A bone channel positioning guide for lumbar spine minimally invasive surgery

Abstract

The application discloses a bone channel positioning guider for lumbar vertebra minimally invasive surgery and relates to the technical field of medical devices, which comprises a fitting ring body, the inside of which is hollow and used for fitting on the skin surface of a patient; an anchoring ring body which can be detachably installed on the fitting ring body; a base plate which is fixedly installed on the annular outer wall of the anchoring ring body; an anchoring sleeve which is movably penetrated through the base plate and used for being temporarily fixed on the bony surface of a target vertebra, the outer wall of the end of the anchoring sleeve close to the target vertebra being provided with anti-sliding microstructures; a through hole which is formed in the anchoring sleeve; and an anchoring drill needle which is fixed on the bony surface of the target vertebra at one end and penetrates through the through hole. The bone surface is stably fixed by the anchoring sleeve and the anchoring drill needle, and the multi-angle adjustment of the guiding sleeve is realized by cooperating with an adjustable guiding and positioning assembly, so that the drill tool is effectively prevented from slipping, and the precision of channel establishment and the safety of surgery are improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a bony channel positioning guide for minimally invasive lumbar spine surgery. Background Technology

[0002] Currently, in minimally invasive lumbar spine surgeries (such as percutaneous endoscopic discectomy), accurately establishing a bony working channel from the skin through the intervertebral foramen to the spinal canal is a crucial step for surgical success. The commonly used positioning and guiding method in existing techniques is the "gradual expansion method." Under X-ray fluoroscopy guidance, the surgeon first positions a thin, long puncture needle on the bony surface of the target vertebra (such as the facet joint). Subsequently, expansion cannulas of increasing diameter are sequentially inserted, with the working cannula finally being placed. Some advanced guiding instruments, such as "tressor guides" or "bone drill guide sleeves," provide a hollow guiding structure, through which the surgeon inserts a tressor or hollow drill to grind or remove the facet joint at a predetermined angle, thereby establishing the channel.

[0003] However, in actual surgical procedures, existing guides present a real and challenging problem: the drill (trephine / bone drill) is prone to "slipping" or "drifting" on bony surfaces. Specifically, when the surgeon inserts the trephine or bone drill through the guide sleeve and contacts the curved or smooth bone surface of the facet joint, the rotating drill tip can radially slip due to the lack of a stable initial contact point, deviating from the pre-set puncture target. This slippage not only causes deviations from the pre-planned bone tunnel entry point, potentially requiring repeated punctures and increasing patient trauma and X-ray radiation exposure; more dangerously, the slipping drill may instantly slip into the spinal canal or nerve root exit point, causing dural sac tears or nerve root damage—one of the most serious complications of percutaneous endoscopic lumbar discectomy (PELD). Summary of the Invention

[0004] The purpose of this invention is to provide a bony channel positioning guide for minimally invasive lumbar spine surgery, so as to solve the problem that the existing minimally invasive lumbar spine surgery guide is prone to slippage and positioning drift when the drill contacts the bone surface.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a bony channel positioning guide for minimally invasive lumbar spine surgery, comprising a fitting ring body, the interior of which is hollow for fitting onto the patient's skin surface;

[0006] An anchoring ring body, which can be detachably installed on the fitting ring body;

[0007] The substrate is fixedly installed on the annular outer wall of the anchoring ring.

[0008] An anchoring sleeve, which moves through the base plate, is used to temporarily fix it to the bony surface of the target vertebral body. The outer wall of the end of the anchoring sleeve near the target vertebral body is provided with anti-slip microstructures.

[0009] A through hole is formed on the anchoring sleeve;

[0010] An anchoring drill bit, one end of which passes through the through hole and is fixed to the bony surface of the target vertebral body;

[0011] A guide sleeve, which moves through the interior of the fitting ring, has a hollow channel for guiding a bone drill or trestle.

[0012] An adjustable guide positioning component is disposed between the guide sleeve and the fitting ring body, and is used to adjust the angle of the guide sleeve.

[0013] Furthermore, the fitting ring has an elastic layer on the side closest to the human body, and the elastic layer has an adhesive layer on the side closest to the human body. The outer ring wall of the fitting ring forms a concave annular groove, and the anchoring ring is movably engaged in the annular groove.

[0014] Furthermore, the annular groove of the fitting ring body has annularly distributed threaded holes, the axis of the threaded holes is perpendicular to the central axis of the fitting ring body, and the center of the threaded holes and the center of the fitting ring body are located in the same vertical plane. The anchoring ring body is provided with a locking member, and the threaded part of the locking member cooperates with the threaded holes.

[0015] Furthermore, the substrates are distributed in a ring on the anchoring ring, and there are no fewer than three of them. The outer wall of the end of the anchoring sleeve near the target vertebra is formed with a tapered portion, and the diameter of the tapered portion gradually decreases towards the target vertebra.

[0016] Furthermore, the anti-slip microstructure consists of multiple micro-tooth blades arranged radially or concentrically, which are spaced apart on the outer wall of the conical part. The height of the micro-tooth blades is 0.3-0.8 mm, and the tooth tip angle is 45°-60°.

[0017] Furthermore, the adjustable guide positioning assembly consists of a ball joint and a mating groove. The mating groove is formed on the inner ring wall of the fitting ring body and is a spherical groove. The ball joint is movably embedded in the mating groove. The ball joint is hollow inside. The guide sleeve moves through the inside of the ball joint. The head of the locking member passes through the threaded hole and presses against the spherical wall of the ball joint.

[0018] Furthermore, a limiting groove is formed on the inner wall of the ball joint, and the limiting groove is distributed in a ring along the central axis of the ball joint. A limiting strip that cooperates with the limiting groove is fixedly installed on the outer wall of the guide sleeve, and the length of the limiting strip is greater than the length of the limiting groove.

[0019] Furthermore, the guide sleeve is composed of an outer sleeve and an inner sleeve. The limiting strip is fixedly installed on the outer wall of the outer sleeve. The inner sleeve moves through the outer sleeve and extends out of the outer sleeve at both ends. The inner sleeve can be a sleeve with different inner diameters.

[0020] Furthermore, a first magnetic ring is provided on the side of the outer sleeve away from the target vertebra, and a second magnetic ring is fixedly installed on the outer wall of the inner sleeve, with the first magnetic ring and the second magnetic ring attracting each other.

[0021] Compared with the prior art, the present invention provides a bony channel positioning guide for minimally invasive lumbar spine surgery;

[0022] 1. Initial positioning with the patient's skin surface is achieved by setting up a fitting ring and an anchoring ring. Then, the anchoring sleeve, which moves through the base plate and has anti-slip microstructures at its end, works in conjunction with the anchoring drill bit passing through the through hole in the anchoring sleeve and fixing it to the bony surface of the target vertebra, forming a stable and reliable temporary rigid connection between the entire guide and the bone surface. Based on this fixation, the angle of the guide sleeve can be adjusted as needed using an adjustable guiding and positioning component located between the guide sleeve and the fitting ring. When the bone drill or trephine saw passes through the hollow channel of the guide sleeve to establish a bony passage, the lateral force generated at the moment of contact between the drill tip and the bone surface is effectively offset because the anchoring sleeve and anchoring drill bit have anchored the entire guide to the bone surface, thus avoiding slippage and positioning drift of the drill on the bony surface. This structure allows the surgeon to obtain a precise bone tunnel entrance position without repeated fluoroscopic adjustments, improving the accuracy of passage establishment and reducing the surgical risk of nerve or dural sac damage due to drill slippage.

[0023] 2. This application further optimizes the structure of the anchoring sleeve by providing a tapered portion at one end near the bone surface and distributing anti-slip microstructures at intervals on the outer wall of the tapered portion. This allows the anchoring sleeve to stably abut against the arcuate surface of the facet joint in a gradually contracting manner when it contacts the bone surface. The micro-toothed blades can cut into the bone cortex with slight tapping, providing a reliable initial gripping force for the subsequent insertion of the anchoring drill bit.

[0024] By setting multiple ring-shaped base plates and corresponding anchor sleeves on the anchoring ring, multi-point, decentralized bone surface fixation is achieved, avoiding rotation or swaying that may occur at a single fixation point. Simultaneously, an adjustable guide positioning assembly consisting of a ball joint and a mating groove, along with a locking element passing through a threaded hole on the fitting ring to press against the ball joint wall, achieves rigid locking after the guide sleeve angle is adjusted, with uniform locking force and adjustable direction.

[0025] 3. This invention further adopts a split design of outer sleeve and inner sleeve for the guide sleeve, and prevents relative rotation by using limiting strips and limiting slots. It also utilizes the first magnetic ring and the second magnetic ring to realize the quick replacement and temporary fixation of inner sleeves with different inner diameters, so that the same guide can be adapted to bone drills or trephines of various diameters, thus improving the flexibility of surgery. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0027] Figure 1 A schematic diagram of the overall structure of the bony channel positioning guide for minimally invasive lumbar spine surgery provided in an embodiment of the present invention;

[0028] Figure 2 This is a cross-sectional view of the fitting ring component structure provided in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of components such as the fitting ring and the anchoring ring provided in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the anchoring sleeve and micro-toothed blade component provided in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the structure of components such as the fitting ring and the ball joint provided in an embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the structure of components such as the outer sleeve and the limiting strip provided in an embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the structure of the inner sleeve and the second magnetic ring, etc., provided in an embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1. Fitting ring; 2. Anchoring ring; 3. Base plate; 4. Anchoring sleeve; 401. Tapered part; 5. Through hole; 6. Anchoring drill bit; 7. Guide sleeve; 701. Outer sleeve; 702. Inner sleeve; 8. Elastic layer; 9. Annular groove; 10. Threaded hole; 11. Locking element; 12. Miniature toothed edge; 13. Ball joint; 14. Mating groove; 15. Limiting groove; 16. Limiting strip; 17. First magnetic ring; 18. Second magnetic ring. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] As attached Figure 1 To be continued Figure 7 As shown:

[0038] Example 1:

[0039] The present invention provides a bony channel positioning guide for minimally invasive lumbar spine surgery, comprising a fitting ring 1, an anchoring ring 2, a base plate 3, an anchoring sleeve 4, an anchoring drill bit 6, a guide sleeve 7, and an adjustable guiding and positioning assembly.

[0040] The fitting ring 1 is circular and hollow inside, designed to adhere to the patient's skin surface. An elastic layer 8 is provided on the lower surface of the fitting ring 1 (the side closest to the patient), and an adhesive layer is provided on the lower surface of the elastic layer 8 to temporarily attach the fitting ring 1 to the skin and prevent displacement during surgery. The outer ring wall of the fitting ring 1 forms a concave annular groove 9. The anchoring ring 2 is movably engaged within the annular groove 9, achieving a detachable connection with the fitting ring 1.

[0041] The base plate 3 is fixedly mounted on the annular outer wall of the anchoring ring 2. In this embodiment, there are three base plates 3, evenly distributed along the circumference of the anchoring ring 2. An anchoring sleeve 4 moves movably through each base plate 3, and the anchoring sleeve 4 can move up and down along the thickness direction of the base plate 3. The lower end of the anchoring sleeve 4 (the end closer to the target vertebra) is used to temporarily fix it to the bony surface of the target vertebra. A tapered portion 401 is formed on the outer wall of this end, and the diameter of the tapered portion 401 gradually decreases towards the bone surface. An anti-slip microstructure is provided on the outer wall of the tapered portion 401. The microstructure consists of multiple radially arranged micro-tooth blades 12, which are spaced apart on the outer surface of the tapered portion 401.

[0042] The height of the miniature cutting edge 12 is 0.3-0.8mm, and the tooth tip angle is 45°-60°.

[0043] Each anchoring sleeve 4 has a through hole 5, which penetrates the wall of the anchoring sleeve 4 radially. One end of the anchoring drill 6 passes through the through hole 5 and can continue drilling into the bony surface of the target vertebral body, thereby achieving temporary rigid fixation between the anchoring sleeve 4 and the bone surface. The other end of the anchoring drill 6 remains outside the anchoring sleeve 4 for easy removal after surgery.

[0044] The guide sleeve 7 moves through the interior of the fitting ring 1. The guide sleeve 7 has a hollow channel for guiding a bone drill or trephine saw to establish a bony channel. An adjustable guide positioning assembly is provided between the guide sleeve 7 and the fitting ring 1 for adjusting the angle of the guide sleeve 7. In this embodiment, the adjustable guide positioning assembly consists of a ball joint 13 and a mating groove 14. The mating groove 14 is formed on the inner ring wall of the fitting ring 1 and is a spherical groove. The ball joint 13 is movably embedded in the mating groove 14, and the interior of the ball joint 13 is hollow. The guide sleeve 7 moves through the interior of the ball joint 13. The ball joint 13 can rotate freely within the mating groove 14, thereby causing the guide sleeve 7 to change its axial direction.

[0045] A series of threaded holes 10 are formed in the annular groove 9 of the fitting ring 1. The axis of the threaded holes 10 is perpendicular to the central axis of the fitting ring 1, and the center of the threaded holes 10 and the center of the fitting ring 1 are located in the same vertical plane. A locking member 11 is provided on the anchoring ring 2. The threaded part of the locking member 11 cooperates with the threaded holes 10. The head of the locking member 11 passes through the threaded hole 10 and presses against the ball joint 13. When the locking member 11 is tightened, its head abuts against the ball joint 13, thereby locking the relative position of the ball joint 13 and the mating groove 14 and fixing the current angle of the guide sleeve 7.

[0046] In actual surgical procedures, the fitting ring 1 is first attached to the predetermined position on the patient's skin surface through the elastic layer 8 and the adhesive layer; the anchoring ring 2 is inserted into the annular groove 9 of the fitting ring 1; then the position of the anchoring sleeve 4 is adjusted so that its conical part 401 contacts the bone surface of the facet joint, and a gentle tapping causes the micro-toothed blade 12 to cut into the bone cortex. Subsequently, the anchoring drill 6 is passed through the through hole 5 and drilled into the bone for about 2-3 mm, completing the rigid fixation of the guide to the bone surface; next, the locking member 11 is loosened, and the guide sleeve 7 is adjusted to the required angle through the ball joint 13, and the locking member 11 is tightened again; finally, a trephine saw or bone drill is drilled through the hollow channel of the guide sleeve 7. Since the entire guide is firmly anchored to the bone surface through the anchoring sleeve 4 and the anchoring drill 6, the drill will not slip or drift when contacting the bone surface.

[0047] Example 2:

[0048] This embodiment is a further optimization based on Embodiment 1, as shown in the appendix. Figure 2 Appendix Figure 3 As shown. In this embodiment, the elastic layer 8 of the fitting ring 1 is made of medical-grade silicone material with a thickness of 2-5mm, which can buffer the impact force during surgical operations and improve the comfort of skin contact. The adhesive layer is medical-grade pressure-sensitive adhesive with a release film on the surface. The release film can be removed before use to adhere it to the skin.

[0049] The anchoring ring 2 and the annular groove 9 of the fitting ring 1 engage with a clearance fit. The anchoring ring 2 can rotate a certain angle around the circumference of the fitting ring 1 within the annular groove 9, facilitating the surgeon to adjust the orientation of the base plate 3 and the anchoring sleeve 4 according to the puncture approach. There are four threaded holes 10, evenly distributed around the annular groove 9. Correspondingly, there are also four locking elements 11. Each locking element 11 operates independently, allowing for adjustment of the clamping force on the ball joint 13 in different directions, thereby achieving more precise angle locking.

[0050] In this embodiment, there are four substrates 3, which are evenly distributed along the annular outer wall of the anchoring ring 2. Each substrate 3 is provided with a guide hole, through which the anchoring sleeve 4 passes and can slide axially. The upper end (the end away from the bone surface) of the anchoring sleeve 4 is provided with a pressing platform, which makes it easy for the surgeon to apply downward pressure with his fingers so that the micro-toothed blades 12 of the conical part 401 can cut into the bone cortex.

[0051] The anchoring drill bit 6 is a 1.0mm diameter Kirschner wire with a tapered tip and a connecting part at the tail, allowing it to be connected to an electric drill or hand drill. After passing through the through hole 5, the anchoring drill bit 6 is slowly drilled into the cortical bone of the facet joint for about 2-3mm under the drive of the electric drill, ensuring that it does not penetrate the contralateral cortex to avoid nerve damage. The axis of the through hole 5 forms a 30° angle with the axis of the anchoring sleeve 4, allowing the anchoring drill bit 6 to drill into the bone surface at an inclined angle, increasing the pull-out resistance.

[0052] The guide sleeve 7 is made of metal with a smooth inner wall, facilitating the passage of bone drills or trephine saws. A medical-grade lubricating coating is applied between the ball joint 13 and the mating groove 14 to ensure smooth angle adjustment. The locking element 11 is a set screw with a handle and a soft washer at its head to prevent damage to the surface of the ball joint 13.

[0053] The other structures and operation methods of this embodiment are the same as those of Embodiment 1, and will not be repeated here.

[0054] Example 3:

[0055] This embodiment further improves the structure of the guide sleeve 7 based on embodiment two, as shown in the attached figure. Figure 1 Appendix Figure 5 Appendix Figure 6 Appendix Figure 7As shown. The guide sleeve 7 consists of an outer sleeve 701 and an inner sleeve 702. A limiting groove 15 is formed on the inner wall of the ball joint 13, and the limiting groove 15 is distributed in a ring along the central axis of the ball joint 13. A limiting strip 16 is fixedly installed on the outer wall of the outer sleeve 701. The limiting strip 16 cooperates with the limiting groove 15, and the length of the limiting strip 16 is greater than the length of the limiting groove 15. When the outer sleeve 701 is inserted into the ball joint 13, the limiting strip 16 is engaged in the limiting groove 15, restricting the relative rotation between the outer sleeve 701 and the ball joint 13, but still allowing the outer sleeve 701 to slide axially within a certain range (because the length of the limiting strip 16 is greater than the limiting groove 15, the outer sleeve 701 can move axially a certain distance without coming out).

[0056] The inner sleeve 702 moves through the interior of the outer sleeve 701, and both ends of the inner sleeve 702 extend out of the outer sleeve 701. The inner sleeve 702 can be a sleeve with different inner diameters, such as a series of sleeves with inner diameters of 3mm, 5mm, and 7mm, to accommodate bone drills or trephine saws of different diameters. A first magnetic ring 17 is provided at the upper end of the outer sleeve 701 (the side furthest from the target vertebra), and a second magnetic ring 18 is fixedly installed on the outer wall of the inner sleeve 702. The first magnetic ring 17 and the second magnetic ring 18 attract each other. When the inner sleeve 702 is inserted into the outer sleeve 701 to a predetermined depth, the second magnetic ring 18 and the first magnetic ring 17 automatically engage, temporarily fixing the inner sleeve 702 inside the outer sleeve 701. When it is necessary to replace the inner sleeve 702 with one of different inner diameters, it can be pulled out with slight force to overcome the magnetic attraction.

[0057] During the procedure, the surgeon first selects an inner sleeve 702 with a corresponding inner diameter based on the diameter of the chosen bone drill or trephine, inserts it into the outer sleeve 701, and fixes it in place by the first magnetic ring 17 and the second magnetic ring 18. Then, the overall anchoring and angle adjustment of the guide are completed according to the method in Example 1. During drilling, the bone drill passes through the hollow channel of the inner sleeve 702. Because the inner sleeve 702 and the bone drill have a clearance fit and the inner sleeve 702 is stably supported by the outer sleeve 701 and the ball joint 13, the rotation center of the bone drill is precisely limited to the predetermined axis, further eliminating the risk of slippage.

[0058] When it is necessary to change the drilling angle, loosen the locking piece 11. Due to the cooperation between the limiting strip 16 and the limiting groove 15, rotating the outer sleeve 701 will drive the ball joint 13 to rotate within the mating groove 14, thereby adjusting the overall angle of the guide sleeve 7. After adjustment, tighten the locking piece 11 again.

[0059] The other structures and operation methods of this embodiment are the same as those of Embodiment 2, and will not be described again here.

[0060] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A bony channel positioning guide for minimally invasive lumbar spine surgery, characterized in that, include: The fitting ring (1) is hollow inside and is used to fit onto the patient's skin surface; Anchoring ring (2) is detachably installed on the fitting ring (1); The base plate (3) is fixedly installed on the annular outer wall of the anchoring ring (2); Anchor sleeve (4) moves through the base plate (3) and is used to temporarily fix it to the bony surface of the target vertebral body. Anti-slip microstructures are provided on the outer wall of the end of the anchor sleeve (4) near the target vertebral body. A through hole (5) is formed on the anchor sleeve (4); An anchoring drill bit (6), one end of which passes through the through hole (5) and is fixed to the bony surface of the target vertebral body; A guide sleeve (7) moves through the interior of the fitting ring (1) and has a hollow channel for guiding a bone drill or trestle. An adjustable guide positioning component is disposed between the guide sleeve (7) and the fitting ring (1) for adjusting the angle of the guide sleeve (7).

2. The bony channel positioning guide for minimally invasive lumbar spine surgery according to claim 1, characterized in that, The fitting ring (1) has an elastic layer (8) on the side close to the human body, and the elastic layer (8) has an adhesive layer on the side close to the human body. The outer ring wall of the fitting ring (1) forms an indented annular groove (9), and the anchoring ring (2) is movably engaged in the annular groove (9).

3. The bony channel positioning guide for minimally invasive lumbar spine surgery according to claim 2, characterized in that, The annular groove (9) of the fitting ring (1) has annularly distributed threaded holes (10). The axis of the threaded holes (10) is perpendicular to the central axis of the fitting ring (1), and the center of the threaded holes (10) and the center of the fitting ring (1) are located in the same vertical plane. The anchoring ring (2) is provided with a locking member (11), and the threaded part of the locking member (11) cooperates with the threaded holes (10).

4. The bony channel positioning guide for minimally invasive lumbar spine surgery according to claim 1, characterized in that, The substrate (3) is distributed in a ring on the anchoring ring (2), and there are no fewer than three of them. The outer wall of the anchoring sleeve (4) near the target vertebra is formed with a conical part (401), and the diameter of the conical part (401) gradually decreases towards the target vertebra.

5. A bony channel positioning guide for minimally invasive lumbar spine surgery according to claim 4, characterized in that, The anti-slip microstructure consists of multiple micro-tooth blades (12) arranged radially or concentrically. The micro-tooth blades (12) are spaced apart on the outer wall of the conical part (401). The height of the micro-tooth blades (12) is 0.3-0.8 mm and the tooth tip angle is 45°-60°.

6. A bony channel positioning guide for minimally invasive lumbar spine surgery according to claim 3, characterized in that, The adjustable guide positioning assembly consists of a ball joint (13) and a mating groove (14). The mating groove (14) is formed on the inner ring wall of the fitting ring (1). The mating groove (14) is a spherical groove. The ball joint (13) is movably embedded in the mating groove (14). The ball joint (13) is hollow inside. The guide sleeve (7) moves through the inside of the ball joint (13). The head of the locking member (11) passes through the threaded hole (10) and presses against the spherical wall of the ball joint (13).

7. A bony channel positioning guide for minimally invasive lumbar spine surgery according to claim 6, characterized in that, A limiting groove (15) is formed on the inner wall of the ball joint (13). The limiting groove (15) is distributed in a ring along the central axis of the ball joint (13). A limiting strip (16) that cooperates with the limiting groove (15) is fixedly installed on the outer wall of the guide sleeve (7). The length of the limiting strip (16) is greater than the length of the limiting groove (15).

8. A bony channel positioning guide for minimally invasive lumbar spine surgery according to claim 7, characterized in that, The guide sleeve (7) is composed of an outer sleeve (701) and an inner sleeve (702). The limiting strip (16) is fixedly installed on the outer wall of the outer sleeve (701). The inner sleeve (702) moves through the outer sleeve (701) and extends out of the outer sleeve (701) at both ends. The inner sleeve (702) can be a sleeve with different inner diameters.

9. A bony channel positioning guide for minimally invasive lumbar spine surgery according to claim 8, characterized in that, The outer sleeve (701) has a first magnetic ring (17) on the side away from the target vertebra, and the inner sleeve (702) has a second magnetic ring (18) fixedly installed on the outer wall. The first magnetic ring (17) and the second magnetic ring (18) attract each other.

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