Distraction device capable of implanting bone cement and distraction system

Abstract

The invention relates to a distraction device capable of implanting bone cement and a distraction system.The distraction device comprises a main body, a distraction body and a driving mechanism, the main body is provided with a mounting groove penetrating in the radial direction, and the interior of the main body is connected with a bone cement feeding channel; the distraction body is arranged in the mounting groove in a distraction mode, the distraction body comprises a first wall and two second walls, and bone cement discharging holes are formed in the first wall and / or the second walls; the driving mechanism is used for driving the distraction body to move relative to the main body, so that the distraction device is switched between the folded state and the distraction state. According to the scheme, the first opening facing the far end is defined in the distraction device in the distraction state, the bone cement discharging holes formed in the radial direction are matched, the distribution of injected bone cement in the circumferential direction of the distraction device is optimized, the filling amount of the bone cement at the far end is guaranteed, the mechanical supporting effect after the bone cement is solidified is improved, and the mechanical supporting effect is improved. The post-operation centrum strengthening effect is enhanced, and the risks of post-operation fracture and the like of a patient are reduced.

Description

Technical Field

[0001] This invention relates to the field of vertebral body expansion devices, and in particular to an implantable bone cement expansion device and expansion system. Background Technology

[0002] In the prior art, the bone cement outlet hole is opened at a position perpendicular to its length direction of the spreading device, or the bone cement outlet hole is opened radially along the middle guide rod, which makes the dispersion direction of bone cement uncontrollable. Especially at the front end of the spreading device, it is easy to cause a small amount of bone cement distribution at the front end, resulting in uneven filling of bone cement. Summary of the Invention

[0003] Based on this, an implantable bone cement-supporting device and a support system are provided to solve the problem of insufficient bone cement distribution at the front end of the support device in the prior art.

[0004] On one hand, the present invention provides a support device for implantable bone cement, the support device comprising: The main body has a radially penetrating mounting groove, and the interior of the main body is connected to a bone cement inlet channel; The expandable body is expandably installed in the mounting groove. The expandable body includes a first wall and two second walls. The opposite sides of the first wall are respectively connected to the two second walls. The first wall and / or the second wall are provided with bone cement discharge holes. The drive mechanism is used to drive the expansion body to move relative to the main body, so that the expansion device can switch between the closed state and the expanded state. When closed, the expander is housed within the mounting slot; In the extended state, at least a portion of the extended body extends out of the mounting groove and forms a U-shaped structure, wherein the first wall is the bottom of the U-shaped structure and the second wall is the side wall of the U-shaped structure; the first wall, the two second walls and the inner wall of the mounting groove together form a bone cement channel, and the bone cement channel forms a first opening facing the distal end; the bone cement outlet and the bone cement channel are both connected to the bone cement inlet channel.

[0005] Based on the above technical solution, the present invention can be further improved as follows.

[0006] In one implementation, there are two supporting bodies, which are arranged radially symmetrically within the mounting groove.

[0007] In one implementation, in the extended state, the first wall extends fully out of the mounting groove, at least a portion of the second wall extends out of the mounting groove, and the bone cement channel also forms a second opening facing the proximal end.

[0008] In one implementation, the extended state includes a parallel extended state in which the extended body extends parallel to the mounting groove, and an inclined extended state in which the extended body extends obliquely to the mounting groove. In the parallel open state, the opening area of ​​the first opening is equal to the opening area of ​​the second opening; When tilted and open, the opening area of ​​the first opening is larger than the opening area of ​​the second opening.

[0009] In one implementation, the drive mechanism includes: The slide groove and the slider are respectively set on the main body and on each supporting body, and the slider is movably set in the slide groove; The pusher is axially movable and is disposed in the expansion device. It has a protruding locking block and the expansion body is provided with a strip-shaped locking groove that cooperates with the locking block. The locking block is accommodated in the locking groove so that the expansion body can move radially relative to the pusher when it moves axially with the pusher. Threaded sleeve, connected to the proximal end of the pusher component via a threaded connection; The pusher is configured to move axially as the threaded sleeve rotates, thereby pushing the spreader to move toward the distal end while simultaneously spreading radially.

[0010] In one implementation, there are two blocks, which are arranged radially symmetrically on both sides of the pusher; the slot is opened on the second wall.

[0011] In one of the implementation methods, The slide is provided on the inner wall of the mounting groove, and a slider is provided at the proximal end and the distal end of each second wall; The chute includes: The first slide groove has multiple slide grooves and is respectively located at the proximal and distal ends corresponding to the two sliders on the second wall. The angle between the extension direction of the first slide groove and the axial direction is an acute angle. Each second wall is engaged with the corresponding two first slide grooves through two sliders. The second groove has its proximal end connected to the distal end of the first groove located at the proximal end, and extends in a direction parallel to the axial direction. The third chute has its proximal end connected to the distal end of the first chute located at the distal end, and extends along a length direction parallel to the first chute. In the parallel extended state, the sliders are all set in the first groove; In the tilted and open state, the distance between the far end of the third slide groove and the axis is greater than the distance between the second slide groove and the axis. The slider located at the near end on the second wall is set in the second slide groove, and the slider located at the far end on the first wall is set in the third slide groove.

[0012] In one implementation, in the closed state, the expander is housed in the mounting groove, and the outer surface of the first wall and the outer wall of the main body together form a cylindrical surface.

[0013] In one implementation, bone cement discharge holes are provided on both the first wall and the two second walls.

[0014] On the other hand, the present invention also provides a expandable system, including an expandable device into which bone cement can be implanted, and further comprising: An implantation tool is used to switch the opening device from a closed state to an open state.

[0015] The beneficial effects of this invention are as follows: In the expanded state, this solution forms a first opening facing the distal end on the expanded device, which, together with the radially arranged bone cement outlet hole, allows the bone cement to simultaneously fill the distal end and radial direction of the expanded device, improving the dispersion and uniformity of the bone cement during filling, thus ensuring the amount of bone cement filling at the distal end. Compared with the prior art, which only discharges bone cement radially, this solution optimizes the distribution of injected bone cement in the circumferential direction of the expanded device, ensuring the amount of bone cement filling at the distal end, improving the mechanical support effect after the bone cement has solidified, enhancing the postoperative vertebral body strengthening effect, and reducing the risk of postoperative refracture in patients. Attached Figure Description

[0016] Figure 1 This is a partial structural schematic diagram of the spreading device in one embodiment; Figure 2 This is a schematic diagram of the structure of the spreading device in the closed state in one embodiment; Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at point AA; Figure 4 for Figure 3 Enlarged structural diagram at point B; Figure 5 In the parallel extended state of the extended body and with Figure 3 A schematic diagram of the structure cut along the same location; Figure 6 In the tilted and open state of the expander and with Figure 3 A schematic diagram of the structure cut along the same location; Figure 7 This is a schematic diagram of a partial structure of the implant; Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure at point CC; Figure 9 This is a schematic diagram of a partial structure of the body that expands outwards in one embodiment; Figure 10 This is a schematic diagram of a partial structure of the body that expands outwards in another embodiment; Figure 11 This is a schematic diagram of a self-tapping, expandable system for a vertebra in one embodiment. Figure 12 This is a schematic diagram of a self-tapping, expandable system for a vertebra in another embodiment; Figure 13 for Figure 12 Schematic diagram of the cross-sectional structure at point DD; Figure 14 for Figure 13 A magnified schematic diagram of the structure at point E in the middle.

[0017] In the attached diagram, the components represented by each number are as follows: 1. Spreading device; 11. Main body; 111. Mounting slot; 112. Inner layer; 113. Outer layer; 12. Support body; 121. First wall; 122. Second wall; 123. Bone cement discharge hole; 124. First opening; 125. Second opening; 126. Bone cement inlet channel; 127. Slot; 13. Drive mechanism; 131. Slide groove; 1311. First slide groove; 1312. Second slide groove; 1313. Third slide groove; 132. Slider; 134. Pusher; 1341. Locking block; 135. Threaded sleeve; 2. Implantation tools. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit its scope. It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the invention. Therefore, the drawings only show components relevant to the invention and are not drawn according to the actual number, shape, and size of the components. In actual implementation, the form, quantity, and proportion of each component can be arbitrarily changed, and the component layout may be more complex. The structures, proportions, sizes, etc., depicted in the accompanying drawings are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which the invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed in this invention.

[0019] A bone cement-implantable expansion device 1, see [link to previous document]. Figure 1 and Figure 11The opening device 1 includes a main body 11, an opening body 12, and a drive mechanism 13. The main body 11 has a radially penetrating mounting groove 111, and a bone cement inlet channel 126 is connected inside the main body 11. The opening body 12 is openably disposed in the mounting groove 111. The opening body 12 includes a first wall 121 and two second walls 122. The opposite sides of the first wall 121 are respectively connected to the two second walls 122. Bone cement outlet holes 123 are opened on the first wall 121 and / or the second wall 122. The drive mechanism 13 is used to drive the opening body 12 to move relative to the main body 11, so that the opening device 1 switches between a closed state and an open state. In the closed state, the expander 12 is housed within the mounting slot 111; In the extended state, at least a portion of the extended body 12 extends out of the mounting groove 111 and forms a U-shaped structure, wherein the first wall 121 is the bottom of the U-shaped structure and the second wall is the side wall of the U-shaped structure; the first wall 121, the two second walls 122 and the inner wall of the mounting groove 111 together form a bone cement channel, and the bone cement channel forms a first opening 124 facing the distal end; the bone cement discharge hole 123 and the bone cement channel are both connected to the bone cement inlet channel 126.

[0020] In this scheme, under the expanded state, a first opening 124 is formed on the expanding device 1 with its opening facing the distal end. This, combined with the radially arranged bone cement discharge hole 123, allows the bone cement to simultaneously fill the distal end and radial direction of the expanding device 1. This improves the dispersion and uniformity of the bone cement during filling, ensuring the amount of bone cement filling at the distal end. Compared to the existing technology that only discharges bone cement radially, this scheme optimizes the circumferential distribution of the injected bone cement in the expanding device 1, ensuring the amount of bone cement filling at the distal end, improving the mechanical support effect after the bone cement has solidified, enhancing the postoperative vertebral body strengthening effect, and reducing the risk of postoperative refracture in patients.

[0021] Specifically, since the support body 12 is housed in the mounting groove 111, it is known that the main body 11 has a cavity inside; the mounting groove 111 that is radially through the main body 11 can be understood as the mounting groove 111 penetrating one side wall of the main body 11, or penetrating two side walls of the main body in the radial direction; the number of mounting grooves 111 penetrating the side walls of the main body 11 corresponds to the number of support bodies 12.

[0022] Specifically, the supporting body 12 has a U-shaped structure, and the cross-sectional structure of the supporting body 12 is U-shaped. The distribution of the first wall and the second wall of the supporting body 12 does not have to completely follow the U-shaped structure.

[0023] In some embodiments, see Figure 1The two second walls 122 are connected to the two opposite sides of the first wall 121. In this way, the first wall 121 and the second wall 122 are connected as a whole, so that when the drive mechanism 13 pushes the supporting body 12, it can push the supporting body 12 as a whole, without setting up a separate drive mechanism 13 to drive the second wall 122 and the first wall 121 separately.

[0024] In some embodiments, see Figure 1 There are two supporting bodies 12, which are radially symmetrically arranged in two mounting grooves 111. This leads to the design of having two supporting bodies 12, meaning that the supporting bodies 12 can be opened in two opposite directions to be fixed in the cone body; correspondingly, the mounting grooves 111 penetrate the two side walls at both ends of the main body along the same diameter direction, so that the two supporting bodies 12 can be radially symmetrically arranged in the two mounting grooves 111.

[0025] In some embodiments, see Figure 1 , Figure 5 and Figure 6 In the extended state, the first wall 121 extends fully out of the mounting groove 111, at least a portion of the second wall 122 extends out of the mounting groove 111, and the bone cement channel also forms a second opening 125 facing the proximal end. Thus, in the expanded state, the first wall 121 fully extends out of the mounting groove 111, thereby forming a bone cement channel with a second opening 125 facing the proximal end, in addition to the first opening 124. Corresponding bone cement outlets are provided at both the proximal and distal ends, namely the first opening 124 and the second opening 125, so that bone cement has outlets at both the proximal and distal ends of the expanded body 12, which is conducive to the bone cement fully filling the proximal and distal ends of the expanded body 12. The bone cement discharge hole 123 provided on the first wall 121 and / or the second wall 122 of the expanded body 12 allows the bone cement to be discharged along the circumference of the expanded body 12, which is conducive to the bone cement fully filling the circumferential direction of the expanded body 12. In summary, the coordinated arrangement of the bone cement discharge hole 123, the first opening 124 and the second opening 125 is conducive to improving the uniformity of bone cement diffusion throughout the entire circumference of the expanded device 1.

[0026] In some embodiments, see Figure 5 and Figure 6 The extended state includes a parallel extended state where the extending body 12 extends parallel to the mounting groove 111, and an inclined extended state where the extending body 12 extends obliquely to the mounting groove 111; see also Figure 5 In the parallel extended state, the opening area of ​​the first opening 124 is equal to the opening area of ​​the second opening 125; see also Figure 6In the inclined open state, the opening area of ​​the first opening 124 is larger than the opening area of ​​the second opening 125. This leads to the two open states of the open body 12. The choice between the parallel open state and the inclined open state can be made according to the requirements.

[0027] In the embodiments, see Figure 6 In the tilted expansion state, the distal opening is larger than the proximal opening, that is, the opening area of ​​the first opening 124 is larger than the opening area of ​​the second opening 125. In the vertebral body, the distal expansion angle is larger than the proximal angle. This expansion method can more effectively pull the posterior ligament structure, thereby more fully expanding the area of ​​the spinal canal and nerve root canal. Compared with parallel expansion, it can achieve more effective indirect decompression and provide more space for the nerve root.

[0028] In some embodiments, the drive mechanism 13 includes a groove 131, a slider 132, a pusher 134, and a threaded sleeve 135; see also Figure 4-6 One of the slide groove 131 and the slider 132 is disposed on the main body 11, and the other is disposed on each of the supporting bodies 12. The slider 132 is movably disposed within the slide groove 131; see also Figures 13-14 The pusher 134 is axially movable within the spreading device 1. The pusher 134 has a protruding locking block 1341. The spreading body 12 has a strip-shaped locking groove 127 that cooperates with the locking block 1341. The locking block 1341 is accommodated in the locking groove 127, so that the spreading body 12 can move radially relative to the pusher 134 when it moves axially with the pusher. The threaded sleeve 135 is threadedly connected to the proximal end of the pusher 134. The pusher 134 is configured to move axially when the threaded sleeve 135 rotates, so as to push the spreading body 12 to move toward the distal end while spreading radially. Thus, by pushing the slider 132 within the groove 131, the pusher 134 moves the slider 132, causing the threaded sleeve 135 to rotate, which in turn drives the pusher 134 to move axially, thereby pushing the expansion body 12 to move. Through the cooperative structure of the groove 131 and the slider 132 of the expansion body 12, the expansion body 12 moves simultaneously radially and axially. The corresponding movement method is that when the threaded sleeve 135 is rotated under force, the main body 11 must be restricted from rotating. Since the pusher 134 is threadedly connected to the threaded sleeve 135 but the pusher 134 cannot rotate (the pusher 134 cannot rotate, which is essentially due to the main body 11 not being able to rotate, and the main body 11 not being able to rotate, which makes the expansion body 12 not being able to rotate, and the expansion body 12 and the pusher 134 not being able to rotate relative to each other), the pusher 134 will move axially, that is, the pusher 134 will move towards the far end to drive the locking block 1341 to move within the locking groove 127, thereby driving the expansion body 12 to move towards the far end while simultaneously expanding radially.

[0029] In one implementation, there are two locking blocks 1341, which are symmetrically arranged radially on both sides of the pusher 134; slots 127 are formed on the second wall 122. Thus, the number of locking blocks 1341 is the same as the number of expanding bodies 12. The two locking blocks 1341 are respectively used to engage with the slots 127 of the two expanding bodies 12 to push the expanding bodies 12 open, and to create a structure in which the expanding bodies 12 and the pusher 134 rotate synchronously. The slots 127 are arranged radially along their length.

[0030] Specifically, the locking block 1341 can be in the form of a cross structure. The cross structure has two first protrusions arranged along a first direction and extending in opposite directions, and two second protrusions arranged along a second direction and extending in opposite directions. The first protrusions and the second protrusions are arranged in mutually perpendicular directions. The two first protrusions are respectively locked into the corresponding slots 127 of the second wall 122, and the two second protrusions are arranged between the two second walls 122 to improve the structural stability of the entire locking block 1341.

[0031] In some embodiments, see Figures 4-6 A sliding groove 131 is disposed on the inner wall of the mounting groove 111. Each second wall 122 has a slider 132 at its proximal and distal ends. The sliding groove 131 includes a first sliding groove 1311, a second sliding groove 1312, and a third sliding groove 1313. Multiple first sliding grooves 1311 are respectively disposed at their proximal and distal ends corresponding to the two sliders 132 on the second wall 122. The angle between the extension direction of the first sliding groove 1311 and the axial direction is acute. Each second wall 122 engages with two corresponding first sliding grooves 1311 via two sliders 132. The proximal end of the second sliding groove 1312 communicates with the distal end of the first sliding groove 1311 located at its proximal end. The second slide groove 1312 extends in a direction parallel to the axial direction; the proximal end of the third slide groove 1313 communicates with the distal end of the first slide groove 1311 located at the distal end, and the third slide groove 1313 extends in a length direction parallel to the first slide groove 1311; wherein, in the parallel open state, the sliders 132 are all disposed within the first slide groove 1311; in the inclined open state, the distance between the distal end of the third slide groove 1313 and the axis is greater than the distance between the second slide groove 1312 and the axis, the sliders 132 located at the proximal end on the second wall 122 are disposed within the second slide groove 1312, and the sliders 132 located at the distal end on the first wall 121 are disposed within the third slide groove 1313. In this way, three slide groove 131 structures are introduced, clarifying the connection methods corresponding to the inclined open state and the parallel open state; the sliders 132 slide within the three slide grooves 131, and the corresponding sliders 132 move to different slide grooves 131 to switch between the parallel open state and the inclined open state.

[0032] In the embodiments, see Figures 4-6Each second wall 122 is provided with a proximal slider 132 and a distal slider 132; the inner wall of the main body 11 is provided with a proximal slide groove 131 and a distal slide groove 131; the proximal slide groove 131 includes a first slide groove 1311 and a second slide groove 1312 connected together, the proximal end of the second slide groove 1312 is connected to the distal end of the first slide groove 1311 located at the proximal end, the extension direction of the first slide groove 1311 makes an acute angle with the axial direction, and the second slide groove 1312 is parallel to the axial direction. The distal slide 131 extends in the direction of the first slide 1311; the distal slide 131 includes a connected second slide 1312 and a third slide 1313, the proximal end of the third slide 1313 communicates with the distal end of the first slide 1311 located at the distal end, the angle between the extension direction of the first slide 1311 and the axial direction is an acute angle, and the third slide 1313 extends along a length direction parallel to the first slide 1311; the proximal slider 132 slides within the proximal slide 131, and the distal slider 132 slides within the distal slide 131. Figure 8 Each main body 11 has two proximal sliding grooves 131 and two distal sliding grooves 131 on one side of its inner wall, which correspond to and match the sliders 132 on the two second walls 122 of the two supporting bodies 12 on that side. The two proximal sliding grooves 131 are partially connected, and the two distal sliding grooves 131 are also partially connected. The direction of the sliders 132 in the sliding grooves 131 can be referred to Figures 4 to 5 .

[0033] In the embodiments, see Figure 9 and Figure 10 The slider 132 is disposed on the second wall 122. The sliders 132 disposed on the same side of different supporting bodies 12 are staggered and are provided on the corresponding second wall 122, so that the sliders 132 on the second wall 122 of the two supporting bodies 12 can be engaged with the slide groove 131 on the main body 11.

[0034] In some embodiments, see Figures 11-13 In the closed state, see Figure 2 The expander 12 is housed in the mounting groove 111, and the outer surface of the first wall 121 and the outer wall of the main body 11 together form a cylindrical surface. In this way, in the closed state, the outer wall of the expander 1 is an easily penetrated cylindrical surface, so as to facilitate insertion into the cone body.

[0035] In some embodiments, see Figure 9 and Figure 10 The first wall 121 and the two second walls 122 are each provided with bone cement outlet holes 123. This arrangement of bone cement outlet holes 123 on both the first wall 121 and the two second walls 122 results in a wider distribution range of the bone cement outlet holes 123 and an increased number of corresponding angles, which facilitates more uniform dispersion of bone cement within the vertebral body. The bone cement outlet holes 123 are evenly distributed.

[0036] An expandable system, see Figure 11 It includes a bone cement implantable expansion device 1 and an implantation tool 2 for switching the expansion device 1 from a closed state to an expanded state. In this way, the implantation tool 2 assists in expanding the expansion device 1 within the vertebral body.

[0037] In this embodiment, after the expansion device 1 is inserted into the vertebral body, the implantation tool 2 can engage with the threaded sleeve 135 to form a synchronously rotatable structure, such as a hexagonal inner hole engagement method. The implantation tool 2 drives the threaded sleeve 135 to rotate, thereby driving the pusher 134, which is threadedly connected to the threaded sleeve 135 but cannot rotate, to move axially toward the distal end. The pusher 134 drives the locking block 1341 to move in the locking groove 127, thereby driving the expansion body 12 to move toward the distal end and simultaneously expand radially. After expanding to the set position, bone cement is introduced into the vertebral body through the bone cement inlet channel 126 provided in the expansion device 1 and the bone cement inlet channel 126 provided in the middle of the implantation tool 2. When in the inclined expansion state, the bone cement is simultaneously discharged from the expansion device 1 along the first opening 124, the second opening 125 and the bone cement outlet hole 123.

[0038] See Figure 9 and Figure 10 For the non-rotatable connection structure formed by the supporting body 12 and the pushing member 134, the supporting body 12 is provided with a slot 127, and the pushing member 134 is provided with a locking block 1341. The locking block 1341 is engaged in the slot 127, so that the supporting body 12 and the pushing member 134 can only rotate synchronously and cannot rotate relative to each other. Furthermore, see... Figure 1 The supporting body 12 cannot rotate relative to the main body 11. The supporting body 12 can only move a certain distance relative to the main body 11 in the radial and axial directions when it is opened. It can be inferred that the supporting body 12 and the main body 11 can only rotate synchronously and cannot rotate relative to each other.

[0039] In the embodiments, see Figure 6 and Figure 7 The main body 11 is divided into an inner layer 112 and an outer layer 113, which are nested together to form the main body 11.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. In this invention, unless otherwise explicitly specified and limited, the terms "installed," "connected," "joined," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0042] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An implantable bone cement-supporting device, characterized in that, The spreading device (1) includes: The main body (11) has a radially penetrating mounting groove (111), and the main body (11) is connected to a bone cement inlet channel (126). A support body (12) is provided in the mounting groove (111) in a expandable manner. The support body (12) includes a first wall (121) and two second walls (122). The opposite sides of the first wall (121) are respectively connected to the two second walls (122). Bone cement discharge holes (123) are provided on the first wall (121) and / or the second wall (122). The driving mechanism (13) is used to drive the expansion body (12) to move relative to the main body (11), so that the expansion device (1) switches between the closed state and the expanded state; In the closed state, the expansion body (12) is housed within the mounting groove (111); In the extended state, at least a portion of the extending body (12) extends out of the mounting groove (111) and forms a U-shaped structure, wherein the first wall (121) is the bottom of the U-shaped structure and the second wall (122) is the side wall of the U-shaped structure; the first wall (121), the two second walls (122) and the inner wall of the mounting groove (111) together form a bone cement channel, and the bone cement channel forms a first opening (124) facing the distal end; the bone cement discharge hole (123) and the bone cement channel are both connected to the bone cement inlet channel (126).

2. The implantable bone cement-supporting device according to claim 1, characterized in that, There are two supporting bodies (12), and the two supporting bodies (12) are radially symmetrically arranged in the mounting groove (111).

3. The implantable bone cement-supporting device according to claim 1, characterized in that, In the extended state, the first wall (121) extends fully out of the mounting groove (111), at least a portion of the second wall (122) extends out of the mounting groove (111), and the bone cement channel also forms a second opening (125) facing the proximal end.

4. The implantable bone cement-supporting device according to claim 3, characterized in that, The spread-out state includes a parallel spread-out state in which the spread-out body (12) extends parallel to the mounting groove (111), and an inclined spread-out state in which the spread-out body (12) extends obliquely to the mounting groove (111). In the parallel open state, the opening area of ​​the first opening (124) is equal to the opening area of ​​the second opening (125); In the tilted open state, the opening area of ​​the first opening (124) is greater than the opening area of ​​the second opening (125).

5. The implantable bone cement-supporting device according to claim 4, characterized in that, The drive mechanism (13) includes: A groove (131) and a slider (132) are provided, one on the main body (11) and the other on each of the supporting bodies (12), and the slider (132) is movably provided in the groove (131); The pusher (134) is axially movable and is disposed in the opening device (1). It is provided with a protruding locking block (1341). The opening body (12) is provided with a strip-shaped locking groove (127) that cooperates with the locking block (1341). The locking block (1341) is accommodated in the locking groove (127), so that the opening body (12) can move radially relative to the pusher (134) when it moves axially with the pusher (134). A threaded sleeve (135) is threaded to the proximal end of the pusher (134); The pusher (134) is configured to move axially as the threaded sleeve (135) rotates, thereby pushing the spreader (12) toward the distal end while spreading it radially.

6. The implantable bone cement-supporting device according to claim 5, characterized in that, There are two card blocks (1341), which are arranged radially symmetrically on both sides of the pusher (134); the card slot (127) is opened on the second wall (122).

7. The implantable bone cement-supporting device according to claim 6, characterized in that, The slide groove (131) is disposed on the inner wall of the mounting groove (111), and each of the second walls (122) has a slider (132) disposed at its proximal and distal ends respectively. The groove (131) includes: The first groove (1311) has multiple grooves and is respectively disposed at the proximal and distal ends of the two sliders (132) on the second wall (122). The angle between the extension direction of the first groove (1311) and the axial direction is an acute angle. Each second wall (122) is engaged with the corresponding two first grooves (1311) through two sliders (132). The second groove (1312) has its proximal end connected to the distal end of the first groove (1311) located at the proximal end, and extends in a direction parallel to the axial direction. The third groove (1313) has its proximal end connected to the distal end of the first groove (1311) located at the distal end, and extends along a length direction parallel to the first groove (1311). In the parallel extended state, the sliders (132) are all disposed within the first groove (1311); In the tilted open state, the distance between the distal end of the third slide groove (1313) and the axis is greater than the distance between the second slide groove (1312) and the axis. The slider (132) located at the proximal end on the second wall (122) is disposed in the second slide groove (1312), and the slider (132) located at the distal end on the first wall (121) is disposed in the third slide groove (1313).

8. The implantable bone cement-supporting device according to claim 1, characterized in that, In the closed state, the expansion body (12) is housed in the mounting groove (111), and the outer surface of the first wall (121) and the outer wall of the main body (11) together form a cylindrical surface.

9. The implantable bone cement-supporting device according to claim 1, characterized in that, The bone cement discharge hole (123) is provided on the first wall (121) and the two second walls (122).

10. An expandable system, characterized in that, The device comprising the implantable bone cement-supporting device as described in any one of claims 1-9 further comprises: An implantation tool (2) is used to drive the opening device (1) to switch from the closed state to the opening state.

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