An arc-shaped traction device for repairing maxillofacial bone defects

Abstract

The present invention belongs to the field of maxillofacial bone repair technology, and in particular, is an arc-shaped traction device for repairing maxillofacial bone defects. In view of the problem that the maxillofacial bone repair in the prior art is that a hard alloy sheet is only fixed on it and cannot produce traction on the bone, the following scheme is proposed, including a main rod similar to the curved shape of the jaw body, the main rod is in a Y-shaped structure as a whole, and the main rod includes a main pull rod and two branch rods, a sliding socket is provided at the end of the main pull rod of the main rod, and a convex rod is slidably inserted in the sliding socket, and a fixed curved rod is reserved at one end of the convex rod away from the main rod; the ends of the two branch rods are respectively reserved with a convex rod one and a convex rod two with a smaller diameter than the branch rod. The present invention can generate continuous traction from three directions, so that the bone can continuously adjust the pulling force during the healing process, and then make the postoperative bone healing more seamless, and the surface of the main rod is round and smooth, which reduces the pressure on the skin and reduces the pain.

Description

Technical Field

[0001] The invention relates to the technical field of maxillofacial bone repair, and in particular to an arc-shaped traction device for repairing maxillofacial bone defects. Background Art

[0002] Jaw defect not only seriously affects important life functions such as chewing, swallowing, and language, but more seriously, it can also cause serious psychological and social problems. The repair of jaw defect should not only consider the restoration of appearance and function, but also pay attention to the stability and reliability of the treatment effect. For a long time, the ideal jaw defect repair technology has been an important research direction and pursuit goal in the field of stomatology.

[0003] In recent decades, scholars have devoted themselves to the study of maxillofacial bone defect repair and opened up a new path, namely tissue engineering bone. The main advantages of tissue engineering bone are its good osteogenic ability and low infectivity and no immune rejection caused by autologous cell sources. The concept of tissue engineering bone includes three elements: seed cells, scaffold materials and cytokines. Among them, the scaffold material determines the shape of the reconstructed tissue, which is of great significance for the repair of facial bone defects with high requirements for appearance and function. Therefore, the scaffold material plays an important role in the tissue engineering repair of jaw bone defects.

[0004] Currently, commonly used tissue engineering bone scaffold materials are mainly divided into two categories, namely artificial synthetic materials and natural materials. Artificial synthetic materials include polymer organic matter and bioceramics. Polymer organic matter has insufficient mechanical strength and cannot be used in load-bearing parts; while bioceramics are brittle, difficult to plasticize, and difficult to degrade. Natural scaffold materials have a structure close to normal bone tissue, but residual antigenicity is the main problem of this type of scaffold material. Summary of the invention

[0005] The present invention proposes an arc-shaped traction device for repairing maxillofacial bone defects, comprising a main rod similar to the curved shape of the jaw body, the main rod being in a Y-shaped structure as a whole, and comprising a main pull rod and two branch rods, a sliding socket is provided at the end of the main pull rod of the main rod away from the branch rod, and a convex rod is slidably inserted in the sliding socket, and a fixed bent rod is reserved at the end of the convex rod away from the main rod; a convex rod 1 and a convex rod 2 with a smaller diameter than the branch rod are respectively reserved at the ends of the two branch rods, and a transverse pull rod and an upper pull rod are slidably sleeved on the outer walls of the convex rod 1 and the convex rod 2, and a tension spring is fixed to the ends of the convex rod 1, the convex rod 2 and the convex rod, and the two ends of the tension spring are respectively fixedly connected to the contact position, An upper pressure plate is provided at the end of the pull rod and the upper pull rod away from the main rod, and the inclination angle and shape of the plate surfaces of the two upper pressure plates are adapted to the surface shape of the mandible body; a fixed foot plate is provided at the end of the fixed curved rod away from the main rod, and a concave surface with an arc adapted to the curvature of the mandible body is reserved on the side of the fixed foot plate close to the mandible body; by setting a main rod that is integrally fitted to the mandible body, the overall fitting effect can be greatly reduced, and with the main rod with an overall Y-shaped structure and tension springs at three ends, continuous traction can be generated from three directions, so that the bone continuously adjusts the pulling force during the healing process, thereby making the bone healing more seamless after surgery, and the surface of the main rod is round and smooth, which reduces the pressure on the skin and reduces the pain.

[0006] A further configuration of the present invention is that an anti-twist slider is reserved near the end of the circumferential outer wall of the convex rod, and a sliding groove is opened on the inner wall of the sliding socket in the same direction as the extension direction of the sliding socket, and the anti-twist slider is slidably connected in the sliding groove; through the combination of the anti-twist slider and the sliding groove, the fixed bent rod can avoid twisting when the angle is set and ready for installation.

[0007] A further configuration of the present invention is that a sealing ring groove is opened on the circumferential inner wall at the opening of the sliding socket, and a sealing ring is clamped in the sealing ring groove, which can prevent blood stains from flowing into the sliding socket and causing internal blockage, thereby affecting the effective function of the tension spring.

[0008] A further configuration of the present invention is that the main rod, upper pull rod, transverse pull rod and fixed bent rod are all made of titanium alloy material, and a small amount of Nb element is added to the material to improve the toughness and strength of the components.

[0009] A further configuration of the present invention is that the fixed bent rod, the upper pull rod and the transverse pull rod are all provided with self-locking screw holes at one end away from the main rod, and studs are reserved on the side of the fixed foot plate and the two upper pressure plates close to the self-locking screw holes, and the two upper pressure plates are provided with stepped through holes near both ends on the side away from the mandibular body, and non-rotatable hexagonal nuts are clamped in the stepped through holes, and a tension-type alloy screw is threaded in the hexagonal nut. Through the cooperation of the set studs and the self-locking screw holes, the drilling and fixing position can be made more free, reducing the difficulty of the operation.

[0010] A further configuration of the present invention is that the circumferential edges of the upper pressure plate and the fixed foot plate are rounded to avoid edge corrosion caused by protruding edges.

[0011] A further configuration of the present invention is that the outer walls of the main pull rod of the main rod and the branch rod extending upward are fixed with vertical rib plates, and the rib plates are provided with equidistantly distributed perforations; by providing rib plates with perforations, a splint can be set in special circumstances, i.e., in the case of comminuted fractures, to assist in the fixation of the splint.

[0012] A further configuration of the present invention is that a triangular rib is fixed in the middle of the main rod between the two branch rods to improve the overall tensile strength.

[0013] A further configuration of the present invention is that screw holes are opened at both ends of the fixed foot plate, and a plurality of V-shaped grooves are reserved on the side of the fixed foot plate close to the mandibular body; by setting the V-shaped grooves in the concave surface, it is possible to avoid the fixed foot plate and the surface of the mandibular body being too tightly fitted, and space can be reserved for bone healing.

[0014] A further configuration of the present invention is that a convex shaft extending toward the mandibular body is fixed at the intersection position of the main rod, and an anti-falling rotating shaft is fixed at the end of the convex shaft, a straight groove rotating plate is sleeved on the outer wall of the anti-falling rotating shaft, and an anti-sticking gasket is fixed between the straight groove rotating plate and the mandibular body; by providing a rotatable straight groove rotating plate, during surgery, if the middle part of the mandibular body is broken or damaged, the middle part of the mandibular body can be fixed on the straight groove rotating plate first, and then the mandibular bodies at both ends can be fixed. At this time, both ends will generate a traction force that converges toward the middle, and then the mandibular bodies are tightly combined into a whole, which is beneficial to postoperative recovery.

[0015] The beneficial effects of the present invention are:

[0016] 1. The main rod is designed to fit the jawbone as a whole, which can greatly reduce the overall fitting effect. Combined with the main rod with an overall Y-shaped structure and the tension springs at three ends, it can generate continuous traction from three directions, so that the bone can continuously adjust the tension during the healing process, and then make the postoperative bone healing more seamless. The surface of the main rod is round and smooth, which reduces the pressure on the skin and reduces the pain.

[0017] 2. Through the coordination of the set studs and self-locking screw holes, the punching and fixing positions can be made more flexible. First, one of the most difficult punching positions is selected, that is, the position of the upper pressure plate is fixed, and then the upper pressure plate is fixed on the upper pull rod or the horizontal pull rod, thereby reducing the difficulty of the operation.

[0018] 3. By setting a rib plate with perforations, in special circumstances, i.e., comminuted fractures, the end of the device can be first fixed to a good bone, and then a splint is set in the middle to shape the comminuted part, and finally the rib plate is used to assist in fixing the overall position of the splint.

[0019] 4. By setting up a rotatable straight groove rotating plate, during the operation, if the middle part of the mandible body is broken or damaged, the middle part of the mandible body can be fixed on the straight groove rotating plate first, and then the mandible bodies at both ends can be fixed. At this time, both ends will generate traction pulling force converging toward the middle, and then the mandible body will be tightly combined into a whole, which is beneficial to postoperative recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of an arc-shaped traction device for repairing maxillofacial bone defects proposed by the present invention after installation;

[0021] Figure 2 This is a front view of an arc-shaped traction device for repairing maxillofacial bone defects proposed by the present invention after installation;

[0022] Figure 3 A three-dimensional diagram of an arc-shaped traction device for repairing maxillofacial bone defects proposed by the present invention;

[0023] Figure 4 An assembly diagram of an arc-shaped traction device for repairing maxillofacial bone defects proposed by the present invention;

[0024] Figure 5 This is an assembly diagram of a main rod in an arc-shaped traction device for repairing maxillofacial bone defects proposed by the present invention;

[0025] Figure 6 This is a structural diagram of a fixed foot plate in an arc-shaped traction device for repairing maxillofacial bone defects proposed by the present invention;

[0026] Figure 7This is a side view of the shell structure of an arc-shaped traction device for repairing maxillofacial bone defects proposed by the present invention.

[0027] In the figure: 1, main rod; 101, protruding rod two; 2, rib plate; 3, perforation; 4, protruding rod; 5, fixed bent rod; 6, screw hole; 7, fixed foot plate; 8, straight groove rotating plate; 9, anti-sticking gasket; 10, jaw body; 11, upper pressure plate; 12, alloy screw; 13, upper pull rod; 14, horizontal pull rod; 15, hexagonal nut; 16, triangular rib; 17, protruding rod one; 18, stepped through hole; 19, protruding shaft; 20, anti-falling rotating shaft; 21, stud; 22, self-locking screw hole; 23, sliding socket; 24, tension spring; 25, anti-twist slider; 26, sealing ring groove; 27, V-shaped groove. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] Reference Figure 1-7 , an arc-shaped traction device for repairing maxillofacial bone defects, comprising a main rod 1 with a similar curved shape to a mandibular body 10, ensuring that the main rod 1 fits on the surface of the mandibular body 10, the main rod 1 is in a Y-shaped structure as a whole, and the main rod 1 comprises a main pull rod and two branch rods, a sliding socket 23 is provided at the end of the main pull rod of the main rod 1 away from the branch rod, and a convex rod 4 is slidably inserted in the sliding socket 23, and a fixed bent rod 5 is reserved at the end of the convex rod 4 away from the main rod 1; a convex rod 17 and a convex rod 2 101 with a smaller diameter than the branch rod are reserved at the ends of the two branch rods, and a transverse pull rod 14 and an upper pull rod 13 are slidably sleeved on the outer walls of the convex rod 17 and the convex rod 2 101, and a tension spring 24 is fixed to the ends of the convex rod 17, the convex rod 2 101 and the convex rod 4, and the two ends of the tension spring 24 are respectively connected to The contact position is fixedly connected, and an upper pressure plate 11 is provided at one end of the lateral pull rod 14 and the upper pull rod 13 away from the main rod 1. The inclination angle and shape of the plate surface of the two upper pressure plates 11 are adapted to the surface shape of the mandibular body 10; a fixed foot plate 7 is provided at one end of the fixed curved rod 5 away from the main rod 1, and a concave surface whose arc is adapted to the curvature of the mandibular body 10 is reserved on the side of the fixed foot plate 7 close to the mandibular body 10; by setting the main rod 1 that is integrally fitted with the mandibular body 10, the overall fitting effect can be greatly reduced, and with the main rod 1 that is an overall Y-shaped structure and the tension springs 24 at three ends, continuous traction can be generated from three directions, so that the bone continuously adjusts the tension during the healing process, thereby making the bone healing after surgery more seamless, and the surface of the main rod 1 is round and smooth, which reduces the pressure on the skin and reduces the pain.

[0030] In the present invention, an anti-twist slider 25 is reserved near the end of the circumferential outer wall of the protruding rod 4, and a sliding groove consistent with the extension direction of the sliding hole 23 is opened on the inner wall of the sliding hole 23, and the anti-twist slider 25 is slidably connected in the sliding groove; through the combination of the anti-twist slider 25 and the sliding groove, the fixed bent rod 5 can avoid twisting when the angle is set and ready for installation.

[0031] Reference Figure 5 A sealing ring groove 26 is formed on the inner wall of the opening of the sliding hole 23, and a sealing ring is clamped in the sealing ring groove 26, which can prevent blood stains from flowing into the sliding hole 23 and causing internal blockage, thereby affecting the effective function of the tension spring 24.

[0032] In the present invention, the main rod 1, the upper pull rod 13, the transverse pull rod 14 and the fixed bent rod 5 are all made of titanium alloy material, and a small amount of Nb element is added to the material to improve the toughness and strength of the components.

[0033] Reference Figure 2 The fixed bent rod 5, the upper pull rod 13 and the lateral pull rod 14 are all provided with self-locking screw holes 22 at one end away from the main rod 1, and the fixed foot plate 7 and the two upper pressure plates 11 are both provided with studs 21 on one side close to the self-locking screw holes 22, and the two upper pressure plates 11 are both provided with stepped through holes 18 near both ends on the side away from the mandibular body 10, and a non-rotatable hexagonal nut 15 is clamped in the stepped through hole 18, and a tension-type alloy screw 12 is screwed in the hexagonal nut 15, and the cooperation of the set stud 21 and the self-locking screw hole 22 can make the punching and fixing position more free, thereby reducing the difficulty of the operation.

[0034] In the present invention, the circumferential edges of the upper pressing plate 11 and the fixed foot plate 7 are rounded to avoid edge corrosion caused by protruding edges.

[0035] Reference Figure 7 The outer walls of the main pull rod of the main rod 1 and the branch rod extending upward are fixed with vertical rib plates 2, and the rib plates 2 are provided with equidistantly distributed perforations 3; by providing the rib plates 2 with perforations 3, a splint can be provided in special circumstances, i.e., in the case of comminuted fractures, to assist in the fixation of the splint.

[0036] Reference Figure 7 A triangular rib 16 is fixed in the middle of the main rod 1 between the two branch rods to improve the overall tensile strength.

[0037] Reference Figure 6 Screw holes 6 are provided at both ends of the fixed foot plate 7, and a plurality of V-shaped grooves 27 are reserved on the side of the fixed foot plate 7 close to the mandibular body 10; by setting the V-shaped grooves 27 in the concave surface, it is possible to avoid the fixed foot plate 7 from being too tightly fitted to the surface of the mandibular body 10, and space can be reserved for bone healing.

[0038] Reference Figure 1 and Figure 3-4 A convex shaft 19 extending toward the mandibular body 10 is fixed at the intersection of the main rod 1, and an anti-falling rotating shaft 20 is fixed at the end of the convex shaft 19, and a straight groove rotating plate 8 is sleeved on the outer wall of the anti-falling rotating shaft 20, and an anti-sticking gasket 9 is fixed between the straight groove rotating plate 8 and the mandibular body 10; by setting up a rotatable straight groove rotating plate 8, during the operation, if the middle part of the mandibular body 10 is broken or damaged, the middle part of the mandibular body 10 can be fixed on the straight groove rotating plate 8 first, and then the mandibular body 10 at both ends can be fixed. At this time, both ends will generate a traction force that converges toward the middle, and then the mandibular body 10 is tightly combined into a whole, which is beneficial to postoperative recovery.

[0039] When the device is used, the damaged mandibular body 10 is first sutured with nails, and then the device is fixed to the two ends of the damaged part and fixed with alloy screws 12; before fixing, the fixed curved rod 5, the upper pull rod 13 and the transverse pull rod 14 are pulled along the sliding direction to ensure that the tension spring 24 is in a stretched state, so that it has a tendency to elastically recover, and then a continuous traction force is generated to pull the bones at both ends toward the middle; secondly, through the rotatable straight groove rotating plate 8, during the operation, once the middle part of the mandibular body 10 is broken and damaged, the middle part of the mandibular body 10 is first fixed on the straight groove rotating plate 8, and then the mandibular body 10 at both ends is fixed. At this time, both ends will generate a traction force that converges toward the middle, and then the mandibular body 10 is tightly combined into a whole, which is conducive to postoperative recovery.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An arc-shaped traction device for repairing maxillofacial bone defects, comprising a main rod (1) having a curved shape similar to that of a jawbone body (10), the main rod (1) being in a Y-shaped structure as a whole, and comprising a main pull rod and two branch rods, characterized in that: The main rod of the main rod (1) is provided with a sliding socket (23) at the end of the main rod away from the branch rod, and a protruding rod (4) is slidably inserted in the sliding socket (23), and a fixed bent rod (5) is reserved at the end of the protruding rod (4) away from the main rod (1); the ends of the two branch rods are respectively reserved with a protruding rod 1 (17) and a protruding rod 2 (101) with a smaller diameter than the branch rod, and the outer walls of the protruding rod 1 (17) and the protruding rod 2 (101) are slidably sleeved with a transverse pull rod (14) and an upper pull rod (13), and the protruding rod 1 (17), the protruding rod 2 (101) and the protruding rod (4) are The ends of the two ... The fixed bent rod (5), the upper pull rod (13) and the transverse pull rod (14) are provided with self-locking screw holes (22) at one end away from the main rod (1), and the fixed foot plate (7) and the two upper pressure plates (11) are provided with studs (21) on one side close to the self-locking screw holes (22), and the two upper pressure plates (11) are provided with stepped through holes (18) near both ends on one side away from the jaw body (10), and a non-rotatable hexagonal nut (15) is clamped in the stepped through hole (18), and a tension-type alloy screw (12) is screwed into the hexagonal nut (15); A convex shaft (19) extending toward the jaw body (10) is fixed at the intersection of the main rod (1), and an anti-falling rotating shaft (20) is fixed at the end of the convex shaft (19), a straight groove rotating plate (8) is sleeved on the outer wall of the anti-falling rotating shaft (20), and an anti-sticking gasket (9) is fixed between the straight groove rotating plate (8) and the jaw body (10).

2. The arc-shaped traction device for repairing maxillofacial bone defects according to claim 1, characterized in that: An anti-twist sliding block (25) is reserved near the end of the circumferential outer wall of the protruding rod (4), and a sliding groove is opened on the inner wall of the sliding insertion hole (23) in the same extending direction as the sliding insertion hole (23), and the anti-twist sliding block (25) is slidably connected in the sliding groove.

3. The arc-shaped traction device for repairing maxillofacial bone defects according to claim 2, characterized in that: A sealing ring groove (26) is formed on the inner circumferential wall of the opening of the sliding insertion hole (23), and a sealing ring is clamped in the sealing ring groove (26).

4. The arc-shaped traction device for repairing maxillofacial bone defects according to claim 1, characterized in that: The main rod (1), the upper pull rod (13), the transverse pull rod (14) and the fixed bent rod (5) are all made of a titanium alloy material, to which a small amount of Nb element is added to improve the toughness and strength of the components.

5. The arc-shaped traction device for repairing maxillofacial bone defects according to claim 1, characterized in that: The circumferential edges of the upper pressing plate (11) and the fixed foot plate (7) are rounded to prevent protruding edges from causing rust.

6. The arc-shaped traction device for repairing maxillofacial bone defects according to claim 1, characterized in that: The main pull rod of the main rod (1) and the outer walls of the branch rods extending upwards are both fixed with vertical rib plates (2), and the rib plates (2) are both provided with perforations (3) distributed at equal distances.

7. The arc-shaped traction device for repairing maxillofacial bone defects according to claim 1, characterized in that: A triangular rib (16) is fixed in the middle of the main rod (1) between the two branch rods to improve the overall tensile strength.

8. The arc-shaped traction device for repairing maxillofacial bone defects according to claim 1, characterized in that: Screw holes (6) are provided at both ends of the fixed foot plate (7), and a plurality of V-shaped grooves (27) are reserved on one side of the fixed foot plate (7) close to the jaw body (10).

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