CN213098237U - Vertebral pedicle screw capable of swinging in sagittal plane - Google Patents

Abstract

The utility model relates to a can be at sagittal plane wobbling pedicle of vertebral arch screw, including screw seat, midbody to and utilize the midbody to install the bulb bone nail in the screw seat, be provided with the abnormal shape hole in the screw seat, and the abnormal shape hole is with the left and right symmetrical shape that sagittal plane direction is the symmetry axis, and the midbody is cyclic annular structure, and its periphery be with abnormal shape hole complex abnormal shape structure, the bulb both sides of bulb bone nail are provided with the inner wall and are planar spill platform, the bottom both sides of midbody be provided with the inner wall for the plane and with spill platform complex arch. The utility model discloses can restrict the mobility of bulb bone nail on coronal plane, guarantee the degree of freedom of bulb bone nail at the sagittal plane to when can be favorable to bearing and the conduction of power, overcome the problem of connective bar installation difficulty.

Description

Vertebral pedicle screw capable of swinging in sagittal plane

Technical Field

The utility model belongs to the technical field of the pedicle of vertebral arch screw, concretely relates to can be at sagittal plane wobbling pedicle of vertebral arch screw.

Background

The existing pedicle screws for the posterior spinal rod internal fixation operation mainly comprise uniaxial pedicle screws and universal pedicle screws; when the single-shaft pedicle screw is used for fixing three centrums and more than three centrums, the U-shaped groove of the screw is not on the same plane after the pedicle screw is implanted into the centrum, so that the connecting rod is particularly difficult to place in the U-shaped groove, and the operation risk is increased. Although the universal pedicle screw overcomes the defects, the universal pedicle screw is not suitable for scoliosis orthopedic surgery due to the universal characteristic and unfavorable for bearing and transmitting force. The deformed vertebral body needs to be corrected during scoliosis operation, and the universal characteristic of the universal pedicle screw has the problem that the correction effect is lost during or after the operation.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a can be at sagittal plane wobbling pedicle of vertebral arch screw to solve the problem that connective bar installation difficulty and orthopedic effect are lost.

The utility model discloses a can be at sagittal plane wobbling pedicle of vertebral arch screw is realized like this:

the utility model provides a can be at sagittal plane wobbling pedicle of vertebral arch screw, includes screw base, midbody, and utilizes the midbody is installed bulb bone screw in the screw base, wherein, be provided with the abnormal shape hole in the screw base, just the abnormal shape hole is with sagittal plane direction left and right symmetrical shape as the symmetry axis, the midbody is cyclic annular structure, and its periphery be with the abnormal shape structure that the abnormal shape hole matches, bulb both sides of bulb bone screw are provided with the inner wall and are planar spill platform, the bottom both sides of midbody be provided with the inner wall for the plane and with spill platform complex arch.

Further, the special-shaped holes are symmetrical by taking the horizontal plane direction as a symmetry axis.

Further, the inner diameter of the special-shaped hole in the sagittal plane direction is larger than the diameter of the special-shaped hole in the coronal plane direction.

Furthermore, the bottom of the screw seat is provided with a tapered hole which has a large inner diameter and a small inner diameter and is communicated with the special-shaped hole, and the diameter of the ball head is larger than the inner diameter of the bottom of the tapered hole.

Furthermore, the two sides of the middle body are respectively provided with a sunk groove, and the side surfaces of the two sides of the screw seat are respectively provided with a riveting hole opposite to the sunk groove.

Furthermore, the front side and the rear side of the top of the middle body are respectively provided with a C-shaped groove.

Furthermore, the screw seat is of a U-shaped structure, and internal threads are arranged on the inner walls of the two guide arms.

After the technical scheme is adopted, the utility model discloses the beneficial effect who has does:

the utility model discloses an intermediate periphery is heterotypic structure, and its and the inside heterotypic hole cooperation of screw seat can restrict the mobility of bulb bone nail on the horizontal plane to through the cooperation of arch and spill platform, guarantee the degree of freedom of bulb bone nail at the sagittal plane, thereby can be favorable to bearing and the conduction of power, be applicable to orthopedic operation, and can also overcome the problem of connective bar installation difficulty.

Drawings

The present invention will be further explained with reference to the drawings and examples.

FIG. 1 is a block diagram of a preferred embodiment pedicle screw of the invention that is oscillatable in the sagittal plane;

FIG. 2 is an exploded view of a preferred embodiment pedicle screw of the invention, which is oscillatable in the sagittal plane;

FIG. 3 is a cross-sectional view of a preferred embodiment of the present invention in the sagittal plane of the oscillating pedicle screw horizontal plane;

FIG. 4 is an enlarged view of portion A of FIG. 3;

FIG. 5 is a sagittal view in section of a preferred embodiment of the pedicle screw of the invention in the sagittal plane;

FIG. 6 is a cross-sectional view of a preferred embodiment of the present invention in the coronal plane with a sagittal pedicle screw positioned in the location of the staking hole;

FIG. 7 is a cross-sectional view of the preferred embodiment of the present invention in the horizontal plane of the screw base of a pedicle screw that oscillates in the sagittal plane;

FIG. 8 is a top view of the screw base of a pedicle screw of the preferred embodiment of the invention, which is swingable in the sagittal plane;

FIG. 9 is a block diagram of the middle body of a pedicle screw that can swing in the sagittal plane according to a preferred embodiment of the invention;

FIG. 10 is a top view of the ball head fixation of a sagittal pedicle screw of the preferred embodiment of the invention;

in the figure: the screw base comprises a screw base 1, a special-shaped hole 11, a tapered hole 12, a riveting hole 13, an inner protrusion 14, a guide arm 15, an inner thread 16, a middle body 2, a protrusion 21, a sinking groove 22, a C-shaped groove 23, a ball head bone nail 3, a ball head 31, a concave platform 32 and a plane 4.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1-10, a pedicle screw capable of swinging in a sagittal plane comprises a screw seat 1, a middle body 2, and a ball head bone screw 3 installed in the screw seat 1 by using the middle body 2, wherein a special-shaped hole 11 is formed in the screw seat 1, the special-shaped hole 11 is in a left-right symmetrical shape taking a sagittal plane direction as a symmetry axis, the middle body 2 is in a ring structure, the periphery of the middle body is in a special-shaped structure matched with the special-shaped hole 11, concave platforms 32 with inner walls being planes 4 are arranged on two sides of a ball head 31 of the ball head bone screw 3, and protrusions 21 with inner walls being planes 4 and matched with the concave platforms 32 are arranged on two sides of the bottom of the middle body.

Specifically, the bottom surface of the concave platform 32 is of an arc-shaped structure and matched with the bottom of the protrusion 21 in shape, when the pedicle screw is used, the inner wall of the planar shape of the protrusion 21 is attached to the inner wall of the planar shape of the concave platform 32, so that the ball head bone screw 3 rotates in the sagittal plane direction, and the periphery of the middle body 2 is of a special-shaped structure matched with the special-shaped hole 11, so that the freedom degrees of the whole middle body 2 and the ball head bone screw 3 in other directions such as the horizontal plane can be limited.

Preferably, the left and right sides of the special-shaped hole 11 are both arc structures.

In order to simplify the structures of the intermediate body 2 and the special-shaped holes 11 and reduce the processing difficulty, the special-shaped holes 11 are symmetrical by taking the horizontal plane direction as a symmetry axis.

Specifically, the peripheral structure of heterotypic hole 11 and midbody 2 is the same, not only can reduce the processing degree of difficulty of midbody 2 and screw seat 1, can make each partial atress of midbody 2 even moreover, prevents that pedicle of vertebral arch screw from producing the problem of deformation when using.

Since the ball stud 3 can swing in the sagittal plane during use, the inner diameter of the profiled hole 11 in the sagittal plane direction is larger than the diameter thereof in the coronal plane direction in order to increase the compressive strength in this direction.

In order to limit the ball head bone nail 3, the bottom of the screw seat 1 is provided with a tapered hole 12 which has a larger inner diameter at the top and a smaller inner diameter at the bottom and is communicated with the special-shaped hole 11, and the diameter of the ball head 31 is larger than the inner diameter of the bottom of the tapered hole 12.

Specifically, the inner diameter of one end of the tapered hole 12 facing the ball head bone screw 3 is smaller than the inner diameter of the other end of the tapered hole 12, and when the ball head 31 is installed in the screw seat 1 from the large-diameter end of the tapered hole 12, the ball head can be hung in the tapered hole 12 to prevent the ball head from falling off the screw seat 1.

The middle body 2 is used not only for ensuring the swing of the ball head bone screw 3 in the sagittal plane direction, but also for fixing the ball head 31 in the screw seat 1, so that the two sides of the middle body 2 are respectively provided with the sunken grooves 22, and the two side surfaces of the screw seat 1 are respectively provided with the riveting holes 13 opposite to the sunken grooves 22.

After the ball head bone nail 3, the screw seat 1 and the intermediate body 2 are assembled, the inner wall of the riveting hole 13 can be punched inwards in a press riveting mode to form the inner protrusion 14 clamped in the sinking groove 22, and therefore the intermediate body 2 is prevented from being pulled out of the screw seat 1.

Because pedicle screw generally need utilize the connective bar to link several together when using, and for the installation of the convenient connective bar, the top front side and the rear side of midbody 2 are provided with C type groove 23 respectively.

In order to facilitate the fixing of the connecting rod, the screw base 1 is of a U-shaped structure, and the inner walls of the two guide arms 15 are provided with internal threads 16.

The connecting rod is clamped into the U-shaped structure of the screw base, the bottom of the connecting rod is fixed in the C-shaped groove 3, and then the connecting rod is screwed into the space between the two guide arms 15 through the jackscrew, so that the connecting rod is fixed.

In particular, in this embodiment, the sagittal plane, coronal plane and horizontal plane are set when the pedicle screw is in use, i.e., when the pedicle screw is fixed to the body. For the individual pedicle screws not in use, the orientation is set to be vertical, which is shown in fig. 1, i.e. the screw seat 1 is placed upwards on the upper side and the ball head bone screw 3 on the lower side.

Therefore, when an individual pedicle screw which is not in use is assembled, the ball 31 of the ball bone screw 3 needs to be upward, the tail of the ball bone screw is downward and is arranged in the screw seat 1, then the intermediate body 2 is arranged in the screw seat 1 and is positioned in the special-shaped hole 11 in the screw seat 1, the protrusion 21 of the intermediate body 2 is matched with the concave platforms 32 on two sides of the ball 31, then the riveting hole 13 is punched by adopting a riveting tool, the inner wall of the riveting hole 13 forms the inner protrusion 14 which is matched in the sinking groove 22 of the intermediate body 2, the intermediate body 2 can be prevented from falling out, and the whole pedicle screw is assembled.

Firstly, the middle body 2 is fixed in the screw seat 1 through the matching of the inner protrusion 14 and the sinking groove 22, and due to the matching of the concave platform 32 and the protrusion 21, the protrusion 21 can play a downward limiting role on the ball head 31, so that the ball head bone nail 3 can be prevented from being upwards removed from the middle body 2 and the screw seat 1. Secondly, due to the restriction of the tapered hole 12 to the ball 31, the ball stud 3 can be prevented from coming out of the lower part of the screw seat 1. Furthermore, the special-shaped hole 11 and the peripheral structure of the middle body 21 which are symmetrical by taking the sagittal plane direction as a symmetry axis are combined with the matching of the concave platform 32 and the protrusion 21, so that the swing of the ball head bone nail 3 in the sagittal plane is realized, and the axial rotation and the swing in other directions of the ball head bone nail 3 are limited at the same time.

The utility model discloses a pedicle screw, midbody 2 adopt 4 cooperations in plane, midbody 2 and screw seat 1 to be heterotypic anchor ring cooperation with bulb bone nail 3, make each cooperation department atress even, do not have stress concentration's the condition, guarantee that each part of pedicle screw is difficult for appearing the problem of warping in the use, improved holistic intensity and the stability of pedicle screw, safe and reliable. And the utility model discloses a pedicle of vertebral arch screw uses easy and simple to handle in the operation, and the fixed effectual of postoperative can reduce patient and appear the risk that the fix with screw angle is lost, is influenced the operation effect in the postoperative.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (7)

1. The pedicle screw capable of swinging in a sagittal plane is characterized by comprising a screw seat (1), an intermediate body (2) and a ball head bone screw (3) arranged in the screw seat (1) by utilizing the intermediate body (2), wherein a special-shaped hole (11) is formed in the screw seat (1), and the special-shaped hole (11) is in a left-right symmetrical shape taking a sagittal plane direction as a symmetrical axis; the intermediate (2) is of an annular structure, and the periphery of the intermediate is of a special-shaped structure matched with the special-shaped hole (11); the ball head (31) both sides of bulb bone nail (3) are provided with inner wall for concave platform (32) of plane (4), the bottom both sides of midbody (2) be provided with the inner wall for plane (4) and with concave platform (32) complex arch (21).

2. Pedicle screw as claimed in claim 1, oscillating in the sagittal plane, characterized in that the profile hole (11) is symmetrical with respect to the axis of symmetry in the horizontal plane.

3. The sagittal oscillatable pedicle screw according to claim 1, wherein the inner diameter of the shaped bore (11) in the sagittal plane direction is larger than its diameter in the coronal plane direction.

4. The pedicle screw oscillating in the sagittal plane according to claim 1, wherein the bottom of the screw base (1) is provided with a tapered hole (12) with a larger inner diameter at the top and a smaller inner diameter at the bottom, and the ball head (31) has a larger diameter than the inner diameter of the bottom of the tapered hole (12).

5. Pedicle screw as claimed in claim 1, oscillating in the sagittal plane, characterized in that the central body (2) is provided with a respective undercut (22) on each side, and the screw base (1) is provided with a respective riveting hole (13) on each side opposite the undercut (22).

6. Pedicle screw oscillating in the sagittal plane, according to claim 1, characterized in that the top front and rear sides of the central body (2) are provided with C-shaped grooves (23), respectively.

7. The sagittal oscillating pedicle screw according to claim 1, wherein the screw base (1) is of a U-shaped configuration, the inner walls of the two guide arms (15) of which are provided with an internal thread (16).

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