Vertebroplasty bone cement filling device

Abstract

The invention discloses a vertebral body forming bone cement filling device, and relates to the technical field of medical equipment, the vertebral body forming bone cement filling device comprises a mesh bag, the mesh bag is formed by weaving 106D (+ / -3D) multifilaments, and the number of monofilaments of the multifilaments is larger than or equal to 42F; the umbrella rib support is arranged in the mesh bag; the umbrella rib support comprises a fixed seat, a sliding seat and a plurality of contraction and expansion mechanisms, and the fixed seat and the sliding seat are coaxial; the first end of the bone cement injection pipe is used for being detachably connected with the end, close to the sliding seat, of the fixing seat, a plug is arranged at the second end of the bone cement injection pipe, a plurality of bone cement injection holes are formed in the side wall of the bone cement injection pipe, and the bone cement injection holes are close to the fixing seat; the umbrella rib pushing pipe is arranged on the bone cement injection pipe in a sliding and sleeving mode, and the sliding seat is annular and is arranged on the umbrella rib pushing pipe in a sliding and sleeving mode. The safety and effectiveness of the vertebroplasty are effectively improved, and complex and diversified clinical requirements can be better met.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a vertebroplasty bone cement filling device. Background Art

[0002] In the field of vertebroplasty surgery, a bone filling mesh bag is one of the commonly used medical devices. In an ideal state, after bone cement is injected into the bone filling mesh bag, its polymer mesh layer structure can theoretically wrap most of the bone cement, thereby preventing bone cement leakage. Moreover, the bone cement diffusing out from the mesh holes can better fit with the trabeculae in the vertebral body, making the combination of the bone cement and the vertebral body tighter.

[0003] Currently, the existing bone filling mesh bags on the market generally use PET filaments for weaving, and mainly present two types: single-layer mesh and double-layer mesh. However, such traditional bone filling mesh bags have many defects. On the one hand, the weaving of the mesh bag is not fine enough, and the relevant parameter requirements are relatively low. This leads to the fact that when bone cement is injected into the mesh bag during actual use, the bone cement is very likely to penetrate the mesh bag. For example, in the case of conventional vertebroplasty surgery, its treatment scope is relatively limited, mainly applicable to vertebral body compression fractures in the lower thoracic and lumbar regions caused by vertebral tumors, osteoporosis or trauma.

[0004] For the situation where the degree of vertebral body compression exceeds 70% and the posterior wall of the vertebral body is damaged and incomplete, since the nerves close to the posterior wall of the vertebral body are mainly the spinal cord and the cauda equina. Once bone cement leakage occurs, if the leaked bone cement touches the spinal cord or nerves, it is very likely to cause spinal cord compression or injury, thereby directly affecting nerve function and bringing great harm to the physical health of patients.

[0005] In addition, the traditional bone filling mesh bag has certain limitations in its working mode. Its main function is only to relieve pain by raising part of the vertebral body height and increasing the vertebral body strength, and it cannot effectively block the gap in the posterior wall of the vertebral body, making it difficult to meet more complex and diverse clinical needs. Summary of the Invention

[0006] The purpose of the present invention is to provide a vertebroplasty bone cement filling device to solve the problems existing in the above-mentioned prior art and improve the safety and effectiveness of vertebroplasty surgery.

[0007] To achieve the above purpose, the present invention provides the following solution:

[0008] The present invention provides a vertebroplasty bone cement filling device, including:

[0009] A mesh bag, which is woven from multifilaments of 106D (±3D), and the number of single filaments of the multifilaments ≥ 42F;

[0010] An umbrella rib bracket, the umbrella rib bracket is arranged inside the mesh bag; the umbrella rib bracket includes a fixed seat, a sliding seat and a plurality of expansion and contraction mechanisms, the fixed seat and the sliding seat are coaxial; each of the expansion and contraction mechanisms includes six connecting rods, namely a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a fifth connecting rod and a sixth connecting rod. The first end of the first connecting rod is hinged to the fixed seat, and the second end is slidably matched with the second connecting rod. The first end of the second connecting rod is hinged to the sliding seat, and the second end is hinged to the fourth connecting rod. The first end of the third connecting rod is hinged to the first connecting rod, and the second end is hinged to the first end of the fourth connecting rod. The second end of the fourth connecting rod is hinged to the sixth connecting rod. The first end of the fifth connecting rod is hinged to the second connecting rod, and the second end is hinged to the first end of the sixth connecting rod. A sharp corner is fixedly provided at the second end of the sixth connecting rod, and the tip of the sharp corner faces away from the first end of the sixth connecting rod; the mesh bag is connected to the second end of each of the sixth connecting rods through a connecting line.

[0011] A bone cement injection tube, the first end of the bone cement injection tube is used for detachably connecting to one end of the fixed seat close to the sliding seat, a plug is provided at the second end of the bone cement injection tube, and a plurality of bone cement injection holes are provided on the side wall of the bone cement injection tube, and the bone cement injection holes are close to the fixed seat.

[0012] An umbrella rib push tube, the umbrella rib push tube is slidably sleeved on the bone cement injection tube, the sliding seat is annular and slidably sleeved on the umbrella rib push tube, a limiting step is provided on the umbrella rib push tube, and the limiting step can abut against one end of the sliding seat away from the fixed seat, and the sliding seat is located between the fixed seat and the limiting step.

[0013] Preferably, all the hinge shafts in the same expansion and contraction mechanism are parallel to each other.

[0014] Preferably, all the expansion and contraction mechanisms are evenly distributed along the circumferential direction of the fixed seat.

[0015] Preferably, a chute is provided in the middle of the second connecting rod, and the second end of the first connecting rod is slidably matched with the chute.

[0016] Preferably, the connecting line is made of PET silk thread.

[0017] Preferably, through holes are respectively provided at the hinged parts of two different connecting rods, and the two through holes are connected by a PET silk thread to realize the hinge of the two different connecting rods.

[0018] Preferably, the materials of the fixed seat, the sliding seat and all the connecting rods are titanium.

[0019] Preferably, a handle is also fixedly provided on the bone cement injection tube, and the handle is close to the second end of the bone cement injection tube.

[0020] Preferably, a handle is also fixedly provided at one end of the umbrella bone push tube away from the umbrella bone bracket.

[0021] Preferably, the handle is threadedly connected to the handle.

[0022] The present invention has achieved the following technical effects compared with the prior art:

[0023] The vertebral body forming bone cement filling device of the present invention effectively improves the safety and effectiveness of the vertebral body forming operation through the improvement of the mesh bag material, the setting of the umbrella bone bracket, and the reasonable material selection and connection method, etc., can better meet the complex and diverse clinical needs, and at the same time improves the overall stability and operability of the device.

[0024] Furthermore, the mesh bag in the present invention is woven from multifilaments of 106D (±3D), and the number of monofilaments in the multifilament is ≥42F. Compared with the traditional bone filling mesh bag that is generally woven with PET silk thread on the market and the weaving is not fine enough and the parameter requirements are relatively low, this weaving method significantly improves the fineness of the mesh bag. It has been experimentally proven that in the mesh bag of the present invention, the bone cement only leaks slightly under 10 atm.

[0025] Furthermore, during the vertebral body forming operation, when injecting bone cement into the mesh bag, the fine mesh bag structure can more effectively block the leakage of the bone cement. Due to the insufficiently fine weaving of the traditional mesh bag, the bone cement is extremely easy to penetrate the mesh bag, while the mesh bag in the present invention can greatly reduce the risk of bone cement leakage, especially for the case where the posterior wall of the vertebral body is close to the spinal cord and cauda equina nerve, effectively reducing the possibility of spinal cord compression or injury caused by the bone cement leakage touching the spinal cord or nerve, thereby improving the safety of the operation.

[0026] Furthermore, the present invention provides an umbrella bone bracket in the mesh bag, and its unique structural design includes a fixed seat, a sliding seat and a plurality of expansion and contraction mechanisms. Through the connection methods such as hinging and sliding cooperation between the connecting rods, the umbrella bone bracket can perform specific expansion and contraction actions.

[0027] During the operation, when the umbrella bone push tube drives the sliding seat to move relative to the fixed seat, the expansion and contraction mechanism can correspondingly change its shape, thereby driving the mesh bag to deform, enabling the mesh bag to better conform to the shape of the posterior wall of the vertebral body and effectively sealing the gap in the posterior wall of the vertebral body. This cannot be achieved by the working mode of traditional bone filling mesh bags that simply relieve pain by raising part of the vertebral height and increasing the vertebral strength. The vertebral body forming bone cement filling device of the present invention can meet more complex and diverse clinical needs, such as for cases where the posterior wall of the vertebral body is damaged or incomplete, improving the effectiveness of the surgical treatment effect.

[0028] Furthermore, the materials of the fixed seat, sliding seat, and all connecting rods of the umbrella bone bracket are all titanium. Titanium has advantages such as good biocompatibility, high strength, and corrosion resistance. Selecting titanium as the material can ensure that the umbrella bone bracket works stably in the human body for a long time, is not prone to problems such as deformation and corrosion, and guarantees the overall stability of the device.

[0029] Furthermore, through holes are respectively provided at the hinge joints of two different connecting rods, and the two through holes are connected by PET silk threads to achieve the hinge connection of the two different connecting rods. This connection method not only ensures that the connecting rods can rotate flexibly to achieve the expansion and contraction function of the umbrella bone bracket, but also has a certain connection strength, further enhancing the stability of the structure of the umbrella bone bracket.

[0030] Furthermore, a handle is fixedly installed on the bone cement injection tube near its second end, which is convenient for medical staff to hold and operate the injection tube to inject bone cement. A handle is fixedly installed at the end of the umbrella bone push tube far away from the umbrella bone bracket, and the handle is threadedly connected to the handle, so that when medical staff operate, they can drive the axial movement of the umbrella bone push tube by rotating the handle, making it more convenient and accurate to push the sliding seat, facilitating the control of the expansion and contraction action of the umbrella bone bracket and the position and state of the entire device in the vertebral body, and improving the convenience and operability of medical staff to operate this device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 is a schematic structural diagram of the vertebral body forming bone cement filling device of the present invention;

[0033] Figure 2 is Figure 1 a partial enlarged view of part A in

[0034] Figure 3 Partial structural schematic diagram of the vertebroplasty bone cement filling device of the present invention;

[0035] Figure 4 Schematic diagram of the microscopic interlocking formed between the bone cement and the spine after the bone cement oozes out of the mesh bag;

[0036] In the figure: 1. Mesh bag; 2. Fixed seat; 3. Bone cement injection tube; 4. Bone cement injection hole; 5. First connecting rod; 6. Second connecting rod; 7. Third connecting rod; 8. Fourth connecting rod; 9. Fifth connecting rod; 10. Sixth connecting rod; 11. Sharp corner; 12. Sliding seat; 13. Umbrella bone push tube; 14. Handle; 15. Handle; 16. Plug. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] The purpose of the present invention is to provide a vertebroplasty bone cement filling device to solve the problems existing in the above-mentioned prior art and improve the safety and effectiveness of vertebroplasty surgery.

[0039] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0040] As Figures 1 to 3 shown, this embodiment provides a vertebroplasty bone cement filling device, including:

[0041] A mesh bag 1, the mesh bag 1 is woven from multifilaments of 106D (±3D), and the number of single filaments of the multifilaments ≥ 42F;

[0042] The umbrella rib bracket is arranged inside the mesh bag 1; the umbrella rib bracket includes a fixed seat 2, a sliding seat 12 and a plurality of expansion and contraction mechanisms. The fixed seat 2 and the sliding seat 12 are coaxial; each expansion and contraction mechanism includes six connecting rods, namely a first connecting rod 5, a second connecting rod 6, a third connecting rod 7, a fourth connecting rod 8, a fifth connecting rod 9 and a sixth connecting rod 10. The first end of the first connecting rod 5 is hinged to the fixed seat 2, and the second end is slidably matched with the second connecting rod 6. The first end of the second connecting rod 6 is hinged to the sliding seat 12, and the second end is hinged to the fourth connecting rod 8. The first end of the third connecting rod 7 is hinged to the first connecting rod 5, and the second end is hinged to the first end of the fourth connecting rod 8. The second end of the fourth connecting rod 8 is hinged to the sixth connecting rod 10. The first end of the fifth connecting rod 9 is hinged to the second connecting rod 6, and the second end is hinged to the first end of the sixth connecting rod 10. A sharp corner 11 is fixedly provided at the second end of the sixth connecting rod 10, and the tip of the sharp corner 11 faces away from the first end of the sixth connecting rod 10; the mesh bag 1 is connected by a connecting line to the second end of each sixth connecting rod 10;

[0043] The bone cement injection tube 3, the first end of the bone cement injection tube 3 is used for detachably connecting to one end of the fixed seat 2 close to the sliding seat 12. A plug 16 is provided at the second end of the bone cement injection tube 3. A plurality of bone cement injection holes 4 are provided on the side wall of the bone cement injection tube 3, and the bone cement injection holes 4 are close to the fixed seat 2;

[0044] The umbrella rib push tube 13 is slidably sleeved on the bone cement injection tube 3. The sliding seat 12 is annular and slidably sleeved on the umbrella rib push tube 13. A limiting step (not shown in the figure) is provided on the umbrella rib push tube 13, and the limiting step can abut against one end of the sliding seat 12 away from the fixed seat 2. The sliding seat 12 is located between the fixed seat 2 and the limiting step.

[0045] The detachable connection between the bone cement injection tube 3 and the fixed seat 2 can specifically be a threaded connection. In this embodiment, a stud is provided at one end of the fixed seat 2 close to the sliding seat 12. The inner wall of the first end of the bone cement injection tube 3 is provided with internal threads, and the fixed seat 2 is connected to the internal threads on the bone cement injection tube 3 through the stud, so as to realize the detachable connection between the bone cement injection tube 3 and the fixed seat 2.

[0046] It should be noted that the mesh bag 1 is integrally in a closed bag shape, rather than Figure 1 and Figure 2 the umbrella surface shape in Figure 1 and Figure 2 The mesh bag 1 is drawn as an umbrella surface shape in

[0047] ​In this embodiment, the mesh bag 1 is woven from multifilaments of 106D (±3D), and the number of monofilaments in the multifilament is ≥42F. Compared with the traditional bone filling mesh bags commonly used in the market, which are woven with PET silk threads and are not woven densely enough and have relatively low parameter requirements, this weaving method significantly improves the density of the mesh bag 1. Experiments have proved that in the mesh bag 1 of the present invention, under 10 atm, only a little leakage of bone cement occurs. During vertebroplasty, when injecting bone cement into the mesh bag 1, the dense structure of the mesh bag 1 can more effectively block the leakage of bone cement. Due to the insufficiently dense weaving of the traditional mesh bag, the bone cement easily penetrates the mesh bag 1, while the mesh bag 1 in the present invention can greatly reduce the risk of bone cement leakage. Especially for the case where the posterior wall of the vertebra is close to the spinal cord and cauda equina, it effectively reduces the possibility of spinal cord compression or injury caused by the bone cement leakage touching the spinal cord or nerve, thus improving the safety of the operation.

[0048] During the operation, when the umbrella rib push tube 13 pushes the sliding seat 12 to move relative to the fixed seat 2, the expansion and contraction mechanism can correspondingly change its shape, and then drive the mesh bag 1 to deform, so that the mesh bag 1 can better fit the shape of the posterior wall of the vertebra and effectively seal the gap in the posterior wall of the vertebra. This cannot be achieved by the working mode of the traditional bone filling mesh bag 1 that simply relieves pain by raising part of the vertebral height and increasing the vertebral strength. The vertebroplasty bone cement filling device of this embodiment can meet more complex and diverse clinical needs, such as for the cases of damage and incompleteness of the posterior wall of the vertebra, improving the effectiveness of the surgical treatment effect. In addition, since the strength of the umbrella rib bracket itself is not high, during the process of the umbrella rib bracket propping up the mesh bag by external force, the umbrella rib bracket can passively fit the inner wall of the target space.

[0049] In this embodiment, all the hinge shafts in the same expansion and contraction mechanism are parallel to each other. When the umbrella rib push tube 13 pushes the sliding seat 12 to move relative to the fixed seat 2, triggering the expansion and contraction mechanism to perform the expansion and contraction action, the connecting rods are connected through the hinge shafts and cooperate with each other in motion. The design that all the hinge shafts are parallel to each other enables the relative movement between the connecting rods to proceed along a specific and unified direction. For example, the first connecting rod 5 is connected to the second connecting rod 6, the third connecting rod 7, etc. through the hinge shafts. Due to the parallel hinge shafts, there will be no problems such as jamming and interference caused by inconsistent hinge shaft directions during their movement, thus ensuring that the force can be smoothly transmitted between the connecting rods and enabling the expansion and contraction mechanism to perform the expansion and contraction action smoothly as expected.

[0050] In an alternative embodiment of the present embodiment, preferably, all the expansion and contraction mechanisms are evenly distributed along the circumferential direction of the fixed seat 2. When the umbrella rib push tube 13 pushes the sliding seat 12 to move relative to the fixed seat 2, causing the expansion and contraction mechanisms to perform the expansion and contraction actions, the evenly distributed expansion and contraction mechanisms can evenly transmit the force to the mesh bag 1. The force generated by each expansion and contraction mechanism during the movement process can act more evenly on the corresponding part of the mesh bag 1, avoiding the situation of excessive or insufficient local force; this enables the mesh bag 1 to conform to the shape of the posterior wall of the vertebral body as a whole and evenly when deformed under the action of force, so as to more effectively block the posterior wall of the vertebral body and better adapt to the spatial shape inside the vertebral body, improving the surgical effect.

[0051] In an alternative embodiment of the present embodiment, preferably, a chute is provided in the middle of the second connecting rod 6, and the second end of the first connecting rod 5 is slidably engaged with the chute.

[0052] In an alternative embodiment of the present embodiment, preferably, the connecting line is made of PET silk thread. PET silk thread has good biocompatibility. When the device is implanted into the human body, the connecting line will not cause a strong reaction of the human immune system and will not cause obvious irritation, inflammation and other adverse effects on the surrounding tissues. Compared with some materials that may cause allergic reactions or other adverse physiological reactions in the human body, PET silk thread can coexist more harmoniously with human tissues, enabling the patient's body to better adapt after the operation and using the device, reducing the probability of postoperative complications, and improving the patient's comfort and the overall effect of surgical treatment.

[0053] In an alternative embodiment of the present embodiment, preferably, through holes are respectively provided at the hinge joints of two different connecting rods, and the two through holes are connected by PET silk thread to realize the hinge of the two different connecting rods. This connection method not only ensures that the connecting rods can rotate flexibly to realize the expansion and contraction function of the umbrella rib bracket, but also has a certain connection strength, further enhancing the stability of the umbrella rib bracket structure.

[0054] In an alternative embodiment of the present embodiment, preferably, the materials of the fixed seat 2, the sliding seat 12 and all the connecting rods are titanium. Titanium has the advantages of good biocompatibility, high strength and corrosion resistance. Selecting titanium as the material can ensure that the umbrella rib bracket works stably in the human body for a long time, is not prone to problems such as deformation and corrosion, and ensures the overall stability of the device.

[0055] In an alternative embodiment of the present embodiment, preferably, a handle 15 is further fixedly provided on the bone cement injection tube 3, and the handle 15 is close to the second end of the bone cement injection tube 3. A handle 14 is further fixedly provided at one end of the umbrella bone push tube 13 away from the umbrella bone bracket. The handle 14 is threadedly connected to the handle 15. The handle 15 is fixedly provided on the bone cement injection tube 3 near its second end, which is convenient for medical staff to hold and operate the injection tube to inject bone cement. A handle 14 is fixedly provided at one end of the umbrella bone push tube 13 away from the umbrella bone bracket, and the handle 14 is threadedly connected to the handle 15, so that when operating, medical staff can drive the axial movement of the umbrella bone push tube 13 by rotating the handle 14, making it more convenient and accurate to push the sliding seat 12, facilitating the control of the expansion and contraction of the umbrella bone bracket and the position and state of the entire device in the vertebral body, and improving the convenience and operability of medical staff in operating the device.

[0056] The specific usage method of the vertebral body forming bone cement filling device in this embodiment is as follows:

[0057] I. Establish a working channel

[0058] There are two methods in this step, and both need to be operated under the fluoroscopy of a C-arm or an X-ray machine:

[0059] Method 1:

[0060] Select a φ4.0 puncture needle and accurately insert it into the collapsed vertebral body through the pedicle;

[0061] After the insertion is completed, carefully remove the needle core from the puncture needle, and thus the establishment of the working channel is completed;

[0062] Method 2:

[0063] First, use a φ3.0 puncture needle and slowly enter the collapsed vertebral body through the pedicle;

[0064] After the puncture needle enters in place, remove the needle core, and then insert the guide needle into it;

[0065] Subsequently, slowly insert the working cannula together with the dilator along the guide needle into the vertebral body;

[0066] Finally, pull out the guide needle and the dilator, and successfully complete the establishment of the working channel;

[0067] II. Drilling operation (if a biopsy is required)

[0068] Insert the drill bit into the collapsed vertebral body through the established working cannula;

[0069] If a biopsy is required for this operation, a disposable bone sampler can be selected to complete the corresponding operation;

[0070] During the whole operation process, real-time observation shall be carried out with the aid of X-rays to ensure the accuracy of the operation;

[0071] After the drill bit drills to the preset required depth, carefully remove the drill bit from the working sleeve;

[0072] III. Placing and using the balloon

[0073] Pass the balloon through the working channel and accurately place it at the position of the vertebral body compression, and then inflate the balloon to make it gradually expand. Through the expansion of the balloon, the collapsed vertebral body is propped up to promote the restoration of part of the vertebral body height;

[0074] After the vertebral body height is restored to a certain extent, carefully withdraw the balloon from the vertebral body;

[0075] IV. Installing and expanding the umbrella bone bracket of the device

[0076] Detachably connect the bone cement injection tube 3 of the device to the umbrella bone bracket. After the connection is completed, slowly send it into the collapsed vertebral body along the working channel established before;

[0077] After the umbrella bone bracket is sent into the vertebral body, ensure that the head of the mesh bag 1 of the umbrella bone bracket is accurately placed at the center position of the damaged part of the vertebral body;

[0078] Then, push the umbrella bone push tube 13 so that the limit step abuts against the sliding seat 13, thereby pushing the sliding seat 12 towards the fixed seat 2 to expand the mesh bag 1 of the umbrella bone bracket; during this process, the sharp corner 11 on the umbrella bone bracket is inserted into the cross-section of the cortical bone defect, forming a ratchet-like effect, thereby effectively preventing the umbrella bone bracket from deforming in the reverse direction;

[0079] V. Injecting bone cement

[0080] Remove the plug 16, and then connect the bone cement injection tube 3 to the bone cement injector. Inject bone cement into the collapsed vertebral body along the bone cement injection tube 3 through the bone cement injector. It should be noted that the bone cement injection port is arranged on the side of the injection tube. This circumferential discharging method can avoid the direct action of the pressure during bone cement injection on the inner cavity of the collapsed vertebral body and ensure the uniform distribution of the bone cement in the vertebral body;

[0081] After the bone cement is injected, when the pressure reaches 10 atm, about 0.5 mm of bone cement leaks out. As Figure 4 shown, the leaked bone cement 17 forms a microscopic interlock with the spine, so that the outer umbrella surface of the mesh bag can be relatively closely attached to the spine.

[0082] VI. Post-treatment of the device

[0083] After the bone cement injection is completed, the bone cement injection tube 3 is separated from the umbrella bone bracket. Specifically, by rotating the bone cement injection tube 3, the bone cement injection tube 3 is no longer threadedly connected to the fixed seat 2, and then the bone cement injection tube 3 and the umbrella bone push tube 13 are pulled out together. Since the limiting step on the umbrella bone push tube 13 is located on the side of the sliding seat 12 away from the fixed seat 2, the limiting step will not hinder the extraction of the umbrella bone push tube 13. At this time, the umbrella bone bracket will remain in the collapsed vertebral body;

[0084] The umbrella bone bracket remaining in the vertebral body will continue to play a role in supporting the collapsed vertebral body in the later stage by combining its own sharp corners 11 to maintain the shape and stability of the vertebral body.

[0085] Specific examples are used in the present invention to illustrate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A vertebral body shaping bone cement filling device, characterized in that: include: A mesh bag, wherein the mesh bag is woven with 106D (±3D) multifilaments, and the number of single filaments of the multifilaments is ≥42F; An umbrella rib bracket, wherein the umbrella rib bracket is arranged in the net bag; the umbrella rib bracket comprises a fixed seat, a sliding seat and a plurality of shrinking and expanding mechanisms, the fixed seat is coaxial with the sliding seat; each of the shrinking and expanding mechanisms comprises six connecting rods, namely a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a fifth connecting rod and a sixth connecting rod, the first end of the first connecting rod is hinged to the fixed seat, and the second end is slidably matched with the second connecting rod, the first end of the second connecting rod is hinged to the sliding seat, and the second end is hinged to the fourth connecting rod, the first end of the third connecting rod is hinged to the first connecting rod, and the second end is hinged to the first end of the fourth connecting rod, the second end of the fourth connecting rod is hinged to the sixth connecting rod, the first end of the fifth connecting rod is hinged to the second connecting rod, and the second end is hinged to the first end of the sixth connecting rod, the second end of the sixth connecting rod is fixed with a sharp corner, and the tip of the sharp corner faces the direction away from the first end of the sixth connecting rod; the net bag is connected to the second end of each of the sixth connecting rods by a connecting line; A bone cement injection tube, wherein the first end of the bone cement injection tube is used to be detachably connected to an end of the fixing seat close to the sliding seat, the second end of the bone cement injection tube is provided with a plug, and the side wall of the bone cement injection tube is provided with a plurality of bone cement injection holes, and the bone cement injection holes are close to the fixing seat; An umbrella rib push tube, wherein the umbrella rib push tube is slidably sleeved on the bone cement injection tube, the sliding seat is annular and slidably sleeved on the umbrella rib push tube, and a limiting step is arranged on the umbrella rib push tube, the limiting step can abut against one end of the sliding seat away from the fixed seat, and the sliding seat is located between the fixed seat and the limiting step.

2. The vertebral body shaping bone cement filling device according to claim 1, characterized in that: All the hinge axes in the same contraction and expansion mechanism are parallel to each other.

3. The vertebral body shaping bone cement filling device according to claim 1, characterized in that: All of the contraction and expansion mechanisms are evenly distributed along the circumference of the fixing seat.

4. The vertebral body shaping bone cement filling device according to claim 1, characterized in that: A sliding groove is provided in the middle of the second connecting rod, and the second end of the first connecting rod is slidably matched with the sliding groove.

5. The vertebral body shaping bone cement filling device according to claim 1, characterized in that: The connecting wire is made of PET thread.

6. The vertebral body shaping bone cement filling device according to claim 1, characterized in that: Two different connecting rods are respectively provided with through holes at the mutually hinged positions, and the two through holes are connected by PET threads to realize the hinged connection of the two different connecting rods.

7. The vertebral body shaping bone cement filling device according to claim 1, characterized in that: The material of the fixed seat, the sliding seat and all the connecting rods is titanium.

8. The vertebral body shaping bone cement filling device according to claim 1, characterized in that: The bone cement injection tube is also fixedly provided with a handle, and the handle is close to the second end of the bone cement injection tube.

9. The vertebral body shaping bone cement filling device according to claim 8, characterized in that: A handle is also fixedly provided on one end of the umbrella rib push tube away from the umbrella rib bracket.

10. The vertebral body shaping bone cement filling device according to claim 9, characterized in that: The handle is threadedly connected to the handle.

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