CN217938344U - Expansion nail and fixing structure - Google Patents

Abstract

The embodiment of the utility model provides an expansion nail and a fixing structure, wherein the expansion nail comprises a first component and a second component; the first assembly comprises an expansion part and a first abutting part; the second assembly comprises a sliding part and a second abutting part, and the second abutting part is used for abutting against the first abutting part; when the first assembly and the second assembly are embedded in the hole to be fixed, the first abutting part abuts against the second abutting part, the sliding part abuts against the second side wall of the hole to be fixed, and the expansion part and the first side wall of the hole to be fixed form interference fit; wherein the second sidewall is opposite the first sidewall.

Description

Expansion nail and fixing structure

Technical Field

The utility model relates to a medical engineering technical field especially relates to an inflation nail and fixed knot construct.

Background

In daily life, an expansion bolt is usually used and generally comprises an expandable pipe fitting and a self-tapping screw, after the pipe fitting is inserted into a fixture, the self-tapping screw is screwed into the pipe fitting to extrude the pipe fitting, so that the expansion bolt expands, the expansion bolt is clamped in a hole of the fixture, and the expansion bolt and the fixture are fixed. In the bone surgery, the bone needs to be fixed by using the fixing method, but the expansion bolt is generally larger in size, is influenced by the diameter of the bone, and is difficult to drill a hole with a larger diameter on the bone, so that the expansion bolt is difficult to apply in the bone surgery.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides an expansion nail and fixed knot construct has the function of fixing in treating the fixed orifices.

The embodiment of the utility model provides an expansion nail, which comprises a first component and a second component; the first assembly includes an expansion portion and a first abutment portion; the second assembly comprises a sliding part and a second abutting part, and the second abutting part is used for abutting against the first abutting part; when the first assembly and the second assembly are embedded in the hole to be fixed, the first abutting part abuts against the second abutting part, the sliding part abuts against the second side wall of the hole to be fixed, and the expansion part and the first side wall of the hole to be fixed form interference fit; wherein the second sidewall is opposite the first sidewall.

In an embodiment, the first abutting portion includes a plurality of first latches, and the second abutting portion includes a plurality of second latches cooperating with the first latches; when the first assembly and the second assembly are embedded in the hole to be fixed, the first clamping teeth and the second clamping teeth are matched to enable the second assembly to slide relative to the first assembly.

In an embodiment, the first latch and the second latch are selected from one or more of a wedge latch, a zigzag latch, and a curved latch.

In an embodiment, the first assembly is provided with a first unidirectional tooth on the first abutting portion, and the second assembly is provided with a second unidirectional tooth on the second abutting portion, wherein the second unidirectional tooth is matched with the first unidirectional tooth; when the first assembly and the second assembly are embedded in the hole to be fixed, the first one-way teeth are used for being matched with the second one-way teeth to prevent the second assembly from sliding relative to the first assembly.

In one embodiment, the first assembly has a nut formed on an upper end of the first abutment.

In an embodiment, the second assembly is provided with a cutting part at the upper end of the second abutting part; when the first assembly and the second assembly are embedded in the hole to be fixed, the cutting part is positioned outside the fixing hole.

In an embodiment, the surface of the first component and/or the second component facing the hole to be fixed is provided with a texture structure, and the texture structure is used for preventing the first component from axially sliding relative to the hole to be fixed.

In one embodiment, the expansion pins are made of absorbable and/or non-absorbable materials.

In one embodiment, when the expansion nail is made of absorbable material, the expansion nail is made of one of L-lactide, D-lactide, glycolide, epsilon-caprolactone, polyethylene glycol and 3-methylene carbonic ester.

The embodiment of the utility model provides a fixed knot constructs, characterized in that, including fixed plate, fixture and as any one the inflation nail; the fixture can be provided with a hole to be fixed, and the expansion nail is used for fixedly connecting the fixing plate to the fixture.

The embodiment of the utility model provides an in the expansion nail, can be through imbedding the first subassembly and the second subassembly of expansion nail in treating the fixed orifices, slide through the relative second subassembly of first subassembly, make the portion butt that slides of second subassembly on this second lateral wall of treating the fixed orifices, the expansion portion forms interference fit with the first lateral wall of treating the fixed orifices to make the expansion nail with treat fixed orifices interference fit, thereby fix in treating the fixed orifices.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:

in the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

FIG. 1 is a schematic diagram of the components of an expansion nail according to an embodiment of the present invention;

fig. 2 is a schematic axial cross-sectional view of a minimum expansion dimension of an expansion nail according to an embodiment of the present invention;

fig. 3 is an axial sectional view of an expanded state of the expansion nail according to the embodiment of the present invention;

fig. 4 is a matching schematic diagram of the minimum expansion size of the expansion nail according to the embodiment of the invention;

fig. 5 is a schematic view showing the expansion state of the expansion nail according to the embodiment of the present invention;

fig. 6 is a schematic view of the radial cross-sectional shape of an expansion nail according to an embodiment of the present invention;

fig. 7 is an enlarged schematic view of the area a in fig. 1 according to an embodiment of the present invention;

fig. 8 is a schematic view of a fixing structure according to an embodiment of the present invention.

Wherein the reference numbers are as follows:

1. a first component; 2. a second component; 11. a first abutting portion; 12. an expansion part; 13. a first latch; 14. a first unidirectional tooth; 15. a nail cap; 21. a second abutting portion; 22. a sliding part; 23. A second latch; 24. a second unidirectional tooth; 25. a cutting part; 3. and (7) fixing the plate.

Detailed Description

To make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts all belong to the protection scope of the present invention.

FIG. 1 is a schematic diagram of the components of an expansion nail according to an embodiment of the present invention; fig. 2 is a schematic axial cross-sectional view of a minimum expansion dimension of an expansion nail according to an embodiment of the present invention; fig. 3 is an axial sectional view of an expanded state of the expansion nail according to the embodiment of the present invention; please refer to fig. 1, fig. 2 and fig. 3

The embodiment of the utility model provides an expansion nail, which is characterized in that the expansion nail comprises a first component 1 and a second component 2; the first assembly 1 comprises an expansion portion 12 and a first abutment portion 11; the second assembly 2 comprises a sliding part 22 and a second contact part 21, wherein the second contact part 21 is used for the first contact part 11 to contact; when the first component 1 and the second component 2 are embedded in the hole to be fixed, the first abutting part 11 abuts against the second abutting part 21, the sliding part 22 abuts against the second side wall of the hole to be fixed, and the expansion part 12 forms interference fit with the first side wall of the hole to be fixed; wherein the second sidewall is opposite to the first sidewall.

The embodiment of the utility model provides an in the expansion nail, can be through imbedding the first subassembly 1 and the second subassembly 2 of expansion nail in treating the fixed orifices, slide through first subassembly 1 relative second subassembly 2, make the portion of sliding 22 butt of first subassembly 1 on this second lateral wall of treating the fixed orifices, expansion portion 12 forms interference fit with the first lateral wall of treating the fixed orifices to make the expansion nail with treat fixed orifices interference fit, thereby fix in treating the fixed orifices.

In the embodiment, the shape of the expansion nail can be circular, oval, rectangular and an oblong shape with two circles intersected; if the expansion nail is rectangular, chamfering can be carried out on the rectangular expansion nail so as to enhance the safety in use, wherein the expansion nail is preferably circular in radial section, and the mechanical property of the expansion nail is better when the radial section is circular; the first component 1 and the second component 2 can be divided into the first component 1 and the second component 2 by taking the middle point of the radial section of the expansion nail as the center, namely the section sizes of the first component 1 and the second component 2 are the same, and the section size of the first component 1 can be larger or smaller than that of the second component 2. The first assembly 1 comprises a first abutting part 11, the second assembly 2 comprises a second abutting part 21, and the second abutting part 21 is used for abutting against the first abutting part 11; the first contact portion 11 and the second contact portion 21 may be designed to be able to come into contact with each other completely, or may be designed to have a portion that does not come into contact with each other completely; when the fully abutting shape is designed, the fully abutting state is a case where the radial dimension of the expansion nail is minimum, where the fully abutting state means that the first abutting portion 11 and the second abutting portion 12 are fully abutted. When the first component 1 and the second component 2 are embedded in the holes to be fixed, specifically, when the first component 1 and the second component 2 are in the minimum size, placing the expansion nail in the fixing hole, wherein the expansion nail is in clearance fit with the fixing hole; the method comprises the steps of enabling a second assembly 2 to slide relative to a first assembly 1, enabling a sliding portion 22 of the second assembly 2 to be abutted against a second side wall of a hole to be fixed, enabling an expansion portion 12 on the first assembly 1 to be in interference fit with the first side wall of the hole to be fixed, specifically enabling the first assembly 1 and the second assembly 2 to be embedded into the hole to be fixed, enabling the radial size of the first assembly 1 and the radial size of the second assembly 2 to be increased by enabling the second assembly 2 to move relative to the first assembly 1, enabling the second assembly to be abutted against the second side wall, further enabling the second assembly 2 to press the first assembly 1 in the hole to be fixed, enabling the first assembly 1 to be in interference fit with the first side wall, and enabling an expansion nail to be tightly abutted against the hole to be fixed. The second side wall and the first side wall are inner walls of the hole to be fixed, when the first component 1 and the second component 2 are embedded into the hole to be fixed, the sliding part 22 abuts against the second side wall, and then the expansion part 12 opposite to the sliding part 22 abuts against the first side wall, so that the second side wall is opposite to the first side wall. Specifically, when the slide portion 22 moves, the position of the second side wall in contact with the slide portion 22 also changes, and correspondingly, the first side wall in contact with the expansion portion 12 may also change.

Wherein the minimum expansion dimension of the expansion nail may be 1.5-20mm and the length of the first component 1 of the expansion nail may be 4-200mm. The ratio of the maximum expansion size to the minimum expansion size of the expansion nail can be 101-150%. In addition, in the process of the bone surgery, the fractured bone can be connected by using two or more expansion nails. Furthermore, the current orthopedic anchors and interface pins can be replaced by fenestrations for the passage of medical threads through the first and/or second components 1, 2, wherein the threads are used to secure tendons and ligaments.

Fig. 4 is a matching schematic diagram of the minimum expansion size of the expansion nail according to the embodiment of the invention; fig. 5 is a schematic view showing the expansion state of the expansion nail according to the embodiment of the present invention; refer to fig. 4, 5;

in an embodiment, the first abutting portion 11 comprises a plurality of first latches 13, and the second abutting portion 21 comprises a plurality of second latches 23 engaged with the first latches 13; when the first component 1 and the second component 2 are embedded in the holes to be fixed, the first latch 13 and the second latch 23 are matched to enable the second component 2 to slide relative to the first component 1.

In this embodiment, the first abutting portion 11 includes a plurality of first latches 13, the plurality of first latches 13 may be the same in shape and/or size, the plurality of first latches 13 may also be different in shape and/or size, the second abutting portion 21 is provided with a second latch 23, and the second latch 23 is used for matching with the first latch 13. In one case, the shape of the second latch 23 can be fully engaged with the shape of the first latch 13, for example, the first latch 13 is a right-angled latch, and the second latch 23 is also a right-angled latch; the first latch 13 is a one-way tooth with a downward inclined surface, and the second latch 23 is a one-way tooth with an upward inclined surface; in another case, the first latch 13 and the second latch 23 may not be completely engaged, for example, the first latch may be a right-angled latch and the second latch may be an arc-shaped latch. In the embodiment of the present invention, preferably, by adopting the design that the second latch 23 and the first latch 13 can be completely engaged, when the first component 1 and the second component 2 are embedded in the hole to be fixed, the first component 1 can slide relative to the second component 2 according to the structure of the first latch 13 and the second latch 23. For example, the first latch 13 and the second latch 23 are selected from one or more of wedge-shaped latch, zigzag latch, and arc latch. It can be understood that the angle design of the latch end can be adjusted as required, so that the first component 1 can slide in one direction relative to the second component 2, and the first component 1 can slide in two directions relative to the second component 2.

Fig. 6 is a schematic view of a radial cross-sectional shape of an expansion nail according to an embodiment of the present invention; refer to fig. 6;

in this embodiment, the first latch 13 and the second latch 23 may be wedge-shaped latches, broken line latches, and arc-line latches, that is, according to the shape of the first latch 13 and the second latch 23, the line formed by the first latch 13 and the second latch 23 when intersecting in the axial cross section is a combination of one or more of wedge-shaped lines, broken lines, arc lines, and the like, wherein the shape of the first latch 13 and the second latch 23 is preferably a frustum-shaped structure, which can make the extraction strength of the expansion nail during use greater. Further, the first latch 13 and the second latch 23 are in the radial direction, and a line segment formed by the intersection of the first latch 13 and the second latch 23 may be a straight line, an arc line or a broken line, as shown in fig. 6, that is, the shape of the first latch 13 and the second latch 23 in the radial direction is a straight line, an arc line or a broken line; when the shape is an arc or a broken line, the performance of preventing the first member 1 from slipping relative to the second member 2 is better.

Fig. 7 is an enlarged schematic view of the area a in fig. 1 according to an embodiment of the present invention; refer to fig. 7;

in an embodiment, the first assembly 1 is provided with a first unidirectional tooth 14 on the first abutting portion 11, and the second assembly 2 is provided with a second unidirectional tooth 24 on the second abutting portion 21, wherein the second unidirectional tooth is matched with the first unidirectional tooth 14; when the first component 1 and the second component 2 are embedded in the hole to be fixed, the first one-way teeth 14 are used for cooperating with the second one-way teeth 24 to hinder the second component 2 from sliding relative to the first component 1.

In the present embodiment, the first unidirectional tooth 14 and the second unidirectional tooth 24 are matched to increase the sliding force between the first component and the second component 2, wherein the matching means may be that the first unidirectional tooth 14 and the second unidirectional tooth 24 are matched in number, the first unidirectional tooth 14 and the second unidirectional tooth 24 are matched in shape, and further, the matching may be performed in angle. When adopting the structure of first one-way tooth 14 and the one-way tooth 24 of second, second subassembly 2 will carry out relative displacement and can make one-way tooth take place deformation or treat that the fixed orifices takes place deformation with first subassembly 1, and second subassembly 2 just can slide first subassembly 1 relatively to the intensity of pulling out of inflation nail has been improved. When the first component 1 and the second component 2 are in interference fit with the holes to be fixed, the first component 1 and the second component 2 are difficult to slide in the holes to be fixed through the meshed one-way teeth, and the stability of the expansion nail is ensured; the shapes of the first unidirectional tooth 14 and the second unidirectional tooth 24 are preferably triangular, the first unidirectional tooth 14 and the second unidirectional tooth 24 are arranged in an array along the abutting surfaces of the first abutting part 11 and the second abutting part 21, specifically, the first unidirectional tooth 14 is arranged in the direction of the first abutting part 11 back to the nut, and the second unidirectional tooth 24 is arranged in the direction of the first abutting part 11 towards the nut, wherein it should be noted that the back and the direction here refer to the direction of the unidirectional tooth arrangement position on the first abutting part and the second abutting part, and are not the direction of the unidirectional tooth, wherein the direction of the unidirectional tooth is not limited. Further, the surface roughness of the first abutting portion 11 and the second abutting portion 21 may be increased by designing a texture, a concave-convex structure, or the like to increase the frictional force between the first abutting portion 11 and the second abutting portion 21, thereby achieving the same effect as the above-described method. The designed texture can be knurling, straight lines and the like.

In an embodiment, the first assembly 1 is formed with a nut 15 at the upper end of the first abutment 11.

In this embodiment, the upper end of the first component 1 is formed with a nail cap 15, specifically, the nail cap 15 may be a pressing cap or a locking cap, wherein the pressing cap is used for pressing the expansion nail in the hole to be fixed, the pressing cap is pressed on the surface where the hole to be fixed is located, and a countersunk head of the pressing cap can be embedded into the surface through a slot on the surface, so as to avoid stimulation of the pressing cap on body tissues in the use process of an actual operation. Further compress tightly the cap and can also use with fixed plate 3 cooperation, directly compress tightly on fixed plate 3, or the countersunk head is in the countersunk head groove of fixed plate 3 in order to compress tightly fixed plate 3. Wherein the locking cap is used for the inflation nail to use with the cooperation of fixed plate 3, be used for with the inflation nail locking on fixed plate 3, make the inflation nail can not take place to rotate or slide for the fixed plate, the locking cap can be realized through methods such as threaded connection or interference fit's joint, specifically can be that the nail cap 15 is concave-convex structure, be equipped with on the fixed plate 3 with the 15 complex draw-in grooves of nail cap, through with the 15 joint of nail cap in the draw-in groove, make the inflation nail be fixed in treat that the fixed orifices with last, the inflation nail is fixed in on fixed plate 3.

In an embodiment, the second assembly 2 is provided with a cut-out 25 at the upper end of the second abutment portion 21; when the first member 1 and the second member 2 are embedded in the hole to be fixed, the cut portion 25 is located outside the fixing hole.

In this embodiment, by forming the cutting portion 25 on the upper end of the second abutting portion 21, when the first component 1 and the second component 2 are embedded in the hole to be fixed, the portion of the second component 2 beyond the hole end surface is the cutting portion 25, and the cutting portion 25 is cut to keep the hole end surface flat. The cutting part 25 can also be used for clamping by hands or other tools, and when the expansion nail is placed in the hole to be fixed, a user can slide the second component 2 relative to the first component 1 by pulling the cutting part 25. In the actual production process, the cutting part 25 can be made into a structure without the second latch 23 or other shapes convenient for being held and pulled by hands or tools according to the use requirement.

In an embodiment, the surface of the first component 1 and/or the second component 2 facing the hole to be fixed is provided with a texture for preventing the first component 1 from sliding axially relative to the hole to be fixed.

In the present embodiment, the surface of the first component 1 and/or the second component 2 facing the hole to be fixed is provided with a texture structure, specifically, the texture may be knurling, straight lines, and the like. The outer surface of the first component 1 and/or the second component 2 can be arranged into a wave shape, a fold line shape and the like, so that the friction force between the outer surface of the first component 1 and/or the second component 2 and the hole to be fixed is improved, and the first component 1 is prevented from axially sliding relative to the hole to be fixed. In addition, the second component 2 may preferably adopt a smooth outer surface structure, and in particular, the outer surface of the sliding part 22 of the second component 2 adopts a smooth structure, which may reduce the friction between the sliding part 22 and the first side wall, thereby facilitating the sliding of the second component 2 relative to the first component 1.

In one embodiment, the expansion pins are made of an absorbable material and/or a non-absorbable material.

In this embodiment, the first component 1 and the second component 2 of the expansion nail may be made of the same material or different materials. Wherein the non-absorbable material comprises a metal material and a non-metal material. Wherein, the metal material can be pure titanium, titanium alloy, 316 stainless steel, etc., and the non-metal material can be plastic, such as polyethylene, polypropylene, polyetheretherketone, polytetrafluoroethylene, etc.; the non-metallic material may also be cadaver bone, ceramic, etc. The absorbable material consists of homopolymer or copolymer prepared with monomer including one or several of L-lactide, D-lactide, glycolide, epsilon-caprolactone, polyglycol and 3-methylene carbonate, and their mixture. Specifically, the copolymer may include, among others, racemic polylactic acid (PDLLA); polylactic acid (PLA); poly (glycolide-co-lactide) (PLGA); glycolide-lactide-polyethylene glycol copolymer (mPEG-PLGA). Among them, polylactic acid containing 50% of D-lactide can be preferably used; the glycolide can preferably adopt the glycolide with Glycolide (GA) content of 1-30%. Further, an inorganic material may be mixed into the absorbable material, and specifically, the ratio of the inorganic material is 1 to 60% and the ratio of the biodegradable material is 40 to 99%. Specifically, the inorganic material may be Hydroxyapatite (HA) or tricalcium phosphate (TCP), and further, the inorganic material may be a mixture of hydroxyapatite and tricalcium phosphate in any ratio. Furthermore, the particle size distribution of the inorganic material is 10 nm-50 μm, and the mass fraction of the inorganic material is 1% -60%.

Fig. 8 is a schematic view of a fixing structure according to an embodiment of the present invention, referring to fig. 8;

the embodiment of the utility model provides a fixing structure, which is characterized in that the fixing structure comprises a fixing plate 3, a to-be-fixed object and an expansion nail; the fixture is provided with a hole to be fixed, and the expansion nail is used for fixedly connecting the fixing plate 3 to the fixture.

In this embodiment, a fixing structure is provided, wherein the fixing plate 3 is configured to abut against a surface of a fixed object, the fixing plate 3 may be provided with a plurality of through holes or slots for connection of expansion nails, the expansion nails are inserted into the fixed object after passing through the through holes, when the number of the expansion nails connected to the fixing plate 3 is more than two, the fixing performance of the fixing structure is better, and a plurality of fixed objects can be fixed together, for example, two broken bones are fixedly connected by using a structure of the fixing plate 3 and the expansion nails. Wherein the fixed object can be bone or other objects to be fixed.

In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

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

The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, and all should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. Expansion nail, characterized in that it comprises a first component (1) and a second component (2);

the first component (1) comprises an expansion (12) and a first abutment (11);

the second component (2) comprises a sliding part (22) and a second abutting part (21), and the second abutting part (21) is used for abutting against the first abutting part (11);

when the first assembly (1) and the second assembly (2) are embedded in a hole to be fixed, the first abutting part (11) abuts against the second abutting part (21), the sliding part (22) abuts against the second side wall of the hole to be fixed, and the expansion part (12) and the first side wall of the hole to be fixed form interference fit;

wherein the second sidewall is opposite the first sidewall.

2. Expansion nail according to claim 1, characterized in that said first abutment (11) comprises a number of first latches (13) and said second abutment (21) comprises a number of second latches (23) cooperating with the first latches (13);

when the first assembly (1) and the second assembly (2) are embedded in the holes to be fixed, the first latch (13) is matched with the second latch (23) so that the second assembly (2) slides relative to the first assembly (1).

3. Expansion nail according to claim 2, characterized in that said first (13) and second (23) latches are selected from one or more of wedge-shaped latches, dog-leg latches, arc-shaped latches.

4. Expansion nail according to claim 1, characterized in that the first component (1) is formed with a head (15) at the upper end of the first abutment (11).

5. Expansion nail according to claim 1, characterized in that said second component (2) is formed with a cut (25) at the upper end of the second abutment (21);

when the first component (1) and the second component (2) are embedded in the hole to be fixed, the cutting part (25) is positioned outside the fixed hole.

6. Expansion nail according to claim 1, characterized in that the first assembly (1) is provided with a first unidirectional tooth (14) on the first abutment (11) and the second assembly (2) is provided with a second unidirectional tooth (24) on the second abutment (21) cooperating with the first unidirectional tooth (14);

when the first component (1) and the second component (2) are embedded in the holes to be fixed, the first one-way teeth (14) are used for being matched with the second one-way teeth (24) to prevent the second component (2) from sliding relative to the first component (1).

7. Expansion nail according to claim 1, characterized in that the surface of the first (1) and/or second (2) component facing the hole to be fixed is provided with a texture for hindering axial sliding of the first component (1) in relation to the hole to be fixed.

8. The expansion nail according to any one of claims 1 to 7, characterized in that the expansion nail is made of absorbable and/or non-absorbable material.

9. The expansion nail according to any one of claims 1-7, wherein the expansion nail is made of one of L-lactide, D-lactide, glycolide, epsilon-caprolactone, polyethylene glycol and 3-methylene carbonate.

10. A fixation structure, comprising a fixation plate (3), a fixture and an expansion nail according to any one of claims 1-7;

the fixture can be provided with a hole to be fixed, and the expansion nail is used for fixedly connecting the fixing plate (3) to the fixture.

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