Intervertebral fusion device

Abstract

The invention relates to an interbody fusion device. The device comprises a supporting assembly, a driving piece and two sets of opening mechanisms. The supporting assembly comprises two supporting pieces arranged in the intervertebral height direction at intervals, and each supporting piece is provided with a first supporting end and a second supporting end. The driving piece is arranged between the two supporting pieces; the distraction mechanism comprises two distraction assemblies in transmission connection with the driving part, the two ends of the two distraction assemblies are rotationally connected with the two first supporting ends correspondingly, and the two ends of the other two distraction assemblies are rotationally connected with the two second supporting ends correspondingly; when the driving piece is operated, the distraction assemblies are distraction in the intervertebral height direction. The two groups of distraction assemblies connected with the first supporting end and the corresponding part of the transmission piece form a triangular structure, the two groups of distraction assemblies connected with the second supporting end and the corresponding part of the transmission piece form a triangular structure, and the two ends of the two supporting pieces are supported. And the two ends of the two supporting pieces can be stably supported.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an intervertebral fusion device. Background Art

[0002] Spinal fusion devices are used for degenerative instability of the lumbar spine due to various reasons, such as herniated disc, spinal stenosis, or lumbar spondylolisthesis due to various reasons. Currently, expandable spinal fusion devices are commonly used. The expandable spinal fusion device is first implanted into the spinal incision through surgery, and then the slide rod support structure is driven to expand to support the spine to the target height. However, when the upper and lower support end surfaces of the expandable spinal fusion device are under pressure, they are mainly supported by the slide rod support structure. The slide rod support structure may move during the continuous force process, thereby causing the height of the spinal fusion device to decrease, affecting the patient. Summary of the invention

[0003] Based on this, it is necessary to provide an intervertebral fusion device to address the technical problem that when the upper and lower supporting end surfaces of the expandable spinal fusion device are compressed, the sliding rod support structure may move during the continuous force process, thereby causing the height of the spinal fusion device to be reduced and affecting the patient.

[0004] An intervertebral fusion device, comprising:

[0005] A support assembly, comprising two support members, the two support members are arranged at intervals along the intervertebral height direction, and the support members have a first support end and a second support end arranged at intervals;

[0006] A driving member, the driving member is arranged between the two supporting members;

[0007] Two groups of spreading mechanisms, each of which includes two groups of spreading components, and all four groups of spreading components are drivingly connected to the driving member, wherein two ends of the two groups of spreading components are respectively rotatably connected to the first supporting ends of the two supporting members, and the other two ends of the other two groups of spreading components are respectively rotatably connected to the second supporting ends of the two supporting members;

[0008] Each of the distraction assemblies is configured to distract along the intervertebral height direction when the driving member is operated, so that the two support members are distracted to a preset position.

[0009] In one embodiment, the driving member includes a driving shaft, the two supporting members are respectively located on both sides of the driving shaft in the radial direction, and the two ends of the driving shaft are respectively provided with a first thread corresponding to the first supporting end and a second thread corresponding to the second supporting end, the first thread includes a first section and a second section with opposite rotation directions, the second thread includes a third section and a fourth section with opposite rotation directions, the second section and the third section are located between the first section and the fourth section, and the first section and the third section have the same rotation direction;

[0010] The two groups of the spreading components connected to the first support end are respectively threadedly matched with the first section and the second section, and the two groups of the spreading components connected to the second support end are respectively threadedly matched with the third section and the fourth section.

[0011] The driving shaft is configured to drive the four groups of the expansion components to move when rotating around its own axis, so that the two groups of the expansion components corresponding to the first support end are relatively close to each other, and the two groups of the expansion components corresponding to the second support end are relatively close to each other, so as to drive the two support members to move away from the driving shaft.

[0012] In one embodiment, the first section and the second section have the same pitch, and the lengths of the two groups of the expansion components corresponding to the first support end are the same; the third section and the fourth section have the same pitch, and the lengths of the two groups of the expansion components corresponding to the second support end are the same.

[0013] In one embodiment, the expansion assembly includes a driving block and two groups of connecting rods, the driving block is threadedly mounted on the driving shaft, one end of the two groups of connecting rods are rotatably connected to the driving block, and the other end is rotatably connected to the first support end or the second support end of the two support members; when the driving shaft drives each of the expansion assemblies to expand, each group of the connecting rods rotates from the side away from the corresponding driving block to the side away from the driving shaft, so as to drive the two support members to move away from the driving shaft.

[0014] In one embodiment, the first supporting end and the second supporting end of each of the supporting members are provided with two connecting rods spaced apart along a first direction, and each group of the connecting rods includes two supporting rods, and one end of the two supporting rods in each group of the connecting rods is rotatably connected to the two connecting rods at the first supporting end or the second supporting end, respectively, and the other end is rotatably connected to the corresponding driving block, wherein the first direction is perpendicular to the axial direction of the driving shaft and perpendicular to the arrangement direction of the two supporting members.

[0015] In one embodiment, the rotation axes of the four support rods rotatably connected to the connecting rod at the same support end are collinear.

[0016] In one embodiment, each of the driving blocks along both sides of the first direction is provided with two connecting parts spaced apart along the intervertebral height direction, each connecting part is used for rotationally connecting with one end of the corresponding support rod, and the axes of the four connecting parts are coplanar, and the plane is perpendicular to the axial direction of the driving shaft.

[0017] In one embodiment, the length of the connecting rod corresponding to the first thread is greater than the length of the connecting rod corresponding to the second thread; and / or,

[0018] The pitch of the first thread is greater than the pitch of the second thread.

[0019] In one embodiment, the intervertebral fusion device further comprises a locking member, wherein the locking member is sleeved on the driving shaft and threadedly connected to the driving shaft, and the locking member is used to prevent the driving shaft from rotating around its own axis.

[0020] In one embodiment, the two support members are provided with an arc surface for guiding on the same side along the axial direction of the driving member, and the bending direction of the arc surface is the direction in which the two support members face each other.

[0021] Beneficial effects:

[0022] The intervertebral fusion device provided in an embodiment of the present invention includes a support assembly, a driving member and two groups of distraction mechanisms; the support assembly includes two support members, the two support members are arranged at intervals along the intervertebral height direction, and the support members have a first support end and a second support end arranged at intervals; the driving member is arranged between the two support members; each distraction mechanism includes two groups of distraction assemblies, and the four groups of distraction assemblies are all transmission-connected to the driving member, wherein the two ends of the two groups of distraction assemblies are respectively rotatably connected to the first support ends of the two support members, and the other two ends of the other two groups of distraction assemblies are respectively rotatably connected to the second support ends of the two support members; each distraction assembly is configured to distract along the intervertebral height direction when the driving member is operated, so that the two support members are distracted to a preset position. In the present application, the two ends of the two expansion components are rotatably connected to the first support ends of the two support members, and the two ends of the other two expansion components are rotatably connected to the second support ends of the two support members, so that the two expansion components connected to the first support ends and part of the transmission parts between the two expansion components form a triangular structure, and the two expansion components connected to the second support ends and part of the transmission parts between the two expansion components form two triangular structures, thereby supporting the two ends of the two support members. Since the triangle is the most stable and not easy to deform, the two ends of the two support members can be stably supported, thereby improving the stability of the intervertebral fusion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1This is a schematic diagram of an intervertebral fusion device provided by an embodiment of the present invention when expanded.

[0024] Figure 2 A schematic diagram of an intervertebral fusion device provided in one embodiment of the present invention.

[0025] Figure 3 A schematic diagram of a driving member in an intervertebral fusion device provided in an embodiment of the present invention.

[0026] Figure 4 A schematic diagram of a distraction mechanism in an intervertebral fusion device provided in one embodiment of the present invention.

[0027] Figure 5 A schematic diagram of a distraction assembly in an intervertebral fusion device provided in one embodiment of the present invention.

[0028] Figure 6 A schematic diagram of a driving block in an intervertebral fusion device provided in an embodiment of the present invention.

[0029] Figure Number:

[0030] 100-driving shaft; 110-first thread; 111-first section; 112-second section; 120-second thread; 121-third section; 122-fourth section; 130-locking member; 140-matching end; 200-opening mechanism; 210-opening assembly; 220-driving block; 221-connecting part; 222-connecting hole; 230-connecting rod; 240-support rod; 241-first support rod; 242-second support rod; 243-third support rod; 244-fourth support rod; 250-fastener; 300-support assembly; 310-support member; 311-connecting rod; 312-connecting plate; 320-arc surface; 330-teeth. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0037] See also Figure 1 and Figure 2 , Figure 1 A schematic diagram of an intervertebral fusion device provided by an embodiment of the present invention when expanded; Figure 2 A schematic diagram of an intervertebral fusion device provided in one embodiment of the present invention. An intervertebral fusion device provided in one embodiment of the present invention comprises a support assembly 300, a driving member and two groups of distraction mechanisms 200; the support assembly 300 comprises two support members 310, the two support members 310 are arranged at intervals along the intervertebral height direction, and the support members 310 have a first support end and a second support end arranged at intervals; the driving member is arranged between the two support members 310; each distraction mechanism 200 comprises two groups of distraction assemblies 210, and the four groups of distraction assemblies 210 are all connected to the driving member in a transmission manner, wherein the two ends of the two groups of distraction assemblies 210 are respectively connected to the first support ends of the two support members 310 in a rotational manner, and the two ends of the other two groups of distraction assemblies 210 are respectively connected to the second support ends of the two support members 310 in a rotational manner; each distraction assembly 210 is configured to be distracted along the intervertebral height direction when the driving member is operated, so that the two support members 310 are distracted to a preset position.

[0038] Specifically, in the present application, the two ends of the two groups of expansion components 210 are rotatably connected to the first support ends of the two support members 310, and the two ends of the other two groups of expansion components 210 are rotatably connected to the second support ends of the two support members 310, so that the two groups of expansion components 210 connected to the first support ends and some transmission parts between the two groups of expansion components 210 form a triangular structure, and the two groups of expansion components 210 connected to the second support ends and some transmission parts between the two groups of expansion components 210 form a triangular structure, thereby supporting the two ends of the two support members 310. Since the triangle is the most stable and not easy to deform, the two ends of the two support members 310 can be stably supported, thereby improving the stability of the intervertebral fusion device.

[0039] See also Figure 1 , Figure 2 and Figure 3 , Figure 3A schematic diagram of a driving member in an intervertebral fusion device provided in an embodiment of the present invention. In one embodiment, the driving member includes a driving shaft 100, two supporting members 310 are respectively located on both sides of the driving shaft 100 in a radial direction, and both ends of the driving shaft 100 are respectively provided with a first thread 110 corresponding to the first supporting end and a second thread 120 corresponding to the second supporting end, the first thread 110 includes a first section 111 and a second section 112 with opposite rotation directions, the second thread 120 includes a third section 121 and a fourth section 122 with opposite rotation directions, the second section 112 and the third section 121 are located between the first section 111 and the fourth section 122, and the first section 111 and the third section 122 are respectively provided with a first thread 110 corresponding to the first supporting end and a second thread 120 corresponding to the second supporting end, the first thread 110 includes a first section 111 and a second section 112 with opposite rotation directions, the second section 112 and the third section 121 are located between the first section 111 and the fourth section 122, and the first section 111 and the third section 122 are respectively provided with a first thread 110 corresponding to the first supporting end and the second thread 120 corresponding to the second supporting end. 21 has the same rotation direction; the two groups of expansion components 210 connected to the first support end are respectively threadedly matched with the first section 111 and the second section 112, and the two groups of expansion components 210 connected to the second support end are respectively threadedly matched with the third section 121 and the fourth section 122. When the drive shaft 100 is configured to rotate around its own axis, it can drive the four groups of expansion components 210 to move, so that the two groups of expansion components 210 corresponding to the first support end are relatively close to each other, and the two groups of expansion components 210 corresponding to the second support end are relatively close to each other, so as to drive the two support members 310 to move away from the drive shaft 100 relative to the drive shaft 100.

[0040] Specifically, each support member 310 extends in the axial direction of the drive shaft 100, and the first support end and the second support end are spaced apart in the axial direction of the drive shaft 100. In the present application, one end of the two groups of spreading components 210 corresponding to the first section 111 and the second section 112 are both connected to the first support end, and one end of the two groups of spreading components 210 corresponding to the third section 121 and the fourth section 122 are both connected to the second support end. Since the first section 111 and the second section 112 have opposite rotation directions, the third section 121 and the fourth section 122 have opposite rotation directions, and the first section 111 and the third section 121 have the same rotation direction, in the process of controlling the rotation of the drive shaft 100, the two groups of spreading components 210 corresponding to the first section 111 and the second section 112 can be driven to approach each other to be folded, and the two groups of spreading components 210 corresponding to the third section 121 and the fourth section 122 can be driven to approach each other to be folded, so as to achieve support for the support member 310. At the same time, in the initial state, the two groups of expansion components 210 corresponding to the first section 111 and the second section 112 and the ends of the drive shaft 100 are far away from each other, and the two groups of expansion components 210 corresponding to the third section 121 and the fourth section 122 and the ends of the drive shaft 100 are far away from each other, so that the part of the expansion component 210 used to support each support member 310 can be as close to one side of the drive shaft 100 as possible, thereby reducing the height between the two support members 310, facilitating the insertion of the intervertebral fusion device into the intervertebral space, and improving the adaptability of the intervertebral fusion device.

[0041] It should be noted that, in the process of controlling the drive shaft 100 to rotate in the opposite direction, the two groups of expansion components 210 corresponding to the first section 111 and the second section 112 can be driven away from each other, and the two groups of expansion components 210 corresponding to the third section 121 and the fourth section 122 can be driven away from each other, thereby realizing the contraction of the support member 310.

[0042] In addition, the two groups of expansion components 210 connected to the first support end and the driving shaft 100 between the two groups of expansion components 210 form a triangular structure, and the two groups of expansion components 210 connected to the second support end and the driving shaft 100 between the two groups of expansion components 210 form a triangular structure. Since each expansion component 210 is threadedly connected to the driving shaft 100, the axial position of the expansion component 210 and the driving shaft 100 is not easy to move. Therefore, when the driving shaft 100 does not rotate, the side length of each triangular structure is constant, and it is not easy to deform. Both ends of the two support members 310 are stably supported, thereby improving the stability and reliability of the intervertebral fusion device.

[0043] See also Figure 1 , Figure 2 and Figure 3 In one embodiment, the first section 111 and the second section 112 have the same pitch, and the lengths of the two groups of expansion components 210 corresponding to the first support end are the same; the third section 121 and the fourth section 122 have the same pitch, and the lengths of the two groups of expansion components 210 corresponding to the second support end are the same.

[0044] Specifically, since the pitch of the first section 111 and the second section 112 are the same and the lengths of the two groups of expansion components 210 corresponding to the first support end are the same, when the two groups of expansion components 210 support the first support end, the two groups of expansion components 210 have the same inclination angle relative to the drive shaft 100, so that the two groups of expansion components 210 corresponding to the first support end generate axial thrusts on the drive shaft 100 of the same magnitude and opposite directions, thereby being able to offset each other. Similarly, it can be understood that the two groups of expansion components 210 corresponding to the second support end generate axial thrusts on the drive shaft 100 of the same magnitude and opposite directions, thereby being able to offset each other, thereby reducing the axial movement of the drive shaft 100 relative to the support member 310, so that each triangular structure can stably support the two support members 310.

[0045] In other embodiments, the pitch of the first section 111 and the second section 112 may be different, and the pitch of the third section 121 and the fourth section 122 may be the same or different, as long as it is ensured that under the drive of the drive shaft 100, the four groups of expansion components 210 can stably expand the two support members 310.

[0046] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 4 A schematic diagram of a distraction mechanism in an intervertebral fusion device provided in one embodiment of the present invention. In one embodiment, the distraction assembly 210 includes a driving block 220 and two sets of connecting rods 230, the driving block 220 is threadedly sleeved on the driving shaft 100, one end of the two sets of connecting rods 230 are both rotatably connected to the driving block 220, and the other ends are respectively rotatably connected to the first support end or the second support end of the two support members 310; when the driving shaft 100 drives each distraction assembly 210 to distract, each set of connecting rods 230 moves away from the side of the corresponding driving block 220 and rotates toward the side away from the driving shaft 100, so as to drive the two support members 310 to move away from the driving shaft 100.

[0047] Specifically, in the initial state, one end of each group of connecting rods 230 close to the support member 310 abuts against the drive shaft 100 and is in a contracted state, so that the height between the two support members 310 is the lowest, that is, the size of the intervertebral fusion device is the smallest. When the drive shaft 100 is controlled to rotate, the corresponding two driving blocks 220 approach each other, so that under the push of the driving blocks 220, one end of each group of connecting rods 230 connected to the support member 310 can rotate relative to the corresponding support member 310 and move away from the drive shaft 100 to open the corresponding support member 310, thereby increasing the height between the two support members 310 to support the vertebral body.

[0048] It should be noted that the two groups of connecting rods 230 corresponding to the first supporting end of one supporting member 310 and the drive shaft 100 between the two groups of connecting rods 230 form a triangular structure to support the supporting member 310. The two groups of connecting rods 230 corresponding to the first supporting end of another supporting member 310 and the drive shaft 100 between the two groups of connecting rods 230 form a triangular structure to support the supporting member 310.

[0049] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , Figure 5 A schematic diagram of a distraction assembly in an intervertebral fusion device provided in one embodiment of the present invention. In one embodiment, the first support end and the second support end of each support member 310 are provided with two connecting rods 311 spaced apart along a first direction, each group of connecting rods 230 includes two supporting rods 240, one end of the two supporting rods 240 in a group of connecting rods 230 is rotatably connected to the two connecting rods 311 at the first support end or the second support end, respectively, and the other end is rotatably connected to the corresponding driving block 220, wherein the first direction is perpendicular to the axial direction of the driving shaft 100 and perpendicular to the arrangement direction of the two supporting members 310.

[0050] Specifically, one end of two support rods 240 in a set of connecting rods 230 is respectively connected to the two connecting rods 311 of the first supporting end or the second supporting end, and the other end is connected to the corresponding driving block 220, so that each support member 310 has two supporting points in the first direction, and each support member 310 also has two supporting points at the first supporting end and the second supporting end in the axial direction of the driving shaft 100, so that each support member 310 has four supporting points on the plane perpendicular to the intervertebral height, so that it is stably supported, and the stability of each support member 310 when supporting the vertebral body is improved. Among them, the two support rods 240 connected to the same connecting rod 311 and the driving shaft 100 between the two support rods 240 form a triangle to support the corresponding support member 310.

[0051] Furthermore, two connecting plates 312 spaced apart along the first direction are convexly provided on opposite sides of each support member 310, and two connecting rods 311 corresponding to the first supporting end of a support member 310 are respectively connected to opposite sides of the two connecting plates 312. In this embodiment, by providing the connecting plates 312, a certain gap is provided between each connecting rod 311 and the corresponding support member 310, thereby reducing the interference caused by the rotation of each support rod 240 relative to the support member 310.

[0052] It should be noted that the instructions are attached Figure 1 For example, the intervertebral height direction is along the XX' direction, the axial direction of the driving member is the ZZ' direction, the first direction is the YY' direction, and the intervertebral height direction, the axial direction of the driving shaft 100 and the first direction are perpendicular to each other. The following description is based on the intervertebral height direction, the axial direction of the driving shaft 100 and the first direction.

[0053] Among them, for the sake of easy distinction, the support rod 240 corresponding to the first section 111 is defined as the first support rod 241, the support rod 240 corresponding to the second section 112 is defined as the second support rod 242, the support rod 240 corresponding to the third section 121 is defined as the third support rod 243, and the support rod 240 corresponding to the fourth section 122 is defined as the fourth support rod 244.

[0054] See also Figure 1 and Figure 4 In one embodiment, the rotation axes of the four support rods 240 rotatably connected to the connecting rod 311 at the same support end are collinear.

[0055] Specifically, in the axial direction of the drive shaft 100, the two support rods 240 connected to the same connecting rod 311 are parallel, so that when the two support rods 240 connected to the same connecting rod 311 are relatively close to support the support member 310 to be opened, they can avoid each other without interference, thereby improving the smoothness of the support member 310 when being opened. The rotation axes of the four support rods 240 corresponding to the first supporting end of a support member 310 are all coincident, and the rotation axes of the four support rods 240 corresponding to the second supporting end of a support member 310 are all coincident, so that when each driving block 220 moves relative to the drive shaft 100, each support rod 240 rotates synchronously with the corresponding first supporting end or second supporting end, thereby improving the smoothness of the support member 310 when being opened.

[0056] In one embodiment, the two first struts 241 corresponding to the first thread 110 are located inside the two second struts 242 , and the two fourth struts 244 corresponding to the second thread 120 are located inside the two third struts 243 .

[0057] Furthermore, the rotation axis of each support rod 240 is parallel to the first direction, and in the process of the driving block 220 driving each support member 310 to rotate, each support rod 240 rotates on a first plane perpendicular to the first direction, so that the two support rods 240 connected to the same connecting rod 311 and the triangular plane formed by the driving shaft 100 between the two support rods 240 are perpendicular to the first direction. When each support rod 240 is continuously subjected to force, since the direction of the force is always on the first plane, it is possible to reduce interference with the stability of the triangle, thereby improving the stability of each support member 310.

[0058] See also Figure 1 , Figure 2 and Figure 4 In one embodiment, the distraction mechanism 200 further includes four fasteners 250, each fastener 250 is passed through two support rods 240 connected to the same connecting rod 311, and connected to the connecting rod 311, thereby preventing each support rod 240 from falling out of the corresponding connecting rod 311, thereby improving the reliability of the intervertebral fusion device. Preferably, the fasteners 250 are rivets.

[0059] See also Figure 1 , Figure 4 and Figure 6 , Figure 6 A schematic diagram of a driving block in an intervertebral fusion device provided in one embodiment of the present invention. In one embodiment, each driving block 220 is provided with two connecting portions 221 spaced apart along the intervertebral height direction on each side along the first direction, each connecting portion 221 is used for rotationally connecting with one end of a corresponding support rod 240, and the axes of the four connecting portions 221 are coplanar, and the plane is perpendicular to the axial direction of the driving shaft 100.

[0060] Specifically, a connection hole 222 that matches the drive shaft 100 is provided in the middle of each driving block 220, and the four support rods 240 included in the same group of spreading components 210 have the same length. Since the axes of the four connecting parts 221 are coplanar with the second plane perpendicular to the axial direction of the drive shaft 100, the component forces received by each driving block 220 on the first plane can offset each other, and the forces received in the first direction are the same, so that the driving block 220 will not deflect relative to the drive shaft 100, thereby improving the stability of each driving block 220. The provision of the connecting part 221 can reduce the interference of the driving block 220 on the rotation of the corresponding support rod 240.

[0061] See also Figure 1 , Figure 3 and Figure 4 In one embodiment, the length of the connecting rod 230 corresponding to the first thread 110 is greater than the length of the connecting rod 230 corresponding to the second thread 120 .

[0062] Specifically, the lengths of the support rods 240 of the spreading mechanism 200 corresponding to the first thread 110 are the same, and the lengths of the support rods 240 of the spreading mechanism 200 corresponding to the second thread 120 are the same. The length of the support rod 240 corresponding to the first thread 110 is greater than the length of the support rod 240 corresponding to the second thread 120, that is, the lengths of the first support rod 241 and the second support rod 242 are the same, the lengths of the third support rod 243 and the fourth support rod 244 are the same, and the lengths of the first support rod 241 and the second support rod 242 are greater than the lengths of the third support rod 243 and the fourth support rod 244.

[0063] In the process of the drive shaft 100 driving the four expansion components 210 to move, assuming that the pitch of the first thread 110 is equal to the pitch of the second thread 120, the rotation angle of the first support rod 241 and the second support rod 242 is the same as the rotation angle of the third support rod 243 and the fourth support rod 244, so that the expansion height of the first support rod 241 and the second support rod 242 is greater than the expansion height of the third support rod 243 and the fourth support rod 244, so that the first support end of the two support members 310 is higher than the second support end, so that the support members 310 are expanded at an angle, so that by designing the length of each support rod 240, it is possible to support any shape of vertebrae, thereby improving the adaptability of the vertebral expansion device. It should be noted that the positions of the first thread 110 and the second thread 120 can be interchanged.

[0064] See also Figure 1 , Figure 3 and Figure 4In one embodiment, the pitch of the first thread 110 is greater than the pitch of the second thread 120. Specifically, if the length of the support rod 240 corresponding to the first thread 110 is equal to the length of the support rod 240 corresponding to the second thread 120, in the process of the drive rod driving the four distraction components 210 to move, since the pitch of the first thread 110 is greater than the pitch of the second thread 120, the rotation angle of the first support rod 240 and the second support rod 240 relative to the drive shaft 100 is greater than the rotation angle of the third support rod 240 and the fourth support rod 240, so that the distraction height of the first support rod 240 and the second support rod 240 is greater than the distraction height of the third support rod 240 and the fourth support rod 240, so that the first support ends of the two support members 310 are higher than the second support ends, so that the support members 310 are distracted at an angle, so that by designing the pitch ratio of the first thread 110 and the second thread 120, it is possible to support any vertebral body, thereby improving the adaptability of the vertebral distraction device. It should be noted that the positions of the first thread 110 and the second thread 120 can be swapped.

[0065] In other embodiments, the pitch of the first thread 110 is greater than the pitch of the second thread 120 , and the length of the connecting rod 230 corresponding to the first thread 110 is greater than the length of the connecting rod 230 corresponding to the second thread 120 .

[0066] See also Figure 1 , Figure 2 and Figure 3 In one embodiment, the intervertebral fusion device further includes a locking member 130. The locking member 130 is sleeved on the driving shaft 100 and threadedly connected to the driving shaft 100. The locking member 130 is used to prevent the driving shaft 100 from rotating around its own axis.

[0067] Specifically, when the intervertebral fusion device is inserted into the intervertebral space, the side of the drive shaft 100 located at the insertion end is threadedly connected to the locking member 130. When the two support members 310 are stretched to a preset height in the intervertebral space, the locking member 130 abuts against the driving block 220 on the side close to the insertion end, thereby limiting the rotation of the drive shaft 100 and the driving block 220 on the side close to the insertion end, so as to limit the rotation of the drive shaft 100, so that the rotation angle between each support rod 240 and the driving rod remains unchanged during the continuous force process, so that the height between the two support members 310 remains unchanged, thereby improving the stability and reliability of the intervertebral fusion device. Preferably, the locking member 130 is a nut.

[0068] Furthermore, a mating end 140 threadably mating with the locking member 130 is provided on one side of the drive shaft 100 close to the insertion end, and a step wall is provided between the mating end 140 and the drive shaft 100 so as to abut against the locking member 130 to position the locking member 130 .

[0069] See also Figure 5 In one embodiment, teeth 330 are provided on the opposite side of the support member 310, so as to increase the friction with the vertebral body and reduce the relative sliding between the support member 310 and the vertebral body.

[0070] See also Figure 1 , Figure 2 and Figure 5 In one embodiment, the two support members 310 are provided with an arc surface 320 for guiding on the same side along the axial direction of the driving member, and the bending direction of the arc surface 320 is the direction in which the two support members 310 face each other.

[0071] Specifically, the arc surface 320 is disposed on a side of the support member 310 away from the insertion end, so that when the intervertebral fusion device is inserted into the intervertebral space, it can play a guiding role and facilitate the insertion.

[0072] See also Figure 1 , Figure 2 and Figure 3 The embodiment of the present invention further provides a medical device, including an operating rod and the above-mentioned intervertebral fusion device, wherein the operating rod is used to cooperate with the driving shaft 100 to drive the driving shaft 100 to rotate. The operating rod is a common tool such as a wrench.

[0073] In the present application, the two ends of the two groups of expansion components 210 are rotatably connected to the first support ends of the two support members 310, and the two ends of the other two groups of expansion components 210 are rotatably connected to the second support ends of the two support members 310, so that the two groups of expansion components 210 connected to the first support ends and some transmission parts between the two groups of expansion components 210 form a triangular structure, and the two groups of expansion components 210 connected to the second support ends and some transmission parts between the two groups of expansion components 210 form two triangular structures, thereby supporting the two ends of the two support members 310. Since the triangle is the most stable and not easy to deform, the two ends of the two support members 310 can be stably supported, thereby improving the stability and reliability of the medical equipment.

[0074] See also Figure 1 , Figure 2 and Figure 3 The embodiment of the present invention further provides a vertebral support method, including using the above-mentioned intervertebral fusion device to perform vertebral distraction, the method comprising:

[0075] According to the height and angle of the vertebral body to be expanded, the length of each support member 310 and the pitch of the first thread 110 and the second thread 120 on the drive shaft 100 are determined;

[0076] Install the four expansion assemblies 210 at corresponding installation positions of the drive shaft 100;

[0077] The intervertebral fusion device is inserted into the target position, and the driving shaft 100 is rotated so that the four distraction assemblies 210 drive the two distraction members to distract to the target height and target angle.

[0078] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An intervertebral fusion device, characterized in that: The intervertebral fusion device comprises: A support assembly (300) comprises two support members (310), wherein the two support members (310) are arranged at intervals along the intervertebral height direction, and the support members (310) have a first support end and a second support end arranged at intervals; a driving member, the driving member being arranged between the two supporting members (310); Two groups of spreading mechanisms (200), each of the spreading mechanisms (200) comprising two groups of spreading components (210), the four groups of spreading components (210) being all in transmission connection with the driving member, wherein two ends of the two groups of spreading components (210) are respectively rotatably connected to the first supporting ends of the two supporting members (310), and the other two ends of the other two groups of spreading components (210) are respectively rotatably connected to the second supporting ends of the two supporting members (310); Each of the distraction assemblies (210) is configured to distract along the intervertebral height direction when the driving member is operated, so that the two support members (310) are distracted to a preset position.

2. The intervertebral fusion device according to claim 1, characterized in that: The driving member comprises a driving shaft (100), the two supporting members (310) are respectively located on both sides of the driving shaft (100) in a radial direction, and the two ends of the driving shaft (100) are respectively provided with a first thread (110) corresponding to the first supporting end and a second thread (120) corresponding to the second supporting end, the first thread (110) comprises a first section (111) and a second section (112) of opposite rotation directions, the second thread (120) comprises a third section (121) and a fourth section (122) of opposite rotation directions, the second section (112) and the third section (121) are located between the first section (111) and the fourth section (122), and the first section (111) and the third section (121) have the same rotation direction; The two groups of the spreading components (210) connected to the first supporting end are respectively threadedly matched with the first section (111) and the second section (112); the two groups of the spreading components (210) connected to the second supporting end are respectively threadedly matched with the third section (121) and the fourth section (122); The driving shaft (100) is configured to drive the four groups of the spreading components (210) to move when rotating around its own axis, so that the two groups of the spreading components (210) corresponding to the first support end are relatively close to each other, and the two groups of the spreading components (210) corresponding to the second support end are relatively close to each other, so as to drive the two support members (310) to move away from the driving shaft (100).

3. The intervertebral fusion device according to claim 2, characterized in that: The first section (111) and the second section (112) have the same pitch, and the lengths of the two groups of the expansion components (210) corresponding to the first support end are the same; the third section (121) and the fourth section (122) have the same pitch, and the lengths of the two groups of the expansion components (210) corresponding to the second support end are the same.

4. The intervertebral fusion device according to claim 2, characterized in that: The expansion assembly (210) comprises a driving block (220) and two groups of connecting rods (230), wherein the driving block (220) is threadedly sleeved on the driving shaft (100), and one end of the two groups of connecting rods (230) are both rotatably connected to the driving block (220), and the other ends are respectively rotatably connected to the first supporting end or the second supporting end of the two supporting members (310); when the driving shaft (100) drives each of the expansion assemblies (210) to expand, the side of each group of connecting rods (230) away from the corresponding driving block (220) rotates toward the side away from the driving shaft (100), so as to drive the two supporting members (310) to move away from the driving shaft (100).

5. The intervertebral fusion device according to claim 4, characterized in that: The first supporting end and the second supporting end of each supporting member (310) are each provided with two connecting rods (311) spaced apart along a first direction, and each group of connecting rods (230) includes two supporting rods (240), and one end of the two supporting rods (240) in each group of connecting rods (230) is rotatably connected to the two connecting rods (311) at the first supporting end or the second supporting end, respectively, and the other end is rotatably connected to the corresponding driving block (220), wherein the first direction is perpendicular to the axial direction of the driving shaft (100) and perpendicular to the arrangement direction of the two supporting members (310).

6. The intervertebral fusion device according to claim 5, characterized in that: The rotation axes of the four support rods (240) rotatably connected to the connecting rod (311) at the same support end are collinear.

7. The intervertebral fusion device according to claim 5, characterized in that: Each of the driving blocks (220) is provided with two connecting parts (221) spaced apart along the intervertebral height direction on each side of the first direction, and each connecting part (221) is used for rotationally connecting with one end of the corresponding support rod (240), and the rotation axes of the four connecting parts (221) are coplanar, and the plane is perpendicular to the axial direction of the driving shaft (100).

8. The intervertebral fusion device according to claim 4, characterized in that: The length of the connecting rod (230) corresponding to the first thread (110) is greater than the length of the connecting rod (230) corresponding to the second thread (120); and / or, The pitch of the first thread (110) is greater than the pitch of the second thread (120).

9. The intervertebral fusion device according to any one of claims 2 to 8, characterized in that: The intervertebral fusion device further comprises a locking member (130), wherein the locking member (130) is sleeved on the driving shaft (100) and threadedly connected to the driving shaft (100), and the locking member (130) is used to prevent the driving shaft (100) from rotating around its own axis.

10. The intervertebral fusion device according to any one of claims 2 to 8, characterized in that: The two support members (310) are both provided with an arc surface (320) for guiding on the same side along the axial direction of the driving member, and the bending direction of the arc surface is the direction in which the two support members (310) face each other.

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