Spine correction fixing device for surgery department

Abstract

The invention belongs to the technical field of spine joint fixation, and particularly relates to a surgical spine correcting and fixing device which comprises an outer joint assembly, a rotary joint assembly, a lead screw adjusting assembly and a double-shaft limiting elastic assembly, and the outer joint assembly and the rotary joint assembly are rotationally connected through the lead screw adjusting assembly; the double-shaft limiting elastic assembly is arranged between the outer joint assembly and the rotary joint assembly. The distance between the two sliding baffles can be adjusted by rotating the hand wheel, so that the compression amplitude of the spiral elastic piece is adjusted, and then the micro-motion resistance and the micro-motion amplitude of the sliding base relative to the outer joint base are adjusted so as to meet the requirements of different recovery stages; when the axial length of the spiral elastic piece is large, the elastic force of axial compression and radial torsion is small, and at the moment, the resistance of joint micromotion is small; when the axial length of the spiral elastic piece is small, the elastic force of axial compression and radial torsion is large, and at the moment, the resistance of joint micromotion is large.

Description

Technical Field

[0001] This invention belongs to the field of spinal joint fixation technology, specifically referring to a surgical spinal correction and fixation device. Background Technology

[0002] Traditional surgical spinal fixation devices (such as pedicle screws and rod systems) typically employ rigid fixation. While providing stable support, long-term use can lead to stress shielding, adjacent segmental dysplasia (ASD), limited patient mobility, and discomfort. Furthermore, existing devices are difficult to adjust after implantation, often requiring a second surgery, increasing patient suffering and medical costs. The core problem of this invention is: how to design a mechanical mechanism that provides adjustable dynamic support, mimicking the natural physiological micro-movements of the spine, while allowing for non-invasive postoperative adjustments, thereby reducing complications and improving patient comfort. Summary of the Invention

[0003] To address the above issues and overcome the shortcomings of existing technologies, this invention provides a surgical spinal correction and fixation device. By rotating a handwheel, the distance between two sliding baffles can be adjusted, thereby regulating the compression amplitude of the helical elastic element. This, in turn, adjusts the micro-motion resistance and amplitude of the sliding base relative to the external joint seat, adapting to the needs of different recovery stages. When the axial length of the helical elastic element is long, both the axial compression and radial torsion forces are small, resulting in low resistance to joint micro-motion. Conversely, when the axial length of the helical elastic element is short, both the axial compression and radial torsion forces are large, leading to greater resistance to joint micro-motion.

[0004] The technical solution adopted by this invention is as follows: This invention proposes a surgical spinal correction and fixation device, including an external joint assembly, a rotational joint assembly, a lead screw adjustment assembly, and a biaxial limiting elastic assembly. The external joint assembly and the rotational joint assembly are rotatably connected by the lead screw adjustment assembly. The biaxial limiting elastic assembly is disposed between the external joint assembly and the rotational joint assembly. The component array composed of the external joint assembly, the rotational joint assembly, the lead screw adjustment assembly, and the biaxial limiting elastic assembly is arranged in several groups. The number of components is selected according to the number of spinal joints injured by the patient.

[0005] Furthermore, the external joint assembly includes an external joint seat, on which a fork holder hole is provided; the lead screw adjustment assembly includes a bidirectional lead screw and a lead screw support bearing, the outer ring of the lead screw support bearing is engaged in the fork holder hole, the inner ring of the lead screw support bearing is fixed to both ends of the bidirectional lead screw, and a handwheel is provided at the middle position of the bidirectional lead screw.

[0006] Furthermore, the rotary joint assembly includes a sliding base and a sliding baffle. The sliding base is provided with a sliding groove, and the sliding baffle is provided with a guide rail, which is slidably disposed in the sliding groove.

[0007] By rotating the handwheel, the distance between the two sliding baffles can be adjusted, thereby adjusting the compression amplitude of the helical elastic element, and further adjusting the micro-motion resistance and micro-motion amplitude of the sliding base relative to the outer joint seat to adapt to the needs of different recovery stages.

[0008] Furthermore, the biaxial limiting elastic component includes a differential chuck and a helical elastic element. The differential chuck is provided with an array of holes for fixing the helical elastic element, and the gaps between the holes are provided with ridges for increasing friction. The helical elastic element is located between the differential chuck and the outer joint seat.

[0009] When the axial length of the helical elastic element is relatively long, the elastic forces of axial compression and radial torsion are both small, and the resistance to joint micro-movement is small. When the axial length of the helical elastic element is relatively short, the elastic forces of axial compression and radial torsion are both large, and the resistance to joint micro-movement is large.

[0010] Preferably, one end of the helical elastic element is fixed to the differential chuck, and the other end of the helical elastic element is fixed to the outer joint seat.

[0011] Furthermore, the guide ring has a thread inside that matches the bidirectional lead screw, and a micro-motion diaphragm is provided on the guide ring. The micro-motion diaphragm is fixed to the side of the sliding base. When the bidirectional lead screw rotates, the two sliding bases will slide in opposite directions.

[0012] When the guide ring moves closer or further away, it can push the sliding baffles closer or further apart, thereby actively adjusting the pre-compression of the helical elastic element.

[0013] Preferably, the sliding baffle is provided with a central circular hole, the diameter of which is larger than the diameter of the bidirectional lead screw.

[0014] Preferably, the differential chuck is rotatably disposed on the outside of the sliding baffle, and the differential chuck can rotate and lock relative to the sliding baffle.

[0015] When the recovery status of the two sides of the spine is different and the required support force is also different, the pre-compression of the helical elastic elements on both sides can be adjusted independently by rotating the differential chuck.

[0016] The beneficial effects achieved by the present invention using the above structure are as follows: (1) By rotating the handwheel, the distance between the two sliding baffles can be adjusted, thereby adjusting the compression amplitude of the helical elastic element, and then adjusting the micro-motion resistance and micro-motion amplitude of the sliding base relative to the outer joint seat to meet the needs of different recovery stages.

[0017] (2) When the axial length of the helical elastic element is relatively long, the elastic forces of axial compression and radial torsion are relatively small, and the resistance of joint micro-movement is relatively small; when the axial length of the helical elastic element is relatively short, the elastic forces of axial compression and radial torsion are relatively large, and the resistance of joint micro-movement is relatively large.

[0018] (3) When the guide ring moves closer or further away, it can push the sliding baffles closer or further away from each other, thereby actively adjusting the pre-compression of the spiral elastic element.

[0019] (4) When the recovery status of the two sides of the spine is different and the required support force is also different, the pre-compression of the spiral elastic elements on both sides can be adjusted independently by rotating the differential chuck. Attached Figure Description

[0020] Figure 1 This is a perspective view of a surgical spinal correction and fixation device proposed in this invention; Figure 2 This is a front view of a surgical spinal correction and fixation device proposed in this invention; Figure 3 This is a left view of a surgical spinal correction and fixation device proposed in this invention; Figure 4 for Figure 2 A cross-sectional view along the cutting line AA; Figure 5 for Figure 3 A cross-sectional view along the cutting line BB; Figure 6 This is an exploded structural diagram of a surgical spinal correction and fixation device proposed in this invention; Figure 7 for Figure 4 A magnified view of a section at point I; Figure 8 for Figure 6 A magnified view of section II in the middle.

[0021] Among them, 1. External joint assembly, 2. Rotary joint assembly, 3. Screw adjustment assembly, 4. Dual-axis limiting elastic assembly, 11. Alloy nail, 12. External joint seat, 21. Sliding base, 22. Sliding baffle, 23. Guide ring, 31. Bidirectional screw, 32. Screw support bearing, 41. Differential chuck, 42. Helical elastic element, 121. Fork hole, 211. Sliding groove, 221. Guide rail, 222. Central circular hole, 231. Micro-motion diaphragm, 311. Handwheel, 411. Rib, 412. Hole.

[0022] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] like Figures 1-8 As shown, the present invention proposes a surgical spinal correction and fixation device, including an external joint assembly 1, a rotational joint assembly 2, a lead screw adjustment assembly 3, and a biaxial limiting elastic assembly 4. The external joint assembly 1 and the rotational joint assembly 2 are rotatably connected by the lead screw adjustment assembly 3. The biaxial limiting elastic assembly 4 is disposed between the external joint assembly 1 and the rotational joint assembly 2. The component array composed of the external joint assembly 1, the rotational joint assembly 2, the lead screw adjustment assembly 3, and the biaxial limiting elastic assembly 4 is arranged in several groups, and the number of components is selected according to the number of spinal joints injured by the patient.

[0026] The external joint assembly 1 includes an external joint seat 12, on which a fork hole 121 is provided. The lead screw adjustment assembly 3 includes a bidirectional lead screw 31 and a lead screw support bearing 32. The outer ring of the lead screw support bearing 32 is engaged in the fork hole 121, and the inner ring of the lead screw support bearing 32 is fixed to both ends of the bidirectional lead screw 31. A handwheel 311 is provided at the middle position of the bidirectional lead screw 31.

[0027] The rotary joint assembly 2 includes a sliding base 21 and a sliding baffle 22. The sliding base 21 is provided with a sliding groove 211, and the sliding baffle 22 is provided with a guide rail 221. The guide rail 221 is slidably disposed in the sliding groove 211.

[0028] By rotating the handwheel 311, the distance between the two sliding baffles 22 can be adjusted, thereby adjusting the compression amplitude of the helical elastic element 42, and further adjusting the micro-motion resistance and micro-motion amplitude of the sliding base 21 relative to the outer joint seat 12 to adapt to the needs of different recovery stages.

[0029] The biaxial limiting elastic assembly 4 includes a differential chuck 41 and a helical elastic element 42. The differential chuck 41 is provided with an array of holes 412 for fixing the helical elastic element 42. The gaps between the holes 412 are provided with ridges 411 for increasing friction. The helical elastic element 42 is located between the differential chuck 41 and the outer joint seat 12.

[0030] When the axial length of the helical elastic element 42 is relatively long, the elastic forces of axial compression and radial torsion are both small, and the resistance to joint micro-movement is small. When the axial length of the helical elastic element 42 is relatively short, the elastic forces of axial compression and radial torsion are both large, and the resistance to joint micro-movement is large.

[0031] One end of the helical elastic element 42 is fixed to the differential chuck 41, and the other end of the helical elastic element 42 is fixed to the outer joint seat 12.

[0032] The guide ring 23 has a thread inside that matches the bidirectional lead screw 31. The guide ring 23 has a micro-motion diaphragm 231, which is fixed to the side of the sliding base 21. When the bidirectional lead screw 31 rotates, the two sliding bases 21 will slide in opposite directions.

[0033] When the guide ring 23 moves closer or further away, it can push the sliding baffles 22 closer or further away from each other, thereby actively adjusting the pre-compression of the helical elastic element 42.

[0034] The sliding baffle 22 is provided with a central circular hole 222, the diameter of which is larger than the diameter of the bidirectional lead screw 31.

[0035] The differential chuck 41 is rotatably disposed on the outside of the sliding baffle 22, and the differential chuck 41 can rotate and lock relative to the sliding baffle 22.

[0036] When the recovery status of the two sides of the spine is different and the required support force is also different, the pre-compression of the helical elastic elements 42 on both sides can be independently adjusted by rotating the differential chuck 41.

[0037] In practical use, the doctor first needs to connect the patient's spinal joints with alloy nails 11, and then the pressure that the spine would have to bear is distributed through the compensation of this device. In addition, this device can also provide a certain degree of traction and correction to the spine to assist the patient's recovery. The component array consisting of external joint assembly 1, rotational joint assembly 2, screw adjustment assembly 3 and biaxial limiting elastic assembly 4 is arranged in several groups, and the number of these components is selected according to the number of spinal joints injured by the patient.

[0038] After installation, the support force of each joint needs to be manually fine-tuned. Generally, the weaker the spine itself, the greater the support force of this device needs to be. The device compensates for the overall stability of the spine. As the patient recovers, the patient's own strength will gradually increase. During this process, the support force of this device can be gradually reduced and the range of motion of this device can be expanded to adapt to the patient's recovery process.

[0039] When it is necessary to increase the support force of this device, simply rotate the bidirectional lead screw 31 manually. The two guide rings 23 will move away from each other with the sliding baffles 22 respectively. At this time, the compression of the spiral elastic element 42 increases and the elastic force increases. When the compression of the helical elastic element 42 increases, the resistance to rotation and torsion of the sliding base 21 relative to the outer joint seat 12 will increase, thus improving the stability and support of the device.

[0040] When it is necessary to reduce the support force of this device, simply rotate the bidirectional lead screw 31 in the opposite direction, which will increase the range of motion of this device.

[0041] When the muscles on both sides of the patient recover asynchronously, the differential chuck 41 can be rotated relative to the sliding baffle 22 and then locked. This step can, to a certain extent, change the gap by increasing the diameter of the helical elastic element 42, thereby achieving differential adjustment of the support force on both sides.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A surgical spinal correction and fixation device, characterized in that: The device includes an external joint assembly (1), a rotational joint assembly (2), a screw adjustment assembly (3), and a biaxial limiting elastic assembly (4). The external joint assembly (1) and the rotational joint assembly (2) are rotatably connected by the screw adjustment assembly (3). The biaxial limiting elastic assembly (4) is located between the external joint assembly (1) and the rotational joint assembly (2). The component array consisting of the external joint assembly (1), the rotational joint assembly (2), the screw adjustment assembly (3), and the biaxial limiting elastic assembly (4) is arranged in several groups. The number of components is selected according to the number of spinal joints injured by the patient.

2. The surgical spinal correction and fixation device according to claim 1, characterized in that: The external joint assembly (1) includes an external joint seat (12), and the external joint seat (12) is provided with a fork hole (121). The screw adjustment assembly (3) includes a two-way screw (31) and a screw support bearing (32). The outer ring of the screw support bearing (32) is engaged in the fork hole (121), and the inner ring of the screw support bearing (32) is fixed to both ends of the two-way screw (31). A handwheel (311) is provided in the middle position of the two-way screw (31).

3. A surgical spinal correction and fixation device according to claim 2, characterized in that: The rotary joint assembly (2) includes a sliding base (21) and a sliding baffle (22). The sliding base (21) is provided with a sliding groove (211), and the sliding baffle (22) is provided with a guide rail (221). The guide rail (221) is slidably disposed in the sliding groove (211).

4. A surgical spinal correction and fixation device according to claim 3, characterized in that: The biaxial limiting elastic component (4) includes a differential chuck (41) and a helical elastic element (42). The differential chuck (41) is provided with an array of holes (412) for fixing the helical elastic element (42). The gaps in the holes (412) are provided with ridges (411) for increasing friction. The helical elastic element (42) is located between the differential chuck (41) and the outer joint seat (12).

5. A surgical spinal correction and fixation device according to claim 4, characterized in that: One end of the helical elastic element (42) is fixed to the differential chuck (41), and the other end of the helical elastic element (42) is fixed to the outer joint seat (12).

6. A surgical spinal correction and fixation device according to claim 5, characterized in that: The guide ring (23) has a thread inside that matches the bidirectional lead screw (31). The guide ring (23) has a micro-motion diaphragm (231) which is fixed to the side of the sliding base (21). When the bidirectional lead screw (31) rotates, the two sliding bases (21) will slide in opposite directions.

7. A surgical spinal correction and fixation device according to claim 6, characterized in that: The sliding baffle (22) is provided with a central circular hole (222), the diameter of which is larger than the diameter of the bidirectional lead screw (31).

8. A surgical spinal correction and fixation device according to claim 7, characterized in that: The differential chuck (41) is rotatably disposed on the outside of the sliding baffle (22), and the differential chuck (41) can rotate and lock relative to the sliding baffle (22).

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