Bone bar
By designing multiple first and second surface structures on the bone rod surface and combining absorbable and self-expanding materials, the problem of existing bone rods being unable to restrict the rotation of damaged bone is solved, achieving more stable bone fixation and promoting healing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2026-04-03
Smart Images
Figure CN224070556U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of medical device technology, and more particularly to a bone rod. Background Technology
[0002] Typically, bone rods are used to fix damaged bone and the main bone to promote bone tissue healing. The surface of a bone rod usually has multiple barbs arranged axially. When the bone rod is inserted into the damaged bone and the main bone through a bone tunnel, the multiple barbs located on both sides of the bone fracture surface can help the damaged bone and the main bone form a relatively tight connection. However, these barbs are insufficient to restrict the rotation of the damaged bone relative to the main bone around the central axis of the bone rod, posing a risk of rotation of the damaged bone relative to the main bone, which is detrimental to promoting the recovery of the damaged bone. 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 bone rod that can reduce the risk of damaged bone falling off the main bone and reduce the risk of damaged bone rotating relative to the main bone, thus facilitating the recovery of damaged bone.
[0004] This application provides the following technical solution:
[0005] In a first aspect, embodiments of this application provide a bone rod, the bone rod comprising:
[0006] A rod having a proximal end and a distal end; wherein the outer surface of the distal end has a plurality of first surface structures, and the proximal end has a plurality of second surface structures;
[0007] The first surface structure extends circumferentially along the rod, and the plurality of first surface structures are arranged sequentially along the axial direction of the rod.
[0008] The second surface structure extends along the axial direction of the rod, and the plurality of second surface structures are arranged at intervals along the circumferential direction of the rod.
[0009] In some embodiments, the plurality of first surface structures include one or more of the following;
[0010] Teeth, barbs, flanges, ribs;
[0011] The plurality of second surface structures includes one or more of the following:
[0012] Groove, ridge.
[0013] In some embodiments, the plurality of first surface structures have the same shape and size, and the plurality of second surface structures have the same shape and size.
[0014] In some embodiments, the first surface structure covers the second surface structure on the axial projection of the rod.
[0015] In some embodiments, a circular arc transition is used between adjacent first surface structures.
[0016] In some embodiments, along the axial direction of the rod, the length of the portion of the rod in which the plurality of first surface structures are disposed is L1, and the length of the portion of the rod in which the second surface structures are disposed is L2, and satisfies:
[0017] L1:L2 = 1:1;
[0018] Or, L1:L2 = 2:1;
[0019] Or L1:L2 = 1:2.
[0020] In some embodiments, the distal end is a pointed end and the proximal end is a planar end.
[0021] In some embodiments, the plurality of first surface structures are arranged at equal intervals along the axial direction of the rod, and the plurality of second surface structures are evenly distributed along the circumferential direction of the rod.
[0022] In some embodiments, the maximum diameter of the bone rod is D, and satisfies: 1mm≤D≤5mm;
[0023] The length of the rod is L, and it satisfies the following condition: 10mm≤L≤100mm.
[0024] In some embodiments, the rod is configured as a water-absorbing and swelling structure.
[0025] The embodiments of this application have the following advantages:
[0026] This application provides a bone rod with multiple first surface structures and multiple second surface structures that can engage bone tissue. After the bone rod is implanted into a bone tunnel, the paths extending from the multiple first surface structures can restrict the movement of the damaged bone relative to the main bone along the length of the rod, and the paths extending from the multiple second surface structures can restrict the rotation of the damaged bone relative to the main bone around the central axis of the rod. In this configuration, when the bone rod is used to fix the damaged bone and the main bone, the risk of the damaged bone dislodging from the main bone and the risk of the damaged bone rotating relative to the main bone can be reduced.
[0027] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0028] 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.
[0029] Figure 1 This is a schematic diagram illustrating the application scenario of the bone rod involved in this utility model example.
[0030] Figure 2 This is a first-view schematic diagram showing the bone rod involved in the example of this utility model.
[0031] Figure 3 This is a second-view schematic diagram showing the bone rod involved in the example of this utility model.
[0032] Figure 4 This is a schematic cross-sectional view of the first surface structure involved in this utility model example.
[0033] Figure 5 It shows Figure 3 An enlarged schematic diagram of region A in the middle.
[0034] Figure 6 This is a cross-sectional schematic diagram showing the second surface structure involved in this utility model example.
[0035] Figure 7 This is a schematic diagram showing that the plurality of first surface structures involved in this utility model are flush with the plurality of second surfaces.
[0036] Figure 8 This is a schematic diagram illustrating a first embodiment of a bone rod implantation bone tunnel according to an example of the present invention.
[0037] Figure 9 This is a schematic diagram illustrating a second embodiment of the bone rod implantation bone tunnel according to an example of the present invention.
[0038] Explanation of key component symbols:
[0039] 2-Bone tissue; 20-Main bone; 22-Damaged bone; 24-Bone tunnel;
[0040] 1-Bone rod; 10-Rod body; 10a-Proximal end; 10b-Distal end; 12-First surface structure; 14-Second surface structure. Detailed Implementation
[0041] 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.
[0042] It should be noted that when an element is said to be "fixed" to another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly" on another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.
[0043] 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.
[0044] 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.
[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the template description is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0046] In related technologies, in daily life, fractures or bone defects may occur due to sports injuries, accidents, diseases, etc. Orthopedic repair surgery can treat fractures or bone defects and help the damaged bone tissue 2 recover. In orthopedic repair surgery, implantation instruments such as bone rods 1, bone screws, and bone plates are often used to fix the damaged bone 22 and the main bone 20 to promote the healing of bone tissue 2.
[0047] Taking bone rod 1 as an example, the surface of bone rod 1 usually has multiple barbed structures arranged along the axial direction. When bone rod 1 is implanted into the bone of damaged bone 22 and main bone 20 through bone tunnel 24, the multiple barbed structures located on both sides of the bone cross section can make damaged bone 22 and main bone 20 form a relatively tight connection, preventing damaged bone 22 from falling off main bone 20, thereby enabling damaged bone 22 to be better fixed to main bone 20 to promote the recovery of damaged bone 22.
[0048] However, the aforementioned barbed structures are generally surface protrusions formed by extending circumferentially along the bone rod 1. Although multiple barbed structures can restrict the movement of the damaged bone 22 relative to the main bone 20 in the length direction of the bone rod 1 and reduce the risk of the damaged bone 22 falling off, these barbed structures often cannot restrict the damaged bone 22 from rotating around the central axis of the bone rod 1 relative to the main bone 20. In this case, due to the risk of the damaged bone 22 rotating relative to the main bone 20, it is not conducive to promoting the recovery of the damaged bone 22.
[0049] This utility model relates to a bone rod 1 that is resistant to detachment and rotation. The bone rod 1 can be used in orthopedic surgery to fix the bone to be connected (also known as damaged bone 22 or implanted bone) to the main bone 20, thereby promoting the healing of bone tissue 2.
[0050] In this invention, the damaged bone 22 and the main bone 20 are fixed by the bone rod 1, which prevents detachment and rotation. This reduces the risk of the damaged bone 22 falling off the main bone 20 and the risk of the damaged bone 22 rotating relative to the main bone 20, thereby improving the firmness of the connection between the damaged bone 22 and the main bone 20 and thus improving the healing effect of the bone tissue 2.
[0051] In addition, the bone rod 1 that is resistant to falling off and rotation is made of absorbable material. After the bone rod 1 is implanted into the bone tunnel 24, it can be absorbed by the bone tissue 2 without the need for a second surgery to remove it, thereby improving the convenience of using the bone rod 1.
[0052] In addition, the bone rod 1 that prevents detachment and rotation involved in this utility model is made of a self-expanding material. After the bone rod 1 is implanted into the bone tunnel 24, it can absorb water and expand, neutralizing the expansion effect of the bone tunnel 24. This can improve the firmness of the connection between the damaged bone 22 and the main bone 20 in the early stage of bone rod 1 implantation into the bone tunnel 24, which is conducive to promoting the healing of bone tissue 2.
[0053] Figure 1 This is a schematic diagram illustrating the application scenario of the bone rod 1 involved in this utility model example.
[0054] See in some examples Figure 1Bone tunnel 24 can be a bone hole formed by drilling a hole at the junction of the damaged bone 22 and the main bone 20 (i.e., the fracture site). In addition, the enlargement effect of bone tunnel 24 can refer to the phenomenon that after bone rod 1 is implanted into bone tunnel 24, due to the irritation response of human bone tissue 2, the diameter of bone tunnel 24 will increase to a certain extent in the early stage of bone rod 1 implantation.
[0055] Additionally, in this utility model, see Figure 1 The anti-dislodgement and anti-rotation bone rod 1 can be implanted into the damaged bone 22 and the main bone 20 through the bone tunnel 24, and is located on both sides of the bone cross-section. Furthermore, the bone cross-section can represent the contact surface between the damaged bone 22 and the main bone 20. In some examples, the anti-dislodgement and anti-rotation bone rod 1 can be implanted into the bone tunnel 24 by external force impact.
[0056] In some examples, the anti-detachment and anti-rotation bone rod 1 of this utility model can also be simply referred to as bone rod 1, and sometimes it can also be called bone joining rod, bone joining nail, or fracture fixation device, etc.
[0057] Figure 2 This is a first-view schematic diagram showing the bone rod 1 involved in the example of this utility model. Figure 3 This is a second-view schematic diagram showing the bone rod 1 involved in this utility model example. Figure 4 This is a cross-sectional schematic diagram showing the first surface structure 12 involved in this utility model example.
[0058] See in some examples Figure 2 or Figure 3 The bone rod 1 may include a rod body 10 and a first surface structure 12. The first surface structure 12 may be used to join bone tissue 2, and the rod body 10 may be used to support the first surface structure 12. In addition, the rod body 10 may also be used to guide the first surface structure 12 to the bone tunnel 24 so that the first surface structure 12 joins the bone tissue 2.
[0059] See in some examples Figure 2 or Figure 3 The rod 10 can be elongated, meaning it can be an elongated structure. In some examples, there can be multiple first surface structures 12, which can be arranged on the outer surface of the elongated rod 10. Figure 2 and Figure 3 One of the first surface structures 12 is schematically identified.
[0060] In some examples, multiple first surface structures 12 may be formed on the outer surface of the rod 10.
[0061] See in some examples Figure 4The first surface structure 12 can extend circumferentially along the circumferential direction D1 of the rod 10. In some examples, multiple first surface structures 12 can each extend circumferentially along the circumferential direction D1 of the rod 10 and be arranged along the axial direction D2 of the rod 10 (see [reference]). Figure 2 ).
[0062] In some examples, after the bone tube 24 is implanted into the bone rod 1, a plurality of first surface structures 12 can engage the damaged bone 22 and the main bone 20. The paths extending from the plurality of first surface structures 12 can restrict the movement of the damaged bone 22 relative to the main bone 20 in the length direction of the rod 10, thereby reducing the risk of the damaged bone 22 dislodging from the main bone 20.
[0063] In some examples, at least one first surface structure 12 may use a variety of surface structures. For example, at least one first surface structure 12 may have a variety of constructions, shapes, and sizes.
[0064] In some examples, at least one first surface structure 12 may use any one of the following surface structures: teeth, barbs, flanges, or ribs. Figure 2 and Figure 3 The first surface structure 12 is schematically shown as barbs. In this case, by increasing the frictional force between the bone rod 1 and the bone tissue 2 along the length of the rod body 10, the possibility of the bone rod 1 moving within the bone tunnel 24 can be suppressed, thereby limiting the movement of the damaged bone 22 relative to the main bone 20 along the length of the rod body 10. In addition, it is easier for the bone rod 1 to be pushed into the bone tunnel 24 under the action of external force, and compared with rotating the bone rod 1 to screw it into the bone tunnel 24, damage to the bone tissue 2 can be reduced.
[0065] In some examples, at least one first surface structure 12 can be a tooth, such as a rack, serration, or ratchet. In some examples, at least one first surface structure 12 can be a barb. In some examples, at least one first surface structure 12 can be a flange. In some examples, at least one first surface structure 12 can be a rib, such as a rib bar.
[0066] In some examples, multiple first surface structures 12 can simultaneously use various surface structures such as teeth, barbs, flanges, and ribs. Specifically, among the multiple first surface structures 12, some first surface structures 12 can be teeth, some first surface structures 12 can be barbs, some first surface structures 12 can be flanges, and the remaining first surface structures 12 can be ribs.
[0067] In some examples, multiple first surface structures 12 can be identical. That is, multiple first surface structures 12 can have the same shape and size. In this case, the overall consistency of the bone rod 1 can be improved, so that the bone rod 1 can be more easily implanted into the bone tunnel 24, while reducing the processing difficulty of the bone rod 1. For example, multiple first surface structures 12 can all be barbs, or multiple first surface structures 12 can all be flanges, or multiple first surface structures 12 can all be ribs.
[0068] Figure 5 yes Figure 3 An enlarged schematic diagram of region A in the middle.
[0069] See in some examples Figure 5 Adjacent first surface structures 12 may have a first interval S1. In some examples, multiple first surface structures 12 may be arranged along the axial direction D2 of the rod 10 with adjacent first surface structures 12 having a first interval S1. That is, multiple first surface structures 12 may be distributed at intervals along the axial direction D2 of the rod 10.
[0070] See in some examples Figure 5 The adjacent first surface structures 12 are transitioned by a rounded arc. In this case, the risk of fracture of the bone rod 1 can be reduced by suppressing excessive stress concentration between adjacent first surface structures 12.
[0071] See in some examples Figure 3 Multiple first surface structures 12 can be uniformly arranged along the axial direction D2 of the rod 10. That is, among the multiple first surface structures 12 arranged along the axial direction D2 of the rod 10, the first interval S1 of adjacent first surface structures 12 can be equal. In this case, when the bone rod 1 is implanted into the bone tunnel 24, it is beneficial to balance the force on the multiple first surface structures 12.
[0072] In some examples, multiple first surface structures 12 may be identical, and the same multiple first surface structures 12 may be uniformly arranged on the rod 10 along the axial direction D2.
[0073] Figure 6 This is a cross-sectional schematic diagram showing the second surface structure 14 involved in this utility model example. Figure 7 This is a schematic diagram showing that the plurality of first surface structures 12 involved in this utility model are flush with the plurality of second surfaces.
[0074] See in some examples Figure 2 or Figure 3The bone rod 1 may include a second surface structure 14. The second surface structure 14 can be used to engage bone tissue 2, and the rod body 10 can be used to support the second surface structure 14. In addition, the rod body 10 can also be used to guide the second surface structure 14 to the bone tunnel 24 so that the second surface structure 14 engages bone tissue 2.
[0075] In some examples, there can be multiple second surface structures 14, and these multiple second surface structures 14 can be arranged on the outer surface of the elongated rod 10. Figure 2 and Figure 3 One of the second surface structures 14 is schematically identified.
[0076] In some examples, multiple second surface structures 14 may be formed on the outer surface of the rod 10.
[0077] In some examples, the second surface structure 14 may extend along the axial direction D2 of the rod 10. See also [other examples]. Figure 2 Multiple second surface structures 14 can extend along the axial direction D2 of the rod 10 and be arranged along the circumferential direction D1 of the rod 10.
[0078] In some examples, after the bone tube 24 is implanted into the bone rod 1, a plurality of second surface structures 14 can engage the damaged bone 22 and the main bone 20. The paths extending from the plurality of second surface structures 14 can restrict the rotation of the damaged bone 22 about the central axis of the rod 10 relative to the main bone 20, thereby reducing the risk of the damaged bone 22 rotating relative to the main bone 20.
[0079] In some examples, at least one second surface structure 14 may use a variety of surface structures. For example, at least one second surface structure 14 may have a variety of constructions, shapes, and sizes.
[0080] In some examples, at least one second surface structure 14 may use either a groove or a ridge surface structure. Figure 2 and Figure 3 The second surface structure 14 is schematically shown as a groove. In this case, it is beneficial to increase the friction between the bone rod 1 and the bone tissue 2 in the circumferential direction of the rod body 10, suppress the possibility of the bone rod 1 rotating in the bone tunnel 24, and thus better limit the rotation of the damaged bone 22 relative to the main bone 20 about the central axis of the rod body 10.
[0081] In some examples, at least one second surface structure 14 can be a groove. In some examples, at least one second surface structure 14 can be an edge. Additionally, in some examples, at least one second surface structure 14 can be a protrusion.
[0082] In some examples, multiple second surface structures 14 can simultaneously use various surface structures such as grooves, ridges, and protrusions. Specifically, among the multiple second surface structures 14, some second surface structures 14 can be grooves, some second surface structures 14 can be ridges, and the remaining second surface structures 14 can be protrusions.
[0083] In some examples, multiple second surface structures 14 can be identical, meaning that multiple second surface structures 14 can have the same shape and size. In this case, the overall consistency of the bone rod 1 can be better, making it easier for the bone rod 1 to be implanted into the bone tunnel 24; at the same time, it can reduce the processing difficulty of the bone rod 1. For example, multiple second surface structures 14 can all be grooves, or multiple second surface structures 14 can all be ridges, or multiple second surface structures 14 can all be protrusions.
[0084] See in some examples Figure 3 The adjacent second surface structures 14 have a second spacing S2. See some examples. Figure 6 Multiple second surface structures 14 can be arranged along the circumferential direction D1 of the rod 10 with adjacent second surface structures 14 having a second interval S2. That is, multiple second surface structures 14 can be distributed at intervals along the circumferential direction D1 of the rod 10.
[0085] See in some examples Figure 6 Multiple second surface structures 14 can be uniformly arranged along the circumferential direction D1 of the rod 10. That is, among the multiple second surface structures 14 arranged along the circumferential direction D1 of the rod 10, the second interval S2 of adjacent second surface structures 14 can be equal. In this case, when the bone rod 1 is implanted into the bone tunnel 24, it is beneficial to balance the force on the multiple second surface structures 14.
[0086] In some examples, multiple second surface structures 14 may be identical, and multiple identical second surface structures 14 may be uniformly arranged on the rod 10 along the circumferential direction D1.
[0087] See in some examples Figure 2 or Figure 3 The rod 10 may have a proximal end 10a and a distal end 10b. Furthermore, regarding the overall structure of the rod 1, the determination of the proximal end 10a and the distal end 10b may be based on the distance of the rod 1 from the surgeon performing the operation. For example, the portion of the rod 1 closer to the surgeon may be the proximal end 10a of the rod 10, and the portion farther from the surgeon may be the distal end 10b of the rod 10.
[0088] See in some examples Figure 2 or Figure 3The distal end of the bone rod 1 near the distal end 10b can be pointed, and the proximal end of the bone rod 1 near the proximal end 10a can be flat. In this case, it is easier to apply external force to the flat end to implant the bone rod 1 into the bone tunnel 24; in addition, since the distal end 10b is pointed, when external force is applied to the flat end, the bone rod 1 can be implanted into the bone tunnel 24 more smoothly. In some examples, the distal end of the bone rod 1 near the distal end 10b can be tapered. For example, see... Figure 3 The end of the bone rod 1 near the distal end 10b can gradually taper away from the second surface structure 14.
[0089] See in some examples Figure 2 or Figure 3 Multiple first surface structures 12 may be located near the distal end 10b of the rod 10. In some examples, multiple first surface structures 12 may be formed at the distal end 10b of the rod 10.
[0090] See in some examples Figure 2 or Figure 3 Multiple second surface structures 14 may be located near the proximal end 10a of the rod 10. In some examples, multiple second surface structures 14 may be formed at the proximal end 10a of the rod 10.
[0091] In some examples, the first surface structure 12 and the second surface structure 14 arranged on the rod 10 can be in contact (see...). Figure 3 Additionally, in some examples, the first surface structure 12 and the second surface structure 14 arranged on the rod body 10 may also be spaced apart.
[0092] See in some examples Figure 3 Along the axial direction D2 of the rod 10, the total length of the plurality of first surface structures 12 (also referred to as the first length L1) and the length of the extended second surface structure 14 (also referred to as the second length L2) can be the same or different. In some examples, the ratio of the total length of the plurality of first surface structures 12 to the length of the extended second surface structure 14 along the axial direction D2 of the rod 10 can be 1:1, 2:1, or 1:2. In this case, the ratio of the plurality of first lengths L1 and second lengths L2 can be easily adjusted to meet the requirements, depending on whether the focus is on preventing detachment or preventing rotation.
[0093] In some examples, when the fixation of the damaged bone 22 and the main bone 20 focuses on preventing dislodgement, the first length L1 can be greater than the second length L2. For example, the ratio of the first length L1 to the second length L2 can be 2:1. Conversely, when the fixation of the damaged bone 22 and the main bone 20 focuses on preventing rotation, the first length L1 can be less than the second length L2. For example, the ratio of the first length L1 to the second length L2 can be 1:2.
[0094] In some examples, the first surface structure 12 can cover the second surface structure 14 when projected along the direction from the distal end 10b of the rod 10 toward the proximal end 10a. In this case, the ability of the multiple first surface structures 12 to restrict the movement of the damaged bone 22 relative to the main bone 20 can be enhanced, further reducing the risk of the damaged bone 22 detaching from the main bone 20. Specifically, see Figure 3 Multiple first surface structures 12 may protrude from multiple second surface structures 14 along the circumferential direction D1 of the rod body 10. In other words, along the circumferential direction D1 of the rod body 10, multiple second surface structures 14 may be lower than multiple first surface structures 12.
[0095] Additionally, in some examples, see Figure 7 The multiple first surface structures 12 can also be flush with the multiple second surface structures 14 along the circumferential direction D1 of the rod body 10. For example, when the multiple second surface structures 14 are all edges, the edges can be flush with the multiple first surface structures 12.
[0096] Figure 8 This is a schematic diagram illustrating a first embodiment of the bone rod 1 implanted into the bone tunnel 24 according to an example of the present invention. Figure 9 This is a schematic diagram illustrating a second embodiment of the bone rod 1 implanted into the bone tunnel 24 according to an example of the present invention.
[0097] In some examples, multiple first surface structures 12 may be located on either side of the bone cross-section after the bone rod 1 is implanted into the bone tunnel 24. See, for example, [link to relevant documentation]. Figure 8 After the bone rod 1 is implanted into the bone tunnel 24, multiple second surface structures 14 can be located in the damaged bone 22, and multiple first surface structures 12 can pass through the bone cross section and simultaneously connect the damaged bone 22 and the main bone 20 (that is, a part of the first surface structures 12 is located in the damaged bone 22 and another part is located in the main bone 20).
[0098] Additionally, in some examples, multiple second surface structures 14 may be located on either side of the bone cross-section after the bone rod 1 is implanted into the bone tunnel 24. See, for example, [link to relevant documentation]. Figure 9 After the bone rod 1 is implanted into the bone tunnel 24, multiple first surface structures 12 can be located in the main bone 20, and multiple second surface structures 14 can pass through the bone cross section to simultaneously connect the damaged bone 22 and the main bone 20.
[0099] As described above, the bone rod 1 of this invention is made of absorbable material. In some examples, the bone rod 1 may be made of absorbable polymer material. Additionally, the polymer material may include absorbable polymer materials and inorganic particles.
[0100] In some examples, the absorbable polymer material may be selected from polylactic acid, polycaprolactone, polydioxanone, and polyglycolic acid. In some examples, the absorbable polymer material may also be selected from binary or higher random copolymers or block copolymers of lactide, caprolactone, dioxanone, and glycolide. In this case, by using an absorbable polymer material to prepare the bone rod 1, the bone rod 1 can be absorbed by the bone tissue 2 during the healing process without the need for secondary surgery to remove it; in addition, compared with bone rods 1 prepared using non-absorbable materials such as titanium rods or titanium alloys, it can reduce many inconveniences caused by the bone rod 1 remaining in the body, such as the inability to perform MRI examinations or the possible occurrence of inflammation such as synovitis.
[0101] In some examples, the inorganic particles may be selected from hydroxyapatite, tricalcium phosphate, calcium phosphate, and silicates. In this case, the inorganic particles can inhibit the occurrence of aseptic inflammation by neutralizing the acidic substances formed by the degradation of the absorbable polymer material.
[0102] Furthermore, as described above, the bone rod 1 of this invention is made of a self-expanding material. In some examples, the self-expanding material can be obtained from the aforementioned polymer material through forging (e.g., polymer forging process). Additionally, polymer forging is a processing method for processing polymer materials (e.g., absorbable polymers), which can alter the shape and structure of the polymer material by applying pressure and temperature, thereby changing the microstructure of the polymer material.
[0103] In some examples, the absorbable polymer material can achieve a more uniform and reinforced microstructure after forging, thereby enhancing the overall strength and toughness of the polymer material. In this case, when the forged polymer material is used to prepare the bone rod 1, the mechanical strength and durability of the bone rod 1 can be improved.
[0104] In some examples, the polymer material used to prepare the bone rod 1 can be obtained by injection molding followed by forging. In some examples, the microstructure of the polymer material can be altered by forging, giving the forged polymer material a self-expanding property. Specifically, the disordered polymer molecules in the polymer material can be transformed into oriented polymer molecules after forging, thereby enabling the forged polymer material to absorb water and swell. In this case, when the forged polymer material is used to prepare the bone rod 1, the bone rod 1 can possess the property of absorbing water and swelling.
[0105] Taking polylactic acid (PLA) as an example, the disordered polymers in PLA can be transformed into ordered and oriented polymers after forging. After the bone rod 1 is implanted into the bone tunnel 24, the forged PLA can absorb water and undergo hydrolysis to release internal stress, thereby causing the PLA to expand on its own.
[0106] In some examples, the bone rod 1 can be prepared by injection molding followed by forging. That is, the bone rod 1 can be prepared by first injection molding the polymer material used to prepare the bone rod 1 and then forging it. In some examples, the forged polymer material can be processed using computer numerical control (CNC) machining technology to prepare the bone rod 1.
[0107] In some examples, the coefficient of thermal expansion of bone rod 1 can be between 8% and 12%. For example, the coefficient of thermal expansion of bone rod 1 can be 8%, 9%, 10%, 11%, or 12%.
[0108] In some examples, preferably, the expansion coefficient of the bone rod 1 can be 10%. The expansion process of the bone rod 1 will be described below with the expansion coefficient of the bone rod 1 being 10% as an example.
[0109] For example, during orthopedic repair surgery, the diameter of the bone rod 1 implanted in the bone tunnel 24 is 5 mm. After a predetermined time (e.g., one month), due to the expansion of the polymer material by absorbing water, the diameter of the bone rod 1 can become 5.5 mm. Since the bone tunnel 24 is a bone hole artificially formed by drilling into the bone, it is considered trauma. When the bone rod 1 is filled into the bone tunnel 24, the bone tissue 2 will produce an irritation reaction. The diameter of the bone tunnel 24 will expand to a certain extent in the early stage of bone rod 1 implantation. The expansion of the bone tunnel 24 may cause the bone rod 1 to loosen, increasing the risk of the damaged bone 22 falling off the main bone 20. This situation is very unfavorable for the early fixation of the damaged bone 22 and the main bone 20, especially for older patients. In this invention, since the bone rod 1 is made of a self-expanding material, it can absorb water and expand after being implanted in the bone tunnel 24, neutralizing the expansion effect of the bone tunnel 24. This can improve the firmness of the connection between the damaged bone 22 and the main bone 20 in the early stage of bone rod 1 implantation in the bone tunnel 24, which is conducive to promoting the healing of bone tissue 2.
[0110] In some examples, the maximum diameter D of the bone rod 1 can be from 1 mm to 5 mm. This allows for the selection of a suitable diameter bone rod 1 for implantation based on the aperture of the bone tunnel 24. For example, the maximum diameter of the bone rod 1 can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, or 5 mm, etc.
[0111] In some examples, the length L of the bone rod 1 is 10 mm to 100 mm. This allows for the selection of a suitable length of bone rod 1 for implantation based on the length of the bone tunnel 24. For example, the length of the bone rod 1 can be 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, or 100 mm, etc.
[0112] In this invention, multiple first surface structures 12 and multiple second surface structures 14 can connect to bone tissue 2. After the bone rod 1 is implanted into the bone tunnel 24, the paths extending from the multiple first surface structures 12 can restrict the movement of the damaged bone 22 relative to the main bone 20 in the length direction of the rod 10, and the paths extending from the multiple second surface structures 14 can restrict the rotation of the damaged bone 22 relative to the main bone 20 around the central axis of the rod 10. In this case, when the bone rod 1 is used to fix the damaged bone 22 and the main bone 20, the risk of the damaged bone 22 falling off the main bone 20 and the risk of the damaged bone 22 rotating relative to the main bone 20 can be reduced, thereby improving the firmness of the connection between the damaged bone 22 and the main bone 20, and thus improving the healing effect of the bone tissue 2.
[0113] In all examples shown and described herein, any specific values should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.
[0114] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0115] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.
Claims
1. A bone rod, characterized in that, The bone rod comprises: a rod body having a proximal end and a distal end; wherein an outer surface of the distal end has a plurality of first surface structures, and the proximal end has a plurality of second surface structures; the first surface structures are arranged along a circumferential direction of the rod body, and the plurality of first surface structures are arranged along an axial direction of the rod body in sequence; the second surface structures are arranged along an axial direction of the rod body, and the plurality of second surface structures are arranged along a circumferential direction of the rod body at intervals.
2. The bone rod of claim 1 wherein, The plurality of first surface structures comprises one or more of: teeth, barbs, flanges, ribs; The plurality of second surface structures comprises one or more of: grooves, ridges.
3. The bone rod of claim 1 wherein, The plurality of first surface structures are identical in shape and size, and the plurality of second surface structures are identical in shape and size.
4. The bone rod of claim 1 wherein, In an axial projection of the rod body, the first surface structures cover the second surface structures.
5. The bone rod of claim 1 wherein, Adjacent first surface structures are connected by a circular arc.
6. The bone rod of claim 1 wherein, In the axial direction of the rod body, the length of the part of the rod body provided with the plurality of first surface structures is L1, the length of the part of the rod body provided with the second surface structures is L2, and the following conditions are met: L1:L2=1:1; Or, L1:L2=2:1; Or L1:L2=1:
2.
7. The bone rod according to claim 1, wherein The end of the distal end is a pointed end, and the end of the proximal end is a flat end.
8. The bone rod according to claim 1, wherein The plurality of first surface structures are arranged at equal intervals along the axial direction of the rod body, and the plurality of second surface structures are uniformly distributed along the circumferential direction of the rod body.
9. The bone rod according to claim 1, wherein The maximum diameter of the bone rod is D, and the following condition is met: 1mm≤D≤5mm; The length of the bone rod is L, and the following condition is met: 10mm≤L≤100mm.
10. The bone rod according to claim 1, wherein The rod body is provided as a water-absorbing and swelling structure.