CN108670394B - A bone expansion structure - Google Patents

Abstract

The present invention discloses a bone expansion structure, which relates to the field of medical technology. The bone expansion structure comprises a first elastic expansion member and a second elastic expansion member. The second elastic expansion member is located on a side of the first elastic expansion member away from a preset axis, and the bone expansion structure is configured to have a compression state and an expansion state under the elastic force of the first elastic member and the second elastic member. The bone expansion structure can effectively expand and support the vertebral body, and can absorb the stress generated by the compression between the vertebral bodies.

Description

A bone expansion structure

Technical Field

The present invention relates to the field of medical technology, in particular to a bone expansion structure.

Background technique

Percutaneous vertebroplasty (PVP) is a minimally invasive spinal surgery technique that injects bone cement into the vertebral body through the pedicle or outside the pedicle to increase the strength and stability of the vertebral body, prevent collapse, relieve pain, and even partially restore the height of the vertebral body. Percutaneous kyphoplasty (PKP) is developed on the basis of percutaneous vertebroplasty.

However, the existing bone fillers used in percutaneous vertebroplasty and percutaneous kyphoplasty have a single structure and cannot effectively provide filling support.

Summary of the invention

The object of the present invention is to provide a bone expansion structure, which can effectively expand and support the vertebral bodies and absorb the stress generated by compression between the vertebral bodies.

The embodiment of the present invention is achieved as follows:

A bone expansion structure, comprising:

A first elastic expansion member, the first elastic expansion member comprises:

a first elastic member, a plurality of first elastic members are sequentially connected around a preset axis, and a plurality of first elastic members are sequentially connected around a preset axis.

A filling space is defined between the elastic members and passes through the end surface of the first elastic expansion member; and

The second elastic expansion member includes:

A second elastic member, wherein a plurality of second elastic members are sequentially connected around a preset axis;

The second elastic expansion member is located on a side of the first elastic expansion member away from the preset axis, and the bone expansion structure is constructed to have the following characteristics under the elastic force of the first elastic member and the second elastic member:

In the compressed state, the plurality of first elastic members and the plurality of second elastic members move closer to the preset axis; and

In the expanded state, the plurality of first elastic members and the plurality of second elastic members expand in a direction away from the preset axis and the volume of the filled space increases.

The inventor has designed the above-mentioned bone expansion structure, which can effectively support the vertebral body, enhance the strength and stability of the vertebral body, and absorb the extrusion force of the vertebral body. The bone expansion structure includes a first elastic expansion member and a second elastic expansion member. Among them, the first elastic expansion member includes a plurality of first elastic members, and is formed by connecting and surrounding the plurality of first elastic members in sequence around a preset axis, and the second elastic expansion member includes a plurality of second elastic members, and is formed by connecting and surrounding the plurality of second elastic members in sequence around a preset axis. Among them, both the first elastic member and the second elastic member are elastic, and through their elastic force, the bone expansion structure has two states, namely, a compression state and an expansion state. Specifically, when the bone expansion structure is in a compression state, the plurality of first elastic members and the plurality of second elastic members move closer to the preset axis. When the bone expansion structure is in an expansion state, the plurality of first elastic members and the plurality of second elastic members expand in a direction away from the preset axis and an expansion cavity is formed between the plurality of first elastic members, which passes through the opposite ends of the first elastic expansion member. At this time, it can be clearly known that the volume of the bone expansion structure in the compression state is smaller than that of the bone expansion structure in the expansion state. When the bone expansion structure is actually used, the bone expansion structure in a compressed state is transported to the human vertebral body through a puncture device. When the bone expansion structure reaches the vertebral body, the bone expansion structure is controlled so that the bone expansion structure is transformed into an expanded state. The expanded first elastic member and the second elastic member expand and support the vertebral body, and fillers are implanted into the filling space. Due to the effect of the filler and the elastic force, the bone expansion structure can effectively fill and support the vertebral body and enhance the strength and stability of the vertebral body. Furthermore, the bone expansion structure expands the vertebral body through its own deformation to achieve vertebral body reduction and long-term stable support effects. The bone expansion structure itself is an elastic body with resilience and can absorb the stress generated when the vertebral body is squeezed.

In one embodiment of the present invention:

On the cross section of the first elastic expansion member, a plurality of first elastic members are centrally symmetrically distributed around a preset axis;

On the cross section of the second elastic expansion member, a plurality of second elastic members are centrally symmetrically distributed around a preset axis.

In one embodiment of the present invention:

When the bone expansion structure is in a compressed state, the wall surface of the second elastic member close to the preset axis is closely attached to the wall surface of the first elastic member;

When the bone expansion structure is in the expanded state, a gap exists between the wall surface of the second elastic member close to the preset axis and the first elastic member.

In one embodiment of the present invention:

The first elastic member includes an elastic strip and a connecting member;

The elastic strip has a first end and a second end opposite to each other along the extension direction of the preset axis;

A plurality of connecting members are respectively arranged on two side surfaces opposite to the first end and two side surfaces opposite to the second end;

Two adjacent elastic strips are connected via a connecting piece.

In one embodiment of the present invention:

Two connecting members are respectively arranged on two opposite side surfaces of the first end, and the two connecting members extend obliquely from the first end to the second end;

The first elastic members are symmetrically arranged along the midline of the elastic strip.

In one embodiment of the present invention:

When the bone expansion structure is in an expanded state, the elastic strip is in a meandering shape and has an outward expansion section and an inward depression section in a rotational manner along the extension direction of the preset axis, the outward expansion section abuts against the second elastic member, and there is a gap between the inward depression section and the second elastic member;

When the bone expansion structure is in a compressed state, the first elastic expansion member is cylindrical.

In one embodiment of the present invention:

When the bone expansion structure is in an expanded state, the elastic strip is in a meandering shape and has an outward expansion section, an inward depression section and an outward expansion section in sequence along the extension direction of the preset axis.

In one embodiment of the present invention:

The second elastic member includes a connecting elastic portion and a filling portion;

The connecting elastic part has a third end and a fourth end opposite to each other along the extension direction of the preset axis, the connecting elastic part has a hollow hole inside, the filling part is located in the hollow hole, the opposite ends of the filling part are respectively connected to the third end and the fourth end, and there is a gap between the filling part and the inner wall of the hollow hole;

The side wall of the connecting elastic part has a connecting point, two adjacent connecting elastic parts are connected through the connecting point, the third end is in contact with the first end, and the fourth end is in contact with the second end.

In one embodiment of the present invention:

The connecting elastic part includes two sub-elastic parts, the two sub-elastic parts are mirror-symmetrical, and the sub-elastic parts are provided with a plurality of connection points at intervals along the direction of the preset axis;

When the bone expansion structure is in an expanded state, the sub-elastic member has a bracket segment away from the filling portion and a concave segment close to the filling portion in a series of turns along the direction of the preset axis, and the bracket segment defines a connection point;

When the bone expansion structure is in a compressed state, the two sub-elastic members move closer to each other.

In one embodiment of the present invention:

The outer contour of the filling part corresponds to the sub-elastic member, and a through hole is opened in the corresponding bracket section of the filling part.

The technical solution of the present invention has at least the following beneficial effects:

The present invention provides a bone expansion structure, which can effectively expand and support the vertebral bodies and absorb the stress generated by compression between the vertebral bodies.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

FIG1 is a schematic structural diagram of a bone expansion structure in Example 1 of the present invention at a first viewing angle;

FIG2 is a schematic structural diagram of the bone expansion structure in Example 1 of the present invention at a second viewing angle;

FIG3 is a schematic structural diagram of the first elastic expansion member in Embodiment 1 of the present invention at a first viewing angle;

FIG4 is a schematic structural diagram of the first elastic expansion member in Embodiment 1 of the present invention at a second viewing angle;

FIG5 is a schematic structural diagram of the second elastic expansion member in Embodiment 1 of the present invention at a first viewing angle;

FIG. 6 is a schematic structural diagram of the second elastic expansion member in Embodiment 1 of the present invention at a second viewing angle.

Icons: 10-bone expansion structure; 11-first elastic expansion member; 12-second elastic expansion member; 71-third end; 72-fourth end; 73-bracket section; 74-recessed section; 81-first end; 82-second end; 83-outward expansion section; 84-inward recessed section; 90-filling space; 110-first elastic member; 120-second elastic member; 1100-elastic strip; 1101-connecting member; 1200-connecting elastic part; 1201-filling part.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition and explanation in the subsequent drawings.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inner", "lower", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invented product is usually placed when in use, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the present invention, unless otherwise clearly specified and limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being above, above, and above a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

Example 1

This embodiment provides a bone expansion structure 10, which can effectively expand and support the vertebral bodies and absorb the stress generated by compression between the vertebral bodies.

Please refer to FIG. 1 and FIG. 2 . FIG. 1 shows the specific structure of the bone expansion structure 10 in this embodiment at a first viewing angle, and FIG. 2 shows the specific structure of the bone expansion structure 10 in this embodiment at a second viewing angle.

The bone expansion structure 10 includes a first elastic expansion member 11 and a second elastic expansion member 12. It should be noted that, in the present embodiment, the bone expansion structure 10 includes the first elastic expansion member 11 and the second elastic expansion member 12. In other specific embodiments, the bone expansion structure 10 may also include a third elastic expansion member and a fourth elastic expansion member, etc., where "third" and "fourth" are intended to explain that the bone expansion structure 10 is a multi-layer structure.

It should be noted that when the bone expansion structure 10 is used, its effect is to expand the vertebral body through its own deformation, so as to achieve vertebral body reduction and long-term stable support effect, and the bone expansion structure 10 itself is an elastic body, which has the resilience to absorb the stress generated when the vertebral body is squeezed.

3 and 4 , FIG. 3 shows the specific structure of the first elastic expansion member 11 in the present embodiment at a first viewing angle, and FIG. 4 shows the specific structure of the first elastic expansion member 11 in the present embodiment at a second viewing angle.

The first elastic expansion member 11 includes a first elastic member 110, and a plurality of first elastic members 110 are sequentially connected around a preset axis, and a filling space 90 penetrating the end surface of the first elastic expansion member 11 is defined between the plurality of first elastic members 110. It should be noted that the preset axis is not shown in the figure.

Please refer to FIG. 5 and FIG. 6 . FIG. 5 shows the specific structure of the second elastic expansion member 12 in the present embodiment at a first viewing angle, and FIG. 6 shows the specific structure of the second elastic expansion member 12 in the present embodiment at a second viewing angle.

The second elastic expansion member 12 includes a second elastic member 120 , and a plurality of second elastic members 120 are sequentially connected around a preset axis. As shown in FIGS. 1 and 2 , the second elastic expansion member 12 is located on a side of the first elastic expansion member 11 away from the preset axis.

It should be noted that the first elastic member 110 and the second elastic member 120 are made of elastic material, and further, they are made of elastic metal. In this embodiment, the first elastic member 110 and the second elastic member 120 are a superelastic nickel-titanium alloy, which can be controlled by temperature to reset the stent deformation.

The bone expansion structure 10 is configured to have a compressed state and an expanded state under the elastic force of the first elastic member 110 and the second elastic member 120, wherein in the compressed state: the plurality of first elastic members 110 and the plurality of second elastic members 120 move closer to the preset axis. In the expanded state: the plurality of first elastic members 110 and the plurality of second elastic members 120 expand in a direction away from the preset axis and the volume of the filling space 90 increases. It should be noted that in the expanded state, the description of the increase in the volume of the filling space 90 is intended to be compared with the volume of the filling space 90 when it is in the compressed state.

FIG. 1 shows the shape of the bone expansion structure 10 in a compressed state, and FIG. 3 and FIG. 5 respectively show the shapes of the first elastic expansion member 11 and the second elastic expansion member 12 in the corresponding compressed states.

FIG. 2 shows the shape of the bone expansion structure 10 in the expanded state, and FIG. 4 and FIG. 6 respectively show the shapes of the first elastic expansion member 11 and the second elastic expansion member 12 in the corresponding expanded states.

Specifically, in this embodiment, on the cross section of the first elastic expansion member 11, a plurality of first elastic members 110 are centrally symmetrically distributed around a preset axis, and on the cross section of the second elastic expansion member 12, a plurality of second elastic members 120 are centrally symmetrically distributed around a preset axis. The centrally symmetrical distribution design is conducive to uniform force on the first elastic member 110 and the second elastic member 120 and improves stability.

Furthermore, when the bone expansion structure 10 is in a compressed state, the wall surface of the second elastic member 120 close to the preset axis is in close contact with the wall surface of the first elastic member 110 .

When the bone expansion structure 10 is in the expanded state, there is a gap between the wall surface of the second elastic member 120 close to the preset axis and the first elastic member 110. Since there is a gap between the second elastic member 120 and the first elastic member 110 in the expanded state, the bone expansion structure 10 has a larger expansion space.

Please refer to FIG. 3 and FIG. 4 , the first elastic member 110 includes an elastic strip 1100 and a connecting member 1101 .

The elastic strip 1100 has a first end 81 and a second end 82 opposite to each other along the extension direction of the preset axis, and a plurality of connecting members 1101 are respectively arranged on two opposite side surfaces of the first end 81 and two opposite side surfaces of the second end 82, and two adjacent elastic strips 1100 are connected by the connecting members 1101. The connecting members 1101 are used to connect two adjacent elastic strips 1100, so that a gap exists between the two adjacent elastic strips 1100, so that each elastic body can expand in its own radial direction in the expanded state, and can be brought together in the compressed state.

Specifically, two connecting members 1101 are respectively disposed on two opposite side surfaces of the first end 81 . The two connecting members 1101 extend obliquely from the first end 81 toward the second end 82 . The first elastic member 110 is symmetrically disposed along the midline of the elastic strip 1100 .

Furthermore, in order to further improve the expansion effect, when the bone expansion structure 10 is in the expansion state, the elastic strip 1100 is in a winding shape and has an outward expansion section 83 and an inward depression section 84 in the extension direction of the preset axis, the outward expansion section 83 abuts against the second elastic member 120, and there is a gap between the inward depression section 84 and the second elastic member 120. When the bone expansion structure 10 is in the compression state, the first elastic expansion member 11 is cylindrical. When the expansion state is changed to the compression state, the length of the elastic strip 1100 in the direction of the preset axis will be longer than that in the compression state. However, when the compression state is changed to the expansion state, the distance between the elastic strip 1100 and the preset axis in the expansion state is greater than that in the compression state, and due to the existence of the outward expansion section 83 and the inward depression section 84, the first elastic expansion member 11 can easily change between the compression state and the expansion state, and due to the existence of the outward expansion section 83 and the inward depression section 84, the outward expansion section 83 can more effectively support the vertebral body to the second elastic expansion member 12.

In this embodiment, when the bone expansion structure 10 is in the expanded state, the elastic strip 1100 is in a meandering shape and has an outward expansion section 83, an inward depression section 84 and an outward expansion section 83 in sequence along the extension direction of the preset axis.

5 and 6 , the second elastic member 120 includes a connecting elastic portion 1200 and a filling portion 1201 .

The connecting elastic part 1200 has a third end 71 and a fourth end 72 relative to each other along the extension direction of the preset axis. The interior of the connecting elastic part 1200 has a hollow hole. The filling part 1201 is located in the hollow hole. The opposite ends of the filling part 1201 are respectively connected to the third end 71 and the fourth end 72. There is a gap between the filling part 1201 and the inner wall of the hollow hole.

The side wall of the connecting elastic part 1200 has a connecting point, and two adjacent connecting elastic parts 1200 are connected through the connecting point, and the third end 71 is fitted with the first end 81, and the fourth end 72 is fitted with the second end 82. By fitting the third end 71 with the first end 81 and the fourth end 72 with the second end 82, the first elastic expansion member 11 and the second elastic expansion member 12 are expanded with their opposite ends (the first end 81 and the third end 71, the fourth end 72 and the second end 82) as the expansion base points, and the part between their end faces is expanded outward, so that the opposite ends are close to each other. It should be noted that, in this embodiment, the third end 71 and the first end 81 are fixed by laser welding, and the fourth end 72 and the second end 82 are also fixed by laser welding. In other specific embodiments, the third end 71 and the first end 81, and the fourth end 72 and the second end 82 can also be connected and fixed by other methods.

It should be noted that two adjacent connecting elastic parts 1200 are connected through a connecting point, that is, there is a gap between the two adjacent connecting elastic parts 1200, so that the two adjacent connecting elastic parts 1200 can be compressed and moved closer to each other, thereby reducing the volume. When expanding outward, the gap between the two adjacent connecting elastic parts 1200 becomes larger.

Specifically, the connecting elastic portion 1200 includes two sub-elastic members, the two sub-elastic members are mirror-symmetrical, and a plurality of connection points are protruded and spaced apart on the sub-elastic members along the direction of the preset axis.

When the bone expansion structure 10 is in an expanded state, the sub-elastic member has a bracket segment 73 away from the filling portion 1201 and a concave segment 74 close to the filling portion 1201 in a direction along a preset axis. The bracket segment 73 defines a connection point. When the bone expansion structure 10 is in a compressed state, the two sub-elastic members are close to each other.

In this embodiment, the sub-elastic member has a bracket segment 73, a concave segment 74 and a bracket segment 73 in sequence along the direction of the preset axis, that is, two adjacent sub-elastic members are connected via two connection points.

In order to enhance the expansion strength in the expanded state and further compress the volume in the compressed state, the outer contour of the filling part 1201 corresponds to the sub-elastic member, and the filling part 1201 is provided with a through hole corresponding to the bracket segment 73. Through the elastic properties of the elastic metal, the through hole of the filling part 1201 can be closed in the compressed state. It should be noted that when the bone expansion structure 10 is in the expanded state, the outer expansion segment 83 abuts against the filling part 1201.

It should be noted that, in this embodiment, the filling space 90 passes through the two opposite end surfaces of the first elastic expander 11 and the second elastic expander 12, and when the bone expansion structure 10 is in an expanded state, the contours of the two openings of the second elastic expander 12 facing the filling space 90 are in a contracted state.

The inventor has designed the above-mentioned bone expansion structure 10, which can effectively expand and support the vertebral body, and can absorb the stress generated by the compression between the vertebral bodies. The bone expansion structure 10 includes a first elastic expansion member 11 and a second elastic expansion member 12. Among them, the first elastic expansion member 11 includes a plurality of first elastic members 110, and is formed by connecting and surrounding the plurality of first elastic members 110 in sequence around a preset axis, and the second elastic expansion member 12 includes a plurality of second elastic members 120, and is formed by connecting and surrounding the plurality of second elastic members 120 in sequence around a preset axis. Among them, the first elastic member 110 and the second elastic member 120 are both elastic, and through their elastic force, the bone expansion structure 10 has two states, namely, a compression state and an expansion state. Specifically, when the bone expansion structure 10 is in a compression state, the plurality of first elastic members 110 and the plurality of second elastic members 120 move closer to the preset axis. When the bone expansion structure 10 is in an expanded state, the plurality of first elastic members 110 and the plurality of second elastic members 120 expand in a direction away from the preset axis and an expansion cavity is formed between the plurality of first elastic members 110 to penetrate the opposite ends of the first elastic expansion member 11. At this time, it can be clearly known that the volume of the bone expansion structure 10 in a compressed state is smaller than that of the bone expansion structure 10 in an expanded state. When the bone expansion structure 10 is actually used, the bone expansion structure 10 in a compressed state is transported to the vertebral body of the human body by a puncture device. When the bone expansion structure 10 reaches the vertebral body, the bone expansion structure 10 is controlled to be converted into an expanded state (in this embodiment, due to the characteristics of the material of the bone expansion structure 10 itself, the expansion can be formed by temperature changes. In other specific embodiments, the bone expansion structure 10 can be controlled to expand by other methods). The expanded first elastic member 110 and the second elastic member 120 expand and support the vertebral body, and fillers are implanted into the filling space 90. Due to the effect of the fillers and elastic force, the bone expansion structure 10 can effectively fill and support the vertebral body. Furthermore, the bone expansion structure 10 expands the vertebral body by its own deformation, thereby achieving vertebral body reduction and long-term stable support effects, and the bone expansion structure 10 itself is an elastic body with resilience to absorb the stress generated when the vertebral body is squeezed.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (8)

1. A bone expansion structure for expanding and supporting the vertebral body of the spine, characterized by comprising: A first elastic expansion member, wherein the first elastic expansion member comprises: A first elastic member, wherein a plurality of the first elastic members are sequentially connected around a preset axis, and a filling space penetrating through an end surface of the first elastic expansion member is defined between the plurality of the first elastic members; and A second elastic expansion member, wherein the second elastic expansion member comprises: A second elastic member, a plurality of the second elastic members are sequentially connected around the preset axis; The second elastic expansion member is located on a side of the first elastic expansion member away from the preset axis, the first elastic member and the second elastic member are nickel-titanium alloy, and the bone expansion structure is constructed to have the following characteristics under temperature changes and under the elastic force of the first elastic member and the second elastic member: In a compressed state, the first elastic members and the second elastic members move closer to the preset axis; and In an expanded state, the plurality of first elastic members and the plurality of second elastic members expand in a direction away from the preset axis and the volume of the filling space increases; Wherein, the first elastic member includes an elastic strip and a connecting member; the elastic strip has a first end and a second end opposite to each other along the extending direction of the preset axis; a plurality of connecting members are respectively arranged on two side surfaces opposite to the first end and two side surfaces opposite to the second end; two adjacent elastic strips are connected by the connecting member; the second elastic member includes a connecting elastic portion and a filling portion; The connecting elastic part has a third end and a fourth end opposite to each other along the extension direction of the preset axis, the connecting elastic part has a hollow hole inside, the filling part is located in the hollow hole, the opposite ends of the filling part are respectively connected to the third end and the fourth end, and there is a gap between the filling part and the inner wall of the hollow hole; the side wall of the connecting elastic part has a connection point, two adjacent connecting elastic parts are connected by the connection point, the third end is in contact with the first end, and the fourth end is in contact with the second end; By fitting the third end to the first end and the fourth end to the second end, the first elastic expansion member and the second elastic expansion member use the opposite ends as expansion base points, and the part between the opposite ends expands outward, so that the opposite ends are close to each other. 2. The bone expansion structure according to claim 1, characterized in that: On the cross section of the first elastic expansion member, a plurality of the first elastic members are centrally symmetrically distributed around the preset axis; In the cross section of the second elastic expansion member, a plurality of the second elastic members are centrally symmetrically distributed around the preset axis. 3. The bone expansion structure according to claim 1, characterized in that: When the bone expansion structure is in the compressed state, the wall surface of the second elastic member close to the preset axis is in close contact with the wall surface of the first elastic member; When the bone expansion structure is in the expanded state, a gap exists between the wall surface of the second elastic member close to the preset axis and the first elastic member. 4. The bone expansion structure according to claim 1, characterized in that: Two connecting members are respectively disposed on two opposite side surfaces of the first end, and the two connecting members extend obliquely from the first end toward the second end; The first elastic members are symmetrically arranged along the midline of the elastic strip. 5. The bone expansion structure according to claim 4, characterized in that: When the bone expansion structure is in the expansion state, the elastic strip is in a meandering shape and has an outward expansion section and an inward depression section in turns along the extension direction of the preset axis, the outward expansion section abuts against the second elastic member, and there is a gap between the inward depression section and the second elastic member; When the bone expansion structure is in the compressed state, the first elastic expansion member is cylindrical. 6. The bone expansion structure according to claim 5, characterized in that: When the bone expansion structure is in the expansion state, the elastic strip is in a meandering shape and has the outward expansion section, the inward depression section and the outward expansion section in sequence along the extension direction of the preset axis. 7. The bone expansion structure according to claim 1, characterized in that: The connecting elastic part comprises two sub-elastic members, the two sub-elastic members are mirror-symmetrical, and the sub-elastic members are provided with a plurality of connecting points at intervals along the direction of the preset axis; When the bone expansion structure is in the expansion state, the sub-elastic member has a bracket segment away from the filling portion and a concave segment close to the filling portion in a direction along the preset axis, and the bracket segment defines the connection point; When the bone expansion structure is in the compressed state, the two sub-elastic members move closer to each other. 8. The bone expansion structure according to claim 7, characterized in that: The outer contour of the filling portion corresponds to the sub-elastic member, and the filling portion is provided with a through hole corresponding to the bracket segment.