Combined external fixing frame

Abstract

The invention relates to a combined external fixing frame which comprises a base provided with a bottom pressing plate. The primary joint seat is connected with the base; a first-stage pressing plate is arranged on the first-stage joint seat; the second-stage joint seat is connected with the first-stage joint seat; a second-stage pressing plate is arranged on the second-stage joint seat; the bone nail rod is inserted between the base and the bottom pressing plate, between the first-stage joint seat and the first-stage pressing plate or between the second-stage joint seat and the second-stage pressing plate; the bone nail head is in threaded connection with the bone nail rod; wherein a first-stage joint pressing plate is further arranged on the base; the first-stage joint seat extends between the first-stage joint pressing plate and the base; a second-stage joint pressing plate is arranged on the first-stage joint seat; and the second-stage joint seat extends between the first-stage joint seat and the second-stage joint pressing plate. The bone nail rod is in threaded connection with the bone nail head. For patients with different diseases and physiques, the diameter of the bone nail can be adjusted only by changing the size of the bone nail head. And at the moment, the size of the fixing rod for connecting the base, the first-stage joint seat and the second-stage joint seat is not changed.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a combined external fixator. Background Art

[0002] The modular external fixator is composed of a bracket and bone screws, which supports and fixes bones in multiple planes to treat open fractures, complex orthopedics and minimally invasive treatment scenarios.

[0003] The thickness of the bone screw directly affects the contact area between the bone screw and the human bone. The larger the diameter of the bone screw, the greater the pull-out resistance and the more stable the connection with the human bone. However, bone screws that are too large will cause greater trauma to the human bone, and the diameter of the bone screw is generally controlled below 6mm. However, when treating patients with osteoporosis, the patient's bone density is low, the trabeculae are thinner and the structure is loose, resulting in a reduction in the contact area between the bone screw and the heat exchange bone, a lower pull-out resistance of the bone screw, and the bone screw is easy to move during treatment, affecting the treatment effect. At this time, increasing the diameter of the bone screw can directly increase the contact area between the bone screw and the patient's bone, thereby improving the stability of the bone screw fixed in the patient's body. However, commonly used sizes of brackets cannot clamp bone screws of such large diameters, and special brackets need to be specially customized to adapt to bone screws of such large diameters, which is costly.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute prior art known to ordinary technicians in the field. Summary of the Invention

[0005] In view of the above shortcomings of the prior art, an object of the present invention is to provide a combined external fixator to improve the versatility of the combined external fixator.

[0006] The technical solutions of the present invention are as follows:

[0007] A combined external fixator, comprising:

[0008] A base, provided with a bottom pressure plate;

[0009] A first-level joint seat is connected to the base; a first-level pressure plate is provided on the first-level joint seat;

[0010] A secondary joint seat is connected to the primary joint seat; a secondary pressure plate is provided on the secondary joint seat;

[0011] a bone screw rod inserted between the base and the bottom pressure plate, between the primary joint seat and the primary pressure plate, or between the secondary joint seat and the secondary pressure plate;

[0012] a bone screw head, threadedly connected to the bone screw rod;

[0013] Among them, a first-level joint pressure plate is also provided on the base; the first-level joint seat extends between the first-level joint pressure plate and the base; a second-level joint pressure plate is provided on the first-level joint seat; the second-level joint seat extends between the first-level joint seat and the second-level joint pressure plate.

[0014] A further technical solution is that through holes are respectively opened in the bone nail head and the bone nail rod along the axis of the bone nail head; a screw hole is opened at one end of the bone nail head close to the bone nail rod; and an external thread is provided on the bone nail rod to connect with the screw hole.

[0015] A further technical solution is that it also includes a clamping block; the clamping block is provided with an external thread; when the bone screw head is not connected to the bone screw rod, the clamping block is threadedly connected to the screw hole; the clamping block blocks the through hole of the bone screw head near one end of the bone screw rod.

[0016] A further technical solution is that the bone screw rod includes a clamping section and a connecting section; the clamping section extends between the base and the bottom pressure plate, between the first-level joint seat and the first-level pressure plate, or between the second-level joint seat and the second-level pressure plate; an external thread is provided on the connecting section; the outer diameter of the connecting section is smaller than the outer diameter of the clamping section.

[0017] A further technical solution is that a filling hole is provided on the outer surface of the bone nail head; and the filling hole is connected to the through hole.

[0018] A further technical solution is that a hydroxyapatite coating is provided on the outer surface of the bone nail head.

[0019] A further technical solution is that the surfaces facing each other between the base and the bottom pressure plate, the surfaces facing each other between the first-level joint seat and the first-level pressure plate, and the surfaces facing each other between the second-level joint seat and the second-level pressure plate are all recessed to form bone screw grooves; the bone screw rod extends into the bone screw groove, and the inner wall of the bone screw groove fits the outer surface of the bone screw rod.

[0020] Its further technical solution is that a slot is provided on the base; a joint positioning seat and a limit block are arranged in the slot; a threaded fastener is connected to the side of the limit block away from the joint positioning seat; the threaded fastener passes through the base and is connected to the limit block; the joint positioning seat is arranged between the base and the limit block; the first-level joint seat extends between the first-level joint pressure plate and the joint positioning seat.

[0021] A further technical solution is that a concave-convex surface is provided on a side of the limit block close to the joint positioning seat; and a concave-convex outer surface is provided on the joint positioning seat to be plugged into the concave-convex surface.

[0022] Its further technical solution is that the base and the bottom pressure plate, the base and the first-level joint pressure plate, the first-level joint seat and the first-level pressure plate, the first-level joint seat and the second-level joint pressure plate, and the second-level joint seat and the second-level pressure plate are all connected by threaded fasteners.

[0023] The beneficial technical effects of the present invention are as follows:

[0024] (1) The combined external fixator of the present invention is provided with a base, a primary joint seat and a secondary joint seat. The primary joint seat can be rotated around the base, and the secondary joint seat can be rotated around the primary joint seat. In addition, bone screw rods can be provided on the base, the primary joint seat and the secondary joint seat. By rotating between the various components, the angle of fixation of the bone screw rod can be flexibly adjusted, and the adjustment range of the bone screw is large. The bone screws with high degrees of freedom enable the combined external fixator to support the patient's bones in more planes. At different stages of treatment, the position and orientation of the bone screws can also be flexibly adjusted to adapt to the position movement of the patient's bones and accurately match the patient's bone morphology. In addition, the bone screw includes a bone screw rod and a bone screw head, and the bone screw rod and the bone screw head are threadedly connected. When adjusting the diameter of the bone screw for patients with different diseases and physical conditions, it is only necessary to change the size of the bone screw head. At this time, the size of the fixing rod connecting the base, the primary joint seat and the secondary joint seat does not need to be changed, and when replacing the bone screw head, it is only necessary to ensure that the bone screw rod and the bone screw head can be connected. At this time, replacing the bone screw head of any size will not affect the connection relationship between the bone screw rod and the base, the first-level joint seat and the second-level joint seat, greatly improving the versatility of the base, the first-level joint seat and the second-level joint seat.

[0025] (2) Furthermore, a filling hole is provided on the bone nail head. After the bone nail head enters the patient's bone, bone cement is injected along the through hole. The bone cement injected into the through hole can enter the space between the patient's bone and the bone nail along the filling hole. After the bone cement contacts the bone, it will penetrate into the trabeculae and micropores, significantly improving the pull-out resistance of the bone nail head. This is especially true for patients with osteoporosis, significantly reducing the risk of loosening of the bone nail head in the bone.

[0026] (3) Furthermore, a hydroxyapatite coating is provided on the outer surface of the bone nail head. After the bone nail head enters the patient's bone, the bone nail head directly contacts the bone through the hydroxyapatite coating. The composition of the hydroxyapatite coating is highly similar to that of the bone tissue. After the bone nail head with the hydroxyapatite coating is inserted into the bone, it can form a "biological bond" with the bone rather than a simple mechanical lock, significantly improving the connection strength between the bone nail head and the bone. At the same time, the hydroxyapatite coating can be partially absorbed and metabolized by the patient, promoting the patient's bone regeneration. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1A schematic diagram of the vertical cross-section structure of the base, joint positioning seat, primary joint seat and secondary joint seat in the combined external fixator of an embodiment of the present disclosure is shown.

[0028] Figure 2 A schematic diagram of the exploded structure of a bone screw rod, a clamping block and a bone screw head in a combined external fixator according to an embodiment of the present disclosure is shown.

[0029] Figure 3 A schematic diagram of the exploded structure of a bone screw rod, a clamping block and a bone screw head in a combined external fixator according to an embodiment of the present disclosure is shown.

[0030] In the accompanying drawings:

[0031] 1. Base; 11. Bottom pressure plate; 12. Bone screw groove; 13. Slide groove; 131. Movable pressure plate; 14. Clamping slot; 2. Joint positioning seat; 21. First-level joint pressure plate; 22. Limiting block; 23. Concave and convex outer surface; 3. First-level joint seat; 31. First-level pressure plate; 32. Second-level joint pressure plate; 33. First-level limiting groove; 4. Second-level joint seat; 41. Second-level pressure plate; 42. Limiting protrusion; 421. Second-level limiting groove; 5. Bone screw rod; 51. Limiting end; 52. Clamping section; 53. Connecting section; 531. External thread; 532. Reducing section; 6. Clamping block; 7. Bone screw head; 71. Through hole; 72. Filling hole; 73. Screw hole; 74. Blade; 8. Threaded fastener. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clear, the device proposed in the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the drawings are in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the efficacy and purpose that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention.

[0033] In the description of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like are defined as indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0034] Figure 1 A schematic diagram of the vertical cross-section structure of the base, joint positioning seat, primary joint seat and secondary joint seat in the combined external fixator of an embodiment of the present disclosure is shown. Figure 2 The exploded structure diagram of the bone screw rod, the block and the bone screw head in the combined external fixator of one embodiment of the present disclosure is shown. Figure 1 and Figure 2 The combined external fixator includes a base 1, a primary joint seat 3, a secondary joint seat 4, a bone screw rod 5 and a bone screw head 7. The base 1 is provided with a bottom pressure plate 11. The primary joint seat 3 is connected to the base 1. A primary pressure plate 31 is provided on the primary joint seat 3. The secondary joint seat 4 is connected to the primary joint seat 3. A secondary pressure plate 41 is provided on the secondary joint seat 4. The primary joint seat 3 can be rotated around the base 1, and the secondary joint seat 4 can be rotated around the primary joint seat 3. The bone screw rod 5 is inserted between the base 1 and the bottom pressure plate 11, between the primary joint seat 3 and the primary pressure plate 31, or between the secondary joint seat 4 and the secondary pressure plate 41. The bone screw head 7 is threadedly connected to the bone screw rod 5. A blade 74 is provided at one end of the bone screw head 7 away from the bone screw rod 5 to facilitate the insertion of the bone screw head 7 into the bone.

[0035] The base 1 is also provided with a primary joint pressure plate 21. The primary joint seat 3 extends between the primary joint pressure plate 21 and the base 1. A secondary joint pressure plate 32 is provided on the primary joint seat 3. The secondary joint seat 4 extends between the primary joint seat 3 and the secondary joint pressure plate 32. The rotation of the various components allows for flexible adjustment of the angle of the bone screw rod 5, resulting in a wide adjustment range for the bone screw. The high degree of freedom of the bone screw allows the modular external fixator to support the patient's bones in a variety of planes. The position and orientation of the bone screw can also be flexibly adjusted at different stages of treatment to accommodate the patient's bone movements and precisely match the patient's skeletal morphology. Furthermore, the bone screw includes a bone screw rod 5 and a bone screw head 7, which are threadedly connected to each other. To adjust the diameter of the bone screw for patients with different medical conditions and physical conditions, the size of the bone screw head 7 only needs to be changed. The size of the fixing rod connecting the base 1, the primary joint seat 3, and the secondary joint seat 4 does not need to be changed, and when replacing the bone screw head 7, it is only necessary to ensure that the bone screw rod 5 and the bone screw head 7 are connected. At this time, replacing the bone screw head 7 of any size will not affect the connection relationship between the bone screw rod 5 and the base 1, the first-level joint seat 3 and the second-level joint seat 4, greatly improving the versatility of the base 1, the first-level joint seat 3 and the second-level joint seat 4.

[0036] In some embodiments, the base 1 and the bottom pressure plate 11 can be provided as a whole or as a separate body. When the base 1 and the bottom pressure plate 11 are provided as a whole, a gap is left between the base 1 and the bottom pressure plate 11. By adjusting the width of the gap, the distance between the base 1 and the bottom pressure plate 11 can be adjusted to clamp or loosen the bone screw rod 5. Similarly, in some embodiments, the joint positioning seat 2 and the primary joint pressure plate 21 can be provided as a whole or as a separate body. When the joint positioning seat 2 and the primary joint pressure plate 21 are provided as a whole, a gap is left between the joint positioning seat 2 and the primary joint pressure plate 21. The primary joint seat 3, the primary pressure plate 31 and the secondary joint pressure plate 32 can be provided as a whole or as a separate body. The secondary joint seat 4 and the secondary pressure plate 41 can be provided as a whole or as a separate body.

[0037] Please refer to Figure 1 and Figure 2 Along the axis of the bone nail head 7, a through hole 71 is respectively formed in the bone nail head 7 and the bone nail rod 5. The through hole 71 facilitates the bone nail head 7 to be nailed into the bone along the guide pin. A screw hole 73 is formed at one end of the bone nail head 7 near the bone nail rod 5, and an external thread 531 is provided on the bone nail rod 5 to connect with the screw hole 73. The aperture of the screw hole 73 is larger than the aperture of the through hole 71. The increase in the aperture of the screw hole 73 increases the effective cross-sectional area of the internal thread inside the screw hole 73, thereby improving the ability of the threaded connection between the bone nail rod 5 and the bone nail head 7 to withstand tensile loads and disperse shear stress. At the same time, the increase in the aperture of the screw hole 73 can increase the pitch and thread depth of the internal thread inside the screw hole 73, thereby improving the ability of the bone nail head 7 and the bone nail rod 5 to resist shear failure.

[0038] Preferably, a clamping block 6 is further included. The clamping block 6 is provided with an external thread 531. When the bone screw head 7 is not connected to the bone screw rod 5, the clamping block 6 is threadedly connected to the screw hole 73. The clamping block 6 blocks the through hole 71 of the bone screw head 7 near one end of the bone screw rod 5. This prevents the screw hole 73 and the through hole 71 from being exposed after the bone screw rod 5 and the bone screw head 7 are separated.

[0039] More preferably, the bone screw rod 5 includes a clamping section 52 and a connecting section 53. The clamping section 52 extends between the base 1 and the bottom pressure plate 11, between the primary joint seat 3 and the primary pressure plate 31, or between the secondary joint seat 4 and the secondary pressure plate 41. The screw rod of the clamping section 52 can be cylindrical or polygonal. When the clamping section 52 is cylindrical, the bone screw groove 12 is also an arc-shaped groove to conform to the outer surface of the fixing rod. In this case, the bone screw rod 5 can rotate at any angle around its own axis within the bone screw groove 12. When the clamping section 52 is a polygonal cylinder, the cross-section of the bone screw rod 5 within the clamping section 52 in a plane perpendicular to the axis of the bone screw rod 5 is polygonal. In this case, the bone screw groove 12 is also a polygonal groove to conform to the outer surface of the bone screw rod 5. The polygonal cross-section of the bone screw groove 12 restricts the rotation of the bone screw rod 5 within the bone screw groove 12. The connecting section 53 is provided with an external thread 531, which is threadedly connected to the bone screw head 7. The threaded connection is flexible in assembly and disassembly, and has excellent mechanical properties after connection, and can effectively withstand axial tension, shear force and torsional force, thereby ensuring the connection strength between the bone screw rod 5 and the bone screw head 7.

[0040] In some embodiments, the outer diameter of the connecting section 53 is smaller than the outer diameter of the clamping section 52, so that a diameter reducing section 532 is formed between the connecting section 53 and the clamping section 52. When the bone screw rod 5 is threadedly connected to the bone screw head 7, the diameter reducing section 532 can quickly determine the relative position between the bone screw rod 5 and the bone screw head 7.

[0041] In some embodiments, the bone screw rod 5 is further provided with a limiting segment, which is located at the end of the clamping segment 52 away from the connecting segment 53. The limiting segment has a polygonal cross-section in a plane perpendicular to the length of the bone screw rod 5, which facilitates clamping the limiting end 51 and driving the limiting end 51 to rotate about the screw hole 73 to connect or disconnect the bone screw rod 5 and the bone screw head 7.

[0042] Figure 3 The exploded structure diagram of the bone screw rod, the block and the bone screw head in the combined external fixator of one embodiment of the present disclosure is shown. Figure 1 and Figure 2A filling hole 72 is formed on the outer surface of the bone screw head 7, and the filling hole 72 is connected to the through hole 71. Bone cement is injected through the through hole 71 and can enter the space between the patient's bone and the bone screw along the filling hole 72. After contacting the bone, the bone cement will penetrate into the trabeculae and micropores, significantly improving the pull-out resistance of the bone screw head 7. This is especially true for patients with osteoporosis, significantly reducing the risk of loosening of the bone screw head 7 within the bone.

[0043] In some embodiments, the outer surface of the bone nail head 7 is coated with a hydroxyapatite coating. Once inserted into the patient's bone, the nail head 7 directly contacts the bone through the hydroxyapatite coating, which has a composition highly similar to bone tissue. Once inserted into the bone, the hydroxyapatite-coated nail head 7 forms a "biological bond" with the bone, rather than a simple mechanical connection, significantly enhancing the connection strength between the nail head 7 and the bone. Furthermore, the hydroxyapatite coating is partially absorbed and metabolized by the patient, promoting bone regeneration.

[0044] Preferably, the facing surfaces between the base 1 and the bottom pressure plate 11, the facing surfaces between the first joint seat 3 and the first pressure plate 31, and the facing surfaces between the second joint seat 4 and the second pressure plate 41 are all recessed to form bone screw grooves 12. The bone screw rod 5 extends into the bone screw grooves 12, and the inner wall of the bone screw grooves 12 conforms to the outer surface of the bone screw rod 5, thereby increasing the contact area between the bone screw rod 5 and the base 1, bottom pressure plate 11, first joint seat 3, first pressure plate 31, second joint seat 4, and second pressure plate 41, thereby improving the stability of the fixation of the bone screw rod 5.

[0045] Please refer to Figure 1 and Figure 2 , a slot 14 is provided on the base 1. A joint positioning seat 2 and a limit block 22 are arranged in the slot 14. The limit block 22 is connected to a threaded fastener 8 on the side away from the joint positioning seat 2. In the application, the threaded fastener 8 can be a bolt, a stud, a screw, etc. The threaded fastener 8 is connected to the limit block 22 after passing through the base 1. The joint positioning seat 2 is arranged between the base 1 and the limit block 22. Tightening the threaded fastener 8 connected to the limit block 22 can push the limit block 22 toward the joint positioning seat 2 until the limit block 22 and the base 1 cooperate to clamp the position of the joint positioning seat 2. The first-level joint seat 3 extends between the first-level joint pressure plate 21 and the joint positioning seat 2 to connect the position between the first-level joint seat 3 and the base 1.

[0046] Preferably, a concave-convex surface is provided on the side of the stop block 22 adjacent to the joint positioning seat 2. A concave-convex outer surface 23 is provided on the joint positioning seat 2 to engage with the concave-convex surface. The concave-convex surface on the stop block 22 engages with the concave-convex outer surface 23, effectively restricting the joint positioning seat 2 from sliding along the surface of the stop block 22 and improving the stability of the joint positioning seat 2 fixed within the slot 14.

[0047] More preferably, the base 1 and the bottom pressure plate 11, the base 1 and the first-level joint pressure plate 21, the first-level joint seat 3 and the first-level pressure plate 31, the first-level joint seat 3 and the second-level joint pressure plate 32, and the second-level joint seat 4 and the second-level pressure plate 41 are all connected by threaded fasteners 8.

[0048] Please refer to Figure 1 and Figure 2 A chute 13 is further defined between the base 1 and the bottom pressure plate 11, and a movable pressure plate 131 is disposed within the chute 13. Parallel to the direction of the bottom pressure plate 11, the width of the chute 13 is greater than the width of the movable pressure plate 131, meaning that the movable pressure plate 131 can slide within the chute 13. Furthermore, when the bone screw rod 5 extends into the chute 13, the sliding pressure plate is disposed between the bone screw rod 5 and the base 1, meaning that the bone screw is clamped and fixed in position by the sliding pressure plate and the bottom pressure plate 11. By sliding the movable pressure plate 131 within the chute 13, the position and orientation of the bone screw rod 5 secured by the movable pressure plate 131 can be flexibly adjusted, further enhancing the degree of freedom of support of the combined external fixator.

[0049] Preferably, a first-level limiting groove 33 is provided on the outer surface of the first-level joint seat 3. When the first-level joint seat 3 extends between the first-level joint pressure plate 21 and the base 1. The threaded fastener 8 extends into the first-level limiting groove 33 after passing through the first-level joint pressure plate 21 to limit the movement of the first-level joint seat 3 and enhance the connection strength between the first-level joint pressure plate 21 and the joint positioning seat 2. The first-level limiting groove 33 is a complete circular ring, and the width direction of the first-level limiting groove 33 is perpendicular to the insertion direction of the first-level joint seat 3 when inserted between the first-level joint pressure plate 21 and the base 1. That is, when the threaded fastener 8 passing through the first-level joint pressure plate 21 is loosened, the threaded fastener 8 no longer contacts the first-level joint seat 3, but the threaded fastener 8 still extends into the first-level limiting groove 33, the first-level joint seat 3 can rotate around itself with its insertion direction as the rotation axis to adjust the orientation of the bone screw rod 5 on the first-level joint seat 3, and the first-level joint seat 3 will not fall off from between the first-level joint pressure plate 21 and the base 1, which is convenient for adjustment of the first-level joint seat 3.

[0050] More preferably, the secondary joint seat 4 is provided with a limiting protrusion 42, and the limiting protrusion 42 extends between the secondary joint pressure plate 32 and the primary joint seat 3. A secondary limiting groove 421 is provided on the outer surface of the limiting protrusion 42. When the secondary joint seat 4 extends between the secondary joint pressure plate 32 and the primary joint seat 3. The threaded fastener 8 passes through the secondary joint pressure plate 32 and then extends into the secondary limiting groove 421 to limit the movement of the secondary joint seat 4 and enhance the connection strength between the secondary joint seat 4 and the primary joint seat 3. The secondary limiting groove 421 is a complete circular ring, and the width direction of the secondary limiting groove 421 is perpendicular to the insertion direction of the secondary joint seat 4 when inserted between the secondary joint pressure plate 32 and the primary joint seat 3. That is, when the threaded fastener 8 passing through the secondary joint pressure plate 32 is loosened, the threaded fastener 8 no longer contacts the secondary tube joint seat, but the threaded fastener 8 still rises into the secondary limiting groove 421, the secondary joint seat 4 can rotate around itself with its insertion direction as the rotation axis to adjust the orientation of the bone screw rod 5 on the secondary joint seat 4, and the secondary joint seat 4 will not fall off from between the secondary joint pressure plate 32 and the primary joint seat 3, which facilitates the adjustment of the secondary joint seat 4.

[0051] The specific workflow of the present invention is as follows:

[0052] Select a bone screw head 7 of appropriate diameter and insert it into the patient's bone, and thread the bone screw rod 5 and the bone screw head 7. Then loosen the threaded fastener 8 between the base 1 and the bottom pressure plate 11, insert the bone screw rod 5 between the base 1 and the bottom pressure plate 11, and then tighten the threaded fastener 8. Loosen the threaded fastener 8 connecting the limit block 22, adjust the position angle of the joint positioning seat 2, and then tighten the threaded fastener 8. Loosen the threaded fastener 8 on the first-level joint pressure plate 21, insert the first-level joint seat 3 between the joint positioning seat 2 and the first-level joint pressure plate 21, and adjust the position angle of the first-level joint seat 3, and then tighten the threaded fastener 8. Loosen the threaded fastener 8 on the first-level pressure plate 31, fix the bone screw rod 5 between the first-level pressure plate 31 and the first-level joint seat 3, and then tighten the threaded fastener 8. Loosen the threaded fastener 8 on the second-level joint pressure plate 32, insert the second-level joint seat 4 between the first-level joint seat 3 and the second-level joint pressure plate 32, and then tighten the threaded fastener 8. Loosen the threaded fastener 8 on the secondary pressing plate 41, fix the bone screw rod 5 between the secondary pressing plate 41 and the secondary joint seat 4, and then tighten the threaded fastener 8. The installation of the combined external fixator is completed.

[0053] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. Combined external fixator, characterized in that: The combined external fixator comprises: A base, provided with a bottom pressure plate; A first-level joint seat is connected to the base; a first-level pressure plate is provided on the first-level joint seat; A secondary joint seat is connected to the primary joint seat; a secondary pressure plate is provided on the secondary joint seat; a bone screw rod inserted between the base and the bottom pressure plate, between the primary joint seat and the primary pressure plate, or between the secondary joint seat and the secondary pressure plate; a bone screw head, threadedly connected to the bone screw rod; Among them, a first-level joint pressure plate is also provided on the base; the first-level joint seat extends between the first-level joint pressure plate and the base; a second-level joint pressure plate is provided on the first-level joint seat; the second-level joint seat extends between the first-level joint seat and the second-level joint pressure plate.

2. The combined external fixator according to claim 1, wherein: Along the axis of the bone screw head, through holes are respectively formed in the bone screw head and the bone screw rod; a screw hole is formed at one end of the bone screw head close to the bone screw rod; and an external thread is provided on the bone screw rod to connect with the screw hole.

3. The combined external fixator according to claim 2, wherein: It also includes a clamping block; the clamping block is provided with an external thread; when the bone screw head is not connected to the bone screw rod, the clamping block is threadedly connected to the screw hole; the clamping block blocks the through hole of the bone screw head near one end of the bone screw rod.

4. The combined external fixator according to claim 1, wherein: The bone screw rod includes a clamping section and a connecting section; the clamping section extends between the base and the bottom pressure plate, between the first-level joint seat and the first-level pressure plate, or between the second-level joint seat and the second-level pressure plate; an external thread is provided on the connecting section; the outer diameter of the connecting section is smaller than the outer diameter of the clamping section.

5. The combined external fixator according to claim 2, wherein: A filling hole is provided on the outer surface of the bone nail head; the filling hole is connected to the through hole.

6. The combined external fixator according to claim 1, characterized in that: A hydroxyapatite coating is provided on the outer surface of the bone nail head.

7. The combined external fixator according to claim 1, wherein: The surfaces facing each other between the base and the bottom pressure plate, the surfaces facing each other between the first-level joint seat and the first-level pressure plate, and the surfaces facing each other between the second-level joint seat and the second-level pressure plate are all recessed to form bone screw grooves; the bone screw rod extends into the bone screw groove, and the inner wall of the bone screw groove fits the outer surface of the bone screw rod.

8. The combined external fixator according to claim 1, wherein: A slot is provided on the base; a joint positioning seat and a limit block are provided in the slot; a threaded fastener is connected to the side of the limit block away from the joint positioning seat; the threaded fastener passes through the base and is connected to the limit block; the joint positioning seat is provided between the base and the limit block; the first-level joint seat extends between the first-level joint pressure plate and the joint positioning seat.

9. The combined external fixator according to claim 8, wherein: A concave-convex surface is provided on one side of the limiting block close to the joint positioning seat; and a concave-convex outer surface is provided on the joint positioning seat to be plugged into the concave-convex surface.

10. The combined external fixator according to claim 1, wherein: The base and the bottom pressure plate, the base and the first-level joint pressure plate, the first-level joint seat and the first-level pressure plate, the first-level joint seat and the second-level joint pressure plate, and the second-level joint seat and the second-level pressure plate are all connected by threaded fasteners.

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