Growth rod and orthopedic fixation system

Abstract

The utility model relates to a growing rod and an orthopedic fixing system, the growing rod comprises an inner core and a sleeve, the inner core is a memory metal component, a channel is arranged in the sleeve, the inner core is slidably arranged in the channel in a penetrating manner, the sleeve comprises a deformation section, and the deformation section can extend along the extension direction of the inner core under the action of external force. The growth rod can correspondingly extend along with the growth of the spine of a patient, so that the risk of complications and the like caused by repeated open operations can be reduced, and the spine orthopedic effect is better.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a growth rod and an orthopedic fixation system. Background Technology

[0002] Growth rod technology is a non-fusion corrective surgery used for early-onset scoliosis in children or idiopathic scoliosis in adolescents. It is generally used for growing and developing minors, preserving the spine's growth potential while maintaining coronal and sagittal plane balance, and allowing continued thoracic growth, thus improving thoracic volume and cardiopulmonary function. In related techniques, growth rods typically require repeated open surgeries to ensure normal spinal growth; that is, patients need to undergo growth rod lengthening surgery periodically. However, this surgical approach significantly increases the risk of complications. Utility Model Content

[0003] This utility model aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of this utility model propose a growth rod that can extend accordingly as the patient's spine grows, which helps to reduce the risk of complications caused by repeated open surgeries and has a better spinal correction effect.

[0005] An embodiment of this utility model also proposes an orthopedic fixation system.

[0006] The growth rod of this utility model includes: an inner core, which is a shape memory metal component; a sleeve, which has a channel inside, and the inner core is slidably inserted into the channel. The sleeve includes a deformation section, which can extend along the extension direction of the inner core under the action of external force.

[0007] According to the embodiments of this utility model, the growth rod has a core made of shape memory metal, which can be prefabricated in advance according to the patient's spinal deformity before surgery, thereby providing a normal growth trajectory for the patient's spine. The sleeve is fitted outside the core to provide support for the spine. Since the deformable section of the sleeve can extend along the extension direction of the core under the action of external force, the overall length of the sleeve can be extended accordingly when the patient's spine grows. Therefore, the growth rod can be extended without open surgery, reducing the risk of complications caused by repeated open surgery, and the spinal correction effect is better.

[0008] In some embodiments, the deformable segment has a plurality of folds, which are arranged sequentially along the length direction of the inner core, and the folds can extend along the extension direction of the inner core under the action of external force.

[0009] In some embodiments, when the growth rod is in its initial state, the length of the inner core is greater than that of the sleeve, and the inner core protrudes from one end of the sleeve.

[0010] In some embodiments, the deformable segment is spirally wound around the inner core along the extending direction of the inner core, and the deformable segment is elastic.

[0011] In some embodiments, the sleeve further includes a constant section with a fixed length, a portion of the channel being located within the constant section and another portion of the channel being located within the deformation section, the constant section being connected to the deformation section.

[0012] In some embodiments, the constant segment and the deformable segment are integrally formed.

[0013] In some embodiments, there are two constant segments, which are respectively arranged at both ends of the extension direction of the deformation segment.

[0014] In some embodiments, there are multiple deformation segments, which are arranged at intervals along the extension direction of the sleeve.

[0015] In some embodiments, the sleeve is a titanium alloy component.

[0016] Another embodiment of the orthopedic fixation system of the present invention includes the growth rod described in any one of the embodiments of the present invention.

[0017] According to the orthopedic fixation system of this utility model, since the inner core is a memory metal component, the inner core can be prefabricated in advance according to the patient's spinal deformity before surgery, thereby providing the patient's spine with a normal growth trajectory. The sleeve is sleeved outside the inner core to provide support for the spine. Since the deformable section of the sleeve can extend along the extension direction of the inner core under the action of external force, the overall length of the sleeve can be extended accordingly when the patient's spine grows. Therefore, the growth rod can be extended without open surgery, reducing the risk of complications caused by repeated open surgery, and the spinal correction effect is better. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the initial state of the growth rod according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the extended state of the growth rod according to an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the inner core of the growth rod according to an embodiment of the present invention.

[0021] Figure 4This is a schematic diagram of the sleeve of the growth rod according to an embodiment of the present invention.

[0022] Figure 5 This is a cross-sectional view of the sleeve of the growth rod according to an embodiment of the present invention.

[0023] Figure label:

[0024] 1. Inner core;

[0025] 2. Sleeve; 21. Channel; 22. Deformation section; 23. Constant section. Detailed Implementation

[0026] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] The following is a reference appendix. Figures 1 to 5 This invention describes a growth rod and an orthopedic fixation system according to embodiments of the present invention.

[0028] like Figures 1 to 5 As shown, the growth rod of this utility model embodiment includes an inner core 1 and a sleeve 2. The inner core 1 is a shape memory metal component, and the sleeve 2 has a channel 21. The inner core 1 is slidably inserted into the channel 21. The sleeve 2 includes a deformation section 22, which can extend along the extension direction of the inner core 1 under the action of external force.

[0029] According to the embodiments of the present invention, the growth rod has an inner core 1 made of shape memory metal, which can be prefabricated in advance according to the patient's spinal deformity before surgery, thereby providing a normal growth trajectory for the patient's spine. The sleeve 2 is sleeved outside the inner core 1 to provide support for the spine. Since the deformable section 22 of the sleeve 2 can extend along the extension direction of the inner core 1 under the action of external force, the overall length of the sleeve 2 can be extended accordingly when the patient's spine grows. Therefore, the growth rod can be extended without open surgery, reducing the risk of complications caused by repeated open surgery, and the spinal correction effect is better.

[0030] Understandably, the cannula 2 is used to connect to the vertebrae on the spine. As the spine grows, the deformable segment 22 can extend accordingly under the traction force of the spine, thereby increasing the overall length of the cannula 2.

[0031] Optionally, such as Figure 1 As shown, when the growth rod is in its initial state, the length of the inner core 1 is greater than that of the sheath 2, and the inner core 1 protrudes from one end of the sheath 2. It can be understood that when the growth rod is in its initial state, i.e., before or immediately after implantation, the length of the inner core 1 is slightly longer than that of the sheath 2, and at this time, one end of the inner core 1 can protrude from the sheath 2. Figure 2 As shown, when the growth rod is stretched by the growth of the spine, the sleeve 2 can gradually extend along the extension direction of the inner core 1 until the entire inner core 1 is placed inside the sleeve 2. That is, after the growth rod is stretched, the length of the inner core 1 can be less than the length of the sleeve 2, thereby improving the guiding effect of the inner core 1.

[0032] In one example, such as Figure 4 and Figure 5 As shown, the deformable segment 22 can be a spring-like threaded structure. In other words, the deformable segment 22 is spirally wound around the inner core 1 along the extension direction of the inner core 1, and the deformable segment 22 is elastic. Thus, when the growth rod is stretched by the growth of the spine, the pitch of the deformable segment 22 gradually increases, which can both extend the overall length of the growth rod and ensure that the cannula 2 has sufficient support, resulting in good stability after implantation.

[0033] In other examples, the deformable segment 22 has multiple folds (not shown) arranged sequentially along the length of the inner core 1. These folds can extend along the extension direction of the inner core 1 under external force. It is understood that the deformable segment 22 can be a corrugated tubular structure. When the growth rod is stretched by the growth of the spine, the length of the corrugated tubular deformable segment 22 can gradually lengthen, i.e., the multiple folds gradually extend, thereby extending the overall length of the growth rod and providing good support.

[0034] In some embodiments, such as Figure 4 and Figure 5 As shown, the sleeve 2 also includes a constant section 23, the length of which is fixed. Part of the channel 21 is located within the constant section 23, and another part of the channel 21 is located within the deformable section 22. The constant section 23 is connected to the deformable section 22. It can be understood that in this embodiment of the invention, only a portion of the sleeve 2 of the growth rod can extend under external force, while the remaining portion has a fixed length. This ensures that the sleeve 2 has sufficient support, preventing misalignment and jamming of the inner core 1 and the sleeve 2 during spinal growth, thus improving the spinal orthopedic effect.

[0035] Optionally, the constant segment 23 and the deformable segment 22 are integrally formed. In other words, the constant segment 23 and the deformable segment 22 are an integral structural component, which can ensure the structural strength of the sleeve 2, reduce the risk of breakage at the connection point between the constant segment 23 and the deformable segment 22 during spinal growth, and facilitate doctors to assemble the growth rod, making the operation convenient.

[0036] Optionally, the sleeve 2 is a titanium alloy component. It is understood that both the constant section 23 and the deformation section 22 are made of titanium alloy, which can ensure the support strength of the sleeve 2. In addition, titanium alloy has good biocompatibility and its mechanical properties are close to those of human bone, which can improve the implantation effect of the growth rod.

[0037] In one example, such as Figure 4 and Figure 5 As shown, there are two constant segments 23, which are respectively arranged at both ends of the extension direction of the deformable segment 22. It can be understood that the two constant segments 23 are respectively arranged on the upper and lower sides of the deformable segment 22, and the deformable segment 22 is located in the middle of the sleeve 2. Thus, when the growth rod is stretched by the growth of the spine, the middle part of the sleeve 2 will be elongated to adapt to the normal growth of the spine. Furthermore, the constant segments 23 on the upper and lower sides of the sleeve 2 can ensure that the sleeve 2 has sufficient structural strength and a good support effect.

[0038] Optionally, there are multiple deformable segments 22, which are arranged at intervals along the extension direction of the sleeve 2. This makes the extension position of the sleeve 2 more uniform, which is beneficial to improving the orthopedic effect of the spine.

[0039] Another embodiment of the orthopedic fixation system of this utility model includes pedicle screws and the growth rod of this utility model. The sleeve 2 can be fixed to the vertebra by the pedicle screws.

[0040] According to the orthopedic fixation system of this utility model, since the inner core 1 is a memory metal component, the inner core 1 can be prefabricated in advance according to the patient's spinal deformity before surgery, thereby providing the patient's spine with a normal growth trajectory. The sleeve 2 is sleeved outside the inner core 1 to provide support for the spine. Since the deformable section 22 of the sleeve 2 can extend along the extension direction of the inner core 1 under the action of external force, the overall length of the sleeve 2 can be extended accordingly when the patient's spine grows. Therefore, the growth rod can be extended without open surgery, reducing the risk of complications caused by repeated open surgery, and the spinal correction effect is better.

[0041] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "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 are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 utility model.

[0042] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] In this utility model, unless otherwise explicitly 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.

[0045] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. 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.

[0046] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A growth rod, characterized in that, include: The inner core is a shape memory metal component; A sleeve with a channel inside, an inner core slidingly passing through the channel, and the sleeve including a deformation section that can extend along the extension direction of the inner core under the action of external force.

2. The growth rod according to claim 1, characterized in that, The deformable segment is spirally wound around the inner core along the extension direction of the inner core, and the deformable segment is elastic.

3. The growth rod according to claim 1, characterized in that, The deformable segment has multiple folds, which are arranged sequentially along the length of the inner core. Under the action of external force, the folds can extend along the extension direction of the inner core.

4. The growth rod according to claim 1, characterized in that, In its initial state, the inner core of the growth rod is longer than the sleeve, and the inner core protrudes from one end of the sleeve.

5. The growth rod according to claim 1, characterized in that, The sleeve also includes a constant section with a fixed length. Part of the channel is located within the constant section, and another part of the channel is located within the deformation section. The constant section is connected to the deformation section.

6. The growth rod according to claim 5, characterized in that, The constant segment and the deformable segment are integrally formed.

7. The growth rod according to claim 5, characterized in that, There are two constant segments, which are respectively arranged at both ends of the extension direction of the deformation segment.

8. The growth rod according to claim 1, characterized in that, The deformation segments are multiple, and the multiple deformation segments are arranged at intervals along the extension direction of the sleeve.

9. The growth rod according to claim 1, characterized in that, The sleeve is a titanium alloy component.

10. An orthopedic fixation system, characterized in that, The growth rod includes any one of claims 1-8.

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