Spinal fusion device

Abstract

The application discloses a spinous process fusion device, which comprises a main body, an opening arm assembly and a movable arm assembly. A moving channel is arranged in the main body and penetrates through the first end of the axial direction of the main body. The opening arm assembly comprises a push rod and two opening arms. The two opening arms are pivotally arranged at the second end of the main body. A sliding part is arranged on the opening arm. The push rod is arranged in the moving channel. The first end of the push rod is provided with a matching part which is in sliding fit with the sliding part. The push rod is movable along the axial direction of the moving channel so as to adjust the included angle between the opening arm and the axial direction of the main body. The movable arm assembly is arranged on the main body and defines a clamping cavity together with the opening arm. The spinous process fusion device has simple structure design, is convenient to install and disassemble, and has high reliability after installation.

Description

Technical Field

[0001] This invention relates to the field of orthopedic implant technology, and more specifically to a spinous process fusion device. Background Technology

[0002] Spinal stenosis is a condition where the spinal canal narrows, compressing the spinal cord and nerves. It is generally caused by degenerative changes in the spine. Spinal stenosis can also be caused by herniated discs, osteoporosis, tumors, or other unexpected strenuous activities. For these spinal conditions, surgeons can use fusion devices to restore the normal spacing between adjacent vertebrae, thus achieving a therapeutic goal.

[0003] However, in related technologies, the fusion device has a complex structure, requires many parts, has a high risk of falling off and failing later, and is inconvenient to disassemble, resulting in poor performance. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of the present invention propose a spinous process fusion device with a simple structural design, easy installation and disassembly, and high reliability after installation.

[0006] The spinous process fusion device of an embodiment of the present invention includes: a main body, wherein a movable channel is provided within the main body and the movable channel extends through a first end of the main body along its axial direction; an opening arm assembly, wherein the opening arm assembly includes a push rod and two opening arms, the two opening arms being pivotally disposed at a second end of the main body, each opening arm having a sliding portion, the push rod being disposed within the movable channel, the first end of the push rod having a mating portion, the mating portion being slidably engaged with the sliding portion, the push rod being movable along the axial direction of the movable channel to adjust the angle between the opening arm and the axial direction of the main body; and a movable arm assembly, wherein the movable arm assembly is disposed on the main body and defines a clamping cavity with the opening arms.

[0007] According to an embodiment of the spinous process fusion device of the present invention, during implantation, a push rod can be moved in the direction toward the opening arm to drive the opening arm to open to a set angle. Then, the position of the movable arm assembly is adjusted so that the opening arm and the movable arm assembly clamp and fix adjacent vertebrae to fuse the vertebrae. When it is necessary to remove the spinous process fusion device, the movable arm assembly can be removed first, and then the push rod can be moved in the direction away from the opening arm, so that the push rod can drive the opening arm to retract, facilitating the removal of the spinous process fusion device from the body.

[0008] In the spinous process fusion device of the present invention, since the push rod is directly connected to the opening arm and the push rod and the opening arm are slidably connected through the sliding part and the mating part, the spinous process fusion device can be easily installed and disassembled, and the number of required parts is small, resulting in high stability and reliability after implantation.

[0009] In some embodiments, the opening arm assembly further includes a pusher and a guide, both located within the moving channel. The pusher is connected to the second end of the push rod, and the guide has a guide hole through which the push rod passes in a non-rotating manner. The pusher is axially movable along the moving channel to drive the push rod to move axially along the guide hole.

[0010] In some embodiments, at least one of the pusher and the guide is threadedly engaged with the moving channel; and / or, the second end of the push rod has a first locking protrusion, the pusher has a first locking groove, and the first locking protrusion is elastically engaged with the first locking groove.

[0011] In some embodiments, both the pusher and the guide are threadedly engaged with the moving channel. The pusher has a first stepped surface, and the guide has a second stepped surface. The guide has a first state and a second state. In the first state, the pusher and the guide are spaced apart, and the pusher can drive the push rod to move axially along the guide hole. In the second state, the first stepped surface and the second stepped surface abut against each other, and the pusher can drive the guide to rotate, thereby causing the push rod to move axially along the guide hole and rotate relative to the moving channel, so as to open and lock the opening arm.

[0012] In some embodiments, the first end of the push rod has a first recess, and when the opening arm is opened to a set angle, at least a portion of the opening arm is engaged in the first recess to restrict the movement of the opening arm relative to the main body; and / or, the opening arm is provided with a second recess, and when the opening arm is opened to a set angle, at least a portion of the mating part is engaged in the second recess to restrict the movement of the opening arm relative to the main body; and / or, the sliding part is a groove extending along the length direction of the opening arm, and the mating part is a locking pin slidably engaged in the groove; and / or, the end of the push member away from the guide member is provided with a drive groove; and / or, a limiting member is provided in the guide hole, and the limiting member cooperates with the push rod to restrict the rotation of the push rod relative to the guide hole.

[0013] In some embodiments, the position of the movable arm assembly along the axial direction of the body is adjustable to adjust the size of the clamping cavity.

[0014] In some embodiments, the movable arm assembly includes a sliding sleeve, a movable arm, and a rotating shaft. The sliding sleeve is disposed on the body and its position is adjustable along the axial direction of the body. The movable arm is disposed on the sliding sleeve. The rotating shaft passes through the movable arm and is connected to the sliding sleeve. The axial direction of the rotating shaft is orthogonal to the axial direction of the body. The movable arm is swayable about the axial direction of the rotating shaft.

[0015] In some embodiments, the movable arm includes a swing sleeve and two movable teeth. The swing sleeve is fitted onto the sliding sleeve, and the two movable teeth are respectively arranged on both sides of the swing sleeve. The movable teeth are rotatable between an open position and a retracted position. In the retracted position, the length direction of the movable teeth is parallel to the axial direction of the swing sleeve, and in the open position, the length direction of the movable teeth is orthogonal to the axial direction of the swing sleeve. Alternatively, the movable arm includes a swing sleeve and two movable teeth. The swing sleeve is fitted onto the sliding sleeve, and the two movable teeth are respectively arranged on both sides of the swing sleeve. The movable teeth are fixed relative to the swing sleeve, and the length direction of the movable teeth is orthogonal to the axial direction of the swing sleeve. And / or, the outer wall surface of the main body is provided with a rack, the rack extends along the axial direction of the main body, and the sliding sleeve is provided with locking teeth that elastically engage with the rack.

[0016] In some embodiments, the main body includes a first main body and a second main body, the second main body being disposed at one end of the first main body away from the opening arm, the first main body and the second main body being arranged coaxially, and the first main body and the second main body being detachably connected.

[0017] In some embodiments, one of the first body and the second body is provided with a second latching protrusion, and the other is provided with a second latching groove. The second latching protrusion is elastically engaged in the second latching groove, and the second body can rotate relative to the first body to disengage the second latching protrusion from the second latching groove.

[0018] In some embodiments, both the body and the push rod are provided with bone graft holes, which communicate with the moving channel; and / or, the outer peripheral wall of the body is provided with a threaded surface, which is adjacent to the second end of the body; and / or, the second end of the body is a pointed tip; and / or, the outer peripheral wall of the body is provided with a clamping groove, which is adjacent to the first end of the body; and / or, the end of the opening arm away from the body is provided with a first tooth tip. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the spinous process fusion device according to an embodiment of the present invention.

[0020] Figure 2This is a schematic diagram showing that both the opening arm assembly and the movable arm assembly of the spinous process fusion device according to an embodiment of the present invention are extended.

[0021] Figure 3 This is an exploded view of the spinous process fusion device according to an embodiment of the present invention.

[0022] Figure 4 This is a cross-sectional view of the spinous process fusion device (with the pusher and guide spaced apart) according to an embodiment of the present invention.

[0023] Figure 5 This is a cross-sectional view of the spinous process fusion device (with the pusher and guide members abutting each other) according to an embodiment of the present invention.

[0024] Figure 6 This is a schematic diagram of the spinous process fusion device according to an embodiment of the present invention, where the opening arm is not fully extended (after the first main body is removed).

[0025] Figure 7 This is a schematic diagram of the opening arm of the spinous process fusion device according to an embodiment of the present invention in its fully extended position (after the first main body is removed).

[0026] Figure 8 This is a partial schematic diagram of the opening arm assembly of the spinous process fusion device according to an embodiment of the present invention.

[0027] Figure 9 This is another partial schematic diagram of the opening arm assembly of the spinous process fusion device according to an embodiment of the present invention.

[0028] Figure 10 This is a schematic diagram of the push rod of the spinous process fusion device according to an embodiment of the present invention.

[0029] Figure 11 This is a schematic diagram of the first main body of the spinous process fusion device according to an embodiment of the present invention.

[0030] Figure 12 This is a schematic diagram of the second body of the spinous process fusion device according to an embodiment of the present invention.

[0031] Figure 13 This is a side view of the spinous process fusion device according to an embodiment of the present invention.

[0032] Figure 14 This is a schematic diagram of the opening arm of the spinous process fusion device according to an embodiment of the present invention.

[0033] Figure 15 This is a schematic diagram of the open arm of the spinous process fusion device according to an embodiment of the present invention.

[0034] Figure 16 This is a schematic diagram of the pusher of the spinous process fusion device according to an embodiment of the present invention.

[0035] Figure 17This is a cross-sectional view of the pusher component of the spinous process fusion device according to an embodiment of the present invention.

[0036] Figure 18 This is a schematic diagram of the guide component of the spinous process fusion device according to an embodiment of the present invention.

[0037] Figure 19 This is a schematic diagram of the movable arm of the spinous process fusion device according to an embodiment of the present invention.

[0038] Figure 20 This is a schematic diagram of the sliding sleeve of the spinous process fusion device according to an embodiment of the present invention.

[0039] Figure label:

[0040] 1. Main body; 11. Moving channel; 12. Rack; 13. First main body; 131. Second slot; 132. Threaded surface; 14. Second main body; 141. Second protrusion; 142. Clamping groove;

[0041] 2. Opening arm assembly; 21. Push rod; 211. Mating part; 2111. Locking post; 212. First locking protrusion; 213. First recessed part; 214. Bone graft hole; 22. Opening arm; 221. Sliding part; 2211. Sliding groove; 222. Second recessed part; 223. First tooth tip; 23. Pushing element; 231. First locking groove; 232. First stepped surface; 233. Drive groove; 24. Guide element; 241. Second stepped surface; 242. Guide hole; 25. Pin;

[0042] 3. Movable arm assembly; 31. Sliding sleeve; 311. Clamping tooth; 32. Movable arm; 321. Swinging sleeve; 3211. Rotary shaft hole; 322. Movable tooth; 3221. Second tooth tip; 33. Rotary shaft. Detailed Implementation

[0043] Embodiments of the present invention are described in detail below, examples of which are illustrated 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.

[0044] The following is for reference. Figures 1 to 20 A spinous process fusion apparatus according to an embodiment of the present invention is described.

[0045] like Figures 1 to 5 As shown, the spinous process fusion device according to an embodiment of the present invention includes: a main body 1, an opening arm assembly 2 and a movable arm assembly 3, wherein the opening arm assembly 2 includes a push rod 21 and two opening arms 22.

[0046] The main body 1 has a moving channel 11, which passes through the first end of the main body 1 along its axial direction (e.g., Figure 1(Right end of the main body 1). Two openable arms 22 are pivotally mounted at the second end of the main body 1 (e.g., the right end of the main body 1). Figure 1 The right end of the main body 1), the opening arm 22 is provided with a sliding part 221, the push rod 21 is provided in the moving channel 11, the first end of the push rod 21 (as shown in the image) Figure 3 The left end of the push rod 21 has a mating part 211, which is slidably engaged with the sliding part 221. The push rod 21 is movable along the axial direction of the moving channel 11 to adjust the angle between the opening arm 22 and the axial direction of the main body 1. The movable arm assembly 3 is provided on the main body 1 and defines a clamping cavity with the opening arm 22.

[0047] It is understandable that, such as Figure 4 and Figure 5 As shown, before the spinous process fusion device is implanted into the human body, the open arm 22 is in an unopened state, meaning the angle between the length direction of the open arm 22 and the axis of the main body 1 is small. For example, the angle between the length direction of the open arm 22 and the axis of the main body 1 is close to 0 degrees, which facilitates the insertion of the spinous process fusion device between adjacent vertebrae. After the spinous process fusion device is implanted into the human body and the open arm 22 is opened, the angle between the length direction of the open arm 22 and the axis of the main body 1 can be 90 degrees or close to 90 degrees, allowing the open arm 22 to conform to the bone surface of the vertebra.

[0048] According to an embodiment of the present invention, during the implantation of the spinous process fusion device, the push rod 21 can be moved toward the opening arm 22 to drive the opening arm 22 to open to a set angle. Then, the position of the movable arm assembly 3 is adjusted so that the opening arm 22 and the movable arm assembly 3 clamp and fix the adjacent vertebrae to fuse the vertebrae. When it is necessary to remove the spinous process fusion device, the movable arm assembly can be removed from the main body 1 first, and then the push rod 21 can be moved away from the opening arm 22, so that the push rod 21 can drive the opening arm 22 to retract, making it easier to remove the spinous process fusion device from the human body.

[0049] In the spinous process fusion device of the present invention, since the push rod 21 is directly connected to the opening arm 22, and the push rod 21 and the opening arm 22 are slidably connected through the sliding part 221 and the mating part 211, the spinous process fusion device can be easily installed and disassembled, and the number of required parts is small, and the stability and reliability after implantation are high.

[0050] Optionally, the position of the movable arm assembly 3 along the axial direction of the main body 1 is adjustable. Understandably, when the spinous process fusion device needs to be fixed, the movable arm assembly 3 can be pushed in a direction away from the opening arm 22 to reduce the clamping cavity formed between the movable arm assembly 3 and the opening arm 22, thereby clamping and fixing the vertebra. When the spinous process fusion device needs to be removed, the movable arm assembly 3 can be moved in a direction away from the opening arm 22 to increase the distance between the clamping cavities, thus providing sufficient space for the opening arm 22 to retract, facilitating the removal of the spinous process fusion device from the body. Furthermore, since the position of the movable arm assembly 3 along the axial direction of the main body 1 is adjustable, the spinous process fusion device can clamp vertebrae of different sizes, increasing its applicability.

[0051] In some embodiments, such as Figures 3 to 5 As shown, the opening arm assembly 2 also includes a pusher 23 and a guide 24, both located within the moving channel 11. The pusher 23 is connected to the second end of the push rod 21, and the guide 24 has a guide hole 242. The push rod 21 passes through the guide hole 242 in a non-rotating manner. The pusher 23 is axially movable along the moving channel 11 to drive the push rod 21 to move axially along the guide hole 242. It is understood that, as Figure 4 As shown, the pusher 23 is located at the right end of the push rod 21. The pusher 23 can drive the push rod 21 to move to the left or right, and the pusher 23 can stop the push rod 21 to prevent it from shaking in the moving channel 11, thereby improving the locking effect of the opening arm 22.

[0052] Optionally, such as Figures 3 to 5 As shown, the pusher 23 is threadedly engaged with the moving channel 11, and the guide 24 is also threadedly engaged with the moving channel 11. It is understood that the moving channel 11 has internal threads, and the outer walls of both the pusher 23 and the guide 24 are engaged with these internal threads. For example, the pusher 23 and the guide 24 can be plugs. In this embodiment of the spinous process fusion device, by threading the pusher 23 and the guide 24 with the moving channel 11, the pusher 23 and the guide 24 can be easily installed and removed. Furthermore, this design improves the anti-retraction effect of the pusher 23, reducing the loosening of the opening arm 22 caused by the pusher 23 retraction and improving the stability of the spinous process fusion device after implantation.

[0053] Optionally, the end of the pusher 23 away from the guide 24 is provided with a drive groove 233, for example, the drive tooth groove is a quincunx-shaped slot, so that the operator can use a quincunx wrench to rotate the pusher 23, thereby improving the ease of installation of the fusion device.

[0054] In some embodiments, such as Figure 10 and Figure 17 As shown, the second end of push rod 21 (as shown) Figure 10 The right end of the push rod has a first locking protrusion 212, and the push member 23 has a first locking groove 231. The first locking protrusion 212 and the first locking groove 231 are elastically engaged. It is understood that when the operator rotates the push member 23 to push the push rod 21 in the direction toward the opening arm 22, the push rod 21 will not rotate relative to the guide hole 242 due to the anti-rotation effect of the guide hole 242. Therefore, when the push member 23 rotates, the first locking protrusion 212 can rotate relative to the first locking groove 231.

[0055] For example, the first protrusion 212 is an annular protrusion and the first groove 231 is an annular groove, so that the rotation of the pusher 23 will not interfere with the axial movement of the push rod 21, making the linkage structure between the push rod 21 and the pusher 23 more reasonable.

[0056] Optionally, a limiting element (not shown) is provided in the guide hole 242, which cooperates with the push rod 21 to limit the rotation of the push rod 21 relative to the guide hole 242.

[0057] For example, the limiting component is a limiting plane. It can be understood that the inner peripheral wall of the guide hole 242 is provided with a limiting plane, and the limiting plane fits with the push rod 21, thereby preventing the push rod 21 from rotating relative to the guide hole 242.

[0058] For example, the limiting member is a screw or pin structure, and the limiting member is installed on the guide hole 242 or the push rod 21. Specifically, the guide hole 242 is provided with a limiting member that extends radially along the guide hole 242, and the push rod 21 is provided with a limiting groove (not shown) that extends along the length of the push rod 21. The limiting member fits in the limiting groove 21 and can slide along the length of the limiting groove 21, and the limiting member restricts the push rod 21 from rotating relative to the guide hole 242.

[0059] In some embodiments, such as Figure 16 and Figure 17 As shown, the pusher 23 has a first stepped surface 232, and the guide 24 has a second stepped surface 241. The guide 24 has a first state and a second state. In the first state, the pusher 23 and the guide 24 are spaced apart, and the pusher 23 can drive the push rod 21 to move axially along the guide hole 242. In the second state, the first stepped surface 232 and the second stepped surface 241 abut against each other, and the pusher 23 can drive the guide 24 to rotate, so as to drive the push rod 21 to move axially along the guide hole 242 and rotate relative to the moving channel 11, so as to open and lock the opening arm 22.

[0060] It is understandable that, such as Figure 4 and Figure 5As shown, when the opening arm 22 is initially opened, the pushing member 23 and the guide member 24 are spaced a certain distance apart, and the pushing member 23 gradually moves closer to the guide member 24. At this time, the push rod 21 can slowly open the opening arm 22 through the pushing action of the pushing member 23. After the opening arm 22 is opened to a certain angle, the pushing member 23 will contact the guide member 24, and the first step surface 232 and the second step surface 241 will abut against each other. When the pushing member 23 continues to rotate toward the guide member 24, the guide member 24 will also rotate synchronously under the action of the first step surface 232 and the second step surface 241. Then the guide member 24 will drive the push rod 21 to rotate, and the push rod 21 will continue to move toward the opening arm 22 while rotating, so that the opening arm 22 can be opened to the set angle. Due to the rotation action of the push rod 21, the opening arm 22 can be locked to restrict the movement of the opening arm 22 relative to the main body 1, thereby improving the locking effect of the opening arm 22. Therefore, the spinous process fusion device of the present invention, by setting the pusher 23 and the guide 24 to the above structure, can lock the opening arm 22 while opening it, thereby reducing the problem of the opening arm 22 becoming loose after the spinous process fusion device is implanted and improving the reliability of the spinous process fusion device.

[0061] Optionally, such as Figures 7 to 10 As shown, the first end of the push rod 21 has a first recess 213. When the opening arm 22 is extended to a set angle, at least a portion of the opening arm 22 is engaged in the first recess 213 to restrict the movement of the opening arm 22 relative to the main body 1. It can be understood that there are two first recesses 213, each corresponding to one of the two opening arms 22. For example, the first recess 213 may be a groove. When the opening arm 22 is extended to the set angle (i.e., when the opening arm 22 is fully extended), a portion of the opening arm 22 will be embedded in the first recess 213, thereby restricting the movement of the opening arm 22 and improving the fixing effect of the opening arm 22.

[0062] Optionally, such as Figure 9 and Figure 10 As shown, the sliding part 221 is a groove 2211, which extends along the length of the opening arm 22. The mating part 211 is a locking post 2111, which slides within the groove 2211. It can be understood that there are two mating parts 211 (locking posts 2111), each corresponding to a sliding part 221 (groove 2211) on one of the two opening arms 22. The fusion device for the spinous process of this invention, by configuring the sliding part 221 and the mating part 211 as described above, facilitates the manufacturing of the push rod 21 and the opening arm 22, and provides stable transmission and good performance.

[0063] Optionally, such as Figure 9 and Figure 10As shown, the opening arm 22 is provided with a second recess 222. When the opening arm 22 is opened to a set angle, the locking post 2111 engages with the second recess 222 to restrict the movement of the opening arm 22 relative to the main body 1. It can be understood that the second recess 222 is a groove and is connected to the sliding groove 2211. When the opening arm 22 is opened to the set angle (i.e., when the opening arm 22 is fully opened), the locking post 2111 will slide into the second recess 222 and engage with it, thereby further fixing the opening arm 22 to reduce the problem of loosening of the opening arm 22 and improve the stability of the spinous process fusion device after implantation.

[0064] For example, such as Figure 1 and Figure 2 As shown, the opening arm assembly 2 also includes a pin 25, which passes through the main body 1 and is connected to two opening arms 22. The axis of the pin 25 is orthogonal to the axis of the main body 1. Both opening arms 22 can swing around the axis of the pin 25, which facilitates the assembly of the opening arm assembly 2.

[0065] In some embodiments, such as Figure 6 , Figure 7 , Figure 19 and Figure 20 As shown, the movable arm assembly 3 includes a sliding sleeve 31, a movable arm 32, and a rotating shaft 33. The sliding sleeve 31 is mounted on the main body 1 and its position is adjustable along the axial direction of the main body 1. The movable arm 32 is mounted on the sliding sleeve 31. The rotating shaft 33 passes through a rotating shaft hole 3211 on the movable arm 32 and is connected to the sliding sleeve 31. The axial direction of the rotating shaft 33 is orthogonal to the axial direction of the main body 1. The movable arm 32 can swing around the axial direction of the rotating shaft 33. It can be understood that when the movable arm 32 is moved in the direction toward the opening arm 22 to clamp the adjacent vertebrae, the movable arm 32 can swing within a certain range, thereby allowing the movable arm 32 to better adapt to the shape of the vertebral bone surface, resulting in a higher fit between the movable arm 32 and the vertebral bone surface and a better fixation effect.

[0066] Optionally, such as Figure 19As shown, the movable arm 32 includes a swing sleeve 321 and two movable teeth 322. The swing sleeve 321 is fitted onto the sliding sleeve 31, and the two movable teeth 322 are respectively arranged on both sides of the swing sleeve 321. The movable teeth 322 are rotatable between an open position and a retracted position. In the retracted position, the length direction of the movable teeth 322 is parallel to the axis of the swing sleeve 321, and in the open position, the length direction of the movable teeth 322 is orthogonal to the axis of the swing sleeve 321. For example, the movable teeth 322 are detachably connected to the swing sleeve 321. In this embodiment, the movable teeth 322 are rotatably connected to the swing sleeve 321 via a pin. By configuring the movable teeth 322 with the above-described structure, the spinous process fusion device of this invention can achieve a higher degree of fit between the movable arm 32 and the vertebral bone surface. Furthermore, since the movable teeth 322 are detachably connected, different lengths of movable teeth 322 can be selected for different patients, thereby broadening the applicability of the spinous process fusion device.

[0067] Optionally, the movable arm 32 includes a swing sleeve 321 and two movable teeth 322. The swing sleeve 321 is fitted onto the sliding sleeve 31, and the two movable teeth 322 are respectively arranged on both sides of the swing sleeve 321. The movable teeth 322 are fixed relative to the swing sleeve 321, and the length direction of the movable teeth 322 is orthogonal to the axial direction of the swing sleeve 321. It can be understood that the swing sleeve 321 and the movable teeth 322 are integral structural components, which makes the structural design of the movable arm 32 simple and easy to assemble and process.

[0068] Optionally, such as Figure 11 , Figure 13 , Figure 19 and Figure 20 As shown, the outer wall of the main body 1 is provided with a rack 12, which extends along the axial direction of the main body 1. The sliding sleeve 31 is provided with locking teeth 311, which elastically engage with the rack 12. For example, the teeth on the rack 12 are ratchet teeth, meaning that the locking teeth 311 can only move in the direction toward the opening arm 22. When it is necessary to remove the ratchet fusion device, a special tool can be used to separate the locking teeth 311 from the rack 12, thereby separating the movable arm assembly 3 from the main body 1. The ratchet fusion device of the embodiment of the present invention, by connecting the sliding sleeve 31 to the main body 1 in the above manner, can avoid the problem of the movable arm assembly 3 retraction and improve the installation stability of the movable arm assembly 3.

[0069] Optionally, the sliding sleeve 31 can be fixed to the main body 1 by a threaded component. It is understood that the threaded component passes through the sliding sleeve 31 and abuts against the main body 1, thereby restricting the movement of the sliding sleeve 31 relative to the main body 1. When it is necessary to adjust the position of the sliding sleeve 31, the threaded component can be loosened to space it from the main body 1, thereby adjusting the position of the sliding sleeve 31. The ratchet fusion device of this embodiment of the invention, by connecting the sliding sleeve 31 to the main body 1 in the above manner, facilitates the processing and manufacturing of the ratchet fusion device and reduces costs.

[0070] Optionally, such as Figure 14 and Figure 15 As shown, each of the two opening arms 22 is provided with a first tooth tip 223. The first tooth tip 223 is located at the end of the opening arm 22 away from the main body 1. The first tooth tip 223 can cooperate with the vertebral bone surface, thereby improving the reliability of the connection between the opening arm 22 and the vertebral bone surface.

[0071] like Figure 2 and Figure 19 As shown, each of the two movable teeth 322 is provided with a second tooth tip 3221. The second tooth tip 3221 is located at the end of the movable tooth 322 away from the main body 1. The second tooth tip 3221 can cooperate with the vertebral bone surface, thereby improving the reliability of the connection between the movable tooth 322 and the vertebral bone surface.

[0072] In some embodiments, such as Figure 11 , Figure 12 and Figure 13 As shown, the main body 1 includes a first main body 13 and a second main body 14. The second main body 14 is located at the end of the first main body 13 opposite to the open arm 22. The first main body 13 and the second main body 14 are coaxially arranged and detachably connected. It is understood that the tail end of the main body 1 is detachable, so that after the spinous process fusion device is fixed, the second main body 14 can be removed from the first main body 13. This reduces the space occupied by the spinous process fusion device, minimizes the problem of the tail end of the spinous process fusion device compressing the intermuscular tissue, and improves the surgical outcome.

[0073] Optionally, such as Figure 11 , Figure 12 and Figure 13As shown, one of the first body 13 and the second body 14 is provided with a second latching protrusion 141, and the other is provided with a second latching groove 131. The second latching protrusion 141 is elastically engaged in the second latching groove 131. The second body 14 can rotate relative to the first body 13 so that the first latching protrusion 212 disengages from the second latching groove 131. For example, the first body 13 is provided with a second latching groove 131, and the second body 14 is provided with a second latching protrusion 141. Specifically, there are two second latching grooves 131 and two second latching protrusions 141. The two second latching grooves 131 are arranged at intervals along the circumference of the first body 13, and the two second latching grooves 131 correspond one-to-one with the two second latching protrusions 141.

[0074] It is understandable that, such as Figure 11 , Figure 12 and Figure 13 As shown, the second slot 131 and the second protrusion 141 are elastically engaged, allowing the second body 14 to drive the first body 13 to perform unidirectional rotation and lifting actions. When the second body 14 rotates in the opposite direction, the second protrusion 141 can separate from the second slot 131, thereby allowing the second body 14 to be detached. The fusion device for the spinous process of this invention, by connecting the first body 13 and the second body 14 in the above manner, facilitates the installation and disassembly of the second body 14 by operators, and has a simple structural design and is easy to manufacture.

[0075] In some embodiments, such as Figure 7 and Figure 11 As shown, both the main body 1 and the push rod 21 are provided with bone graft holes 214, which are connected to the moving channel 11. For example, there are multiple bone graft holes 214, which are arranged at intervals on the main body 1 or the push rod 21. In this embodiment, the push rod 21 has a hollow channel inside, and the multiple bone graft holes 214 extend in different directions and are all connected to the hollow channel, thereby promoting the fusion effect of the vertebral and spinous process fusion device and improving the stability of the spinous process fusion device after implantation.

[0076] Optionally, such as Figure 11 As shown, a threaded surface 132 is provided on the outer peripheral wall of the main body 1, and the threaded surface 132 is adjacent to the second end of the main body 1. For example, the threaded surface 132 is provided on the first main body 13. The spinous process fusion device of the present invention, by providing the threaded surface 132 on the outer periphery of the first main body 13, can facilitate the operator to screw the main body 1 between adjacent vertebrae, thereby shortening the operation time and improving the surgical effect.

[0077] Optionally, the second end of the main body 1 (e.g. Figure 1 The left end of the main body 1 is a pointed tip, which makes it easier to screw the main body 1 into the vertebra, thus improving the ease of installation of the spinous process fusion device.

[0078] In this embodiment, the main body 1 is provided with slots on both sides in the radial direction. The slots extend along the axial direction of the main body 1. When the opening arm 22 is not open, the two opening arms 22 can be placed in the two slots respectively, which makes it easier to screw the main body 1 into the vertebra and improves the ease of installation of the spinous process fusion device.

[0079] Optionally, such as Figure 2 and Figure 12 As shown, a clamping groove 142 is provided on the outer peripheral wall of the main body 1, and the clamping groove 142 is adjacent to the first end of the main body 1. Specifically, the clamping groove 142 is located at the end of the second main body 14 opposite to the first main body 13, and the clamping groove 142 can be an annular groove. The operator can use a special tool to clamp it in the annular groove to place the spinous process fusion device in the designated position, thereby facilitating the installation and disassembly of the spinous process fusion device, and the use effect is good.

[0080] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0081] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0082] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, 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 invention according to the specific circumstances.

[0083] In this invention, 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," "over," and "on top" of 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.

[0084] In this invention, 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 the invention. 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.

[0085] 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 spinous process fusion device, characterized in that, include: The main body has a moving channel inside it, and the moving channel passes through the first end of the main body along its axial direction; The opening arm assembly includes a push rod and two opening arms, which are pivotally disposed at the second end of the main body. Each opening arm has a sliding portion. The push rod is disposed within the moving channel. The first end of the push rod has a mating portion that slides with the sliding portion. The push rod is movable along the axial direction of the moving channel to adjust the angle between the opening arm and the axial direction of the main body. A movable arm assembly, which is disposed on the main body and defines a clamping cavity with the opening arm; The opening arm assembly further includes a pusher and a guide, both of which are located within the moving channel. The pusher is connected to the second end of the push rod, and the guide has a guide hole. The push rod passes through the guide hole in a non-rotating manner. The pusher is axially movable along the moving channel to drive the push rod to move axially along the guide hole. Both the pusher and the guide are threadedly engaged with the moving channel. The pusher has a first stepped surface, and the guide has a second stepped surface. The guide has a first state and a second state. In the first state, the pusher and the guide are spaced apart, and the pusher can drive the push rod to move axially along the guide hole. In the second state, the first stepped surface and the second stepped surface abut against each other, and the pusher can drive the guide to rotate, thereby causing the push rod to move axially along the guide hole and rotate relative to the moving channel, so as to open and lock the opening arm.

2. The spinous process fusion device according to claim 1, characterized in that, At least one of the pusher and the guide is threadedly engaged with the moving channel; And / or, the second end of the push rod has a first locking protrusion, and the pusher has a first locking groove, wherein the first locking protrusion is elastically engaged with the first locking groove.

3. The spinous process fusion device according to claim 1, characterized in that, The first end of the push rod has a first recess. When the opening arm is opened to a set angle, at least part of the opening arm is engaged in the first recess to restrict the movement of the opening arm relative to the main body. And / or, the opening arm is provided with a second recess, and when the opening arm is opened to a set angle, at least part of the mating part is engaged in the second recess to restrict the movement of the opening arm relative to the main body; And / or, the sliding part is a groove that extends along the length of the opening arm, and the mating part is a locking pin that slides within the groove; And / or, a drive groove is provided at the end of the pusher away from the guide member; And / or, a limiting element is provided in the guide hole, the limiting element cooperating with the push rod to restrict the push rod from rotating relative to the guide hole.

4. The spinous process fusion device according to any one of claims 1-3, characterized in that, The position of the movable arm assembly along the axial direction of the body is adjustable to adjust the size of the clamping cavity.

5. The spinous process fusion device according to claim 4, characterized in that, The movable arm assembly includes a sliding sleeve, a movable arm, and a rotating shaft. The sliding sleeve is disposed on the main body and its position is adjustable along the axial direction of the main body. The movable arm is disposed on the sliding sleeve. The rotating shaft passes through the movable arm and is connected to the sliding sleeve. The axial direction of the rotating shaft is orthogonal to the axial direction of the main body. The movable arm is swayable around the axial direction of the rotating shaft.

6. The spinous process fusion device according to claim 5, characterized in that, The movable arm includes a swing sleeve and two movable teeth. The swing sleeve is fitted onto the sliding sleeve, and the two movable teeth are respectively arranged on both sides of the swing sleeve. The movable teeth can rotate between an open position and a retracted position. In the retracted position, the length direction of the movable teeth is parallel to the axis of the swing sleeve, and in the open position, the length direction of the movable teeth is orthogonal to the axis of the swing sleeve. Alternatively, the movable arm includes a swing sleeve and two movable teeth. The swing sleeve is fitted onto the sliding sleeve, and the two movable teeth are respectively arranged on both sides of the swing sleeve. The movable teeth are fixed relative to the swing sleeve, and the length direction of the movable teeth is orthogonal to the axial direction of the swing sleeve. And / or, the outer wall surface of the main body is provided with a rack, the rack extends along the axial direction of the main body, and the sliding sleeve is provided with locking teeth, the locking teeth elastically engaging with the rack.

7. The spinous process fusion device according to any one of claims 1-3, wherein the main body comprises a first main body and a second main body, the second main body is disposed at one end of the first main body away from the opening arm, the first main body and the second main body are arranged coaxially, and the first main body and the second main body are detachably connected.

8. The spinous process fusion device according to claim 7, characterized in that, One of the first body and the second body is provided with a second latching protrusion, and the other body is provided with a second latching groove. The second latching protrusion is elastically engaged in the second latching groove. The second body can rotate relative to the first body so that the second latching protrusion disengages from the second latching groove.

9. The spinous process fusion device according to any one of claims 1-3, characterized in that, Both the main body and the push rod are provided with bone graft holes, and the bone graft holes are connected to the moving channel. And / or, the outer peripheral wall of the body is provided with a threaded surface, the threaded surface being adjacent to the second end of the body; And / or, the second end of the body is a pointed tip; And / or, the outer peripheral wall of the main body is provided with a clamping groove, the clamping groove being adjacent to the first end of the main body; And / or, the end of the open arm away from the body is provided with a first tooth tip.

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