Depth-limiting spine abrasive drill auxiliary sleeve

Abstract

The invention provides a depth-limited spine abrasive drill auxiliary sleeve which comprises a pipe body allowing an abrasive drill to stretch in, a limiting part arranged below the pipe body and a clamping mechanism used for clamping bone substances to be ground, the clamping mechanism is arranged at the lower end of the pipe body and comprises at least two clamping parts, at least one clamping part is a movable clamping part, and the limiting part is arranged on the lower portion of the pipe body. And the movable clamping part is moved and adjusted relative to the other clamping parts through the first adjusting mechanism. Therefore, a doctor only needs to control the direction of the auxiliary casing pipe of the abrasive drill and does not need to worry that the auxiliary casing pipe of the abrasive drill is carelessly deviated from the position of the bone when the bone is ground. And the situation that nerves are pressed and damaged due to the fact that the abrasive drill auxiliary sleeve is accidentally driven to move downwards when the abrasive drill grinds downwards is avoided, so that the difficulty of an operation is greatly reduced, the operation is simpler, a doctor can concentrate on grinding of the abrasive drill, and the requirement for the experience level of the doctor is not very high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical auxiliary equipment, and particularly relates to a depth-limited spinal drill auxiliary sleeve. BACKGROUND

[0002] Spinal endoscopic surgery is the most commonly used minimally invasive method for treating spinal degenerative diseases. In such surgery, a drill bit is generally used, such as a drill bit used to remove part of the bony structure to expose the proliferative yellow ligament and protruding intervertebral disc.

[0003] At present, when the drill bit is used, a drill bit sleeve is generally first placed in the tissue to be ground, and then the drill bit is inserted into the drill bit sleeve to grind the bony tissue. Further, in order to prevent the drill bit from grinding excessively and damaging the nerve, a limiting portion is arranged below the drill bit sleeve, which is arranged between the nerve and the bony tissue to limit the drill bit from grinding excessively downward to the nerve.

[0004] However, the existing drill bit sleeve does not have a clamping device, and only the limiting portion is used to block the nerve in the deep lamina, so that during the operation, the drill bit sleeve is prone to displacement, thereby causing the drill bit to grind at a position other than the position where the bony tissue is to be removed, or the nerve to be pressed and damaged. Therefore, during the operation, the doctor not only needs to control the drill bit, but also needs to control the position of the drill bit sleeve, which is difficult to operate and requires very high experience and level of the doctor.

[0005] Therefore, it is necessary to develop a depth-limited spinal drill auxiliary sleeve. SUMMARY

[0006] The present application aims to solve the above problems and deficiencies, and provides a depth-limited spinal drill auxiliary sleeve to effectively solve the problems of the existing drill bit sleeve, such as easy deviation from the grinding position or compression and damage to the nerve, and large operation difficulty.

[0007] The technical scheme of the present application is as follows: The depth-limited spinal drill auxiliary sleeve comprises a pipe body for the drill bit to extend into, and a limiting portion arranged below the lower end of the pipe body for preventing the drill bit from grinding to the nerve below the bony tissue, characterized in that a clamping mechanism for clamping the bony tissue to be ground is further arranged, the clamping mechanism is arranged at the lower end of the pipe body, the clamping mechanism comprises at least two clamping portions, at least one of which is a movable clamping portion, the movable clamping portion is adjusted to move relative to the other clamping portions by a first adjusting mechanism, and the limiting portion is fixedly connected with the fixed clamping portion or the lower end surface of the pipe body.

[0008] In some embodiments, the clamping mechanism comprises two clamping parts, an upper clamping part and a lower clamping part, wherein the upper clamping part is a movable clamping part, the upper clamping part has a first position and a second position, the first position is the position where the upper end surface of the upper clamping part meets the lower end surface of the pipe body, the second position is the position where the lower end surface of the upper clamping part meets the upper end surface 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, and the lower clamping part constitutes the limiting part.

[0009] In some embodiments, the upper clamping part is an arc-shaped strip-shaped upper clamping part, the outer arc-shaped surface of the arc-shaped strip-shaped upper clamping part does not exceed the outer wall surface of the pipe body, and the inner arc-shaped surface of the arc-shaped strip-shaped upper clamping part does not exceed the inner wall surface of the pipe body.

[0010] In some embodiments, the first adjusting mechanism comprises an adjusting rod and an operating part, one end of the adjusting rod is connected with the movable clamping part, the other end of the adjusting rod is connected with the operating part, and the operating part is operated to drive the adjusting rod to move the movable clamping part; the pipe body is provided with a containing position for containing the adjusting rod, and the operating part is protruded on the outer wall near the upper part of the pipe body.

[0011] Further, the adjusting rod is a rod body extending upward along the length direction of the pipe body, the containing position is recessed inward from the outer wall of the pipe body, and the adjusting rod is movably embedded in the containing position; the operating part is a push key or a knob for manually controlling the adjusting rod to move up and down.

[0012] Still further, the adjusting rod is provided with a rack at the upper part, the operating part comprises a knob, a gear and a return spring, the gear is engaged with the rack, the knob is coaxially connected and fixed with the gear through a connecting column, the pipe body is provided with a mounting part, the connecting column passes through the mounting part so that the knob and the gear are respectively located on the outer side and the inner side of the mounting part, the knob and the gear can move in the axial direction relative to the mounting part, the inner side of the mounting part is provided with a gear recess capable of containing part of the gear, and the return spring is connected between the knob and the outer side of the mounting part.

[0013] In some embodiments, the upper clamping part comprises a fixed arc-shaped part and a movable extension part, the movable extension part is movably connected with the fixed arc-shaped part, the movable extension part and the fixed arc-shaped part jointly constitute an arc-shaped strip-shaped upper clamping part when the movable extension part is in a first state, and the movable extension part extends transversely out of the outer wall of the pipe body when the movable extension part is in a second state.

[0014] Further, a second adjusting mechanism is further included, which is connected with the movable extension part to control switching of the movable extension part between the first state and the second state.

[0015] Specifically, the movable extension part includes a pair of rotating extension legs; the second adjusting mechanism includes a driving gear, a driven gear, a rotating shaft and a knob, the rotating shaft is coaxially connected with the driving gear at one end, and the rotating shaft is fixedly connected with the knob at the other end, one side of the driven gear is engaged with one side of the driving gear, and the output gear of one rotating extension leg is engaged with the other side of the driving gear, and the output gear of the other rotating extension leg is engaged with the other side of the driven gear.

[0016] In some embodiments, the pipe body includes an upper pipe body and a lower pipe body, the clamping mechanism is arranged on the lower pipe body, the lower end of the upper pipe body is movably connected with the upper end of the lower pipe body along the axis, and the upper end of the upper pipe body is fixedly connected with the handle part of the burr.

[0017] The present application has the following advantages: 1. The clamping mechanism is arranged on the burr auxiliary sleeve, so that the burr auxiliary sleeve can be fixed on the bone to be ground, and the doctor only needs to control the direction of the burr auxiliary sleeve, without worrying that the burr auxiliary sleeve deviates from the position of the bone during grinding, and the doctor can more focused on grinding the burr, and the experience level of the doctor is not high.

[0018] 2. The movable clamping part of the clamping mechanism is moved and adjusted through the adjusting mechanism, so that the clamping mechanism of the burr auxiliary sleeve can clamp bones of different thicknesses and sizes, has higher applicability, and the clamping is more firm, effectively ensuring the safety of grinding.

[0019] 3. The movable extension part of the upper clamping part can be rotated outside the outer wall of the pipe body, so that the clamping range of the upper clamping part can be increased, part of the clamping part of the upper clamping part is away from the periphery of the bone to be ground, so that the clamping of the upper clamping part is more stable, and the probability problem of unstable clamping after grinding the bone by the burr due to clamping only on the periphery of the bone to be ground can be effectively avoided.

[0020] 4、Since the drill auxiliary sleeve is designed as two parts of the upper tube body and the lower tube body, and the upper tube body is fixedly connected with the drill handle part, and the lower end of the upper tube body is movably connected with the lower tube body along the axis, the operation can be further simplified, and the doctor does not need to control the direction of the drill auxiliary sleeve again, because the drill auxiliary sleeve is used synchronously with the drill to swing, and the problem that the drill head of the drill is hindered by the sidewall of the drill auxiliary sleeve does not occur.

[0021] The application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the drill auxiliary sleeve of the first embodiment of the application; Figure 2 It is a schematic diagram of the exploded structure of the drill auxiliary sleeve; Figure 1 Figure 3 It is a schematic diagram of the local structure of the first adjusting mechanism in the adjustable state of the application; Figure 4 It is a schematic diagram of the local structure of the first adjusting mechanism in the non-adjustable state of the application; Figure 5 It is a schematic diagram of the three-dimensional structure of the drill auxiliary sleeve of the second embodiment of the application; Figure 6 It is a schematic diagram of the exploded structure of the upper clamping part of the application; Figure 7 It is a schematic diagram of the three-dimensional structure of the second adjusting mechanism of the application; Figure 8 It is a schematic diagram of the three-dimensional structure of the drill auxiliary sleeve of the third embodiment of the application; Figure 9 It is a schematic diagram of the exploded structure of the drill auxiliary sleeve; Figure 8 Figure 10 It is a schematic diagram of the three-dimensional structure of the drill auxiliary sleeve and the drill used in cooperation.

[0023] Reference signs: Tube body 1; Upper tube body 11, lower tube body 12, accommodating position 13, mounting part 14, gear recess 15, pushing groove 16, limiting groove 17, limiting protrusion 18, elastic sleeve interface 19; Clamping mechanism 2; Upper clamping part 21; Fixed arc-shaped part 211; Gearbox position 2111, gearbox cover 2112; Movable extension part 212; Rotating extension foot 2121, output gear 2122; Lower clamping part 22, movable clamping part 201, fixed clamping part 202;​​ first adjusting mechanism 3; adjusting rod 31; concave position 311, rack 312, strip-shaped groove 313, through hole 314; operation piece 32; knob 321, gear 322, return spring 323, connecting column 324; second adjusting mechanism 4; driving gear 41, driven gear 42, rotating shaft 43, push key 44; limiting part 5; expansion spring 6; locking ring 7; compression spring 8; grinding drill 9; handle part 91, grinding head 92. DETAILED DESCRIPTION

[0024] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which the same or similar elements or elements having the same or similar functions are denoted by the same or similar reference numerals throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended only for the purpose of explaining the present application, and should not be understood as limiting the present application.

[0025] In the description of the present application, it should be understood that the terms "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as limiting the present application. In addition, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features, which are used to distinguish the described features, and have no order or importance.

[0026] In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0027] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "fit", "connect", "connect", "mount" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] The depth-limited spinal burr drill auxiliary cannula of the present application will be described below in conjunction with the accompanying drawings.

[0029] The present application relates to a depth-limited spinal burr drill auxiliary cannula, which comprises a tube body 1 for the burr drill 9 to extend into, and a limiting part 5 is arranged below the lower end of the tube body 1 for preventing the burr drill 9 from grinding below the nerves, characterized in that it further comprises a clamping mechanism 2 for clamping the bone to be ground, which is arranged at the lower end of the tube body 1, so that the burr drill auxiliary cannula can be fixed on the bone to be ground through the clamping mechanism 2, and the doctor only needs to control the direction of the burr drill auxiliary cannula, without worrying that the burr drill auxiliary cannula will deviate from the position of the bone during grinding, or that the burr drill 9 will inadvertently move downward with the burr drill auxiliary cannula while grinding, thereby compressing and damaging the nerves, so that the difficulty of the operation is greatly reduced, the operation is simpler, and the doctor can focus more on the grinding of the burr drill 9, and the experience level required for the doctor is not very high.

[0030] The clamping mechanism 2 of the present application comprises at least two clamping parts, at least one of which is a movable clamping part 201, which is adjusted to move relative to the other clamping parts through a first adjusting mechanism 3. Therefore, the clamping mechanism 2 of the burr drill auxiliary cannula can clamp bones of different thicknesses and sizes, has stronger applicability, and the clamping is more secure, effectively ensuring the safety of grinding.

[0031] It can be understood that the clamping mechanism 2 of the present application can comprise two clamping parts, three clamping parts, or four clamping parts, and more clamping parts.

[0032] Moreover, the clamping direction of the clamping part is not limited. It can be to clamp the two sides of the bone laterally, and such a clamping mechanism 2 can have two clamping parts, one on the left and one on the right, to clamp the bone, i.e., the direction of the clamping force is transverse to the axis direction of the tube body 1; it can also have three clamping parts to clamp the bone from three directions of left, right, and top; it can also have four clamping parts, two on the left and two on the right, to clamp the two sides of the bone. It can also clamp the upper and lower ends of the bone from the top and bottom directions, such as the examples shown in Figure 1 or Figure 5 .

[0033] It can also be understood that only one clamping part on the clamping mechanism 2 can be a movable clamping part 201, such as when the clamping mechanism 2 has two clamping parts, only one of which needs to be movable to achieve clamping adjustment. Of course, both clamping parts can be movable and adjustable. When the clamping mechanism 2 comprises more clamping parts, more clamping parts can be movable clamping parts 201.

[0034] The limiting part 5 of the present application can be fixedly connected with the fixed clamping part 202, or can be fixedly connected with the lower end surface of the pipe body 1. For example, when 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 pipe body 1, the limiting part 5 can be fixedly connected with the fixed clamping part 202, and at this time the fixed clamping part 202 serves as a connecting piece connected between the pipe body 1 and the limiting part 5. For another example, when all the clamping parts of the clamping mechanism 2 are movable clamping parts 201, the limiting part 5 can be fixedly connected with the lower end surface of the pipe body 1 through another connecting piece.

[0035] In the example shown in FIG. 1, 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. In this design, the lower clamping part 22 can constitute the limiting part 5, thereby reducing the structural complexity of the clamping mechanism 2, making the structure of the drill bit grinding auxiliary pipe more simple and practical, and reducing the failure rate. Figure 1 The upper clamping part 21 of this example has a first position and a second position. The first position is the position where the upper end surface of the upper clamping part 21 meets the lower end surface of the pipe body 1, and the second position is the position where the lower end surface of the upper clamping part 21 meets the upper end surface 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 position and the second position. In this design, the clamping range of the clamping mechanism 2 can be maximized. Of course, it is also possible to set the first position of the upper clamping part 21 at a position spaced apart from the lower end surface of the pipe body 1 by a certain distance, and similarly the second position of the upper clamping part 21 can also be set at a position spaced apart from the upper end surface of the lower clamping part 22 by a certain distance.

[0036] In order to avoid the upper clamping part 21 interfering with the grinding head 92 of the drill bit 9 extending out of the lower end surface of the pipe body 1 to perform grinding, in some embodiments, the upper clamping part 21 is an arc-shaped strip-shaped upper clamping part 21, the outer arc surface of the arc-shaped strip-shaped upper clamping part 21 does not exceed the outer wall surface of the pipe body 1, and the inner arc surface of the arc-shaped strip-shaped upper clamping part 21 does not exceed the inner wall surface of the pipe body 1. Of course, the above design is a relatively optimal solution. In other embodiments, the outer arc surface of the arc-shaped strip-shaped upper clamping part 21 can be allowed to exceed the outer wall surface of the pipe body 1. This has the advantage of increasing the contact area of the upper clamping part 21 with the bone, effectively avoiding the problem that the upper clamping part 21 may not be firmly contacted after the bone is ground by the grinding head 92. However, the disadvantage is that the part exceeding the outer wall surface of the pipe body 1 cannot be retracted, so it is possible to cause damage to other tissue parts of the patient when the drill bit grinding auxiliary pipe body 1 is initially put in or taken out after the operation, and during the operation.

[0037] Figure 1 ​In the shown example, the arc-shaped strip-shaped upper clamping part 21 is shaped in accordance with the shape of the pipe wall of the pipe 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 pipe body 1, the diameter of the inner arc-shaped surface is the same as the diameter of the inner wall surface of the pipe body 1, and the centers of the two arc-shaped surfaces coincide; the arc length of the arc-shaped strip-shaped upper clamping part 21 is about 5 / 8 of the whole pipe wall, and the longer the arc length is designed, the better the clamping stability is.

[0038] In order to facilitate the adjustment of the clamping mechanism 2 during the operation, the first adjusting mechanism 3 of the present application comprises an adjusting rod 31 and an operating member 32, one end of the adjusting rod 31 is connected with the movable clamping part 201, the other end of the adjusting rod 31 is connected with the operating member 32, and the operating member 32 drives the adjusting rod 31 to move when it is operated; the pipe body 1 is provided with a containing position 13 for containing the adjusting rod 31, and the operating member 32 is protruded on the outer wall near the upper part of the pipe body 1. It can be understood that during the operation, the doctor's hand cannot be inserted into the patient's body to adjust the clamping mechanism 2, so the operating member 32 needs to be arranged on the upper part of the pipe body 1, and since the upper part of the pipe body 1 is exposed outside the patient's body, the doctor can conveniently control the clamping mechanism 2; in addition, in order to reduce the cross-sectional area of the drill bit auxiliary sleeve as much as possible to avoid a too large operation channel, the adjusting rod 31 is contained in the containing position 13 of the pipe body 1.

[0039] In order to avoid the adjusting rod 31 from being separated from the containing position 13, a strip-shaped recess 313 can be formed on the adjusting rod 31, the length direction of the strip-shaped recess 313 is consistent with the length direction of the adjusting rod 31, and then a bolt is locked to the pipe body 1 through the strip-shaped recess 313, so that the adjusting rod 31 can be prevented from falling out of the containing position 13, and the adjusting rod 31 can still move up and down. The strip-shaped recess 313 can be arranged on the front surface of the adjusting rod 31 or on both sides of the adjusting rod 31.

[0040] It can be understood that the adjusting rod 31 only needs to meet the requirement of driving the movable clamping part 201 to move, and the moving direction of the movable clamping part 201 can be the left-right direction (i.e. the horizontal direction) or the up-down direction, so the direction and specific structure of the adjusting rod 31 can be designed according to the specific design requirements. In some embodiments, especially when the moving direction of the movable clamping part 201 is the up-down direction, the adjusting rod 31 is a rod body extending upward along the length direction of the pipe body 1, the containing position 13 is recessed inward from the outer wall of the pipe body 1, and the adjusting rod 31 is embedded in the containing position 13 and can move up and down, at this time, the outer surface of the adjusting rod 31 is flush with the outer wall of the pipe body 1 or slightly shrunk into the outer wall, and is best flush with the outer wall.

[0041] To realize that the doctor only needs to control the operation piece 32 by fingers, the operation piece 32 is a knob 321 or a knob 44 which controls the up and down movement of the adjusting rod 31 manually. Of course, the operation piece 32 can also be designed as an electric button which controls the adjusting rod 31 electrically and cooperates with a motor to realize electric control.

[0042] The first adjusting mechanism 3 of the present application can manually hold the operation piece 32 after adjusting the movable clamping part 201 to make the clamping mechanism 2 keep the clamping state. Alternatively, the first adjusting mechanism 3 can automatically hold the operation piece 32 through a linkage structure, which can better release the doctor's fingers and the attention to the fingers. In some embodiments, when the operation piece 32 is designed as a knob 321 which controls the adjusting rod 31 manually, the adjusting rod 31 is provided with a rack 312 at the upper position. In addition to the knob 321, the operation piece 32 also includes a gear 322 and a return spring 323. The gear 322 is engaged with the rack 312, and the knob 321 is coaxially connected and fixed with the gear 322 through a connecting column 324. Correspondingly, the pipe body 1 is provided with a mounting part 14 which is protruded on the outer part of the pipe body 1 and located at the accommodating position 13. The connecting column 324 passes through the mounting part 14, and the knob 321 and the gear 322 are located on the outer side and the inner side of the mounting part 14, respectively. The knob 321 and the gear 322 can move in the axial direction relative to the mounting part 14. The axial direction refers to the axial direction of the knob 321 when it rotates. The inner side of the mounting part 14 is provided with a gear recess 15 which can accommodate part of the gear 322. The return spring 323 is connected between the knob 321 and the outer side of the mounting part 14.

[0043] It can be understood that the elastic force of the return spring 323 always makes the knob 321 deviate radially outward from the pipe body 1. At this time, part of the gear 322 is embedded in the gear recess 15 of the mounting part 14, as shown in the state of Figure 4 If the knob 321 is manually rotated in this state, the knob 321 cannot be rotated due to the engagement of the gear 322 with the gear recess 15. At the same time, the rack 312 cannot move up and down because part of the gear 322 is still engaged with the rack 312. In other words, the adjusting rod 31 is also fixed and cannot move, and the movable clamping part 201 is also fixed and cannot move, keeping the clamping state. That is, the first adjusting mechanism 3 is in a locked and non-adjustable state. When it is necessary to adjust the movable clamping part 201, the knob 321 needs to be manually pressed towards the pipe body 1 to overcome the elastic force of the return spring 323, so that the gear 322 is separated from the gear recess 15. At this time, the first adjusting mechanism 3 is in an adjustable state, as shown in the state of Figure 3In the shown state, the knob 321 is rotated to drive the gear 322 to rotate, so as to move the rack 312 up and down, and then the movable clamping part 201 is adjusted. After the adjustment is completed, the knob 321 is released, and the knob 321 is automatically moved outward under the elastic force of the reset spring 323, so as to embed the gear 322 in the gear cavity 15, so that the clamping mechanism 2 is locked, and the clamping mechanism 2 can firmly clamp the bone during the operation, and the locking state does not need to be manually maintained, and the operation is further simplified.

[0044] In order to avoid the problem that the upper clamping part 21 is tilted or deviated to cause insecure clamping after the bone is ground by the grinding drill 9 in the upper and lower clamping mode. In some embodiments, the upper clamping part 21 comprises 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, and the movable extension part 212 and the fixed arc-shaped part 211 jointly form an arc-shaped strip-shaped upper clamping part 21 in the first state, and the movable extension part 212 extends transversely out of the outer wall of the pipe body 1 in the second state. That is, the movable extension part 212 abuts against the outer side of the bone part ground by the grinding head 92 in the second state, away from the periphery of the grinding head 92, so that the entire upper clamping part 21 is always in a secure state even if the fixed arc-shaped part 211 is tilted or deviated, and the clamping of the entire clamping mechanism 2 is more stable.

[0045] Similarly, in order to facilitate the doctor to adjust the state of the movable extension part 212, a second adjusting mechanism 4 is further included in some embodiments, and the second adjusting mechanism 4 is connected with the movable extension part 212 to control the switching of the movable extension part 212 between the first state and the second state.

[0046] The switching mode of the movable extension part 212 can be linearly extended from the position of the fixed arc-shaped part 211, can be rotated from the position of the fixed arc-shaped part 211, or can be other modes such as both moving and rotating. Among them, the linearly extended mode, the corresponding second adjusting mechanism 4 can be realized by two wedge-shaped blocks to convert the movement along the axis direction of the pipe body 1 into the movement of the movable extension part 212 along the radial direction of the pipe body 1. And in the mode of rotating from the position of the fixed arc-shaped part 211, the corresponding second adjusting mechanism 4 can be realized by a rotating shaft and a gear. Figure 7In the example shown, the activity extension 212 includes a pair of rotating extension legs 2121; the second adjusting mechanism 4 includes a driving gear 41, a driven gear 42, a rotating shaft 43, and a push key 44, and the rotating shafts of the corresponding rotating extension legs 2121 are fixedly provided with output gears 2122, one end of the rotating shaft 43 is coaxially connected with the driving gear 41, the other end of the rotating shaft 43 is fixedly connected with the push key 44, one side of the driven gear 42 is engaged with one side of the driving gear 41, the output gear 2122 of one of the rotating extension legs 2121 is engaged with the other side of the driving gear 41, and the output gear 2122 of the other rotating extension leg 2121 is engaged with the other side of the driven gear 42. Then, when the push key 44 is manually pushed, the rotating shaft 43 will rotate in the direction of the push, thereby driving the driving gear 41 to rotate, the driving gear 41 in turn drives the output gear 2122 engaged therewith to rotate, thereby rotating the rotating extension leg 2121 out of the position of the fixed arc-shaped part 211; at the same time, the rotation of the driving gear 41 also drives the driven gear 42 to rotate, and the driven gear 42 in turn drives the output gear 2122 engaged therewith to rotate, thereby also rotating the other rotating extension leg 2121 out of the position of the fixed arc-shaped part 211.

[0047] It can be understood that the angle of the rotating extension leg 2121 is not specifically limited, as long as it can meet the position away from the grinding in the second state. Similarly, whether the angles of the respective rotations of the two rotating extension legs 2121 are the same or different is not specifically limited, and they can be the same or different. In the example shown, Figure 7 In the example shown, since the driving gear 41 and the driven gear 42 are the same in size, and the output gears 2122 of the two rotating extension legs 2121 are also the same in size, the angles of the rotations of the two rotating extension legs 2121 are also the same; and through the diameter ratio and the tooth number ratio design of the driving gear 41, the driven gear 42, and the two output gears 2122, the angles of the rotations of the two rotating extension legs 2121 are both 90°.

[0048] In order to further simplify the operation, in some embodiments, the tube body 1 is designed to include an upper tube body 11 and a lower tube body 12, wherein the clamping mechanism 2 is arranged on the lower tube body 12, the lower end of the upper tube body 11 is movably connected with the upper end of the lower tube body 12 along the axis, and the upper end of the upper tube body 11 is fixedly connected with the handle part 91 of the drill 9. It can be understood that by fixing the upper tube body 11 with the handle of the drill 9, the consistency of the drill auxiliary sleeve and the swing of the drill 9 is realized, that is, when the doctor tilts or swings the angle of the drill 9 by the handle part 91 of the drill 9, the drill auxiliary sleeve also tilts or swings the angle synchronously, so the doctor does not need to control the direction of the drill auxiliary sleeve, and even if the other hand does not hold the drill auxiliary sleeve, the problem that the grinding head 92 of the drill 9 is hindered by the sidewall of the drill auxiliary sleeve will not occur, but generally for more stable grinding, it is better to hold the drill auxiliary sleeve with the other hand; in addition, since the upper tube body 11 can move downward relative to the lower tube body 12, the upper tube body 11 will not hinder the drill 9 from deepening the grinding of the bone, and the lower tube body 12 will not move downward because it is clamped by the clamping mechanism 2, so when the drill 9 is moved downward, only the upper tube body 11 is moved downward relative to the lower tube body 12, without affecting the lower tube body 12, so there is no need to worry about the lower tube body 12 moving downward and damaging the nerve.

[0049] Further, the relative movement distance between the upper tube body 11 and the lower tube body 12 can be realized by the cooperation of the limiting groove 17 and the limiting protrusion 18, as shown in the example, Figure 9 as shown in the example, a pair of limiting grooves 17 are arranged on the upper part of the lower tube body 12, and a pair of limiting protrusions 18 are arranged on the lower part of the corresponding upper tube body 11, after the limiting protrusions 18 are clamped into the limiting grooves 17, the limiting protrusions 18 can move up and down within the length range of the limiting grooves 17, and the up and down movement range is also the relative movement distance of the upper tube body 11 relative to the lower tube body 12, by setting the relative movement distance, the deepening distance of the grinding head 92 can be further limited, which can better avoid the grinding head 92 from being too deep and grinding the limiting part 5. In addition, a telescopic spring 6 can be arranged at the connection between the upper tube body 11 and the lower tube body 12, and by the 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 to reset.

[0050] The connection mode of the upper tube body 11 and the handle part 91 of the drill 9 can be clamping, screwing, buckling, inserting, etc., and is not limited in particular. For example, 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.

[0051] The following is a detailed description of specific embodiments.

[0052] Example 1: 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.

[0053] 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.

[0054] 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.

[0055] like Figure 2As shown, the first adjusting mechanism 3 of the embodiment comprises an adjusting rod 31 and an operating member 32, the adjusting rod 31 is a rod body extending upward along the length direction of the tube body 1, the lower end of the adjusting rod 31 is integrally formed with the upper clamping part 21, and the upper end of the adjusting rod 31 extends to a position close to the upper end of the tube body 1. The tube body 1 is provided with a containing position 13 for accommodating the adjusting rod 31, the containing position 13 of the embodiment is concave inward from the outer wall of the tube body 1, the shape and width of the containing position 13 are the same as those of the adjusting rod 31, the adjusting rod 31 is movably embedded in the containing position 13, and the outer surface of the adjusting rod 31 is flush with the outer wall of the tube body 1 after embedding. The upper front surface of the adjusting rod 31 of the embodiment is provided with a recessed position 311 inwardly recessed, the width of the recessed position 311 is smaller than that of the adjusting rod 31, so that the recessed position 311 has two side walls, and a rack 312 is arranged on one of the side walls. The operating member 32 of the embodiment comprises a knob 321, a gear 322 and a return spring 323, wherein the gear 322 is engaged with the rack 312, the knob 321 is coaxially connected and fixed with the gear 322 through a connecting column 324; correspondingly, the tube body 1 is provided with a mounting part 14, the mounting part 14 is protruded on the outer part of the tube body 1 and located at the containing position 13, the connecting column 324 passes through the mounting part 14, and the knob 321 and the gear 322 are located on the outer side and the inner side of the mounting part 14 respectively, and the knob 321 and the gear 322 can move in the axial direction relative to the mounting part 14, the inner side of the mounting part 14 is provided with a gear recess 15 capable of accommodating part of the gear 322, and the return spring 323 is connected between the knob 321 and the outer side of the mounting part 14.

[0056] When the first adjusting 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, so that the gear 322 is disengaged from the gear recess 15, at this time, the first adjusting mechanism 3 is in an adjustable state, as shown in the state, Figure 3 When the adjustment is completed, the knob 321 is automatically moved in the direction of radially outward deviating from the tube body 1 under the elastic force of the return spring 323, thereby driving the gear 322 to move outward so that the gear 322 is embedded into the gear recess 15, as shown in the state, Figure 4In the shown state, if the knob 321 is manually rotated, the knob 321 cannot be rotated due to the engagement of the gear 322 with the gear recess 15, and the rack 312 cannot be moved up and down due to the engagement of the gear 322 with the rack 312, which is equivalent to the fixing of the adjusting rod 31, and the upper clamping part 21 is also fixed, and the clamping mechanism 2 is kept in the clamping state, which ensures that the clamping mechanism 2 can firmly clamp the bone during the operation, and the locking state does not need to be manually maintained, which further simplifies the operation.

[0057] A strip-shaped recess 313 is arranged on the other side wall of the recess 311, and the length direction of the strip-shaped recess 313 is consistent with the length direction of the adjusting rod 31, and then a bolt (not shown in the figure) is locked to the pipe body 1 through the strip-shaped recess 313, so that the adjusting rod 31 cannot fall out of the containing position 13, and the adjusting rod 31 can still be moved up and down.

[0058] In this embodiment, the clamping mechanism 2 is used to fix the burr auxiliary sleeve to the bone to be ground, so that the doctor only needs to control the direction of the burr auxiliary sleeve, and does not need to worry that the burr auxiliary sleeve will deviate from the bone position during grinding of the bone, and will not accidentally move down with the burr 9 and press and damage the nerve, which greatly reduces the difficulty of the operation, makes the operation simpler, and enables the doctor to focus more on the grinding of the burr 9, and the experience level of the doctor is not very high.

[0059] Embodiment II: As shown in Figures 5-7 This embodiment includes a pipe body 1 for the burr 9 to extend into, and a limiting part 5 for preventing the burr 9 from grinding the nerve below the bone is arranged below the lower end of the pipe body 1, and the pipe body 1 is an integral pipe body 1. This embodiment also includes a clamping mechanism 2 for clamping the bone to be ground, and the clamping mechanism 2 is arranged at the lower end of the pipe body 1.

[0060] The clamping mechanism 2 of this embodiment includes two clamping parts, an upper clamping part 21 and a lower clamping part 22, wherein the upper clamping part 21 is a movable clamping part 201, the lower clamping part 22 is a fixed clamping part 202, and the lower clamping part 22 constitutes the limiting part 5. The upper clamping part 21 can be moved up and down between a first position and a second position through the first adjusting mechanism 3, wherein the first position is the position where the upper end surface of the upper clamping part 21 is in contact with the lower end surface of the pipe body 1, and the second position is the position where the lower end surface of the upper clamping part 21 is in contact with the upper end surface of the lower clamping part 22.

[0061] The structure of the first adjusting mechanism 3 for controlling the up and down movement of the upper clamping part 21 of this embodiment is exactly the same as that of embodiment I, and thus will not be described again.

[0062] Different from the first embodiment, the upper clamping part 21 of the second embodiment comprises a fixed arc part 211 and a movable extension part 212, and further comprises a second adjusting mechanism 4 connected with the movable extension part 212 to control the switching of the movable extension part 212 between the first state and the second state. The fixed arc part 211 has the same shape as the pipe wall of the pipe body 1, i.e. 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 arc surfaces coincide; and the arc length of the fixed arc part 211 is about 5 / 8 of the whole pipe wall. The movable extension part 212 of the second embodiment is movably connected with the fixed arc part 211, as shown in Figure 6 , the movable extension part 212 comprises a pair of rotating extension legs 2121, the arc length of the rotating extension legs 2121 is the same as that of the fixed arc part 211, and the thickness of the rotating extension legs 2121 is half of that of the fixed arc part 211. The middle part of the lower end surface of the fixed arc part 211 is cut to half of its thickness, and the pair of rotating extension legs 2121 are installed at the cut part. Thus, when the movable extension part 212 is in the first state, the fixed arc part 211 and the movable extension part 212 together form an arc-shaped strip-shaped upper clamping part 21, and when the movable extension part 212 is in the second state, the movable extension part 212 is transversely turned out of the outer wall of the pipe body 1. The rotating shafts of the pair of rotating extension legs 2121 are close to each other and located at the middle of the cut part, and an output gear 2122 is fixedly arranged on the rotating shaft of the rotating extension leg 2121.

[0063] Correspondingly, as shown in Figure 7 , the second adjusting mechanism 4 of the second embodiment comprises a driving gear 41, a driven gear 42, a rotating shaft 43 and a shifting key 44. A gear box position 2111 is arranged at the middle of the cut part of the fixed arc part 211, the driving gear 41 and the driven gear 42 are both installed in the gear box position 2111, and the output gear 2122 on the rotating extension leg 2121 is also installed in the gear box position 2111. A gear box cover 2112 covers the open end of the gear box position 2111 and is locked and fixed, so as to prevent the gears 322 from falling out of the gear box position 2111 and to limit the falling of the pair of rotating extension legs 2121.

[0064] The rotation shaft 43 of this embodiment is coaxially connected with the driving gear 41 at one end, and is fixedly connected with the push key 44 at the other end. In order to facilitate the control of the push key 44, the push key 44 is also arranged at a position close to the upper portion of the tube body 1. Therefore, the rotation shaft 43 needs to extend from the gear box position 2111 to the upper portion of the tube body 1. In this embodiment, a through hole 314 is arranged on the adjusting rod 31, and the rotation shaft 43 extends upward from the through hole 314 and extends into the recessed position 311 below the knob 321. That is, the push key 44 is installed at a position below the knob 321. The push key 44 and the knob 321 share the mounting portion 14, and the mounting portion 14 is provided with a push groove 16. The inner end of the push key 44 is fixedly sleeved with the rotation shaft 43, and the outer end of the push key 44 extends out of the tube body 1 through the push groove 16 so as to be pushed. When the push key 44 is pushed from one end of the push groove 16 to the other end, the driving gear 41 can be driven to rotate.

[0065] The side of the driven gear 42 of this embodiment is engaged with the side of the driving gear 41. The output gear 2122 of one of the rotation extension feet 2121 is engaged with the other side of the driving gear 41, and the output gear 2122 of the other rotation extension foot 2121 is engaged with the other side of the driven gear 42.

[0066] When the drill guide sleeve is about to enter the patient's body, the rotation extension feet 2121 need to be kept in the first state at this time, so that the drill guide sleeve does not damage the surrounding tissue of the surgical channel during the entering process. When the drill guide sleeve reaches the desired position and the clamping mechanism 2 has completed the clamping of the bone to be ground, the rotation extension feet 2121 can be rotated to the second state, and the specific operation is as follows: the push key 44 is manually pushed from one end of the push groove 16 to the other end, and the rotation shaft 43 rotates in the pushing direction, thereby driving the driving gear 41 to rotate. The driving gear 41 drives the output gear 2122 engaged therewith to rotate, thereby rotating the rotation extension foot 2121 where the output gear 2122 is located out of the position of the fixed arc-shaped portion 211. At the same time, the rotation of the driving gear 41 also drives the driven gear 42 to rotate, and the driven gear 42 drives the output gear 2122 engaged therewith to rotate, thereby rotating the other rotation extension foot 2121 out of the position of the fixed arc-shaped portion 211. At this time, the pair of rotation extension feet 2121 are in the second state, as shown in 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.

[0067] 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.

[0068] Example 3:

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] Differing from the embodiment one and the embodiment two, the pipe body 1 of this embodiment comprises an upper pipe body 11 and a lower pipe body 12, wherein the clamping mechanism 2, the first adjusting mechanism 3 and the second adjusting mechanism 4 are all arranged on the lower pipe body 12; the lower end of the upper pipe body 11 is movably connected with the upper end of the lower pipe body 12 along the axis, and the upper end of the upper pipe body 11 is fixedly connected with the handle part 91 of the burr 9, so as to realize the consistency of the burr auxiliary sleeve pipe and the burr 9, that is, when the doctor drives the burr 9 to tilt or swing through the handle part 91 of the burr 9, the burr auxiliary sleeve pipe also tilts or swings synchronously, so that the doctor does not need to control the direction of the burr auxiliary sleeve pipe any more; and since the upper pipe body 11 can move downward relative to the lower pipe body 12, the upper pipe body 11 will not hinder the burr 9 to move downward to grind the bone, and the lower pipe body 12 will not move downward since it is clamped by the clamping mechanism 2, so when the burr 9 moves downward, only the upper pipe body 11 will move downward relative to the lower pipe body 12, without affecting the lower pipe body 12, so there is no need to worry that the lower pipe body 12 will move downward to compress and damage the nerve.

[0074] As shown in Figure 9 , this embodiment is provided with a pair of limiting grooves 17 on the upper part of the lower pipe body 12, and a pair of limiting protrusions 18 are arranged on the lower part of the upper pipe body 11, after the limiting protrusions 18 are clamped 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 moving distance of the upper pipe body 11 relative to the lower pipe body 12, by setting the relative moving distance, the downward moving distance of the grinding head 92 can be further limited, so that the grinding head 92 can be better prevented from moving downward too deeply to grind and damage the limiting part 5. In addition, this embodiment is provided with a telescopic spring 6 at the connection part of the upper pipe body 11 and the lower pipe body 12, through the telescopic spring 6, after the downward pressure on the upper pipe body 11 is released, the telescopic spring 6 can lift the upper pipe body 11 upward to reset.

[0075] The connection mode of the upper pipe body 11 and the handle part 91 of this embodiment is the sleeving and clamping mode, the elastic sleeve interface 19 is arranged on the upper end of the upper pipe body 11, the locking ring 7 is arranged outside the sleeve interface, the compression spring 8 is sleeved between the lower end of the locking ring 7 and the upper pipe body 11, the compression spring 8 always keeps the locking ring 7 close to the elastic sleeve interface 19 to lock the elastic sleeve interface 19. When it is needed to connect the upper pipe body 11 with the handle part 91, the locking ring 7 needs to be manually pulled downward 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 expanded outward, so that the elastic sleeve interface 19 can be easily sleeved to the lower end part of the handle part 91, after the sleeve is connected, the locking ring 7 is released, the locking ring 7 is reset upward under the action of the compression spring 8, so that the elastic sleeve interface 19 is contracted to clamp the handle part 91, as shown in Figure 10 . This connection mode is not only convenient to connect, but also convenient to disassemble.

[0076] In the description of the specification, the description using the terms "embodiment", "example", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in an appropriate manner.

[0077] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, alternatives, and variations can be made thereto without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. A depth-limited burr drill auxiliary cannula comprising a tube body for a burr drill to be inserted, the tube body being provided with a stopper for preventing the burr drill from grinding below a nerve under a bone mass below an end portion inserted into a patient, characterized in that, The device further comprises a clamping mechanism for clamping the bone to be ground, which is arranged at the lower end of the tube body, and comprises at least two clamping parts, at least one of which is a movable clamping part, which is adjusted to move relative to the other clamping part by a first adjusting mechanism, and the limiting part is fixedly connected with the fixed clamping part or the lower end surface of the tube body.

2. The limited-depth spinal burr assist cannula of claim 1, wherein, The clamping mechanism comprises an upper clamping part and a lower clamping part, wherein the upper clamping part is a movable clamping part, the upper clamping part has a first position and a second position, the first position is the position where the upper end surface of the upper clamping part meets the lower end surface of the tube body, and the second position is the position where the lower end surface of the upper clamping part meets the upper end surface of the lower clamping part, and 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 limited-depth spinal burr assist cannula of claim 2, wherein, The upper clamping part is an arc-shaped strip-shaped upper clamping part, the outer arc-shaped surface of the arc-shaped strip-shaped upper clamping part does not exceed the outer wall surface of the tube body, and the inner arc-shaped surface of the arc-shaped strip-shaped upper clamping part does not exceed the inner wall surface of the tube body.

4. The limited-depth spinal burr assist cannula of claim 1, wherein, The first adjusting mechanism comprises an adjusting rod and an operating member, one end of the adjusting rod is connected with the movable clamping part, the other end of the adjusting rod is connected with the operating member, and the operating member is operated to drive the movable clamping part to move; the tube body is provided with a containing position for containing the adjusting rod, and the operating member is protruded on the outer wall near the upper part of the tube body.

5. The limited-depth spinal burr assist cannula of claim 4, wherein, The adjusting rod is a rod body extending upward along the length direction of the tube body, the containing position is recessed inward from the outer wall of the tube body, and the adjusting rod is movably embedded in the containing position; the operating member is a push key or a knob for manually controlling the up and down movement of the adjusting rod.

6. The limited-depth spinal burr assist cannula of claim 5, wherein, The adjusting rod is provided with a rack at the upper position; the operating member comprises a knob, a gear and a return spring, the gear is engaged with the rack, the knob is coaxially connected and fixed with the gear through a connecting column; the tube body is provided with a mounting part, the connecting column passes through the mounting part so that the knob and the gear are located on the outer side and the inner side of the mounting part respectively, and the knob and the gear can move in the axial direction relative to the mounting part, the inner side of the mounting part is provided with a gear recess capable of containing part of the gear, and the return spring is connected between the position between the knob and the outer side of the mounting part.

7. The limited-depth spinal burr assist cannula of claim 2, wherein, The upper clamping part comprises a fixed arc-shaped part and a movable extension part, the movable extension part is movably connected to the fixed arc-shaped part, the movable extension part and the fixed arc-shaped part jointly constitute an arc-shaped strip-shaped upper clamping part when the movable extension part is in a first state, and the movable extension part extends transversely out of the outer wall of the tube body when the movable extension part is in a second state.

8. The limited-depth spinal burr assist cannula of claim 7, wherein, The device further comprises a second adjusting mechanism connected with the movable extension part to control the movable extension part to switch between the first state and the second state.

9. The limited-depth spinal burr assist cannula of claim 8, wherein, The active extension part comprises a pair of rotating extension legs; the second adjusting mechanism comprises a driving gear, a driven gear, a rotating shaft and a push key, the rotating shafts of the corresponding rotating extension legs are fixedly provided with output gears, one end of the rotating shaft is coaxially connected with the driving gear, the other end of the rotating shaft is fixedly connected with the push key, one side of the driven gear is engaged with one side of the driving gear, the output gear of one rotating extension leg is engaged with the other side of the driving gear, and the output gear of the other rotating extension leg is engaged with the other side of the driven gear.

10. The limited-depth spinal burr assist cannula of claim 1, wherein, The pipe body comprises an upper pipe body and a lower pipe body, the clamping mechanism is arranged on the lower pipe body, the lower end of the upper pipe body is movably connected with the upper end of the lower pipe body along the axis, and the upper end of the upper pipe body is fixedly connected with the handle part of the grinding drill.

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