CN220442721U - Vertebral body implantation device utilizing memory elastic expansion - Google Patents

Abstract

The utility model belongs to the technical field of vertebral body surgical tools, and discloses a vertebral body implantation device utilizing memory elastic expansion, wherein a mesh bag is sleeved outside a bracket, the left end and the right end of the mesh bag are of non-deformable rigid structures, and the middle end of the mesh bag is of a deformable flexible structure; the right end of the mesh bag is connected with an outer tube, a first channel of the outer tube is arranged in the middle of the outer tube, and a middle sleeve is movably sleeved in the first channel of the outer tube; the right end of the outer tube is fixedly provided with a connector, and the right end of the middle sleeve passes through the middle of the connector and is connected with a luer connector. The utility model provides a cavity into which bone filler is injected, so that the risk of leakage of the bone filler is greatly reduced, the injection pressure of the bone filler is greatly reduced, and the bone filler can be better anchored in a vertebral body; avoiding the retraction of the cavity into which the bone filler is injected, better recovering and ensuring the physiological height of the vertebral body; the supporting function of the bracket effectively avoids the retraction of the cavity and ensures the recovery of the physiological height of the vertebral body.

Description

Vertebral body implantation device utilizing memory elastic expansion

Technical Field

The utility model belongs to the technical field of vertebral body surgical tools, and particularly relates to a vertebral body implantation device utilizing memory elastic expansion.

Background

At present, vertebral compression fracture caused by osteoporosis is frequently generated in the elderly, and patients suffering from the disease are rapidly increasing as the population ages. Current surgical treatments are percutaneous vertebroplasty (percutaneous vertebroplasty, PVP), percutaneous kyphoplasty (percutaneous kyphoplasty, PKP) new bone capsular bag filling vertebroplasty (Vesselplasty). The three operations have the common points that bone fillers (common bone cements such as acrylic resin bone cement, calcium phosphate bone cement and hydroxyapatite composite bone cement) are injected into the vertebral body by means of external force so as to achieve the effects of repairing the height of the vertebral body, enhancing the strength and stability of the vertebral body and relieving the pain of the waist and back of a patient, thereby treating the vertebral body compression fracture caused by osteoporosis. These three procedures all have drawbacks, as will be described one by one.

In PVP surgery, the conventional surgical steps are:

(1) Inserting the puncture needle into the vertebral body, then pulling out the inner tube of the puncture needle, and leaving the outer tube of the puncture needle in the vertebral body;

(2) Inserting a guide wire along the outer tube of the puncture needle, and pulling out the outer tube of the puncture needle;

(3) Inserting the expander into the vertebral body along the guide wire, respectively pulling out the guide wire and the inner tube of the expander, and leaving the outer tube of the expander in the vertebral body to form a channel for injecting bone filler;

(4) Inserting a bone drill along the outer tube of the expander, rotating the bone drill to drill holes, and then pulling out the bone drill, wherein the outer tube of the expander is left in the vertebral body;

(5) Injecting a bone filler into the vertebral body along the outer tube of the dilator;

(6) And withdrawing the outer tube of the dilator after the bone filler injection is completed.

Compression fracture of the vertebral body can cause the vertebral body to generate cracks, injected bone filler cannot be immediately solidified, and when the fluidity is high, the bone filler can enter tissues near the vertebral body along the cracks of the vertebral body, and the phenomenon is called bone filler leakage. Bone filler leakage can produce side effects such as necrosis of surrounding bone, bone filler syndrome in the human body, etc. The biggest disadvantage of PVP technique is that bone filler leakage easily occurs, and the probability of bone filler leakage can be as high as more than 80%. Second, the injection pressure of the bone filler is also high.

In PKP surgery, the conventional surgical steps are:

(1) Inserting the puncture needle into the vertebral body, then pulling out the inner tube of the puncture needle, and leaving the outer tube of the puncture needle in the vertebral body;

(2) Inserting a guide wire along the outer tube of the puncture needle, and pulling out the outer tube of the puncture needle;

(3) Inserting the expander into the vertebral body along the guide wire, respectively pulling out the guide wire and the inner tube of the expander, and leaving the outer tube of the expander in the vertebral body to form a channel for injecting bone filler;

(4) Inserting a bone drill along the outer tube of the expander, rotating the bone drill to drill holes, and then pulling out the bone drill, wherein the outer tube of the expander is left in the vertebral body to form a channel for injecting bone filler;

(5) Connecting a pressure pump to the balloon, performing evacuation operation on the balloon, inserting the balloon into the vertebral body along the outer tube of the expander, operating the pressure pump to expand the balloon, then operating the pressure pump to shrink the balloon, and extracting the balloon;

(6) Injecting a bone filler into the vertebral body along the outer tube of the dilator;

(7) And withdrawing the outer tube of the dilator after the bone filler injection is completed.

PKP is also a procedure in which a bone filler injection channel is first established, as is PVP. Then the balloon is used for expanding to form a cavity, the balloon is withdrawn, bone filler is injected, and finally the instrument is withdrawn. PKP surgery adds a procedure to the balloon compared to PVP surgery. After the saccule enters the vertebral body, the saccule expands to push away bone, and after the saccule is withdrawn, a cavity is formed in the vertebral body. The cavity greatly reduces the injection pressure of the bone filler and thus the risk of leakage of the bone filler is reduced. Secondly, the spongy bone around the cavity is compacted due to the fact that the spongy bone is pushed away by the saccule, and leakage of bone filler can be effectively prevented. However, the disadvantage is that after balloon withdrawal, the retraction of the cavity is detrimental to the injection of bone filler and the restoration of the vertebral body to a level not expected due to the lack of a supporting cavity.

There is another surgical approach, new bone capsular bag filling vertebroplasty (vesselplay), which, unlike PVP and PKP procedures, involves more capsular bags (or mesh bags). In this procedure, the procedure of creating a channel for bone filler injection is consistent with PVP and PKP procedures. The capsular bag is then inserted into the vertebral body along the outer tube of the expander, the instrument is withdrawn after the bone filler is injected, and the bone filler and capsular bag remain in the vertebral body. The bag is made of polymer woven fabric and is provided with a plurality of small holes. One of the advantages of the pouch is that it controls the outflow of bone filler, effectively preventing the bone filler from leaking. The second advantage is that the small holes allow better integration of the bone filler with cancellous bone after outflow, and the larger surface area of the bone filler enables better anchoring of the entire device in the vertebral body. The disadvantage is that the lack of a balloon-forming procedure as in PKP, ultimately, the restoration of the vertebral body is not high enough.

Aiming at the problems in the three techniques, a vertebral body implantation device which can be flexibly used, is convenient to operate and has small side effect and utilizes memory elastic expansion is needed.

Through the above analysis, the problems and defects existing in the prior art are as follows: in the vertebral compression fracture operation, the bone filler is easy to leak, the injection of the bone filler is not facilitated, and the recovery height of the vertebral body is insufficient.

Disclosure of Invention

Aiming at the problems existing in the prior art, the utility model provides a vertebral body implantation device which utilizes memory elastic expansion.

The present utility model is achieved by providing a vertebral body implant device using memory elastic expansion, provided with:

a mesh bag and a bracket;

the net bag is sleeved outside the bracket, the left end and the right end of the net bag are rigid structures which are not deformable, the middle end of the net bag is a deformable flexible structure;

the right end of the mesh bag is connected with an outer tube, a first channel of the outer tube is arranged in the middle of the outer tube, and a middle sleeve is movably sleeved in the first channel of the outer tube;

the right end of the outer tube is fixedly provided with a connector, and the right end of the middle sleeve passes through the middle of the connector and is connected with a luer connector.

Further, the pocket left end is provided with pocket left end first round hole, and the pocket middle-end is provided with pocket middle-end first cavity, and the pocket right-hand member is provided with pocket right-hand member first round hole, pocket right-hand member second round hole and pocket right-hand member boss, and the accommodation space of placing the support is constituteed to pocket left end first round hole, pocket middle-end first cavity, pocket right-hand member first round hole and pocket right-hand member second round hole.

Further, the outer tube is tubular structure, and outer tube left end is provided with the outer tube recess with pocket right-hand member boss complex, and the pocket right-hand member boss is inserted and is established in outer tube recess.

Further, the support is in a grid structure or a spiral structure, and the whole support is made of a memory alloy material.

Further, the inside of the connector is provided with a first connector channel, a second connector channel and a third connector channel from left to right in sequence, the inner diameter of the first connector channel is slightly larger than the outer diameter of the outer tube, the outer wall of the outer tube is adhered to the inner wall of the first connector channel, the inner diameter of the second connector channel is slightly larger than the outer diameter of the middle sleeve, the middle sleeve is movably sleeved on the inner side of the second connector channel, and the inner diameter of the third connector channel is larger than the inner diameter of the second connector channel.

Further, the right end of the connector is provided with a connector boss matched with the middle sleeve assembly, and the upper side and the lower side of the connector are respectively provided with a connector handle.

Further, well sleeve pipe is tubular structure, is provided with well sleeve pipe round hole in the well sleeve pipe, is provided with well sleeve pipe screw thread in the middle of the well sleeve pipe, and well sleeve pipe screw thread cooperates with the internal thread that sets up on the first round hole of pocket right-hand member, and well sleeve pipe screw thread left side is provided with well sleeve pipe step, well sleeve pipe step and support contact.

Further, the luer connector is provided with a luer connector first round hole, a luer connector bottom surface, a luer connector thread and a luer connector second round hole, the luer connector first round hole is bonded with the middle sleeve and fixed, the luer connector thread is used for being connected with a bone filler injector, and the bone filler injector enables bone filler to enter the inside of the mesh bag along the luer connector second round hole and the middle sleeve round hole respectively.

In combination with the technical scheme and the technical problems to be solved, the technical scheme to be protected has the following advantages and positive effects:

first, aiming at the technical problems in the prior art and the difficulty of solving the problems, the technical problems solved by the technical proposal of the utility model are analyzed in detail and deeply by tightly combining the technical proposal to be protected, the results and data in the research and development process, and the like, and some technical effects brought after the problems are solved have creative technical effects. The specific description is as follows:

the utility model provides a vertebral body implantation device which can restore the height of a vertebral body, reduce the leakage of bone filler, enable the bone filler to be better anchored in the vertebral body, has simple operation and reduces the operation risk and utilizes memory elastic expansion.

Compared with PVP (polyvinyl pyrrolidone) surgery, the cavity for injecting the bone filler is provided, so that the risk of leakage of the bone filler is greatly reduced, the injection pressure of the bone filler is greatly reduced, and the bone filler can be better anchored in a vertebral body;

compared with PKP (bone cement paste) operation, the retraction of the cavity injected with bone filler is avoided, and the physiological height of the vertebral body is better recovered and ensured;

compared with Vesselplasty, the support function of the support effectively avoids retraction of the cavity and ensures recovery of the physiological height of the vertebral body. A cavity into which bone filler is injected is provided, reducing the injection pressure of the bone filler.

The mesh bag coating of the vertebral body implantation device can prevent the bone filler from leaking and avoid tissue damage near the vertebral body.

Secondly, the technical proposal is regarded as a whole or from the perspective of the product, the technical scheme to be protected has the technical effects and advantages as follows:

from a product perspective, a relatively perfect product is provided, the disadvantages of PVP, PKP and Vesselplasty are overcome, and doctors and patients are benefited.

The utility model can better anchor the bone filler in the vertebral body, has simple operation, greatly reduces the risk of leakage of the bone filler, avoids the retraction of the cavity injected by the bone filler, and ensures the recovery of the physiological height of the vertebral body.

Drawings

FIG. 1 (a) is a schematic view of a vertebral implant device utilizing memory elastic expansion according to an embodiment of the present utility model;

FIG. 1 (b) is a schematic cross-sectional view of a vertebral body implant device utilizing memory elastic expansion according to an embodiment of the present utility model;

FIG. 2 (a) is a schematic view of the structure of the mesh bag according to the embodiment of the present utility model when the mesh bag is contracted;

fig. 2 (b) is a schematic structural diagram of the mesh bag according to the embodiment of the present utility model when the mesh bag is opened;

FIG. 2 (c) is a schematic cross-sectional view of a bag according to an embodiment of the present utility model

FIG. 3 (a) is a schematic view of a structure of a stent according to an embodiment of the present utility model when the stent is contracted;

fig. 3 (b) is a schematic structural diagram of a stent according to an embodiment of the present utility model when the stent is opened;

FIG. 4 (a) is a schematic structural view of an outer tube assembly according to an embodiment of the present utility model;

FIG. 4 (b) is a schematic cross-sectional view of an outer tube assembly provided by an embodiment of the present utility model;

FIG. 5 (a) is a schematic structural diagram of a middle sleeve assembly according to an embodiment of the present utility model;

FIG. 5 (b) is a schematic cross-sectional view of a middle sleeve assembly according to an embodiment of the present utility model;

FIG. 6 (a) is a cross-sectional view of a stent according to an embodiment of the present utility model when contracted;

FIG. 6 (b) is a partial schematic view of the mesh bag when the stent is contracted according to the embodiment of the present utility model;

FIG. 6 (c) is a cross-sectional view of a stent according to an embodiment of the present utility model when expanded;

FIG. 6 (d) is a partial schematic view of the mesh bag when the stent is expanded according to the embodiment of the present utility model;

FIG. 7 (a) is a cross-sectional view of a stent according to an embodiment of the present utility model when contracted;

FIG. 7 (b) is a partial schematic view of the mesh bag when the stent is contracted according to the embodiment of the present utility model;

FIG. 7 (c) is a cross-sectional view of a stent according to an embodiment of the present utility model when expanded;

FIG. 7 (d) is a partial schematic view of the mesh bag when the stent is opened according to the embodiment of the present utility model;

in the figure: 1. a vertebral body implantation device; 11. a mesh bag; 111. the left end of the net bag; 1111. the left end of the net bag is provided with a first round hole; 112. the middle end of the net bag; 1121. a first cavity at the middle end of the net bag; 113. the right end of the net bag; 1131. the right end of the net bag is provided with a first round hole; 1132. the second round hole is formed in the right end of the mesh bag; 1133. a boss at the right end of the net bag; 12a, a bracket; 12b, a bracket; 2. a connecting tube assembly; 21. an outer tube assembly; 211. an outer tube; 2111. an outer tube groove; 2112. an outer tube first passage; 212. a joint; 2121. a joint first passage; 2122. a joint second channel; 2123. a joint third channel; 2124. a joint boss; 2125. a joint handle; 22. a middle sleeve assembly; 221. a middle sleeve; 2211. a middle sleeve round hole; 2212. a middle sleeve step; 2213. middle sleeve threads; 222. a luer fitting; 2221. a luer fitting first round hole; 2222. a luer fitting bottom surface; 2223. luer fitting threads; 2224. luer fitting second round hole.

Detailed Description

The present utility model will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

In order to fully understand how the utility model may be embodied by those skilled in the art, this section is an illustrative embodiment in which the claims are presented for purposes of illustration.

Example 1

As shown in fig. 1 (a) and 1 (b), the vertebral body implant device using memory elastic expansion according to the embodiment of the present utility model includes a vertebral body implant device 1 and a connection tube assembly 2. The vertebral body implant device 1 comprises a mesh bag 11 and a bracket (bracket 12a or bracket 12 b), which are a main body structure for being spread in the vertebral body, providing a receiving cavity for bone filler, and finally remaining in the vertebral body. The connecting tube assembly 2 includes an outer tube assembly 21 and a middle cannula assembly 22, which are auxiliary structures for assisting the vertebral body implant device 1 in entering the vertebral body, distracting the vertebral body implant device 1, and providing an injection passage for bone filler. The bone filler may be acrylic resin bone cement, calcium phosphate bone cement, or hydroxyapatite composite bone cement.

As shown in fig. 2, the mesh bag 11 is divided into a left end 111, a middle end 112, and a right end 113, wherein the left end 111 and the right end 113 are rigid structures, and the middle end 112 is flexible structures.

The left end 111 of the mesh bag is provided with a first round hole 1111 at the left end of the mesh bag, which is a hollow structure and provides a receiving space for the bracket (the bracket 12a or the bracket 12 b). The first circular hole 1111 at the left end of the mesh bag is communicated with the hollow structure of the middle end 112 of the mesh bag. The left end 111 of the mesh bag can be made of metal materials such as stainless steel, titanium alloy and the like.

The bag-in-end 112 is provided with a bag-in-end first cavity 1121. The middle end 112 of the mesh bag is woven by polymer and is in a revolving structure, and two ends are respectively fixed with the left end 111 and the right end 113 of the mesh bag, so that a first cavity 1121 of the middle end of the mesh bag is formed. The middle end 112 of the mesh bag is soft and can deform due to the adoption of a polymer braided fabric structure, so that the mesh bag can be changed from the contracted state of fig. 2 (a) to the expanded state of fig. 2 (b); and the slit therein enables the bone filler to flow outwardly from the first cavity 1121 at the mid-end of the mesh bag. The mesh bag middle end 112 presents a quadrilateral mesh shape, and the mesh of the mesh bag middle end 112 is not drawn for convenience in the following description of the principles of the present patent. The mesh bag middle end 112 can be made of PET material, and the mesh number of the mesh bag can be 80+/-10 meshes so as to control the outflow amount of bone filling.

The right end 113 of the mesh bag is provided with a first circular hole 1131 at the right end of the mesh bag, and is provided with internal threads. The right end 113 of the mesh bag is also provided with a second round hole 1132 at the right end of the mesh bag. The second circular hole 1132 at the right end of the mesh bag is identical to the inner diameter of the first circular hole 1111 at the left end of the mesh bag, and both provide a receiving space for the bracket (bracket 12a or bracket 12 b). The right end 113 of the mesh bag is further provided with a boss 1133 at the right end of the mesh bag, which cooperates with the outer tube 211 to prevent the mesh bag 11 and the outer tube 211 from rotating relatively. The first circular hole 1111 at the left end of the mesh bag, the first hollow cavity 1121 at the middle end of the mesh bag, the first circular hole 1131 at the right end of the mesh bag and the second circular hole 1132 at the right end of the mesh bag provide a complete accommodating space for the bracket (bracket 12a or bracket 12 b). The right end 113 of the mesh bag is identical in material to the left end 111 of the mesh bag.

As shown in fig. 3 (a) and 3 (b), there are two types of brackets, the bracket 12a on the left side and the bracket 12b on the right side. The support 12a is in a grid structure, the stent 12b has a spiral structure.

The bracket 12a and the bracket 12b are integrally made of memory alloy material, and the material can be nickel-titanium alloy. The phase transition temperature of the stents 12a and 12b is 36 c and the hysteresis zone temperature is 20 c, i.e. the stents 12a and 12b become elastic when the temperature exceeds 36 c, capable of providing a supporting force, and the stents will start to soften when the ambient temperature drops from above 36 c to 16 c, i.e. will not shrink again once the stents are deployed in the body. The stents 12a and 12b are in a soft state when not in use, and body temperature triggers the stents 12a and 12b to open.

Fig. 4 (a) and 4 (b) are schematic structural views of the outer tube assembly 21, including the outer tube 211 and the joint 212:

the outer tube 211 has a tubular structure, and an outer tube groove 2111 is provided at the left end thereof for cooperating with a boss 1133 at the right end of the mesh bag 11, so that the outer tube 211 and the mesh bag 11 cannot rotate relatively. The outer tube 211 is further provided with an outer tube first channel 2112, the inner diameter of which is slightly larger than the outer diameter of the middle sleeve 221, the middle sleeve 221 is movable within the outer tube first channel 2112. The outer tube 211 may be made of stainless steel.

Three working channels are provided in the joint 212, namely a joint first channel 2121, a joint second channel 2122 and a joint third channel 2123. The inner diameter of the joint first passage 2121 is slightly larger than the outer diameter of the outer tube 211, and the two are joined together by bonding. The inner diameter of the fitting second passage 2122 is slightly larger than the outer diameter of the middle sleeve 221, the middle sleeve 221 is movable and rotatable within the joint second channel 2122. The joint third passage 2123 enables movement and rotation of the middle sleeve assembly 22. Fitting 212 also has a fitting boss 2124 provided thereon for mating with the middle sleeve assembly 22. The connector 212 is also provided with a connector handle 2125 for easy gripping. The joint 212 may be made of PC material.

As shown in fig. 5, the middle sleeve assembly 22 consists of a middle sleeve 221 and a luer fitting 222:

the middle sleeve 221 has a tubular structure and is provided with a middle sleeve round hole 2211 for providing a conveying channel for bone filler. The middle part is provided with a middle sleeve thread 2213 which is matched with the inner thread arranged on the first round hole 1131 at the right end of the mesh bag, so that the middle sleeve 221 and the mesh bag 11 can rotate relatively. A middle sleeve step 2212 is provided on the left side of the middle sleeve thread 2213 in contact with the bracket 12b. The middle sleeve 221 may be made of stainless steel.

Luer 222 is provided with luer first circular bore 2221, luer bottom surface 2222, luer threads 2223, and luer second circular bore 2224. Luer first bore 2221 is bonded to and secured to middle cannula 221. Luer bottom surface 2222, when it is in contact with the right side of connector boss 2124 (fig. 4 (b)), intermediate sleeve assembly 22 is not rotatable any further into mesh bag 11. The luer connector threads 2223 are used to connect with a bone filler injector that will cause bone filler to enter the interior of the mesh bag 11 along the luer connector second bore 2224 and the middle cannula bore 2211, respectively. The luer 222 may be a PC material.

Before using the vertebral body implantation device using memory elastic expansion, a channel should be established for the vertebral body implantation device using memory elastic expansion, and the steps (1) - (4) of PVP operation in the background technology are not repeated here. The vertebral body implant device 1 in the contracted state (fig. 1 (a)) using memory elastic expansion is then left-hand vertebral body implant device passed along the channel into the vertebral body. The vertebral body implant device 1 is now still in a contracted state, as shown in fig. 6 (a) and 6 (b).

As shown in fig. 6 (a), both the mesh bag 11 and the holder 12a are in a contracted state. Since the vertebral body implant device 1 has been introduced into the vertebral body, the stent 12a will gradually expand under the influence of the body temperature. The stent 12a is fully expanded, and at this time, the stent 12a is fully expanded, and the mesh bag 11 is also expanded as the stent 12a is deformed, as shown in fig. 6 (c) and 6 (d). The whole bracket 12a is made of memory alloy material and is spread under the influence of human body temperature. A cavity is formed in the middle of the holder 12a, and at this time, after the bone filler injector is connected to the luer thread 2223 (fig. 5 b), the bone filler is injected leftward (in the arrow direction of fig. 5 b) along the middle sleeve 221, and the bone filler can be injected while rotating the middle sleeve 221 counterclockwise, so that the bone filler is uniformly distributed in the mesh bag 11. The bone filler can flow out along the slit of the mesh bag 11 but not out of the vertebral body. Since the middle sleeve 221 is rotated continuously counterclockwise during this process, the outer tube 211 can be withdrawn together with the middle sleeve 221 when the middle sleeve 221 and the mesh bag 11 are no longer screwed. When the bone filler is completely solidified, the mesh bag 11 and the scaffold 12a are in the bone filler.

And the bracket 12b operates differently than the bracket 12 a. As shown in fig. 7 (a), both the mesh bag 11 and the holder 12b are in a contracted state. The middle sleeve 221 is matched with the inner thread on the first round hole 1131 at the right end of the net bag through the middle sleeve thread 2213. Both ends of the bracket 12b are respectively contacted with the first round hole 1111 at the left end of the mesh bag and the middle sleeve step 2212.

The middle sleeve 221 is also rotated by holding the connector handle 2125 with one hand and rotating the luer connector 222 clockwise with the other hand, and the middle sleeve 221 moves leftwards due to the threaded engagement of the middle sleeve 221 with the mesh bag 11, the middle sleeve step 2212 pushes the right end of the support 12b to move leftwards, and the support 12b is gradually spread due to the influence of body temperature. When the middle sleeve 221 is rotated to a certain position (fig. 7 (c) and (d)), the bottom surface 2222 of the luer connector is contacted with the connector boss 2124, and the middle sleeve 221 can not rotate clockwise any more due to the limit function of the connector boss 2124, at this time, the right end of the bracket 12b enters the second round hole 1132 at the right end of the mesh bag, the bracket 12b is fully opened, and the mesh bag 11 is opened by the bracket 12b. The bracket 12 does not shrink due to the spacing of the first circular hole 1111 at the left end of the mesh bag and the second circular hole 1132 at the right end of the mesh bag. At this time, after the bone filler injector is connected to the luer thread 2223 (fig. 5 b), the bone filler is injected leftward (in the arrow direction of fig. 7 d) along the middle sleeve 221, and the bone filler can be injected while rotating the middle sleeve 221 counterclockwise, so that the bone filler is uniformly distributed in the mesh bag 11. The bone filler can flow out along the slit of the mesh bag 11 but not out of the vertebral body. Since the middle sleeve 221 is rotated continuously counterclockwise during this process, the outer tube 211 can be withdrawn together with the middle sleeve 221 when the middle sleeve 221 and the mesh bag 11 are no longer screwed. When the bone filler is completely solidified, the mesh bag 11 and the scaffold 12b are in the bone filler.

The bone filler is combined with cancellous bone after flowing out through the mesh bag, so that the whole device can be better anchored in the vertebral body, the stability of the vertebral body is improved, and fracture is not generated any more. The device greatly improves the safety and effectiveness of the operation.

In order to prove the inventive and technical value of the technical solution of the present utility model, this section is an application example on specific products or related technologies of the claim technical solution.

The embodiment of the utility model has a great advantage in the research and development or use process, compared with the prior art, the embodiment of the utility model has great advantages, and the following is described with reference to data, charts and the like in the experimental process.

This patent has the practicality, and is specific as follows:

in the design process, the structure is designed according to clinical application and combination practice. Because the key structure is a bracket, the mechanical type structure is adopted, and the similar structure has application in life.

The choice of materials is also combined with clinical application, and the materials selected are all available in the art.

In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like are used merely for convenience in describing the present utility model and to simplify the description by referring to the figures, rather than to indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The foregoing is merely illustrative of specific embodiments of the present utility model, and the scope of the utility model is not limited thereto, but any modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present utility model will be apparent to those skilled in the art within the scope of the present utility model.

Claims (8)

1. A vertebral body implantation device using memory elastic expansion, characterized in that the vertebral body implantation device using memory elastic expansion is provided with:

a mesh bag and a bracket;

the net bag is sleeved outside the bracket, the left end and the right end of the net bag are of non-deformable rigid structures, and the middle end of the net bag is of a deformable flexible structure;

the right end of the mesh bag is connected with an outer tube, a first channel of the outer tube is arranged in the middle of the outer tube, and a middle sleeve is movably sleeved in the first channel of the outer tube;

the right end of the outer tube is fixedly provided with a connector, and the right end of the middle sleeve passes through the middle of the connector and is connected with a luer connector.

2. The vertebral implant device according to claim 1, wherein the left end of the mesh bag is provided with a first circular hole at the left end of the mesh bag, the middle end of the mesh bag is provided with a first hollow hole at the middle end of the mesh bag, the right end of the mesh bag is provided with a first circular hole at the right end of the mesh bag, a second circular hole at the right end of the mesh bag and a boss at the right end of the mesh bag, and the first circular hole at the left end of the mesh bag, the first hollow hole at the middle end of the mesh bag, the first circular hole at the right end of the mesh bag and the second circular hole at the right end of the mesh bag form a containing space for placing the support.

3. The vertebral body implant device of claim 2, wherein the outer tube has a tubular structure, the left end of the outer tube is provided with an outer tube groove which is matched with a boss at the right end of the mesh bag, and the boss at the right end of the mesh bag is inserted into the outer tube groove.

4. The vertebral body implant device of claim 1, wherein the stent is a lattice structure or a spiral structure.

5. The vertebral implant device of claim 1 wherein the first joint passage, the second joint passage and the third joint passage are sequentially provided from left to right in the joint, the inner diameter of the first joint passage is slightly larger than the outer diameter of the outer tube, the outer wall of the outer tube is bonded with the inner wall of the first joint passage, the inner diameter of the second joint passage is slightly larger than the outer diameter of the middle sleeve, the middle sleeve is movably sleeved on the inner side of the second joint passage, and the inner diameter of the third joint passage is larger than the inner diameter of the second joint passage.

6. The vertebral body implant device of claim 5, wherein the right end of the joint is provided with a joint boss for being matched with the middle sleeve assembly, and the upper side and the lower side of the joint are respectively provided with a joint handle.

7. The vertebral body implant device of claim 1, wherein the middle sleeve has a tubular structure, a middle sleeve circular hole is formed in the middle sleeve, a middle sleeve thread is arranged in the middle of the middle sleeve, the middle sleeve thread is matched with an internal thread arranged on a first circular hole at the right end of the mesh bag, a middle sleeve step is arranged at the left side of the middle sleeve thread, and the middle sleeve step is in contact with the support.

8. The vertebral body implant device of claim 1 wherein the luer connector is provided with a luer connector first circular hole, a luer connector bottom surface, luer connector threads and a luer connector second circular hole, the luer connector first circular hole is bonded and fixed with the middle sleeve, the luer connector threads are used for connecting with a bone filler injector, and the bone filler injector enables bone filler to enter the inside of the mesh bag along the luer connector second circular hole and the middle sleeve circular hole respectively.