Spine elastic fixing rod and spine fixing system

Abstract

The utility model belongs to the technical field of medical instruments, and particularly discloses a spine elastic fixing rod and a spine fixing system. The elastic spine fixing rod comprises a mandrel, an elastic sleeve and a connecting piece, and a first connecting hole extending in the radial direction of the mandrel is formed in one end of the mandrel; the elastic sleeve is arranged on the peripheral surface of the mandrel, and a second connecting hole extending in the radial direction of the elastic sleeve is formed in the position, corresponding to the first connecting hole, of the elastic sleeve; and the connecting piece is inserted into the first connecting hole and the second connecting hole so as to connect the elastic sleeve and the mandrel. According to the elastic spine fixing rod, the use safety and the adaptability to physiological activities of a human body can be improved.

Description

Technical Field

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

[0002] Elastic spinal fixation rods are increasingly being used due to their better adaptability and biomechanical properties. Elastic spinal fixation rods in related technologies are available in the form of solid round rods and a combination of a core shaft and an elastic sleeve. A single solid round rod can only achieve rigid fixation, which can easily cause degeneration of adjacent stages. In the form of a combination of a core shaft and an elastic sleeve, the elastic sleeve is arranged on the outer circumference of the core shaft, and a limiting structure is provided on the outside of the core shaft and the inner wall of the elastic sleeve to ensure the relative axial stability between the elastic sleeve and the core shaft. Due to the provision of the limiting structure, a plurality of openings need to be provided at circumferential intervals on the outer wall of the elastic sleeve to facilitate the installation of the core shaft in the elastic sleeve. However, the provision of the openings reduces the overall rigidity, affecting the safety of use. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the embodiment of the present invention provides a spinal elastic fixation rod that can improve the safety of use and the adaptability to human physiological activities.

[0004] The embodiment of the present utility model further provides a spinal fixation system.

[0005] The spinal elastic fixation rod of an embodiment of the utility model includes a core shaft, an elastic sleeve and a connecting piece, wherein one end of the core shaft is provided with a first connecting hole extending radially thereof; the elastic sleeve is provided on the outer peripheral surface of the core shaft, and a second connecting hole extending radially thereof is provided on the elastic sleeve corresponding to the first through hole; the connecting piece is inserted into the first connecting hole and the second connecting hole to connect the elastic sleeve and the core shaft.

[0006] The spinal elastic fixation rod in this embodiment features an elastic member on the outer circumference of the core shaft. This provides a certain degree of rigidity while also exhibiting excellent elasticity, promoting bone fusion. It also minimizes restrictions on physiological activities such as bending and twisting, improving adaptability. Furthermore, the elastic sleeve and core shaft are connected by a connector. The second connecting holes are distributed radially along the elastic sleeve, ensuring a stable connection between the sleeve and core shaft. This avoids the need for axially extending openings at the elastic end, improving the rigidity of the elastic member and reducing the risk of tearing when subjected to stress, thereby enhancing safety.

[0007] In this embodiment, the first connecting hole passes through the core shaft, the second connecting hole passes through the elastic sleeve, and both ends of the connecting member are located in the second connecting hole.

[0008] In this embodiment, the diameters of both ends of the second connecting hole are larger than the diameter of the middle part, a ball cap is provided at one end of the connecting piece, and a rivet hole is provided at the other end of the connecting piece, so that the connecting piece cooperates with the second connecting hole to limit the connecting piece.

[0009] In this embodiment, an abutment portion is provided on the inner wall of one end of the elastic sleeve away from the connecting piece, and a stop portion is provided on one end of the core shaft adjacent to the abutment portion. In the direction away from the connecting piece, the stop portion and the abutment portion are provided in sequence to limit the deformation of the elastic sleeve through the cooperation of the stop portion and the abutment portion.

[0010] In this embodiment, the connecting member is cylindrical, the diameter of the connecting member is D1, the radius of the elastic sleeve is R1, and D1≤R1.

[0011] In this embodiment, in the axial direction of the elastic sleeve, the middle section of the elastic sleeve is provided with a spiral groove extending along the axial direction of the elastic sleeve.

[0012] In this embodiment, grooves are provided on the side wall of the elastic sleeve at both ends corresponding to the spiral groove, and the grooves are communicated with the spiral groove.

[0013] In this embodiment, the diameter of the groove is D2, the radius of the elastic sleeve is R1, and D2≤R1.

[0014] In this embodiment, an interface is provided at the end of the elastic sleeve adjacent to the connecting piece.

[0015] The spinal fixation system of the embodiment of the present invention includes the above-mentioned spinal elastic fixation rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a side structural schematic diagram of the spinal elastic fixation rod according to an embodiment of the present utility model.

[0017] Figure 2 It is a three-dimensional diagram of the spinal elastic fixation rod according to an embodiment of the present utility model.

[0018] Figure 3 It is a cross-sectional view of a spinal elastic fixation rod according to an embodiment of the present utility model.

[0019] Figure 4 It is an exploded view of the spinal elastic fixation rod according to an embodiment of the present utility model.

[0020] Figure 5 It is a structural schematic diagram of the core shaft of an embodiment of the present utility model.

[0021] Figure 6 It is a structural schematic diagram of the elastic sleeve according to an embodiment of the present utility model.

[0022] Figure 7 It is a structural schematic diagram of a connecting piece according to an embodiment of the present utility model.

[0023] Reference numerals:

[0024] 1. Mandrel; 11. First connecting hole; 12. Stopper;

[0025] 2. Elastic sleeve; 21. Second connecting hole; 22. Abutment portion; 23. Spiral groove; 24. Groove; 25. Interface;

[0026] 3. Connector; 31. Ball cap; 32. Rivet hole. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0028] In this embodiment, if Figures 1 to 4 As shown, the spinal elastic fixation rod includes a core shaft 1, an elastic sleeve 2 and a connecting piece 3. A first connecting hole 11 extending radially thereof is provided at one end of the core shaft 1; the elastic sleeve 2 is provided on the outer circumferential surface of the core shaft 1, and a second connecting hole 21 extending radially thereof is provided on the elastic sleeve 2 corresponding to the first through hole; the connecting piece 3 is inserted into the first connecting hole 11 and the second connecting hole 21 to connect the elastic sleeve 2 and the core shaft 1.

[0029] Specifically, one first connection hole 11 can be provided, or multiple first connection holes 11 can be provided at intervals along the circumference of the core shaft 1. Each first connection hole 11 corresponds to a second connection hole 21, and each set of corresponding first connection holes 11 and second connection holes 21 corresponds to a connector 3. The number of connectors 3 can be set as needed and is not limited here. The diameter and length of the core shaft 1 and the elastic sleeve 2 can be set to different specifications to adapt to different application scenarios, and the specific dimensions of each specification are not limited here.

[0030] The spinal elastic fixation rod in this embodiment features an elastic member disposed on the outer circumference of the core shaft 1. While providing a certain degree of rigidity, it also exhibits excellent elasticity, promoting bone fusion and minimizing restrictions on physiological activities such as bending and twisting, thereby enhancing adaptability. Furthermore, the elastic sleeve 2 and core shaft 1 are connected by a connector 3. Second connecting holes 21 are distributed radially along the elastic sleeve 2, providing a stable connection between the sleeve 2 and core shaft 1 and avoiding the need for axially extending openings at the elastic end. This improves the rigidity of the elastic member and reduces the risk of tearing when subjected to stress, thereby enhancing safety in use.

[0031] In this embodiment, if Figures 3 to 6As shown, the first connecting hole 11 passes through the core shaft 1 , the second connecting hole 21 passes through the elastic sleeve 2 , and both ends of the connecting member 3 are located in the second connecting hole 21 .

[0032] Specifically, both ends of the connector 3 are located in the second connecting hole 21 , that is, both ends of the connector 3 do not protrude from the outer wall of the elastic sleeve 2 , thereby preventing the connector 3 from protruding and affecting the setting of the spinal elastic fixation rod.

[0033] It can be understood that when the first connecting hole 11 passes through the core shaft 1 and the second connecting hole 21 passes through the sleeve, the elastic sleeve 2 and the core shaft 1 can be reliably connected by passing a connecting piece 3 through the core shaft 1 and the elastic sleeve 2, thereby simplifying the overall structure.

[0034] In this embodiment, if Figure 3 and Figure 7 As shown, the diameters of both ends of the second connecting hole 21 are larger than the diameter of the middle part, a ball cap 31 is provided at one end of the connecting member 3, and a rivet hole 32 is provided at the other end of the connecting member 3 to enable the connecting member 3 to cooperate with the second connecting hole 21 to limit the connecting member 3.

[0035] Specifically, if Figure 3 and Figure 4 As shown, the diameters of both ends of the second connecting hole 21 are larger than the diameter of the middle portion, that is, both ends of the second connecting hole 21 are countersunk, and the countersunk holes can be cylindrical holes or conical holes.

[0036] It should be noted that when the connecting member 3 is inserted into the first connecting hole 11 and the second connecting hole 21, one end of the connecting member 3 can abut against the boss at one end of the second connecting hole 21, and the other end can be riveted to the second connecting hole 21 through the rivet hole 32, thereby limiting the two ends of the connecting member 3, so that the connecting member 3 can be reliably fixed in the first connecting hole 11 and the second connecting hole 21, thereby reliably fixing the core shaft 1 and the elastic sleeve 2.

[0037] In this embodiment, if Figures 3 to 5 As shown, an abutment portion 22 is provided on the inner wall of the end of the elastic sleeve 2 away from the connecting member 3, and a stop portion 12 is provided on the end of the core shaft 1 adjacent to the abutment portion 22. In the direction away from the connecting member 3, the stop portion 12 and the abutment portion 22 are provided in sequence to limit the deformation of the elastic sleeve 2 through the cooperation of the stop portion 12 and the abutment portion 22.

[0038] For example, the abutment portion 22 is an annular protrusion provided on the inner wall of the elastic sleeve 2, and the stop portion 12 is a shoulder formed on the core shaft 1. That is, the core shaft 1 is a stepped shaft, thereby forming a shoulder between the two shaft sections. Specifically, when the end of the elastic sleeve 2 away from the connector 3 is in an extended state, the stop portion 12 and the abutment portion 22 are sequentially spaced apart in the direction away from the connector 3, allowing the elastic sleeve 2 to slide a predetermined distance relative to the core shaft 1 along the axial direction of the core shaft 1. The sliding range of the elastic sleeve 2 is limited by the cooperation of the abutment portion 22 and the stop portion 12.

[0039] It can be understood that the elastic sleeve 2 and the core shaft 1 are fixed on one side by the connecting piece 3, and the elastic sleeve 2 can slide relative to the core shaft 1 at the end away from the connecting piece 3, and has a certain deformation amount. Through the cooperation of the abutment portion 22 and the stop portion 12, the deformation amount of the elastic sleeve 2 can be limited, so that the elastic sleeve 2 has a certain deformation amount, and at the same time, the deformation amount range is limited to avoid the elastic sleeve 2 having an excessively large deformation amount that affects its use.

[0040] In this embodiment, if Figure 3 and Figure 4 As shown, the connecting member 3 is cylindrical, the diameter of the connecting member 3 is D1, the radius of the elastic sleeve 2 is R1, and D1≤R1.

[0041] Specifically, D1≤R1, that is, the diameter of the connecting member 3 can be less than or equal to the diameter of the elastic sleeve 2. The diameter of the connecting member 3 can be adjusted according to actual conditions and is not limited here.

[0042] The connecting member 3 is arranged to be cylindrical, which is convenient for processing and installation. Of course, the connecting member 3 can also be arranged to other shapes, for example, a polygonal column, which is not limited here.

[0043] It can be understood that if the diameter of the connecting member 3 is too large, the corresponding diameter of the second connecting hole 21 will be larger. If the diameter of the second connecting hole 21 is too large, the elastic sleeve 2 will be easily torn at the second connecting hole 21. Therefore, the diameter D1 of the connecting member 3 is less than or equal to the radius R1 of the elastic sleeve 2, which is conducive to ensuring the strength of the elastic sleeve 2 and improving the safety of use.

[0044] In this embodiment, if Figure 6 As shown, in the axial direction of the elastic sleeve 2 , the middle section of the elastic sleeve 2 is provided with a spiral groove 23 extending along the axial direction of the elastic sleeve 2 .

[0045] Specifically, the spiral groove 23 runs through the side wall of the elastic sleeve 2, which can make the elastic force of the elastic sleeve 2 greater. The specifications of the spiral groove 23 (for example, the pitch, the width of the spiral groove 23 and the spiral angle, etc.) can be set as needed and are not limited here.

[0046] It can be understood that by providing a spiral groove 23 extending along the axial direction of the elastic sleeve 2, external forces can be absorbed or dispersed, the bending and torsion resistance of the elastic sleeve 2 can be improved, the elastic range of the elastic sleeve 2 can be improved, stress concentration can be avoided, and the risk of fracture caused by excessive local stress can be reduced, thereby improving the overall strength and service life.

[0047] In this embodiment, if Figure 3 and Figure 6 As shown, grooves 24 are provided on the side wall of the elastic sleeve 2 at both ends corresponding to the spiral groove 23 , and the grooves 24 are communicated with the spiral groove 23 .

[0048] Specifically, the groove 24 can be a regular semicircular shape or other irregular arc shape. The specific shape of the groove 24 is not limited here. The inner walls of the groove 24 at both ends are respectively connected to the two inner walls of the spiral groove 23, and one of the inner walls of the groove 24 is tangent to the helical angle of the spiral groove 23, which can effectively disperse stress.

[0049] It is understandable that by providing grooves 24 at both ends of the spiral groove 23, the stress at the end of the spiral groove 23 can be dispersed through the grooves 24, reducing the risk of fracture due to stress concentration, which is conducive to improving safety and reliability in use.

[0050] In this embodiment, the diameter of the groove 24 is D2, the radius of the elastic sleeve 2 is R1, and D2≤R1.

[0051] It is understandable that if the diameter of the groove 24 is too large, the elastic sleeve 2 will easily tear in the groove 24. In this embodiment, the diameter D2 of the groove 24 is set to be less than or equal to the radius of the elasticity, which can release stress through the groove 24 while ensuring the overall strength of the elastic sleeve 2.

[0052] In this embodiment, if Figure 4 and Figure 6 As shown, an interface 25 is provided at the end of the elastic sleeve 2 adjacent to the connecting piece 3 .

[0053] Specifically, the cross-sectional outer contour of the interface 25 is a hexagon, which facilitates the connection between the elastic sleeve 2 and other devices. The shape of the interface 25 is not intended to limit the present invention, and those skilled in the art can set it as needed, which is not limited here.

[0054] It is understandable that by providing the interface 25 on the elastic sleeve 2 , the elastic sleeve 2 can be connected to other devices through the interface 25 , making it easier to install the elastic sleeve 2 .

[0055] The spinal fixation system in this embodiment includes the above-mentioned spinal elastic fixation rod.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0058] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0059] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0060] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0061] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A spinal elastic fixation rod, characterized in that: include: A core shaft, wherein one end of the core shaft is provided with a first connecting hole extending in its radial direction; an elastic sleeve, the elastic sleeve being arranged on the outer circumference of the core shaft, and the elastic sleeve being provided with a second connecting hole extending radially thereof corresponding to the first connecting hole; A connecting piece is inserted into the first connecting hole and the second connecting hole to connect the elastic sleeve and the core shaft.

2. The spinal elastic fixation rod according to claim 1, characterized in that: The first connecting hole passes through the core shaft, the second connecting hole passes through the elastic sleeve, and both ends of the connecting member are located in the second connecting hole.

3. The spinal elastic fixation rod according to claim 2, characterized in that: The diameters of both ends of the second connecting hole are larger than the diameter of the middle part. A ball cap is provided at one end of the connecting piece, and a rivet hole is provided at the other end of the connecting piece so that the connecting piece cooperates with the second connecting hole to limit the connecting piece.

4. The spinal elastic fixation rod according to claim 1, characterized in that: An abutment portion is provided on the inner wall of one end of the elastic sleeve away from the connecting piece, and a stop portion is provided on one end of the core shaft adjacent to the abutment portion. In the direction away from the connecting piece, the stop portion and the abutment portion are provided in sequence to limit the deformation of the elastic sleeve through the cooperation of the stop portion and the abutment portion.

5. The spinal elastic fixation rod according to claim 1, characterized in that: The connecting piece is cylindrical, the diameter of the connecting piece is D1, the radius of the elastic sleeve is R1, and D1≤R1.

6. The spinal elastic fixation rod according to claim 1, characterized in that: In the axial direction of the elastic sleeve, a middle section of the elastic sleeve is provided with a spiral groove extending along the axial direction of the elastic sleeve.

7. The spinal elastic fixation rod according to claim 6, characterized in that: Grooves are provided on the side wall of the elastic sleeve at both ends corresponding to the spiral groove, and the grooves are communicated with the spiral groove.

8. The spinal elastic fixation rod according to claim 7, characterized in that: The diameter of the groove is D2, the radius of the elastic sleeve is R1, and D2≤R1.

9. The spinal elastic fixation rod according to any one of claims 1 to 8, characterized in that: The elastic sleeve is provided with an interface at the end adjacent to the connecting piece.

10. A spinal fixation system, characterized in that: The invention comprises the spinal elastic fixation rod according to any one of claims 1 to 9.

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