Spinal severe deformity correction instrument and system

Abstract

The application discloses a kind of severe spinal deformity correction instrument and system, belong to medical instrument technical field, the severe spinal deformity correction instrument includes lifting screw holder and fixed screw holder, lifting screw holder is used to connect fixed to the pedicle screw of severe spinal deformity segment, lifting screw holder is equipped with lifting cross on it;Fixed screw holder is used to connect fixed to the pedicle screw of normal curvature segment of spine, and fixed screw holder is equipped with fixed cross on it;The side of lifting screw holder and fixed screw holder is equipped with the support rod of horizontal arrangement, and the severe spinal deformity correction instrument further includes connector.The severe spinal deformity correction instrument and system of the application can be suitable for severe spinal deformity disease, and power and accuracy can be controlled in operation process.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a device and system for correcting severe spinal deformities. Background Technology

[0002] Spinal deformities refer to abnormal changes in the morphology of the spine due to deviations from its normal position in the coronal, sagittal, and axial planes. A deformity angle greater than 90 degrees is considered severe, often accompanied by symptoms such as back stiffness, difficulty breathing, hip pain, and limited mobility. A deformity angle greater than 135 degrees is considered extremely severe. Patients with severe deformities typically exhibit several characteristics, including young age, early onset, rapid progression of the deformity, severe lung damage, physical weakness, stiffness due to the deformity, difficulty in correction, and high surgical risks.

[0003] Spinal deformities can be classified into scoliosis, kyphosis, etc. For more severe deformities, the only treatment option at present is surgery. Generally, spinal osteotomy is used for correction, combined with posterior internal fixation system. For particularly severe deformities, staged surgery is often required to minimize surgical complications and facilitate patient recovery, so as to further correct the deformity and the resulting loss of local function.

[0004] Traditional spinal deformity reduction involves fixing and traction or manually prying, spreading, and compressing the abnormal vertebrae during surgery to realign them. However, this method is often suitable for minor slippage, but it is difficult to restore severe deformities and dislocations. Furthermore, traditional orthopedic methods are not suitable for severe spinal deformities, and there are also problems with uncontrollable force and precision during the operation. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a spinal deformity correction device and system that can be applied to severe spinal deformities and whose force and precision can be controlled during operation.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] On the one hand, a severe spinal deformity correction device is provided, including a lifting screw holder and a fixed screw holder, wherein:

[0008] The lifting screw holder is used to connect and fix pedicle screws to the severely deformed segment of the spine. The lifting screw holder is provided with a lifting cross brace that can move along the axial direction of the lifting screw holder after being driven.

[0009] The fixed screw holder is used to connect and fix pedicle screws to segments of the spine with normal curvature, and the fixed screw holder is provided with a fixed cross brace.

[0010] The lifting screw holder and the fixed screw holder are provided with horizontally arranged support rods on their sides. The severe spinal deformity correction device also includes connectors for connecting the ends of the lifting crossbar and the fixed crossbar to the support rods respectively.

[0011] Furthermore, the lifting screw holder includes a threaded tube, the lower end of which is provided with a pair of first elastic arms, and the lower part of the threaded tube is fitted with a first sliding sleeve for driving the pair of first elastic arms to clamp the pedicle screw.

[0012] Furthermore, the lower inner side of the pair of first elastic arms is provided with a first limiting platform that cooperates with the lifting and repositioning grooves on both sides of the upper end of the pedicle screw;

[0013] And / or, the threaded tube is provided with a first sliding groove extending along its length, and the lower part of the threaded tube is provided with a pair of first retaining sleeve limiting grooves that are perpendicularly connected to the first sliding groove and spaced apart. The upper end of the first sliding retaining sleeve is provided with a first limiting stop that is slidably connected in the first sliding groove and cooperates with the first retaining sleeve limiting groove. When the first limiting stop is located in the first retaining sleeve limiting groove at the upper position, the pair of first elastic arms loosen the pedicle screw. When the first limiting stop is located in the first retaining sleeve limiting groove at the lower position, the pair of first elastic arms clamp the pedicle screw.

[0014] Furthermore, the lifting cross link includes a first cross link main sleeve for slidingly sleeved on the threaded pipe. The upper end of the first cross link main sleeve is axially positioned and rotatably fitted with a drive nut that is threadedly engaged with the threaded pipe. The outer side wall of the first cross link main sleeve is provided with a first fixing rod. The connector is used to connect the end of the first fixing rod to the support rod.

[0015] Furthermore, the upper outer surface of the first transverse main sleeve and the lower outer surface of the drive nut are both provided with connecting slots. The connecting slots of the first transverse main sleeve and the drive nut are provided with C-shaped retaining rings to axially position and rotatably assemble the drive nut onto the first transverse main sleeve.

[0016] And / or, the internal thread of the drive nut and the external thread of the threaded tube are both mating left-hand threads;

[0017] And / or, the drive nut is a regular polygon or a quincunx shape.

[0018] Furthermore, the severe spinal deformity correction device also includes a drive sleeve fitted on the lifting screw holder to drive the lifting screw holder to move relative to the lifting transverse link.

[0019] Furthermore, the drive sleeve includes a sleeve body for slidingly sleeved on the threaded tube, and the inner front end of the sleeve body is provided with a nut groove that cooperates with the drive nut of the lifting cross link. The drive sleeve can drive the drive nut to rotate relative to the threaded tube.

[0020] Furthermore, a drive handle is provided at the rear end of the sleeve body;

[0021] And / or, the sleeve body is provided with an indicator slot extending along its length;

[0022] And / or, the nut slot is a regular polygon or a quincunx shape.

[0023] Furthermore, the fixed screw holder includes a light tube, the lower end of which is provided with a pair of second elastic arms, and the lower part of the light tube is fitted with a second sliding sleeve for driving the pair of second elastic arms to clamp the pedicle screw.

[0024] Furthermore, the lower inner side of the pair of second elastic arms is provided with a second limiting platform that cooperates with the lifting and repositioning grooves on both sides of the upper end of the pedicle screw;

[0025] And / or, the light tube is provided with a second sliding groove extending along its length direction, and the lower part of the light tube is provided with a pair of second sleeve limiting grooves that are perpendicularly connected to the second sliding groove and spaced apart. The upper end of the second sliding sleeve is provided with a second limiting platform that is slidably connected in the second sliding groove and cooperates with the second sleeve limiting groove. When the second limiting platform is located in the upper part of the second sleeve limiting groove, the pair of second elastic arms loosen the pedicle screw. When the second limiting platform is located in the lower part of the second sleeve limiting groove, the pair of second elastic arms clamp the pedicle screw.

[0026] And / or, the fixed cross brace includes a second cross brace main sleeve for sleeved on the optical tube, a locking screw for pressing and fixing the optical tube is provided on the side wall of the second cross brace main sleeve, and a second fixing rod is also provided on the outer side wall of the second cross brace main sleeve, and the connector is used to connect the end of the second fixing rod to the support rod;

[0027] And / or, the severe spinal deformity correction device further includes an extension sleeve for fitting onto the optical tube, the inner hole of the extension sleeve including a large-diameter section at the lower part and a small-diameter section at the upper part, the inner diameter of the large-diameter section being greater than or equal to the outer diameter of the optical tube, and the inner diameter of the small-diameter section being less than the outer diameter of the optical tube, thereby forming a limiting platform at the connection between the large-diameter section and the small-diameter section for cooperating with the upper end of the optical tube.

[0028] Furthermore, the connector includes, from top to bottom, an upper female buckle, a male buckle, and a lower female buckle. The sides of the upper female buckle and the male buckle are respectively provided with mutually cooperating upper female buckle holding arc and upper male buckle holding arc, thereby forming an upper holding arc groove. The sides of the lower female buckle and the male buckle are respectively provided with mutually cooperating lower female buckle holding arc and lower male buckle holding arc, thereby forming a lower holding arc groove. The connector also includes a locking member for axially locking and fixing the upper female buckle, the male buckle, and the lower female buckle.

[0029] Furthermore, the male buckle includes an upper male buckle and a lower male buckle. The upper male buckle is provided with an upper male buckle holding arc, and the lower male buckle is provided with a lower male buckle holding arc. The upper male buckle and the lower male buckle are provided with meshing teeth on their opposite end faces.

[0030] And / or, both the upper male buckle holding rod arc and the lower male buckle holding rod arc are provided with at least two positioning teeth;

[0031] And / or, the mating end faces of the upper female buckle and the male buckle, as well as the mating end faces of the lower female buckle and the male buckle, are both L-shaped;

[0032] And / or, the axis of the upper holding rod groove intersects the axis of the lower holding rod groove.

[0033] Furthermore, the locking element includes a locking bolt that passes sequentially through the upper female buckle, the male buckle, and the lower female buckle and is threadedly connected to the lower female buckle, wherein:

[0034] The lower end of the locking bolt is provided with a bolt base nail, and the lower end of the lower nut is provided with a bolt base nail clearance hole;

[0035] And / or, the shank of the locking bolt is fitted with a drive ring above the upper female buckle, the upper end of the upper female buckle is provided with a drive ring groove, and the lower surface of the drive ring and the inner surface of the drive ring groove are mutually mating spherical or inclined surfaces.

[0036] Furthermore, the severe spinal deformity correction device also includes an unlocker for unlocking the lifting screw holder or the fixed screw holder, the unlocker being able to drive the first sliding sleeve or the second sliding sleeve to rotate, thereby separating the first elastic arm or the second elastic arm from the pedicle screw.

[0037] Furthermore, the unlocking device includes a drive cap, a connecting arm, and a sliding stop arm connected sequentially from top to bottom. The drive cap has a through hole for the threaded tube or the light tube to pass through, and the sliding stop arm has a lifting groove for cooperating with the first limiting stop or the second limiting stop, wherein:

[0038] The lower end of the sliding stop arm is provided with a stop entrance that communicates with the middle of the lifting groove, thereby forming a lifting arm on each of the left and right sides below the lifting groove.

[0039] And / or, the connecting arm, from top to bottom, includes a straight arm segment and an inwardly inclined oblique arm segment.

[0040] On the other hand, a severe spinal deformity correction system is provided, including pedicle screws and the aforementioned severe spinal deformity correction device, wherein the pedicle screws are unidirectional screws or universal screws.

[0041] The present invention has the following beneficial effects:

[0042] The present invention provides a spinal deformity correction device, comprising a lifting screw holder for connecting and fixing pedicle screws to the severely deformed spinal segment and a fixed screw holder for connecting and fixing pedicle screws to the normal curvature spinal segment. The lifting screw holder and the fixed screw holder are respectively provided with a lifting crossbar and a fixed crossbar. The spinal deformity correction device also includes connectors for connecting the lifting crossbar and the fixed crossbar to a horizontally positioned support rod. Compared with the prior art, the device has a simple and practical structure, is easy to operate, highly adaptable, and has a high safety factor. It is applicable to severe spinal deformities, and the force and precision during operation are controllable, enabling treatment such as straightening and derotation of severe spinal deformities. Attached Figure Description

[0043] Figure 1 A schematic diagram of the physiological curvature of the human spine in a normal human body;

[0044] Figure 2 A schematic diagram of the physiological curvature of the spine in a patient with severe spinal deformity;

[0045] Figure 3 This is a schematic diagram of the overall structure of the severe spinal deformity correction system of the present invention;

[0046] Figure 4 for Figure 3 Top view;

[0047] Figure 5 for Figure 3 The left view;

[0048] Figure 6 for Figure 3A schematic diagram of the structure of a lifting screw holder, wherein (a) is a front view, (b) is a sectional view of (a), and (c) is a side view of (a);

[0049] Figure 7 for Figure 3 A schematic diagram of the lifting and lowering crossbar structure, where (a) is a three-dimensional view and (b) is a front sectional view of (a);

[0050] Figure 8 for Figure 3 A schematic diagram of the structure of the drive sleeve, wherein (a) is a perspective view in one direction and (b) is a perspective view in another direction;

[0051] Figure 9 for Figure 3 A schematic diagram of a fixed screw holder, wherein (a) is a front view, (b) is a sectional view of (a), and (c) is a side view of (a);

[0052] Figure 10 for Figure 3 A schematic diagram of the fixed horizontal bracing structure, where (a) is a three-dimensional view in one direction and (b) is a three-dimensional view in another direction;

[0053] Figure 11 for Figure 3 A schematic diagram of the structure of the extension sleeve, where (a) is a front view and (b) is a sectional view of (a);

[0054] Figure 12 for Figure 3 The structural diagram of the connector is shown in the figure. (a) is a front view in one direction, (b) is a cross-sectional view of (a), (c) is a front view in another direction, (d) is a cross-sectional view of (c), (e) is a top view of (a), and (f) is a bottom view of (a).

[0055] Figure 13 for Figure 3 A schematic diagram of the structure of the unlocker, where (a) is a perspective view and (b) is a side view of (a);

[0056] Figure 14 for Figure 3 The diagram shows the structure of the pedicle screw in the middle vertebra as a unidirectional screw, where (a) is the front view of the short tail screw, (b) is the side view of (a), (c) is the front view of the long tail screw, and (d) is the side view of (c).

[0057] Figure 15 for Figure 3 The diagram shows the structure of the pedicle screw in the middle vertebra, where (a) is the front view of the short tail screw, (b) is the side view of (a), (c) is the front view of the long tail screw, and (d) is the side view of (c).

[0058] Figure 16 This is a schematic diagram illustrating the operating principle of the severe spinal deformity correction system of the present invention. Detailed Implementation

[0059] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0060] The normal physiological curvature of the human spine is as follows: Figure 1 As shown, the physiological curvature of the spine in patients with severe spinal deformities is as follows: Figure 2 As shown, patients in this situation mostly suffer in their daily lives. Currently, there are no corrective devices on the market specifically designed to address and treat severe spinal deformities, or the existing corrective devices for treating severe spinal deformities are complex in structure and cumbersome to operate, causing great inconvenience to medical personnel and increasing the risks to patients during surgery.

[0061] On the one hand, the present invention provides a device for correcting severe spinal deformities, such as Figure 3-16 As shown, it includes a lifting screw holder 1 and a fixed screw holder 2, wherein:

[0062] The lifting screw holder 1 is used to connect and fix the pedicle screw 3 to the segment of the spine with severe deformity. The lifting screw holder 1 is provided with a lifting cross link 4 that can move along the axial direction of the lifting screw holder 1 after being driven.

[0063] The fixed screw holder 2 is used to connect and fix the pedicle screw 3 to the segment with normal spinal curvature. The fixed screw holder 2 is provided with a fixed cross brace 5.

[0064] The lifting screw holder 1 and the fixed screw holder 2 are provided with horizontally arranged support rods 6 on their sides. The severe spinal deformity correction device also includes connectors 7 for connecting the ends of the lifting crossbar 4 and the fixed crossbar 5 to the support rods 6 respectively.

[0065] Furthermore, the severe spinal deformity correction device may also include a drive sleeve 8 that is fitted on the lifting screw holder 1 and drives the lifting screw holder 1 to move relative to the lifting transverse link 4.

[0066] In use, firstly, pedicle screws 3 are inserted into the vertebral body of the patient's severely deformed segment and the adjacent normal segment before and after the severely deformed segment. Then, the lifting screw holder 1 is connected and fixed to the pedicle screw 3 in the severely deformed segment of the spine, preparing for the subsequent severe deformity reduction operation. The fixed screw holder 2 is then connected and fixed to the pedicle screw 3 in the segment with normal spinal curvature, serving as support for the vertebral body in the severely deformed segment of the spine. Next, the lifting crossbar 4 and the fixed crossbar 5 are connected to the lifting screw holder 1 and the fixed screw holder 2, respectively. Connector 7 is used to connect the ends of the lifting crossbar 4 and the fixed crossbar 5 to the horizontally positioned support rod 6. Then, the drive sleeve 8 is fitted onto the lifting screw holder 1 and driven to move relative to the lifting crossbar 4, thereby moving the pedicle screw 3 fixed to the lifting screw holder 1 (see...). Figure 16 (In the direction of the middle arrow) to perform the repositioning operation, and finally pass the shaped connecting rod (such as a titanium rod) through the U-shaped groove 32 of the pedicle screw 3's base 31, and lock the connecting rod with the screw plug of the pedicle screw 3 (specifically, the screw plug can be held by a tool and passed through the inner hole of the lifting screw holder 1, the fixed screw holder 2, the extension sleeve 9 and the drive sleeve 8 to lock and fix it into the U-shaped groove 32 of the pedicle screw 3), so that the pedicle screw 3 and the connecting rod are finally fixed in the normal physiological curvature of the spine (that is, the pedicle screw 3 and the connecting rod are combined to form a conventional spinal screw-rod system).

[0067] This invention relates to a severe spinal deformity correction device, comprising a lifting screw holder for connecting and fixing pedicle screws to the severely deformed spinal segment, and a fixed screw holder for connecting and fixing pedicle screws to the normal spinal curvature segment. The lifting and fixed screw holders are respectively equipped with a lifting crossbar and a fixed crossbar. The device also includes connectors for connecting the lifting and fixed crossbars to a horizontally positioned support rod. Compared to existing technologies, this device is simple and practical in structure, easy to operate, highly adaptable, and has a high safety factor. It is suitable for severe spinal deformities, and the force and precision during operation are controllable, enabling treatment such as straightening and derotation of severe spinal deformities. This invention is applicable to spinal correction surgery, especially for severe deformity surgery.

[0068] The spinal deformity correction device of the present invention has a simple and practical structure, works smoothly with instruments and tools, and has a high safety factor. It can not only meet the treatment needs of patients with severe spinal deformities, but can also be used for routine spinal slip, scoliosis and other corrective surgeries.

[0069] The lifting screw holder 1 can adopt various structural forms readily conceived by those skilled in the art, such as a conventional pedicle screw holding sleeve. However, for ease of implementation, the present invention preferably adopts the following structural form:

[0070] like Figure 6 As shown, the lifting screw holder 1 may include a threaded tube 11, with a pair of first elastic arms 12 at the lower end of the threaded tube 11. A first sliding sleeve 13 for driving the pair of first elastic arms 12 to clamp the pedicle screw 3 is sleeved on the lower part of the threaded tube 11. The lower inner side of the pair of first elastic arms 12 may be provided with a first limiting platform 14 that cooperates with the lifting and resetting grooves 34 on both sides of the upper end of the pedicle screw 3 to better clamp and fix the pedicle screw 3.

[0071] The threaded tube 11 may be provided with a first sliding groove 15 extending along its length. The lower part of the threaded tube 11 is provided with a pair of first retaining sleeve limiting grooves 16 that are vertically connected to the first sliding groove 15 and spaced apart. The upper end of the first sliding retaining sleeve 13 is provided with a first limiting platform (specifically a spring-loaded pin) 17 that is slidably connected in the first sliding groove 15 and cooperates with the first retaining sleeve limiting groove 16. When the first limiting platform 17 is located in the upper part of the first retaining sleeve limiting groove 16, a pair of first elastic arms 12 loosen the pedicle screw 3. When the first limiting platform 17 is located in the lower part of the first retaining sleeve limiting groove 16 (this limiting groove is located to the left of the first limiting platform 17 in the figure and is obscured and not shown), a pair of first elastic arms 12 clamp the pedicle screw 3, which facilitates the limiting of the first sliding retaining sleeve 13. With the pair of first elastic arms 12 in a state of releasing / clamping the pedicle screw 3, the pair of first retaining sleeve limiting grooves 16 and the first limiting stop 17 cooperate to prevent the first sliding sleeve 13 from moving axially, thereby achieving better release / clamping of the pedicle screw 3. The pair of first retaining sleeve limiting grooves 16 and the first sliding groove 15 between them preferably form a Z-shaped structure for easy operation.

[0072] In use, before placing the pair of first elastic arms 12 of the lifting screw holder 1 onto the pedicle screw 3's base 31, first pull the first sliding sleeve 13 upward along the first sliding groove 15 and rotate it (left) into the upper first sleeve limiting groove 16. Then, with the elastic arms 12 in the open position, place the pair of first elastic arms 12 onto the pedicle screw 3's base 31, so that the first limiting platform 14 is engaged in the lifting reset groove 34 of the base 31. Then push the first sliding sleeve 13 downward along the first sliding groove 15 and rotate it (right) into the lower first sleeve limiting groove 16. The pair of first elastic arms 12 elastically contract and clamp the pedicle screw 3.

[0073] The lifting cross brace 4 can move along the axial direction of the lifting screw holder 1. The two can be connected by a sleeve. For ease of operation, the following structural form is preferred:

[0074] like Figure 7As shown, the lifting cross link 4 may include a first cross link main sleeve 41 for slidingly sleeved on the threaded tube 11. The upper end of the first cross link main sleeve 41 is axially positioned and rotatably mounted with a drive nut 42 that is threadedly engaged with the threaded tube 11. The outer side wall of the first cross link main sleeve 41 is provided with a first fixing rod 43. The connector 7 is used to connect the end of the first fixing rod 43 to the support rod 6. In this way, during the process of driving the lifting cross link 4 to move along the axial direction of the lifting screw holder 1, the force and precision of the threaded assembly are more controllable during operation, so as to better perform the reset operation.

[0075] Here, the drive nut 42 is axially positioned and circumferentially rotatable, and is mounted on the first transverse main sleeve 41. Specifically, it can adopt the following structural form:

[0076] Both the upper outer surface of the first horizontal connecting main sleeve 41 and the lower outer surface of the driving nut 42 can be provided with connecting grooves 44. The connecting grooves 44 of the first horizontal connecting main sleeve 41 and the connecting grooves 44 of the driving nut 42 are provided with retaining rings 45 with a C-shaped cross section, so as to axially position the driving nut 42 and rotatably assemble it on the first horizontal connecting main sleeve 41.

[0077] The internal thread of the drive nut 42 and the external thread of the threaded tube 11 can be mutually mating left-hand threads, which is convenient for the surgeon's operating habits during surgery. During the operation, the surgeon can rotate the drive nut 42 clockwise as usual, thereby moving the lifting screw holder 1 downward (pressing down on the protruding part of the spine), and then moving the severely deformed vertebra connected and fixed by the lifting screw holder 1 towards the normal physiological curvature of the spine. After the normal physiological curvature is restored, the rotation of the drive nut 42 is stopped. The drive nut 42 can be a regular polygon or a quincunx shape.

[0078] The drive sleeve 8 is used to mount the lifting screw holder 1 and drive the lifting screw holder 1 to move relative to the lifting cross brace 4. The following structural form is preferred:

[0079] like Figure 8As shown, the drive sleeve 8 may include a sleeve body 81 for slidingly fitting onto the threaded tube 11. The inner front end of the sleeve body 81 has a nut groove 82 that engages with the drive nut 42 of the lifting cross brace 4. The drive sleeve 8 can drive the nut 42 to rotate relative to the threaded tube 11. In the embodiment shown, the sleeve body 81 has a screw hole 83 inside. In use, the screw hole 83 of the drive sleeve 8 is inserted into the threaded tube 11 of the lifting screw holder 1 until the nut groove 82 is fitted onto the drive nut 42. The rear end of the sleeve body 81 may have a drive handle 84 for easy hand operation. The sleeve body 81 may have an indicator slot 85 extending along its length to facilitate observation of the movement distance / position of the threaded tube 11. The nut groove 82 can be a regular polygon or a star shape; whatever shape it is, it must match and engage with the shape of the drive nut 42.

[0080] In this invention, the drive sleeve 8 is sleeved on the lifting screw holder 1 to drive the lifting screw holder 1 to move relative to the lifting cross link 4. In order to achieve this function, in addition to the above-mentioned cooperation method, the lifting screw holder 1, the lifting cross link 4 and the drive sleeve 8 can also adopt various other methods that are easy for those skilled in the art to think of. For example, the lifting cross link 4 and the lifting screw holder 1 are simply sleeved (without threaded connection). The drive sleeve 8 can clamp and fix the lifting cross link 4 on the one hand, and has a push rod on the other hand, which can push the lifting screw holder 1 to move.

[0081] The fixed screw holder 2 can adopt various structural forms readily conceived by those skilled in the art, such as a conventional pedicle screw holding sleeve. However, for ease of implementation, the present invention preferably adopts the following structural form:

[0082] like Figure 9 As shown, the fixed screw holder 2 may include a light tube 21. The lower end of the light tube 21 is provided with a pair of second elastic arms 22. The lower part of the light tube 21 is fitted with a second sliding sleeve 23 for driving the pair of second elastic arms 22 to clamp the pedicle screw 3. The lower inner side of the pair of second elastic arms 22 may be provided with a second limiting platform 24 that cooperates with the lifting and repositioning grooves 34 on both sides of the upper end of the pedicle screw 3 to better clamp and fix the pedicle screw 3.

[0083] The light tube 21 may be provided with a second sliding groove 25 extending along its length. The lower part of the light tube 21 is provided with a pair of second retaining sleeve limiting grooves 26 perpendicularly connected to the second sliding groove 25 and spaced apart. The upper end of the second sliding retaining sleeve 23 is provided with a second limiting platform (specifically, a spring-loaded pin) 27 slidably connected within the second sliding groove 25 and cooperating with the second retaining sleeve limiting groove 26. When the second limiting platform 27 is located in the upper part of the second retaining sleeve limiting groove 26, a pair of second elastic arms 22 loosen the pedicle screw 3. When the second limiting platform 27 is located in the lower part of the second retaining sleeve limiting groove 26, a pair of second elastic arms 22 clamp the pedicle screw 3, facilitating the limiting of the second sliding retaining sleeve 23. In the state where the pair of second elastic arms 22 loosen / clamp the pedicle screw 3, the cooperation of the pair of second retaining sleeve limiting grooves 26 and the second limiting platform 27 prevents axial movement of the second sliding retaining sleeve 23, thus effectively achieving the loosening / clamping of the pedicle screw 3. The pair of second retaining sleeve limiting grooves 26 and the second sliding groove 25 between them preferably form a Z-shaped structure to facilitate operation.

[0084] In use, before placing the pair of second elastic arms 22 of the fixed screw holder 2 onto the pedicle screw 3's base 31, first pull the second sliding sleeve 23 upward along the second slide groove 25 and rotate it (left) into the upper position of the second sleeve limiting groove 26. Then, with the elastic arms 22 in the open position, place the pair of second elastic arms 22 onto the pedicle screw 3's base 31, so that the second limiting platform 24 is engaged in the lifting and resetting groove 34 of the base 31. Then, push the second sliding sleeve 23 downward along the second slide groove 25 and rotate it (right) into the lower position of the second sleeve limiting groove 26. The pair of second elastic arms 22 elastically contract and clamp the pedicle screw 3.

[0085] The fixed crossbar 5 is used to fix it to the fixed screw holder 2, and preferably adopts the following structural form:

[0086] like Figure 10 As shown, the fixed cross brace 5 may include a second cross brace main sleeve 51 for sleeved on the optical tube 21. A locking screw 52 for pressing and fixing the optical tube 21 is provided on the side wall of the second cross brace main sleeve 51. A second fixing rod 53 is also provided on the outer side wall of the second cross brace main sleeve 51. A connector 7 is used to connect the end of the second fixing rod 53 to the support rod 6. In the embodiment shown in the figure, the second cross brace main sleeve 51 has a light column hole 54 inside. In use, the second cross brace main sleeve 51 is sleeved on the optical tube 21 along the light column hole 54, and then the optical tube 21 is pressed and fixed using the locking screw 52.

[0087] like Figure 11As shown, the spinal deformity correction device of the present invention may further include an extension sleeve 9 for fitting onto the optical tube 21. The inner hole of the extension sleeve 9 includes a large-diameter section 91 at the lower part and a small-diameter section 92 at the upper part. The inner diameter of the large-diameter section 91 is greater than or equal to the outer diameter of the optical tube 21, and the inner diameter of the small-diameter section 92 is smaller than the outer diameter of the optical tube 21. Thus, a limiting platform 93 for cooperating with the upper end of the optical tube 21 is formed at the connection between the large-diameter section 91 and the small-diameter section 92, so as to extend the optical tube 21 and facilitate intraoperative operation. After the connector 7 connects the lifting crossbar 4 and the fixing crossbar 5 to the horizontally arranged support rod 6 respectively, the large-diameter section 91 of the extension sleeve 9 can be fitted onto the optical tube 21 of the fixed screw holder 2. When the optical tube 21 reaches the limiting platform 93, the hole and shaft complete the maximum contact.

[0088] Connector 7 is used to connect the ends of lifting crossbar 4 and fixed crossbar 5 to support rod 6 respectively. It can adopt various structural forms that are easy for those skilled in the art to conceive of, such as using elastic clips or even using locking pins, straps, etc. However, for ease of implementation, the following structural form is preferred:

[0089] like Figure 12 As shown, the connector 7 can include an upper female buckle 71, a male buckle, and a lower female buckle 72 from top to bottom. The sides of the upper female buckle 71 and the male buckle are respectively provided with mutually cooperating upper female buckle holding arc 711 and upper male buckle holding arc 731, thereby forming an upper holding arc groove. The sides of the lower female buckle 72 and the male buckle are respectively provided with mutually cooperating lower female buckle holding arc 721 and lower male buckle holding arc 741, thereby forming a lower holding arc groove. The connector 7 also includes a locking member for axially locking and fixing the upper female buckle 71, the male buckle, and the lower female buckle 72, so as to connect the first fixing rod 43 of the lifting cross link 4 and the second fixing rod 53 of the fixing cross link 5 to the support rod 6 respectively.

[0090] Furthermore, the male fastener may include an upper male fastener 73 and a lower male fastener 74. The upper male fastener 73 has an upper male fastener holding arc 731, and the lower male fastener 74 has a lower male fastener holding arc 741. Engaging teeth 75 are provided on the opposite end faces of the upper male fastener 73 and the lower male fastener 74. The engaging teeth 75 are a unique feature of the male fastener. When the connector 7 is axially locked, the engaging teeth 75 between the upper male fastener 73 and the lower male fastener 74 engage with each other, thereby fixing the relative position of the two male fasteners and eliminating rotational degrees of freedom, thus initially fixing the relative position of the two male fasteners. At least two positioning teeth 76 may be provided within both the upper male fastener holding arc 731 and the lower male fastener holding arc 741, which can increase the biting force when locking the fixing rod / support rod 6, making the lock tighter and more secure. The mating end faces of the upper female buckle 71 and the male buckle, as well as the mating end faces of the lower female buckle 72 and the male buckle, can both be L-shaped. This not only provides mutual positioning but also prevents damage caused by excessive force between the male and female buckles. The axes of the upper and lower holding rod grooves can intersect, for example, at an angle range of 60-120 degrees, to facilitate use during surgery.

[0091] The locking mechanism preferably adopts the following structural form:

[0092] The locking component may include a locking bolt 77 that passes sequentially through the upper female thread 71, the male thread, and the lower female thread 72 and is threadedly connected to the lower female thread 72. The upper end of the locking bolt 77 may have a bolt drive groove 771 to facilitate driving the locking bolt 77. The bolt drive groove 771 may be a regular polygon or a star-shaped groove. The lower end of the locking bolt 77 may have a bolt base screw 78, and the lower end of the lower female thread 72 has a bolt base screw clearance hole 722 for accommodating the bolt base screw 78. The bolt base screw 78 acts as a limiting screw for the locking bolt 77, ensuring that the locking bolt 77 does not come out of the male and female threads during the locking of the connector 7. The bolt base screw clearance hole 722 allows the bolt base screw 78 to move within the clearance hole 722 during the locking / unlocking process of the locking bolt 77, satisfying the structural function while also concealing the bolt base screw 78 to reduce the size of the connector 7. The lower end of the bolt base screw 78 may be provided with a bolt drive hole 781 to facilitate driving the bolt base screw 78. The bolt drive hole 781 may be in the form of two holes or multiple holes, mainly to distinguish it from conventional tools and prevent it from being accidentally removed after assembly.

[0093] The shank of the locking bolt 77 can be fitted with a drive ring 79 above the upper female buckle 71. The upper end of the upper female buckle 71 is provided with a drive ring groove 712. The lower surface of the drive ring 79 and the inner surface of the drive ring groove 712 are mutually mating spherical or inclined surfaces. In this way, when the locking bolt 77 is driven to lock the connector 7, the locking is achieved by the cooperation of the two spherical / inclined surfaces of the drive ring 79 and the drive ring groove 712, resulting in a larger contact area and more uniform force distribution.

[0094] In use, first place the first fixing rod 41 of the lifting cross link 4 and the second fixing rod 51 of the fixing cross link 5 into the upper holding rod grooves of the two connectors 7 respectively, then place the support rod 6 into the lower holding rod grooves of the two connectors 7, and finally drive the locking bolt 77 to lock the connector 7, so as to assemble the lifting cross link 4, the fixing cross link 5 and the support rod 6 into an integral structure; before locking the connector 7, first screw the thread of the lifting cross link 4 to the appropriate position of the threaded tube 11, and put the fixing cross link 5 on the light tube 21 so that the fixing cross link 5 and the lifting cross link 4 are on the same horizontal plane.

[0095] like Figure 13 As shown, the spinal deformity correction device of the present invention may further include an unlocker 10 for unlocking the lifting screw holder 1 or the fixed screw holder 2. The unlocker 10 can drive the first sliding sleeve 13 or the second sliding sleeve 23 to rotate, thereby separating the first elastic arm 12 or the second elastic arm 22 from the pedicle screw 3.

[0096] The unlocker 10 preferably adopts the following structural form:

[0097] The unlocker 10 may include a drive cap 101, a connecting arm 102 and a sliding stop arm 103 connected from top to bottom. The drive cap 101 is provided with a through hole 104 (a light hole is sufficient) for the threaded tube 11 or the light tube 21 to pass through. The sliding stop arm 103 is provided with a lifting groove 105 for cooperating with the first limiting stop 17 or the second limiting stop 27 to facilitate unlocking the lifting screw holder 1 or the fixed screw holder 2. The lower end of the sliding stop arm 103 may be provided with a stop entrance 106 that communicates with the middle of the lifting groove 105, thereby forming a lifting arm 107 on each of the left and right sides below the lifting groove 105. The stop entrance 106 can facilitate the entry of the first limiting stop 17 or the second limiting stop 27 into the lifting groove 105, and the lifting arm 107 can be easily lifted. The connecting arm 102 may include a straight arm section and an inwardly inclined oblique arm section from top to bottom. Since the drive cap 101, the connecting arm 102 and the sliding stop arm 103 are all rotating bodies, this design can prevent interference during operation.

[0098] After the spinal reduction operation is completed, remove the drive sleeve 8 and the extension sleeve 9. First, put the drive cap 101 on the threaded tube 11 or the smooth tube 21, so that the first limiting stop 17 or the second limiting stop 27 enters the lifting groove 105 along the stop inlet 106. Rotate the drive cap 101 in the opposite direction so that the limiting stop slides out of the lower limiting groove and slides along the groove to the upper limiting groove. Then, remove the lifting screw holder 1 and the fixed screw holder 2 fixed on the pedicle screw 3 base 31 to complete the surgical operation.

[0099] On the other hand, the present invention provides a severe spinal deformity correction system, including pedicle screws 3 and the aforementioned severe spinal deformity correction device. Since the structure of the severe spinal deformity correction device is the same as above, it will not be described again here.

[0100] The spinal deformity correction system of the present invention includes a lifting screw holder for connecting and fixing pedicle screws to the severely deformed segment of the spine and a fixed screw holder for connecting and fixing pedicle screws to the segment with normal spinal curvature. The lifting screw holder and the fixed screw holder are respectively provided with a lifting crossbar and a fixed crossbar. The spinal deformity correction device also includes connectors for connecting the lifting crossbar and the fixed crossbar to a horizontally arranged support rod. Compared with the prior art, it has a simple and practical structure, is easy to operate, has strong adaptability, and a high safety factor. It can be applied to severe spinal deformity diseases, and the force and precision can be controlled during operation. It can achieve treatment such as straightening and derotation of severe spinal deformities.

[0101] like Figure 14-15 As shown, the pedicle screw 3 can be a one-way screw or a universal screw. The shank 35 of the one-way screw and the screw seat 31 are an integral structure. The shank 35 of the universal screw can swing around the screw seat 31 in any direction. When the screw plug is locked to fix the connecting rod, the shank 35 can be fixed. Whether it is a one-way screw or a universal screw, it can be divided into short tail screws and long tail screws.

[0102] Furthermore, the front section of the screw rod 35 can have a single-threaded (e.g., single-threaded) thread 36. After being driven into the vertebral body, it can act as a tap to prepare for the insertion of the multi-threaded (e.g., double-threaded, triple-threaded, quadruple-threaded, etc.) thread 37 in the rear section of the screw rod 35. The multi-threaded thread 37 can increase the contact area with the bone in the cortical bone layer of the vertebral body, thereby increasing the pull-out resistance of the pedicle screw 3 in the vertebral body. The lower end of the screw seat 31 can be provided with an outer circle 38 to prevent the pedicle screw 3 screw rod 35 from being driven too deeply into the vertebral body.

[0103] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A severe spinal deformity correction instrument, comprising: Including lifting screw holders and fixed screw holders, among which: The lifting screw holder is used to connect and fix pedicle screws to the severely deformed segment of the spine. The lifting screw holder is provided with a lifting cross brace that can move along the axial direction of the lifting screw holder after being driven. The fixed screw holder is used to connect and fix pedicle screws to segments of the spine with normal curvature, and the fixed screw holder is provided with a fixed cross brace. The lifting screw holder and the fixed screw holder are provided with horizontally arranged support rods on their sides. The severe spinal deformity correction device also includes connectors for connecting the ends of the lifting crossbar and the fixed crossbar to the support rods respectively. The lifting screw holder includes a threaded tube, the lower end of which is provided with a pair of first elastic arms, and the lower part of the threaded tube is fitted with a first sliding sleeve for driving the pair of first elastic arms to clamp the pedicle screw. The lifting cross link includes a first cross link main sleeve for slidingly sleeved on the threaded pipe. The upper end of the first cross link main sleeve is axially positioned and rotatably fitted with a drive nut that is threaded to the threaded pipe. The outer side wall of the first cross link main sleeve is provided with a first fixing rod. The connector is used to connect the end of the first fixing rod to the support rod.

2. The severe spinal deformity correction instrument of claim 1, wherein, The lower inner side of the pair of first elastic arms is provided with a first limiting platform that cooperates with the lifting and repositioning grooves on both sides of the upper end of the pedicle screw. And / or, the threaded tube is provided with a first sliding groove extending along its length, and the lower part of the threaded tube is provided with a pair of first retaining sleeve limiting grooves that are perpendicularly connected to the first sliding groove and spaced apart. The upper end of the first sliding retaining sleeve is provided with a first limiting stop that is slidably connected in the first sliding groove and cooperates with the first retaining sleeve limiting groove. When the first limiting stop is located in the first retaining sleeve limiting groove at the upper position, the pair of first elastic arms loosen the pedicle screw. When the first limiting stop is located in the first retaining sleeve limiting groove at the lower position, the pair of first elastic arms clamp the pedicle screw.

3. The severe spinal deformity correction instrument of claim 1, wherein, Both the upper outer surface of the first transverse main sleeve and the lower outer surface of the drive nut are provided with connecting slots. The connecting slots of the first transverse main sleeve and the drive nut are provided with C-shaped retaining rings to axially position and rotatably assemble the drive nut onto the first transverse main sleeve. And / or, the internal thread of the drive nut and the external thread of the threaded tube are both mating left-hand threads; And / or, the drive nut is a regular polygon or a quincunx shape.

4. The severe spinal deformity correction instrument of claim 1, wherein, The severe spinal deformity correction device also includes a drive sleeve fitted on the lifting screw holder to drive the lifting screw holder to move relative to the lifting transverse link.

5. The severe spinal deformity correction instrument of claim 4, wherein, The drive sleeve includes a sleeve body for slidingly sleeved on the threaded tube. The inner front end of the sleeve body is provided with a nut groove that cooperates with the drive nut of the lifting cross brace. The drive sleeve can drive the drive nut to rotate relative to the threaded tube.

6. The severe spinal deformity correction instrument of claim 5, wherein, A drive handle is provided at the rear end of the sleeve body; And / or, the sleeve body is provided with an indicator slot extending along its length; And / or, the nut slot is a regular polygon or a quincunx shape.

7. The severe spinal deformity correction instrument of claim 1, wherein, The fixed screw holder includes a light tube, the lower end of which is provided with a pair of second elastic arms, and the lower part of the light tube is fitted with a second sliding sleeve for driving the pair of second elastic arms to clamp the pedicle screw.

8. The severe spinal deformity correction instrument of claim 7, wherein, The lower inner side of the pair of second elastic arms is provided with a second limiting platform that cooperates with the lifting and repositioning grooves on both sides of the upper end of the pedicle screw; And / or, the light tube is provided with a second sliding groove extending along its length direction, and the lower part of the light tube is provided with a pair of second retaining sleeve limiting grooves that are perpendicularly connected to the second sliding groove and spaced apart. The upper end of the second sliding sleeve is provided with a second limiting stop that is slidably connected in the second sliding groove and cooperates with the second retaining sleeve limiting groove. When the second limiting stop is located in the upper part of the second retaining sleeve limiting groove, the pair of second elastic arms loosen the pedicle screw. When the second limiting stop is located in the lower part of the second retaining sleeve limiting groove, the pair of second elastic arms clamp the pedicle screw. And / or, the fixed cross brace includes a second cross brace main sleeve for sleeved on the optical tube, a locking screw for pressing and fixing the optical tube is provided on the side wall of the second cross brace main sleeve, and a second fixing rod is also provided on the outer side wall of the second cross brace main sleeve, and the connector is used to connect the end of the second fixing rod to the support rod; And / or, the severe spinal deformity correction device further includes an extension sleeve for fitting onto the optical tube, the inner hole of the extension sleeve including a large-diameter section at the lower part and a small-diameter section at the upper part, the inner diameter of the large-diameter section being greater than or equal to the outer diameter of the optical tube, and the inner diameter of the small-diameter section being less than the outer diameter of the optical tube, thereby forming a limiting platform at the connection between the large-diameter section and the small-diameter section for cooperating with the upper end of the optical tube.

9. The severe spinal deformity correction instrument of claim 1, wherein, The connector comprises, from top to bottom, an upper female buckle, a male buckle, and a lower female buckle. The sides of the upper female buckle and the male buckle are respectively provided with mutually cooperating upper female buckle holding arc and upper male buckle holding arc, thereby forming an upper holding arc groove. The sides of the lower female buckle and the male buckle are respectively provided with mutually cooperating lower female buckle holding arc and lower male buckle holding arc, thereby forming a lower holding arc groove. The connector also includes a locking member for axially locking and fixing the upper female buckle, the male buckle, and the lower female buckle.

10. The severe spinal deformity correction instrument of claim 9, wherein, The male buckle includes an upper male buckle and a lower male buckle. The upper male buckle is provided with an upper male buckle holding arc, and the lower male buckle is provided with a lower male buckle holding arc. The upper male buckle and the lower male buckle are provided with meshing teeth on their opposite end faces. And / or, both the upper male buckle holding rod arc and the lower male buckle holding rod arc are provided with at least two positioning teeth; And / or, the mating end faces of the upper female buckle and the male buckle, as well as the mating end faces of the lower female buckle and the male buckle, are both L-shaped; And / or, the axis of the upper holding rod groove intersects the axis of the lower holding rod groove.

11. The severe spinal deformity correction instrument of claim 9, wherein, The locking component includes a locking bolt that passes sequentially through the upper female thread, the male thread, and the lower female thread and is threadedly connected to the lower female thread, wherein: The lower end of the locking bolt is provided with a bolt base nail, and the lower end of the lower nut is provided with a bolt base nail clearance hole; And / or, the shank of the locking bolt is fitted with a drive ring above the upper female buckle, the upper end of the upper female buckle is provided with a drive ring groove, and the lower surface of the drive ring and the inner surface of the drive ring groove are mutually mating spherical or inclined surfaces.

12. The severe spinal deformity correction instrument of claim 2 or 8, wherein, The severe spinal deformity correction device also includes an unlocker for unlocking the lifting screw holder or the fixed screw holder, the unlocker being able to drive the first sliding sleeve or the second sliding sleeve to rotate, thereby separating the first elastic arm or the second elastic arm from the pedicle screw.

13. The severe spinal deformity correction instrument of claim 12, wherein, The unlocking device includes a drive cap, a connecting arm, and a sliding stop arm connected sequentially from top to bottom. The drive cap has a through hole for the threaded tube or the smooth tube to pass through. The sliding stop arm has a lifting groove for cooperating with the first limiting stop or the second limiting stop, wherein: The lower end of the sliding stop arm is provided with a stop entrance that communicates with the middle of the lifting groove, thereby forming a lifting arm on each of the left and right sides below the lifting groove. And / or, the connecting arm, from top to bottom, includes a straight arm segment and an inwardly inclined oblique arm segment.

14. A severe spinal deformity correction system comprising: Includes pedicle screws and the spinal deformity correction device according to any one of claims 1-13, wherein the pedicle screw is a unidirectional screw or a universal screw.

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