serious, the channel can only be reconstructed from scratch, which is time-consuming and laborious. If the angle deviation is small, it firstly increases the difficulty of operating the endoscopic surgical instruments, and secondly, it inevitably affects the success rate of the surgery or increases the risk of postoperative recurrence.

[0030] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cannula drill for eccentrically adjustable percutaneous endoscopic discectomy (PED) with bony access, characterized in that: Includes a sleeve (1), the end of the sleeve (1) extending into the spinal canal is provided with a tongue (2), the outer periphery of the tongue (2) is provided with a spirally arranged cutting edge (3), the edge of the tongue (2) is provided with edge serrations (5), the inner tube of the tongue (2) is eccentrically arranged, and the cutting edge (3) is located on the thick wall side.

2. The eccentrically adjustable cannula drill for the bony passage in percutaneous endoscopic lumbar discectomy according to claim 1, characterized in that, The cutting edge (3) is arranged in a semi-circular shape.

3. The eccentrically adjustable cannula drill for the bony passage in percutaneous endoscopic lumbar discectomy according to claim 1, characterized in that, The edge serrations (5) are located at both ends of the edge of the tongue (2) near the root.

4. The eccentrically adjustable cannula drill for the bony passage in percutaneous endoscopic lumbar discectomy according to claim 1, characterized in that, The outer wall of the sleeve (1) is a smooth mirror surface.

5. The eccentrically adjustable cannula drill for the bony passage in percutaneous endoscopic lumbar discectomy according to claim 1, characterized in that, The end of the tongue (2) is blunt.

6. The eccentrically adjustable cannula drill for the bony passage in percutaneous endoscopic lumbar discectomy according to claim 1, characterized in that, The outer end of the sleeve (1) is provided with a functional handle (4).

7. The eccentrically adjustable cannula drill for the bony passage in percutaneous endoscopic lumbar discectomy according to claim 1, characterized in that, The height of the cutting edge (3) is 1-2 mm.

8. The eccentrically adjustable cannula drill for the bony passage in percutaneous endoscopic lumbar discectomy according to claim 1, characterized in that, The cutting edge (3), edge serrations (5), and tongue (2) are integrally formed.

9. The eccentrically adjustable cannula drill for the bony passage in percutaneous endoscopic lumbar discectomy according to claim 1, characterized in that, The tongue (2) and the sleeve (1) are integrally formed.

10. The eccentrically adjustable cannula drill for the bony passage in percutaneous endoscopic lumbar discectomy according to claim 1, characterized in that, The cannula (1) is hollow and can be inserted into the percutaneous endoscopic discectomy.

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