CN116035681A

CN116035681A - Spinal stabilization device

Info

Publication number: CN116035681A
Application number: CN202310343787.0A
Authority: CN
Inventors: 王鹏; 张剑宁; 赵彦涛
Original assignee: First Medical Center of PLA General Hospital
Current assignee: First Medical Center of PLA General Hospital
Priority date: 2023-04-03
Filing date: 2023-04-03
Publication date: 2023-05-02
Anticipated expiration: 2043-04-03
Also published as: CN116035681B

Abstract

The invention discloses a spine stabilization device, which comprises a main rod, an auxiliary rod and a fixer; the anchor includes: a main holding member having a main accommodating groove for receiving the main lever; a sub-holding member having a sub-receiving groove that receives the sub-lever; the outer peripheral surface of the force application sleeve is provided with an inclined plane, and the main holding part is provided with a guide hole opposite to the inclined plane; the positioning mechanism comprises a hollow seat, an expansion part, a first sphere and a second sphere; the plurality of expansion cells of the expansion member are surrounded externally by a spherical structure and internally by a tapered bore; the expansion part extends into the spherical cavity of the hollow seat; the first sphere and the second sphere are respectively positioned in the guide hole and the conical hole; the first pressing part is screwed to enable the force application sleeve to push against the first sphere and the second sphere through inclined plane matching; a second pressing member provided in the main holding member; a third pressing member provided in the sub-holding member; a first bone screw attached to the bottom of the primary retention member.

Description

Spinal stabilization device

Technical Field

The present invention relates to an apparatus for treating the spinal column, and more particularly to a stabilization device for correcting the spinal column.

Background

As is known, a severely deformed spine (e.g., a laterally bent spine) is usually corrected by surgical means, and surgical implantation instruments such as stabilization (correction) devices are used to correct the spine, which generally include a rod-like member for reconstructing a spinal curve and a plurality of anchors connected in series to the rod-like member, the anchors including a holding member and bone nails formed on the holding member for screwing into the spine such that the anchors are connected to the spine, each of the holding members of the anchors having a radially-through receiving slot extending upwardly through a top portion of the holding member, the rod-like member being received by the receiving slot from the top portion of the holding member down into the receiving slot, the rod-like member being held down by a holding member to compress the rod-like member by a compressing member, such that the rod-like member forms a fixed connection with the rod-like member, and the rod-like member is connected to the spine by the plurality of anchors connected in series, thereby establishing an overall structure for correcting the spine.

In some cases, two rod-like members may be arranged side by side for therapeutic effect, e.g., with two rod-like members for increased support strength, and for example, with two rod-like members for reconstruction of a more complex spinal curve. In the prior art, two receiving grooves are provided on each holder for receiving two rod-like members, and in particular, two receiving grooves are provided on a holding member of the holder for receiving two rod-like members, respectively. However, in many cases, the curved state and the spatial posture of the two rod-shaped members are not completely identical, and thus, after one rod-shaped member is received in one of the receiving grooves, the other rod-shaped member may not be received in the other receiving groove in a relatively consistent manner due to warpage with respect to the receiving groove, or even the other rod-shaped member may not enter the receiving groove, and it is necessary to introduce the rod-shaped member into the corresponding receiving groove by means of a force applied by a tool, which not only increases the complexity of the operation, but also has worse effects: after the other rod-shaped component is finally received by the accommodating groove and is pressed by the pressing component, the rod-shaped component can deform, bending moment can be generated inside the rod-shaped component due to elastic deformation in deformation, and the integral supporting form of the rod-shaped component is changed, so that the spine curve expected to be constructed is damaged due to the change of the mechanical property of the rod-shaped component.

In order to improve the above-mentioned problems caused by arranging two rod-like members, there is provided a holder in the prior art, as shown in fig. 1, which comprises two holding members, which may be referred to as a main holding member 1001 and a sub holding member 1002, wherein the sub holding member 1002 is provided on one side of the main holding member 1001, and the main holding member 1001 and the sub holding member 1002 are provided with a main receiving groove 10011 and a sub receiving groove 10021, respectively; the two rod-like members may be referred to as a main rod 2001 and a sub rod 2002, and the main accommodating groove 10011 is for accommodating the main rod 2001 and the sub accommodating groove 10021 is for accommodating the sub rod 2002. The sub holding member 1002 and the main holding member 1001 are also configured to be pivotally connected, specifically, a rotary shaft 1003 is provided to penetrate an adjacent wall of the sub holding member 1002 and the main holding member 1001 so that both holding members are pivotally connected, an end portion of the rotary shaft 1003 on one side of the main holding member 1001 is configured to be always in a fixedly connected state with the main holding member 1001, an end portion of the rotary shaft 1003 on one side of the sub holding member 1002 is configured to be rotatably adjustable and can be fixed after adjustment, for example, two face gears which are engaged with each other are provided to an end portion of the rotary shaft 1003, and separation and engagement of the two face gears are controlled by a fastener. When the sub lever 2002 is not well received in the sub receiving groove 10021 of the sub holding member 1002 due to the warpage of the sub lever 2002 with respect to the main lever 2001, the sub receiving groove 10021 can be adapted to fit with the sub lever 2002 by rotating the sub holding member 1002, and then the sub holding member 1002 is locked with the rotation shaft 1003 by an operating tool, thereby holding the sub holding member 1002 in an adjusted state.

However, the operation of locking the sub-holding member 1002 with the rotation shaft 1003 is very difficult because: the operation region where the operation incision 3000 is locked is located at the groove wall of the sub-receiving groove 10021 of the sub-holding member 100, which is oriented perpendicular to the direction of the top of the holding member, the operation tool (such as a screwing tool) needs to be entered in the operation direction as shown in fig. 1, and the head of the operation tool needs to be directed toward the groove wall 100211 of the sub-receiving groove, which not only causes an undesired expansion of the incision 3000, but also causes the head of the operation tool to be hard to be extended into the operation region, and the operation field is also poor.

Further, since the sub-holding member 1002 and the main holding member 1001 are arranged to be pivotally connected, the sub-holding member 1002 can rotate only about one axis with respect to the main holding member 1001, for example, in fig. 1, the sub-holding member 1002 can rotate only up and down about the rotation shaft 1003 to accommodate the warpage of the sub-lever 2002 in the up-down direction with respect to the main lever 2001, however, if the sub-lever 2002 warps in other directions with respect to the main lever 2001, for example, in the left-right direction, at this time, the sub-holding member 2002 cannot be adjusted to a state where the sub-receiving groove 10021 coincides with the sub-lever 2002.

Disclosure of Invention

In view of the foregoing technical problems in the prior art, embodiments of the present invention provide a spinal stabilization device.

In order to solve the technical problems, the technical scheme adopted by the embodiment of the invention is as follows:

a spinal stabilization device comprising a rod-like member and a plurality of anchors connected in series to the rod-like member, the rod-like member comprising a primary rod and a secondary rod disposed side-by-side, the anchors comprising:

a main holding member having a main accommodating groove for receiving the main lever;

a sub-holding member provided on one side of the main holding member, the sub-holding member having a sub-receiving groove for receiving the sub-lever;

a force application sleeve arranged in the main holding part and positioned above the main rod, wherein an inclined surface is arranged on the outer peripheral surface of the force application sleeve towards the area of the auxiliary holding part, and a guide hole is arranged on the side wall of the main holding part opposite to the inclined surface;

the positioning mechanism comprises a hollow seat, an expansion part, a first sphere and a second sphere; the expansion component is fixed on the outer side of the guide hole and comprises a plurality of expansion units, wherein the expansion units are externally surrounded by a spherical structure and internally surrounded by a conical hole; the hollow seat is arranged on the auxiliary retaining component and faces the expansion component, a spherical cavity is formed in the hollow seat, and the expansion component extends into the spherical cavity; the first sphere is positioned in the guide hole, and the second sphere is positioned in the conical hole of the expansion part;

a first pressing member provided in the main holding member, the first pressing member being screwed to press the force application sleeve downward so that the force application sleeve is pushed against the first ball and the second ball by the slant engagement, the second ball being fixed to the hollow seat by being engaged with the tapered hole to force the expansion member to expand;

a second pressing member provided in the main holding member for pressing the main lever;

a third pressing member provided in the sub-holding member for pressing the sub-lever;

a first bone screw attached to a bottom of the primary retention member.

Preferably, the positioning mechanism further comprises a force transmission shaft; the force transmission shaft is arranged between the first sphere and the second sphere; the force transmission shaft comprises a first shaft body and a second shaft body; the first shaft body is positioned on one side of the first sphere, and the second shaft body is positioned on one side of the second sphere;

a boss is formed on the end face of the first shaft body, which faces the second shaft body, a first counter bore is formed on the boss, and a second counter bore is formed on the end face of the second shaft body, which faces the first shaft body; the boss extends into the second counter bore;

a first elastic pre-tightening part is arranged between the first counter bore and the second counter bore; the first shaft body is provided with a shaft shoulder, and the guide hole is provided with a step surface for stopping the shaft shoulder.

Preferably, crisscrossed scores are arranged on the cavity wall of the spherical cavity of the hollow seat and/or the outer peripheral surface of the spherical structure of the expansion component.

Preferably, the holder further comprises a spacer member and a second resilient pretensioning member;

the pad component is arranged in the main holding component and is positioned below the main rod, the bottom of the pad component is used for being contacted with the head of the first bone nail, the upper part of the pad component is provided with a receiving groove, and the main rod falls in the receiving groove;

the second elastic pre-tightening part is arranged between the force application sleeve and the pad part and is used for pushing the pad part downwards.

Preferably, the second elastic pre-tightening parts comprise two, and the two second elastic pre-tightening parts are symmetrically arranged at two sides of the main rod; wherein:

each second elastic pre-tightening part is formed by fixing a plurality of overlapped arc-shaped elastic sheets at the end part, and the arc-shaped elastic sheets envelope the second elastic pre-tightening parts into an arc-shaped wall structure.

Preferably, a cladding sleeve is formed at the bottom of the pad component, a circumferential arrangement gap is formed in the sleeve wall of the cladding sleeve, the head of the first bone screw extends into the cladding sleeve, a conical through hole is formed at the bottom of the main holding component, and the cladding sleeve extends into the through hole.

Preferably, the expansion member includes a base portion, and tail portions of the plurality of expansion units are integrally formed with the base portion; the base portion is formed with a flange plate by which the expansion member is fixed to the main holding member.

Preferably, the second pressing part penetrates through the first pressing part and is in threaded connection with the first pressing part, and the bottom of the second pressing part is pressed against the main rod by screwing the second pressing part.

Preferably, the fixator further comprises a second bone screw selectively attachable to a bottom of the secondary retention member.

Preferably, the bottom of the force application sleeve is provided with an avoidance groove so as to avoid interference with the main rod.

Compared with the prior art, the spinal column stabilizing device provided by the embodiment of the invention has the beneficial effects that:

1. the positioning mechanism is arranged between the main holding part and the auxiliary holding part, so that the operation tool can be fixed on the auxiliary holding part only by vertically extending into the main holding part to carry out screwing operation, and the operation is simple.

2. The positioning mechanism is provided between the main holding member and the sub holding member to enable the sub holding member to perform angular adjustment in any direction, thereby enabling the sub holding member to receive the sub lever warped in each direction.

3. The force transmission shaft in the positioning mechanism is configured into two shaft bodies, and an elastic pre-tightening part is arranged between the two shaft bodies, so that the pre-positioning of the auxiliary holding part is facilitated.

Drawings

Fig. 1 is a schematic view of a prior art spinal stabilization device.

Fig. 2 is a schematic view of the structure of the spinal stabilization device provided by the present invention.

Fig. 3 is a view of the spinal stabilization device provided by the present invention in a first installed state.

Fig. 4 is an enlarged view of a portion a of fig. 3.

Fig. 5 is a B-direction view of fig. 3.

Fig. 6 is a front cross-sectional view of a positioning mechanism in a spinal stabilization device provided by the present invention.

Fig. 7 is a D-direction view of fig. 6.

Fig. 8 is a view in the direction C of fig. 3.

Fig. 9 is an E-direction view of fig. 8.

Fig. 10 is a view of the spinal stabilization device provided by the present invention in a second installed configuration.

Fig. 11 is a view of the spinal stabilization device provided by the present invention in a third installed configuration.

Fig. 12 is a view showing a state in which two bone nails are mounted to a holder in a spinal stabilization device provided by the present invention.

In the figure:

10-a primary holding member; 11-a main accommodating groove; 12-a guide hole; 13-through holes; 20-a secondary holding member; 21-an auxiliary accommodating groove; 30-force application sleeve; 31-inclined plane; 32-avoiding grooves; 40-positioning mechanism; 41-a hollow seat; 411-spherical cavity; 42-an expansion member; 421-expansion unit; 422-a tapered hole; 423-a base; 424-flange plate; 43-first sphere; 431-blocking cover; 44-a second sphere; 45-a force transmission shaft; 451-a first shaft; 452-a second shaft body; 453-a first resilient pretensioning member; 454-boss; 455-a first counterbore; 456-a second counterbore; 457-a first end face; 458-a second end face; 459-shoulder; 460-step surface; 50-pad components; 51-a receiving groove; 52-coating the sleeve; 53-opening; 54-a second resilient pretensioning member; 541-arc-shaped spring plates; 61-a first hold-down member; 611-first internal threads; 62-a second hold-down member; 621-second internal threads; 63-a third hold-down member; 631-third internal threads; 71-a first bone pin; 711-head; 72-a second bone pin; 81-a main rod; 82-secondary rod.

Description of the embodiments

The present invention will be described in detail below with reference to the drawings and detailed description to enable those skilled in the art to better understand the technical scheme of the present invention.

Embodiments of the present invention disclose a spinal stabilization device for placement on a patient's spine as an implant instrument for correcting or supporting a deformed spine. As shown in fig. 2 to 7, the spinal stabilization device includes: a main lever 81, a sub lever 82, and a plurality of holders connected in series to the main lever 81 and the sub lever 82, each holder including: the main holding member 10, the sub-holding member 20, the first bone nail 71, the urging sleeve 30, the positioning mechanism 40, the first pressing member 61, the second pressing member 62, the third pressing member 63, and the spacer member 50.

Attached to the bottom of the primary holding part 10 is a head 711 of a first bone nail 71, which first bone nail 71 is intended to be screwed into the spine for connecting the holder with the spine.

The main holding member 10 has a guide cavity extending downward from the top, a main accommodating groove 11 penetrating radially through the main holding member 10, the main accommodating groove 11 for receiving the main lever 81; the gasket member 50 is disposed at the bottom of the guide cavity of the main holding member 10, the gasket member 50 is positioned below the main rod 81 and above the head 711 of the first bone screw 71 after the main receiving groove 11 receives the main rod 81, the upper portion of the gasket member 50 has a receiving groove 51, the receiving groove 51 radially penetrates the gasket member 50, and the receiving groove 51 coincides with the penetrating direction of the main receiving groove 11, so that the receiving groove 51 is used for receiving the main rod 81 after the main rod 81 enters the main receiving groove 11; the bottom of the spacer member 50 is adapted to act on the head 711 of the first bone screw 71 for locking the first bone screw 71.

As shown in fig. 3, the force application sleeve 30 is provided in the guide chamber of the main holding member 10, and the force application sleeve 30 is movable in the vertical direction, the force application sleeve 30 being located above the main lever 81; a first internal thread 611 is provided on the cavity wall of the upper portion of the guide cavity, and a first pressing member 61 having a screwing operation portion (e.g., a hexagonal hole) on the top surface is provided in the main holding member 10 located above the force application sleeve 30 and is engaged with the first internal thread 611, so that the first pressing member 61 can be screwed by directly extending a screwing operation tool from the top of the main holding member 10 into the screwing operation portion of the first pressing member 61, so that the first pressing member 61 is pushed down against the force application sleeve 30.

The auxiliary holding member 20 is located at one side of the main holding member 10 (as shown in fig. 3, the auxiliary holding member 20 is located at the right side of the main holding member 10), the auxiliary holding member 20 also has a guide cavity extending downward from the top and an auxiliary receiving groove 21 penetrating the auxiliary holding member 20 radially, the auxiliary receiving groove 21 for receiving the auxiliary lever 82; and a third female screw 631 is formed on the cavity wall of the upper portion of the guide cavity, after the sub-receiving groove 21 receives the sub-rod 82, as shown in fig. 2, the third pressing member 63 having a screw operation portion on the top surface is provided in the sub-holding member 20 and is engaged with the third female screw 631, so that the third pressing member 63 can be screwed by directly inserting the screw operation tool into the screw operation portion of the third pressing member 63 from the top of the sub-holding member 20, thereby pressing the bottom of the third pressing member 63 against the sub-rod 82.

As shown in fig. 3, the middle part of the first compression member 61 is provided with an axially penetrating hole, the hole wall of the hole is provided with a second internal thread 621, the second compression member 62 is screwed into the hole and forms a threaded fit with the second internal thread 621, the top surface of the second compression member 62 is also provided with a screwing operation part, the second compression member 62 is screwed by extending a screwing operation tool from the top of the main holding member 10 into the screwing operation part of the second compression member 62, so that the second compression member 62 compresses the main rod 81, and pressure is transmitted to the cushion member 50 by the main rod 81, so that the cushion member 50 compresses the head 711 of the first bone screw 71, and the first bone screw 71 is fixed with the main holding member 10.

In the present invention, as shown in fig. 3 to 7, a positioning mechanism 40 is provided between the main holding member 10 and the sub-holding member 20, and the positioning mechanism 40 enables the sub-holding member 20 to be angularly adjusted with respect to the main holding member 10 in any direction so that the sub-receiving groove 21 conforms to the orientation of the sub-rod 82, thereby enabling the sub-receiving groove 21 to always conform well to the sub-rod 82. Specifically, the outer periphery of the urging sleeve 30 is provided with a slope 31 in a region facing the sub-holding member 20, the slope 31 being inclined radially inward from top to bottom, and a lateral guide hole 12 penetrating laterally is provided in a side wall of the main holding member 10 opposite to the slope 31, and the outer side of the guide hole 12 faces the sub-holding member 20. The positioning mechanism 40 comprises a hollow seat 41, an expansion part 42, a first sphere 43, a second sphere 44 and a force transmission shaft 45; the expansion member 42 is fixed to the outer side of the side wall of the main holding member 10 and in a region opposite to the guide hole 12, the expansion member 42 includes a base portion 423 and a plurality of expansion units 421 circumferentially arranged, the plurality of expansion units 421 are integrally formed with the base portion 423 at the tail portion, the plurality of expansion members 42 are externally surrounded by a spherical structure and internally surrounded by a tapered hole 422, the large hole end of the tapered hole 422 faces the guide hole 12 and penetrates the guide hole 12, a flange 424 is further formed on the base portion 423, and the expansion member 42 is fixed to the main holding member 10 by the flange 424; a hollow seat 41 is provided on the outer side of the side wall of the sub holding member 20 and fixedly connected with the sub holding member 20 by a fastener, the hollow seat 41 is opposite to the expansion member 42, a spherical cavity 411 is formed in the hollow seat 41, the spherical structure of the expansion member 42 extends into the spherical cavity 411 of the hollow seat 41, which enables the hollow seat 41 to rotate in an arbitrary direction with respect to the expansion member 42; the force transmission shaft 45 is located in the guide hole 12, the first ball 43 is located between the force transmission shaft 45 and the inclined surface 31 of the force application sleeve 30, and the second ball 44 is located between the force transmission shaft 45 and the tapered hole 422. As shown in fig. 3, when the first pressing member 61 does not drive the force application sleeve 30 to move downward or the displacement of the force application sleeve 30 to move downward is small, the first ball 43 is not subjected to the lateral force or is subjected to only a small lateral driving force, the lateral force transmitted from the first ball 43 to the second ball 44 through the force transmission shaft 45 is 0 or small, at this time, the second ball 44 cannot force the expansion unit 421 of the expansion member 42 to expand, and thus, at this time, the hollow seat 41 can be rotated in an arbitrary direction with respect to the expansion member 42, and thus, at this time, the sub-holding member 20 can be adjusted in an arbitrary direction with respect to the main holding member 10; as shown in fig. 10, when the first pressing member 61 drives the force application sleeve 30 to move downward by a large displacement so that the inclined surface 31 of the force application sleeve 30 forces the first sphere 43 to move laterally toward the hollow seat 41, the first sphere 43 transmits lateral movement to the second sphere 44 via the force transmission shaft 45, so that the second sphere 44 moves toward the hollow seat 41, thereby forcing the expansion member 42 to expand and fix with the hollow seat 41, thereby restricting rotation of the sub-holding member 20 in any direction relative to the main holding member 10. Preferably, a blocking cover 431 is provided at the inner end of the guide hole 12, the blocking cover 431 being used to limit the first sphere 43 to prevent the first sphere 43 from coming out of the inside of the guide hole 12 before the force application sleeve 30 is not fitted into the main holding member 10. Preferably, the bottom of the force application sleeve 30 is provided with a relief groove 32, and the relief groove 32 is used to avoid interference with the main lever 81 after the force application sleeve 30 moves downward.

Based on the above, the angle adjustment in any direction can be performed on the sub-holding member 20 before screwing (screwing) the first pressing member 61 (moving the first pressing member 61 downward), and after screwing and screwing the first pressing member 61, the sub-holding member 20 can be stably held at the adjusted angle. Thus, the secondary retention member 20 may be angularly adjusted to conform to the secondary rod 82 prior to tightening the first compression member 61 so that the secondary rod 82 is better engaged with the secondary receiving groove 21.

In order to improve the firmness between the expansion member 42 and the hollow seat 41, criss-cross scores are provided on the cavity wall of the spherical cavity 411 of the hollow seat 41 and/or on the outer peripheral surface of the spherical structure of the expansion member 42, and the scores can significantly increase the friction between the expansion member 42 and the hollow seat 41, and thus can significantly improve the firmness between the expansion member 42 and the hollow seat 41.

In some preferred embodiments, as shown in fig. 4 in combination with fig. 3, the force transmission shaft 45 is configured as a split structure, and in particular, the force transmission shaft 45 includes: the first shaft body 451 and the second shaft body 452, the first shaft body 451 and the second shaft body 452 are coaxially arranged, the first shaft body 451 is located at one side of the first sphere 43, the second shaft body 452 is located at one side of the second sphere 44, and a first elastic pre-tightening member 453 is arranged between the first shaft body 451 and the second shaft body 452, preferably, a columnar spring is selected as the first elastic pre-tightening member 453. Specifically, a boss 454 is provided on a first end surface 457 of the first shaft body 451 facing the end of the second shaft body 452, and a first counterbore 455 is provided on the boss 454, and a second counterbore 456 is provided on a second end surface 458 of the second shaft body 452 facing the first shaft body 451, and the boss 454 is made to extend into the second counterbore 456; first resilient pretensioning member 453 is disposed between first counterbore 455 and second counterbore 456. The first shaft body 451 is provided with a shoulder 459 facing the main holding member 10, and the guide hole 12 is provided with a stepped surface 460 facing the shoulder 459, and the stepped surface 460 is used to limit the first shaft body 451 by stopping the shoulder 459. In this way, when the first pressing member 61 is not screwed, the first elastic pre-tightening member 453 applies a certain elastic pre-tightening force to the second shaft body 452, so that the second shaft body 452 pushes against the second sphere 44 with a certain pre-tightening force, so that the second sphere 44 makes the expansion member 42 contact with the hollow seat 41 with a certain pre-tightening force by cooperating with the tapered hole 422, at this time, a certain damping is applied when adjusting the angle of the auxiliary holding member 20, which damping makes the auxiliary holding member 20 to be kept at the adjusted angle after adjustment, which is beneficial to pre-positioning the auxiliary holding member 20; as shown in fig. 10, during screwing of the first pressing member 61, the first ball 43 drives the first shaft body 451 by engaging with the inclined surface 31, the first shaft body 451 approaches the second shaft body 452 by continuously compressing the first elastic pre-tightening member 453, and finally, the first end surface 457 of the first shaft body 451 is abutted with the second end surface 458 of the second shaft body 452, so that the two shaft bodies move synchronously toward the second ball 44, and finally, the second ball 44 forces the expansion member 42 to be fixed with the hollow seat 41 by expansion, so that the sub holding member 20 obtains final positioning and fixing. In addition, since the first shaft body 451 is restrained by the shoulder 459 engaging with the stepped surface 460, the force from the second ball 44 is not transmitted to the first ball 43 through the second shaft body 452 and the first shaft body 451, and thus the first ball 43 is hardly stressed before the sub holding member 20 is not fixed, and the first ball 43 does not exert a pressing force on the inclined surface 31.

In some preferred embodiments, as shown in fig. 3, the bottom of the pad member 50 is formed with a covering sleeve 52, the sleeve wall of the covering sleeve 52 is provided with circumferentially arranged notches 53, the head 711 of the first bone screw 71 extends into the covering sleeve 52, the bottom of the main holding member 10 is provided with a tapered through hole 13, and the covering sleeve 52 extends into the through hole 13. In this manner, the spherical head 711 of the first bone screw 71 is movable with respect to the sheath 52 before the second pressing member 62 presses the main rod 81, and thus the first bone screw 71 can be angularly adjusted in any direction with respect to the main holding member 10, so that the first bone screw 71 can always be screwed into the spine at an appropriate angle; as shown in fig. 11, during the pressing of the main rod 81 by the second pressing member 62, the packing member 50 is pressed downward by the main rod 81 to slightly move the covering sleeve 52 downward, which causes the hole wall of the through hole 13 of the main holding member 10 to generate a radial force on the covering sleeve 52, thereby locking the head 711 of the first bone nail 71 by the covering sleeve 52, and thus, the first bone nail 71 can be fixed at an adjusted angle.

In some more preferred embodiments, as shown in fig. 3, 8 and 9, a second elastic pre-tightening member 54 is disposed between the force application sleeve 30 and the pad member 50, specifically, the second elastic pre-tightening member 54 includes two, two second elastic pre-tightening members 54 are symmetrically disposed at two sides of the main rod 81; each second elastic pre-tightening element 54 is formed by fixing a plurality of superposed arc-shaped elastic sheets 541 at the end, and the plurality of arc-shaped elastic sheets 541 envelop the second pre-tightening elements into an arc-shaped wall structure, so that the structure and arrangement manner are beneficial to avoiding the main rod 81. As can be seen from the above, the second elastic pre-tightening member 54 applies a pre-tightening force to the cushion member 50 before the second pressing member 62 presses the main rod 81, so that the cover 52 covers the head 711 of the first bone nail 71 with a pre-tightening force, which is advantageous for pre-positioning the first bone nail 71 at an adjustment angle, so that a complete free rotation between the main holding member 10 and the first bone nail 71 is avoided.

In some preferred embodiments, as shown in fig. 12, the bottom of the secondary retention element 20 is also attached with bone nails, i.e., second bone nails 72, which second bone nails 72 are also used to screw into the spine to meet the correction and support requirements in some cases. The bottom of the secondary retention member 20 may be provided in the same configuration as the bottom of the primary retention member 10 for attaching the head of the second bone screw 72, although other configurations for attaching the head of the second bone screw 72 are possible.

The operation of the above-described spinal stabilization device for implanting the fixation device into the spinal column is described below.

First, the receiving grooves of two holding members in the holder are left open (i.e., three pressing members are not disposed in the receiving grooves first), and the first bone nail 71 is attached to the bottom of the main holding member 10 in advance.

Then, the first bone screw 71 is screwed into the spine by a screwing operation tool that directly protrudes from the incision into the main holding member 10 and into a screwing operation portion (for example, hexagonal countersink) of the head 711 of the first bone screw 71, and screwing the first bone screw 71.

Then, as shown in fig. 3, the main lever 81 is dropped into the main accommodation groove 11, then, the urging sleeve 30 is fitted into the main holding member 10, then, the first pressing member 61 and the second pressing member 62 in the fitted state are fitted into the main holding member 10, and both pressing members are brought into the unscrewed state, that is, the first pressing member 61 is ensured not to urge the urging sleeve 30, and the second pressing member 62 is ensured not to urge the main lever 81, at this time, the sub holding member 20 is brought into the angle-adjustable state, and the main holding member 10 is brought into the angle-adjustable state with respect to the first bone nail 71.

Then, the angle of the sub holding member 20 is adjusted so that the sub receiving groove 21 conforms to the trend of the sub rod 82, and then, the sub rod 82 is dropped into the sub receiving groove 21 of the sub holding member 20, and if the sub rod 82 does not completely coincide with the sub receiving groove 21 after it is dropped into the sub receiving groove 21, the angle of the sub holding member 20 is finely adjusted until it completely coincides.

Then, the first pressing member 61 is screwed by the screwing operation tool being directly inserted into the main holding member 10 from the slit and into the screwing operation portion of the first pressing member 61, as shown in fig. 10, so that the urging sleeve 30 presses the first ball 43 by the inclined surface 31, thereby finally fixing the sub holding member 20.

Then, as shown in fig. 11, the second pressing member 62 is screwed with the screwing tool inserted into the main holding member 10 so that the second pressing member 62 presses the main lever 81 and simultaneously locks and fixes the first bone nail 71.

Finally, the third pressing member 63 is mounted on the sub-holding member 20, and the third pressing member 63 is moved downward by screwing the third pressing member 63 by a screwing tool, so that the third pressing member 63 presses and fixes the sub-lever 82.

The key advantages of the spinal stabilization device provided by the invention are at least:

1. by providing the positioning mechanism 40 between the main holding member 10 and the sub-holding member 20, the operation tool can be fixed to the sub-holding member 20 by simply extending vertically into the main holding member 10 for screwing operation, and the operation is simple.

2. The positioning mechanism 40 is provided between the main holding member 10 and the sub-holding member 20 to enable the sub-holding member 20 to perform angular adjustment in any direction, thereby enabling the sub-holding member 20 to receive the sub-lever 82 warped in each direction.

3. The force transmission shaft 45 in the positioning mechanism 40 is configured as two shafts, and an elastic pre-tightening member is provided between the two shafts, thereby facilitating the pre-positioning of the sub-holding member 20.

The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, the scope of which is defined by the claims. Various modifications and equivalent arrangements of this invention will occur to those skilled in the art, and are intended to be within the spirit and scope of the invention.

Claims

1. A spinal stabilization device comprising a rod-like member and a plurality of anchors connected in series to the rod-like member, the rod-like member comprising a primary rod and a secondary rod disposed side-by-side, the anchors comprising:

a first bone screw attached to a bottom of the primary retention member.

2. The spinal stabilization device of claim 1 wherein the positioning mechanism further comprises a force transmission shaft; the force transmission shaft is arranged between the first sphere and the second sphere; the force transmission shaft comprises a first shaft body and a second shaft body; the first shaft body is positioned on one side of the first sphere, and the second shaft body is positioned on one side of the second sphere;

3. The spinal stabilization device of claim 1 wherein crisscrossed indentations are provided on the walls of the spherical cavity of the hollow seat and/or on the outer circumferential surface of the spherical structure of the expansion component.

4. The spinal stabilization device of claim 1 wherein the fixation device further comprises a spacer member and a second resilient pretension member;

5. The spinal stabilization device of claim 4 wherein the second resilient pre-tightening members comprise two, the two second resilient pre-tightening members being symmetrically disposed on either side of the primary rod; wherein:

6. The spinal stabilization device of claim 4 wherein the bottom of the spacer member is formed with a covering sleeve having circumferentially arranged openings in a sleeve wall, the head of the first bone screw extending into the covering sleeve, the bottom of the primary retention member defining a tapered through bore, the covering sleeve extending into the through bore.

7. The spinal stabilization device of claim 1 wherein the expansion component comprises a base portion with which tail portions of a plurality of the expansion units are integrally formed; the base portion is formed with a flange plate by which the expansion member is fixed to the main holding member.

8. The spinal stabilization device of claim 1 wherein the second compression member passes through and is threadably connected to the first compression member such that the bottom of the second compression member is compressed against the stem by threading the second compression member.

9. The spinal stabilization device of claim 1 wherein the anchor further comprises a second bone pin selectively attachable to a bottom of the secondary retention component.

10. The spinal stabilization device of claim 1 wherein the bottom of the force application sleeve is provided with a relief groove to avoid interference with the primary rod.