Spine fixing device

Abstract

The utility model belongs to the technical field of medical auxiliary instruments, and discloses a spine fixing device. The spine fixing device is used for fixing two adjacent spinous processes and comprises a support, an elastic piece and a locking assembly, and the support comprises a first support and a second support which are movably connected; the limiting part on the second bracket can be movably clamped in the mounting cavity of the first bracket; the elastic piece is arranged between the first bracket and the second bracket; the locking assembly is used for fixing the spinous process to the first support or the second support. By arranging the mounting cavity and the limiting part, the limiting part is movably clamped in the mounting cavity, movable connection of the first support and the second support is achieved, the spine can be supported, and the micro-motion requirement of the spine can also be met; when the spine slightly moves, the limiting part of the corresponding second support slightly moves in the mounting cavity of the first support, and no burden is caused to other parts of the spine.

Description

Technical Field

[0001] The utility model relates to the technical field of medical auxiliary equipment, in particular to a spinal fixation device. Background Art

[0002] The spine is an important supporting structure of the human body, consisting of multiple vertebrae connected by lumbar discs and ligaments. Due to trauma or disease, the spine may be deformed or damaged, leading to pain or movement dysfunction.

[0003] In the prior art, spinal surgery is usually used for treatment. For the initially unstable spine, a rigid fixation device is placed between the adjacent spinous processes of the spine to provide stable support and help the spine heal and recover. However, the rigid fixation device cannot meet the activity requirements of the spine, cannot achieve micro-motion of the spine, and may also cause changes in the biomechanical properties of the spine, increasing the burden on other parts.

[0004] That is, the existing rigid fixation devices have the disadvantages of not being able to meet the micro-motion requirements of the spine, and may also cause changes in the biomechanical properties of the spine, increasing the burden on other parts. Utility Model Content

[0005] The utility model aims to provide a spinal fixation device to solve the problem that the existing rigid fixation device cannot meet the micro-motion requirements of the spine and may also cause changes in the biomechanical properties of the spine and increase the burden on other parts.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a spinal fixation device, which comprises:

[0008] A bracket, comprising a first bracket and a second bracket movably connected, wherein the first bracket and the second bracket are respectively used to fix two adjacent spinous processes;

[0009] The first bracket is provided with an installation cavity, the installation cavity forms an opening on the first bracket, and the second bracket is provided with a limiting portion, the limiting portion can enter the installation cavity through the opening and be movably locked in the installation cavity;

[0010] An elastic member, disposed between the first bracket and the second bracket;

[0011] A locking assembly is used to fix the spinous process to the first bracket or the second bracket.

[0012] As an optional technical solution of a spinal fixation device, the second bracket includes:

[0013] A base, used for fixing the spinous process;

[0014] A connecting rod has one end connected to the base and the other end connected to the limiting portion, and the elastic member is sleeved on the outside of the connecting rod.

[0015] As an optional technical solution of a spinal fixation device, the limiting portion radially protrudes from the connecting rod, and the shape of the limiting portion matches the shape of the opening.

[0016] As an optional technical solution for a spinal fixation device, the cross section of the installation cavity is circular, the cross section of the limiting portion is elliptical, and the inner diameter of the installation cavity is greater than the length of the long axis of the limiting portion.

[0017] As an optional technical solution of a spinal fixation device, the opening is elliptical, the connecting rod is a round rod, and the outer diameter of the connecting rod is smaller than the length of the short axis of the opening.

[0018] As an optional technical solution of a spinal fixation device, the depth of the mounting cavity is greater than or equal to the thickness of the limiting portion.

[0019] As an optional technical solution of a spinal fixation device, the first bracket and the second bracket are both provided with limiting grooves on the sides opposite to each other, and the limiting grooves are used to accommodate the spinous processes.

[0020] As an optional technical solution of a spinal fixation device, the limiting groove on the first bracket and the limiting groove on the second bracket extend in the same direction.

[0021] As an optional technical solution of a spinal fixation device, the locking assembly includes a locking screw and a locking nut. The locking screw passes through the spinous process and the first bracket or the second bracket and is threadedly connected to the locking nut.

[0022] As an optional technical solution of a spinal fixation device, the elastic member is made of polycarbonate polyurethane material.

[0023] Beneficial effects:

[0024] The utility model provides a spinal fixation device, which includes a bracket, an elastic member and a locking assembly. The bracket includes a first bracket and a second bracket that are movably connected, and the first bracket and the second bracket are respectively used to fix two adjacent spinous processes; the first bracket is provided with a mounting cavity, and the mounting cavity is formed with an opening on the first bracket; the second bracket is provided with a limiting portion, and the limiting portion can enter the mounting cavity through the opening and be movably clamped in the mounting cavity; the elastic member is arranged between the first bracket and the second bracket; the locking assembly is used to fix the spinous process on the first bracket or the second bracket. By setting the mounting cavity and the limiting portion, the limiting portion is movably clamped in the mounting cavity, and the movable connection between the first bracket and the second bracket is realized, which can provide support for the spine and meet the micro-movement requirements of the spine; when the spine is slightly moved, the corresponding limiting portion of the second bracket will be slightly moved in the mounting cavity of the first bracket, and the elastic member will be correspondingly compressed or elongated for subsequent resetting, which will neither change the biomechanical properties of the spine nor cause burden on other parts of the spine. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a spinal fixation device provided by an embodiment of the utility model;

[0026] Figure 2 This is a cross-sectional view of a spinal fixation device provided by an embodiment of the utility model. Figure 1 ;

[0027] Figure 3 This is a cross-sectional view of a spinal fixation device provided by an embodiment of the utility model. Figure 2 ;

[0028] Figure 4 It is a structural schematic diagram of a locking assembly provided by an embodiment of the utility model;

[0029] Figure 5 It is a schematic diagram of the structure of the elastic member provided in the embodiment of the utility model;

[0030] Figure 6 This is a cross-sectional view of the first bracket provided in the embodiment of the utility model Figure 1 ;

[0031] Figure 7 is a side view of a first bracket provided by an embodiment of the utility model;

[0032] Figure 8 It is a bottom view of the first bracket provided by the embodiment of the utility model;

[0033] Fig. 9 is a top view of a first bracket provided in an embodiment of the utility model;

[0034] Fig.10 This is a cross-sectional view of the first bracket provided in the embodiment of the utility model Figure 2 ;

[0035] Fig.11 It is a front view of the second bracket provided by the embodiment of the utility model;

[0036] Fig.12 is a side view of a second bracket provided in an embodiment of the utility model;

[0037] Fig.13 is a bottom view of the second bracket provided by the embodiment of the utility model;

[0038] Fig.14 It is a top view of the second bracket provided in the embodiment of the utility model.

[0039] In the figure:

[0040] 10. first bracket; 11. mounting cavity; 12. opening; 13. first limiting groove;

[0041] 20. second bracket; 21. base; 211. second limiting groove; 22. connecting rod; 23. limiting part;

[0042] 30. Elastic parts;

[0043] 40. Locking assembly; 41. Locking screw; 42. Locking nut. DETAILED DESCRIPTION

[0044] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0045] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0047] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0048] like Figures 1 to 5 As shown, this embodiment provides a spinal fixation device, which includes a bracket, an elastic member 30 and a locking assembly 40. The bracket includes a first bracket 10 and a second bracket 20 that are movably connected. The first bracket 10 and the second bracket 20 are respectively used to fix two adjacent spinous processes; the first bracket 10 is provided with a mounting cavity 11, and the mounting cavity 11 is formed with an opening 12 on the first bracket 10; the second bracket 20 is provided with a limiting portion 23, and the limiting portion 23 can enter the mounting cavity 11 through the opening 12 and be movably clamped in the mounting cavity 11; the elastic member 30 is arranged between the first bracket 10 and the second bracket 20; the locking assembly 40 is used to fix the spinous process on the first bracket 10 or the second bracket 20.

[0049] The limiting portion 23 is movably arranged in the mounting cavity 11, specifically, the limiting portion 23 is arranged to cooperate with the mounting cavity 11 to realize the movable connection between the first bracket 10 and the second bracket 20, that is, the first bracket 10 and the second bracket 20 can rotate relative to each other or can move relative to each other in at least one direction; the limiting portion 23 is arranged in the mounting cavity 11, which means that the limiting portion 23 can remain connected with the mounting cavity 11 after being placed into the mounting cavity 11 from the opening 12, so as to ensure that the first bracket 10 and the second bracket 20 will not be separated during the use of the spinal fixation device.

[0050] By providing the mounting cavity 11 and the limiting portion 23, the limiting portion 23 is movably clamped in the mounting cavity 11, thereby realizing an active connection between the first bracket 10 and the second bracket 20, which can not only provide support for the spine, but also meet the needs of micro-movement of the spine in different directions; when the spine moves slightly (for example, moves axially, or moves laterally or rotates), the corresponding limiting portion 23 of the second bracket 20 moves slightly in the mounting cavity 11 of the first bracket 10, and the elastic member 30 is correspondingly compressed or elongated for subsequent resetting, which will neither change the biomechanical properties of the spine nor cause a burden on other parts of the spine.

[0051] Specifically, the first bracket 10 and the second bracket 20 are both provided with a limiting groove on the opposite side, and the limiting groove is used to accommodate the spinous process. By providing the limiting groove on both the first bracket 10 and the second bracket 20, the limiting groove can limit the spinous process, thereby fixing two adjacent spinous processes.

[0052] In this embodiment, the first bracket 10 is provided with a first limiting groove 13, and the second bracket 20 is provided with a second limiting groove 211; the first limiting groove 13 and the second limiting groove 211 are both U-shaped grooves. When the first bracket 10 and the second bracket 20 are connected and cooperate to fix the spinous process, the first limiting groove 13 and the second limiting groove 211 extend in the same direction.

[0053] Furthermore, in order to make the elastic member 30 cooperate with the limiting portion 23 of the second bracket 20 to perform micro-movement, the second bracket 20 further includes a base 21 and a connecting rod 22, the base 21 is used to fix the spinous process, one end of the connecting rod 22 is connected to the base 21, the other end of the connecting rod 22 is connected to the limiting portion 23, and the elastic member 30 is sleeved on the outside of the connecting rod 22. By arranging the connecting rod 22 on the second bracket 20 and sleeved on the outside of the connecting rod 22, the elastic member 30 can be stretched, compressed, rotated or translated accordingly as the limiting portion 23 micro-moves, so as to ensure that it can be smoothly reset after micro-movement.

[0054] In this embodiment, the second limiting groove 211 is disposed on a side of the base 21 away from the connecting rod 22; see Figure 2 and Figure 5 The elastic member 30 is an elastic ring; the elastic member 30 is made of polycarbonate polyurethane material. Polycarbonate polyurethane material is a polymer material with high strength, high toughness and high strength.

[0055] In order to ensure that the connecting rod 22 does not affect the micro-movement of the limiting portion 23, the limiting portion 23 radially protrudes from the connecting rod 22, and the shape of the limiting portion 23 matches the shape of the opening 12. When the limiting portion 23 enters the installation cavity 11 from the opening 12, since the size of the connecting rod 22 is smaller than the size of the opening 12, the connecting rod 22 will not contact and collide with the edge of the opening 12 when the limiting portion 23 micro-moves. In other embodiments, the shape of the opening 12 can also be different from the shape of the limiting portion 23, as long as it can ensure that the limiting portion 23 can enter the installation cavity 11 from the opening 12.

[0056] See also Figures 6 to 14 In this embodiment, the cross section of the installation cavity 11 is circular, the cross section of the limiting portion 23 is elliptical, and the inner diameter of the installation cavity 11 is greater than the length of the long axis of the limiting portion 23; the opening 12 is elliptical, the connecting rod 22 is a circular rod, and the outer diameter of the connecting rod 22 is less than the length of the short axis of the opening 12; the depth of the installation cavity 11 is greater than the thickness of the limiting portion 23. By setting the installation cavity 11 as a circular cavity and setting the limiting portion 23 as an elliptical shape, it is helpful for the outer surface of the limiting portion 23 and the inner wall of the installation cavity 11 to move smoothly relative to each other; by setting the outer diameter of the connecting rod 22 to be less than the length of the short axis of the opening 12, the connecting rod 22 can move freely relative to the opening 12; by setting the inner diameter of the installation cavity 11 to be greater than the length of the long axis of the limiting portion 23, the limiting portion 23 can rotate freely or move radially, and by setting the depth of the installation cavity 11 to be greater than the thickness of the limiting portion 23, the limiting portion 23 can move up and down, thereby meeting the activity requirements in different directions and realizing universal micro-motion.

[0057] It is understandable that in other embodiments, the inner diameter of the installation cavity 11 may be set to be larger than the length of the long axis of the limiting portion 23, and the depth of the installation cavity 11 may be set to be equal to the thickness of the limiting portion 23. In this case, the limiting portion 23 can only rotate freely or move radially, and the limiting portion 23 cannot move up and down. Similarly, the movement of the limiting portion 23 along a preset direction may be limited by setting the installation cavity 11 of other shapes to meet the activity requirements in a specific direction.

[0058] In this embodiment, in order to ensure that the limiting portion 23 can be stopped in the installation cavity 11 when the spinal fixation device is in use, the limiting portion 23 and the opening 12 are both elliptical. When the limiting portion 23 is inserted into the opening 12, the limiting portion 23 matches the shape of the opening 12. At this time, the straight line direction of the long axis of the limiting portion 23 is parallel to the straight line direction of the long axis of the opening 12; then the first bracket 10 and the second bracket 20 are rotated 90 degrees relative to each other, so that the straight line direction of the long axis of the limiting portion 23 is perpendicular to the straight line direction of the long axis of the opening 12. At this time, the first limiting groove 13 and the second limiting groove 211 both extend in the same direction, and the limiting portion 23 is stopped at the edge of the opening 12 and is thus clamped in the installation cavity 11. The first bracket 10 and the second bracket 20 are fixed on the corresponding spinous processes, thereby effectively preventing the limiting portion 23 from escaping from the installation cavity 11.

[0059] See also Figure 4 The locking assembly 40 includes a locking screw 41 and a locking nut 42. The locking screw 41 is inserted into the spinous process and the first bracket 10 or the second bracket 20 and is screwed to the locking nut 42. The locking assembly 40 is provided to lock the bracket on the spine, thereby providing support for the spine; the locking screw 41 and the locking nut 42 are used for locking and fixing, which has a simple structure and high reliability.

[0060] See also Figure 7 and Fig.14 In this embodiment, a first mounting hole is provided on the first bracket 10, and a second mounting hole is provided on the base 21 of the second bracket 20. The first mounting hole and the second mounting hole are both used for the locking screw 41 to pass through so as to fix the first bracket 10 and the second bracket 20 to two adjacent spinous processes. The axial direction of the first mounting hole is perpendicular to the extension direction of the first limiting groove 13; the axial direction of the second mounting hole is perpendicular to the extension direction of the second limiting groove 211.

[0061] In spinal fixation, the spinal fixation device needs to be fixed between the spinous processes of adjacent vertebrae to provide stable support and promote the healing of the spine. The following is the specific use process of the spinal fixation device:

[0062] First, according to the distance between the first mounting hole and the second mounting hole, holes are punched at corresponding positions of the spinous processes of adjacent vertebrae so as to be fixed by the locking assembly 40. After the drilling is completed, the first bracket 10 and the second bracket 20 are placed at corresponding positions.

[0063] See also Figures 1 to 3, the elastic member 30 is sleeved on the connecting rod 22 of the second bracket 20, the limiting portion 23 of the second bracket 20 is placed in the installation cavity 11 from the opening 12, and the first bracket 10 and the second bracket 20 are rotated 90 degrees relative to each other, so that the installation grooves of the first bracket 10 and the second bracket 20 extend in the same direction. At this time, the limiting portion 23 is blocked by the edge of the opening 12, and the limiting portion 23 will not fall out of the installation cavity 11.

[0064] Two sets of locking assemblies 40 are used to fix the spinous process on the first bracket 10 or the second bracket 20 respectively; the two sets of locking assemblies 40 are respectively the first locking assembly and the second locking assembly, and the locking screw 41 of the first locking assembly is passed through the first mounting hole of the first bracket 10 and the corresponding spinous process punching position, and is locked by the locking nut 42 of the first locking assembly; the locking screw 41 of the second locking assembly is passed through the second mounting hole of the second bracket 20 and the existing spinous process punching position, and is locked by the locking nut 42 of the second locking assembly. After the spinal fixation device is fixed to the spinous process by the locking assembly 40, the relative range of motion of the first bracket 10 and the second bracket 20 is limited, and the limiting portion 23 will not fall out of the mounting cavity 11 during micro-motion or recovery.

[0065] After the spinal fixation device is installed on the spine, the limiting portion 23 of the second bracket 20 can rotate in the installation cavity 11, and can also move radially, or move up and down; it can better meet the needs of micro-movement in different directions, provide more comprehensive and stable support, and avoid spinal injuries caused by a single fixation direction; in actual application, the spinal fixation device can be personalized designed and adjusted according to the patient's specific situation to improve the treatment accuracy and treatment effect of spinal fixation, and greatly reduce secondary injuries caused by improper treatment.

[0066] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A spinal fixation device, characterized in that: include: A support, comprising a first support (10) and a second support (20) which are movably connected, wherein the first support (10) and the second support (20) are respectively used to fix two adjacent spinous processes; The first bracket (10) is provided with a mounting cavity (11), the mounting cavity (11) forms an opening (12) on the first bracket (10), and the second bracket (20) is provided with a limiting portion (23), the limiting portion (23) can enter the mounting cavity (11) through the opening (12) and be movably locked in the mounting cavity (11); An elastic member (30) is disposed between the first bracket (10) and the second bracket (20); A locking assembly (40) is used to fix the spinous process to the first bracket (10) or the second bracket (20).

2. The spinal fixation device according to claim 1, characterized in that: The second bracket (20) comprises: A base (21) for fixing the spinous process; A connecting rod (22) has one end connected to the base (21) and the other end connected to the limiting portion (23); and the elastic member (30) is sleeved outside the connecting rod (22).

3. The spinal fixation device according to claim 2, characterized in that: The limiting portion (23) radially protrudes from the connecting rod (22), and the shape of the limiting portion (23) matches the shape of the opening (12).

4. The spinal fixation device according to claim 3, characterized in that: The cross section of the installation cavity (11) is circular, the cross section of the limiting portion (23) is elliptical, and the inner diameter of the installation cavity (11) is greater than the length of the major axis of the limiting portion (23).

5. The spinal fixation device according to claim 3, characterized in that: The opening (12) is elliptical, the connecting rod (22) is a circular rod, and the outer diameter of the connecting rod (22) is smaller than the length of the short axis of the opening (12).

6. The spinal fixation device according to claim 1, characterized in that: The depth of the installation cavity (11) is greater than or equal to the thickness of the limiting portion (23).

7. The spinal fixation device according to claim 1, characterized in that: The first bracket (10) and the second bracket (20) are both provided with limiting grooves on the opposite sides thereof, and the limiting grooves are used to accommodate the spinous processes.

8. The spinal fixation device according to claim 7, characterized in that: The limiting groove on the first bracket (10) and the limiting groove on the second bracket (20) extend in the same direction.

9. The spinal fixation device according to any one of claims 1 to 8, characterized in that: The locking assembly (40) comprises a locking screw (41) and a locking nut (42); the locking screw (41) is inserted through the spinous process and the first bracket (10) or the second bracket (20) and is threadedly connected to the locking nut (42).

10. The spinal fixation device according to any one of claims 1 to 8, characterized in that: The elastic member (30) is made of polycarbonate polyurethane material.

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