Vertebral body distraction device and vertebral body distraction operation device

Abstract

The invention provides a vertebral body distraction device and a vertebral body distraction operation device. The vertebral body distraction device comprises a driving part, two threaded sleeves and a distraction assembly. The driving part comprises a first driving rod and a second driving rod which are detachably connected, threads are arranged on the first driving rod and the second driving rod, and the screwing directions of the threads on the first driving rod and the second driving rod are different; the two threaded sleeves are arranged on the first driving rod and the second driving rod in a sleeving mode correspondingly and matched with the threads. The two ends of the opening assembly are connected with the two threaded sleeves correspondingly. When the driving piece rotates around the axis of the driving piece, the first driving rod and the second driving rod rotate synchronously and drive the two threaded sleeves to be far away from each other, so that the opening assembly is opened relative to the driving piece. When the first driving rod and the second driving rod rotate, the corresponding threaded sleeves can be driven to move through threads, the opening height of the opening assembly can be determined by controlling the rotation number of the threaded sleeves relative to the threads, and accurate opening of the vertebral body opening device is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a vertebral distraction device and a vertebral distraction operation device. Background Art

[0002] When a vertebral body suffers from compression fractures due to trauma, especially when accompanied by osteoporosis, the usual treatment method is: first, a minimally invasive channel is established through a pedicle screw, then a special instrument is used to restore the original height of the vertebral body, and then bone cement is injected into the vertebral body through the minimally invasive channel to fix it. Among them, in the prior art, an unexpanded balloon is often inserted into the affected vertebral part, and the balloon is expanded by injecting a contrast agent to partially restore the height of the affected vertebra, and then the balloon is removed and bone cement is injected to stabilize the affected vertebra, but the height restoration effect is not ideal and the restored height cannot be accurately controlled. Summary of the invention

[0003] Based on this, it is necessary to provide a vertebral distraction device to address the technical problems in the prior art that the height restoration effect of special instruments is not ideal and the height restoration height cannot be accurately controlled.

[0004] A vertebral distraction device, comprising:

[0005] The driving member comprises a first driving rod and a second driving rod which are detachably connected, wherein the first driving rod and the second driving rod are both provided with threads, and the threads on the first driving rod and the second driving rod have different rotation directions;

[0006] Two threaded sleeves are respectively sleeved on the first driving rod and the second driving rod and respectively matched with the corresponding threads; and,

[0007] A spreading component is sleeved on the driving member and each of the threaded sleeves, and two ends of the spreading component are respectively connected to the two threaded sleeves;

[0008] When the driving member is configured to rotate around its own axis, the first driving rod and the second driving rod rotate synchronously and respectively drive the two threaded sleeves to move away from each other, so that the expansion assembly is expanded relative to the driving member.

[0009] In one embodiment, the pitches of the threads of the first driving rod and the second driving rod are different, so that the two ends of the expansion assembly are expanded at an angle relative to the driving member.

[0010] In one embodiment, one of the first driving rod and the second driving rod has a groove at its end, and the other has a protrusion at its end, and the protrusion is connected to the groove by threading or snapping.

[0011] In one embodiment, the expansion assembly further includes a support member and two groups of support arms, wherein the support member is located on one side of the driving member in a radial direction, and one end of the two groups of support arms are respectively connected to the two threaded sleeves, and the other end is respectively connected to the two ends of the support member;

[0012] When the two threaded sleeves move away from each other, the two groups of support arms move away from one end of the corresponding threaded sleeve toward the side away from the driving member to drive the support member away from the driving member, so that the expansion assembly is expanded relative to the driving member.

[0013] In one embodiment, the support member includes at least one support plate, each of the support plates is arranged around the circumference of the driving member, each group of the support arms includes at least two support rods arranged around the circumference of the driving member and connected to a threaded sleeve, and one end of each support plate is supported by at least two of the support rods in a group of the support arms.

[0014] In one embodiment, a first deformation groove is formed at the end of each of the spreading rods connected to the support plate, and the notch of the first deformation groove faces the driving member; and / or a second deformation groove is formed at the end of each of the spreading rods connected to the threaded sleeve, and the notch of the second deformation groove faces the side away from the driving member.

[0015] In one embodiment, the vertebral distraction device also includes two connecting seats and at least two connecting arms, the two connecting seats are respectively mounted on the relatively distant ends of the first driving rod and the second driving rod, both ends of the support member are connected to the connecting seat through a connecting arm, and each connecting arm is used to support the corresponding support member when the support member is distracted relative to the driving member.

[0016] In one embodiment, a third deformation groove is formed at the end of each connecting arm connected to the support plate, and the notch of the third deformation groove faces the driving member; and / or a fourth deformation groove is formed at the end of each connecting arm connected to the connecting seat, and the notch of the fourth deformation groove faces the side away from the driving member.

[0017] In one embodiment, the driving member is provided with an injection channel, one of the first driving rod and the second driving rod is provided with an inlet connected to the injection channel, and an outlet connected to the injection channel is provided on the outer wall of at least one of the first driving rod and the second driving rod.

[0018] In one embodiment, the vertebral body distraction device further comprises a pedicle screw connected to the distraction assembly, the pedicle screw is provided with a mounting hole, and the driving member is inserted into the mounting hole;

[0019] The vertebral distraction device also includes a first limiting member, which is passed through the pedicle screw and radially abuts against the driving member to limit the axial movement of the driving member relative to the pedicle screw; and / or the vertebral distraction device also includes a second limiting member, the hole wall of the mounting hole is provided with a first step wall and a second step wall, and the driving member is provided with a boss, when the driving member is inserted into the mounting hole, the side of the boss close to the distraction component abuts against the first step wall, and the second limiting member is blocked by the second step wall and abuts against the side of the boss facing away from the distraction component.

[0020] The present invention also provides a vertebral distraction operation device, which can solve at least one of the above technical problems.

[0021] A vertebral distraction operating device comprises an operating rod, wherein the operating rod is used to be connected to the driving member of the vertebral distraction device to drive the driving member to rotate.

[0022] Beneficial effects:

[0023] The embodiment of the present invention provides a vertebral distraction device, including a driving member, two threaded sleeves and a distraction assembly; the driving member includes a first driving rod and a second driving rod that are detachably connected, the first driving rod and the second driving rod are both provided with threads, and the threads on the first driving rod and the threads on the second driving rod have different rotation directions; the two threaded sleeves are respectively sleeved on the first driving rod and the second driving rod, and respectively cooperate with the corresponding threads; the distraction assembly is sleeved on the driving member and each threaded sleeve, and the two ends of the distraction assembly are respectively connected to the two threaded sleeves; when the driving member is configured to rotate around its own axis, the first driving rod and the second driving rod rotate synchronously, and respectively drive the two threaded sleeves to move away from each other, so that the distraction assembly is distracted relative to the driving member. In the present application, the threads on the first driving rod and the threads on the second driving rod have different rotation directions, so when the first driving rod and the second driving rod rotate, the corresponding threaded sleeves can be driven to move away from each other through the threads, and the distraction height of the two ends of the distraction assembly corresponding to the driving member can be determined by controlling the rotation number of the threaded sleeves relative to the corresponding threads, so as to achieve accurate distraction of the vertebral distraction device and improve the distraction accuracy of the vertebral distraction device.

[0024] The present invention also provides a vertebral body distraction operating device, comprising an operating rod, the operating rod is used to be connected to the driving member of the above-mentioned vertebral body distraction device to drive the driving member to rotate. The medical device can achieve at least one of the above-mentioned technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A first schematic diagram of each support plate being spread apart relative to a driving member in a vertebral body spread apart device provided in an embodiment of the present invention;

[0026] Figure 2A second schematic diagram of each support plate being spread apart relative to the driving member in the vertebral body spread apart device provided in one embodiment of the present invention;

[0027] Figure 3 A schematic diagram of a vertebral distraction device provided in one embodiment of the present invention;

[0028] Figure 4 A front view of a vertebral distraction device provided by an embodiment of the present invention;

[0029] Figure 5 A first cross-sectional view of a vertebral distraction device provided in one embodiment of the present invention;

[0030] Figure 6 A top view of a driving member in a vertebral distraction device provided in one embodiment of the present invention;

[0031] Figure 7 A cross-sectional view of a vertebral distraction device provided in an embodiment of the present invention when a first driving rod and a second driving rod are separated;

[0032] Figure 8 A cross-sectional view of a driving member in a vertebral distraction device provided in one embodiment of the present invention;

[0033] Fig. 9 A schematic diagram of a vertebral distraction device provided by an embodiment of the present invention without a driving member;

[0034] Fig.10 A second cross-sectional view of a vertebral distraction device provided in one embodiment of the present invention.

[0035] Reference numerals: 100-driving member; 110-first driving rod; 111-first thread; 112-bump; 113-first mating end; 120-second driving rod; 121-second thread; 122-groove; 123-second mating end; 130-injection channel; 131-through hole; 132-blind hole; 140-discharging port; 150-feeding port; 160-boss; 161-first side wall; 162-second side wall; 170-third driving rod; 180-limiting groove; 200-threaded sleeve; 3 00-spreading assembly; 310-support plate; 320-support arm; 321-spreading rod; 322-first deformation groove; 323-second deformation groove; 330-connecting arm; 331-third deformation groove; 332-fourth deformation groove; 340-connecting seat; 350-support member; 400-pedicle screw; 410-mounting hole; 420-first limiting member; 430-positioning hole; 440-second limiting member; 470-first step wall; 480-second step wall; 500-limiting convex; 600-operating rod. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 , Figure 1 A first schematic diagram of each support plate being spread apart relative to a driving member in a vertebral body spread apart device provided in an embodiment of the present invention; Figure 2 A second schematic diagram of each support plate being spread apart relative to the driving member in the vertebral body spread apart device provided in one embodiment of the present invention; Figure 3 A schematic diagram of a vertebral distraction device provided in one embodiment of the present invention; Figure 4 The front view of a vertebral distraction device provided by an embodiment of the present invention. The vertebral distraction device provided by an embodiment of the present invention comprises a driving member 100, two threaded sleeves 200 and a distraction assembly 300; the driving member 100 comprises a first driving rod 110 and a second driving rod 120 which are detachably connected, and the first driving rod 110 and the second driving rod 120 are both provided with threads, and the rotation directions of the threads on the first driving rod 110 and the second driving rod 120 are different; the two threaded sleeves 200 are respectively sleeved on the first driving rod 110 and the second driving rod 120, and respectively cooperate with the corresponding threads; the distraction assembly 300 is sleeved on the driving member 100 and each threaded sleeve 200, and the two ends of the distraction assembly 300 are respectively connected to the two threaded sleeves 200; when the driving member 100 is configured to rotate around its own axis, the first driving rod 110 and the second driving rod 120 rotate synchronously, and respectively drive the two threaded sleeves 200 to move away from each other, so that the distraction assembly 300 is distracted relative to the driving member 100.

[0043] Specifically, in the present application, the thread on the first drive rod 110 and the thread on the second drive rod 120 have different rotation directions. Therefore, when the first drive rod 110 and the second drive rod 120 rotate, the corresponding threaded sleeves 200 can be driven to move away from each other through the threads, and the expansion height of the two ends of the expansion assembly 300 corresponding to the driving member 100 can be determined by controlling the number of rotations of the threaded sleeves 200 relative to the corresponding threads, thereby achieving precise expansion of the vertebral expansion device and improving the expansion accuracy of the vertebral expansion device.

[0044] For the sake of distinction, the thread on the first driving rod 110 is defined as the first thread 111, the thread on the second driving rod 120 is defined as the second thread 121, and the first thread 111 is matched with the first thread 111 sleeve, and the second thread 121 sleeve is matched with the second thread 121. The end surface of the expansion assembly 300 facing away from the driving member 100 is used to support the vertebral body and is the expansion end surface.

[0045] Among them, the first driving rod 110 and the second driving rod 120 in the present application are detachably arranged, so that the first driving rod 110 and the second driving rod 120 can respectively drive the corresponding threaded sleeve 200 to move before being connected to each other, so that each threaded sleeve 200 moves to the corresponding preset position, so that after the first driving rod 110 and the second driving rod 120 are connected to each other, when the driving member 100 is rotated, the first driving rod 110 and the second driving rod 120 drive the corresponding threaded sleeve 200 to move, so that the expansion end surface of the expansion assembly 300 can be expanded at a target height, thereby improving the convenience and accuracy of the vertebral expansion device.

[0046] It should be noted that since the first thread 111 and the second thread 121 rotate in opposite directions, if the first driving rod 110 and the second driving rod 120 are a whole, when the driving member 100 extends into the two threaded sleeves 200, it is impossible for both threaded sleeves 200 to be able to move relative to the driving member 100 along the extension direction of the driving member 100, that is, one of the two threaded sleeves 200 will inevitably be unable to move to the preset position relative to the driving member 100.

[0047] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 In one embodiment, the pitches of the threads of the first driving rod 110 and the second driving rod 120 are different, so that the two ends of the expansion assembly 300 are expanded at an angle relative to the driving member 100.

[0048] Specifically, when the first driving rod 110 and the second driving rod 120 rotate, since the pitches of the threads of the first driving rod 110 and the second driving rod 120 are different, the corresponding threads drive the corresponding threaded sleeves 200 to move at different speeds, so that the expanded end surface of the expansion assembly 300 can be expanded at an angle. Figure 2 Take an example to illustrate that, in the expanded state, the distances between the two ends of the expanded end surface in the radial direction of the driving member 100 are different, so that vertebral bodies of any shapes can be accurately supported, thereby improving the adaptability of the vertebral body expansion device.

[0049] It should be noted that in the present application, the pitch of the first thread 111 and the second thread 121 can be set according to the clinical vertebral lordosis angle requirements, so that after the distraction component 300 is distracted relative to the driving member 100, the two ends of the distraction component 300 are distracted at a preset angle and preset height.

[0050] See also Figure 2 , Figure 5 , Figure 6 , Figure 7 and Figure 8 , Figure 7 A cross-sectional view of a vertebral distraction device provided in an embodiment of the present invention in which a first driving rod and a second driving rod are separated; Figure 8 A cross-sectional view of a driving member in a vertebral distraction device provided in one embodiment of the present invention. In one embodiment, a groove 122 is provided on the end of one of the first driving rod 110 and the second driving rod 120, and a protrusion 112 is provided on the end of the other, and the protrusion 112 is connected to the groove 122 by threading or snapping, so that after the threaded sleeves 200 on the first driving rod 110 and the second driving rod 120 are moved to the corresponding preset positions, the first driving rod 110 and the second driving rod 120 can be conveniently connected, and at the same time, the first driving rod 110 and the second driving rod 120 can rotate synchronously, that is, under one driving force, the two ends of the distraction assembly 300 can move to the side away from the driving member 100 at different speeds, thereby improving the distraction efficiency of the vertebral distraction device.

[0051] It should be noted that when the protrusion 112 and the groove 122 are connected by threads, the rotation direction of the driving member 100 when driving the expansion assembly 300 to expand should make the threaded connection between the first driving rod 110 and the second driving rod 120 tend to be tighter, that is, the rotation direction of the driving member 100 during the expansion operation is the same as the tightening direction of the threaded connection.

[0052] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Fig. 9 , Fig. 9 A schematic diagram of a vertebral distraction device provided in one embodiment of the present invention without the driving member. In one embodiment, the distraction assembly 300 further includes a support member 350 and two groups of support arms 320, the support member 350 is located on one side of the radial direction of the driving member 100, one end of the two groups of support arms 320 are respectively connected to the two threaded sleeves 200, and the other end is respectively connected to the two ends of the support member 350; when the two threaded sleeves 200 move away from each other, the two groups of support arms 320 move away from the corresponding threaded sleeves 200 to the side away from the driving member 100, so as to drive the support member 350 away from the driving member 100, so as to distract the distraction assembly 300 relative to the driving member 100.

[0053] Specifically, the two groups of support arms 320 are respectively connected to the opposite sides of the two threaded sleeves 200. When the driving member 100 rotates to make the first threaded sleeve 111 and the second threaded sleeve 121 relatively far away from each other, the first threaded sleeve 111 and the second threaded sleeve 121 respectively drive the corresponding support arms 320 close to the side of the driving member 100 to move away from each other. Figure 1 and Figure 4 , for example, when the first threaded sleeve 111 and the second threaded sleeve 121 are relatively far away from each other, each support arm 320 rotates relative to the driving member 100, so that the angle between the side of each support arm 320 close to the driving member 100 and the driving member 100 gradually increases, that is, each support arm 320 gradually stands up relative to the driving member 100, so that each support arm 320 drives the two ends of the support member 350 to open relative to the driving member 100.

[0054] Among them, since the two groups of support arms 320 are respectively connected to the opposite sides of the two threaded sleeves 200, the support points of the two groups of support arms 320 on the support member 350 are located at both ends of the support member 350, which is conducive to dispersing pressure, providing better support strength, making the force more balanced, and improving the reliability of the vertebral distraction device.

[0055] In other embodiments, the two groups of support arms 320 may also be connected to opposite sides of the two threaded sleeves 200 , respectively.

[0056] See also Figure 2 , Figure 3 and Figure 4 In one embodiment, the support member 350 includes at least one support plate 310, each support plate 310 is arranged around the circumference of the driving member 100, each group of support arms 320 includes at least two support rods 321 arranged around the circumference of the driving member 100 and connected to a threaded sleeve 200, and one end of each support plate 310 is supported by at least two support rods 321 in a group of support arms 320.

[0057] Specifically, the expansion end surface is located on the side of the support plate 310 away from the driving member 100. In a group of support arms 320, one end of each expansion rod 321 is connected to the corresponding support plate 310, and the other end is connected to the corresponding threaded sleeve 200. By setting at least two expansion rods 321 in a group of support arms 320, both ends of each support plate 310 are supported by at least two expansion rods 321, so that a stable supporting force can be provided to each support plate 310, the stability of the support plate 310 is improved, and the reliability of the vertebral body expansion device is improved. At the same time, since the movement of each expansion rod 321 does not interfere with each other, when there are multiple support plates 310, under the drive of the threaded sleeve 200, each expansion rod 321 located in the same group of support arms 320 can respectively drive the corresponding support plate 310 away from the driving member 100, so that each support plate 310 can be expanded relative to the driving member 100, thereby realizing multi-directional support of the vertebral body and improving the adaptability of the vertebral body expansion device.

[0058] Furthermore, there are two support plates 310, which are located on both sides of the driving member 100. Figure 4 For example, two support plates 310 are located at the upper and lower sides of the driving member 100. Under the drive of the driving member 100, the two support plates 310 can be moved away from the driving member 100 to be relatively open, thereby increasing the opening degree of the opening assembly 300, and at the same time, increasing the opening efficiency of the opening assembly 300, and improving the adaptability of the vertebral body opening device.

[0059] Furthermore, the side of the support plate 310 facing the driving member 100 is arc-shaped, so that both ends of each support plate 310 are stably supported by the corresponding at least two opening rods 321, and the thrust of the corresponding opening rods 321 is the same, so that each support plate 310 is stably opened relative to the driving member 100. The side of the support plate 310 facing away from the driving member 100 is arc-shaped, so that the opening end surface is arc-shaped, thereby reducing damage to tissue. In the embodiment, the support plate 310 can also be a flat plate.

[0060] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 In one embodiment, each spreading rod 321 is connected to the end of the support plate 310 and is provided with a first deformation groove 322, and the notch of the first deformation groove 322 faces the driving member 100, so that each spreading rod 321 is close to one end of the corresponding support plate 310, and under the drive of the threaded sleeve 200, it rotates relative to the corresponding support plate 310 away from the threaded sleeve 200, so as to facilitate the corresponding support plate 310 to be spread.

[0061] See also Figure 2 , Figure 3 and Figure 4 In one embodiment, each spreading rod 321 is connected to the end of the threaded sleeve 200 and is provided with a second deformation groove 323, and the notch of the second deformation groove 323 faces the side away from the driving member 100, so that each spreading rod 321 is close to one end of the corresponding threaded sleeve 200, and under the drive of the threaded sleeve 200, it rotates toward the other threaded sleeve 200 relative to the corresponding threaded sleeve 200, so as to facilitate the corresponding support plate 310 to be spread.

[0062] In the present application, the two ends of the support plate 310 are able to provide supporting force under the support of four expansion rods 321. At the same time, by setting the first deformation groove 322 and the second deformation groove 323 at the two ends of each expansion rod 321, the deformation point of each expansion rod 321 can be controlled, avoiding the deviation of the deformation point leading to deformity of the structure, and improving the reliability of the vertebral expansion device.

[0063] In other embodiments, the deformation structures at both ends of each spreading rod 321 can be adjusted to a hinge structure or other structures that can rotate around an axis to achieve deformation.

[0064] See also Figure 2 , Figure 3 and Figure 4 In one embodiment, the vertebral distraction device also includes two connecting seats 340 and at least two connecting arms 330. The two connecting seats 340 are respectively mounted on the relatively distant ends of the first driving rod 110 and the second driving rod 120. Both ends of the support member 350 are connected to a connecting seat 340 through a connecting arm 330. Each connecting arm 330 is used to support the corresponding support member 350 when the support member 350 is distracted relative to the driving member 100.

[0065] Specifically, in this embodiment, by providing the connecting arm 330 , the supporting points for supporting the support plate 310 are increased, so that the support plate 310 has a more superior supporting performance and the reliability of the vertebral distraction device is improved.

[0066] See also Figure 2 , Figure 3 and Figure 4In one embodiment, the connection point of each connecting arm 330 relative to the corresponding support plate 310 overlaps with the connection point of the opening rod 321 located on the same side and the support plate 310, so that when the support plate 310 is opened relative to the driving member 100, the opening rod 321 and the connecting arm 330 can rotate relative to the same position of the corresponding support plate 310, thereby reducing the interference of the connecting arm 330 on the opening of the corresponding support plate 310, so that the movement of each support plate 310 is smoother. It should be noted that the number of connecting arms 330 corresponds to the number of opening rods 321. Preferably, the number of opening rods 321 is twice the number of connecting arms 330, that is, the connection point between one end of each support plate 310 and the two opening rods 321 falls on a corresponding connecting arm 330, thereby ensuring the strength of the connecting arm 330 and improving the reliability of each connecting arm 330 supporting each support plate 310.

[0067] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 In one embodiment, each connecting arm 330 is connected to the end of the support plate 310 and is provided with a third deformation groove 331, and the notch of the third deformation groove 331 faces the driving member 100, so that each connecting arm 330 is close to one end of the corresponding support plate 310, and driven by the corresponding support plate 310, it rotates toward the side close to the threaded sleeve 200, so as to support the corresponding support plate 310 to be opened.

[0068] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 In one embodiment, a fourth deformation groove 332 is formed at the end of each connecting arm 330 connected to the connecting seat 340, and the notch of the fourth deformation groove 332 faces the side away from the driving member 100, so that each connecting arm 330 is close to one end of the corresponding connecting seat 340, and driven by the corresponding support member 350, it rotates toward the side away from the threaded sleeve 200, so as to support the corresponding support plate 310 to be opened.

[0069] In the present application, the two ends of each support plate 310 are able to provide supporting force under the support of four expansion rods 321 and four connecting arms 330. At the same time, by setting the first deformation groove 322, the second deformation groove 323, the third deformation groove 331 and the fourth deformation groove 332 on the expansion rod 321, the deformation point of each expansion rod 321 and each connecting arm 330 can be controlled, avoiding the deformation point deviation leading to structural deformity and improving the reliability of the vertebral expansion device.

[0070] In other embodiments, the deformation structures at both ends of each connecting arm 330 can be adjusted to a hinge structure or other structure that can rotate around an axis to achieve deformation.

[0071] See also Figure 5 , Figure 7 and Figure 8 In one embodiment, an injection channel 130 is provided on the driving member 100, one of the first driving rod 110 and the second driving rod 120 is provided with an inlet 150 connected to the injection channel 130, and an outlet 140 connected to the injection channel 130 is provided on the outer wall of at least one of the first driving rod 110 and the second driving rod 120.

[0072] Specifically, the feed port 150 is disposed on a side of the first driving rod 110 away from the second driving rod 120, and the first driving rod 110 and the second driving rod 120 are both provided with a discharge port 140, when injecting injection materials such as bone cement and other bone formation promoting materials from the feed port 150, the injection materials can be better released to improve the bone integration performance of the prosthesis. Preferably, the injection channel 130 extends along the extension direction of the driving member 100.

[0073] Furthermore, a through hole 131 is provided on the first driving rod 110, and a blind hole 132 is provided on the second driving rod 120. The blind hole 132 is connected to the through hole 131 to form an injection channel 130, and the feed port 150 is located on the side of the through hole 131 away from the blind hole 132. The first driving rod 110 and the second driving rod 120 are both provided with a plurality of discharge ports 140 arranged around the circumference, so as to better realize the release of the injection material. It should be noted that the caliber shape of the discharge port 140 can be circular, polygonal or other anisotropic holes.

[0074] See also Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 In one embodiment, the vertebral distraction device also includes a pedicle screw 400 connected to the distraction assembly 300, and the pedicle screw 400 is provided with a mounting hole 410, and the driving member 100 is inserted into the mounting hole 410; the vertebral distraction device also includes a first limiting member 420, the first limiting member 420 is passed through the pedicle screw 400, and radially abuts against the driving member 100 to limit the axial movement of the driving member 100 relative to the pedicle screw 400.

[0075] Specifically, the pedicle screw 400 is used to be connected to the vertebral body, and the pedicle screw 400 is connected to the connecting seat 340 near the first thread 111, and a limiting protrusion 500 is provided on the side of the pedicle screw 400 away from the distraction assembly 300. The pedicle screw 400 is provided with a positioning hole 430 connected to the mounting hole 410, and the first limiting member 420 is penetrated through the positioning hole 430 and is threadedly connected to the hole wall of the positioning hole 430, and the first limiting member 420 is abutted against the driving member 100 penetrated through the mounting hole 410. By rotating the first limiting member 420, the end of the first limiting member 420 can be pressed against the driving member 100, thereby limiting the movement of the driving member 100 relative to the pedicle screw 400.

[0076] Among them, the movement of the driving member 100 relative to the pedicle screw 400 is restricted, and the movement of the connecting seat 340 connected to the pedicle screw 400 relative to the driving member 100 is also restricted. In the process of the support plate 310 being opened relative to the driving member 100, the connecting seat 340 far away from the pedicle screw 400 is driven by the connecting arm 330 to approach the pedicle screw 400, thereby facilitating the deformation of the opening assembly 300. In addition, since the movement of the driving member 100 relative to the pedicle screw 400 is restricted, the support plate 310 will not move with the driving member 100 during the supporting process, so that each support plate 310, and the two opening rods 321 respectively connected to the two ends of the support plate 310, and the driving member 100 in the corresponding area can form a stable quadrilateral structure, so that each support can provide a stable supporting force, thereby improving the reliability of the vertebral body opening device.

[0077] In this embodiment, by changing the pitch of the first thread 111 and the second thread 121, a proportional change in the moving speed of the first thread 111 set and the second thread 121 set is achieved, thereby achieving asynchronous deformation of the corresponding support rod 321, and further achieving a front-to-back angle change at both ends of the support plate 310.

[0078] It should be noted that, since the position of the connecting seat 340 close to the pedicle screw 400 is limited, the connecting seat 340 away from the pedicle screw 400 can move relative to the driving member 100. In the process of the two threaded sleeves 200 driving the support plates 310 to move through the corresponding expansion rods 321, each support plate 310 exerts a pulling force on each expansion rod 321 away from the pedicle screw 400, so that each expansion rod 321 away from the pedicle screw 400 can deflect a certain angle relative to the pedicle screw 400, that is, when the pitch of the first thread 111 and the second thread 121 is the same, each support plate 310 as a whole will not be expanded in parallel. The specific rules are as follows:

[0079] When the pitch of the first thread 111 is twice the pitch of the second thread 121, the entirety is parallel and spread out. When the pitch of the first thread 111 is less than twice the pitch of the second thread 121, the support plates 310 after being spread out have a small spread out height at the front end and a large spread out height at the rear end, such as Figure 2 As shown; on the contrary, the front end has a larger opening height and the rear end has a smaller opening height. By changing the inclination angle, different clinical vertebral lordosis angle requirements can be met. It should be noted that the front end here refers to the side close to the pedicle screw 400, and the rear end refers to the side away from the pedicle screw 400.

[0080] In one embodiment, the connection seat 340 close to the side of the pedicle screw 400 is formed integrally with the pedicle screw 400, thereby simplifying the structure of the vertebral body distraction device and improving the adaptability of the vertebral body distraction device.

[0081] See also Figure 7 and Figure 8 In one embodiment, the driving member 100 further includes a third driving rod 170 connected to the first driving rod 110, and a limiting groove 180 is provided on the third driving rod 170. The end of the first limiting member 420 extends into the limiting groove 180 and abuts against the bottom wall of the limiting groove 180, and the first limiting member 420 abuts against the side wall of the groove, so as to stably limit the movement of the driving member 100 and the pedicle screw 400, thereby improving the reliability of the vertebral body distraction device. The first limiting member 420 is a screw. Preferably, the limiting groove 180 is arranged on the third driving rod 170 around the circumference and the entire circumference.

[0082] See also Figure 4 , Figure 8 and Fig.10 , Fig.10 A second cross-sectional view of a vertebral distraction device provided in one embodiment of the present invention. In one embodiment, the vertebral distraction device further comprises a second stopper 440, a first step wall 470 and a second step wall 480 are provided on the hole wall of the mounting hole 410, a boss 160 is provided on the driving member 100, when the driving member 100 is inserted into the mounting hole 410, a side of the boss 160 close to the distraction assembly 300 abuts against the first step wall 470, and the second stopper 440 is blocked by the second step wall 480 and abuts against a side of the boss 160 away from the distraction assembly 300.

[0083] Specifically, the side of the boss 160 close to the distraction assembly 300 is a first side wall 161, and the first side wall 161 is used to abut against the first step wall 470 to limit the movement of the driver 100 relative to the pedicle screw 400 toward the distraction assembly 300. The side of the boss 160 away from the distraction assembly 300 is a second side wall 162, and the second side wall 162 is flush with the second step wall 480 in the axial direction of the driver 100, so that the second stopper 440 is arranged on the second step wall 480, which can limit the driver 100 from moving relative to the pedicle screw 400 toward the side away from the distraction assembly 300, thereby stably limiting the relative movement of the driver 100 relative to the pedicle screw 400. Among them, the second stopper 440 is a circular ring, which is sleeved on the driver 100 and connected to the second step wall 480. Preferably, the boss 160 is arranged around the entire circumference of the driver 100.

[0084] An embodiment of the present invention further provides a vertebral distraction operating device, which includes an operating rod 600 . The operating rod 600 is used to be connected to the driving member 100 of the vertebral distraction device to drive the driving member 100 to rotate.

[0085] Specifically, the first driving rod 110 and the second driving rod 120 are provided with a first mating end 113 and a second mating end 123 on the side facing away from each other, and the operating rod 600 can be used to transmit the first mating end 113 and the second mating end 123, so as to facilitate the connection between the first driving rod 110 and the second driving rod 120, and also facilitate the rotation of the driving member 100. Compared with the prior art that requires additional operation members to be found for the first mating end 113 and the second mating end 123, the operating rod 600 in the present application can speed up the expansion efficiency of the vertebral body expansion operation device and improve the convenience of the vertebral body expansion operation device.

[0086] The first mating end 113 and the second mating end 123 may be flat or cross structures, etc. The operating rod 600 may be a wrench, etc., as long as it can realize the convenient rotation of the first driving rod 110 and the second driving rod 120 .

[0087] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 and Figure 8 An embodiment of the present invention further provides a medical device, including an operating rod 600 and the above-mentioned vertebral distraction device, wherein the operating rod 600 is used to be connected to the driving member 100 to drive the driving member 100 to rotate.

[0088] Specifically, in the present application, the thread on the first driving rod 110 and the thread on the second driving rod 120 have different rotation directions. When the first driving rod 110 and the second driving rod 120 rotate, the corresponding threaded sleeve 200 can be driven to move through the thread, thereby controlling the expansion height of the two ends of the expansion assembly 300 corresponding to the driving member 100, thereby realizing precise expansion of the vertebral expansion device and improving the adaptability of the medical device.

[0089] See also Figure 2 , Figure 3 and Figure 4 In one embodiment, the present invention further provides a vertebral support method, using the above-mentioned vertebral distraction device to perform vertebral distraction, the method comprising:

[0090] S10 determines the number of turns and pitches of the threads on the first driving rod 110 and the second driving rod 120 according to the height of the vertebral body to be expanded, so as to determine the models of the first driving rod 110 and the second driving rod 120 .

[0091] Specifically, the height of the vertebral contact surface that needs to be expanded is determined through the patient's clinical data, and the number of turns and pitch of the first thread 111 and the second thread 121 are determined, thereby determining the models of the first drive rod 110, the second drive rod 120 and the two threaded sleeves 200.

[0092] S20 rotates the first driving member 100 and the second driving rod 120 respectively, so that the two threaded sleeves 200 rotate to the corresponding preset positions on the first driving member 100 and the second driving rod 120, and connects the first driving rod 110 and the second driving rod 120, so that the first driving rod 110 and the second driving rod 120 are transmission-connected.

[0093] S30: insert the expansion assembly 300 into the patient's site, and rotate the driving rod so that the two threaded sleeves 200 drive the expansion assembly 300 to expand to a target height.

[0094] Specifically, the vertebral distraction device is inserted into the patient's site through the surgical channel with the assistance of special instruments, and the rotation of the driving member 100 is achieved by rotating a special wrench or the like, so that the first driving rod 110 and the second driving rod 120 rotate synchronously, so that the two threaded sleeves 200 move relative to each other, thereby driving the two ends of the distraction assembly 300 to be distracted relative to the driving member 100, so that the distraction assembly 300 is distracted to the target height.

[0095] 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.

[0096] 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. A vertebral distraction device, characterized in that: The vertebral body distraction device comprises: A driving member (100) comprises a first driving rod (110) and a second driving rod (120) which are detachably connected, wherein the first driving rod (110) and the second driving rod (120) are both provided with threads, and the threads on the first driving rod (110) and the second driving rod (120) have different rotation directions; Two threaded sleeves (200) are respectively sleeved on the first driving rod (110) and the second driving rod (120) and respectively matched with the corresponding threads; and, A spreading component (300) is sleeved on the driving member (100) and each of the threaded sleeves (200), and two ends of the spreading component (300) are respectively connected to the two threaded sleeves (200); When the driving member (100) is configured to rotate around its own axis, the first driving rod (110) and the second driving rod (120) rotate synchronously and respectively drive the two threaded sleeves (200) to move away from each other, so that the expansion assembly (300) is expanded relative to the driving member (100).

2. The vertebral distraction device according to claim 1, characterized in that: The pitches of the threads of the first driving rod (110) and the second driving rod (120) are different, so that the two ends of the expansion assembly (300) are expanded at an angle relative to the driving member (100).

3. The vertebral distraction device according to claim 1, characterized in that: A groove (122) is provided at the end of one of the first driving rod (110) and the second driving rod (120), and a protrusion (112) is provided at the end of the other, and the protrusion (112) is connected to the groove (122) by threading or snapping.

4. The vertebral distraction device according to any one of claims 1 to 3, characterized in that: The expansion assembly (300) further comprises a support member (350) and two groups of support arms (320), wherein the support member (350) is located on one side of the driving member (100) in a radial direction, and one end of the two groups of support arms (320) are respectively connected to the two threaded sleeves (200), and the other end is respectively connected to two ends of the support member (350); When the two threaded sleeves (200) move away from each other, one end of the two groups of support arms (320) away from the corresponding threaded sleeves (200) moves toward a side away from the driving member (100), thereby driving the support member (350) to move away from the driving member (100), so that the expansion assembly (300) is expanded relative to the driving member (100).

5. The vertebral distraction device according to claim 4, characterized in that: The support member (350) comprises at least one support plate (310), each of the support plates (310) being arranged circumferentially around the driving member (100), each group of the support arms (320) comprising at least two support rods (321) being arranged circumferentially around the driving member (100) and connected to a threaded sleeve (200), and one end of each of the support plates (310) is supported by at least two of the support rods (321) in a group of the support arms (320).

6. The vertebral distraction device according to claim 5, characterized in that: The end of each of the support rods (321) connected to the support plate (310) is provided with a first deformation groove (322), and the notch of the first deformation groove (322) faces the driving member (100); and / or the end of each of the support rods (321) connected to the threaded sleeve (200) is provided with a second deformation groove (323), and the notch of the second deformation groove (323) faces the side away from the driving member (100).

7. The vertebral distraction device according to claim 4, characterized in that: The vertebral distraction device also includes two connecting seats (340) and at least two connecting arms (330), the two connecting seats (340) are respectively mounted on the relatively distant ends of the first driving rod (110) and the second driving rod (120), both ends of the support member (350) are connected to a connecting seat (340) through a connecting arm (330), and each connecting arm (330) is used to support the corresponding support member (350) when the support member (350) is distracted relative to the driving member (100).

8. The vertebral distraction device according to claim 7, characterized in that: A third deformation groove (331) is formed at the end of each connecting arm (330) connected to the support plate (310), and the notch of the third deformation groove (331) faces the driving member (100); and / or a fourth deformation groove (332) is formed at the end of each connecting arm (330) connected to the connecting seat (340), and the notch of the fourth deformation groove (332) faces the side away from the driving member (100).

9. The vertebral distraction device according to any one of claims 1 to 3, characterized in that: The driving member (100) is provided with an injection channel (130), one of the first driving rod (110) and the second driving rod (120) is provided with an inlet (150) connected to the injection channel (130), and an outlet (140) connected to the injection channel (130) is provided on the outer wall of at least one of the first driving rod (110) and the second driving rod (120).

10. The vertebral distraction device according to any one of claims 1 to 3, characterized in that: The vertebral body distraction device further comprises a pedicle screw (400) connected to the distraction assembly (300), a mounting hole (410) is provided in the pedicle screw (400), and the driving member (100) is inserted into the mounting hole (410); The vertebral body distraction device further comprises a first stopper (420), the first stopper (420) being inserted into the pedicle screw (400) and radially abutting against the driving member (100) to limit the axial movement of the driving member (100) relative to the pedicle screw (400); and / or the vertebral body distraction device further comprises a second stopper (440), the hole wall of the mounting hole (410) being provided with a first step wall (470) and a second step wall (470). The step wall (480) is provided with a boss (160) on the driving member (100). When the driving member (100) is inserted into the mounting hole (410), the side of the boss (160) close to the support assembly (300) abuts against the first step wall (470), and the second limiting member (440) is blocked by the second step wall (480) and abuts against the side of the boss (160) facing away from the support assembly (300).

11. A vertebral body distraction operation device, characterized in that: The vertebral distraction operating device comprises an operating rod (600), and the operating rod (600) is used to be connected to the driving member (100) of the vertebral distraction device according to any one of claims 1 to 10 to drive the driving member (100) to rotate.

Images