Bone peg kit

Abstract

The present application relates to a bone pin kit, comprising a support, a screw, an extension sleeve, a connecting rod, a locking screw, a locking screwdriver and an extension sleeve extractor; the support comprises two flaps; the outer wall of one end of the locking screwdriver has a plurality of ribs and a first engaging section, the opposite ends of the first engaging section have a first outer diameter and a second outer diameter, the second outer diameter is smaller than the first outer diameter; the locking screw has a through portion, the inner wall of the locking screw is provided with a plurality of grooves, the through portion has a second engaging section inside, the second engaging section has a first inner diameter, the first inner diameter is smaller than the first outer diameter and larger than the second outer diameter; the locking screw and the locking screwdriver are arranged in the support and the extension sleeve; the extension sleeve comprises two extension flaps, the extension sleeve is sleeved outside the support, and the inner wall of the extension flap and the outer wall of the flap are engaged by the engaging structure.

Description

Technical Field

[0001] This invention relates to the field of medical technology, and more particularly to a bone screw kit for fixing spinal linkages. Background Technology

[0002] For patients with spinal disorders, problems such as intervertebral disc displacement, lesions, and atrophy can easily occur, leading to narrowing of the intervertebral space and compression of the spinal nerves, thus causing numbness or pain in the back.

[0003] To address these issues, the current common treatment method is a minimally invasive surgery that uses bone screws to implant connecting rods into the spine, using the connecting rods to support the relative distance and position between the vertebrae.

[0004] Based on their length, bone screws can be divided into "short winged screws" and "long winged screws," with long winged screws further divided into open and closed types. Because minimally invasive surgery involves small and deep incisions, if short winged screws are used, an expander must be used to enlarge the opening to facilitate surgical manipulation. Therefore, in terms of practicality and ease of operation, open-type long winged screws simplify the surgical procedure for short winged screws, making them a preferred and widely used type of bone screw in this field.

[0005] The existing open-type long-wing bone screw structure mainly consists of a positioning sleeve and a screw. The positioning sleeve includes an integrally formed fixation base and a calibration sleeve. The screw is screwed into the fixation base and protrudes outside the fixation base, and has internal threads in the fixation base. The calibration sleeve is used for calibration during surgery. The screw and positioning sleeve are screwed into the spine, the spinal link is inserted, and then a locking screw is screwed into the fixation base to tighten the spinal link. Finally, the calibration sleeve is broken off and removed using a tool.

[0006] The existing open-type long-wing bone screws have many shortcomings, including:

[0007] (1) Different tools must be used when inserting screws, inserting spinal rods, locking screws, breaking calibration sleeves, and removing calibration sleeves. The entire surgical procedure involves many instruments and is very complicated.

[0008] (2) The fractured part at the connection between the calibration sleeve and the fixation base is thin and easily bent by external force such as hand tools during the operation, which affects the accuracy of inserting the spinal rod.

[0009] (3) It is impossible to know for sure whether the locking screw has tightened the locking screw. It can only rely on the operator's experience and feeling. Therefore, two situations often occur: the locking screw is not tightened properly and the spinal linkage cannot be tightened, or the locking screw is over-tightened and stripped. Therefore, the locking screw or the fixing seat must be replaced.

[0010] In addition, another type of sleeve-type long-winged bone screw is observed, which mainly consists of a screw head, a screw, and a long cylindrical expander that can be fitted over the screw head. The screw is screwed into the screw head and protrudes beyond the screw head, its shape resembling a short-winged screw. Both the screw head and the expander have internal threads, and the expander is used for calibration during surgery. The screw, along with the positioning sleeve, is screwed into the spine, a spinal link is inserted, and then a rod-shaped tool with external threads and a locking screw are screwed into the expander. The locking screw is used to tighten the spinal link, and then the expander is removed.

[0011] While the aforementioned existing sleeve-type long-winged bone screws can avoid some of the shortcomings of existing open-type long-winged bone screws, they also have many drawbacks, including:

[0012] (1) When a rod-shaped tool with external threads and a locking screw are screwed into the expander, the expander can easily expand outward, causing the patient's surgical opening to be enlarged.

[0013] (2) Different tools must be used when inserting screws, inserting spinal rods, locking screws, and removing expanders. The entire surgical procedure involves many instruments and is very complicated.

[0014] (3) It is impossible to know for sure whether the locking screw has tightened the locking screw. It can only rely on the operator's experience and feeling. Therefore, two situations often occur: the locking screw is not tightened properly and the spinal linkage cannot be tightened, or the locking screw is over-tightened and stripped. Therefore, the locking screw or the fixing seat must be replaced.

[0015] Therefore, how to develop a "bone screw kit" that is simple in structure, easy to operate, and can reliably and properly tighten the spinal link with locking screws without damaging the patient's surgical incision is an urgent issue for people in the relevant technical field to solve. Summary of the Invention

[0016] The purpose of this invention is to provide a bone screw kit for fixing spinal linkages.

[0017] This invention provides a bone screw kit, characterized in that it comprises:

[0018] A support member is composed of a bottom and two winglets. The bottom has a hole, and the two winglets protrude from the top surface of the bottom on both sides in a first direction. The inner sidewall of each winglet is provided with a first internal thread, and a recess is formed between the bottom and the two winglets.

[0019] A screw having a threaded portion, the screw being pivotally mounted on the bottom, the threaded portion passing through the hole and protruding from the bottom surface of the bottom, the threaded portion being able to swing outside the bottom of the support member;

[0020] An extension sleeve is composed of a connecting piece and two extension blades. The two extension blades are arranged parallel to the first direction on both sides of the connecting piece. The outer side wall of each extension blade is provided with a first external thread. The inner side wall of each extension blade and the outer side wall of each blade are provided with a locking structure that can engage with each other. The extension sleeve is sleeved on the two blades of the support member parallel to the first direction. The locking structure corresponding to the inner side wall of each extension blade and the outer side wall of each blade engages.

[0021] A connecting rod, whose axis is perpendicular to the first direction, is disposed between the two blades;

[0022] A locking screwdriver has a first axial end and a second axial end opposite each other along its axial direction. The outer wall of the first axial end of the locking screwdriver has a plurality of ribs, the length direction of each rib being parallel to the first direction. The first axial end of the locking screwdriver has a first engaging section that protrudes parallel to the first direction from the plurality of ribs. One end of the first engaging section adjacent to the plurality of ribs has a first outer diameter, and the other end of the first engaging section is away from the plurality of ribs and has a second outer diameter, the second outer diameter being smaller than the first outer diameter.

[0023] A locking screw, ring-shaped, has a third axial end and a fourth axial end opposite to each other. The center of the locking screw has a through portion parallel to a first direction. The inner wall of the locking screw has a plurality of grooves, each groove's length direction being parallel to the first direction. The outer wall of the locking screw has a second external thread. Within the through portion, near the third axial end of the locking screw, there is a second engaging section. This second engaging section has a first inner diameter, which is smaller than the first outer diameter and larger than the third axial end. Two outer diameters; the first axial end of the locking screw is inserted into the through portion of the locking screw in parallel with the first direction, each rib is engaged between each groove, the first engaging section passes through and engages with the second engaging section, and the first engaging section protrudes beyond the third axial end by a length, so that the locking screw and the locking screw are connected, the locking screw is driven to rotate and drive the locking screw to rotate, so that the second external thread engages with the first internal thread, and the connecting rod is clamped between the locking screw and the bottom;

[0024] An extension sleeve release device includes a sleeve with a through portion and a recess at each of its two axial ends. The inner sidewall of the sleeve has a second internal thread. The sleeve is fitted over the extension sleeve. The second internal thread engages with the first external thread. Continuous rotation of the sleeve causes the second axial end of the locking screwdriver to resist the recess and disengage the extension sleeve from the support member.

[0025] The bone screw kit wherein the length of the first engaging section protruding outside the third axial end is in the range of 0.2 to 0.5 mm.

[0026] The bone screw kit, wherein the engaging structure includes:

[0027] Each of the winglets has a dovetail seat on its outer side wall, the length of which extends parallel to the first direction; and

[0028] Each of the extended winglets has a dovetail groove on its inner sidewall, and the length of the dovetail groove extends parallel to the first direction; the extended sleeve is sleeved on the two winglets of the support member parallel to the first direction, and each dovetail groove is respectively engaged with a corresponding dovetail seat.

[0029] The bone screw kit, wherein: each of the winglets has a fixing piece and a breaking piece parallel to the first direction, the fixing piece is connected to the bottom, and the connection between the breaking piece and the fixing piece forms a groove.

[0030] The bone screw kit, wherein the dovetail seat of the outer side wall of each of the winglets is disposed on the fixing piece.

[0031] The bone screw kit, wherein: the range of the first internal thread covers the inner wall of the fixation piece and the inner wall of the broken piece.

[0032] The bone screw kit, wherein: the connecting piece of the extension sleeve and the two extension flaps have the same curvature, and the extension sleeve forms a cylindrical structure.

[0033] The bone screw kit, wherein: the first external thread of the outer sidewall of each of the extended winglets is provided at one end of each extended winglet near the connecting piece.

[0034] The bone screw kit, wherein: the outer side wall of the first axial end of the locking screw has a plurality of ribs, the length direction of each rib being parallel to the first direction; the locking screw is annular, and the inner side wall of the locking screw has a plurality of grooves, the length direction of each groove being parallel to the first direction; the first axial end of the locking screw is inserted into the locking screw, and the plurality of ribs engage between the plurality of grooves, so that the first axial end is connected to the locking screw.

[0035] The bone screw kit, wherein: the extension sleeve ejector includes a handle disposed at the axial end of the sleeve having the concave portion, and continuous rotation of the handle causes the second axial end of the locking screwdriver to resist the concave portion and disengage the extension sleeve from the two flaps of the support member.

[0036] The bone screw kit provided by this invention features a dovetail groove and a dovetail seat that can be separably engaged between the extension sleeve and the support. The extension sleeve release device, the extension sleeve, and the locking screw have a special relative movement design. Furthermore, the locking screw and locking screw, which are specially designed to engage with each other, can reliably and properly tighten the spinal link without damaging the patient's surgical opening. This effectively achieves the benefits of simple structure, convenient operation, and no damage to the patient's surgical opening. Attached Figure Description

[0037] Figure 1 This is an exploded three-dimensional structural diagram of an embodiment of the present invention.

[0038] Figure 2 and Figure 3 This is an exploded structural diagram showing the combination of the support member, screw, and extension sleeve of the present invention.

[0039] Figure 4 and Figure 5 This is a schematic diagram of the combined structure of the support member, screw, and extension sleeve of the present invention.

[0040] Figure 6 This is a schematic diagram of the structure of the locking screw and locking screwdriver before they are engaged.

[0041] Figure 7 This is an enlarged exploded view of the locking screw and part of the locking screwdriver of the present invention.

[0042] Figure 8 This is an enlarged exploded axial cross-sectional view of the locking screw and part of the locking screwdriver of the present invention.

[0043] Figure 9 This is a schematic diagram of the enlarged axial cross-sectional view of the combination structure of the locking screw and part of the locking screwdriver of the present invention.

[0044] Figure 10 This is a schematic diagram of the combined structure of the present invention after the locking screw is engaged with the bottom end of the locking screwdriver.

[0045] Figure 11 This is a schematic diagram of the structure of the present invention, in which the locking screwdriver and the locking screw are engaged and then placed together in the extension sleeve and the support.

[0046] Figure 12 This is an enlarged axial cross-sectional view of the combined structure of the locking screw and locking screwdriver of the present invention, which are inserted into the extension sleeve and the support member, with the first axial end abutting against the connecting rod.

[0047] Figure 13 This is a schematic diagram of the structure of the extension sleeve release device and the extension sleeve of the present invention being fitted together.

[0048] Figure 14 This is a schematic diagram of the structure of the rotary extension sleeve ejector of the present invention.

[0049] Figure 15 This is a cross-sectional view of the combined structure of the extension sleeve ejector, locking screwdriver, and extension sleeve of the present invention.

[0050] Figure 16A for Figure 15 A magnified structural diagram of part A.

[0051] Figure 16B for Figure 15 A magnified structural diagram of part B.

[0052] Figure 17 This is a schematic diagram of the extension sleeve release device of the present invention, which separates the extension sleeve from the support member.

[0053] Reference numerals: 100 - Bone screw kit; 10 - Support; 11 - Bottom; 12 - Two wings; 121 - Fixing piece; 122 - Fold piece; 123 - Groove; 13 - Hole; 14 - First internal thread; 15 - Dovetail seat; 16 - Recess; 20 - Screw; 21 - Threaded part; 30 - Extension sleeve; 31 - Connecting piece; 32 - Extension wing; 33 - Dovetail groove; 34 - First external thread; 40 - Connecting rod; 50 - Locking screw; 51 - Groove; 52 - Second external thread Thread; 53-Third axial end; 54-Fourth axial end; 55-Through portion; 56-Second engaging section; 60-Locking screwdriver; 61-First axial end; 62-Second axial end; 63-Rib; 64-First engaging section; 70-Extension sleeve ejector; 71-Sleeve; 711-Through portion; 712-Inner recess; 713-Second internal thread; 72-Handle; D1-First outer diameter; D2-Second outer diameter; D3-First inner diameter; F1-First direction; L-Length. Detailed Implementation

[0054] Please see Figure 1 As shown, the bone screw kit 100 provided by the present invention includes a support member 10, a screw 20, an extension sleeve 30, a connecting rod 40, a locking screw 50, a locking screwdriver 60, and an extension sleeve release device 70.

[0055] It should be noted that the length of the connecting rod 40 depends on the actual usage requirements. Figure 1 Only a portion of the connecting rod 40 is shown for illustration. Typically, the length of the connecting rod 40 should be sufficient to overlap two adjacent bone screw kits 100.

[0056] Please see Figures 1 to 5As shown, the support member 10 consists of a bottom 11 and two flaps 12. The bottom 11 has a hole 13. Each flap 12 has a fixing piece 121 and a breaking piece 122 parallel to the first direction F1. The fixing piece 121 is connected to the bottom 11, and a groove 123 is formed at the connection between the breaking piece 122 and the fixing piece 121. The two flaps 12 protrude from both sides of the top surface of the bottom 11 parallel to the first direction F1.

[0057] Each wing 12 has a first internal thread 14 on its inner sidewall. The range of the first internal thread 14 covers the inner sidewall of the fixing piece 121 and the inner sidewall of the broken piece 122.

[0058] Each wing 12 has a dovetail seat 15 on the outer wall of its fixing plate 121. The length of the dovetail seat 15 extends parallel to the first direction F1. A recess 16 is formed between the bottom 11 and the two wing 12.

[0059] The screw 20 has a threaded portion 21. The screw 20 is pivotally mounted on the bottom 11, and the threaded portion 21 passes through the hole 13 and protrudes from the bottom surface of the bottom 11. The threaded portion 21 can swing outside the bottom 11 of the support member 10.

[0060] Typically, the screw 20 has a spherical head with an outer diameter larger than that of the threaded portion 21. The hole 13 is concave. After the screw 20 is placed into the recess 16 and the threaded portion 21 is passed through the hole 13, the spherical head engages in the concave hole 13. The threaded portion 21 can swing outward from the bottom 11 of the support member 10. This is a technique commonly used by those skilled in the art and therefore will not be described in detail.

[0061] The extension sleeve 30 consists of a connecting piece 31 and two extension blades 32. The two extension blades 32 are arranged on both sides of the connecting piece 31 parallel to the first direction F1. The inner wall of each extension blade 32 is provided with a dovetail groove 33. The length extension direction of the dovetail groove 33 is parallel to the first direction F1. The outer wall of each extension blade 32 is provided with a first external thread 34.

[0062] The connecting piece 31 of the extension sleeve 30 and the two extension blades 32 have the same curvature, so that the extension sleeve 30 forms a cylindrical structure.

[0063] The first external thread 34 of the outer side wall of the extension wing 32 is provided at one end of the extension wing 32 near the connecting piece 31.

[0064] The extension sleeve 30 is sleeved parallel to the first direction F1 on the outside of the two wings 12 of the support member 10, and each dovetail groove 33 is respectively engaged with a corresponding dovetail seat 15.

[0065] It must be noted that the dovetail seat 15 and the dovetail groove 33 are merely one embodiment of a locking structure in which the inner wall of the extended wing 32 and the outer wall of the wing 12 engage with each other.Figure 2 The dovetail seat 15 is positioned on the outer wall of the wing 12, and the dovetail groove 33 is positioned on the inner wall of the extended wing 32. Alternatively, the dovetail groove 33 and the dovetail seat 15 can be interchanged, that is, the dovetail groove 33 can be positioned on the outer wall of the wing 12, and the dovetail seat 15 can be positioned on the inner wall of the extended wing 32, achieving the same engaging effect. Furthermore, corresponding concave-convex engaging structures can be provided between the inner wall of the extended wing 32 and the outer wall of the wing 12, for example, one is a groove and the other is a convex strip, or one is a recess and the other is a protrusion; and the number is not limited to one set.

[0066] Before the extension sleeve 30 is fitted onto the support member 10, the connecting rod 40 can be positioned between the two blades 12 with its axis perpendicular to the first direction F1. The connecting rod 40 is supported by the support member 10.

[0067] Please see Figure 6 As shown, complete as follows Figure 4 After assembly as shown, install the locking screw 50 and locking screwdriver 60.

[0068] Please see Figures 6 to 9 As shown, the locking screwdriver 60 has a first axial end 61 and a second axial end 62 opposite to each other along its axial direction. The outer side wall of the first axial end 61 of the locking screwdriver 60 has a plurality of ribs 63. The length direction of each rib 63 is parallel to a first direction F1.

[0069] The locking screwdriver 60 has a first engaging section 64 in the shape of a round shaft at its first axial end 61. The first engaging section 64 protrudes from the plurality of ribs 63 parallel to the first direction F1. The end of the first engaging section 64 adjacent to the plurality of ribs 63 has a first outer diameter D1, and the other end of the first engaging section 64 away from the plurality of ribs 63 has a second outer diameter D2, which is smaller than the first outer diameter D1.

[0070] The locking screw 50 is ring-shaped and has a third axial end 53 and a fourth axial end 54 facing each other. The center of the locking screw 50 has a through portion 55 parallel to the first direction F1.

[0071] The inner wall of the locking screw 50 is provided with a plurality of grooves 51, the length direction of each groove 51 being parallel to the first direction F1. The outer wall of the locking screw 50 is provided with a second external thread 52.

[0072] A second engaging section 56 in the shape of a circular hole is provided in the third axial end 53 near the locking screw 50 within the through portion 55. The second engaging section 56 has a first inner diameter D3, which is smaller than the first outer diameter D1 and larger than the second outer diameter D2.

[0073] The locking screwdriver 60 is inserted parallel to the first direction F1 into the through portion 55 of the locking screw 50, with the first axial end 61 protruding beyond the third axial end 53. Each rib 63 engages with each groove 51. Due to the fit between the first inner diameter D3 (smaller than the first outer diameter D1) and the second outer diameter D2, the first engaging section 64 can pass through and engage with the second engaging section 56. The first engaging section 64 protrudes beyond the third axial end 53 by a length L, thus connecting the locking screwdriver 60 and the locking screw 50. The length L is, for example, in the range of 0.2 to 0.5 mm.

[0074] In other words, in addition to being used to screw the locking screw 50, the locking screw 60 provided by the present invention has a special first engagement section 64 and a second engagement section 56 between the locking screw 60 and the locking screw 50. Therefore, the locking screw 60 can perform a gripping function on the locking screw 50. After the locking screw 60 is inserted into the through portion 55 of the locking screw 50 parallel to the first direction F1, the locking screw 50 can be moved to the desired position by means of the locking screw 60, without the need for a separate tool to grip the locking screw 50.

[0075] Please see Figure 10 and Figure 11 As shown, the locking screwdriver 60 and the locking screw 50, which are already connected to each other, are then inserted into the extension sleeve 30. As mentioned above, the locking screwdriver 60 provided by the present invention can not only screw the locking screw 50, but also perform a gripping function on the locking screw 50. The locking screw 50 can be moved to the desired position by means of the locking screwdriver 60, without the need for a separate tool to grip the locking screw 50.

[0076] Then, the locking screwdriver 60 is driven to rotate, causing the locking screw 50 to rotate, so that the second external thread 52 engages with the first internal thread 14, and the connecting rod 40 is clamped between the locking screw 50 and the bottom 11.

[0077] Please see Figure 12 The diagram illustrates the working principle of the connection structure between the locking screwdriver and the locking screw provided by this invention. When the locking screwdriver 60 is rotated to engage the second external thread 52 with the first internal thread 14, the locking screw 50 can be screwed in downwards parallel to the first direction F1. When the locking screw 50 continues to move downwards until the first axial end 61 contacts the connecting rod 40 and the connecting rod 40 is pressed between the first axial end 61 and the recess 16, if the locking screwdriver 60 is continuously rotated, the locking screw 50 can continue to be screwed in downwards. However, since the first axial end 61 is blocked by the connecting rod 40 and cannot move downwards, it will be pushed upwards, thus disengaging the first engaging section 64 from the second engaging section 56.

[0078] Furthermore, when the locking screw 50 is driven by the locking screwdriver 60 to be pressed against the connecting rod 40, the locking screwdriver 60 will be pushed away by the connecting rod 40. This ensures that the locking screw 50 is indeed pressed against the connecting rod 40, preventing situations where the locking screw 50 is not properly tightened and the connecting rod 40 cannot be tightened, or where the locking screw 50 strips due to over-tightening of the locking screwdriver 60.

[0079] Complete as Figure 11 After the assembly shown, the locking screw 50 is secured, and the connecting rod 40 is firmly fixed between the support member 10 and the locking screw 50. Please refer to [further details]. Figure 1 , Figures 13 to 15 As shown, an extension sleeve release device 70 can be installed to remove the extension sleeve 30.

[0080] Please see Figure 1 , Figures 13 to 15 As shown, the extension sleeve release device 70 consists of a sleeve 71 and a handle 72. The handle 72 is in the shape of a round rod, and the axis of the handle 72 is perpendicular to the axis of the sleeve 71.

[0081] The sleeve 71 has a through portion 711 and a recessed portion 712 at its two axial ends. A handle 72 is provided at the axial end of the sleeve 71 with the recessed portion 712. The inner sidewall of the sleeve 71 has a second internal thread 713. When the sleeve 71 is fitted onto the extension sleeve 30, rotating the handle 72 (i.e., rotating the sleeve 71) allows the second internal thread 713 to engage with the first external thread 34.

[0082] Please see Figures 14 to 17 As shown, the extension sleeve ejector 70 is fitted over the extension sleeve 30. The handle 72 (i.e., the rotating sleeve 71) is rotated to engage the second internal thread 713 with the first external thread 34. The extension sleeve ejector 70 moves downward parallel to the first direction F1, so that the second axial end 62 of the locking screwdriver 60 abuts against the concave portion 712.

[0083] like Figure 16A As shown, the concave portion 712 is conical, and the second axial end portion 62 abuts against the concave portion 712 with its periphery. In addition, the second axial end portion 62 may also have other shapes, as long as the second axial end portion 62 and the concave portion 712 can abut against each other, whether it is full abutment, full circumferential abutment, single point abutment, single side abutment, multi-point abutment, or multi-sided abutment, and is not limited to the shape shown in the figure.

[0084] At this point, continuously rotating the handle 72 (i.e., rotating the sleeve 71) prevents the extension sleeve ejector 70 from descending further due to the resistance from the locking screwdriver 60. The extension sleeve 30 and the support member 10 are separably engaged by the dovetail groove 33 and the dovetail seat 15, thus allowing continuous engagement via the second internal thread 713 and the first external thread 34 (e.g., ...). Figure 16B As shown), the extension sleeve 30 is pulled upwards parallel to the first direction F1 by the extension sleeve release device 70, which eventually allows the extension sleeve 30 to detach from the two flaps 12 of the support member 10, as shown. Figure 17 As shown.

[0085] Then, subsequent surgical steps can be performed, including removing the locking screwdriver 60, breaking the broken piece 122 of the wing 12 at the groove 123, and so on.

[0086] In summary, the bone screw kit provided by this invention features a special relative movement design between the extension sleeve 30 and the support member 10, which are detachably engaged by the dovetail groove 33 and the dovetail seat 15. Furthermore, the specially designed locking screw and locking screw can effectively and appropriately tighten the spinal link without damaging the patient's surgical incision. This achieves the effects of simple structure, convenient operation, and no damage to the patient's surgical incision.

[0087] The above description is illustrative only and not restrictive of the present invention. Those skilled in the art will understand that many modifications, variations or equivalents can be made without departing from the spirit and scope defined by the claims, and all such modifications, variations or equivalents will fall within the protection scope of the present invention.

Claims

1. A bone screw kit, characterized in that, Include: A support member is composed of a bottom and two winglets. The bottom has a hole, and the two winglets protrude from the top surface of the bottom on both sides in a first direction. The inner sidewall of each winglet is provided with a first internal thread, and a recess is formed between the bottom and the two winglets. A screw having a threaded portion, the screw being pivotally mounted on the bottom, the threaded portion passing through the hole and protruding from the bottom surface of the bottom, the threaded portion being able to swing outside the bottom of the support member; An extension sleeve is composed of a connecting piece and two extension blades. The two extension blades are arranged parallel to the first direction on both sides of the connecting piece. The outer side wall of each extension blade is provided with a first external thread. The inner side wall of each extension blade and the outer side wall of each blade of the support member are provided with a locking structure that can engage with each other. The extension sleeve is sleeved on the two blades of the support member parallel to the first direction. The inner side wall of each extension blade and the corresponding locking structure of the outer side wall of each blade of the support member engage. A connecting rod, whose axis is perpendicular to the first direction, is disposed between the two blades of the support member; A locking screwdriver has a first axial end and a second axial end opposite each other along its axial direction. The outer wall of the first axial end of the locking screwdriver has a plurality of ribs, the length direction of each rib being parallel to the first direction. The first axial end of the locking screwdriver has a first engaging section that protrudes parallel to the first direction from the plurality of ribs. One end of the first engaging section adjacent to the plurality of ribs has a first outer diameter, and the other end of the first engaging section is away from the plurality of ribs and has a second outer diameter, the second outer diameter being smaller than the first outer diameter. A locking screw, ring-shaped, has a third axial end and a fourth axial end opposite to each other. The center of the locking screw has a through portion parallel to a first direction. The inner wall of the locking screw has a plurality of grooves, each groove's length direction being parallel to the first direction. The outer wall of the locking screw has a second external thread. Within the through portion, near the third axial end of the locking screw, there is a second engaging section. This second engaging section has a first inner diameter, which is smaller than the first outer diameter and larger than the third axial end. Two outer diameters; the first axial end of the locking screw is inserted into the through portion of the locking screw in parallel with the first direction, each rib is engaged between each groove, the first engaging section passes through and engages with the second engaging section, and the first engaging section protrudes beyond the third axial end by a length, so that the locking screw and the locking screw are connected, the locking screw is driven to rotate and drive the locking screw to rotate, so that the second external thread engages with the first internal thread, and the connecting rod is clamped between the locking screw and the bottom; An extension sleeve release device includes a sleeve with a through portion and a recess at each of its two axial ends. The inner sidewall of the sleeve has a second internal thread. The sleeve is fitted over the extension sleeve. The second internal thread engages with the first external thread. Continuous rotation of the sleeve causes the second axial end of the locking screwdriver to resist the recess and disengage the extension sleeve from the support member.

2. The bone screw kit as described in claim 1, characterized in that: The length of the first engaging section protruding from the third axial end is in the range of 0.2 to 0.5 mm.

3. The bone screw kit as described in claim 1, characterized in that, The engagement structure includes: The outer wall of each of the winglets of the support member is provided with a dovetail seat, the length extension direction of which is parallel to the first direction; and Each of the extended winglets has a dovetail groove on its inner sidewall, and the length of the dovetail groove extends parallel to the first direction; the extended sleeve is sleeved on the two winglets of the support member parallel to the first direction, and each dovetail groove is respectively engaged with a corresponding dovetail seat.

4. The bone screw kit as described in claim 3, characterized in that: Each of the winglets of the support member has a fixed piece and a broken piece parallel to the first direction. The fixed piece is connected to the bottom, and a groove is formed at the connection between the broken piece and the fixed piece.

5. The bone screw kit as described in claim 4, characterized in that: The dovetail seat of the outer side wall of each of the winglets of the support member is disposed on the fixing plate.

6. The bone screw kit as described in claim 4, characterized in that: The first internal thread extends to cover the inner wall of the fixing piece and the inner wall of the broken piece.

7. The bone screw kit as claimed in claim 1, characterized in that: The connecting piece of the extension sleeve has the same curvature as the two extension blades, and the extension sleeve forms a cylindrical structure.

8. The bone screw kit as claimed in claim 1, characterized in that: The first external thread of the outer sidewall of each of the extended winglets is provided at one end of each extended winglet near the connecting piece.

9. The bone screw kit as claimed in claim 1, characterized in that: The extension sleeve ejector includes a handle disposed at the axial end of the sleeve having the recess. Continuous rotation of the handle causes the second axial end of the locking screwdriver to resist the recess and disengage the extension sleeve from the two flaps of the support member.

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