A fixation rod and spinal rod and fixation system
By using an integrated bending rod and sleeve structure, the problem of straight rods being unable to adapt to kyphosis in existing technologies has been solved, resulting in shorter operation time and improved stability of the fixation system, while reducing the risk of internal fixation caused by metal fatigue.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIJING JISHUITAN HOSPITAL
- Filing Date
- 2025-03-12
- Publication Date
- 2026-07-07
AI Technical Summary
Existing straight pedicle screw-rod systems are difficult to adapt to complex three-dimensional deformities when treating kyphosis, leading to prolonged operation time, increased operational difficulty, and repeated bending that can cause metal fatigue, increasing the risk of internal fixation fracture or loosening.
The device employs a one-piece molded bending rod, a first rod body, and a second rod body structure. The diameter of the bending rod is larger than that of the first and second rod bodies. It is pre-bent to meet the needs of the surgery, reducing repeated operations during the operation. The sleeve enhances the strength and reduces the risk of breakage.
It significantly shortens the operation time, improves the stability and safety of the postoperative fixation system, and reduces the risk of internal fixation fracture or loosening caused by metal fatigue.
Smart Images
Figure CN224461786U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of spinal correction, and more particularly to a fixation rod and spinal rod fixation system. Background Technology
[0002] Kyphosis is a spinal disease that severely affects a patient's appearance and function. The core of its treatment lies in restoring the normal curvature of the spine through osteotomy and corrective surgery, and maintaining the corrective effect using an internal fixation system. Currently, posterior spinal correction surgery commonly uses a straight pedicle screw-rod system for fixation. However, existing techniques have significant drawbacks: the straight rod, due to its limited shape, is difficult to adapt to the complex three-dimensional deformity of kyphosis. During surgery, the surgeon must repeatedly bend the straight rod to match the osteotomy angle, leading to prolonged operation time and increased difficulty. More seriously, repeated bending easily causes metal fatigue, significantly increasing the risk of postoperative internal fixation fracture or loosening, thus affecting the corrective effect or even leading to surgical failure. Utility Model Content
[0003] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a fixation rod and spinal rod fixation system.
[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:
[0005] This application provides:
[0006] A fixing rod, comprising:
[0007] Bending rod;
[0008] The first rod body is coaxially disposed at the end of the bent rod;
[0009] The second rod is coaxially disposed at the end of the bent rod away from the first rod, wherein the diameter of the bent rod is larger than the diameters of the first rod and the second rod, and the bent rod, the first rod and the second rod are integrally formed.
[0010] Furthermore, the bending rod is arc-shaped, and the first rod body and the second rod body are connected by the bending rod to form a preset angle α between them, satisfying: 120°≤α≤150°.
[0011] Furthermore, a first arc surface is formed at the connection between the bent bar and the first bar body, and the bent bar and the first bar body transition through the first arc surface.
[0012] Furthermore, a second arc surface is formed at the connection between the bent bar and the second bar body, and the bent bar and the second bar body are connected by the second arc surface.
[0013] Furthermore, the length of the bending rod is L1, satisfying: 100mm≤L1≤200mm; the diameter of the bending rod is D1, satisfying: 6.5mm≤D1≤7.5mm.
[0014] Furthermore, the first rod and the second rod have the same diameter and length, and the length of the first rod and the second rod is L2, satisfying: 100mm≤L2≤500mm; the diameter of the first rod and the second rod is D2, satisfying: 5mm≤D2≤6mm.
[0015] Furthermore, both the first rod and the second rod are straight rods.
[0016] Furthermore, a sleeve is fitted on the outer surface of the bending rod. The sleeve includes a first cylinder and a second cylinder, the first cylinder and the second cylinder forming a receiving cavity. The sleeve also includes a quick-connect structure, through which the first cylinder and the second cylinder can be detachably connected.
[0017] Furthermore, the quick-assembly structure includes a protrusion on the circumferential surface of one end of the first cylindrical body, a slot formed on the protrusion facing the center of the first cylindrical body, a locking block on the circumferential surface of the second cylindrical body at the location of the protrusion, the locking block extending into the slot for engagement, a first convex plate on the circumferential surface of the end of the first cylindrical body away from the direction of the protrusion, the first convex plate having a first connecting hole through it, a second convex plate on the circumferential surface of the second cylindrical body at the location of the first convex plate, the second convex plate having a second connecting hole through it, the first connecting hole and the second connecting hole being coaxial, and the first connecting hole and the second connecting hole being fixedly connected by screws.
[0018] This application also provides a spinal rod fixation system, comprising:
[0019] Fixing pins;
[0020] Screw plug;
[0021] The fixing rod described in any of the above embodiments is fixed to the fixing nail by the screw plug.
[0022] This application employs an integrally formed bending rod, a first rod body, and a second rod body structure. The diameter of the bending rod is larger than that of the first and second rod bodies. By pre-bending the bending rod, repeated bending operations during surgery can be effectively reduced, significantly shortening the operation time and reducing the risk of internal fixation fracture or loosening due to metal fatigue, thereby improving the stability and safety of the postoperative fixation system.
[0023] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0024] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0025] Figure 1 A schematic diagram of the fixing rod structure of this application is shown;
[0026] Figure 2 A schematic diagram of the sleeve structure of this application is shown;
[0027] Figure 3 This application shows Figure 2 Schematic diagram of cross-section at point AA;
[0028] Figure 4 A schematic diagram of the first cylindrical structure of this application is shown;
[0029] Figure 5 A schematic diagram of the second cylindrical structure of this application is shown;
[0030] Figure 6 A schematic diagram of the structure of the present application is shown, showing the fixed rod and the cylinder in the sleeve state.
[0031] Explanation of key component symbols:
[0032] 100 - Bending bar; 110 - First arc surface; 120 - Second arc surface; 200 - First rod body; 300 - Second rod body; 400 - Sleeve; 410 - First cylinder body; 420 - Second cylinder body; 430 - Receiving cavity; 440 - Quick-release structure; 441 - Protrusion; 4410 - Slot; 442 - Locking block; 443 - First convex plate; 4431 - First connecting hole; 444 - Second convex plate; 4441 - Second connecting hole; 445 - Screw. Detailed Implementation
[0033] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0034] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.
[0035] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0037] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0038] See Figure 1As shown in the figure, this application embodiment provides a fixing rod, which includes a bent rod 100, a first rod body 200 and a second rod body 300. The first rod body 200 is coaxially disposed at the end of the bent rod 100, and the second rod body 300 is coaxially disposed at the end of the bent rod 100 away from the first rod body 200. The diameter of the bent rod 100 is larger than the diameters of the first rod body 200 and the second rod body 300, and the bent rod 100, the first rod body 200 and the second rod body 300 are integrally formed.
[0039] See Figure 1 As shown, the bending rod 100 of this application is curved, so that it can be pre-bent to a preset curvature according to the patient's condition before surgery, thereby meeting the needs of surgery. It is understood that by pre-bending the bending rod 100, it is not necessary to bend it during the operation, thereby reducing the operation time.
[0040] In one embodiment, the diameter of the bending rod 100 is larger than that of the first rod 200 and the second rod 300, so that it may break or bend excessively under subsequent force. It is understood that the larger diameter of the bending rod 100 can withstand greater force and prevent deformation and breakage during use, which may affect the surgical outcome.
[0041] Furthermore, the bending rod 100, the first rod body 200, and the second rod body 300 are integrally formed, thereby increasing the strength of the three components and making them less prone to breakage, thus reducing the wind direction in which breakage occurs.
[0042] In this embodiment, the bending rod 100, the first rod body 200 and the second rod body 300 are integrally formed from materials such as titanium alloy or cobalt-chromium-molybdenum alloy, which have low rejection phenomena. The specific type of metal or alloy is not limited here and can be selected as needed.
[0043] Both the first rod 200 and the second rod 300 are straight rods.
[0044] The bending rod 100 is arc-shaped, and the first rod body 200 and the second rod body 300 are connected by the bending rod 100 to form a preset angle α between them, satisfying: 120°≤α≤150°.
[0045] Please continue reading. Figure 1As shown, in order to form a certain angle between the first rod 200 and the second rod 300 to meet the patient's surgical needs, the bending rod 100 is first bent to a certain arc to make it arc-shaped. At this time, the first rod 200 and the second rod 300 will form a preset angle α as the first rod 200 is bent. The angle α is usually between 120° and 150°. For example, α can be 120, 125, 130, 135, 140, 145, 150, etc. In practice, the rod can be fixed at different angles by selecting or bending according to the patient's needs.
[0046] like Figure 1 As shown, the bent rod 100, after being bent, forms a V-shaped rod body with the first rod body 200 and the second rod body 300.
[0047] A first arc surface 110 is formed at the connection between the bent rod 100 and the first rod body 200, and the bent rod 100 and the first rod body 200 are transitioned through the first arc surface 110.
[0048] A second arc surface 120 is formed at the connection between the bending rod 100 and the second rod body 300, and the bending rod 100 and the second rod body 300 are transitionally connected through the second arc surface 120.
[0049] See Figure 1 As shown, in order to prevent stress concentration fracture at the connection between the first rod 200 and the bent rod 100 and at the connection between the second rod 300 and the bent rod 100, a first arc surface 110 is provided at the connection between the first rod 200 and the bent rod 100 and at the connection between the second rod 300 and the bent rod 100. The first arc surface 110 serves as a transition, effectively dispersing the stress concentration phenomenon at the connection, reducing the local stress peak, and reducing the risk of fracture caused by stress concentration.
[0050] Furthermore, the first arc surface 110 can also be replaced by an inclined surface, that is, the bending rod 100 and the first rod 200 and the bending rod 100 and the second rod 300 are connected by an inclined surface, which can reduce the risk of stress concentration leading to fracture to a certain extent.
[0051] The length of the bending rod 100 is L1, which satisfies: 100mm≤L1≤200mm; the diameter of the bending rod 100 is D1, which satisfies: 6.5mm≤D1≤7.5mm.
[0052] In this embodiment, the length L1 of the bending bar 100 can be 100mm, 120mm, 140mm, 160mm, 180mm, 200mm, etc., and can be selected as needed in practice, including but not limited to the above data. The diameter D1 of the bending bar 100 can be selected as 6.5mm, 7.5mm, etc., and can be designed and used as needed in practice.
[0053] The first rod 200 and the second rod 300 have the same diameter and length. The length of the first rod 200 and the second rod 300 is L2, which satisfies: 100mm≤L2≤500mm. The diameter of the first rod 200 and the second rod 300 is D2, which satisfies: 5mm≤D2≤6mm.
[0054] In this embodiment, the lengths of the first rod 200 and the second rod 300 can be selected as 100, 200, 300, 400, 500, etc., and can be selected and used according to actual needs. The lengths of the first rod 200 and the second rod 300 include, but are not limited to, the above parameters, and are not specifically limited here. The diameters of the first rod 200 and the second rod 300 are also the same. In order to meet the requirement that the diameter is smaller than that of the bent rod 100, it is necessary to satisfy: D2 < D1. Specifically, the diameters of the first rod 200 and the second rod 300 can be parameter values such as 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm, 6mm, etc., and can be selected and used according to actual needs, and are not limited here.
[0055] The outer surface of the bending rod 100 is fitted with a sleeve 400. The sleeve 400 includes a first cylindrical body 410 and a second cylindrical body 420. The first cylindrical body 410 and the second cylindrical body 420 form a receiving cavity 430. The sleeve 400 also includes a quick-connect structure 440. The first cylindrical body 410 and the second cylindrical body 420 are detachably connected through the quick-connect structure 440.
[0056] Please see Figure 2 , Figure 3 , Figure 4 as well as Figure 5 As shown, in order to further improve the strength of the bending rod 100 and prevent it from breaking due to stress, a sleeve 400 is fitted on the bending rod 100. The sleeve 400 is used to improve the strength of the bending rod 100 and reduce the risk of its breakage. The sleeve 400 has a wall thickness of 1.5-2mm and is made of the same material as the fixed rod.
[0057] Please continue reading. Figures 2 to 5As shown, this application uses a receiving cavity 430 formed by connecting the first cylinder 410 and the second cylinder 420 to accommodate the bent rod 100. It can be understood that the diameter of the receiving cavity 430 is adapted to the diameter of the bent rod 100, so that the outer wall of the bent rod 100 abuts against the outer wall of the receiving cavity 430, preventing the bent rod 100 from loosening or shaking in the receiving cavity 430. During installation, the first cylinder 410 and the second cylinder 420 are first fitted onto the bent rod 100, and finally the connection and fixation of the first cylinder 410 and the second cylinder 420 are achieved through the quick-installation structure 440.
[0058] The quick-assembly structure 440 includes a protrusion 441 on the peripheral surface of one end of the first cylindrical body 410, a slot 4410 formed on the protrusion 441 toward the center of the first cylindrical body 410, a locking block 442 on the peripheral surface of the second cylindrical body 420 at the position of the protrusion 441, the locking block 442 extending into the slot 4410 for engagement, a first convex plate 443 on the peripheral surface of the end of the first cylindrical body 410 away from the protrusion 441, a first connecting hole 4431 formed through the first convex plate 443, a second convex plate 444 on the peripheral surface of the second cylindrical body 420 at the position of the first convex plate 443, a second connecting hole 4441 formed through the second convex plate 444, the first connecting hole 4431 and the second connecting hole 4441 being coaxial and fixedly connected by screws 445.
[0059] Please continue reading. Figures 2 to 5As shown, in this embodiment, the quick-connect structure 440 has multiple sets distributed on the outer circumferential surface of the annulus formed by the first cylinder 410 and the second cylinder 420. Specifically, the quick-connect structure 440 is located at the connection position of the first cylinder 410 and the second cylinder 420. Furthermore, when it is necessary to fix the first cylinder 410 and the second cylinder 420, the locking block 442 is first inserted into the locking groove 4410, and the connecting surfaces of the first cylinder 410 and the second cylinder 420 are brought into contact. At this time, the surfaces of the first protrusion 443 and the second protrusion 444 are close to each other and are in contact, and the first connecting hole 4431 and the second connecting hole 4441 are coaxial. Further, in order to enable the first protrusion... Plate 443 and the second convex plate 444 are fixed together to connect the first cylinder 410 and the second cylinder 420. An internal thread is formed on the inner wall of the first connecting hole 4431, and the second connecting hole 4441 is a through hole. A screw 445 passes through the second connecting hole 4441 and is threaded into the first connecting hole 4431. As the screw 445 continues to tighten, the second convex plate 444 and the first convex plate 443 are tightly fixed together. Because the other end is secured by the slot 4410 and the locking block 442, the first cylinder 410 and the second cylinder 420 are completely joined and fitted onto the first arc surface 110. The state after the sleeve 400 and the bending rod 100 are fitted and installed can be referenced. Figure 6 As shown.
[0060] In another embodiment, an internal thread can be provided in the second connecting hole 4441, and the first connecting hole 4431 is a through hole. The screw 445 can pass through the first connecting hole 4431 to the second connecting hole 4441 for threaded connection.
[0061] Please continue reading. Figure 3 , Figure 4 as well as Figure 5 As shown, the card slot 4410 is triangular, and the end of the card block 442 facing the card slot 4410 is also a triangle that matches the card slot 4410. For example, the card block 442 and the card slot 4410 adopt a dovetail groove mating method.
[0062] This application embodiment also provides a spinal screw-rod fixation system, which includes a fixation screw, a screw plug, and any of the fixation rods described above. The fixation rod is fixed to the fixation screw by the screw plug. In this embodiment, the fixation screw can be a pedicle screw. First, the pedicle screw is placed into the bone, and then the fixation rod is placed into the groove of the pedicle screw. Finally, the fixation rod is fixed by screwing the screw plug and the pedicle screw together. During this process, the pressure on the fixation rod gradually completes the selection and lifting of the caudal vertebral body at the osteotomy end. Afterwards, the sleeve 400 can be selectively used to fit onto the bending rod 100 as needed.
[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0064] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. A fixing rod, characterized in that, include: Bending bar (100); The first rod (200) is coaxially disposed at the end of the bent rod (100); The second rod (300) is coaxially disposed at the end of the bent rod (100) away from the first rod (200), wherein the diameter of the bent rod (100) is greater than the diameters of the first rod (200) and the second rod (300), and the bent rod (100), the first rod (200) and the second rod (300) are integrally formed.
2. The fixing rod according to claim 1, characterized in that, The bending rod (100) is arc-shaped. The first rod (200) and the second rod (300) are connected by the bending rod (100) to form a preset angle α between them, satisfying: 120°≤α≤150°.
3. The fixing rod according to claim 1, characterized in that, The bending rod (100) and the first rod body (200) are connected to form a first arc surface (110), and the bending rod (100) and the first rod body (200) are transitioned through the first arc surface (110).
4. The fixing rod according to claim 1, characterized in that, A second arc surface (120) is formed at the connection between the bent rod (100) and the second rod body (300), and the bent rod (100) and the second rod body (300) are connected by the second arc surface (120).
5. The fixing rod according to claim 1, characterized in that, The length of the bending rod (100) is L1, which satisfies: 100mm≤L1≤200mm; the diameter of the bending rod (100) is D1, which satisfies: 6.5mm≤D1≤7.5mm.
6. The fixing rod according to claim 1, characterized in that, The first rod (200) and the second rod (300) have the same diameter and length. The length of the first rod (200) and the second rod (300) is L2, which satisfies: 100mm≤L2≤500mm; the diameter of the first rod (200) and the second rod (300) is D2, which satisfies: 5mm≤D2≤6mm.
7. The fixing rod according to claim 1, characterized in that, Both the first rod (200) and the second rod (300) are straight rods.
8. The fixing rod according to claim 1, characterized in that, A sleeve (400) is fitted on the outer surface of the bending rod (100). The sleeve (400) includes a first cylinder (410) and a second cylinder (420). The first cylinder (410) and the second cylinder (420) form a receiving cavity (430). The sleeve (400) also includes a quick-connect structure (440). The first cylinder (410) and the second cylinder (420) are detachably connected through the quick-connect structure (440).
9. The fixing rod according to claim 8, characterized in that, The quick-assembly structure (440) includes a protrusion (441) on the circumferential surface of one end of the first cylindrical body (410), a slot (4410) being formed on the protrusion (441) facing the center of the first cylindrical body (410), a locking block (442) being formed on the circumferential surface of the second cylindrical body (420) at the location of the protrusion (441), the locking block (442) extending into the slot (4410) for engagement, and a first end peripheral surface of the first cylindrical body (410) away from the direction of the protrusion (441) being formed. A first protruding plate (443) is provided with a first connecting hole (4431) through the first protruding plate (443). A second protruding plate (444) is provided on the circumferential surface of the second cylinder (420) at the position of the first protruding plate (443). A second connecting hole (4441) is provided on the second protruding plate (444). The first connecting hole (4431) and the second connecting hole (4441) are coaxial and are fixedly connected by screws (445).
10. A spinal rod-and-spindle fixation system, characterized in that, include: Fixing pins; Screw plug; The fixing rod according to any one of claims 1 to 9, wherein the fixing rod is fixed to the fixing nail by the screw plug.