Domino connector and spinal internal fixation system

Abstract

The utility model belongs to the technical field of medical instruments, and discloses a domino connector and a spinal internal fixation system. The domino joint comprises a first splicing piece, a second splicing piece and a connecting structure. A first mounting hole is formed in the first splicing piece in the first direction and used for mounting a connecting rod; first limiting parts are arranged on the two sides, in the second direction, of the first splicing piece; a second mounting hole is formed in the second splicing piece in the first direction and used for mounting a connecting rod; second limiting parts are arranged on the two sides, in the second direction, of the second splicing piece; the second splicing piece is configured to be selectively arranged on one side, in the first direction, of the first splicing piece or one side, in the second direction, of the first splicing piece; the two matching ends of the connecting structure are connected to the first limiting part and the second limiting part respectively, the connecting structure is used for connecting the first limiting part and the second limiting part in a limiting mode, the flexibility and adaptability of the domino connector are improved, domino connectors of various forms can be formed, the assembling difficulty is lowered, the number of parts is reduced, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a domino joint and a spinal internal fixation system. Background Art

[0002] The pedicle screw-rod system used in spinal internal fixation is used to stabilize the curvature of the spine in conditions such as herniated disc, scoliosis, and spinal cord injury. In some cases, after spinal internal fixation, the original connecting rod needs to be extended to increase the fixation range. This requires the use of a domino connector to increase the length of the connecting rod.

[0003] The domino joints used in conventional spinal fixation systems for pedicle screws and rods often utilize square or straight domino joints to securely connect the connecting rods. These joints require different sizes of connecting rods, resulting in a large number of components in the pedicle screw-rod system. Furthermore, adjacent connecting rods must be of the same size to be connected using the square domino joint, which limits the domino joint's scope of use and complicates its use.

[0004] Therefore, there is an urgent need for a domino joint and a spinal internal fixation system to solve the above technical problems. Utility Model Content

[0005] One purpose of the present invention is to provide a domino connector that can improve its flexibility and adaptability. By splicing the internal structure, the molding of domino connectors of various specifications and forms can be completed, thereby simplifying the difficulty of use, the number of parts and costs.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] Domino connectors, including:

[0008] A first splicing piece, wherein the first splicing piece is provided with a first mounting hole along a first direction for mounting a connecting rod; and first limiting portions are provided on both sides of the first splicing piece along a second direction, wherein the second direction is perpendicular to the first direction;

[0009] A second splicing piece, wherein the second splicing piece is provided with a second mounting hole along the first direction for mounting the connecting rod; and second limiting portions are provided on both sides of the second splicing piece along the second direction;

[0010] The second assembling piece is configured to be selectively arranged on one side of the first assembling piece along the first direction or on one side of the first assembling piece along the second direction;

[0011] A connecting structure, wherein the two mating ends of the connecting structure are respectively connected to the first limiting portion and the second limiting portion, and the connecting structure is used to connect the first limiting portion and the second limiting portion in a limiting manner.

[0012] Optionally, the above-mentioned connection structure also includes a first connecting member, and the above-mentioned first connecting member includes a first connecting portion and a second connecting portion arranged in sequence along the above-mentioned first direction. The above-mentioned first connecting portion is limitedly connected to the above-mentioned first limiting portion, and the above-mentioned second connecting portion is limitedly connected to the above-mentioned second limiting portion, so that the above-mentioned second splicing member is arranged on one side of the above-mentioned first splicing member along the above-mentioned first direction.

[0013] Optionally, the above-mentioned connecting structure includes a second connecting member, and the above-mentioned second connecting member includes a first protrusion and a second protrusion arranged opposite to each other along the above-mentioned second direction. The above-mentioned first protrusion is limitedly connected to the above-mentioned first limiting portion, and the above-mentioned second protrusion is limitedly connected to the above-mentioned second limiting portion, so that the above-mentioned second splicing member is arranged on one side of the above-mentioned first splicing member along the above-mentioned second direction.

[0014] Optionally, the first connecting portion is provided with a first fixing hole, and the first fixing hole is used for fixed connection with the first limiting portion;

[0015] The second connecting portion is provided with a second fixing hole, and the second fixing hole is used for fixed connection with the second limiting portion;

[0016] The first protrusion is provided with a third fixing hole, and the third fixing hole is used for fixed connection with the first limiting portion;

[0017] The second protruding portion is provided with a fourth fixing hole, and the fourth fixing hole is used for fixed connection with the second limiting portion.

[0018] Optionally, the first limiting portion includes a first limiting groove and a first fixing portion, and the connecting structure is slidably connected to the first limiting groove and can be fixedly connected to the first fixing portion;

[0019] The second limiting portion includes a second limiting groove and a second fixing portion. The connecting structure is slidably connected to the second limiting groove and can be fixedly connected to the second fixing portion.

[0020] Optionally, the domino connector further comprises a first fixing member, which can be passed through the first fixing portion and fixedly connected to the connecting structure;

[0021] The domino connector further includes a second fixing member, which can be passed through the second fixing portion and fixedly connected to the connecting structure.

[0022] Optionally, the first assembling piece and the connecting structure are movably connected, and / or the second assembling piece and the connecting structure are movably connected.

[0023] Optionally, the cross-sectional area of ​​the first limiting groove is larger than the cross-sectional area of ​​the corresponding mating end in the connection structure; and / or the cross-sectional area of ​​the second limiting groove is larger than the cross-sectional area of ​​the corresponding mating end in the connection structure.

[0024] Optionally, the first splicing piece is provided with a first fixing groove along the third direction, and the first fixing groove is threadedly connected to a first locking piece to lock the connecting rod in the first mounting hole; the first direction, the second direction and the third direction are perpendicular to each other;

[0025] The second assembling piece is provided with a second fixing groove along the third direction. The second fixing groove is threadedly connected with a second locking piece to lock the connecting rod in the second mounting hole.

[0026] Another object of the present invention is to provide a spinal internal fixation system, including the above-mentioned domino connector, which can improve its own flexibility and adaptability. By splicing the internal structure, domino connectors of various specifications can be formed, simplifying the difficulty of use, the number of parts and costs.

[0027] Beneficial effects of the utility model:

[0028] The utility model provides a domino joint and a spinal internal fixation system. A straight domino joint can be formed by connecting a first splicing piece and a second splicing piece along a first direction through a connecting structure; or a square domino joint can be formed by connecting the first splicing piece and the second splicing piece along a second direction through the connecting structure. The domino joint can switch between multiple modes, and the sizes of the first mounting hole and the second mounting hole can be the same or different. Such an arrangement can also enable fixed connection of two adjacent connecting rods of different specifications, simplifying the number of domino joints, improving the flexibility and adaptability of the domino joint, making it more applicable, more convenient to assemble, and reducing the cost of the spinal internal fixation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is an axonometric view of a domino joint spliced ​​into a straight shape provided by a specific embodiment of the utility model;

[0030] Figure 2 This is an axonometric view of a domino joint spliced ​​into a square provided by a specific embodiment of the utility model from one perspective;

[0031] Figure 3This is an axonometric view from another perspective of a domino joint spliced ​​into a square provided by a specific embodiment of the utility model;

[0032] Figure 4 It is an axonometric view of the first splicing piece provided in a specific embodiment of the present utility model;

[0033] Figure 5 It is an axonometric view of the first connecting member provided in a specific embodiment of the present utility model;

[0034] Figure 6 It is an axonometric view of the second connecting member provided in a specific embodiment of the present utility model.

[0035] In the picture:

[0036] 10. First splicing piece; 11. First mounting hole; 12. First limiting portion; 121. First limiting groove; 122. First fixing portion; 13. First fixing groove;

[0037] 20. Second splicing piece; 21. Second mounting hole;

[0038] 30. First connecting member; 31. First connecting portion; 311. First fixing hole; 32. Second connecting portion;

[0039] 40, second connecting member; 41, first protrusion; 411, third fixing hole; 42, second protrusion; 421, fourth fixing hole;

[0040] 50. First fixing member; 60. Second fixing member; 70. First locking member; 80. Second locking member. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0042] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0043] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0044] In the description of this embodiment, the terms "upper," "lower," "left," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0045] This embodiment provides a domino joint for assisting a connecting rod in performing spinal internal fixation.

[0046] It should be noted that the first direction is Figure 1 The Y direction in the second direction is Figure 1 The X direction in the third direction is Figure 1 In the Z direction, the X direction, Y direction and Z direction are perpendicular to each other.

[0047] Please refer to Figures 1 to 4 Specifically, the domino joint includes a first splicing piece 10, a second splicing piece 20, and a connecting structure. The first splicing piece 10 is provided with a first mounting hole 11 along a first direction for mounting a connecting rod; the first splicing piece 10 is provided with first limiting portions 12 on both sides along a second direction; the second splicing piece 20 is provided with second mounting holes 21 along the first direction for mounting a connecting rod; the second splicing piece 20 is provided with second limiting portions on both sides along the second direction; the second splicing piece 20 is configured to be selectively arranged on one side of the first splicing piece 10 along the first direction or on one side of the first splicing piece 10 along the second direction; the two mating ends of the connecting structure are respectively connected to the first limiting portion 12 and the second limiting portion (not shown in the figure), and the connecting structure is used to limit the connection between the first limiting portion 12 and the second limiting portion.

[0048] In the domino joint of this embodiment, a straight domino joint can be formed by connecting the first splicing piece 10 and the second splicing piece 20 along a first direction via a connecting structure; alternatively, a square domino joint can be formed by connecting the first splicing piece 10 and the second splicing piece 20 along a second direction via a connecting structure. This achieves switching of multiple modes of the domino joint, and the sizes of the first mounting hole 11 and the second mounting hole 21 can be the same or different. This arrangement also allows for fixed connection of two adjacent connecting rods of different specifications, simplifies the number of domino joints, improves the flexibility and adaptability of the domino joint, makes it more applicable, more convenient to assemble, and reduces the cost of the spinal fixation system.

[0049] It is understandable that the first assembly piece 10 and the second assembly piece 20 have the same structure and shape, and only the sizes of the internal structures may be the same or different. For example, the diameter of the first mounting hole 11 and the diameter of the second mounting hole 21 may be the same or different.

[0050] Please refer to Figures 1 to 4 In some embodiments, the first limiting portion 12 includes a first limiting groove 121 and a first fixing portion 122, and the connecting structure is slidably connected to the first limiting groove 121 and can be fixedly connected to the first fixing portion 122; that is, the first splicing piece 10 is assembled with the mating end corresponding to the connecting structure through the first limiting groove 121, and is fixed by the first fixing portion 122, so that the first splicing piece 10 and the connecting structure are firmly connected.

[0051] Similarly, the second limiting portion includes a second limiting groove and a second fixing portion (not shown in the figure), and the connecting structure is slidably connected to the second limiting groove and can be fixedly connected to the second fixing portion; that is, the second splicing piece 20 is assembled with the mating end corresponding to the connecting structure through the second limiting groove, and is fixed by the second fixing portion to ensure a firm connection between the second splicing piece 20 and the connecting structure.

[0052] Optionally, the cross-sectional shape of the first limiting groove 121 is trapezoidal, triangular or circular, etc., which can be matched with the connection structure.

[0053] In some embodiments, the domino connector further includes a first fixing member 50, which can be passed through the first fixing portion 122 and fixedly connected to the connecting structure; after the mating end corresponding to the connecting structure is assembled with the first limiting groove 121, the mating end corresponding to the connecting structure can be fixedly connected to the first fixing portion 122 through the first fixing portion 122, and the first splicing piece 10 and the connecting structure are firmly connected.

[0054] Similarly, the domino connector also includes a second fixing member 60, which can be inserted into the second fixing portion and fixedly connected to the connecting structure. After the corresponding mating end of the connecting structure is assembled with the second limiting groove, the corresponding mating end of the connecting structure can be fixedly connected to the second fixing portion via the second fixing portion, thereby firmly connecting the second splicing member 20 and the connecting structure.

[0055] Optionally, the first fixing portion 122 and the second fixing portion are both provided with connection holes, so that the first fixing member 50 and the second fixing member 60 are passed through the corresponding fixing portions to achieve fixed connection with the connection structure.

[0056] Optionally, the first fixing member 50 and the second fixing member 60 have the same size, and the corresponding two connecting holes also have the same size, so as to unify the installation specifications and reduce the number of parts.

[0057] In some embodiments, the first splicing piece 10 and the connecting structure are movably connected, and / or the second splicing piece 20 and the connecting structure are movably connected. This arrangement allows for the possibility of relative misalignment between the two connecting rods when the domino joint is assembled and fixed, particularly when the domino joint is square. The movably connected structure facilitates position adjustment and installation of the first splicing piece 10 and the second splicing piece 20 when they are not fixed. Fixation can be performed after assembly, thereby facilitating spinal fixation operations.

[0058] Optionally, the cross-sectional area of ​​the first limiting groove 121 is larger than the cross-sectional area of ​​the corresponding mating end in the connection structure; and / or the cross-sectional area of ​​the second limiting groove is larger than the cross-sectional area of ​​the corresponding mating end in the connection structure. This allows the mating end to move within the corresponding first limiting groove 121 and / or the corresponding second limiting groove to adjust the relative position.

[0059] Optionally, the aperture of the above-mentioned connecting hole may be larger than the size of the first fixing member 50, and the connecting hole may be larger than the size of the second fixing member 60, so as to assist the connection structure in position adjustment and ensure that it can still be fixed by the first fixing member 50 and / or the second fixing member 60 after position adjustment.

[0060] In some embodiments, the first splicing piece 10 is provided with a first fixing groove 13 along the third direction, and the first fixing groove 13 is threadedly connected to a first locking piece 70 to lock the connecting rod in the first mounting hole 11, that is, after the connecting rod is assembled, the first locking piece 70 is tightened in the first fixing groove 13, so that the first locking piece 70 is pressed against the connecting rod to lock the connecting rod.

[0061] Similarly, the second splicing piece 20 is provided with a second fixing groove (not shown in the figure) along the third direction, and the second fixing groove is threadedly connected to a second locking piece 80 to lock the connecting rod in the second mounting hole 21. That is, after the connecting rod is assembled, the second locking piece 80 is tightened in the second fixing groove so that the second locking piece 80 is pressed against the connecting rod to lock the connecting rod.

[0062] Optionally, two first fixing grooves 13 and two second fixing grooves are provided, and the provision of two fixing grooves helps to improve the fixing effect of the connecting rod.

[0063] Please refer to Figure 5 In some embodiments, the connection structure further includes a first connecting member 30, which includes a first connecting portion 31 and a second connecting portion 32 arranged in sequence along the first direction. The first connecting portion 31 is limitedly connected to the first limiting portion 12, that is, the first connecting portion 31 is a mating end portion corresponding to the first limiting groove 121, and the second connecting portion 32 is limitedly connected to the second limiting portion, that is, the second connecting portion 32 is a mating end portion corresponding to the second limiting groove, so that the second splicing piece 20 is arranged on one side of the first splicing piece 10 along the first direction, thereby forming a straight domino joint.

[0064] Please refer to Figure 6 In some embodiments, the connection structure includes a second connecting member 40, and the second connecting member 40 includes a first protrusion 41 and a second protrusion 42 arranged opposite to each other along the second direction. The first protrusion 41 is limitedly connected to the first limiting portion 12, that is, the first protrusion 41 is a mating end portion correspondingly connected to the first limiting groove 121, and the second protrusion 42 is limitedly connected to the second limiting portion, that is, the second protrusion 42 is a mating end portion correspondingly connected to the second limiting groove, so that the second splicing piece 20 is arranged on one side of the first splicing piece 10 along the second direction, thereby forming a square domino joint.

[0065] Optionally, the cross-sectional area of ​​the first connecting portion 31 and / or the cross-sectional area of ​​the second connecting portion 32, the cross-sectional area of ​​the first protrusion 41 and / or the cross-sectional area of ​​the second protrusion 42 are all smaller than the cross-sectional area of ​​the corresponding limiting groove, so as to enable a movable connection between the connecting structure and the corresponding splicing piece.

[0066] In some embodiments, the first connecting portion 31 defines a first fixing hole 311 for fixedly connecting to the first position-limiting portion 12; the second connecting portion 32 defines a second fixing hole for fixedly connecting to the second position-limiting portion. Similarly, the first protruding portion 41 defines a third fixing hole 411 for fixedly connecting to the first position-limiting portion 12; the second protruding portion 42 defines a fourth fixing hole 421 for fixedly connecting to the second position-limiting portion.

[0067] This embodiment also provides a spinal internal fixation system, which includes the domino connector described in any of the above solutions. By using the domino connector in this embodiment, the number of components of the internal fixation system is reduced, the cost is reduced, and the time and difficulty of internal fixation are simplified.

[0068] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Domino connector, characterized in that, include: A first splicing piece (10), wherein the first splicing piece (10) is provided with a first mounting hole (11) along a first direction for mounting a connecting rod; and the first splicing piece (10) is provided with first limiting portions (12) on both sides along a second direction, wherein the second direction is perpendicular to the first direction; A second splicing piece (20), wherein the second splicing piece (20) is provided with a second mounting hole (21) along the first direction for mounting a connecting rod; and the second splicing piece (20) is provided with second limiting portions on both sides along the second direction; The second splicing piece (20) is configured to be selectively arranged on one side of the first splicing piece (10) along the first direction or on one side of the first splicing piece (10) along the second direction; A connecting structure, wherein the two mating ends of the connecting structure are respectively connected to the first limiting portion (12) and the second limiting portion, and the connecting structure is used to limit the connection between the first limiting portion (12) and the second limiting portion.

2. The domino connector according to claim 1, characterized in that: The connection structure further comprises a first connection member (30), the first connection member (30) comprising a first connection portion (31) and a second connection portion (32) sequentially arranged along the first direction, the first connection portion (31) being position-limitingly connected to the first limiting portion (12), and the second connection portion (32) being position-limitingly connected to the second limiting portion, so that the second splicing member (20) is arranged on one side of the first splicing member (10) along the first direction.

3. The domino connector according to claim 2, characterized in that: The connection structure includes a second connection member (40), the second connection member (40) includes a first protrusion (41) and a second protrusion (42) arranged opposite to each other along the second direction, the first protrusion (41) is connected to the first limiting portion (12) in a limiting manner, and the second protrusion (42) is connected to the second limiting portion in a limiting manner, so that the second splicing member (20) is arranged on one side of the first splicing member (10) along the second direction.

4. The domino connector according to claim 3, characterized in that: The first connecting portion (31) is provided with a first fixing hole (311), and the first fixing hole (311) is used for fixed connection with the first limiting portion (12); The second connecting portion (32) is provided with a second fixing hole, and the second fixing hole is used for fixed connection with the second limiting portion; The first protruding portion (41) is provided with a third fixing hole (411), and the third fixing hole (411) is used for fixed connection with the first limiting portion (12); The second protruding portion (42) is provided with a fourth fixing hole (421), and the fourth fixing hole (421) is used for fixed connection with the second limiting portion.

5. The domino connector according to claim 1, characterized in that: The first limiting portion (12) comprises a first limiting groove (121) and a first fixing portion (122); the connecting structure is slidably connected to the first limiting groove (121) and can be fixedly connected to the first fixing portion (122); The second limiting portion includes a second limiting groove and a second fixing portion. The connecting structure is slidably connected to the second limiting groove and can be fixedly connected to the second fixing portion.

6. The domino connector according to claim 5, characterized in that: The domino connector further comprises a first fixing member (50), wherein the first fixing member (50) can be passed through the first fixing portion (122) and fixedly connected to the connecting structure; The domino connector further comprises a second fixing member (60), wherein the second fixing member (60) can be passed through the second fixing portion and fixedly connected to the connecting structure.

7. The domino connector according to claim 6, characterized in that: The first assembling piece (10) and the connecting structure are movably connected, and / or the second assembling piece (20) and the connecting structure are movably connected.

8. The domino connector according to claim 7, characterized in that: The cross-sectional area of ​​the first limiting groove (121) is larger than the cross-sectional area of ​​the corresponding matching end portion in the connection structure; and / or the cross-sectional area of ​​the second limiting groove is larger than the cross-sectional area of ​​the corresponding matching end portion in the connection structure.

9. The domino connector according to claim 1, characterized in that: The first splicing piece (10) is provided with a first fixing groove (13) along a third direction, and the first fixing groove (13) is threadedly connected to a first locking piece (70) to lock the connecting rod in the first mounting hole (11); the first direction, the second direction and the third direction are perpendicular to each other. The second splicing piece (20) is provided with a second fixing groove along the third direction, and the second fixing groove is threadedly connected to a second locking piece (80) to lock the connecting rod in the second mounting hole (21).

10. A spinal fixation system, characterized in that: The invention comprises a domino joint according to any one of claims 1 to 9.

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