A vertebral anchoring and positioning hole-expanding device

Abstract

This utility model relates to a vertebral anchoring and positioning reaming device, comprising: a working sleeve, which includes a sleeve body and a first cylindrical channel disposed within the sleeve body and extending axially; the lower end of the sleeve body has an arc-shaped serrated structure surrounding the end face of the first cylindrical channel; and an eccentric reamer for insertion within the first cylindrical channel, comprising a cylindrical drill rod, a second cylindrical channel disposed within the drill rod, and a drill bit disposed at the lower end of the drill rod and connected to the second cylindrical channel; the second cylindrical channel and the central axis of the drill rod are not on the same straight line. Compared with the prior art, this utility model has advantages such as reliable anchoring and precise bone removal.

Description

Technical Field

[0001] This utility model relates to orthopedic medical devices, and in particular to a vertebral anchoring and positioning hole-expanding device. Background Technology

[0002] Nearly 20 years later, spinal endoscopic techniques and methods have made significant progress, with two emerging approaches based on extraforaminal and interlaminar approaches. The foraminal approach has seen substantial development thanks to a better understanding of the Kambin safety zone, guiding surgeons to utilize this working corridor to address foraminal lesions. In 1996, Matthews described foraminal epidural endoscopic surgery, and in 1998, Ditsworth published a series of studies involving 110 patients undergoing foraminal endoscopic surgery. In 1997, Foley first described microendoscopic discectomy and demonstrated its practicality in treating central and lateral spinal canal occultations.

[0003] Since the first description of the transforaminal and interlaminar endoscopic approach, advancements in techniques, instruments, and methods related to endoscopic spinal surgery have led to wider adoption and application. The extraforaminal approach has resulted in the expansion of the "total endoscopy" platform, which features a single access route and a single working instrument.

[0004] Endoscopic spinal surgery is now performed globally for the treatment of cervical, thoracic, and lumbar spine disorders, with a growing body of international literature demonstrating its effectiveness and safety. As surgeons increasingly utilize endoscopic methods in spinal surgery, this medical technology has been further developed and advanced, making these procedures more accessible. In this way, there are striking similarities between spinal endoscopic surgery and arthroscopic surgery. In the 1950s and 1960s, peripheral arthroscopy developed as an alternative to standard open surgery, eventually transitioning from a diagnostic tool to a therapeutic platform. Half a century later, arthroscopic surgery is now one of the most common elective surgeries worldwide. Following the trajectory of arthroscopic interventions in other areas of musculoskeletal medicine, we may see continued growth and application of spinal endoscopic surgery, potentially eventually becoming a dominant method in spinal surgery.

[0005] The surgical methods and applications of spinal endoscopic surgery: The two most commonly used methods for endoscopic surgery of the cervical, thoracic, and lumbar spine are the posterior (or interlaminar) approach and the lateral approach (or through the intervertebral foramen). In the lateral extraforaminal approach, instruments are inserted through an incision into the extraforaminal and lateral intervertebral foraminal regions, commonly referred to as the Kambin triangle. Figure 1 This method allows direct access to the intervertebral foramen and is most effective for nerve compression in isolated unilateral intervertebral foramen or central canal secondary to ventral intervertebral disc lesions.

[0006] The core of the commonly used lateral approach percutaneous endoscopic lumbar discectomy (PELD) technique is to perform superior articular process reconstruction, which requires preserving the facet joints and maintaining spinal stability. This allows the working cannula and endoscope to pass smoothly through the intervertebral foramen into the spinal canal for surgery. Currently, there are two main methods for superior articular process reconstruction (…). Figure 2 There are two main methods for shaping the superior articular process: one is to use a burr to gradually enlarge and grind the ventral side of the superior articular process after inserting a guidewire; the other is to use a trephine saw to shape the ventral side of the superior articular process after inserting a guidewire. The former is relatively safer, but less efficient, requiring alternating burrs of different grits (1-4) and often resulting in insufficient shaping of the ventral side of the superior articular process, affecting the surgical field and operating space. The latter is more efficient, and can achieve the desired shape in one procedure if the positioning is accurate. However, in practice, it is sometimes difficult for the surgeon to anchor the target point on the ventral side of the superior articular process, often resulting in excessive bone removal and causing instability of the articular process joint.

[0007] Currently, more and more clinicians are starting to use trephine saws for shaping. Figure 3 However, a clinical challenge lies in anchoring the superior articular processoplasty to the target point on the ventral side of the shoulder, leading to repeated trephineing and making precise control of bone removal difficult. Excessive bone removal affects the integrity and stability of the facet joint, causing postoperative lower back pain and iatrogenic lumbar instability. Insufficient bone removal limits the surgical field and operating space, potentially resulting in residual herniated disc and surgical failure. Successful trephineing would significantly shorten the operation time and greatly improve the patient's experience under local anesthesia.

[0008] Therefore, there is an urgent need for a vertebral anchoring and positioning device with reliable anchoring and precise bone removal. Patent publication number TWI649062B discloses a spinal reamer device, which includes a sleeve, an eccentric shaft, a force-applying component, and an eccentric reamer. The sleeve has a first end and a second end opposite to each other. The eccentric shaft is housed within the sleeve. The force-applying component is connected to the eccentric shaft and is adjacent to the first end of the sleeve. The eccentric reamer is connected to the eccentric shaft and is located at the second end of the sleeve. When the force-applying component rotates, the eccentric reamer rotates relative to the sleeve via the eccentric shaft, allowing the spinal reamer device to have a folded state and an operational state. However, this device is primarily used for pedicle bone reaming to reduce the risk of fracture. Its main application is vertebral fracture distraction and reduction. After entering the vertebral body, the eccentric reamer is used to adjust the position to reach the desired fracture site, and then the spinal reamer device is used to distract and reduce the fracture site. When applied to discectomy, the eccentric reamer element is used to cut the nucleus pulposus, thereby achieving the desired treatment. Utility Model Content

[0009] The purpose of this invention is to overcome the defects of the existing technology and provide a vertebral anchoring and positioning hole-expanding device that provides reliable anchoring and precise bone removal.

[0010] The objective of this utility model can be achieved through the following technical solutions:

[0011] A vertebral anchoring and positioning hole-expanding device, comprising:

[0012] The working sleeve includes a sleeve body and a first cylindrical channel disposed in the sleeve body and extending axially. The lower end of the sleeve body is an arc-shaped sawtooth structure disposed around the end face of the first cylindrical channel.

[0013] An eccentric reamer for insertion within the first cylindrical channel includes a cylindrical drill rod, a second cylindrical channel disposed within the drill rod, and a drill bit disposed at the lower end of the drill rod and connected to the second cylindrical channel. The second cylindrical channel and the central axis of the drill rod are not on the same straight line.

[0014] Furthermore, the arc of the arc-shaped sawtooth structure is 120°~270°, preferably 160°~200°, and even more preferably 180°.

[0015] Furthermore, the sawtooth shape of the arc-shaped sawtooth structure is a standard tooth, hook tooth, RP tooth, Master-tooth, or tensile tooth.

[0016] Furthermore, the working sleeve also includes a handle portion fitted onto the upper end of the sleeve body.

[0017] Furthermore, the handle portion includes a connector fitted onto the upper end of the sleeve body and a handle connected to the connector.

[0018] Furthermore, the length of the drill rod is greater than the length of the casing body, and the diameter of the drill rod is smaller than the diameter of the first cylindrical channel.

[0019] Furthermore, the diameter of the cross-sectional circle of the second cylindrical channel is 45% to 55% of the diameter of the cross-sectional circle of the drill pipe.

[0020] Furthermore, the drill bit is a frustum-shaped drill bit, and its sidewall is provided with a hole communicating with the second cylindrical channel.

[0021] Furthermore, the second cylindrical channel is tangent to the drill rod.

[0022] Furthermore, the drill rod is provided with an axially penetrating guide wire connection hole, which is located on the tangent between the second cylindrical channel and the drill rod.

[0023] Furthermore, the length of the drill bit is 3% to 6% of the length of the drill rod.

[0024] Furthermore, the vertebral anchoring and positioning reaming device is used in conjunction with the ring saw. The diameter of the first cylindrical channel of the working sleeve is larger than the outer diameter of the ring saw, and the inner diameter of the ring saw is larger than the outer diameter of the drill rod of the eccentric reamer. In use, the ring saw is sleeved on the outside of the eccentric reamer, and the inner wall of the ring saw is tightly attached to the outer wall of the eccentric reamer.

[0025] Furthermore, the eccentric reamer can replace the drill when used alone to enlarge wounds. It can enlarge wounds by rotating the eccentric reamer, without the need to use multiple drills of different diameters to enlarge wounds sequentially.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] (1) Traditional smooth working sleeves lack an arc-shaped serrated structure and cannot be anchored to the superior articular process. As a result, when the trephine is formed through the working sleeve, it is easy to remove too much bone or fail to reach the target point on the ventral side of the superior articular process, thus requiring repeated X-ray fluoroscopy adjustments to perform trephine bone removal. Moreover, due to the lack of anchoring function, it is impossible to guarantee that bone removal will be performed at the originally designed position during the trephine forming process, which may cause iatrogenic injury. This utility model sets an arc-shaped serrated structure at the lower end of the sleeve body around the end face of the first cylindrical channel. The arc-shaped serrated structure anchors the working sleeve to the ventral side of the superior articular process, which is equivalent to "holding" the superior articular process, thus enabling reliable anchoring and preventing displacement, thereby making the subsequent trephine bone removal more accurate.

[0028] (2) The eccentric reamer can be used alone to enlarge wounds instead of a drill. It can enlarge wounds by rotating the eccentric reamer, without the need to use multiple drills of different diameters to enlarge the wounds in sequence. This is because the drill bit of the eccentric reamer is not located at the center of the drill rod, and when it rotates, it has a larger radius of rotation than a non-eccentric reamer.

[0029] (3) When the ring saw is deboned, the working sleeve is first anchored on the upper articular process, and then the eccentric expander is inserted into the first cylindrical channel to position the ring saw. Then the ring saw is inserted so that the ring saw is located between the eccentric expander and the first cylindrical channel, so that the deboning position is more accurate and the bone in the eccentric expander is not ground away, and the amount of bone removed in a single operation is smaller.

[0030] (4) By setting an eccentric reamer, this utility model ensures that the second cylindrical channel and the central axis of the drill rod are not on the same straight line, thus giving the eccentric reamer a larger rotation range during rotation. When a certain deviation is found in the position of the working sleeve, it can be further adjusted to the upper articular process forming target point by rotating the eccentric reamer, thereby making the insertion position of the ring saw more accurate, avoiding excessive bone removal, and making the bone removal forming more precise.

[0031] (5) The vertebral anchoring and positioning dilatation device of this utility model is applied to intervertebral disc herniation and spinal stenosis. Specifically, during percutaneous endoscopic discectomy, it controls the amount of bone removed during superior articular process shaping, preserves the articular process joint, and thus protects the stability of the spinal articular process joint. Using the vertebral anchoring and positioning dilatation device for superior articular process shaping is an essential step in the channel establishment process before percutaneous endoscopic discectomy. By designing the vertebral anchoring and positioning dilatation device to be anchored on the ventral side of the superior articular process, after the anchoring is secure, a trephine is used to remove the bone on the ventral side of the superior articular process through the anchoring sleeve. If the position after anchoring is not ideal, the position can be adjusted to the ventral side of the superior articular process by designing an eccentric dilatation device, and then the corresponding bone removal operation can be performed. Subsequent surgical steps such as nucleus pulposus removal do not require the use of an eccentric dilatation element.

[0032] (6) The vertebral anchoring and positioning hole-expanding device of this utility model is simple and convenient to operate. It does not require repeated adjustment of the position of the working sleeve and the ring saw during use, which greatly reduces the radiation exposure of patients and doctors during clinical use. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of the lateral intervertebral foramen region;

[0034] Figure 2 The diagram shows the structure of a drill and a ring saw, (a) a drill and (b) a ring saw.

[0035] Figure 3 A schematic diagram of the standard procedure for superior articular process shaping using a trephine saw in a lateral approach percutaneous endoscopic lumbar discectomy: (a) Axial view: The working cannula is placed on the ventral side of the superior articular process; (b) Sagittal view: The working cannula is placed on the ventral side of the superior articular process; (c) Axial view: The trephine saw enters through the working cannula to perform osteotomy and shaping of the superior articular process; (d) Axial view: After the superior articular process shaping is completed, the herniated nucleus pulposus is removed; (e) Sagittal view: The superior articular process shaping is completed after the nucleus pulposus is removed; (f) The superior articular process shaping is completed.

[0036] Figure 4 This is a schematic diagram of the working sleeve shown in Example 1;

[0037] Figure 5 This is a front view of the working sleeve shown in Example 1;

[0038] Figure 6 This is a top view of the working sleeve shown in Example 1;

[0039] Figure 7 This is a front view of the eccentric expander shown in Example 1;

[0040] Figure 8 This is a top view of the eccentric expander shown in Example 1.

[0041] Explanation of markings in the diagram:

[0042] 1-Working sleeve, 11-Sleeve body, 12-First cylindrical channel, 13-Arc-shaped serrated structure, 14-Handle part, 141-Connector, 142-Handle;

[0043] 2-Eccentric reamer, 21-Drill rod, 211-Guide wire insertion hole, 22-Second cylindrical channel, 23-Drill bit, 231-Hole. Detailed Implementation

[0044] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments. In the following embodiments or examples, unless otherwise specified, the functional components or structures are conventional components or structures used in the art to achieve the corresponding functions.

[0045] It should be noted that in the description of this utility model, the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0047] A vertebral anchoring and positioning hole-expanding device, comprising:

[0048] The working sleeve 1 includes a sleeve body 11 and a first cylindrical channel 12 disposed in the sleeve body 11 and extending axially. The lower end of the sleeve body 11 is an arc-shaped sawtooth structure 13 disposed around the end face of the first cylindrical channel 12.

[0049] An eccentric reamer 2, which is inserted into the first cylindrical channel 12, includes a cylindrical drill rod 21, a second cylindrical channel 22 disposed within the drill rod 21, and a drill bit 23 disposed at the lower end of the drill rod 21 and connected to the second cylindrical channel 22. The second cylindrical channel 22 and the central axis of the drill rod 21 are not on the same straight line.

[0050] In some specific embodiments, the arc of the arc-shaped sawtooth structure 13 is 120°~270°, preferably 160°~200°, and more preferably 180°.

[0051] In some specific embodiments, the sawtooth shape of the arc-shaped sawtooth structure 13 is a standard tooth, hook tooth, RP tooth, Master-tooth, or tensile tooth.

[0052] In some specific embodiments, the working sleeve 1 further includes a handle portion 14 fitted onto the upper end of the sleeve body 11.

[0053] In some specific embodiments, the handle portion 14 includes a connector 141 fitted onto the upper end of the sleeve body 11 and a handle 142 connected to the connector 141.

[0054] In some specific embodiments, the length of the drill rod 21 is greater than the length of the casing body 11, and the diameter of the drill rod 21 is smaller than the diameter of the first cylindrical channel 12.

[0055] In some specific embodiments, the diameter of the cross-sectional circle of the second cylindrical channel 22 is 45% to 55% of the diameter of the cross-sectional circle of the drill rod 21.

[0056] In some specific embodiments, the drill bit 23 is a frustum-shaped drill bit, and its sidewall is provided with a hole 231 communicating with the second cylindrical channel 22.

[0057] In some specific embodiments, the second cylindrical channel 22 is tangent to the drill rod 21.

[0058] In some specific embodiments, the drill rod 21 is provided with an axially penetrating guide wire hole 211, which is located on the tangent between the second cylindrical channel 22 and the drill rod 21.

[0059] In some specific embodiments, the length of the drill bit 23 is 3% to 6% of the length of the drill rod 21.

[0060] In some specific embodiments, the vertebral anchoring and positioning reaming device is used in conjunction with a ring saw. The diameter of the first cylindrical channel 12 of the working sleeve 1 is larger than the outer diameter of the ring saw, and the inner diameter of the ring saw is larger than the outer diameter of the drill rod 21 of the eccentric reamer 2. In use, the ring saw is fitted around the outside of the eccentric reamer 2, and the inner wall of the ring saw is tightly attached to the outer wall of the eccentric reamer 2.

[0061] In some specific embodiments, the eccentric reamer 2 can replace the drill when used alone to enlarge the wound. It can enlarge the wound by rotating the eccentric reamer 2, without the need to use multiple drills of different diameters to enlarge the wound in sequence.

[0062] Each of the above embodiments can be implemented individually or in any combination of two or more.

[0063] The following description uses specific examples to illustrate the point.

[0064] Example 1

[0065] A vertebral anchoring and positioning hole-expanding device, such as Figures 4-8 As shown, it includes:

[0066] The working sleeve 1 includes a sleeve body 11 and a first cylindrical channel 12 disposed in the sleeve body 11 and extending axially. The lower end of the sleeve body 11 is an arc-shaped sawtooth structure 13 disposed around the end face of the first cylindrical channel 12.

[0067] An eccentric reamer 2, which is inserted into the first cylindrical channel 12, includes a cylindrical drill rod 21, a second cylindrical channel 22 disposed within the drill rod 21, and a drill bit 23 disposed at the lower end of the drill rod 21 and connected to the second cylindrical channel 22. The second cylindrical channel 22 and the central axis of the drill rod 21 are not on the same straight line.

[0068] In this embodiment, the first cylindrical channel 12 coincides with the central axis of the sleeve body 11.

[0069] In this embodiment, the arc of the arc-shaped sawtooth structure 13 is 180°.

[0070] In this embodiment, the sawtooth shape of the arc-shaped sawtooth structure 13 is a standard tooth.

[0071] In this embodiment, the working sleeve 1 further includes a handle portion 14 fitted onto the upper end of the sleeve body 11. The handle portion 14 includes a connector 141 fitted onto the upper end of the sleeve body 11 and a handle 142 connected to the connector 141. The connector 141 is annular, and the handle 142 is a flat cubic structure.

[0072] In this embodiment, the length of the drill rod 21 is greater than the length of the casing body 11, and the diameter of the drill rod 21 is smaller than the diameter of the first cylindrical channel 12.

[0073] In this embodiment, the diameter of the cross-sectional circle of the second cylindrical channel 22 is 50% of the diameter of the cross-sectional circle of the drill rod 21.

[0074] In this embodiment, the drill bit 23 is a frustum-shaped drill bit, and its sidewall is provided with a hole 231 that communicates with the second cylindrical channel 22.

[0075] In this embodiment, the second cylindrical channel 22 is tangent to the drill rod 21.

[0076] In this embodiment, the drill rod 21 is provided with an axially penetrating guide wire connection hole 211, which is located on the tangent between the second cylindrical channel 22 and the drill rod 21.

[0077] In this embodiment, the length of the drill bit 23 is 5% of the length of the drill rod 21.

[0078] In this embodiment, the sleeve body 11 has a length of 150mm, the first cylindrical channel 12 has a diameter of 8mm, the sleeve body 11 has a thickness of 1.2mm, and the connector 141 has a thickness of 6.8mm.

[0079] In this embodiment, the drill rod 21 is 200mm long, the drill bit 23 is 10mm long, the drill rod 21 is 6.4mm in diameter, the second cylindrical channel 22 is 3.2mm in diameter, and the lower end of the drill bit 23 is 2.5mm in diameter.

[0080] In this embodiment, the working sleeve 1 and the eccentric expander 2 are made of hard steel with smooth surfaces, free from defects such as burrs, cracks, and scratches, ensuring unobstructed pipes without blockages.

[0081] In this embodiment, the vertebral anchoring and positioning hole-expanding device is used in conjunction with the ring saw. The diameter of the first cylindrical channel 12 of the working sleeve 1 is larger than the outer diameter of the ring saw, and the inner diameter of the ring saw is larger than the outer diameter of the drill rod 21 of the eccentric hole expander 2. In use, the ring saw is sleeved on the outside of the eccentric hole expander 2, and the inner wall of the ring saw is tightly attached to the outer wall of the eccentric hole expander 2.

[0082] In this embodiment, the eccentric reamer 2 can replace the drill when used alone to enlarge the wound. It can enlarge the wound by rotating the eccentric reamer 2, without the need to use multiple drills of different diameters to enlarge the wound in sequence.

[0083] In this embodiment, the specific procedure for performing percutaneous endoscopic discectomy on a patient with circumferential intervertebral disc herniation using the aforementioned vertebral anchoring and positioning dilatation device is as follows:

[0084] (1) The patient is placed in a prone position with a lumbar bridge placed on the abdomen. The needle insertion route is marked under the guidance of a C-arm machine, and corresponding surface markings are made.

[0085] (2) After routine disinfection and draping, and successful local anesthesia, insert the puncture needle to the appropriate position under the guidance of a C-arm according to the body surface markings. If the patient experiences radiating pain in the lower limbs during the puncture, the puncture direction and position need to be adjusted. Remove the needle core of the puncture needle, insert the guide wire along the needle sheath of the puncture needle to the predetermined position, remove the needle sheath, and inject iohexol and methylene blue into the intervertebral disc for staining, so as to observe the morphology of the intervertebral disc herniation and remove it.

[0086] (3) Make an incision of about 1 cm at the guide wire puncture site on the patient's body surface. Use the eccentric expander 2 to expand the incision. Rotate the eccentric expander 2 with the guide wire as the center of rotation to expand the incision to a suitable size. Then, insert the working sleeve 1 through the guide wire. Adjust the working sleeve 1 so that the arc-shaped serrated structure 13 at its lower end is anchored on the ventral side of the superior articular process, which is equivalent to "holding" the superior articular process. Compared with the traditional working sleeve, the anchoring is more secure and less prone to displacement. At this time, the first cylindrical channel 12 in the working sleeve 1 is aligned with the bone to be removed at the articular process. Then, insert the eccentric expander 2 into the first cylindrical channel 12 in the working sleeve 1. Insert the ring saw from the first cylindrical channel 12 of the working sleeve 1. The ring saw is fitted on the outside of the eccentric expander 2, and the inner wall of the ring saw is tightly attached to the outer wall of the eccentric expander 2 to perform precise bone removal and shaping. The eccentric expander 2 can be rotated 360° twice within the working sleeve 1 according to the actual situation. If intraoperative fluoroscopy shows that the working sleeve 1 is placed on the ventral side, the hole of the eccentric expander 2 can be rotated and adjusted to the bottom, and then the ring saw can be inserted for precise bone removal and shaping, thereby increasing the amount of bone removed during the ventral shaping of the articular process and achieving the ideal surgical field.

[0087] (4) After the bone is removed along the surgical approach, remove the ring saw and the eccentric expander 2. Without repeatedly changing the working sleeve, insert the percutaneous endoscopic imaging system along the working sleeve 1. Use different nucleus pulposus clamps to remove the protruding and degenerated nucleus pulposus tissue. Observe the nerve root release under the microscope. When the dural sac and nerve root show spontaneous pulsation, the nerve root release is complete.

[0088] (5) After completely removing the degenerated nucleus pulposus tissue, a disposable radiofrequency ablation head from the United States is inserted, and the energy is adjusted to 24 joules to continuously burn the normal nucleus pulposus tissue, causing it to shrink back and reshape. After that, the ruptured annulus fibrosus is sealed, and the high pressure in the spinal canal is completely relieved.

[0089] (6) After observing that there is no active bleeding in the surgical area, remove the working cannula 1, suture the skin, and the operation is over.

[0090] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. A vertebral anchoring and positioning hole-expanding device, characterized in that, include: The working sleeve (1) includes a sleeve body (11) and a first cylindrical channel (12) disposed in the sleeve body (11) and extending axially. The lower end of the sleeve body (11) is an arc-shaped sawtooth structure (13) arranged around the end face of the first cylindrical channel (12). An eccentric reamer (2) for insertion into the first cylindrical channel (12) includes a cylindrical drill rod (21), a second cylindrical channel (22) disposed within the drill rod (21), and a drill bit (23) disposed at the lower end of the drill rod (21) and connected to the second cylindrical channel (22). The second cylindrical channel (22) and the central axis of the drill rod (21) are not on the same straight line.

2. The vertebral anchoring and positioning hole-expanding device according to claim 1, characterized in that, The arc of the arc-shaped sawtooth structure (13) is 120°~270°.

3. The vertebral anchoring and positioning hole-expanding device according to claim 1, characterized in that, The sawtooth shape of the arc-shaped sawtooth structure (13) is a standard tooth, hook tooth, RP tooth, Master-tooth or tensile tooth.

4. The vertebral anchoring and positioning hole-expanding device according to claim 1, characterized in that, The working sleeve (1) also includes a handle (14) fitted onto the upper end of the sleeve body (11).

5. The vertebral anchoring and positioning hole-expanding device according to claim 1, characterized in that, The length of the drill rod (21) is greater than the length of the casing body (11), and the diameter of the drill rod (21) is smaller than the diameter of the first cylindrical channel (12).

6. The vertebral anchoring and positioning hole-expanding device according to claim 1, characterized in that, The diameter of the cross-sectional circle of the second cylindrical channel (22) is 45% to 55% of the diameter of the cross-sectional circle of the drill rod (21).

7. The vertebral anchoring and positioning hole-expanding device according to claim 1, characterized in that, The drill bit (23) is a frustum-shaped drill bit, and its side wall is provided with a hole (231) that communicates with the second cylindrical channel (22).

8. The vertebral anchoring and positioning hole-expanding device according to claim 1, characterized in that, The second cylindrical channel (22) is tangent to the drill rod (21).

9. The vertebral anchoring and positioning hole-expanding device according to claim 8, characterized in that, The drill rod (21) is provided with an axially penetrating guide wire connection hole (211), which is located on the tangent between the second cylindrical channel (22) and the drill rod (21).

10. The vertebral anchoring and positioning hole-expanding device according to claim 1, characterized in that, The length of the drill bit (23) is 3% to 6% of the length of the drill rod (21).

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