Depth limited spinal burr assist cannula

Abstract

The application provides a depth-limited spinal drill auxiliary sleeve, which comprises a pipe body for the drill to extend into, a limiting part arranged below the pipe body, and a clamping mechanism for clamping the bone to be ground, the clamping mechanism being arranged at the lower end of the pipe body and comprising at least two clamping parts, at least one of which is a movable clamping part, and the movable clamping part is adjusted to move relative to the other clamping parts through a first adjusting mechanism. Therefore, the drill auxiliary sleeve can be fixed on the bone to be ground, so that the surgeon only needs to control the direction of the drill auxiliary sleeve, without worrying that the drill auxiliary sleeve deviates from the position of the bone during grinding, and also without worrying that the drill auxiliary sleeve is moved downward together with the drill due to the downward grinding of the drill, so as to greatly reduce the difficulty of the operation, make the operation simpler, and enable the surgeon to focus more on the grinding of the drill, and the experience level required for the surgeon is not very high.

Description

Technical Field

[0001] This invention application relates to the technical field of medical assistive devices, specifically to a depth-limited spinal drill auxiliary sleeve. Background Technology

[0002] Spinal endoscopic surgery is one of the most commonly used minimally invasive methods for treating degenerative spinal diseases. In this type of surgery, a drill is usually used, for example, to remove part of the bony structure in order to expose the hyperplastic ligamentum flavum and the herniated intervertebral disc.

[0003] Currently, when using a grinding drill, both domestically and internationally, the drill cannula is typically inserted into the tissue to be ground first, and then the drill is inserted through the cannula to grind the bone tissue. Furthermore, to prevent the drill from grinding excessively and damaging the nerve, a limiting part is provided at the bottom of the drill cannula. This limiting part is placed between the nerve and the bone to restrict the drill from grinding excessively downwards and damaging the nerve.

[0004] However, existing drill cannulas lack clamping devices; they only use limiting sections to block nerves deep within the lamina. Therefore, during operation, the drill cannulas are prone to displacement, either deviating from the intended bone removal location or unintentionally moving downwards and compressing nerves. This can lead to the drill grinding into unnecessary areas or compressing and damaging nerves. Consequently, the surgeon must not only control the drill itself but also the position of the drill cannulas, making the procedure difficult, requiring intense concentration, and demanding a high level of experience from the surgeon.

[0005] Therefore, it is essential to develop a spinal drill-assisted cannula with a limited depth. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned problems and shortcomings by providing a depth-limited spinal drill auxiliary sleeve, which effectively solves the problems of existing drill sleeves easily deviating from the grinding position or compressing and damaging nerves during use, and the high difficulty of operation.

[0007] The technical solution of this invention is implemented as follows:

[0008] The present invention discloses a depth-limiting spinal drill auxiliary cannula, comprising a tube for the drill to be inserted, wherein the lower end of the tube is provided below the lower end inserted into the patient's body to prevent the drill from grinding nerves below the bone, characterized in that it further comprises a clamping mechanism for clamping the bone to be ground, the clamping mechanism being disposed at the lower end of the tube, the clamping mechanism comprising at least two clamping parts, wherein at least one clamping part is a movable clamping part, the movable clamping part being movable and adjustable relative to the other clamping parts by a first adjustment mechanism, and the limiting part being fixedly connected to the fixed clamping part or to the lower end face of the tube.

[0009] In some embodiments, the clamping mechanism includes two clamping parts: an upper clamping part and a lower clamping part. The upper clamping part is a movable clamping part, and it has a first position and a second position. The first position is the position where the upper end face of the upper clamping part meets the lower end face of the tube body, and the second position is the position where the lower end face of the upper clamping part meets the upper end face of the lower clamping part. The first adjusting mechanism controls the upper clamping part to move up and down between the first position and the second position. The lower clamping part constitutes the limiting part.

[0010] In some embodiments, the upper clamp is an arc-shaped strip upper clamp, wherein the outer arc surface of the arc-shaped strip upper clamp does not extend beyond the outer wall surface of the tube body, and the inner arc surface of the arc-shaped strip upper clamp does not extend beyond the inner wall surface of the tube body.

[0011] In some embodiments, the first adjusting mechanism includes an adjusting rod and an operating member. One end of the adjusting rod is connected to the movable clamping part, and the other end of the adjusting rod is connected to the operating member. When the operating member is operated, the adjusting rod drives the movable clamping part to move. The tube body is provided with a receiving position for accommodating the adjusting rod, and the operating member protrudes from the outer wall near the upper part of the tube body.

[0012] Furthermore, the adjusting rod is a rod extending upward along the length of the tube, the receiving position is recessed inward from the outer wall of the tube, and the adjusting rod is movably fitted into the receiving position; the operating element is a toggle key or knob for manually controlling the up and down movement of the adjusting rod.

[0013] Furthermore, the adjusting rod has a rack at its upper part; the operating element includes a knob, a gear, and a return spring, the gear meshes with the rack, and the knob and the gear are coaxially connected and fixed by a connecting post; the tube body has a mounting part, the connecting post passes through the mounting part so that the knob and the gear are located on the outer and inner sides of the mounting part respectively, and the knob and the gear can move relative to the mounting part in the axial direction; the inner side of the mounting part has a gear cavity that can accommodate part of the gear, and the return spring is connected between the knob and the outer side of the mounting part.

[0014] In some embodiments, the upper clamping portion includes a fixed arc-shaped portion and a movable extension portion. The movable extension portion is movably connected to the fixed arc-shaped portion. When the movable extension portion is in a first state, it together with the fixed arc-shaped portion forms an arc-shaped strip-shaped upper clamping portion. When the movable extension portion is in a second state, it extends laterally beyond the outer wall of the tube.

[0015] Furthermore, it also includes a second adjustment mechanism, which is connected to the movable extension to control the movable extension to switch between the first state and the second state.

[0016] Specifically, the movable extension includes a pair of rotating extension feet; the second adjustment mechanism includes a driving gear, a driven gear, a rotating shaft, and a toggle key. An output gear is fixedly provided on the rotating shaft of the corresponding rotating extension foot. One end of the rotating shaft is coaxially connected to the driving gear, and the other end of the rotating shaft is fixedly connected to the toggle key. One side of the driven gear meshes with one side of the driving gear. The output gear of one rotating extension foot meshes with the other side of the driving gear, and the output gear of the other rotating extension foot meshes with the other side of the driven gear.

[0017] In some embodiments, the tube body includes an upper tube body and a lower tube body, the clamping mechanism is disposed on the lower tube body, the lower end of the upper tube body is movably connected to the upper end of the lower tube body relative to each other along the axis, and the upper end of the upper tube body is fixedly connected to the handle of the drill.

[0018] The beneficial effects of this invention are:

[0019] 1. Because the present invention has a clamping mechanism on the drill auxiliary sleeve, the drill auxiliary sleeve can be fixed on the bone to be ground. In this way, the doctor only needs to control the direction of the drill auxiliary sleeve, without worrying that the drill auxiliary sleeve will accidentally deviate from the position of the bone when grinding the bone, or that the drill auxiliary sleeve will be accidentally moved downwards while grinding and compress or damage the nerves. Therefore, the difficulty of the operation is greatly reduced, the operation is simpler, the doctor can focus more on the grinding of the drill, and the requirements for the doctor's experience level are not very high.

[0020] 2. Because the movable clamping part of the clamping mechanism can be moved and adjusted through the adjustment mechanism, the clamping mechanism of the grinding auxiliary sleeve can clamp bone of different thicknesses and sizes, making it more versatile and the clamping more secure, effectively ensuring the safety of grinding.

[0021] 3. Because the upper clamp is provided with a movable extension, which can be rotated to the outside of the tube body, the clamping range of the upper clamp can be increased, so that part of the upper clamp is away from the periphery of the bone being ground. Therefore, the clamping of the upper clamp can be more stable, effectively avoiding the problem that the clamping may not be firm after the bone is ground by the drill because it is only clamped around the periphery of the bone being ground.

[0022] 4. Because the drill auxiliary cannula is designed in two parts, an upper tube and a lower tube, and the upper tube is fixedly connected to the drill handle, while its lower end is movablely connected to the lower tube along the axis, the operation can be further simplified. Doctors no longer need to control the direction of the drill auxiliary cannula, because the drill auxiliary cannula swings synchronously with the drill, and there will be no problem that the drill head is obstructed by the side wall of the drill auxiliary cannula.

[0023] The invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural schematic diagram of the drilling auxiliary sleeve according to Embodiment 1 of the present invention;

[0025] Figure 2 for Figure 1 A schematic diagram of the decomposed structure;

[0026] Figure 3 This is a partial structural diagram of the adjustable state of the first adjustment mechanism of the present invention;

[0027] Figure 4 This is a partial structural diagram of the first adjustment mechanism of the present invention in its non-adjustable state;

[0028] Figure 5 This is a three-dimensional structural schematic diagram of the drilling auxiliary sleeve according to Embodiment 2 of the present invention;

[0029] Figure 6 This is an exploded structural diagram of the upper clamping part of the present invention;

[0030] Figure 7 This is a three-dimensional structural schematic diagram of the second adjustment mechanism of the present invention;

[0031] Figure 8 This is a three-dimensional structural schematic diagram of the drilling auxiliary sleeve according to Embodiment 3 of the present invention;

[0032] Figure 9 for Figure 8 A schematic diagram of the decomposed structure;

[0033] Figure 10 This is a three-dimensional structural diagram of the auxiliary sleeve for grinding drills used in conjunction with the grinding drill of the present invention.

[0034] Figure label:

[0035] tube body 1;

[0036] Upper tube body 11, lower tube body 12, receiving position 13, mounting part 14, gear cavity 15, actuating groove 16, limiting groove 17, limiting protrusion 18, elastic sleeve interface 19;

[0037] Clamping mechanism 2;

[0038] Upper clamp 21;

[0039] Fixed arc-shaped part 211;

[0040] Gearbox position 2111, gearbox cover 2112;

[0041] Activity Extension Section 212;

[0042] Rotate the extension foot 2121 and the output gear 2122;

[0043] Lower clamping part 22, movable clamping part 201, fixed clamping part 202;

[0044] First regulating mechanism 3;

[0045] Adjusting rod 31;

[0046] Recess 311, rack 312, countersunk groove 313, through hole 314;

[0047] Operating component 32;

[0048] Knob 321, gear 322, return spring 323, connecting post 324;

[0049] Second regulating mechanism 4;

[0050] Driven gear 41, driven gear 42, rotating shaft 43, toggle key 44;

[0051] Limiting part 5;

[0052] 6-inch telescopic spring;

[0053] Locking ring 7;

[0054] Compression spring 8;

[0055] 9. Grinding drill;

[0056] Handle 91, grinding head 92. Detailed Implementation

[0057] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0058] In the description of this invention, it should be understood that the terms "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and 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, and therefore should not be construed as a limitation of this invention. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish and describe features, without any order or emphasis.

[0059] In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0060] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "fitting," "connected," "linked," and "installed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0061] The depth-limited spinal drill auxiliary sleeve of the present invention will now be described with reference to the accompanying drawings.

[0062] This invention relates to a depth-limited spinal drill auxiliary cannula, comprising a tube 1 into which the drill 9 extends. The tube 1 has a limiting portion 5 at its lower end, which prevents the drill 9 from grinding nerves beneath the bone. The invention is characterized by further including a clamping mechanism 2 for clamping the bone to be ground. This clamping mechanism 2 is located at the lower end of the tube 1, thus fixing the drill auxiliary cannula to the bone to be ground. This allows the surgeon to focus solely on controlling the direction of the drill auxiliary cannula, eliminating concerns about it accidentally deviating from the bone during grinding or compressing and damaging nerves due to the drill 9 moving downwards. This significantly reduces the difficulty of the surgery, simplifies the operation, and allows the surgeon to concentrate more on the grinding process, reducing the need for extensive experience.

[0063] The clamping mechanism 2 of the present invention includes at least two clamping parts, wherein at least one clamping part is a movable clamping part 201, which is adjusted relative to the other clamping parts by means of a first adjusting mechanism 3. Therefore, the clamping mechanism 2 of the grinding drill auxiliary sleeve can clamp bone of different thicknesses and sizes, making it more versatile and providing a more secure clamping, effectively ensuring the safety of grinding.

[0064] Understandably, the clamping mechanism 2 of the present invention may include two clamping parts, three clamping parts, four clamping parts, or more clamping parts.

[0065] Furthermore, the clamping direction of the clamping part is not limited. It can clamp the bone from both sides laterally; in this case, the clamping mechanism 2 could have two clamping parts, one on each side, clamping the bone with the clamping force in a transverse direction, perpendicular to the axis of the tube 1. Alternatively, it could have three clamping parts, clamping from the left, right, and top. It could also have four clamping parts, two spaced apart on each side, clamping the bone from both sides. It could also clamp the upper and lower ends of the bone from the top and bottom, such as... Figure 1 or Figure 5 The example shown.

[0066] Similarly, it is understandable that the clamping mechanism 2 may have only one movable clamping part 201. For example, if the clamping mechanism 2 has two clamping parts, then only one of the clamping parts needs to be movable to achieve clamping adjustment. Of course, both clamping parts can also be movable and adjustable. When the clamping mechanism 2 includes more clamping parts, more clamping parts can be movable clamping parts 201.

[0067] The limiting part 5 of the present invention can be fixedly connected to the fixed clamping part 202 or fixedly connected to the lower end face of the tube body 1. For example, if at least one of the clamping mechanisms 2 is a fixed clamping part 202, that is, a clamping part that is fixed relative to the tube body 1, then the limiting part 5 can be fixedly connected to the fixed clamping part 202. In this case, the fixed clamping part 202 is equivalent to a connector connecting the tube body 1 and the limiting part 5. Or, for example, if all the clamping parts on the clamping mechanism 2 are movable clamping parts 201, then the limiting part 5 can be fixedly connected to the lower section of the tube body 1 by providing a separate connector.

[0068] In such Figure 1 In the example shown, the clamping mechanism 2 includes two clamping parts: an upper clamping part 21 and a lower clamping part 22. The upper clamping part 21 is a movable clamping part 201. With this design, the lower clamping part 22 can form a limiting part 5, thus reducing the structural complexity of the clamping mechanism 2, making the drilling auxiliary sleeve structure simpler and more practical, and also reducing the failure rate.

[0069] In this example, the upper clamping part 21 has a first position and a second position. The first position is where the upper end face of the upper clamping part 21 meets the lower end face of the tube body 1, and the second position is where the lower end face of the upper clamping part 21 meets the upper end face of the lower clamping part 22. The first adjusting mechanism 3 controls the upper clamping part 21 to move up and down between the first and second positions. This design maximizes the clamping range of the clamping mechanism 2. Of course, it is also possible to set the first position of the upper clamping part 21 at a certain distance from the lower end face of the tube body 1, and similarly, the second position of the upper clamping part 21 can also be set at a certain distance from the upper end face of the lower clamping part 22.

[0070] To prevent the upper clamp 21 from interfering with the grinding head 92 of the drill 9 extending from the lower end face of the tube body 1 for grinding, in some embodiments, the upper clamp 21 is an arc-shaped strip upper clamp 21. The outer arc surface of the arc-shaped strip upper clamp 21 does not extend beyond the outer wall surface of the tube body 1, and the inner arc surface of the arc-shaped strip upper clamp 21 does not extend beyond the inner wall surface of the tube body 1. Of course, the above design is a preferred solution. In other embodiments, the outer arc surface of the arc-shaped strip upper clamp 21 can be allowed to extend beyond the outer wall surface of the tube body 1. The advantage of this is that it can increase the contact area between the upper clamp 21 and the bone, effectively avoiding the probability of the upper clamp 21 having weak contact after the grinding head 92 grinds the bone. However, the disadvantage is that the part extending beyond the outer wall surface of the tube body 1 cannot be retracted. Therefore, when the drill auxiliary tube 1 is inserted at the beginning of the operation, or when the drill auxiliary tube 1 is removed after the operation, and during the operation, the extended part may cause damage to other tissues of the patient. Figure 1 In the example shown, the shape of the arc-shaped upper clamp 21 is consistent with the shape of the tube wall of the tube body 1, that is, the diameter of the outer arc surface is the same as the diameter of the outer wall surface of the tube body 1, the diameter of the inner arc surface is the same as the diameter of the inner wall surface of the tube body 1, and the centers of the two coincide; the arc length of the arc-shaped upper clamp 21 is about 5 / 8 of the entire tube wall. The longer the arc length is designed, the better the clamping stability.

[0071] To facilitate easier adjustment of the clamping mechanism 2 during surgery, the first adjustment mechanism 3 of this invention includes an adjustment rod 31 and an operating member 32. One end of the adjustment rod 31 is connected to the movable clamping part 201, and the other end of the adjustment rod 31 is connected to the operating member 32. When the operating member 32 is operated, the adjustment rod 31 drives the movable clamping part 201 to move. The tube body 1 is provided with a receiving position 13 for accommodating the adjustment rod 31, and the operating member 32 protrudes from the outer wall near the upper part of the tube body 1. Understandably, during surgery, the doctor's hand cannot be inserted into the patient's body to adjust the clamping mechanism 2. Therefore, the operating member 32 needs to be located in the upper part of the tube body 1. Since the upper part of the tube body 1 is exposed outside the patient's body, it is convenient for the doctor to control the clamping mechanism 2. In addition, in order to minimize the cross-sectional area of ​​the drill auxiliary sleeve and avoid the surgical channel being too large, the adjustment rod 31 is accommodated in the receiving position 13 of the tube body 1.

[0072] To prevent the adjusting rod 31 from detaching from the receiving position 13, a strip-shaped groove 313 can be provided on the adjusting rod 31. The length direction of the strip-shaped groove 313 is consistent with the length direction of the adjusting rod 31. Then, bolts are used to pass through the strip-shaped groove 313 and lock it to the pipe body 1. This can prevent the adjusting rod 31 from falling out of the receiving position 13, while ensuring that the adjusting rod 31 can still move up and down. The strip-shaped groove 313 can be provided on the front of the adjusting rod 31 or on both sides of the adjusting rod 31.

[0073] Understandably, the adjusting rod 31 only needs to be able to drive the movable clamping part 201 to move. The direction of movement of the movable clamping part 201 can be left-right (i.e., horizontal) or up-down. Therefore, the direction and specific structural style of the adjusting rod 31 can be designed according to specific design requirements. In some embodiments, especially when the direction of movement of the movable clamping part 201 is up-down, the adjusting rod 31 is a rod extending upward along the length direction of the tube body 1, and the receiving position 13 is recessed inward from the outer wall of the tube body 1. The adjusting rod 31 is movably fitted into the receiving position 13. At this time, the outer surface of the adjusting rod 31 is flush with the outer wall of the tube body 1 or slightly recessed into the outer wall, preferably flush with the outer wall.

[0074] To allow doctors to operate the control element 32 simply by using their fingers, the control element 32 can be a toggle button 44 or a knob 321 that manually controls the up and down movement of the adjustment lever 31. Alternatively, the control element 32 can be designed as an electric button that electrically controls the adjustment lever 31, in conjunction with a motor or other means to achieve electric control.

[0075] The first adjustment mechanism 3 of the present invention, after adjusting the movable clamping part 201, can either manually hold the operating member 32 to keep the clamping mechanism 2 in a clamping state, or automatically hold the operating member 32 by setting a structural linkage. This method can better free the doctor's fingers and increase attention to the fingers. In some embodiments, when the operating member 32 is designed as a manually controlled adjustment knob 321, the corresponding adjustment rod 31 is provided with a rack 312 at the upper part; and the operating member 32, in addition to the knob 321, also includes a gear 322 and a return spring 323, wherein the gear 322 meshes with the rack 312, and the knob 321 and the gear 322 are coaxially connected and fixed by a connecting post 324; correspondingly, the tube body 1 is provided with a mounting part 14, which protrudes from the outside of the tube body 1 and is located at... At the receiving position 13, the connecting post 324 passes through the mounting part 14, and the knob 321 and the gear 322 are located on the outer and inner sides of the mounting part 14, respectively. The knob 321 and the gear 322 can move relative to the mounting part 14 in the axial direction. Here, the axial direction refers to the direction of the axis around which the knob 321 rotates. The inner side of the mounting part 14 is provided with a gear cavity 15 that can accommodate part of the gear 322. The return spring 323 is connected at a position between the knob 321 and the outer side of the mounting part 14.

[0076] Understandably, the spring force of the return spring 323 keeps the knob 321 always in a direction that deviates radially outward from the tube body 1. At this time, a portion of the gear 322 will be embedded in the gear cavity 15 of the mounting part 14, such as... Figure 4 In the state shown, if the knob 321 is manually turned, it cannot be turned because the gear 322 is engaged with the gear cavity 15. Simultaneously, since part of the gear 322 is also engaged with the rack 312, the rack 312 cannot move up or down. This means the adjusting rod 31 is also fixed, and correspondingly, the movable clamping part 201 is also fixed, maintaining a clamping state. That is, the first adjusting mechanism 3 is in a locked, non-adjustable state. When it is necessary to adjust the movable clamping part 201, the knob 321 needs to be manually pressed towards the tube body 1 to overcome the spring force of the return spring 323, causing the gear 322 to disengage from the gear cavity 15. At this time, the first adjusting mechanism 3 is in an adjustable state, such as... Figure 3 In the state shown, rotating the knob 321 will drive the gear 322 to rotate, thereby moving the rack 312 up and down, thus realizing the movement adjustment of the movable clamping part 201. After the adjustment is completed, the knob 321 is released, and the knob 321 automatically moves outward under the elastic force of the return spring 323, thereby bringing the gear 322 into the gear cavity 15 for engagement. Therefore, the locking of the clamping mechanism 2 ensures that the clamping mechanism 2 can firmly clamp the bone during the operation, and there is no need to manually maintain the locking state, which further simplifies the operation.

[0077] To avoid the problem that the upper clamping part 21 might only clamp around the periphery of the ground bone when using the upper and lower clamping method, and that the upper clamping part 21 might tilt or deviate after the grinding drill 9 has ground the bone, resulting in an unstable clamping, in some embodiments, the upper clamping part 21 includes a fixed arc-shaped part 211 and a movable extension part 212. The movable extension part 212 is movably connected to the fixed arc-shaped part 211. When the movable extension part 212 is in a first state, it together with the fixed arc-shaped part 211 forms an arc-shaped strip-shaped upper clamping part 21. When the movable extension part 212 is in a second state, it extends laterally beyond the outer wall of the tube body 1. That is, in the second state, the movable extension part 212 will abut against the outer side of the bone part ground by the grinding head 92, away from the periphery ground by the grinding head 92. In this way, even if the fixed arc-shaped part 211 tilts or deviates, the entire upper clamping part 21 can be kept in a secure state, ensuring that the clamping of the entire clamping mechanism 2 is more stable.

[0078] Similarly, to facilitate doctors in adjusting the state of the movable extension 212, some embodiments also include a second adjustment mechanism 4, which is connected to the movable extension 212 to control the movable extension 212 to switch between a first state and a second state.

[0079] The switching method of the movable extension 212 can be linear extension from the position of the fixed arc-shaped part 211, rotation from the position of the fixed arc-shaped part 211, or other methods such as a combination of movement and rotation. In the linear extension method, the corresponding second adjustment mechanism 4 can use two wedge blocks to convert movement along the axis of the tube body 1 into movement of the movable extension 212 along the radial direction of the tube body 1. And in the case of... Figure 7In the example shown, the movable extension 212 includes a pair of rotating extension feet 2121; the second adjustment mechanism 4 includes a driving gear 41, a driven gear 42, a rotating shaft 43, and a toggle key 44. An output gear 2122 is fixedly provided on the rotating shaft of the corresponding rotating extension foot 2121. One end of the rotating shaft 43 is coaxially connected to the driving gear 41, and the other end of the rotating shaft 43 is fixedly connected to the toggle key 44. One side of the driven gear 42 meshes with one side of the driving gear 41. The output gear 2122 of one rotating extension foot 2121 meshes with the other side of the driving gear 41, and the output gear 2122 of the other rotating extension foot 2121 meshes with the other side of the driven gear 42. When the toggle key 44 is manually turned, the shaft 43 will rotate in the direction of the toggle, thereby driving the drive gear 41 to rotate. The drive gear 41 then drives the output gear 2122 meshing with it to rotate, thereby rotating the rotation extension foot 2121 out of the fixed arc-shaped part 211. At the same time, the rotation of the drive gear 41 will also drive the driven gear 42 to rotate, and the driven gear 42 then drives the output gear 2122 meshing with it to rotate, thereby rotating the other rotation extension foot 2121 out of the fixed arc-shaped part 211.

[0080] Understandably, there is no specific limitation on the angle at which the rotating extension foot 2121 rotates out, as long as it satisfies the requirement of being far from the grinding position in the second state. Similarly, there is no specific limitation on whether the rotation angles of the two rotating extension feet 2121 are the same; they can be the same or different. In... Figure 7 In the example shown, since the driving gear 41 and driven gear 42 are the same size, and the output gears 2122 of the two rotating extension feet 2121 are also the same size, the rotation angles of the two rotating extension feet 2121 are also the same. Moreover, through the design of the diameter ratio and tooth number ratio of the driving gear 41 and driven gear 42 to the two output gears 2122, the rotation angles of the two rotating extension feet 2121 are both 90°.

[0081] To further simplify operation, in some embodiments, the tube 1 is designed to include an upper tube 11 and a lower tube 12, wherein the clamping mechanism 2 is disposed on the lower tube 12. The lower end of the upper tube 11 and the upper end of the lower tube 12 are movably connected relative to each other along the axis, and the upper end of the upper tube 11 is fixedly connected to the handle 91 of the drill 9. Understandably, by fixing the upper tube 11 to the handle of the drill 9, the consistency of the drill auxiliary sleeve and the drill 9's swing is achieved. That is, when the doctor tilts or swings the drill 9 using the handle 91, the drill auxiliary sleeve also tilts or swings synchronously. Therefore, the doctor no longer needs to control the direction of the drill auxiliary sleeve, and even if the other hand does not hold the drill auxiliary sleeve, the grinding head 92 of the drill 9 will not be obstructed by the side wall of the drill auxiliary sleeve. However, generally for grinding... The process is more stable, and it is best to hold the drill auxiliary sleeve with the other hand. In addition, since the upper tube 11 can move downward relative to the lower tube 12, the upper tube 11 will not hinder the drill 9 from grinding the bone. The lower tube 12 will not move downward because it is clamped by the clamping mechanism 2. Therefore, when the drill 9 is moved downward by hand, it will only drive the upper tube 11 to move downward relative to the lower tube 12, without affecting the lower tube 12. Therefore, there is no need to worry that the lower tube 12 will move downward and compress or damage the nerve.

[0082] Furthermore, the relative movement distance between the upper tube 11 and the lower tube 12 can be achieved through the cooperation of the limiting groove 17 and the limiting protrusion 18, such as... Figure 9 In the example shown, a pair of limiting grooves 17 are provided on the upper part of the lower tube 12, and a pair of limiting protrusions 18 are provided on the lower part of the corresponding upper tube 11. After the limiting protrusions 18 are inserted into the limiting grooves 17, the limiting protrusions 18 can move up and down within the length range of the limiting grooves 17. The range of this up and down movement is the relative movement distance of the upper tube 11 relative to the lower tube 12. By setting the relative movement distance, the depth of the grinding head 92 can be further limited, which can better prevent the grinding head 92 from grinding too deeply and grinding the limiting part 5. In addition, a telescopic spring 6 can be provided at the connection between the upper tube 11 and the lower tube 12. The telescopic spring 6 can lift the upper tube 11 back to its original position after the downward pressure on the upper tube 11 is released.

[0083] The connection method between the upper tube body 11 and the handle part 91 of the drill 9 can be snap-fit, screw-fit, fasten, or insert, etc., and is not specifically limited. Figure 9In the example shown, the upper tube 11 is connected to the handle 91 via a sleeve clamping method. An elastic sleeve 19 is located at the upper end of the upper tube 11, and a locking ring 7 is located outside the sleeve. A compression spring 8 is fitted between the lower end of the locking ring 7 and the upper tube 11. The compression spring 8 keeps the locking ring 7 close to the elastic sleeve 19 to lock it in place. When connecting the upper tube 11 to the handle 91, the locking ring 7 is manually pulled down away from the elastic sleeve 19. This further compresses the compression spring 8, and the elastic sleeve 19 elastically expands outward, allowing the elastic sleeve 19 to be easily fitted onto the lower end of the handle 91. After fitting, the locking ring 7 is released, and it returns to its original position under the action of the compression spring 8, causing the elastic sleeve 19 to contract and clamp the handle 91. This achieves a fixed connection between the upper tube 11 and the handle 91, making both connection and disassembly convenient.

[0084] The following is a detailed description of specific embodiments.

[0085] Example 1:

[0086] like Figures 1-4 As shown, this embodiment includes a tube 1 into which a drill 9 extends. The tube 1 has a limiting portion 5 below its lower end, which extends into the patient's body, to prevent the drill 9 from grinding down the nerve beneath the bone. The tube 1 is a single, integral tube. This embodiment also includes a clamping mechanism 2 for clamping the bone to be ground, which is located at the lower end of the tube 1.

[0087] The clamping mechanism 2 in this embodiment includes two clamping parts: an upper clamping part 21 and a lower clamping part 22. The upper clamping part 21 is a movable clamping part 201, and the lower clamping part 22 is a fixed clamping part 202. The lower clamping part 22 also constitutes the limiting part 5. The upper clamping part 21 can be moved up and down between a first position and a second position by the first adjusting mechanism 3. The first position is the position where the upper end face of the upper clamping part 21 is in contact with the lower end face of the tube body 1, and the second position is the position where the lower end face of the upper clamping part 21 is in contact with the upper end face of the lower clamping part 22.

[0088] like Figure 2 As shown, the upper clamp 21 is an arc-shaped strip upper clamp 21, and its shape is consistent with the shape of the pipe wall of the pipe body 1. That is, the diameter of the outer arc surface is the same as the diameter of the outer wall surface of the pipe body 1, the diameter of the inner arc surface is the same as the diameter of the inner wall surface of the pipe body 1, and the centers of the two coincide; and the arc length of the arc-shaped strip upper clamp 21 is approximately 5 / 8 of the entire pipe wall.

[0089] like Figure 2As shown, the first adjustment mechanism 3 of this embodiment includes an adjustment rod 31 and an operating member 32. The adjustment rod 31 is a rod extending upward along the length direction of the tube body 1. The lower end of the adjustment rod 31 is integrally formed with the upper clamping part 21, and the upper end of the adjustment rod 31 extends to a position close to the upper end of the tube body 1. A receiving position 13 is provided on the tube body 1 for accommodating the adjustment rod 31. In this embodiment, the receiving position 13 is recessed from the outer wall of the tube body 1. The shape and width of the receiving position 13 are the same as those of the adjustment rod 31. The adjustment rod 31 is movably fitted into the receiving position 13, and after being fitted, the outer surface of the adjustment rod 31 is flush with the outer wall of the tube body 1. In this embodiment, an inwardly recessed recess 311 is provided on the upper front of the adjusting rod 31. The width of the recess 311 is smaller than the width of the adjusting rod 31, thus forming two side walls for the recess 311. A rack 312 is provided on one of the side walls. The operating component 32 in this embodiment includes a knob 321, a gear 322, and a return spring 323. The gear 322 meshes with the rack 312, and the knob 321 and the gear 322 are coaxially connected and fixed by a connecting post 324. Correspondingly, the tube body 1 is provided with Mounting part 14 protrudes from the outside of tube body 1 and is located at receiving position 13. Connecting post 324 passes through mounting part 14 and positions knob 321 and gear 322 on the outside and inside of mounting part 14 respectively. Knob 321 and gear 322 can move relative to mounting part 14 in the axial direction. The inside of mounting part 14 is provided with gear cavity 15 that can accommodate part of gear 322. Return spring 323 is connected between knob 321 and the outside of mounting part 14.

[0090] When the first adjustment mechanism 3 needs to be adjusted, the doctor needs to manually press the knob 321 towards the tube body 1 to overcome the elastic force of the return spring 323, causing the gear 322 to disengage from the gear cavity 15. At this time, the first adjustment mechanism 3 is in an adjustable state. Figure 3 In the state shown, rotating knob 321 will drive gear 322 to rotate, thereby moving rack 312 up and down, thus adjusting the movement of movable clamping part 201. After adjustment, releasing knob 321 will cause it to automatically move radially outward from tube 1 under the force of return spring 323, thereby moving gear 322 outward and embedding it into gear cavity 15. Figure 4In the state shown, if the knob 321 is manually turned, it cannot be turned because the gear 322 is engaged with the gear cavity 15. At the same time, since part of the gear 322 is also engaged with the rack 312, the rack 312 cannot move up or down. This means that the adjusting rod 31 is also fixed, and the corresponding clamping part 21 is also fixed. The entire clamping mechanism 2 remains in a clamping state, ensuring that the clamping mechanism 2 can firmly clamp the bone during the operation. Moreover, there is no need to manually maintain the locking state, which further simplifies the operation.

[0091] A strip groove 313 is provided on the other side wall of the recess 311. The length direction of the strip groove 313 is consistent with the length direction of the adjusting rod 31. Then, the adjusting rod 31 is locked to the pipe body 1 through the strip groove 313 by bolts (not shown in the figure). Therefore, the adjusting rod 31 will not fall out of the receiving position 13, and the adjusting rod 31 can also move up and down.

[0092] In this embodiment, the clamping mechanism 2 fixes the drill auxiliary sleeve to the bone to be ground. This way, the doctor only needs to control the direction of the drill auxiliary sleeve and does not need to worry about the drill auxiliary sleeve accidentally deviating from the position of the bone when grinding the bone. It also prevents the drill auxiliary sleeve from accidentally moving downwards with the drill 9 and compressing or damaging the nerves. Therefore, the difficulty of the operation is greatly reduced, the operation is simpler, the doctor can focus more on the grinding of the drill 9, and the requirements for the doctor's experience level are not very high.

[0093] Example 2:

[0094] like Figures 5-7 As shown, this embodiment includes a tube 1 into which a drill 9 extends. The tube 1 has a limiting portion 5 below its lower end, which extends into the patient's body, to prevent the drill 9 from grinding down the nerve beneath the bone. The tube 1 is a single, integral tube. This embodiment also includes a clamping mechanism 2 for clamping the bone to be ground, which is located at the lower end of the tube 1.

[0095] The clamping mechanism 2 in this embodiment includes two clamping parts: an upper clamping part 21 and a lower clamping part 22. The upper clamping part 21 is a movable clamping part 201, and the lower clamping part 22 is a fixed clamping part 202, and the lower clamping part 22 constitutes a limiting part 5. The upper clamping part 21 can be moved up and down between a first position and a second position by the first adjusting mechanism 3. The first position is the position where the upper end face of the upper clamping part 21 is in contact with the lower end face of the tube body 1, and the second position is the position where the lower end face of the upper clamping part 21 is in contact with the upper end face of the lower clamping part 22.

[0096] The structure of the first adjustment mechanism 3 used to control the up-and-down movement of the upper clamp 21 in this embodiment is exactly the same as that in Embodiment 1, so it will not be described again.

[0097] Unlike Embodiment 1, the upper clamping portion 21 in this embodiment includes a fixed arc-shaped portion 211 and a movable extension portion 212, and also includes a second adjustment mechanism 4. The second adjustment mechanism 4 is connected to the movable extension portion 212 to control the switching of the movable extension portion 212 between a first state and a second state. The shape of the fixed arc-shaped portion 211 is consistent with the shape of the tube wall of the tube body 1; that is, the diameter of the outer arc-shaped surface is the same as the diameter of the outer wall surface of the tube body 1, and the diameter of the inner arc-shaped surface is the same as the diameter of the inner wall surface of the tube body 1, and their centers coincide. Furthermore, the arc length of the fixed arc-shaped portion 211 is approximately 5 / 8 of the entire circumference of the tube wall. In this embodiment, the movable extension portion 212 is movably connected to the fixed arc-shaped portion 211, such as... Figure 6 As shown, the movable extension 212 includes a pair of rotating extension feet 2121. The arc radius of these rotating extension feet 2121 is the same as that of the fixed arc portion 211, and their thickness is less than half the thickness of the fixed arc portion 211. Half the thickness of the lower end face of the fixed arc portion 211 is removed, and these rotating extension feet are installed at the removed portion. Therefore, when the movable extension 212 is in the first state, it together with the fixed arc portion 211 forms an arc-shaped upper clamping portion 21. When the movable extension 212 is in the second state, it rotates laterally outward to the outer wall of the tube body 1. The rotating shaft portions of these rotating extension feet 2121 are close to each other and located in the middle of the removed portion. An output gear 2122 is fixedly mounted on the rotating shaft of the rotating extension feet 2121.

[0098] Correspondingly, such as Figure 7 As shown, the second adjustment mechanism 4 in this embodiment includes a driving gear 41, a driven gear 42, a rotating shaft 43, and a toggle key 44. A gearbox position 2111 is provided in the middle of the cut-out portion of the fixed arc-shaped part 211. The driving gear 41 and the driven gear 42 are both installed in the gearbox position 2111. Similarly, the output gear 2122 on the rotating extension foot 2121 is also installed in the gearbox position 2111. The opening end of the gearbox position 2111 is covered by the gearbox cover 2112 and locked in place, thereby preventing each gear 322 from falling out of the gearbox position 2111 and also limiting the two rotating extension feet 2121 from falling down.

[0099] In this embodiment, one end of the rotating shaft 43 is coaxially connected to the drive gear 41, and the other end of the rotating shaft 43 is fixedly connected to the toggle key 44. Similarly, to facilitate control of the toggle key 44, the toggle key 44 is also located near the upper part of the tube body 1. Therefore, the rotating shaft 43 needs to extend from the gearbox position 2111 all the way to the upper part of the tube body 1. Specifically, in this embodiment, a through hole 314 is provided on the adjusting rod 31, and the rotating shaft 43 extends upwards from this through hole 314, extending all the way to the recess. Position 311 is located below the knob 321, that is, the toggle key 44 is installed below the knob 321. The toggle key 44 and the knob 321 share the mounting part 14. The mounting part 14 is provided with a toggle groove 16. The inner end of the toggle key 44 is fixedly sleeved with the rotating shaft 43. The outer end of the toggle key 44 extends out of the tube body 1 from the toggle groove 16 so that it can be toggleed. When the toggle key 44 is toggled from one end of the toggle groove 16 to the other end, it can drive the drive gear 41 to rotate.

[0100] In this embodiment, one side of the driven gear 42 meshes with one side of the driving gear 41, one of the output gears 2122 of the rotating extension foot 2121 meshes with the other side of the driving gear 41, and the other output gear 2122 of the rotating extension foot 2121 meshes with the other side of the driven gear 42.

[0101] When the drill-assisted cannula is about to enter the patient's body, the rotating extension foot 2121 should be kept in the first state. This ensures that the clamping mechanism 2 will not damage the surrounding tissues of the surgical channel during the insertion of the drill-assisted cannula. When the drill-assisted cannula reaches the required position and the clamping mechanism 2 has completed clamping the bone to be ground, the rotating extension foot 2121 can be rotated to the second state. The specific operation is as follows: manually move the toggle key 44 from one end of the toggle slot 16 to the other end. The rotating shaft 43 will rotate in the direction of the toggle, thereby driving the drive gear 41 to rotate. The drive gear 41 then drives the output gear 2122 meshing with it to rotate, thereby rotating the rotating extension foot 2121 containing the output gear 2122 out of the fixed arc part 211. At the same time, the rotation of the drive gear 41 will also drive the driven gear 42 to rotate, and the driven gear 42 then drives the output gear 2122 meshing with it to rotate, thereby rotating the other rotating extension foot 2121 out of the fixed arc part 211. At this point, the pair of rotating extension feet 2121 are in the second state, as follows: Figure 5As shown, in this state, the rotating extension foot 2121 rests against the outer side of the bone area being ground by the grinding head 92, away from the periphery of the grinding head 92. This ensures that even if the fixed arc-shaped part 211 tilts or deviates, the entire upper clamping part 21 remains firmly in place, guaranteeing a more stable clamping mechanism 2. After the complete grinding surgery, before removing the grinding drill auxiliary sleeve, the rotating extension foot 2121 needs to be rotated back to the first state. This is achieved by reverse-shifting the toggle key 44. This prevents the clamping mechanism 2 from scratching other tissues of the patient during the removal of the grinding drill auxiliary sleeve.

[0102] In this embodiment, the clamping mechanism 2 fixes the drill auxiliary sleeve to the bone to be ground. The clamping range is large and the clamping is more stable. In this way, the doctor only needs to control the direction of the drill auxiliary sleeve. There is no need to worry that the drill auxiliary sleeve will accidentally deviate from the position of the bone when grinding the bone. Nor will the drill auxiliary sleeve be accidentally moved downwards while the drill 9 is grinding, which may compress and damage the nerves. Therefore, the difficulty of the operation is greatly reduced and the operation is simpler. The doctor can focus more on the grinding of the drill 9 and the skill level required of the doctor is not very high.

[0103] Example 3:

[0104] like Figures 8-10 As shown, this embodiment includes a tube 1 into which a drill 9 extends. The tube 1 has a limiting portion 5 below its lower end, which extends into the patient's body, to prevent the drill 9 from grinding down the nerve beneath the bone. This embodiment also includes a clamping mechanism 2 for clamping the bone to be ground, which is located at the lower end of the tube 1.

[0105] The clamping mechanism 2 in this embodiment includes two clamping parts: an upper clamping part 21 and a lower clamping part 22. The upper clamping part 21 is a movable clamping part 201, and the lower clamping part 22 is a fixed clamping part 202, and the lower clamping part 22 constitutes a limiting part 5. The upper clamping part 21 can be moved up and down between a first position and a second position by the first adjusting mechanism 3. The first position is the position where the upper end face of the upper clamping part 21 is in contact with the lower end face of the tube body 1, and the second position is the position where the lower end face of the upper clamping part 21 is in contact with the upper end face of the lower clamping part 22.

[0106] The structure of the first adjustment mechanism 3 used to control the up-and-down movement of the upper clamp 21 in this embodiment is exactly the same as that in Embodiment 1, so it will not be described again.

[0107] The upper clamping part 21 of this embodiment includes a fixed arc-shaped part 211 and a movable extension part 212, and also includes a second adjustment mechanism 4. The structure of the upper clamping part 21 and the second adjustment mechanism 4 is exactly the same as that of Embodiment 2, so it will not be described again.

[0108] Unlike Embodiments 1 and 2, the tube 1 in this embodiment includes an upper tube 11 and a lower tube 12, wherein the clamping mechanism 2, the first adjusting mechanism 3, and the second adjusting mechanism 4 are all disposed on the lower tube 12; the lower end of the upper tube 11 and the upper end of the lower tube 12 are movably connected relative to each other along the axis, and the upper end of the upper tube 11 is fixedly connected to the handle 91 of the drill 9, thus achieving consistency between the drill auxiliary sleeve and the swing of the drill 9, that is, when the doctor drives the drill 9 to tilt or swing by the handle 91 of the drill 9. At the same time, the drill auxiliary cannula also tilts or swings synchronously, so the doctor no longer needs to control the direction of the drill auxiliary cannula; and since the upper tube 11 can move downward relative to the lower tube 12, the upper tube 11 will not hinder the drill 9 from grinding bone downward. The lower tube 12 will not move downward because it is clamped by the clamping mechanism 2. Therefore, when the drill 9 is moved downward by hand, it will only drive the upper tube 11 to move downward relative to the lower tube 12, without affecting the lower tube 12. Therefore, there is no need to worry that the lower tube 12 will move downward and compress or damage the nerve.

[0109] like Figure 9 As shown, in this embodiment, a pair of limiting grooves 17 are provided on the upper part of the lower tube body 12, and a pair of limiting protrusions 18 are provided on the lower part of the corresponding upper tube body 11. After the limiting protrusions 18 are inserted into the limiting grooves 17, the limiting protrusions 18 can move up and down within the length range of the limiting grooves 17, that is, the relative movement distance of the upper tube body 11 relative to the lower tube body 12. By setting the relative movement distance, the depth of the grinding head 92 can be further limited, which can better prevent the grinding head 92 from grinding too deeply and damaging the limiting part 5. In addition, in this embodiment, a telescopic spring 6 is provided at the connection between the upper tube body 11 and the lower tube body 12. Through this telescopic spring 6, after the downward pressure on the upper tube body 11 is released, the telescopic spring 6 can lift the upper tube body 11 upward and reset it.

[0110] In this embodiment, the upper tube 11 and the handle 91 are connected by a sleeve clamping method. An elastic sleeve interface 19 is provided at the upper end of the upper tube 11, and a locking ring 7 is provided outside the sleeve interface. A compression spring 8 is sleeved between the lower end of the locking ring 7 and the upper tube 11. The compression spring 8 keeps the locking ring 7 close to the elastic sleeve interface 19 to lock it. When it is necessary to connect the upper tube 11 and the handle 91, the locking ring 7 needs to be manually pulled down away from the elastic sleeve interface 19. At this time, the compression spring 8 is further compressed, and the elastic sleeve interface 19 can be elastically opened outwards. This allows the elastic sleeve interface 19 to be easily sleeved onto the lower end of the handle 91. After sleeved, the locking ring 7 is released, and the locking ring 7 returns to its original position under the action of the compression spring 8, causing the elastic sleeve interface 19 to contract and clamp the handle 91. Figure 10 As shown. This connection method is not only easy to connect, but also easy to disassemble.

[0111] In the description of this specification, references to terms such as "embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0112] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A depth-limiting spinal drill auxiliary cannula, comprising a tube for the drill to extend into, wherein the tube has a limiting portion below its lower end inserted into the patient's body to prevent the drill from grinding down to nerves beneath the bone, characterized in that, It also includes a clamping mechanism for clamping the bone to be ground, the clamping mechanism being located at the lower end of the tube body, the clamping mechanism including at least two clamping parts, at least one of which is a movable clamping part, the movable clamping part being adjusted relative to the other clamping parts by a first adjusting mechanism, the limiting part being fixedly connected to the fixed clamping part or to the lower end face of the tube body; The clamping mechanism includes an upper clamping part and a lower clamping part. The upper clamping part includes a fixed arc-shaped part and a movable extension part. The movable extension part is movably connected to the fixed arc-shaped part. When the movable extension part is in a first state, it together with the fixed arc-shaped part forms an arc-shaped strip upper clamping part. When the movable extension part is in a second state, it extends laterally to the outer wall of the tube.

2. The depth-limited spinal drill auxiliary sleeve according to claim 1, characterized in that, The clamping mechanism includes two clamping parts: an upper clamping part and a lower clamping part. The upper clamping part is a movable clamping part and has a first position and a second position. The first position is the position where the upper end face of the upper clamping part meets the lower end face of the tube body, and the second position is the position where the lower end face of the upper clamping part meets the upper end face of the lower clamping part. The first adjusting mechanism controls the upper clamping part to move up and down between the first position and the second position. The lower clamping part constitutes the limiting part.

3. The depth-limited spinal drill auxiliary sleeve according to claim 2, characterized in that, The upper clamp is an arc-shaped strip upper clamp, the outer arc surface of which does not extend beyond the outer wall surface of the tube body, and the inner arc surface of which does not extend beyond the inner wall surface of the tube body.

4. The depth-limited spinal drill auxiliary sleeve according to claim 1, characterized in that, The first adjustment mechanism includes an adjustment rod and an operating member. One end of the adjustment rod is connected to the movable clamping part, and the other end of the adjustment rod is connected to the operating member. When the operating member is operated, the adjustment rod drives the movable clamping part to move. The tube body is provided with a receiving position for accommodating the adjustment rod, and the operating member protrudes from the outer wall near the upper part of the tube body.

5. The depth-limited spinal drill auxiliary sleeve according to claim 4, characterized in that, The adjusting rod is a rod extending upward along the length of the tube body, and the receiving position is formed by recessing from the outer wall of the tube body. The adjusting rod is movably fitted into the receiving position. The operating component is a toggle key or knob for manually controlling the up and down movement of the adjusting rod.

6. The depth-limited spinal drill auxiliary sleeve according to claim 5, characterized in that, The adjusting rod has a rack at its upper part; the operating component includes a knob, a gear, and a return spring. The gear meshes with the rack, and the knob and the gear are coaxially connected and fixed by a connecting post; the tube body has a mounting part, and the connecting post passes through the mounting part so that the knob and the gear are located on the outer and inner sides of the mounting part, respectively, and the knob and the gear can move relative to the mounting part in the axial direction. The inner side of the mounting part has a gear cavity that can accommodate part of the gear, and the return spring is connected between the knob and the outer side of the mounting part.

7. The depth-limited spinal drill auxiliary sleeve according to claim 1, characterized in that, It also includes a second adjustment mechanism, which is connected to the movable extension to control the movable extension to switch between the first state and the second state.

8. The depth-limited spinal drill auxiliary sleeve according to claim 7, characterized in that, The movable extension includes a pair of rotating extension feet; the second adjustment mechanism includes a driving gear, a driven gear, a rotating shaft, and a toggle key. An output gear is fixedly provided on the rotating shaft of the corresponding rotating extension foot. One end of the rotating shaft is coaxially connected to the driving gear, and the other end of the rotating shaft is fixedly connected to the toggle key. One side of the driven gear meshes with one side of the driving gear. The output gear of one rotating extension foot meshes with the other side of the driving gear, and the output gear of the other rotating extension foot meshes with the other side of the driven gear.

9. The depth-limited spinal drill auxiliary sleeve according to claim 1, characterized in that, The tube body includes an upper tube body and a lower tube body. The clamping mechanism is disposed on the lower tube body. The lower end of the upper tube body and the upper end of the lower tube body are movably connected relative to each other along the axis. The upper end of the upper tube body is fixedly connected to the handle of the grinding drill.

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