Fracture distraction reduction device

Abstract

The application provides a fracture distraction reduction device, which comprises a center frame, a push plate, a rotating shaft, an anti-rotation frame and a connecting rod, and a right internal thread hole is arranged in the center frame. The hexagon in the rotating shaft is rotated by a tool, so that the center frame and the nut move relatively or oppositely on the rotating shaft, the axial distance of the two is increased or decreased, the connecting rod is rotated, the plurality of push plates are folded or expanded towards the rotating shaft, the connecting rods on the center frame and the anti-rotation frame always support the push plates during the expansion of the support frame, the push rod is in a stable and controllable translational state relative to the center frame, the expansion and contraction of the push plate are realized by controlling the outer hexagon of the anti-rotation frame and the inner hexagon in the center of the rotating shaft, only the compressed vertebral cavity is supported, the axial pressure on the vertebral cavity is not needed, and the injury of the patient is not aggravated.

Description

Technical Field

[0001] This invention relates to a fracture dislocation and reduction device. Background Technology

[0002] Osteoporosis is a common disease among the elderly, leading to decreased bone strength. If subjected to external impact, the force concentrated on the spine can cause vertebral compression fractures. Vertebral compression fractures can cause varying degrees of pain, spinal deformities, functional impairment, and paralysis, among other complications. Approximately 20%-40% of patients also experience nerve damage, significantly increasing the economic burden on families and society. Because most elderly patients have underlying medical conditions, open surgery for fracture reduction and fixation is not suitable. Minimally invasive surgery, with its minimal trauma, less damage to muscles and bone, fewer complications, and faster recovery, is a good option for elderly patients.

[0003] Minimally invasive spinal techniques such as vertebroplasty (PVP) and kyphoplasty (PKP) rely on injecting bone cement to fill the vertebral body. However, these techniques carry the risk of cement leakage outside the vertebral canal and into blood vessels. Furthermore, the cement hardening process generates heat that can damage surrounding tissues. More importantly, the non-absorbable nature of bone cement within the vertebral body limits its application in young and middle-aged patients. Therefore, there is a need for a fracture distraction and reduction device that is simple in structure, easy to operate, and highly stable. This device can be implanted minimally invasively to distract and reduce the injured vertebra, restoring vertebral height and shape, and providing assurance for accelerated bony healing and improved vertebral strength.

[0004] For example, a scaffold that can be opened and supported for bone grafts, disclosed in CN209136833U, achieves opening and closing functions through the lever principle, which can meet the requirements of minimally invasive medical surgery. However, during the opening or closing process of the scaffold, the movement of the push plate is generated by the sliding of the push plate in two sliding holes through the left rocker rivet and the right rocker rivet. This will lead to two situations: first, due to the certain gap between the rivet and the sliding groove, the stability of the device will decrease, and it will be easy to wobble; second, according to the degree of freedom calculation, the axial movement of the push plate is not constrained, so the push plate is not controlled during the opening or closing process of the scaffold.

[0005] For example, the vertebral body shaping system and vertebral body shaping bracket disclosed in CN114343928A hinges a support plate to a control shaft and a housing. The control shaft slides within the housing, causing the hinge points on the housing and the control shaft to move closer or further apart, thus supporting the support plate and moving it away from or closer to the housing. However, the housing can only slide on the one-way groove of the control shaft after the end of the bracket is pressed against the patient's vertebral cavity. Because of the one-way groove between the housing and the control shaft, a certain amount of pressure is required to apply pressure to the control rod while pressing against the vertebral cavity. This pressure may further damage the vertebral cavity and worsen the patient's condition. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a fracture dislocation and reduction device.

[0007] The present invention is achieved through the following technical solutions.

[0008] The present invention provides a fracture dislocation and reduction device, comprising a central frame, push plates, a rotating shaft, an anti-rotation frame, and connecting rods. The central frame is provided with a positive internal thread hole; the anti-rotation frame is provided with a negative internal thread hole. The two ends of the rotating shaft are respectively provided with external threads corresponding to the positive internal thread hole and the negative internal thread hole. The central frame and the anti-rotation frame are respectively installed on the corresponding external threads. Multiple push plates are parallel and surround the outer end of the central frame. Each push plate is hinged with several connecting rods, and the other end of the connecting rods is hinged to the central frame and the anti-rotation frame.

[0009] The central frame includes a first cylinder. Several third hinge seats and second hinge seats are evenly provided at both ends of the outer wall of the first cylinder and are hinged to the connecting rods respectively. The corresponding third hinge seats and second hinge seats are on the same straight line.

[0010] The bottom of both the third hinge seat and the second hinge seat is machined with elongated holes.

[0011] The third hinge seat is located at the far end of the anti-rotation frame. A first reinforcing plate is fixedly connected to the end of the first cylinder. The side of the first reinforcing plate is connected to the third hinge seat, and the top of the connection point is a plane.

[0012] The anti-rotation frame includes a second cylinder. The outer wall of one end of the second cylinder is provided with a first hinge seat, which has the same number and spacing as the third hinge seat or the first cylinder. The bottom of the first hinge seat is machined with an elongated hole of the same width as the central frame.

[0013] The other end of the second cylinder is machined with an external hexagonal cap, and a second support platform is machined on the edge of the external hexagonal cap to connect with the first hinge seat, and the top of the connection is a plane.

[0014] A reinforcing rib is provided radially in the middle of one end face of the push plate. A through groove is machined on the reinforcing rib. A first push plate hinge seat and a second push plate hinge seat are provided on the through groove. The two ends of the first push plate hinge seat are connected to the first hinge seat and the second hinge seat respectively through connecting rods. The second push plate hinge seat is connected to the third hinge seat through connecting rods. Support wings are connected to both sides of the push plate.

[0015] The support wing is connected to the push plate at an obtuse angle. The support wing includes a first wing, a second wing, and a third wing. The first wing and the second wing are located at both ends of the hinge seat of the second push plate, and the second wing and the third wing are located at both ends of the hinge seat of the first push plate.

[0016] The bottom of the first push plate hinge seat and the second push plate hinge seat are machined with strip-shaped holes.

[0017] The shaft has an internal hexagonal hole machined at one end where the anti-rotation frame is installed.

[0018] The beneficial effects of this invention are as follows: by using a tool to rotate the inner hexagon of the shaft, the central frame and the nut move relative to or towards each other on the shaft, increasing or decreasing the axial distance between them. This causes the connecting rod to rotate, causing multiple push plates to retract or expand towards the shaft. During the expansion of the support, the connecting rods on the central support and the anti-rotation support always support the push plates, and the push rods are in a stable and controllable translational state relative to the central support. Furthermore, by controlling the outer hexagon of the anti-rotation support and the inner hexagon of the shaft center to achieve the expansion and contraction of the push plates, only the compressed vertebral cavity is supported, without putting axial pressure on the vertebral cavity, thus avoiding aggravating the patient's injury. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the central frame structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the push plate structure of the present invention;

[0022] Figure 4 This is a schematic diagram of the rotating shaft structure of the present invention;

[0023] Figure 5 This is a schematic diagram of the nut structure of the present invention;

[0024] Figure 6 This is a schematic diagram of the linkage structure of the present invention;

[0025] Figure 7 This is a schematic diagram of the workflow of the present invention;

[0026] In the diagram: 1-Central frame, 101-Internal threaded hole, 102-Second rivet hole, 103-First cylinder, 104-Third rivet hole, 105-First reinforcing plate, 106-First support platform, 107-Third hinge seat, 108-Third rotating groove, 109-Second rotating groove, 111-Second hinge seat, 2-Push plate, 201-Third push plate rivet hole, 202-Second push plate rivet hole, 203-First push plate rivet hole, 204-First wing, 205-First push plate rotating groove, 206-Second push plate rotating groove, 207-Third push plate rotating groove 208-Third wing, 209-Second wing, 211-Reinforcing rib, 212-First push plate hinge seat, 213-Through slot, 214-Second push plate hinge seat, 3-Rivet, 4-Rotating shaft, 401-Positive external thread, 402-Reverse external thread, 403-Internal hexagonal hole, 5-Anti-rotation frame, 501-Second cylinder, 502-Second reinforcing plate, 503-Reverse internal thread hole, 504-External hexagonal cap, 505-Second support platform, 506-First rotating slot, 507-First hinge seat, 508-First rivet hole, 6-Connecting rod, 601-Hinge hole. Detailed Implementation

[0027] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0028] like Figure 1 As shown, a fracture dislocation and reduction device includes a central frame 1, push plates 2, a rotating shaft 4, an anti-rotation frame 5, and connecting rods 6. The central frame 1 has a positive internal thread hole 101; the anti-rotation frame 5 has a negative internal thread hole 503. Both ends of the rotating shaft 4 have external threads corresponding to the positive internal thread hole 101 and the negative internal thread hole 503, respectively. The central frame 1 and the anti-rotation frame 5 are respectively mounted on their corresponding external threads. Multiple push plates 2 are parallel and surround the outer end of the central frame 1. Each push plate 2 is hinged with several connecting rods 6, and the other ends of the connecting rods 6 are hinged to the central frame 1 and the anti-rotation frame 5. Figure 7 As shown, the rotation angles between the center frame 1 and the anti-rotation frame 5 are synchronized by the push plate 2 and the connecting rod 6. During the rotation of the rotating shaft 4, the rotation of the anti-rotation frame 5 is restricted from following the rotation of the shaft, so the center frame 1 also does not follow the rotation of the shaft 4. Therefore, when the rotating shaft 4 rotates, the anti-rotation frame 5 and the center frame 1 can translate on the rotating shaft 4. Since the threads of the anti-rotation frame 5, the center frame 1, and the rotating shaft 4 are opposite, the anti-rotation frame 5 and the center frame 1 can only translate towards or away from each other on the rotating shaft 4. When the anti-rotation frame 5 and the center frame 1 move away from each other, the angle between the connecting rod 6 and the center frame 1 gradually decreases, causing the push plate 2 to gradually move closer to the center frame until the push plate and the center frame are in contact. When they move closer to each other, the angle between the connecting rod 6 and the center frame 1 gradually increases, causing the push plate 2 to gradually expand away from the center frame, and the push plate will open up the injured vertebra.

[0029] like Figure 2 As shown, the central frame 1 includes a first cylinder 103. Two sets of hinge seats are respectively provided at both ends of the outer wall of the first cylinder 103. They are fixed to the first cylinder at 120° by three third hinge seats 107 and three second hinge seats 111. Each third hinge seat 107 and the second hinge seat 111 has a third rivet hole 104 and a second rivet hole 102 respectively machined in the center, and is hinged to the connecting rod 6 by rivets.

[0030] like Figure 2 As shown, the bottom of the third hinge seat 107 and the second hinge seat 111 are respectively machined with a third rotating groove 108 and a second rotating groove 109. The third rotating groove 108 and the second rotating groove 109 prevent the outer wall of the first cylinder 103 from interfering with the rotation of the connecting rod 6. Furthermore, the end of the first cylinder 103 is fixedly connected to a first reinforcing plate 105. The side of the first reinforcing plate 105 is connected to the third hinge seat 107 to prevent the third rotating groove 108 from being too long, which would cause it to expand during the rotation of the shaft and cause the first cylinder to slide on the shaft. A first support platform 106 is provided at the top of the connection between the first reinforcing plate 105 and the third hinge seat 107. The top of the first support platform 106 is flush with the top of the third hinge seat 107 and both are planes. This can support the push plate 2 after it is retracted, preventing the push plate 2 from being suspended in the air, which would not only affect the placement of the device but also easily cause the rivets between the hinge seat and the connecting rod to loosen, affecting the accuracy.

[0031] like Figure 5 As shown, the anti-rotation frame 5 includes a second cylinder 501. The outer wall of one end of the second cylinder 501 is provided with three first hinge seats 507. The three first hinge seats 507 are also fixed at 120° on the second cylinder 501. Similarly, the bottom of the first hinge seat 507 is machined with a first rotation groove 506 of the same width as the center frame 1.

[0032] like Figure 5 As shown, in order to facilitate limiting the second cylinder to rotate with the shaft 4, an external hexagonal cap 504 is machined at the other end of the second cylinder 501. Similarly, a second support platform 505 is machined on the edge of the external hexagonal cap 504 and connected to the first hinge seat 507, so that its top forms the second support platform 505.

[0033] like Figure 3As shown, since the push plate has a through groove 213 in the middle, and the bottom of the through groove 213 also has a first push plate rotation groove 205, a second push plate rotation groove 206, and a third push plate rotation groove 207, reinforcing ribs 211 are processed on both sides of the through groove 205 to increase the strength of the push plate. The through groove 213 is provided with a first push plate hinge seat 212 and a second push plate hinge seat 214. The connection points with the anti-rotation frame 5 and the center frame 1 are all located at both ends of the first push plate hinge seat 212, so that the tension of the push plate by the connecting rod 6 during the process of the anti-rotation frame 5 and the center frame 1 moving away from and approaching each other is borne by a whole hinge seat, reducing the pressure received by the push plate.

[0034] like Figure 5 The support wing shown is connected to the push plate 2 at an obtuse angle. The support wing includes a first wing 204, a second wing 209, and a third wing 208. In order to leave space for installing rivets, the first wing 204 and the second wing 209 are at both ends of the second push plate hinge seat 214, and the interval between them can be used to install one rivet. The second wing 209 and the third wing 208 are at both ends of the first push plate hinge seat 212, and the interval between them can be used to install two rivets.

[0035] Similarly, in order to leave room for the rotation of the rotating shaft 6, the bottom of the first push plate hinge seat 212 and the second push plate hinge seat 214 are machined with a first push plate rotation groove 205, a second push plate rotation groove 206, and a third push plate rotation groove 207, and each rotation groove is centered on the center of the rivet hole.

[0036] like Figure 4 The outer wall of the shaft 4 shown has a positive external thread 401 and a negative external thread 402. The lengths of the positive external thread 401 and the negative external thread 402 are similar to the lengths of the center frame 1 and the anti-rotation frame 5, respectively. An internal hexagonal hole 403 is machined at one end of the anti-rotation frame 5 to facilitate the rotation of the shaft 4.

Claims

1. A fracture dislocation and reduction device, comprising a central frame (1), a push plate (2), a rotating shaft (4), an anti-rotation frame (5), and a connecting rod (6), wherein the central frame (1) is provided with a positive internal thread hole (101), characterized in that: The anti-rotation frame (5) has a reverse internal thread hole (503) inside. The two ends of the rotating shaft (4) are respectively provided with external threads corresponding to the positive internal thread hole (101) and the reverse internal thread hole (503). The center frame (1) and the anti-rotation frame (5) are respectively installed on the corresponding external threads. Multiple push plates (2) are parallel and surround the outer end of the center frame (1). Several connecting rods (6) are hinged on each push plate (2). The other end of the connecting rods (6) is hinged to the center frame (1) and the anti-rotation frame (5). The anti-rotation frame (5) includes a second cylinder (501). The outer wall of one end of the second cylinder (501) is provided with a first hinge seat (507) with the same number and spacing as the third hinge seat (107) or the first cylinder (103). The bottom of the first hinge seat (507) is machined with an elongated hole of the same width as that on the central frame (1). The other end of the second cylinder (501) is machined with an external hexagonal cap (504), and a second support platform (505) is machined on the edge of the external hexagonal cap (504) to connect with the first hinge seat (507), and the top of the connection is flat; The push plate (2) has a reinforcing rib (211) radially arranged in the middle of one end face. A through groove (213) is machined on the reinforcing rib (211). A first push plate hinge seat (212) and a second push plate hinge seat (214) are arranged on the through groove (213). The two ends of the first push plate hinge seat (212) are connected to the first hinge seat (507) and the second hinge seat (111) respectively through the connecting rod (6). The second push plate hinge seat (214) is connected to the third hinge seat (107) through the connecting rod (6). Support wings are connected to both sides of the push plate (2). The support wing is connected to the push plate (2) at an obtuse angle. The support wing includes a first wing (204), a second wing (209), and a third wing (208). The first wing (204) and the second wing (209) are at both ends of the second push plate hinge seat (214), and the second wing (209) and the third wing (208) are at both ends of the first push plate hinge seat (212).

2. The fracture dislocation and reduction device as described in claim 1, characterized in that: The central frame (1) includes a first cylinder (103). The outer walls of the first cylinder (103) are evenly provided with several third hinge seats (107) and second hinge seats (111) at both ends, which are hinged to the connecting rods (6). The corresponding third hinge seats (107) and second hinge seats (111) are on the same straight line.

3. The fracture dislocation and reduction device as described in claim 2, characterized in that: The bottom of the third hinge seat (107) and the second hinge seat (111) are both machined with elongated holes.

4. The fracture dislocation and reduction device as described in claim 3, characterized in that: The third hinge seat (107) is located at the far end of the anti-rotation frame (5). The first reinforcing plate (105) is fixedly connected to the end of the first cylinder (103). The side of the first reinforcing plate (105) is connected to the third hinge seat (107), and the top of the connection is a plane.

5. The fracture dislocation and reduction device as described in claim 1, characterized in that: The bottom of the first push plate hinge seat (212) and the second push plate hinge seat (214) are machined with strip-shaped holes.

6. The fracture dislocation and reduction device as described in claim 1, characterized in that: The rotating shaft (4) has an internal hexagonal hole (403) machined at one end where the anti-rotation bracket (5) is installed.

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