Bone defect transplantation stent

Abstract

The utility model belongs to the technical field of medical instruments, and particularly discloses a bone defect transplantation support. The bone defect transplantation stent comprises an outer tube body and an inner supporting piece, and the outer tube body extends from one end to the other end; the inner supporting piece is arranged in the outer pipe body and comprises an inner pipe body and a first supporting plate, the extending direction of the inner pipe body is consistent with that of the outer pipe body, an annular containing cavity is formed between the outer wall of the inner pipe body and the inner wall of the outer pipe body, and the first supporting plate is arranged in the containing cavity and connected with the inner pipe body. An included angle is formed between the extending direction of the first supporting plate and the extending direction of the inner pipe body. According to the utility model, the graft can be reliably fixed, and the filling amount of the graft is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a bone defect transplantation stent. Background Technology

[0002] When treating large-segment bone defects with bone grafting, the graft needs to be placed at the defect site and fixed. However, if the graft is not securely fixed, it can easily sink. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention provide a bone defect transplant scaffold that can reliably fix the graft and reduce the amount of graft filling required.

[0004] The bone defect transplantation scaffold of this utility model includes an outer tube and an inner support member. The outer tube extends from one end to the other. The inner support member is disposed within the outer tube and includes an inner tube and a first support plate. The inner tube and the outer tube extend in the same direction, and an annular receiving cavity is formed between the outer wall of the inner tube and the inner wall of the outer tube. The first support plate is disposed within the receiving cavity and connected to the inner tube. The extension direction of the first support plate is arranged at an angle to the extension direction of the inner tube.

[0005] The bone defect graft scaffold in this embodiment includes an outer tube and an inner support. The outer tube provides mechanical support, while the inner support, comprising an inner tube and a first support plate, is disposed within the outer tube. An annular cavity is formed between the inner and outer tubes, allowing the graft to be filled within the cavity and encased between the inner and outer walls of the outer and inner tubes. The first support plate within the cavity enhances graft fixation, ensuring reliable fixation, promoting bone integration, and shortening healing time. Furthermore, the tubular structure of the inner tube reduces the amount of graft filling required, and its internal channel allows for the insertion of intramedullary nails or other fixation devices to secure the scaffold, facilitating fixation.

[0006] In this embodiment, multiple first support plates are provided, and the multiple first support plates are distributed at intervals along the extension direction of the inner tube.

[0007] In this embodiment, the inner support member further includes a second support plate, which is connected to the inner tube and the outer tube respectively. The extension direction of the second support plate is consistent with that of the inner tube, and the second support plate is arranged intersecting with the first support plate.

[0008] In this embodiment, the inner wall of the outer tube is provided with a insertion groove corresponding to the position of the second support plate, and the second support plate is inserted into the insertion groove.

[0009] In this embodiment, in the extending direction of the outer tube, one end of the insertion groove is open and the other end is closed.

[0010] In this embodiment, the first support plate and the inner tube are integrally formed;

[0011] And / or, the second support plate is integrally formed with the inner tube body.

[0012] In this embodiment, the first support plate is provided with a plurality of spaced-apart first through holes;

[0013] And / or, the second support plate is provided with a plurality of spaced-apart second through holes;

[0014] In this embodiment, the outer tube body is provided with a plurality of spaced-apart third through holes.

[0015] In this embodiment, the inner tube is provided with an opening that connects the accommodating cavity and the internal channel of the inner tube.

[0016] In this embodiment, the inner tube is made of polylactic acid. In the extending direction of the inner tube, a slit is provided on the side wall of the inner support to allow the inner tube to be unfolded through the slit.

[0017] In this embodiment, the outer tube is provided with a weight-reducing groove; and / or, the outer tube is made of titanium alloy. Attached Figure Description

[0018] Figure 1 This is a perspective view of a bone defect transplantation scaffold according to an embodiment of the present invention.

[0019] Figure 2 This is a cross-sectional view of a bone defect transplantation scaffold according to an embodiment of the present invention.

[0020] Figure 3 This is a perspective view of the inner support member according to an embodiment of the present utility model.

[0021] Figure 4 This is a perspective view of the outer tube body of an embodiment of this utility model.

[0022] Figure label:

[0023] 1. Outer tube body; 11. Insertion groove; 12. Third through hole; 13. Protrusion; 14. Weight reduction groove;

[0024] 2. Inner support component; 21. Inner tube body; 211. Opening; 212. Inner channel; 22. First support plate; 221. First through hole; 23. Second support plate; 231. Second through hole;

[0025] 3. Receptacle. 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] In this embodiment, as Figures 1 to 3 As shown, the bone defect transplantation scaffold includes an outer tube 1 and an inner support 2. The outer tube 1 extends from one end to the other. The inner support 2 is disposed inside the outer tube 1 and includes an inner tube 21 and a first support plate 22. The inner tube 21 and the outer tube 1 extend in the same direction, and an annular cavity 3 is formed between the outer wall of the inner tube 21 and the inner wall of the outer tube 1. The first support plate 22 is disposed inside the cavity 3 and connected to the inner tube 21. The extension direction of the first support plate 22 is arranged at an angle to the extension direction of the inner tube 21.

[0028] For example, the outer tube 1 can be made of titanium alloy, and the inner support 2 can be made of polylactic acid (PLA). Titanium alloy has good biocompatibility and provides mechanical support, but its excessive stiffness can easily lead to stress shielding. The ester bonds in the main chain of PLA are easily hydrolyzed and decomposed to form harmless and non-toxic monomers, and it has good biocompatibility and mechanical properties, which can promote bone healing, but its early stability is poor. By setting the outer tube 1 to be made of titanium alloy and the inner support 2 to be made of PLA, the combined effect of the two can enable the scaffold to bear weight early, ensure early stability, and avoid stress shielding, which is conducive to promoting bone healing.

[0029] like Figure 3 As shown, the first support plate 22 can be perpendicular to the extension direction of the inner tube 21, which can provide uniform support force to the graft and help the first support plate 22 stably support the graft. The included angle between the first support plate 22 and the inner tube 21 can be set according to actual needs and is not limited here.

[0030] Specifically, in this embodiment, the outer tube 1 and the inner support 2 can be formed by 3D printing. Before forming the outer tube 1, a CT scan of the affected side can be obtained to model the defect area, obtain the actual cortical surface of the bone, and then establish the outer tube 1.

[0031] The bone defect graft scaffold in this embodiment includes an outer tube 1 and an inner support 2. The outer tube 1 provides mechanical support, while the inner support 2 is disposed inside the outer tube 1. The inner support 2 includes an inner tube 21 and a first support plate 22. An annular receiving cavity 3 is formed between the inner tube 21 and the outer tube 1, allowing the graft to be filled into the receiving cavity 3, so that the graft is wrapped between the inner wall of the outer tube 1 and the outer wall of the inner tube 21. At the same time, the first support plate 22 in the receiving cavity 3 can enhance the fixation effect on the graft, making the graft reliably fixed, which is conducive to enhancing bone integration and shortening the healing time. In addition, the inner tube 21 is a tubular structure, which can reduce the amount of graft filling, and the inner channel 212 of the inner tube 21 can be used to fix the scaffold with fixation devices such as intramedullary nails, thereby facilitating the fixation of the scaffold.

[0032] In this embodiment, multiple first support plates 22 are provided, and the multiple first support plates 22 are distributed at intervals along the extension direction of the inner tube 21.

[0033] Specifically, the spacing between two adjacent first support plates 22 and the number of first support plates 22 can be set according to actual needs and are not limited here.

[0034] It is understood that by setting multiple first support plates 22 in this embodiment, the graft can be provided with uniform and stable support.

[0035] In this embodiment, as Figure 3 As shown, the first support plate 22 is provided with a plurality of spaced first through holes 221.

[0036] It is understandable that by providing a first through hole 221 on the first support plate 22, the two sides of the first support plate 22 can be connected to each other through the first through hole 221, which is conducive to cell attachment and growth, and thus promotes bone healing.

[0037] In this embodiment, the first support plate 22 and the inner tube 21 are integrally formed.

[0038] For example, the first support plate 22 and the inner tube 21 can be integrally formed by 3D printing. Of course, the first support plate 22 and the inner tube 21 can also be integrally formed by other forming methods, which are not limited here.

[0039] It is understandable that the first support plate 22 and the inner tube 21 are integrally formed, which helps to improve the stability of the connection between the first support plate 22 and the inner tube 21. Furthermore, the first support plate 22 and the inner tube 21 do not need to be connected by connecting parts, which helps to simplify the overall structure.

[0040] In this embodiment, as Figures 1 to 3As shown, the inner support member 2 also includes a second support plate 23, which is connected to the inner tube 21 and the outer tube 1 respectively. The extension direction of the second support plate 23 is consistent with that of the inner tube 21, and the second support plate 23 is arranged to cross the first support plate 22.

[0041] Specifically, multiple second support plates 23 are provided, and these plates are evenly spaced between the inner tube 21 and the outer tube 1, which helps to improve the stability of the overall structure. For example, there can be two, three, or four second support plates 23. The specific number of second support plates 23 can be set according to actual needs and is not limited here.

[0042] For example, the first support plate 22 is annular, and a gap is formed between the outer edge of the first support plate 22 and the inner wall of the outer tube 1, which makes it easy to fill the grafts between multiple first support plates 22 in sequence through the gap.

[0043] Understandably, the second support plate 23 is connected to both the inner tube 21 and the outer tube 1. The second support plate 23 allows the outer tube 1 to be stably supported outside the inner tube 21, creating a cavity 3 for the implant between the inner and outer tubes. Furthermore, the cross arrangement of the first support plate 22 and the second support plate 23 further enhances the overall stability.

[0044] In this embodiment, the second support plate 23 is integrally formed with the inner tube 21.

[0045] For example, the second support plate 23 and the inner tube 21 can be integrally formed by 3D printing. Of course, the second support plate 23 and the inner tube 21 can also be integrally formed by other forming methods, which are not limited here.

[0046] It is understandable that the second support plate 23 is integrally formed with the inner tube 21, which helps to improve the stability of the connection between the second support plate 23 and the inner tube 21. Furthermore, the second support plate 23 and the inner tube 21 do not need to be connected by connecting parts, which helps to simplify the overall structure.

[0047] In this embodiment, as Figure 3 As shown, the second support plate 23 is provided with a plurality of spaced second through holes 231.

[0048] It is understandable that by providing a first through hole 221 on the second support plate 23, the two sides of the second support plate 23 can be interconnected through the second through hole 231, which is conducive to cell attachment and growth, and thus promotes bone healing.

[0049] In this embodiment, as Figure 2 and Figure 4As shown, the inner wall of the outer tube 1 is provided with a insertion groove 11 corresponding to the position of the second support plate 23, and the second support plate 23 is inserted into the insertion groove 11.

[0050] Specifically, when the inner support member 2 is installed inside the outer tube 1, the position of the second support plate 23 corresponds to the position of the insertion slot 11, and the inner support member 2 is pushed in from one end of the outer tube 1. The number of insertion slots 11 is the same as the number of second support plates 23, and each second support plate 23 is inserted into one insertion slot 11.

[0051] It is understandable that by setting a insertion groove 11 inside the outer tube 1, the second support plate 23 is inserted into the insertion groove 11. The circumferential rotation of the inner support member 2 can be restricted by the cooperation of the insertion groove 11 and the second support plate 23. This helps to stably fix the inner support member 2 inside the outer tube 1, thereby avoiding the displacement of the graft due to the rotation of the inner support member 2 relative to the outer tube 1.

[0052] In this embodiment, one end of the insertion groove 11 is open and the other end is closed in the extending direction of the outer tube 1.

[0053] For example, a protrusion 13 can be provided at the closed end of the insertion groove 11 to improve the sealing effect of the closed end on the inner support member 2 and to reduce the depth of the insertion groove 11.

[0054] When installing the inner support 2, the second support plate 23 is aligned with one open end of the insertion groove 11 of the outer tube 1, and the inner support 2 is installed inside the outer tube 1 by moving the second support plate 23 along the insertion groove 11. When the second support plate 23 abuts against the inner wall of the closed end of the insertion groove 11, it is determined that the inner support 2 is installed in place. This facilitates the accurate installation of the inner support 2 and quickly confirms whether the inner support 2 is installed in place.

[0055] In this embodiment, as Figure 4 As shown, the outer tube 1 is provided with multiple spaced third through holes 12.

[0056] It is understandable that by setting a third through hole 12 on the outer tube 1, the inside and outside of the outer tube 1 are connected, which is conducive to the attachment and growth of living tissue cells through the third through hole 12, thereby promoting bone healing.

[0057] In this embodiment, as Figure 2 and Figure 3 As shown, the inner tube 21 is provided with an opening 211 that connects the accommodating cavity 3 and the inner channel 212 of the inner tube 21.

[0058] For example, each opening 211 corresponds to the space formed between two adjacent first support plates 22 and two adjacent second support plates 23, so that the inner tube 21 is connected to the first support plate 22 and the second support plate 23 at the position where the opening 211 is not provided, which helps to improve the reliability of the connection between the inner tube 21 and the first support plate 22 and the second support plate 23.

[0059] It is understandable that by setting an opening 211 on the inner tube 21 to connect the accommodating cavity 3 and the inner tube 21, nutrients can permeate out from the intramedullary channel, providing necessary nutrition for newly generated bone cells. At the same time, it facilitates the timely removal of waste products generated by bone cell metabolism, which is beneficial to promoting bone healing.

[0060] In this embodiment, the inner tube 21 is made of polylactic acid. In the extending direction of the inner tube 21, a gap (not shown in the figure) is provided on the side wall of the inner support 2 to allow the inner tube 21 to be unfolded through the gap.

[0061] For example, the gap can be a straight line, a curve, or a broken line. The gap can penetrate the first support plate 22 and the inner tube 21 or the second support plate 23 and the inner tube 21. The specific shape and location of the gap can be set according to actual needs and are not limited here.

[0062] Understandably, by using polylactic acid for the inner tube 21, it not only possesses good biocompatibility but also good tensile strength and ductility, facilitating processing and stretching. By creating gaps in the inner support 2 to unfold the inner tube 21, it is easy to fit the unfolded inner tube 21 onto fixation devices such as intramedullary nails, thereby facilitating the fixation of the stent.

[0063] In this embodiment, as Figure 4 As shown, a weight-reducing groove 14 is provided on the outer tube 1. And / or the material of the outer tube 1 is titanium alloy.

[0064] For example, the weight-reducing groove 14 can be a strip-shaped groove extending along the extension direction of the outer tube 1. The shape and number of the weight-reducing groove 14 can be set according to actual needs and are not limited here.

[0065] Understandably, by setting the weight-reducing groove 14 on the outer tube 1, the weight of the outer tube 1 can be reduced. Titanium alloy is relatively lightweight, and its weight can be reduced for the same volume. Setting the weight-reducing groove 14 on the outer tube 1 and making the outer tube 1 of titanium alloy can further reduce its weight. Therefore, whether the weight-reducing groove 14 is set on the outer tube 1, the outer tube 1 is made of titanium alloy, or both are combined, the weight of the outer tube 1 can be reduced. This reduces the pressure of the outer tube 1 on surrounding tissues, decreases the feeling of a foreign body, reduces patient discomfort and pain, and facilitates surgical procedures.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A bone defect transplant scaffold, characterized in that, include: An outer tube body that extends from one end to the other; An inner support member is disposed within the outer tube. The inner support member includes an inner tube and a first support plate. The inner tube and the outer tube extend in the same direction, and an annular accommodating cavity is formed between the outer wall of the inner tube and the inner wall of the outer tube. The first support plate is disposed within the accommodating cavity and connected to the inner tube. The extension direction of the first support plate is arranged at an angle to the extension direction of the inner tube.

2. The bone defect transplant scaffold according to claim 1, characterized in that, Multiple first support plates are provided, and the multiple first support plates are distributed at intervals along the extension direction of the inner tube.

3. The bone defect transplant scaffold according to claim 1, characterized in that, The inner support also includes a second support plate, which is connected to the inner tube and the outer tube respectively. The extension direction of the second support plate is consistent with that of the inner tube, and the second support plate is arranged to cross the first support plate.

4. The bone defect transplant scaffold according to claim 3, characterized in that, The inner wall of the outer tube is provided with a insertion groove corresponding to the position of the second support plate, and the second support plate is inserted into the insertion groove.

5. The bone defect transplant scaffold according to claim 4, characterized in that, In the extending direction of the outer tube, one end of the insertion groove is open and the other end is closed.

6. The bone defect transplant scaffold according to claim 3, characterized in that, The first support plate is integrally formed with the inner tube body; And / or, the second support plate is integrally formed with the inner tube body.

7. The bone defect transplant scaffold according to claim 3, characterized in that, The first support plate is provided with a plurality of spaced-apart first through holes; And / or, the second support plate is provided with a plurality of spaced-apart second through holes.

8. The bone defect transplant scaffold according to claim 1, characterized in that, The outer tube body is provided with multiple spaced-apart third through holes.

9. The bone defect transplant scaffold according to claim 1, characterized in that, The inner tube has an opening that connects the accommodating cavity and the internal channel of the inner tube.

10. The bone defect transplant scaffold according to claim 1, characterized in that, The inner tube is made of polylactic acid. In the extending direction of the inner tube, a slit is provided on the side wall of the inner support to allow the inner tube to be unfolded through the slit.

11. The bone defect transplant scaffold according to any one of claims 1 to 10, characterized in that, The outer tube is provided with a weight-reducing groove; And / or, the outer tube material is a titanium alloy.

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