CN220404096U - Bone anchoring element and body and spinal fixation device with bone anchoring element - Google Patents

Abstract

The utility model provides a bone anchoring element and a body and a spinal fixation device with a bone anchoring element. The bone anchoring element comprises: the mounting hole comprises a screw thread section and a containing section which are sequentially connected along the first direction, the containing section is adjacent to the clamp head mounting hole relative to the screw thread section, and the diameter of the clamp head mounting hole is larger than or equal to that of the screw thread section; the clamping head can be installed in the installation hole through the clamping head installation opening. Therefore, the bone anchoring element according to the embodiment of the utility model has the advantages of convenience in mounting the cartridge, high stability of the bone anchor and the cartridge, and high safety of the bone anchoring element.

Description

Bone anchoring element and body and spinal fixation device with bone anchoring element

Technical Field

The utility model relates to the field of internal fixation of the spine, in particular to a bone anchoring element, a main body and a spine fixing device with the bone anchoring element.

Background

In the related art, the collet is mounted in the mounting hole through an upper opening (an opening with threads) of the mounting hole. This makes assembly difficult and can damage the threads in the thread segments. In order for the jaws of the collet to pass through the upper opening (threaded opening) of the mounting hole, the radial dimensions of the jaws of the collet are made smaller. The clasping cavity at the jaw definition is therefore smaller, resulting in a smaller ball head diameter of the bone anchor. The contact surface between the ball head with smaller diameter and the clamping jaw is smaller, so that the friction force between the ball head and the clamping jaw is smaller, the ball head and the clamping head cannot be kept stable, the ball head and the clamping head are easy to separate from each other, and the human body is injured.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems in the related art to some extent. To this end, embodiments of the present utility model provide a bone anchoring element and body and a spinal fixation device having a bone anchoring element.

A bone anchoring element according to an embodiment of the present utility model includes:

the mounting hole comprises a screw thread section and a containing section which are sequentially connected along the first direction, the containing section is adjacent to the clamp mounting hole relative to the screw thread section, the diameter of the clamp mounting hole is larger than or equal to that of the screw thread section, and the maximum diameter of the containing section is larger than that of the clamp mounting hole;

the clamping head can be installed in the installation hole through the clamping head installation opening, the clamping head comprises a connecting part and a enclasping part which are connected with each other, the enclasping part comprises at least two clamping jaws which are arranged at intervals, and the clamping jaws define an enclasping cavity.

Therefore, the bone anchoring element according to the embodiment of the utility model has the advantages of convenience in mounting the cartridge, high stability of the bone anchor and the cartridge, and high safety of the bone anchoring element.

In some embodiments, the ratio of the diameter of the collet mounting port to the diameter of the threaded section is (1-1.5): 1.

In some embodiments, the receiving section includes a first receiving sub-section and a second receiving sub-section, the wall of the first receiving sub-section being a first spherical surface, the wall of the second receiving sub-section being a second spherical surface, the second spherical surface being adjacent to the collet mounting port relative to the first spherical surface, wherein a portion of each of the jaws is located in the second receiving sub-section and rests on the second spherical surface, and the remainder of each of the jaws is located in the first receiving sub-section and spaced apart from the first spherical surface.

In some embodiments, the minimum diameter of the first spherical section is greater than or equal to the maximum diameter of the second spherical section, and the length of the first spherical section in the first direction is greater than the length of the second spherical section in the first direction.

In some embodiments, the outer wall surface of the jaw includes an enlarged section, a straight section, and a contracted section connected in sequence, the straight section being adjacent to the connection portion with respect to the contracted section, the outer wall surface of the straight section being parallel to the first direction, the outer wall surface of the contracted section being contracted inward in a direction away from the enlarged section.

In some embodiments, the maximum outer diameter of the connection portion is less than the diameter of the collet mounting port and the minimum outer diameter of the hugging portion is less than or equal to the diameter of the collet mounting port.

In some embodiments, the mounting hole further comprises a connection section between the threaded section and the receiving section, the connection portion of the collet fitting within the connection section.

The application also provides a main part of bone anchoring element, the main part includes along the mounting hole and the perpendicular to of first direction extension the mounting groove of first direction, the mounting hole has screw plug mouth and the chuck installing port of screwing of relative setting, the mounting hole includes along the screw thread section that connects gradually in the first direction and holds the section, hold the section relative the screw thread section is adjacent the chuck installing port, the diameter of chuck installing port is greater than or equal to the diameter of screw thread section, the maximum diameter of holding the section is greater than the diameter of chuck installing port.

The present application also provides a spinal fixation device comprising:

a plurality of bone anchoring elements, each of the bone anchoring elements being any one of the bone anchoring elements 1-7;

a bone anchor comprising a head and a bone screw, the head and the bone screw being connected, the bone screw extending in the first direction, wherein the head extends into the mounting hole through the collet mounting port and fits within the hugging cavity;

a connecting rod passing through the bodies of a plurality of said bone anchoring elements, said connecting rod bearing against the collet of each of said bone anchoring elements; and

the plurality of screwing plugs are in threaded fit in the threaded sections of the main bodies of the plurality of bone anchoring elements in a one-to-one correspondence, and each screwing plug abuts against the connecting rod.

The present application also provides a spinal fixation device comprising:

a plurality of bone anchoring elements, each of the bone anchoring elements being any one of the bone anchoring elements 1-7;

a bone anchor comprising a head and a bone screw, the head and the bone screw being connected, the bone screw extending in the first direction, wherein the head protrudes into the mounting hole through the collet mounting port and fits within the hugging cavity, wherein the collet of the bone anchoring element is movably disposed within the receiving section of the body of the bone anchoring element between a gripping position gripping the bone anchor and a disengaged position disengaging the bone anchor;

a connecting rod passing through the bodies of a plurality of the bone anchoring elements; and

the screw plugs are screwed into the thread sections of the main bodies of the bone anchoring elements in a one-to-one and detachable mode, when the screw plugs are screwed into the thread sections in a one-to-one mode, each screw plug abuts against the corresponding chuck through the connecting rod, each chuck is located at the clamping position, and when the screw plugs are separated from the thread sections, each chuck is located at the separating position.

Drawings

Fig. 1 is a schematic diagram of a body according to an embodiment of the utility model.

Fig. 2 is a schematic diagram of a side cross-sectional view of a body according to an embodiment of the utility model.

Fig. 3 is a schematic diagram of a front cross-sectional view of a body according to an embodiment of the utility model.

Fig. 4 is a schematic view of a chuck according to an embodiment of the utility model.

Fig. 5 is a schematic view of a chuck according to an embodiment of the utility model.

Fig. 6 is a schematic view of a chuck according to an embodiment of the utility model.

Fig. 7 is a schematic view of a bone anchor according to an embodiment of the present utility model.

Fig. 8 is a schematic view of a spinal fixation device according to the present utility model.

Detailed Description

Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

The bone anchoring element 1000 according to an embodiment of the present utility model is described below with reference to the accompanying drawings. As shown in fig. 1 to 8, the bone anchoring element 1000 according to an embodiment of the present utility model includes a main body 100 and a collet 200.

The body 100 includes a mounting hole 110 extending in a first direction. For example, the first direction may be an up-down direction, which is indicated by an arrow a in fig. 1. The mounting hole 110 extends in the up-down direction will be described in detail below.

The mounting hole 110 has a screw hole 111 and a collet mounting hole 112 which are disposed opposite to each other in the first direction, that is, the mounting hole 110 penetrates the body 100 in the first direction. Specifically, the screw-on plug opening 111 is an upper opening of the mounting hole 110, and the collet mounting opening 112 is a lower opening of the mounting hole 110. The mounting hole 110 includes a threaded section 130 and a receiving section 140 connected in sequence along a first direction, the receiving section 140 being adjacent the collet mounting port 112 opposite the threaded section 130. Specifically, the threaded section 130 is located above the receiving section 140. The diameter d2 of the collet mounting port 112 is greater than or equal to the diameter d1 of the threaded section 130 and the maximum diameter d3 of the receiving section 140 is greater than the diameter d2 of the collet mounting port 112.

The collet 200 can be mounted in the mounting hole 110 through the collet mounting port 112, and the collet 200 includes a connecting portion 210 and a clasping portion 220 that are connected to each other. Specifically, the connection portion 210 is located above the clasping portion 220. Hug 220 includes at least two spaced apart jaws 221, with one end of each jaw 221 connected to coupling 210. Each jaw 221 extends from coupling portion 210 in a direction adjacent collet mount mouth 112. Specifically, each jaw 221 extends downwardly from connection 210. The plurality of clamping jaws 221 define a hugging cavity 222 for receiving a bone anchor.

In the related art, the chuck is mounted in the mounting hole through an upper opening of the mounting hole (generally corresponding to the screw-on tap 111 of the present application). This makes assembly difficult and can damage the threads in the thread segments. In order to avoid damaging threads in the thread section, on one hand, in order to enable clamping jaws of the clamping head to pass through an upper opening of the mounting hole, the minimum outer diameter of the clamping jaws of the clamping head is smaller than the diameter of the thread section, so that a holding cavity defined by the clamping jaws is smaller (a containing cavity in the mounting hole is smaller), the diameter of a ball head of the bone anchor is smaller, the contact surface between the ball head with the smaller diameter and the clamping jaws is smaller, the friction force between the ball head and the clamping jaws is smaller, the ball head and the clamping head cannot be kept stable, and the clamping heads are easy to separate from each other, so that injury is caused to a human body; on the other hand, the outer diameter of the thread section is increased, and in this case, the outer diameter of the main body is larger, and the wound area caused in the process of implantation into a human body is larger.

The bone anchoring element 1000 according to the embodiment of the present utility model is configured such that the collet 200 is installed in the mounting hole 110 through the collet mounting port 112 by making the diameter d2 of the collet mounting port 112 equal to or greater than the diameter d1 of the threaded section 130. The collet 200 is mounted in the mounting hole 110 through the collet mounting port 112 to facilitate the mounting of the collet 200 without damaging the threads in the threaded section 130. Thus, the body 100 has the advantage of facilitating installation of the collet 200 and not damaging the threads within the threaded section 130.

The diameter d2 of the collet mount 112 is greater than or equal to the diameter d1 of the threaded section 130, and therefore, the radial diameter of the jaws 221 that enter the mounting hole 110 through the collet mount 112 is greater than the diameter of the jaws that enter the mounting hole through the threaded section, thereby resulting in a larger diameter bone anchor that mates with the hug cavity 222. That is, the contact surface between the bone anchor and the clamping jaw 221 is large, and the friction force between the bone anchor and the clamping jaw 221 is large, so that the bone anchor is stable in the holding cavity 222 of the chuck 200, and the safety of the bone anchoring element 1000 is improved.

In the case that the friction force between the bone anchor and the clamping jaw 221 is equal to that between the bone anchor and the clamping jaw in the related art, the diameter d2 of the chuck mounting hole 112 is greater than or equal to the diameter d1 of the threaded section 130, so that the outer diameter of the main body 100 is reduced, thereby reducing the volume of the main body 100 and reducing the damage of the main body 100 to the human body. Alternatively, in the case where the friction force between the bone anchor and the jaw 221 is greater than that of the bone anchor and the jaw in the related art, the outer diameter of the body 100 is smaller, thereby reducing the volume of the body 100 and reducing the damage of the body 100 to the human body.

Accordingly, the bone anchoring element 1000 according to an embodiment of the present utility model has advantages of convenience in mounting the cartridge 200, high stability of the bone anchor and the cartridge 200, and high safety of the bone anchoring element 1000.

In some embodiments, the body 100 is provided with a mounting slot 120 perpendicular to the first direction. Specifically, the mounting groove 120 extends in the horizontal direction. In some embodiments, the ratio of the diameter d2 of the collet mounting port 112 to the diameter d1 of the threaded section 130 is (1-1.5): 1. Facilitating the mounting of the collet 200 from the collet mounting port 112 into the mounting hole 110 and providing a lower end of the body 100 (the end adjacent to the collet mounting port 112) with a strong structural strength.

Optionally, the ratio of the diameter d2 of the collet mounting port 112 to the diameter d1 of the threaded section 130 is 1.3:1.

As shown in fig. 2 and 3, in some embodiments, the containment segment 140 includes a first containment sub-segment 141 and a second containment sub-segment 142. Specifically, the first accommodating sub-section 141 is located above the second accommodating sub-section 142, the wall surface of the first accommodating sub-section 141 is a first spherical surface, the wall surface of the second accommodating sub-section 142 is a second spherical surface, and the second spherical surface is adjacent to the chuck mounting opening 112 relative to the first spherical surface. The first spherical section and the second spherical section are curved surfaces or the rest parts of the two parallel surfaces after the rear part of the spherical surfaces is cut off. Wherein a portion of each jaw 221 is located in the second receiving subsection 142 and rests against the second spherical surface. The second spherical section of the second receiving sub-segment 142 circumscribes a portion of each jaw 221 such that the collet 200 is secured within the receiving segment 140 after the bone anchor is gripped. The remainder of each jaw 221 is located in first receiving subsection 141 and is spaced apart from the first spherical surface so that when jaws 221 move upward, the remainder of each jaw 221 is prevented from contacting the first spherical surface to block upward movement of jaws 221. Facilitating a portion of each jaw 221 to enter first receiving sub-section 141 and expand to facilitate entry or exit of the bone anchor into or from cartridge 200.

In some embodiments, the minimum diameter of the first spherical section is greater than or equal to the maximum diameter of the second spherical section. That is, the minimum diameter of the first spherical section is greater than the degree of curvature of the second spherical section, such that at least a portion of the first receiving sub-section 141 becomes larger in diameter in a direction away from the collet mounting port 112. Specifically, at least a portion of the first receiving sub-section 141 becomes larger in diameter when extending upward. And the length of the first spherical section in the first direction is greater than the length of the second spherical section in the first direction. Such that first receiving sub-section 141 provides sufficient space for expansion of clamping jaw 221 to facilitate entry or exit of a bone anchor into or from collet 200 at first receiving sub-section 141.

As shown in fig. 6, in some embodiments, the outer wall of jaw 221 includes an enlarged section 223, a straight section 224, and a contracted section 225 connected in sequence, with straight section 224 being adjacent to connection 210 relative to contracted section 225. Specifically, the outer wall surface of the clamping jaw 221 includes an expansion section 223, a straight section 224, and a contraction section 225, which are connected in order from top to bottom.

The straight section 224 is parallel to the first direction. So that the remainder of each jaw 221 (straight section 224) is located in first receiving sub-section 141 and spaced apart from the first spherical surface. Such that as the clamping jaws 221 move upward, the remaining portion of each clamping jaw 221 (straight section 224) does not contact the first ball cut surface, facilitating a portion of each clamping jaw 221 (contracted section 225) to enter into the first receiving sub-section 141 and expand, thereby facilitating entry or exit of the bone anchor into or out of the collet 200.

The outer wall surface of the contracted section 225 is contracted inwardly in a direction away from the expanded section 223 so that the clamping jaw 221 grips the bone anchor. And a portion (convergent section 225) of each jaw 221 is located on the second containment sub-section 142 and rests against the second spherical surface. The outer wall surface of the contraction section 225 is adapted to the shape of the second spherical section, so that the contraction section 225 has a larger contact area with the second spherical section, i.e. the contraction section 225 has a larger friction force with the second spherical section.

In some embodiments, the bone anchoring element 1000 according to an embodiment of the present utility model further includes a bone anchor 300, the bone anchor 300 including a head 310 and a bone screw 320, the head 310 and the bone screw 320 being connected, the bone screw 320 extending in a first direction.

As shown in fig. 5, in some embodiments, the outer wall surface of the clamping jaw 221 is a cambered surface with a diameter that increases and decreases, so as to facilitate the matching of the clamping jaw 221 with the second spherical section.

As shown in fig. 4-6, in some embodiments, a resilient groove 226 is formed between two clamping jaws 221, the bottom of the resilient groove 226 being circular. When the clamping jaw 221 is radially compressed, the circular groove bottom enables the elastic groove 226 to have certain structural strength, so that the elastic groove is not easy to break.

In some embodiments, the maximum outer diameter of the connection portion 210 is less than the diameter d2 of the collet mounting port 112 and the minimum outer diameter of the hugging portion 220 is less than or equal to the diameter d2 of the collet mounting port 112. The minimum outer diameter of hug 220 refers to the minimum outer diameter of clamping jaw 221 when elastically deformed and contracted. The outer diameter of the clasping portion 220 of the collet 200 in its natural state is greater than the diameter of the collet mounting port 112. The diameter of the clasping portion 220 is also larger than the diameter of the collet mounting port 112 when the collet 200 is compressed and contracted to a critical state where elastic deformation is to occur, and when the clasping portion 220 enters the collet mounting port 112, the arc-shaped structure of the clasping portion 220 is deformed so as to enter from the collet mounting port 112.

As shown in fig. 2, in some embodiments, the mounting hole 110 further includes a connection section 150 between the threaded section 130 and the receiving section 140. The coupling portion 210 of the collet 200 is fitted into the coupling segment 150, and the outer wall surface of the coupling portion 210 of the collet 200 is fitted with the wall surface of the coupling segment 150, thereby facilitating positioning and mounting of the collet 200. For example, the outer wall surface of the connection portion 210 of the collet 200 is provided with a slot extending in the first direction, and the slot is engaged with the inner wall surface of the connection segment 150.

As shown in FIG. 8, the present utility model also includes a spinal fixation device 2000. The spinal fixation device 2000 according to an embodiment of the present utility model includes a plurality of bone anchor elements 1000, a bone anchor 300, a connecting rod 400, and a plurality of tightening plugs 500.

Each of the bone anchoring elements 1000 is a bone anchoring element 1000 as described above.

Bone anchor 300 includes a head 310 and a bone screw 320, head 310 and bone screw 320 being connected, bone screw 320 extending in a first direction. Wherein the head 310 extends into the mounting hole 110 through the collet mounting port 112 and fits within the hug cavity 222.

The connecting rod 400 passes through the bodies 100 of the plurality of bone anchoring elements 1000, the connecting rod 400 bearing against the collet 200 of each bone anchoring element 1000. So that collet 200 presses against bone anchor 300 so that jaws 221 grip head 310. A plurality of tightening plugs 500 are threadedly engaged one-to-one within the threaded segments 130 of the body 100 of the plurality of bone anchoring elements 1000, each tightening plug 500 bearing against the connecting rod 400. Tightening the plug 500 limits the connecting rod 400. As each of the screw plugs 500 is tightened against the connecting rod 400, the connecting rod 400 is pressed against the collet 200 so that the collet 200 presses against the bone anchor 300 so that the jaws 221 grip the head 310.

Accordingly, the spinal fixation device 2000 in accordance with the embodiments of the present utility model has advantages of easy installation of the cartridge 200, high stability of the bone anchors 300 and the cartridge 200, and high safety of the spinal fixation device 2000.

As shown in FIG. 8, the present utility model also includes a spinal fixation device 2000. The spinal fixation device 2000 according to an embodiment of the present utility model includes a plurality of bone anchor elements 1000, a bone anchor 300, a connecting rod 400, and a plurality of tightening plugs 500.

Each of the bone anchoring elements 1000 is a bone anchoring element 1000 as described above.

Bone anchor 300 includes a head 310 and a bone screw 320, head 310 and bone screw 320 being connected, bone screw 320 extending in a first direction. Wherein the head 310 extends into the mounting hole 110 through the collet mounting port 112 and fits within the hug cavity 222. Wherein the collet 200 of the bone anchoring element 1000 is movably arranged within the receiving section 140 of the body 100 of the bone anchor 300 between a clamping position clamping the bone anchor 300 and a disengaged position disengaging the bone anchor 300. The collet 200 holds the head 310 of the bone anchor 300 in a clamping position to maintain the collet 200 in secure connection with the bone anchor 300. The collet 200 is in a disengaged position so that the head 310 of the bone anchor 300 enters or exits the collet 200.

The connecting rod 400 passes through the bodies 100 of the plurality of bone anchoring elements 1000, and each bone anchoring element 1000 is coupled to the human spine so as to correct the spine. The plurality of screw plugs 500 may be threadably engaged in a one-to-one and removable manner within the threaded segments 130 of the body 100 of the plurality of bone anchoring elements 1000. Wherein, when the plurality of screwing plugs 500 are screwed into the plurality of thread segments 130 in a one-to-one correspondence, each screwing plug 500 is abutted against the corresponding collet 200 by the connecting rod 400, and each collet 200 is in the clamping position. So that collet 200 presses against bone anchor 300 so that jaws 221 grip head 310. When the plurality of screw plugs 500 are disengaged from the plurality of thread segments 130, each of the cartridges 200 is in the disengaged position. So that the head 310 of the bone anchor 300 is pulled out of the cartridge 200.

In installation, the connecting rod 400 is inserted into the plurality of mounting slots 120 and a plurality of tightening plugs 500 are threadedly engaged one-to-one in the plurality of thread segments 130 such that each tightening plug 500 abuts the connecting rod 400. So that collet 200 is pressed against bone anchor 300 so that jaws 221 grip head 310, completing the installation of spinal fixation device 2000.

Upon removal, the plurality of screw plugs 500 are removed from the plurality of thread segments 130 in a one-to-one correspondence such that the screw plugs 500 no longer bear against the connecting rod 400. So that no force is applied to the bone anchor 300 by the collet 200, causing the clamping jaw 221 to move upward and expand, thereby allowing the bone anchor 300 to be removed from the collet 200 and complete the removal of the spinal fixation device 2000.

Accordingly, the spinal fixation device 2000 in accordance with the embodiments of the present utility model has advantages of easy installation of the cartridge 200, high stability of the bone anchors 300 and the cartridge 200, and high safety of the spinal fixation device 2000.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

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

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean 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 utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims (10)

1. A bone anchoring element, comprising:

the mounting hole comprises a screw thread section and a containing section which are sequentially connected along the first direction, the containing section is adjacent to the clamp mounting hole relative to the screw thread section, the diameter of the clamp mounting hole is larger than or equal to that of the screw thread section, and the maximum diameter of the containing section is larger than that of the clamp mounting hole;

the clamping head can be installed in the installation hole through the clamping head installation opening, the clamping head comprises a connecting part and a enclasping part which are connected with each other, the enclasping part comprises at least two clamping jaws which are arranged at intervals, and the clamping jaws define an enclasping cavity.

2. The bone anchoring element according to claim 1, wherein the ratio of the diameter of the collet mounting port and the diameter of the threaded section is (1-1.5): 1.

3. The bone anchoring element of claim 1, wherein the receiving section includes a first receiving sub-section and a second receiving sub-section, the wall of the first receiving sub-section being a first spherical surface and the wall of the second receiving sub-section being a second spherical surface, the second spherical surface being adjacent the collet mounting port relative to the first spherical surface, wherein a portion of each of the jaws is located on and abuts the second receiving sub-section and the remainder of each of the jaws is located on and spaced apart from the first receiving sub-section.

4. The bone anchoring element according to claim 3, wherein the minimum diameter of the first spherical section is greater than or equal to the maximum diameter of the second spherical section, the length of the first spherical section in the first direction being greater than the length of the second spherical section in the first direction.

5. The bone anchoring element according to claim 1 or 2, wherein the outer wall surface of the clamping jaw comprises an enlarged section, a flat section and a contracted section connected in sequence, the flat section being adjacent to the connection with respect to the contracted section, the outer wall surface of the flat section being parallel to the first direction, the outer wall surface of the contracted section being contracted inwards in a direction away from the enlarged section.

6. The bone anchoring element according to claim 1 or 2, wherein the maximum outer diameter of the connecting portion is smaller than the diameter of the collet mounting port and the minimum outer diameter of the hugging portion is smaller than or equal to the diameter of the collet mounting port.

7. The bone anchoring element according to claim 1 or 2, wherein the mounting hole further comprises a connecting section between the threaded section and the receiving section, the connecting portion of the collet fitting within the connecting section.

8. A body of a bone anchoring element, the body comprising a mounting hole extending in a first direction and a mounting slot perpendicular to the first direction, the mounting hole having oppositely disposed screw threads and a collet mounting opening, the mounting hole comprising threaded segments and receiving segments connected sequentially along the first direction, the receiving segments being relatively adjacent the collet mounting opening, the collet mounting opening having a diameter equal to or greater than the diameter of the threaded segments, the receiving segments having a maximum diameter greater than the diameter of the collet mounting opening.

9. A spinal fixation device comprising:

a plurality of bone anchoring elements, each of the bone anchoring elements being any one of the bone anchoring elements 1-7;

a bone anchor comprising a head and a bone screw, the head and the bone screw being connected, the bone screw extending in the first direction, wherein the head extends into the mounting hole through the collet mounting port and fits within the hugging cavity;

a connecting rod passing through the bodies of a plurality of said bone anchoring elements, said connecting rod bearing against the collet of each of said bone anchoring elements; and

the plurality of screwing plugs are in threaded fit in the threaded sections of the main bodies of the plurality of bone anchoring elements in a one-to-one correspondence, and each screwing plug abuts against the connecting rod.

10. A spinal fixation device comprising:

a plurality of bone anchoring elements, each of the bone anchoring elements being any one of the bone anchoring elements 1-7;

a bone anchor comprising a head and a bone screw, the head and the bone screw being connected, the bone screw extending in the first direction, wherein the head protrudes into the mounting hole through the collet mounting port and fits within the hugging cavity, wherein the collet of the bone anchoring element is movably disposed within the receiving section of the body of the bone anchoring element between a gripping position gripping the bone anchor and a disengaged position disengaging the bone anchor;

a connecting rod passing through the bodies of a plurality of the bone anchoring elements; and

the screw plugs are screwed into the thread sections of the main bodies of the bone anchoring elements in a one-to-one and detachable mode, when the screw plugs are screwed into the thread sections in a one-to-one mode, each screw plug abuts against the corresponding chuck through the connecting rod, each chuck is located at the clamping position, and when the screw plugs are separated from the thread sections, each chuck is located at the separating position.