CN212118270U - Pedicle screw dynamically fixed after rigid pressurization operation in operation and special tool - Google Patents

Abstract

The utility model belongs to a fixed pedicle of vertebral arch nail and specialized tool of rigidity pressurization postoperative developments in art, characterized by nail seat lateral wall are provided with the bayonet socket that the longitudinal section is wedge-shaped and link up the lateral wall, wedge the end through wedging specialized tool in the nail seat bayonet socket, can extrude nail body head downwards and restrict the swing between the nail body and nail seat. Therefore, the pedicle screw can be implanted into the pedicle under the condition that the screw body and the screw seat are coaxial, so that the pedicle screw fully exerts the functions of distraction and pressurization like the pedicle screw with the screw body and the screw seat in rigid connection, and the fixed segment can obtain the preset flexion and extension functions to the maximum extent after the special tool is removed after the operation is finished. The swing between the nail seat and the nail body can be prevented from being limited due to the incapability of expanding or pressurizing the fixed segment of the existing dynamic nail, and the nail seat and the nail body are still in a coaxial state, so that the original jiong shape that the fixed segment is allowed to bend and move within a reasonable range by the dynamic nail can not be realized.

Description

Pedicle screw dynamically fixed after rigid pressurization operation in operation and special tool

Technical Field

The utility model belongs to a human backbone internal fixation device and special mounting tool thereof.

Background

At present, in the bone surgery and the neurosurgery, a pedicle screw-rod fixing system is often used for reduction, correction, fixation and other treatments of injuries, degeneration, deformity, pathological changes and other injuries of the spine. In the operation process, after the implantation of all the pedicle screws and the installation of the connecting rod are completed, a distractor or a clamping device is often used for distracting or clamping the nail seat of the pedicle screws, and a nail body (hereinafter referred to as a fixing nail) rigidly connected with the nail seat is driven to pick up the vertebral body fixed by the pedicle screws, so that after the adjacent vertebral bodies and the intervertebral space are opened or closed to a required position, all the screw plugs are screwed down to maintain the position and maintain the spinal stability of the fixed segment.

The fixing mode of the pedicle screw rod fixing system is rigid fixation, the fixed spinal column segments have no movement function, and the fixed adjacent intervertebral discs are in a static state, so that the healing of fracture and the bony fusion of the intervertebral discs are facilitated. However, this static fixation method is not the most ideal fixation method, and is not suitable for all patients requiring fixation of the pedicle screw-rod system, so the non-rigid fixation theory and the corresponding non-rigid fixation pedicle screw-rod fixation system gradually emerge, and dynamic pedicle screws (hereinafter referred to as dynamic screws) in which the screw seat and the screw body are in a swingable non-rigid connection are also beginning to be applied clinically.

The original intention of such "dynamic nail" designs is: the screw body implanted into the vertebral body of a human body can still swing at a plurality of positive and negative angles (plus or minus angle) relative to the screw seat and the connecting rod after the connecting rod is locked by the screw plug so as to keep the proper bending and stretching movement of the fixed section of the dynamic screw; however, in the process of operation, when the adjacent vertebral bodies are expanded and clamped, the position between the nail seat and the vertebral bodies limits, so that the nail body can not be directly acted by using a tool, and the tool can only act on the nail seat like a traditional 'fixing nail'; this results in a fouling phenomenon: because the nail body and the nail seat of the dynamic pedicle nail can swing relative to each other, when the tool only acts on the nail seat, the front end of the nail body cannot synchronously move in parallel with the nail seat but temporarily stays in the original position under the influence of the resistance of soft tissues such as intervertebral discs, ligaments and the like, so that the coaxial relationship between the nail seat and the nail body is damaged, and an included angle is formed; only when the spreading or clamping force exerted by the tool continues to act to ensure that the swing included angle between the nail body and the axis of the nail seat reaches the designed limit value, the front edge of the vertebral body can be dragged to move at the lower end of the nail body, so that the spreading or clamping effect is generated; therefore, the swing angle set by the dynamic nail is completely lost, the buckling or straightening motion mode in the bending and stretching function is lost, the straightening or buckling amplitude in the opposite direction is doubled, and the fixed segment can only swing by 0-2 times of the design angle (0-2 x). The two results of the over-exercise range and the under-exercise range violate the original design purpose of the dynamic nail, and have adverse effects on human bodies, so that the advantage performance of the dynamic nail cannot be embodied, and the actual application of the advanced concept of dynamic fixation is seriously influenced.

The reasons influencing the surgical effect and popularization and application of the dynamic nail may be as follows: the researchers neglected that the traditional pedicle screw rod fixing system mostly adopts a structural form that the connecting rod is inserted into the U-shaped opening through groove at the top end of the screw seat and is locked and fixed by the screw plug, so that the lower component is shielded by the upper component and cannot be directly operated, namely, after the connecting rod is placed in, the adjustment and control of tools such as a screw feeder and the like on the screw body below the connecting rod are blocked, and the screw body and the screw seat which are flexibly connected cannot be temporarily rigidly connected when being opened or pressurized.

How to make the dynamic pedicle screw of the central type of connective bar can be the same as "staple", carry out the strutting and the clamp of adjacent centrum smoothly in the operation, and do not lose its swing angle (plus or minus angle) of setting for, make after the operation, the dynamic pedicle screw of implantation still can make the swing of a plurality of positive and negative settlement angles, thereby fully realize the medical effect of dynamic pedicle screw, this is the difficult problem that needs the solution clinically urgently.

Disclosure of Invention

Aiming at the dynamic pedicle screw which is familiar in the industry and is arranged in a connecting rod, and can be freely propped open and clamped like a fixed screw in the operation, and the operation operator who can normally swing with a plurality of positive and negative angles (+/-angle) and has the dynamic pedicle screw after the operation urgently needs to solve clinically, the utility model discloses the following solution.

Firstly, what needs to be solved is how to bypass or avoid the blocking of a connecting rod which is positioned right above the nail body and is arranged in a through groove of a U-shaped opening of the nail seat and a screw plug which is arranged in the nail seat, and the operation and the control of the nail body are implemented; the technical proposal of the utility model is that the pedicle screw is designed into the pedicle screw which is not rigidly connected with the screw body by the screw seat, and then is attached with a common screw plug and a connecting rod to form a dynamic pedicle screw fixing system.

An internal thread matched with the screw plug is arranged on an opening of the nail seat, and U-shaped open through grooves for bearing the connecting rod are symmetrically formed in the upper portion of the nail seat; the part below the U-shaped opening through groove of the nail seat is a ball socket-shaped inner cavity, the lower end of the inner cavity is provided with a through hole which is vertically downward, has a small inner diameter and a large outer diameter and is horn-shaped, the nail body penetrates through the horn-shaped through hole at the lower end of the nail seat, the upper end of the nail body is in a semi-spherical head shape matched with the ball socket-shaped inner cavity at the lower part of the nail seat, the diameter of the ball head of the nail seat is larger than the diameter of the inner opening of the through hole at the lower end of the nail seat, the neck of the nail body is clamped at the horn-shaped through hole at the lower end of the nail seat, after a connecting rod is installed and a screw plug is screwed down, the ball head of the nail body cannot be clamped in; during operation, the non-rigid connection of the nail seat and the nail body is temporarily fixed into rigid connection by a special tool.

The special tool is a special tool capable of limiting the rotation and swing between the dynamic pedicle screw seat and the screw body.

In order to realize the purpose of the invention, the lower part of the nail seat is at least provided with a bayonet which is formed by a through hole with a wedge-shaped longitudinal section, penetrates through the side wall of the nail seat and is large outside and small inside; the special tool is provided with a wedging end matched with the bayonet of the nail seat in shape, so that the wedging end can be wedged into the inner cavity of the nail seat to extrude the head of the nail body downwards and lock the ball head of the nail body together with the spherical cavity at the lower part of the nail seat, and the nail body cannot rotate and swing at the through hole at the lower end of the nail seat.

Preferably, one or a pair of through holes with wedge-shaped longitudinal sections and large outside and small inside are processed on the side wall of the lower part of the nail seat, and further, the pair of wedge-shaped through holes are symmetrically distributed on two sides of the nail seat vertical to the through groove with the U-shaped opening on the nail seat to form bayonets; the wedging end of a special tool is clamped into a wedge-shaped through hole, namely a clamping opening, of the side wall of the nail seat, and the head of the nail body preassembled in the bottom end of the nail seat is pressed down by utilizing the wedge-shaped surface of the wedge-shaped end, so that the nail body and the nail seat are locked into a whole which has no relative movement and is in a rigid connection state, and the whole dynamic pedicle nail is temporarily changed into a fixed nail; at the moment, the traditional expanding or pressurizing tool is used, so that the vertebral body and the intervertebral space can be expanded or compressed very conveniently.

That is, when the special tool is wedged into the bayonet of the side wall of the nail seat and the ball head part of the nail body is squeezed downwards, the nail seat and the nail body can form a relatively fixed rigid body like a fixing nail, so that the spine can be expanded or clamped by expanding or clamping the nail seat like the fixing nail. After the dynamic nail fixing device is completely fixed, the dynamic fixing function of the dynamic nail can be recovered only by taking out the special tool.

Furthermore, the horizontal height of the wedge-shaped bayonet or the wedge-shaped bayonets is adapted to the horizontal position of the nail body ball head after being assembled, so that an operator can put the wedge-shaped end of a special tool on the tool into the wedge-shaped bayonet by using the special tool to press and control the nail body ball head.

For the locking effect of reinforcing specialized tool to the nail body head, it is preferred, be equipped with a lower terminal surface in the nail seat for the clamping ring of ball socket form, simultaneously correspondingly, will the head of the nail body sets to the spheroid, the clamping ring is located between the bulb of connective bar and the nail body, and both make spherical cooperation vice. At the moment, the wedge end of the special tool is used for pressing the pressing ring downwards, so that the pressing ring and the spherical cavity at the lower part of the nail seat can lock the ball head together.

Furthermore, a compression spring or an elastic gasket can be arranged in the ball socket-shaped inner cavity at the lower part of the nail seat so as to increase the damping between the nail seat and the nail body and facilitate the operation. Compression spring or elastic gasket are located the clamping ring below, specialized tool wedge-in end is through pushing down the clamping ring to compression spring or elastic gasket also can make the clamping ring will jointly with nail seat lower part ball nest form inner chamber the bulb is locked.

Preferably, the press ring and the round hole in the section of the compression spring or the elastic gasket can penetrate through a screwdriver for twisting the nail body.

Preferably, the pressing ring and the compression spring or the elastic gasket are pre-installed in a ball-and-socket-shaped inner cavity at the lower part of the nail seat, and a backstop device is added on the upper edge of the pressing ring, so that temporary installation in an operation can be avoided.

Still further, the utility model discloses a component of developments pedicle of vertebral arch nail, like plug screw, connective bar, the nail body, clamping ring, spring or resilient pad, can follow the component of traditional developments nail basically, or only need make less change on former basis, so, can save the research and development expense, also can alleviate pressure for the stock in the production process.

The special tool consists of a wedge-in end and a base, wherein the appearance characteristic of the wedge-in end is matched with the wedge-shaped bayonet of the nail seat. The wedging end of the special tool may be tapered or "cylindrical body + tapered head" in addition to the wedge-shape first selected.

Preferably, the wedging end of the special tool is hinged and fixed on a base through a rotating shaft positioned on the side of the rear end of the wedging end, and the base is in a hook shape and can be hooked on the connecting rod; when the wedging end is wedged into the nail seat clamping opening to hook the hook on the connecting rod and clamp the hook, the wedging end can obtain the maximum wedging force at the same time, so that the nail seat and the nail body are in a rigidly connected static nail state; when the hook is taken down from the connecting rod, the wedging end can easily withdraw from the bayonet of the nail seat, so that the nail seat and the nail body are restored to a dynamic nail state which can swing oppositely.

But specialized tool does also set to the pincers form instrument of locking, is about to the nail seat bayonet socket is the symmetry form and sets up in the both sides wall of nail seat lower part, will wedge the end hinge and become the pincers form that the handle can lock up, wedge the nail seat bayonet socket from both sides respectively, extrude the bulb of the nail body downwards or extrude the bulb of the nail body downwards through the clamping ring jointly, behind the locking handle, alright produce and maintain the extrusion force that is enough to spacing into static nail with the dynamic nail.

Advantageous effects

The utility model discloses in order to bypass the connective bar, this kind of innovation thinking of the direct control nail body, successfully solved dynamic nail can't strut under the state put in and press from both sides tight medical difficult problem, can effectively avoid the present uncontrollable dynamic swing angle that appears clinically, or because of too big fixed inefficacy, or become static fixed defect because of the undersize to guarantee the operation quality, show and promote the curative effect, reduce the incidence and the emergence degree of operation complication.

Drawings

The invention is further explained below with reference to the drawings and the embodiments;

fig. 1 is a two-dimensional diagram and an effect diagram of the present invention;

FIG. 2 illustrates a technical problem of an unmodified dynamic nail during distraction;

fig. 3 is an exploded view of the dynamic pedicle screw of the present invention;

FIG. 4 is a partial enlarged view of the operation of the present invention;

FIG. 5 shows a second embodiment of the dynamic pedicle screw of the invention;

FIG. 6 is a two-dimensional diagram of the working principle of the special tool of the present invention;

FIG. 7 is a schematic diagram of the three-dimensional effect of the disclosed working principle;

FIG. 8 is a two-dimensional and effect diagram of a second embodiment of the special tool of the present invention;

figure 9 is several embodiments of wedge or taper bayonets and mating wedge or taper fixtures according to the present invention;

fig. 10 shows a third embodiment of the dynamic pedicle screw of the invention;

wherein: a plug screw 1; a screwdriver jack 11 in the center of the screw plug; the external thread 12 of the plug screw;

a connecting rod 2; a spring 4;

a compression ring 3; the upper end surface 31 of the compression ring; a compression ring inner cavity 32; a lower end face 33 of the compression ring; the press ring downward spherical surface 34;

a nail seat 5; nail base internal threads 51; a nail seat U-shaped open through slot 52; the nail seat inner spherical surface 53; a wedge-shaped bayonet 54; a downward through hole 55 of the nail seat;

a nail body 6; the upper end surface 61 of the nail body; a recess 62 on the end face of the shank; a nail body tail end 63; a hemispherical surface 64 on the shank;

a special tool 7; an wedge end 71; a ramp 711; a bottom surface 712; a hook 72; a hook inner side 721; an opening spring 73; a rotating shaft 74; a gripper arm 75;

in addition: a conventional tool G; force F for opening and clamping; a gap X; the intervertebral disc Z;

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clear, the present invention will be further described in detail with reference to the following embodiments; it should be understood that in the description of the present invention, the terms "left and right", "up and down", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for convenience of description of the present invention, and does not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Fig. 1 is a two-dimensional diagram and an effect diagram of the present invention; as can be seen from the illustrated drawings, the present invention basically has two parts: firstly, the pedicle screw which is called as a dynamic screw and is made according to the theory of 'non-rigid fixation' is popular at present, and belongs to a 'connecting rod middle-arranged type', and the pedicle screw is characterized in that: the connecting rod 2 and the screw plug 1 are both positioned right above the nail body 6; the nail body 6 and the implanted vertebral body can swing at a certain angle relative to the nail seat 5 and the connecting rod 2 which are connected into a whole; the other part is a special tool 7 used as a matching tool.

In the operation process, there is a step, namely, between the adjacent vertebral bodies implanted with the pedicle screw, carrying out adjustment such as distraction and clamping, as shown in the right two-dimensional diagram of fig. 2, the general operation is that a tool G is used for clamping the connecting rod and moving the screw seat, the ideal state is as the left side of the two groups of diagrams shown in fig. 2, when the screw body and the screw seat are rigidly connected in a coaxial state in the longitudinal section direction of the connecting rod, the screw body can pick up the vertebral bodies to realize distraction or clamping movement, and the design original purpose of the dynamic screw is realized, and the swinging of plus and minus a plurality of angles (plus and minus) is carried out, thereby achieving the medical effect expected to be generated by using the dynamic screw; however, because the existing dynamic nail is characterized in that the nail body can swing relative to the nail seat and cannot obtain a large enough external force for temporarily and rigidly connecting the nail body and the nail seat when being propped open or clamped, when the force F acts on the nail seat, the force F is influenced by soft tissues such as intervertebral disc Z and ligaments, and a large probability operation result is shown in an effect diagram and the right side of a two-dimensional diagram. Therefore, the swing angle set by the dynamic nail is completely or partially lost, which causes the reason that the dynamic nail can only move positively and can not move negatively, and even the dynamic nail cannot move positively and is not in line with the original purpose of using the dynamic nail.

To the difficult problem that the nail integument sheltered from, the utility model discloses made new attempt, walked around from the both sides of nail seat plug screw and connective bar penetrate from the bayonet socket of the new setting in below of nail seat, the nail integument of direct control nail seat intracavity, or through reciprocating of clamping ring, the nail integument of control clamping ring below.

As shown in fig. 3, before the operation, the compression ring 3, the spring 4 and the nail body 6 are assembled in the inner cavity of the nail seat 5, and a protruding obstacle that can prevent the compression ring 3 from being detached after the assembly is processed in the inner cavity of the nail seat 5; (not shown in the figures); when the operation is carried out, firstly, the screw body 6 is implanted into the vertebral body of a patient, then the connecting rod 2 is arranged on the U-shaped opening through groove 52 of the adjacent screw seat 5, then the screwing tool is arranged in the screwing tool jack 11 at the center of the screw plug 1, the connecting rod 2 is preliminarily fixed on the U-shaped opening through groove 52 by utilizing the external thread 12 and the internal thread 51 on the screw seat, and at the moment, all the components of the dynamic pedicle screw are in a relatively movable state.

The operation is gone on this moment, just need carry out position adjustment to adjacent pedicle screw, promptly "strut and press from both sides tight" or "rotatory orthopedic" stage, from figure 4 and the explosion diagram of fig. 3, just can see out the utility model discloses to traditional pedicle screw's improvement point: firstly, a pair of wedge-shaped bayonets 54 are processed in the direction of the nail seat 5 perpendicular to the U-shaped open through groove 52, the wedge-shaped bayonets 54 reach the inner cavity of the nail seat 5 from the outer surface of the nail seat 5, and the wedge-shaped bayonets 54 are horizontally arranged at positions corresponding to the pressing ring 3 assembled in the inner cavity of the nail seat 5, so that the bottom 712 of the wedging end 71 can be positioned on the upper end surface 31 of the pressing ring 3 after the wedging end 71 on the special tool 7 enters the wedge-shaped bayonets 54; then the nail body 6 can enter the wedging end 71, and is continuously driven by the special tool 7 horizontally, and simultaneously, under the interaction of the inclined surface 711 and the wedge-shaped or conical bayonet 54, the bottom surface 712 of the wedging end 71 presses the upper end surface 31 of the pressing ring, so that the pressing ring 3 integrally moves downwards until the lower end surface 33 of the pressing ring presses the upper end surface 61 of the nail body, and the nail body 6 is coaxial with the nail seat 5, namely, is vertical to the connecting rod 2.

By such operation, the dynamic pedicle screw is switched to be similar to a single-axis screw, and only by applying force on the screw seat 5, the screw body 6 can move along the axial direction of the connecting rod 2 and can also be rotationally adjusted around the axis without losing the original swing angle.

Because the semi-spherical surface 64 of the nail body is matched with the inner spherical surface 53 of the nail seat, the nail body 5 can swing, but the swing angle is limited by the diameter of the downward through hole 56 of the nail seat, and the diameter is set, so that the design requirement that the swing angle is limited to +/-2-3 degrees or +/-10-12 degrees can be met.

Fig. 5 is another embodiment of the dynamic pedicle screw of the invention, namely, the second embodiment, which is characterized in that the matching of the compression ring 3 and the screw body 6 is spherical, so that the spring 4 between the compression ring and the screw body can be eliminated; it should be specifically noted that: as can be seen from the two-dimensional drawing, the U-shaped open through groove 52 of the nail seat supports the connecting rod 2 and keeps a gap with the upper end surface 31 of the pressing ring, so that the lower spherical surface 34 of the pressing ring also keeps a gap with the hemispherical surface 64 of the upper end of the nail body, and therefore, the nail body 6 can swing in the inner cavity of the nail seat 5; once the compression ring 3 is pressed by the wedge-shaped or conical wedge-shaped end 71 to move downwards, the hemispherical surface 64 is restrained, so that the nail body 6 cannot swing; according to the experiment, the gap is only 0.5mm to achieve the purpose.

Fig. 10 is a more simplified embodiment of the present invention for "low notch" which is clinically emphasized, that is, the pressing ring 3 and the spring 4 are eliminated, the wedging end 71 of the special tool 7 is directly pressed on the hemispherical surface 64 at the upper end of the nail body, and after the special tool 7 is removed, since the hemispherical surface 64 and the cylindrical surface of the connecting rod 2 supported on the U-shaped open through groove 52 of the nail seat leave a proper amount of gap X, the hemispherical surface 64 at the upper end of the nail body and the spherical surface 53 in the nail seat are also in clearance fit, so that the nail body 6 can swing at a certain angle in the inner cavity of the nail seat 5; this oscillation, in addition to being constrained by the diameter of the downward bore 55 of the nail seat, is related to the clearance X, which, according to experiments, is only 0.3mm, whereas the notch of the third embodiment can be compressed to below 13.5mm, which is very popular clinically.

The basic working principle of the special tool of the utility model is fully explained in figure 6: fig. 6 a and b show the special tool 7 before and after the action, respectively, and fig. c is a top view of the diagrams a and b on both sides of the center line; with the effect diagram of fig. 7, it can be understood that: when the special tool 7 is not used, a gap X exists between the lower end surface 33 of the pressing ring and the upper end surface 61 of the nail body; when an operator wedges the wedging end 71 of the special tool 7 into the wedge-shaped bayonet 54 of the nail seat 5 and pulls the hook 72, the inner side 721 of the hook inevitably slides along the surface of the connecting rod 2 and rotates around the rotating shaft 74, so that the wedge-shaped or conical wedging end 71 is driven to realize the moving track, namely, the wedge-shaped or conical wedging end 71 moves horizontally firstly, enters the inner cavity of the nail seat 5 and is arranged above the pressing ring 3; simultaneously wedge inclined plane 711 on the end 71, produce to make the decurrent removal simultaneously of level to the inner chamber with nail seat wedge or toper bayonet 54, then, bottom surface 712 is supporting pressing clamping ring up end 31, and then compresses tightly the nail body 6, and this has just been accomplished at the operation in-process, the utility model discloses a switching of "developments" and "unipolar nail" has solved "losing initial angle" that need solve urgently clinically and has leaded to the unable normal technological problem who realizes its advantage in clinic of developments pedicle screw.

On both sides of the centre line of the two-dimensional diagrams of fig. 1 and 6b, the pressure ring 3 is shown at different levels in the two states "dynamic" and "single axis nail": when the dynamic state is achieved, the compression ring 3 is supported by the spring 4 to move upwards, and a gap X is formed between the lower end face 33 of the compression ring and the upper end face 61 of the nail body; when the press ring 3 is pressed down by the bottom surface 712 of the wedge-in end 71 of the special tool 7, the press ring 3 moves down, and is in a single-axis nail state at the moment; the downward movement distance is slightly larger than that of the embodiment shown in FIG. 5, and is about 0.5-1 mm.

After an operator determines the accurate position for opening or clamping, the screw plug 1 is locked by a screwdriver; because the screw plug 1 is positioned right above the nail seat 5, and the hook 72 of the special tool is positioned at one side of the nail seat 5, the position is vacated for the operation of the screwdriver; this also explains the structural feature of the clamp arm 72 in the second embodiment of the special tool 7 shown in fig. 8, in which the operator grips the upper end of the clamp arm 75, the movement-limiting clamp 71 opens in a jaw shape, and enters the wedge-shaped bayonet 54 from both sides of the nail seat 5, and the operator only needs to loosen his hand, open the spring 73 to drive the clamp arm 72 around the rotation shaft 74, and then use the inclined plane 711 of the wedge-shaped or conical clamp 71 to complete the downward movement of the press ring 3, and then use the turning tool to lock the screw plug in a non-blocking state, thereby completing the clinical work.

The key improvement feature of the present invention is to set wedge-shaped bayonet 54 on both sides of the nail seat and use wedging end 71 of the special tool 7, and the shape feature of such bayonet and wedging end is not limited to wedge shape, but also can be cone shape, and also can be cone-shaped wedging end + cylindrical connecting end, as shown in fig. 9, only two of them are shown, therefore, as long as the application of any modification, equivalent replacement and improvement made by the contents of the specification and drawings of the present invention, all should be included in the protection scope of the present invention.

Claims (6)

1. A dynamic fixed pedicle screw and specialized tool after intraoperative rigid compression surgery, the stated dynamic fixed pedicle screw is made up of pedicle screw and its affiliated screw plug and tie-rod that the nail seat and nail body present non-rigid connection, the stated tie-rod is snapped into the U-shaped open channel opened on the nail seat, and is fixed on nail seat by the stated screw plug; the nail body penetrates through the horn-shaped through hole at the lower end of the nail seat and can rotate and swing by taking the horn-shaped through hole at the lower end of the nail seat as a shaft after the connecting rod is installed and the screw plug is screwed down; the special tool is used for temporarily limiting the rotation and the swing between the dynamic pedicle screw seat and the screw body during the operation; the method is characterized in that: the lower part of the nail seat is provided with a bayonet which is formed by a wedge-shaped through hole penetrating through the side wall of the nail seat, wherein the longitudinal section of the through hole is large outside and small inside; the special tool is provided with a wedging end matched with the bayonet shape of the nail seat, and can be wedged into the inner cavity of the nail seat to extrude the head of the nail body downwards, so that the rotation and the swing between the nail body and the nail seat are limited.

2. The pedicle screw and the special tool for the dynamic fixation after the intraoperative rigid compression operation as claimed in claim 1, wherein the bayonet of the screw seat is arranged in the vertical direction of the U-shaped open through groove, the wedging end of the special tool is positioned above the ball head of the screw body, and the wedging end just locks the ball head together with the ball-and-socket-shaped inner cavity at the lower part of the screw seat after being wedged.

3. The pedicle screw and the special tool for the intraoperative rigid pressurization postoperative dynamic fixation as claimed in claim 1, wherein a compression ring with a spherical socket-shaped lower end surface is arranged in the screw seat, the compression ring is arranged between the connecting rod and the ball head of the screw body, and the wedge-in end of the special tool locks the ball head together with the spherical socket-shaped inner cavity at the lower part of the screw seat through the compression ring.

4. The pedicle screw and the special tool for the intraoperative rigid pressurization postoperative dynamic fixation as claimed in claim 3, wherein a compression spring or an elastic gasket is arranged in the spherical cavity at the lower part of the screw seat, the compression spring or the elastic gasket is positioned below the compression ring, and the wedge end of the special tool presses the compression ring downwards and compresses the compression spring or the elastic gasket, so that the compression ring and the spherical cavity at the lower part of the screw seat jointly lock the ball head.

5. The pedicle screw and the special tool for the dynamic fixation after the intraoperative rigid pressurization operation as claimed in claim 1, wherein the wedging end of the special tool is hinged and fixed on a base through a rotating shaft positioned at the side of the rear end of the special tool, and the base is in a hook shape and can be hooked on a connecting rod; when the wedging end is wedged into the nail seat clamping opening, the hook is hooked on the connecting rod and clamped tightly, the wedging end can obtain the maximum wedging force at the same time, so that the nail seat and the nail body are in a rigidly connected static nail state; when the hook is taken down from the connecting rod, the wedging end can easily withdraw from the bayonet of the nail seat, so that the nail seat and the nail body are restored to a dynamic nail state capable of swinging oppositely.

6. The pedicle screw and the special tool for the dynamic fixation after the intraoperative rigid pressurization surgery as claimed in claim 1, wherein the number of the bayonet of the screw seat is 2, the bayonet is symmetrically distributed on two side walls of the lower part of the screw seat, the wedging end is hinged into a clamp shape which can be locked by a handle, the bayonet of the screw seat is wedged from two sides respectively, the ball head of the screw body can be downwards extruded together or downwards extruded through a pressing ring, and after the handle is fastened, the extrusion force which is enough to limit the dynamic screw into the static screw can be generated and maintained.

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