TWM618320U - Spinal shoving elastic device - Google Patents

Abstract

An elastic device for vertebral expansion, comprising a supporting unit, comprising a fixed body and at least one expansion element, the fixed body has a sliding through hole, the expansion element has at least one connecting portion and an expansion portion, and the expansion element is coupled to the connecting portion A fixed body; and an elastic element, which is slidably disposed in the sliding through hole and has the freedom to move along the length of the sliding through hole, the elastic element has at least one support portion and a sliding portion, and the height of the support portion is greater than The height of the sliding part corresponds to the hole diameter of the sliding through hole. When the elastic element slides toward the expansion part, the support part expands the expansion part to the outside of the supporting unit. This creation can be used to prop up the lumbar spine and cervical spine, and can also be used to expand and support the bones to facilitate the injection of bone cement to strengthen the bones.

Description

Spinal extension elastic device

This creation is related to a spinal implant device, especially a spinal distraction elastic device that can avoid excessive pressure on the stretched bones.

The average life expectancy of modern people continues to increase, and various tissues in the body naturally degenerate. The spine is the largest nerve channel of the human body. The various pains caused by the aging of the intervertebral disc are already very common symptoms of aging in modern society. If the intervertebral disc has been seriously aging, the current mainstream treatment is the use of intervertebral fusion cages for intervertebral fusion surgery. However, there is a type of conventional intervertebral fusion cages that cannot be adjusted in height. This type of intervertebral fusion cage usually requires Other tools can be inserted before opening the vertebrae; there are other intervertebral fusion cages that can be placed between the vertebrae and then open the vertebrae. Most of the strength requirements are made of titanium alloy. In the case of long-term pressure on the spine, the user's spine may collapse and cause other problems.

In addition, when it is necessary to pour bone cement into the bone to strengthen the bone, if only a hole is drilled in the bone, since most of the bone to be strengthened is already osteoporotic, the drilled hole is easily collapsed and cannot maintain the complete shape, making the bone cement It does not fill the bones smoothly, and requires additional device assistance.

In view of this, the creator has accumulated many years of research and practical experience in related fields, and specially created a spinal expansion elastic device to improve the lack of the above-mentioned conventional technology.

The main purpose of this creation is to provide a spinal expansion elastic device that can avoid excessive pressure on the spine, and use more elastic elastic elements to expand the expansion elements instead of hard metal elements, which can reduce the pressure on the spine; This creation can also be used for drilling holes to stabilize bones to facilitate the filling of bone cement.

To achieve the above purpose, the spine expansion elastic device of the present invention includes a supporting unit, which includes a fixed body and at least one expansion element, the fixed body has a sliding through hole, and the expansion element has at least one connecting portion and an expanding portion, The expansion element is combined with the fixed body by the connecting part; and an elastic element, which is slidably disposed in the sliding through hole and has the freedom to move along the length of the sliding through hole, and the elastic element has at least one support portion and a sliding movement The height of the supporting part is greater than the height of the sliding part. The height of the sliding part corresponds to the aperture of the sliding through hole. When the elastic element slides toward the expansion part, the supporting part of the elastic element expands the expansion part to the outside of the supporting unit to support The unit can stretch the vertebrae. If you need to take out this creation, just slide the elastic element in the opposite direction, and the expansion element will collapse to reduce the height of this creation, making this creation easier to remove than the conventional fixed-height spinal fusion cage.

The elastic element can be an element made of polyether ether ketone (PEEK). Compared with a titanium alloy, the elastic element made of PEEK deforms slightly when it is pressed by the vertebrae, so as to avoid the creation of excessive pressure on the vertebrae. Each part of the fixed body can be made of a non-biologically toxic titanium alloy, or a titanium alloy combined with a part of PEEK material to reduce weight. The number of the supporting parts can be two and they are respectively arranged at the two ends of the elastic element, so that the sliding part is arranged at the center of the elastic element.

The expansion element can be combined with a surface of the fixed body that is not provided with a sliding through hole. The extension direction of the expansion part is parallel to the direction in which the sliding through hole penetrates the fixed body. The extension direction of the connecting part is parallel to the length extension direction of the sliding through hole. The thickness of one end of the part is greater than the one end of each connecting part combined with the fixed body and extends inwardly. The expansion element may be in the shape of a "U" with two connecting parts and an expansion part, and the expansion element is connected to the fixed body by the connecting parts respectively. The number of expansion elements can be two, and each expansion element is respectively connected to one of the two faces of the fixed body that are not provided with a sliding through hole and are opposite to each other. The distance between one end of each connection part and the expansion part is smaller than that of each connection part and the fixed body The distance between one end, the height of the support part is greater than the distance between one end of each connecting part and the expansion part.

When only a single expansion element is used, the expansion element can be located in the center of the fixed body and be elongated, the support part of the elastic element can be arranged in the center, and the number of sliding parts can be two and can be respectively arranged at both ends of the elastic element, sliding The through hole can have an installation opening for the elastic element to enter the sliding through hole on a surface opposite to the expansion element, and each sliding portion can respectively have an inclined surface for the elastic element to enter the installation opening. When the elastic element moves in the direction of the expansion part, the support part will push the expansion part to expand to the outside of the support unit 1.

The expansion element can have a plurality of concavo-convex textures on the outside, and the fixed body can have a plurality of concavo-convex textures on the side where the expansion element is combined and the opposite side thereof. The uneven textures can increase the friction between the creation and the vertebrae and allow the growth of cells to fix the creation. The fixed body can be tapered at one end close to each expansion part, which is convenient for putting the creation into the human body.

The sliding through hole can have a mounting part and a sliding part. The aperture of the mounting part corresponds to the size of the support part of the elastic element. The aperture of the sliding part corresponds to the height of the sliding part of the elastic element, so that the elastic element slides from the mounting part into the sliding through hole. And slide on the sliding part, the aperture of the sliding part can be smaller than the aperture of the mounting part.

The fixed body may have an operating through hole at one end close to each connecting part, and the operating through hole is connected to the sliding through hole. The extension direction of the operating through hole is the same as the length of the sliding through hole. The inner side of the operating through hole may have a thread for operation. The user can move the elastic element by operating the through hole with a tool after the creation is placed in the human body.

This creation can also be used to drill holes for expanding bones to facilitate the filling of bone cement. A filling hole is drilled before the bone needs to be filled with bone cement for reinforcement, and then a suitable size of this creation is built into the filling hole, and then the elastic element is operated. When the expansion element is opened, the filling hole will not be in danger of collapsing, and the bone cement can be easily filled into the bone.

In order to be able to clearly and fully expose the creation, examples of preferred implementations are listed to illustrate the implementation in detail as described later.

Please refer to the first to fifth figures, which reveal the drawings of the implementation of this creation. The above drawings illustrate the embodiment (1) of the spine distraction elastic device of this creation, which includes a support unit 1, which includes a fixed The main body 10 and at least one expansion element 11, the fixed main body 10 has a sliding through hole 12, the expansion element 11 has at least one connecting portion 111 and an expansion portion 112. In this embodiment (1), the expansion element 11 is in the shape of a U and has two connections Portion 111 and an expansion portion 112, the expansion portion 112 is connected to the end of the connecting portion 111 that is not connected to the fixed body 10, the expansion element 11 is connected to both sides of the fixed body 10 by the connecting portion 111, and the expansion portion 112 and the connecting portion 111 are respectively adjacent In the sliding through hole 12, the expansion element 11 is combined with the fixed body 10 on a side of the fixed body 10 without the sliding through hole 12, the extension direction of the expansion portion 112 is parallel to the direction in which the sliding through hole 12 penetrates the fixed body 10, and the extension direction of each connecting portion 111 is parallel In the direction in which the length of the sliding through hole 12 extends, each connecting portion 111 of the expansion element 11 is located on one of the opposite sides of the movable through hole 12, and the thickness of one end of each connecting portion 111 combined with the expanding portion 112 is greater than that of each connecting portion 111. One end of the fixed body 10 extends to the inner side of the support unit 1. In the present embodiment (1), the sliding through hole 12 penetrates the fixed body 10 from the side of the fixed body 10, and the length of the sliding through hole 12 is the same as the length of the fixed body 10. Same direction; and

An elastic element 2 slidably disposed in the sliding through hole 12 to have the freedom to move along the length of the sliding through hole 12. The elastic element 2 has at least one supporting portion 21 and a sliding portion 22. The supporting portion 21 The height is greater than the height of the sliding portion 22, and the height of the sliding portion 22 corresponds to the aperture of the sliding through hole 12. The number of the supporting parts 21 can be two and they are respectively arranged at the two ends of the elastic element 2, so that the sliding part 22 is arranged at the center of the elastic element 2.

The number of expansion elements 11 in this embodiment (1) is two, and each expansion element 11 is respectively coupled to one of two faces of the fixed body 10 that are not provided with a sliding through hole 12 and are opposite to each other. For example, each expansion element 11 is respectively coupled to The top surface and the bottom surface of the fixed body 10, the thickness of one end of each connecting portion 111 of each expansion element 11 combined with the expansion portion 112 is greater than that of one end of each connecting portion 111 combined with the fixed body 10 and extends to the inner side of the supporting unit 1, because each connecting portion The increased thickness of 111 extends toward the inner side of the support unit 1, so that the distance between one end of each connecting portion 111 and the expansion portion 112 is smaller than the distance between one end of each connecting portion 111 and the fixed body 10, and the height of the support portion 21 is greater than that of each connecting portion 111 Combine the distance between one end of the expansion portion 112. The distance between the connecting portions 111 of the two expansion elements 11 and one end of the fixed body 10 can correspond to the height of the support portion 21, so that when the elastic element 2 is away from the expansion portion 112 as shown in the first and second figures, the expansion element 11 and The fixed body 10 is flat. This creation can also use only a single expansion element 11 to achieve a single direction of expansion.

In this embodiment (1), the distance between the expansion elements 11 is the largest at one end of each connecting portion 111 combined with the fixed body 10, which facilitates the installation of the elastic element 2, and then the distance between the expansion elements 11 gradually decreases with the direction of each expansion portion 112. Small, meaning that the thickness of each connecting portion 111 gradually increases toward the inner side of each expansion portion 112; in this embodiment, the distance between the expansion elements 11 is roughly divided into three stages, and the distance between the first stage is greater than that of the support portion 21 The height between the second stage and the corresponding support part 21 allows the elastic element 2 to not open the expansion elements 11, and the distance between the third stage is smaller than the height of the support part 21 so that the elastic element can open the expansion elements 11, Between each stage can be a smooth curve rise. That is, the thickness of each connecting portion 111 is roughly divided into three stages. The first stage is the thinnest, allowing the elastic element 2 to be easily installed; the second stage has a thickness that allows the support portion 21 to lean against each connecting portion 111 without spreading the expansion elements 11 ; The third stage is the thickest. When each support portion 21 of the elastic element 2 slides toward each expansion portion 112, each support portion 21 will push the thickest part of each connection portion 111, so that each expansion portion 112 faces the supporting unit 1 Lateral expansion. The thickness of each connecting portion 111 and the height of the supporting portion 21 can be adjusted according to the user's condition, and the height of the creation can be changed to match the user's physical condition; for example, the thickness of each connecting portion 111 or the supporting portion can be reduced The height of 21 can reduce the height of the original creation, and vice versa, it will increase the height of the original creation.

In the present embodiment (1), the sliding through hole 12 has a mounting portion 121 and a sliding portion 122. The aperture of the mounting portion 121 corresponds to the size of the supporting portion 21 of the elastic element 2, and the aperture of the sliding portion 122 corresponds to the sliding portion of the elastic element 2. The size of 22 allows the mounting portion 121 of the elastic element 2 to slide into the mounting portion 121 of the sliding through hole 12 from the side of the fixed body 10 to install the elastic element 2, and the elastic element 2 is then slid in the sliding through hole 12 by the sliding portion 22 The portion 122 slides, and the aperture of the sliding portion 122 can be smaller than the aperture of the mounting portion 121. In the present embodiment (1), each supporting portion 21 is shaped as a rounded quadrilateral to avoid rolling and deviating from the position due to the pressure of the spine, so the mounting portion 121 can be roughly rounded square. One end of each connecting portion 111 combined with each expansion portion 112 can be flat and plateau-shaped, matching the rounded quadrangular shape of each supporting portion 21, to prevent the elastic element 2 from retreating under the pressure of the spine and causing each expansion element 11 to retract; The outer diameter of 21 is larger than the sliding portion 122, and the elastic element 2 cannot move laterally when the sliding portion 122 is in the position, so the elastic element 2 will not accidentally slip out of the sliding through hole 12 at the sliding portion 122. The position of the mounting portion 121 can correspond to the first-stage pitch of the aforementioned connecting portions 111, and the position of the sliding portion 122 corresponds to the second-stage and the third-stage pitch of the aforementioned connecting portions 111, so that the elastic element 2 is at the second-stage pitch. The sliding through hole 12 will not slide out from the side.

In this embodiment (1), the fixed body 10 has an operating through hole 13 at one end close to each connecting portion 111, the operating through hole 13 is connected to the sliding through hole 12, and the extending direction of the operating through hole 13 is the length extending direction of the sliding through hole 12 Similarly, there can be a thread on the inside of the operating through hole 13, allowing the surgeon to use an insertion tool to push the elastic element 2 through the operating through hole 13 after the creation is inserted into the human body; for example, a screw (not drawn) can be used as The insertion tool is screwed in through the operating through hole 13, and with the rotation of the screw (not drawn), the elastic element 2 is pushed to move toward the expansion portion 112, and the expansion elements 11 are expanded to the outside of the support unit 1; and the elastic element 2 faces the operation One side of the through hole 13 can have a locking groove (not drawn), the locking groove (not drawn) can also have a thread, the diameter of the locking groove (not drawn) can be smaller than the operating through hole 13, when the elastic element 2 needs to be pulled back, you can A removal tool with a thread corresponding to the locking groove (not drawn) at the end is inserted through the operating through hole 13 and screwed with the locking groove (not drawn), and then the removal tool is moved to pull the elastic element 2 back to close each expansion Element 11. In this embodiment (1), the back cover 15 has a back cover hole 151 corresponding to the operating through hole 13 to allow the aforementioned insertion tool and removal tool to pass.

The elastic element 2 can be made of polyether ether ketone (PEEK) or made of other non-biotoxic polymer materials. When the elastic element 2 made of PEEK stretches the vertebrae, it will be pressed by the vertebrae. Slightly deform to avoid excessive pressure on each vertebra in this creation. If you use different materials, you can fine-tune the pressure on each vertebra in this creation. If the elastic element 2 is made of titanium alloy and other metal materials, the elastic element 2 is under pressure The opposing force generated at this time is relatively large, and each expansion portion 112 may be embedded in the adjacent vertebrae, causing damage to the vertebrae.

The fixed body 10 can be tapered at one end close to each expansion portion 112, which is convenient for putting the creation into the human body. Each part of the fixed body 10 can be made of a non-biologically toxic titanium alloy, or a titanium alloy combined with a part of PEEK material to reduce weight; in this embodiment (1), the fixed body 10 and the expansion element 11 are used to support the vertebrae. Titanium alloy material is integrally formed and manufactured, and the fixed body 10 is combined with a tapered head section 14 and a back cover 15. The tapered head section 14 and the back cover 15 can be made of PEEK material to reduce weight. Therefore, this embodiment (1) The middle fixed body 10 is roughly cross-shaped when viewed from above. The movable through hole 12 is provided at the center of the cross. Each connecting portion 111 is connected to the two arms of the cross. It can be stretched by the elastic element 2. Both sides of the fixed body 10 and the rear cover 15 are hollowed out respectively to reduce weight. In this embodiment (1), the back cover 15 has a back cover hole 151 corresponding to the operation through hole 13. The fixed body 10, the expansion element 11, the tapered head section 14 and the back cover 15 can also be manufactured in one piece.

In this embodiment (1), each expansion element 11 has a plurality of concavo-convex textures on the outer side, and the fixed body 10 can have a plurality of concavo-convex textures on the two surfaces where each expansion element 11 is combined; each concavo-convex texture can increase the friction between the creation and the vertebrae. Power and for cell growth to fix the original creation. If only a single expansion element 11 is used, the fixed body 10 can have a plurality of concave and convex textures on the side where the expansion element 11 is combined and the opposite side thereof.

In the fourth and fifth figures, since the distance between the connecting portions 111 of the two expansion elements 11 and one end of the expansion portion 112 is smaller than the height of the support portion 21, when the elastic element 2 moves toward each expansion portion 112, the elastic element 2 The supporting part 21 will be clamped between the thickest part of each connecting part 111, and each connecting part 111 and each expanding part 112 will be expanded to the outside of the supporting unit 1. Each supporting unit 1 can hold each vertebra (such as lumbar vertebra A) And cervical vertebra A1) propped up. If there is a need to take out the creation, just move the elastic element 2 in the opposite direction, and the expansion elements 11 will collapse to reduce the height of the creation, making this creation easier to remove than the conventional fixed-height spinal fusion cage. If only a single expansion element 11 is used, each support portion 21 of the elastic element 2 will push the thickest part of each connection portion 111 to expand each expansion portion 112 to the outside of the support unit 1.

In the sixth and seventh figures, it can be seen that the present creation can be inserted between the two lumbar vertebrae A before the expansion, and then the elastic element 2 is operated to expand the expansion element 11 to support each lumbar vertebra A. As can be seen in the eighth and ninth pictures, two smaller books can be used in pairs, or a larger one can be placed diagonally depending on the status of the user.

As can be seen in the tenth picture, this creation can also be used to stabilize the drilling of lumbar vertebra A to facilitate the filling of bone cement. A filling hole A2 is drilled before the lumbar vertebra A needs to be filled with bone cement for reinforcement, and then the filling hole A2 is drilled. The entry hole A2 is inserted into the present creation of a suitable size, and then the elastic element 2 is operated to expand the expansion elements 11. With this creation supporting in the filling hole A2, the filling hole A2 will not have the risk of collapse. It can be easily filled with bone cement into the lumbar vertebra A for reinforcement. This creation can also be used to strengthen the cervical vertebra A1 or Drill holes in other parts of the bone to fill in bone cement.

In the eleventh to the twelfth figure, you can see the embodiment (2) of this creation, which only uses a single expansion element 11 and is located in the center of the top surface of the fixed body 10, which is expanded in the embodiment (2) The element 11 is elongated, and the fixed body 10 has a ring-shaped structure so that the expansion element 11 can move up and down in the fixed body 10. In this embodiment (2), the sliding through hole 12 penetrates the fixed body 10 from the side of the fixed body 10. The support part 21 of the elastic element 2 is provided in the center, the number of the sliding parts 22 is two and they are respectively provided at both ends of the elastic element 2, and the sliding through hole 12 is on a surface opposite to the expansion element 11 (in this embodiment (2) The middle is the bottom surface) has a mounting opening 16 for the elastic element 2 to enter the sliding through hole 12. In this embodiment (2), the mounting opening 16 has a widened portion 161, and the shape of the widened portion 161 corresponds to the shape of each sliding portion 22, And each sliding portion 22 has an inclined surface 221 for the elastic element 2 to enter the installation opening 16 (in this embodiment (2), the inclined surface 221 is provided at the top of each sliding portion 22), so that the elastic element 2 is easier to install; When installing the elastic element 2 into the sliding through hole 12, the inclined surfaces 221 can be aligned with the widened portion 161, and then the elastic element 2 can be inserted into the mounting opening 16 to enter the sliding through hole 12, and the supporting portion 21 can lean against at this time Expanding the connecting portion of the element 11, the elastic element 2 can move in the sliding through hole 12 with each sliding portion 22.

In Figure 13, when the embodiment (2) of the present creation is in use, the elastic element 2 is also moved in the direction of the expansion portion 112, and the support portion 21 will push the expansion portion 112 to the outside of the support unit 1. expansion. In the second embodiment, the thickness between the connecting portion 111 and the expansion portion 112 is smoothly thickened rather than in stages, and the side of the support portion 21 facing the expansion portion 112 may also have a corresponding smooth slope to allow the support portion 21 to expand. The flow of the expansion part 112 is smoother and does not get stuck. In the second embodiment, the elastic element 2 can still be moved in the aforementioned manner through the operating through hole 13 so that the surgeon can operate the second embodiment to expand or retract.

In the fourteenth figure, you can see that the embodiment (2) of this creation is used to support the cervical vertebra A1. Because the cervical vertebra A1 and the lumbar vertebra A are operated in different directions, the direction of this creation in the fourteenth figure is It is different from the sixth and seventh pictures.

However, the above are only the preferred embodiments of this creation, and should not be used to limit the scope of implementation of this creation. Any obvious changes and modifications that can be made by those who are accustomed to this industry should be regarded as not deviating from it. The essence of this creation.

1: Support unit 10: Fixed body 11: Expansion element 111: Connection 112: Expansion 12: Sliding through hole 121: Installation Department 122: Sliding part 13: Operation through hole 14: Cone head section 15: back cover 151: Rear cover hole 16: Installation port 161: Widening 2: Elastic element 21: Support 22: Sliding part 221: Slope A: Lumbar vertebrae A1: Cervical vertebra A2: Fill in the hole

The first picture is a three-dimensional view of the creative embodiment (1) before being expanded. The second picture is another angle of the first picture. The third picture is an exploded view of the first picture. The fourth figure is a three-dimensional view of the creative embodiment (1) after being expanded. The fifth picture is another angle of the fourth picture. The sixth figure is a schematic diagram (1) of the creative embodiment (1). The seventh figure is a schematic diagram (two) of the creative embodiment (1). The eighth figure is a schematic diagram (3) of the creative embodiment (1). The ninth figure is a schematic diagram (four) of the creative embodiment (1). The tenth figure is a schematic diagram (5) of the creative embodiment (1). The eleventh picture is a three-dimensional view of the creative embodiment (2) before being expanded. The twelfth picture is the bottom view of the eleventh picture. The thirteenth picture is a three-dimensional view of the creative embodiment (2) after being expanded. The fourteenth figure is a schematic diagram of the use of the creative embodiment (2).

1: Support unit

10: Fixed body

11: Expansion element

111: Connection

112: Expansion

12: Sliding through hole

121: Installation Department

122: Sliding part

13: Operation through hole

14: Cone head section

15: back cover

2: Elastic element

Claims (10)

An elastic device for spine distraction, which includes: A support unit, comprising a fixed body and at least one expansion element, the fixed body has a sliding through hole, the expansion element has at least one connection part and an expansion part, the expansion element is combined with the fixed body by the connection part; and An elastic element that is slidably disposed in the sliding through hole and has the freedom to move along the direction of the length of the sliding through hole. The elastic element has at least one support portion and a sliding portion, and the height of the support portion is greater than The height of the sliding portion and the height of the sliding portion correspond to the aperture of the sliding through hole, so that when the elastic element slides toward each expansion portion, the support portion of the elastic element moves the expansion portion toward the outside of the support unit expansion. The spine distracting elastic device according to claim 1, wherein the expansion element is in the shape of a U and has two connecting parts and an expansion part, the expansion element is connected to the fixed body by each of the connection parts, and the expansion element is connected to the The fixed body is not provided with a surface of the sliding through hole, the extension direction of each expansion portion is parallel to the direction in which the sliding through hole penetrates the fixed body, and the extension direction of each connecting portion is parallel to the direction in which the length of the sliding through hole extends. The thickness of one end of the connecting portion combined with the expansion portion is greater than that of the one end of each connecting portion combined with the fixed body and extends toward the inner side of the supporting unit. The spine expansion elastic device according to claim 2, wherein the number of the expansion elements is two, and each expansion element is respectively coupled to one of the two faces of the fixed body that are not provided with the sliding through hole and are opposite to each other, each The distance between one end of the connecting portion and the expansion portion is smaller than the distance between the end of each connecting portion and the fixed body, and the height of the support portion is greater than the distance between one end of each connecting portion and the expansion portion. The spine expansion elastic device according to claim 2 or 3, wherein the number of the supporting parts is two and they are respectively arranged at both ends of the elastic element. The spine expansion elastic device according to claim 1, wherein each of the expansion elements has a plurality of concavo-convex textures on the outer side, and the fixed body has a plurality of concavo-convex textures on the two sides where the expansion elements are combined. The spine expansion elastic device according to claim 1, wherein the fixed body is tapered at one end close to each expansion part. The spine expansion elastic device according to claim 1, wherein the elastic element is an element made of polyether ether ketone (PEEK). The spine expansion elastic device according to claim 1, wherein the sliding through hole has a mounting part and a sliding part, the aperture of the mounting part corresponds to the size of the support part of the elastic element, and the aperture of the sliding part corresponds to the elasticity The height of the sliding part of the component. The spine expansion elastic device according to claim 1, wherein the fixed body has an operating through hole at one end close to each of the connecting portions, the operating through hole communicates with the sliding through hole, and the extending direction of the operating through hole is the same as the sliding through hole. The length of the through hole extends in the same direction, and the inner side of the operating through hole has a thread. The spine expansion elastic device according to claim 1, wherein the fixed body has a ring-shaped structure, the expansion element is elongated, the expansion element is coupled to the center of the fixed body by the connecting portion, and the sliding through hole is opposite to There is an installation opening on one side of the expansion element for the elastic element to enter the sliding through hole, the support part of the elastic element is arranged in the center, the number of the sliding parts is two and they are respectively arranged at both ends of the elastic element, each The sliding portion respectively has an inclined surface for the elastic element to enter the installation opening.

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