阅读说明：本技术 椎体成形支架 (Vertebral body forming support ) 是由 李�杰 孙灿 姚瑶 李俊菲 葛亮 于 2021-08-26 设计创作，主要内容包括：本发明涉及一种椎体成形支架,包括主轴杆、支撑部及牵引部,支撑部设置于主轴杆的远端且被配置为与主轴杆相对运动时径向张开或径向合拢,所述支撑部包括支撑板,当支撑部呈张开状态时支撑板被配置为用于支撑椎体,牵引部连接主轴杆和支撑部,用于控制支撑部沿主轴杆径向合拢或径向张开。以未张开的形态通过推送杆送入椎体腔内,到达指定位置后,推送杆带动主轴杆运动,支撑部相对于主轴杆的远端向近端运动时径向张开,支撑部呈张开状态时支撑板被配置为用于撑开椎体腔,能够对椎体腔起到更好的支撑。如果高度不合适,可以反方向作用推送杆,支撑部随之合拢,通过调整主轴杆正向或反向运动,进而调整支撑部张开的角度,完成高度的调节。(The invention relates to a vertebral body forming support which comprises a main shaft rod, a support part and a traction part, wherein the support part is arranged at the far end of the main shaft rod and is configured to be radially opened or radially closed when moving relative to the main shaft rod, the support part comprises a support plate, the support plate is configured to be used for supporting a vertebral body when the support part is in an opened state, and the traction part is connected with the main shaft rod and the support part and is used for controlling the support part to be radially closed or radially opened along the main shaft rod. The support part radially opens relative to the far end of the main shaft rod when moving towards the near end, and the support plate is configured to be used for opening the vertebral body cavity when the support part is in the opening state, so that the vertebral body cavity can be better supported. If the height is not proper, the pushing rod can be acted in the opposite direction, the supporting part is folded along with the pushing rod, and the opening angle of the supporting part is adjusted by adjusting the forward or reverse movement of the main shaft rod, so that the height is adjusted.)

1. A vertebroplasty stent, comprising:

a main shaft rod;

the supporting part is arranged at the far end of the main shaft rod and is configured to be radially opened or radially closed when the supporting part moves relative to the main shaft rod, and the supporting part comprises a supporting plate which is configured to be used for supporting a vertebral body when the supporting part is in the opened state;

and the traction part is connected with the main shaft rod and the supporting part and is used for controlling the supporting part to be folded or unfolded along the radial direction of the main shaft rod.

2. The vertebroplasty stent of claim 1, wherein the surface of the main shaft is provided with external threads; the traction part comprises a connecting piece, a traction rod and a gear, the connecting piece is sleeved at the near end of the main shaft rod and is configured to rotate relative to the main shaft rod, the near end of the traction rod is fixed on the connecting piece, the gear is rotatably arranged at the far end of the traction rod and meshed with the external thread, and the gear is connected with the supporting part and drives the supporting part to rotate.

3. The vertebroplasty support of claim 2, wherein the support portion further comprises a support arm, one end of the support arm is fixed to the gear and the other end of the support arm is fixed to the support plate, the other end of the support plate being a free end.

4. The vertebroplasty stent of claim 3, wherein the support plate comprises a connecting section and a support surface, wherein one end of the connecting section is fixed to the other end of the support arm, and the support surface is at least partially parallel to the main shaft or axial direction when the support portion is in the expanded state.

5. The vertebroplasty stent of claim 4, wherein the support surface is an outwardly convex circular arc surface; or

The support surface is a streamline support surface, and the middle of the streamline support surface is low and the two sides are high.

6. A vertebroplasty support according to claim 3, wherein one gear corresponds to two draw bars and two support arms, the two draw bars are spaced apart in parallel, the two support arms are located on opposite sides of the gear, respectively, and each support arm is located between the draw bar and the gear.

7. The vertebroplasty stent of claim 1, wherein the proximal end of the main shaft is provided with a fitting structure for mating with a push rod.

8. The vertebroplasty stent of claim 7, wherein the mounting structure is a slot open at the proximal end of the main shaft.

9. A vertebroplasty support according to any of claims 1 to 8, wherein the number of the support portions is two, and the two support portions are spaced 180 ° apart from each other on opposite sides of the main shaft.

10. A vertebroplasty support according to claim 9 wherein the free ends of the support plates are provided with elongated plates, the elongated plates of the two support plates being offset from each other without interfering with each other when the two support portions are in a closed position.

11. The vertebroplasty stent of claim 10 wherein the elongated plate is formed by extending the support plate and has a width less than the width of the support plate.

12. The vertebroplasty stent according to any one of claims 1 to 8, wherein the number of the support portions is four, and every two adjacent support portions are spaced apart from each other by 90 ° at the outer circumferential side of the main shaft.

13. The vertebroplasty stent of claim 1, wherein the material of the vertebroplasty stent is a degradable material.

Technical Field

The invention relates to the technical field of medical instruments, in particular to a vertebral body forming support.

Background

Vertebroplasty (VBS) is mainly used for the treatment of vertebral compression fractures caused by osteoporosis. The expandable stent is placed into a vertebral body through a minimally invasive technique, the vertebral body is reset through stent expansion, and the expanded stent needs to be retained in the vertebral body so as to stabilize the expanded vertebral body, prevent the vertebral body from further collapsing and relieve pain of a patient. And then injecting bone cement into the vertebral body for filling so as to restore the height of the vertebral body and relieve the pain of a patient.

At present, the existing vertebral body forming support is low in strength, poor in plasticity and low in support force, and is difficult to completely open the vertebral body. In addition, the stent needs to bear larger pressure in the expansion process, and the stressed part of the stent is easy to twist and break.

If the supporting force of the bracket is improved by increasing the wall thickness of the bracket, the bracket is oversized. In the vertebroplasty, the stent needs to be delivered into the vertebral body through a delivery sheath, and the inner diameter of the delivery sheath is smaller, so that the stent cannot be delivered into the vertebral body through the delivery sheath if the size of the stent is too large. And the height of the existing support can not be adjusted and recovered.

Disclosure of Invention

In view of the above, there is a need to provide a vertebroplasty support with adjustable height and high support strength.

A vertebroplasty stent, comprising:

a main shaft rod;

the supporting part is arranged at the far end of the main shaft rod and is configured to be radially opened or radially closed when the supporting part moves relative to the main shaft rod, and the supporting part comprises a supporting plate which is configured to be used for supporting a vertebral body when the supporting part is in the opened state;

and the traction part is connected with the main shaft rod and the supporting part and is used for controlling the supporting part to be folded or unfolded along the radial direction of the main shaft rod.

In one embodiment, the spindle shaft surface is provided with an external thread; the traction part comprises a connecting piece, a traction rod and a gear, the connecting piece is sleeved at the near end of the main shaft rod and is configured to rotate relative to the main shaft rod, the near end of the traction rod is fixed on the connecting piece, the gear is rotatably arranged at the far end of the traction rod and meshed with the external thread, and the gear is connected with the supporting part and drives the supporting part to rotate.

In one embodiment, the supporting portion further includes a supporting arm, one end of the supporting arm is fixed to the gear, the other end of the supporting arm is fixed to the supporting plate, and the other end of the supporting plate is a free end.

In one embodiment, the support plate includes a connecting section and a support surface, one end of the connecting section is fixed to the other end of the support arm, and when the support portion is in the open state, the support surface is at least partially parallel to the main shaft rod or the axial direction.

In one embodiment, the supporting surface is an outer convex arc surface; or

The support surface is a streamline support surface, and the middle of the streamline support surface is low and the two sides are high.

In one embodiment, one gear corresponds to two traction rods and two supporting arms, the two traction rods are arranged in parallel at intervals, the two supporting arms are respectively positioned on two opposite sides of the gear, and each supporting arm is positioned between the traction rod and the gear.

In one embodiment, the proximal end of the spindle shaft is provided with a fitting structure for mating with a push rod.

In one embodiment, the mounting structure is a slot provided at the proximal end of the spindle shaft.

In one embodiment, the number of the supporting parts is two, and the two supporting parts are mutually distributed on two opposite sides of the main shaft rod at an interval of 180 degrees.

In one embodiment, the free ends of the supporting plates are provided with elongated plates, and the elongated plates of the two supporting plates are staggered from each other and do not interfere with each other when the two supporting parts are closed.

In one embodiment, the elongated plate is formed by extending the support plate, and the width of the elongated plate is smaller than that of the support plate.

In one embodiment, the number of the supporting parts is four, and every two adjacent supporting parts are distributed on the outer periphery side of the main shaft rod at intervals of 90 degrees.

In one embodiment, the material of the vertebroplasty scaffold is a degradable material.

The vertebral body forming bracket at least has the following advantages:

the vertebral body forming support is sent into a vertebral body cavity through the pushing rod in an unopened form, after the designated position is reached, the pushing rod drives the main shaft rod to move, the supporting portion radially opens when moving towards the near end relative to the far end of the main shaft rod, and the supporting plate is configured to be used for opening the vertebral body cavity when the supporting portion is in an opened state, so that the vertebral body cavity can be better supported. The expanded centrum forming support is sent into a centrum cavity in an unopened form, can be guaranteed to smoothly pass through a conveying sheath, and can be expanded through the opened supporting part after reaching a specified position, so that the material defect is effectively avoided, and the requirement of high supporting force in the centrum is met. If the height is not proper, the pushing rod can be acted in the opposite direction, the supporting part is folded along with the pushing rod, and the opening angle of the supporting part is adjusted by adjusting the forward or reverse movement of the main shaft rod, so that the height is adjusted. When the supporting part is completely folded, the vertebral body forming support can be recovered; when the supporting part is expanded to reach the required height, the pushing rod is separated from the vertebral body forming support to complete the release.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural view of a vertebroplasty stent in an embodiment, in which the support portion is in an unopened (closed) state;

FIG. 2 is another schematic structural view of the vertebroplasty stent of FIG. 1, wherein the support portion is in an expanded state;

FIG. 3 is a schematic view of the vertebroplasty stent of FIG. 1 being delivered into a vertebral cavity;

FIG. 4 is a schematic view of the vertebroplasty stent of FIG. 1 expanded within the vertebral cavity;

FIG. 5 is a side view of a support plate in other embodiments, the support surface of the support plate being a streamlined support surface;

FIG. 6 is a schematic structural view of another embodiment vertebroplasty stent, showing the structure of the elongated plate with the support portion in an expanded state;

FIG. 7 is a partial view of FIG. 6, wherein the support portion is in a closed position and the two elongated plates are staggered from each other and do not interfere with each other;

FIG. 8 is a schematic structural view of a vertebroplasty stent in a further embodiment, wherein the support is in an expanded state;

fig. 9 is a schematic view of the vertebroplasty stent of fig. 8 expanded within the vertebral cavity.

Description of reference numerals:

10, 11, 12, vertebroplasty scaffolds; 100. a main shaft rod; 200. a connecting member; 300. a support portion; 110. an external thread; 310. a draw bar; 320. a gear; 330. a support arm; 20. a push rod; 30. a delivery sheath; 40. a vertebral body cavity; 332. a support plate; 333. a connecting section; 335. a support surface; 120. a card slot; 336. a lengthening plate; 337. the support surface is lengthened.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the term "proximal" refers to the end that is proximal to the operator during delivery into the vertebral body cavity, and correspondingly, the term "distal" refers to the end that is distal from the operator during delivery into the vertebral body cavity. "axial" refers to the axial direction of the spindle shaft. This is done solely for the purpose of facilitating the description of the invention and simplifying the description, and is not intended to indicate or imply that the device or element so referred to must be in a particular orientation, constructed and operated, and therefore should not be taken as limiting the invention.

As shown in fig. 1 and 2, the vertebroplasty stent 10 in one embodiment may be made of degradable material, such as magnesium alloy, zinc alloy, etc., and may achieve non-implantation for intervention and be compatible with other internal solids at a later stage. The elasticity modulus of the magnesium alloy and the zinc alloy is close to that of bone tissues, and the magnesium alloy and the zinc alloy have good biocompatibility and are ideal fully degradable and implantable orthopedic materials. Of course, in other embodiments, the vertebroplasty stent 10 may also be a non-degradable material.

Specifically, the vertebroplasty stent 10 comprises a main shaft 100, a traction portion and a support portion 300. The support portion 300 is disposed at a distal end of the main shaft 100 and configured to be radially opened or radially closed when moving relative to the main shaft 100. More specifically, the relative movement between the support 300 and the main shaft 100 means that the support 300 moves relative to the main shaft 100 from the far end to the near end or from the near end to the far end along the main shaft 100, and the support 300 may be moved without the displacement of the support 300, or the support 300 may be moved without the displacement of the main shaft 100. The support 300 includes a support plate 332, the support plate 332 being configured to support the vertebral body when the support 300 is in the expanded state. For example, when the support portion 300 is in the expanded state, the support plate at least partially extends or extends in a direction parallel to the axial direction of the main shaft 100 or the main shaft, so as to provide a better support for the vertebral body cavity. In particular, the parallel portion may be a plane, an arc, or other non-planar surface. The traction part is connected with the main shaft rod 100 and the support part 300, and is used for controlling the support part 300 to be folded or unfolded along the radial direction of the main shaft rod 100.

The vertebroplasty support 10 is delivered into the vertebral cavity 40 through the push rod 20 in an unopened state, and after reaching a designated position, the push rod 20 drives the main shaft rod 100 to move, the support portion 300 radially opens when moving relative to the main shaft rod 100, and the support plate is configured to be used for propping open the vertebral body when the support portion 300 is in an opened state, so that the vertebral body cavity 40 can be better supported. The expanded vertebroplasty stent 10 can be delivered into the vertebral body cavity 40 in an unopened form to smoothly pass through the delivery sheath 30, and then the expanded vertebroplasty stent 300 is delivered to a designated position, so that the material defect is effectively avoided, and the requirement of high support force in the vertebral body is met. If the height is not proper, the pushing rod 20 can be reversely acted, the supporting part 300 moves towards the far end relative to the near end of the main shaft rod 100, the supporting part 300 is folded, and the opening angle of the supporting part 300 is adjusted by adjusting the forward or reverse movement of the main shaft rod 100, so that the height is adjusted. When the support portion 300 is fully closed, the vertebroplasty stent 10 may be retracted; when the supporting portion 300 is expanded to reach the desired height, the pushing rod 20 is separated from the vertebroplasty stent 10, and the release is completed.

In this embodiment, the number of the supporting portions 300 is two, and the two supporting portions 300 are spaced at an interval of 180 ° from each other at opposite sides of the main shaft 100. The two supporting portions 300 are used to expand the vertebral body cavity in the upper and lower directions, respectively.

The main shaft 100 is provided with an external thread 110 on the surface. The traction part comprises a connecting member 200, a traction rod 310 and a gear 320, wherein the connecting member 200 is sleeved on the proximal end of the spindle rod 100 and is configured to rotate relative to the spindle rod 100. That is, the spindle shaft 100 may rotate relative to the link 200. The connecting member 200 is substantially a plate-shaped structure, a through hole is formed in the middle of the connecting member 200, and the main shaft 100 is inserted into the through hole of the connecting member 200. That is, the main shaft 100 and the link 200 are not fixed to each other, and when the main shaft 100 rotates in the forward direction or in the reverse direction, the relative position between the main shaft 100 and the link 200 changes.

The proximal end of the drawbar 310 is fixed to the connection member 200 to ensure that the relative position of the support 300 and the connection member 200 is maintained. Specifically, a fixing hole is formed at the proximal end of the drawbar 310, and a fastening member such as a pin shaft is inserted into the fixing hole to fix the proximal end of the drawbar 310 to the connection member 200. The gear 320 is rotatably disposed at the distal end of the drawbar 310 and engaged with the external thread, and the gear 320 is connected to the support 300 and drives the support 300 to rotate. That is, the gear 320 is rotatable with respect to the drawbar 310, so that the gear 320 is relatively moved along the spindle shaft 100 during rotation by rotating the spindle shaft 100 and the external thread 110 to rotate the gear 320 engaged therewith, and radial opening and radial closing of the support 300 is controlled during rotation of the gear 320.

The support portion 300 further includes a support arm 330, one end of the support arm 330 is fixedly disposed on the gear 320, the other end of the support arm 330 is fixed on the support plate 332, and the other end of the support plate 332 is a free end. That is, the support arm 330 is located on the outer circumferential side of the spindle shaft 100, and the support arm 330 rotates according to the rotation of the gear 320. For example, one end of the support arm 330 may be fixed to the gear 320 by a pin, one end of the support plate 332 may be fixed to the other end of the support arm 330 by a pin, and the free end of the support plate 332 may be used to distract the vertebral bodies.

Referring to FIG. 3, the vertebroplasty stent 10 is delivered in an unexpanded configuration through the push rod 20 into the vertebral cavity 40. After the designated position is reached, the pushing rod 20 is rotated, the main shaft 100 synchronously rotates to drive the two gears 320 to rotate, the two gears 320 rotate to drive the two supporting parts 300 to rotate together, and the two supporting parts 300 are opened to prop open the upper and lower surfaces of the vertebral body (as shown in fig. 4). The non-expanded shape is sent into the vertebral body cavity 40 to ensure that the supporting part 300 smoothly passes through the delivery sheath 30, the supporting part 300 is expanded in a gear 320 transmission mode after reaching a specified position, the expansion of the vertebral body forming bracket 10 is realized through a mechanical gear 320 transmission structure, the material defect is effectively avoided, and the requirement of high supporting force in the vertebral body is met.

If the height is not proper, the pushing rod 20 can be rotated in the opposite direction, the pushing rod 20 drives the main shaft rod 100 to rotate in the opposite direction, the main shaft rod 100 drives the gear 320 to rotate in the opposite direction, the gear 320 drives the supporting part 300 to rotate in the opposite direction, the supporting part 300 is folded, the gear 320 is driven to rotate in the forward direction or the opposite direction by adjusting the forward direction or the opposite direction rotation of the main shaft rod 100, the supporting part 300 is adjusted to be opened or folded, and the height (the angle formed between the supporting part 300 and the main shaft rod 100) is adjusted. When the support portion 300 is fully closed, the vertebroplasty stent 10 may be retracted; when the supporting portion 300 is expanded to reach the desired height, the pushing rod 20 is separated from the vertebroplasty stent 10, and the release is completed.

Further, the supporting plate 332 includes a connecting section 333 and a supporting surface 335, one end of the connecting section 333 is fixed to the other end of the supporting arm 330, when the supporting portion 300 is in the opened state, the supporting surface 335 is at least partially parallel to the main shaft 100, and the supporting surface 335 is in direct contact with the inner wall of the vertebral body. The connecting segment 333 may be integrally formed with the support surface 335.

In the embodiment shown in fig. 1, the bearing surface 335 is an arcuate outer surface that expands against the vertebral body to form the vertebral cavity 40. The supporting surface 335 is a convex arc surface, which can be well attached to the inner wall of the vertebral body, and avoids the stress concentration phenomenon of the supporting surface 335 on the vertebral body. Referring to fig. 5, in another embodiment, the supporting surface 335 is a streamlined supporting surface, and the middle of the streamlined supporting surface is low and two sides of the streamlined supporting surface are high. Because the vertebral body has a special physiological structure, namely the upper end of the vertebral body is in a shape of 'two sides high and middle low', the supporting surface 335 adopts a streamline design with the middle low and two sides high so as to adapt to the physiological structure of the vertebral body.

Referring to fig. 1 and 2 again, one gear 320 corresponds to two traction rods 310 and two support arms 330, the two traction rods 310 are arranged in parallel at intervals, the two support arms 330 are respectively located at two opposite sides of the gear 320, and each support arm 330 is located between the traction rod 310 and the gear 320. Specifically, the proximal ends of the two traction rods 310 are respectively fixed to the connecting member 200 by a pin, the gear 320 is rotatably disposed at the distal end of the traction rod 310 by a rotating shaft, the gear 320 is disposed between the two traction rods 310, and the supporting arm 330 is disposed between the gear 320 and the traction rod 310, so that the whole structure is more stable, and the rotational force transmitted from the gear 320 received by the supporting plate 332 from the supporting arm 330 is more uniform.

Further, the proximal end of the spindle rod 100 is provided with an assembling structure for matching with the pushing rod 20. Specifically, the assembly structure is a clamping groove 120 formed in the proximal end of the spindle rod 100, and correspondingly, a clamping protrusion matched with the clamping groove 120 is arranged on the push rod 20, and the push rod 20 rotates to drive the spindle rod 100 to rotate through the matching of the clamping protrusion and the clamping groove 120.

Referring to fig. 6 and 7, in another embodiment of the vertebroplasty frame 11, in the vertebroplasty frame 11 shown in fig. 6, on the basis of the supporting plate 332 in the vertebroplasty frame 10 shown in fig. 1, an elongated plate 336 is additionally disposed at the free end of the supporting plate 332 of fig. 6, and when the supporting portion 300 is folded, the elongated plates 336 of the two supporting plates 332 are disposed in a staggered manner without interfering with each other. Because the volume and shape of the vertebral bodies of different patients are slightly different, different shapes of the support plate 332 are used to match the various vertebral body environments. Extension plate 336 is thus provided to accommodate a larger volume vertebral body.

Specifically, the elongated plate 336 is formed by extending the support plate 332, and the width of the elongated plate 336 is smaller than the width of the support plate 332, so as to avoid the elongated plate 336 from interfering with each other, and the elongated plate 336 is integrally formed with the support plate 332. The elongated plate 336 has an elongated support surface 337, and the elongated support surface 337 contacts the inner wall of the vertebral body to act as a distraction of the vertebral body. The support area of the vertebroplasty stent 10 is increased by extending the length of the support plate 332 to form an elongated plate 336.

Referring to fig. 8, a vertebral body forming support 12 according to another embodiment is different from the embodiment shown in fig. 1 in that, in the vertebral body forming support 12 shown in fig. 8, the number of the support portions 300 is four, and every two adjacent support portions 300 are distributed on the outer circumferential side of the main shaft 100 at an interval of 90 ° with each other. The four support portions 300 are used to expand the vertebral cavity 40 in four directions, i.e., up, down, left, and right, respectively, to further expand the volume of the vertebral cavity 40. Referring to fig. 9, the support portion 300 is opened to cover the upper, lower, left and right directions of the vertebral body cavity 40.

The main shaft 100 is provided with an external thread 110 on the surface. The traction part comprises a connecting member 200, a traction rod 310 and a gear 320, the connecting member 200 is sleeved on the proximal end of the spindle rod 100, and the spindle rod 100 can rotate relative to the connecting member 200. The connecting member 200 is substantially a plate-shaped structure, a through hole is formed in the middle of the connecting member 200, and the main shaft 100 is inserted into the through hole of the connecting member 200. That is, the main shaft 100 and the link 200 are not fixed to each other, and when the main shaft 100 rotates in the forward direction or in the reverse direction, the relative position between the main shaft 100 and the link 200 changes.

The proximal end of the drawbar 310 is fixed to the connection member 200 to ensure that the relative position of the support 300 and the connection member 200 is maintained. Specifically, a fixing hole is formed at the proximal end of the drawbar 310, and a fastening member such as a pin shaft is inserted into the fixing hole to fix the proximal end of the drawbar 310 to the connection member 200. The gear 320 is rotatably disposed at the distal end of the drawbar 310, the gear 320 is connected to the support 300, and the gear 320 is engaged with the external thread 110 of the spindle shaft 100, i.e., the gear 320 is rotatable with respect to the drawbar 310.

The support portion 300 further includes a support arm 330, one end of the support arm 330 is fixedly disposed on the gear 320, the other end of the support arm 330 is fixed on the support plate 332, and the other end of the support plate 332 is a free end. That is, the support arm 330 is located on the outer circumferential side of the spindle shaft 100, and the support arm 330 rotates according to the rotation of the gear 320. For example, one end of the support arm 330 may be fixed to the gear 320 by a pin, one end of the support plate 332 may be fixed to the other end of the support arm 330 by a pin, and the free end of the support plate 332 may be used to distract the vertebral bodies.

The vertebroplasty stent 10 is delivered in an unexpanded configuration through the pusher rod 20 into the vertebral cavity 40. After the designated position is reached, the pushing rod 20 is rotated, the main shaft rod 100 synchronously rotates to drive the four gears 320 to rotate, the four gears 320 respectively drive the four supporting parts 300 to rotate, and the four supporting parts 300 are opened to prop open the upper surface, the lower surface, the left surface and the right surface of the cone body (as shown in fig. 9). The non-expanded shape is sent into the vertebral body cavity 40 to ensure that the supporting part 300 smoothly passes through the delivery sheath 30, the supporting part 300 is expanded in a gear 320 transmission mode after reaching a specified position, the expansion of the vertebral body forming bracket 10 is realized through a mechanical gear 320 transmission structure, the material defect is effectively avoided, and the requirement of high supporting force in the vertebral body is met.

If the height is not proper, the pushing rod 20 can be rotated in the opposite direction, the supporting part 300 is folded, the main shaft rod 100 is adjusted to rotate in the forward direction or the reverse direction, the gear 320 is driven to rotate in the forward direction or the reverse direction, the opening angle of the supporting part 300 is adjusted, and the height adjustment is completed. When the support portion 300 is fully closed, the vertebroplasty stent 10 may be retracted; when the supporting portion 300 is expanded to reach the desired height, the pushing rod 20 is separated from the vertebroplasty stent 10, and the release is completed.

Of course, in other embodiments, a vertebroplasty frame 10 may include three, five or six support portions 300, and each support portion 300 is uniformly distributed on the outer circumference of the main shaft 100.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.