CN217430138U - Anterior cervical fixing device - Google Patents

Abstract

A cervical vertebra anterior fixing device comprises a fixing plate, wherein the fixing plate is provided with screw holes penetrating through two sides of the fixing plate, the hole walls of the screw holes are provided with internal threads, adjustable screws or locking screws can be selectively penetrated through the screw holes, each adjustable screw comprises a first screw head and a first stud connected with the first screw head, the first screw head is in rotating fit with the screw holes, and the first screw head can rotate in the screw holes to adjust the implantation angle of the first stud; the locking screw comprises a second screw head and a second stud connected with the second screw head; the second screw head is provided with an external thread matched with the internal thread, and the second screw head is in threaded fit with the screw hole so as to fix the implantation angle of the second stud. The device can cooperate with adjustable screw to constitute half restriction type structure, can cooperate with the locking screw again to constitute restriction type structure, cooperates with adjustable screw and locking screw simultaneously and constitutes mixed type structure to the cooperation of fixed plate and locking screw is firm, and it is effectual to implant the back operation.

Description

Anterior cervical fixing device

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to an anterior cervical fixing device.

Background

With the development of orthopedic medical technology, the application of orthopedic medical implants is more and more extensive. In cervical intervertebral disc degenerative diseases, cervical spondylolisthesis, cervical spinal canal stenosis, cervical vertebra tumor, cervical vertebra joint fusion failure, cervical vertebra pseudoarthropathy, cervical vertebra malformation and other cervical vertebra diseases. Adopting anterior cervical fixing plate to carry out internal fixation to the cervical vertebra is better treatment, and this operation can not only be effectual subtract the oppression from the spinal canal the place ahead, can guarantee the stability of bone grafting interface and fixed segment moreover, promotes the bone grafting piece to fuse, maintains the natural physiology curvature of pathological change cervical vertebra effectively, resumes the normal physiology function of cervical vertebra.

The screw that present anterior cervical spine fixed plate used is mostly adjustable angle type screw and fixed angle type screw, and the screw combination of different forms can form restriction type, half restriction type and mixed type assembly effect. But traditional anterior cervical spine fixed plate is poor with fixed angle type screw complex stability, and fixed angle type screw is easy relative fixed plate after implanting and is rocked, influences the operation effect after the implantation.

SUMMERY OF THE UTILITY MODEL

Therefore, there is a need for an anterior cervical fixing device, in which a fixing plate of the anterior cervical fixing device can be matched with an adjustable screw to form a semi-restricted structure, can be matched with a locking screw to form a restricted structure, can be matched with the adjustable screw and the locking screw to form a mixed structure, and has stable matching with the locking screw and good post-implantation surgical effect.

On one hand, the application provides a cervical vertebra anterior fixing device, which comprises a fixing plate, wherein the fixing plate is provided with screw holes penetrating through two sides of the fixing plate, the hole walls of the screw holes are provided with internal threads, adjustable screws or locking screws can be selectively penetrated through the screw holes, each adjustable screw comprises a first screw head and a first stud connected with the first screw head, the first screw head is in rotating fit with the screw holes, and the first screw head can rotate in the screw holes to adjust the implantation angle of the first stud; the locking screw comprises a second screw head and a second stud connected with the second screw head; the second screw head is provided with an external thread matched with the internal thread, and the second screw head is in threaded fit with the screw hole so as to fix the implantation angle of the second stud.

The technical solution of the present application is further described below:

in one embodiment, the fixing plate is provided with at least two screw holes along the width direction, the at least two screw holes form a row of screw hole groups, and the fixing plate is provided with a plurality of rows of screw hole groups at intervals along the length direction.

In one embodiment, in the same row of screw hole groups, a pressing member is arranged between two adjacent screw holes, and the pressing member is used for limiting the adjustable screw or the locking screw in the screw hole.

In one embodiment, the pressing member is provided with a convex portion and a concave portion along a circumferential direction, the pressing member can rotate relative to the fixing plate to switch an avoidance state and a pressing state, and in the avoidance state, the concave portion corresponds to the screw hole to avoid the adjustable screw or the locking screw; in the compression state, the convex part corresponds to the screw hole and shields the screw hole so as to limit the adjustable screw or the locking screw in the screw hole.

In one embodiment, the pressing member is provided with two convex portions and two concave portions, the two convex portions are symmetrically arranged along the circumference, and the two concave portions are symmetrically arranged along the circumference.

In one embodiment, all of the screw holes are penetrated by the adjustable screws.

In one embodiment, all of the screw holes are drilled through the locking screw.

In one embodiment, a part of the screw holes of all the screw holes is penetrated by the adjustable screw, and another part of the screw holes is penetrated by the locking screw.

In one embodiment, the fixing plate is further provided with perspective windows penetrating through two sides of the fixing plate.

In one embodiment, the fixing plate has a cross section in the width direction and a cross section in the length direction having a curvature.

Above-mentioned anterior cervical vertebra fixing device is through seting up the screw hole at the fixed plate to configure the screw hole into can wear to establish adjustable screw and can wear to establish locking screw again, when clinical use, the doctor can select to use adjustable screw or locking screw to fix the fixed plate according to clinical needs, has improved anterior cervical vertebra fixing device's use flexibility. And the first spiral shell head of adjustable screw can with screw hole normal running fit to when implanting adjustable screw, the doctor can adjust adjustable screw to the suitable angle of implantation according to clinical need, so that carry out the internal fixation to the cervical vertebra better, improved the operation effect. And the second spiral shell head of locking screw is equipped with the external screw thread to the external screw thread of second spiral shell head and the internal thread phase-match in the screw hole, thereby through the external screw thread on second spiral shell head surface and the internal thread fit in the screw hole, guaranteed that locking screw can implant according to predetermined fixed angle, avoided the implantation in-process or implant back locking screw and rocked, improved locking screw's locking steadiness, and then improved the operation effect.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic view of an embodiment of an anterior cervical fixation device;

FIG. 2 is a top view of the anterior cervical fixation device shown in FIG. 1;

FIG. 3 is a cross-sectional view of the anterior cervical fixation device shown in FIG. 2 at section A-A;

FIG. 4 is a schematic structural view of a locking screw according to an embodiment;

FIG. 5 is a schematic view of an anterior cervical fixation device in accordance with another embodiment;

FIG. 6 is a top view of the anterior cervical fixation device shown in FIG. 5;

FIG. 7 is a cross-sectional view of the anterior cervical fixation device shown in FIG. 6, taken at section B-B;

fig. 8 is a schematic structural diagram of an adjustable screw according to an embodiment.

Description of reference numerals:

10. a fixing plate; 11. screw holes; 12. a see-through window; 20. a locking screw; 21. a second screw head; 22. a second stud; 30. an adjustable screw; 31. a first screw head; 32. a first stud; 40. a compression member; 41. a recess; 42. a convex portion.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

An embodiment of the application provides an anterior cervical fixing device for internal fixation of cervical vertebrae. Referring to fig. 1 to 8, in particular, the anterior cervical spine fixation device of an embodiment includes a fixation plate 10, the fixation plate 10 is provided with screw holes 11 penetrating through two sides of the fixation plate 10, the hole wall of the screw holes 11 is provided with internal threads, the screw holes 11 can selectively penetrate through adjustable screws 30 or locking screws 20, wherein the adjustable screws 30 include first screw heads 31 and first screw studs 32 connected to the first screw heads 31, the first screw heads 31 are rotatably matched with the screw holes 11, and the first screw heads 31 can rotate in the screw holes 11 to adjust an implantation angle of the first screw studs 32. The locking screw 20 comprises a second screw head 21 and a second stud 22 connected with the second screw head 21; the second screw head 21 is provided with an external thread matched with the internal thread, and the second screw head 21 is in threaded fit with the screw hole 11 to fix the implantation angle of the second stud 22. Wherein, the implantation angle of the first stud 32 refers to the inclination angle of the first stud 32 relative to the cervical vertebrae when implanted in the cervical vertebrae. Similarly, the implantation angle of the second stud 22 refers to the angle of inclination of the second stud 22 relative to the cervical vertebrae when implanted therein.

Understandably, the first stud 32 of the adjustable screw 30 is used to pass through the screw hole 11 and implant into the cervical vertebrae of the patient to fix the fixing plate 10 relative to the cervical vertebrae, and the first stud 32 is provided with a thread for locking the cervical vertebrae. The first screw head 31 has a diameter larger than the bottom opening of the screw hole 11, and the first screw head 31 is disposed in the screw hole 11 so as to prevent the adjustable screw 30 from being separated from the screw hole 11. Preferably, the first screw head 31 can be rotated 360 ° in the screw hole 11, so that the implantation angle of the adjustable screw 30 can be arbitrarily adjusted by the doctor according to the clinical requirement, so as to better perform the internal fixation of the cervical vertebrae. It should be appreciated that in another embodiment, the adjustable screw 30 may be configured to rotate in a certain angular range, thereby reducing the difficulty of the surgeon's surgical operation.

Similarly, the second stud 22 of the locking screw 20 is also provided with a thread for locking the cervical vertebrae. The second stud 22 is also used to implant the patient's cervical vertebrae through the screw hole 11 to fix the fixation plate 10 relative to the cervical vertebrae. The diameter of the second screw head 21 is larger than the bottom opening of the screw hole 11, and the second screw head 21 is disposed in the screw hole 11, thereby preventing the adjustable screw 30 from being separated from the screw hole 11. Further, through the matching of the external thread on the surface of the second screw head 21 and the internal thread in the screw hole 11, the locking screw 20 can be implanted at a preset fixed angle, for example, the locking screw 20 is implanted perpendicular to the surface of the cervical vertebra, the locking screw 20 is prevented from shaking in the implantation process or after the locking screw is implanted, and the implantation effect is improved.

Above-mentioned anterior cervical vertebra fixing device is through seting up screw hole 11 at fixed plate 10 to dispose screw hole 11 into can wear to establish adjustable screw 30 and can wear to establish locking screw 20 again, when clinical use, the doctor can select to use adjustable screw 30 or locking screw 20 to fix fixed plate 10 according to clinical needs, has improved anterior cervical vertebra fixing device's use flexibility. And the first screw head 31 of the adjustable screw 30 can be matched with the screw hole 11 in a rotating way, so that when the adjustable screw 30 is implanted, a doctor can adjust the adjustable screw 30 to a proper implantation angle according to clinical requirements, the cervical vertebra can be better fixed internally, and the operation effect is improved. And the second spiral shell head 21 of locking screw 20 is equipped with the external screw thread to the external screw thread of second spiral shell head 21 and the internal thread phase-match in the screw hole 11, thereby the external screw thread through second spiral shell head 21 surface and the internal thread fit in the screw hole 11, guaranteed that locking screw 20 can implant according to predetermined fixed angle, avoided implanting the in-process or implant back locking screw 20 and rocked, improved locking screw 20's locking steadiness, and then improved the operation effect.

Further, referring to fig. 7 and 8, the first screw head 31 includes a first spherical surface, preferably, the first spherical surface is a smooth hemispherical surface, the cross-sectional shape of the screw hole 11 matches the shape of the first spherical surface, and the first spherical surface is in rotational contact with the hole wall of the screw hole 11, so that the first screw head 31 can rotate 360 ° in the screw hole 11 to adjust the implantation angle of the first stud 32 by the spherical first screw head 31 matching with the spherical screw hole 11.

Referring to fig. 3 and 4, the second screw head 21 includes a second spherical surface. Preferably, the diameter of the second spherical surface is the same as that of the first spherical surface, so that the screw hole 11 can be adapted to the first screw head 31 and the second screw head 21, thereby ensuring that the screw hole 11 can be provided with the adjustable screw 30 and the fixing screw. Further, the external thread is arranged on the second spherical surface, and the second spherical surface is in threaded connection with the hole wall of the screw hole 11, so that the locking screw 20 is stably connected with the fixing plate 10.

Further, referring to fig. 1 and 2, the fixing plate 10 is formed with a plurality of screw holes 11, and a fixing screw or an adjustable screw 30 is inserted into each of the screw holes 11, thereby improving the stability of the fixing plate 10. Specifically, at least two screw holes 11 are formed in the fixing plate 10 along the width direction, a row of screw hole groups is formed by the at least two screw holes 11, and a plurality of rows of screw hole groups are arranged at intervals along the length direction of the fixing plate 10. For example, in the present embodiment, two screw holes 11 are opened in the fixing plate 10 along the width direction, the two screw holes 11 form a row of screw hole sets, three rows of screw hole sets are provided in the fixing plate 10 along the length direction at intervals, that is, 2 × 3 screw holes 11 are opened in the fixing plate 10, and each screw hole 11 can be penetrated by a fixing screw or an adjustable screw 30. Understandably, in other embodiments, the number of rows of screw hole sets may be more or less, and the number of screw holes 11 in each row of screw hole sets is not limited to two.

Referring to fig. 1 to 4, in an embodiment, all the screw holes 11 are provided with adjustable screws 30, so that the fixing plate 10 and the adjustable screws 30 cooperate to form a semi-limited anterior cervical fixing device, and the implantation angles of all the screws can be adjusted during implantation, which is flexible to use.

Referring to fig. 5 to 8, in another embodiment, all the screw holes 11 are penetrated by the locking screws 20, so that the fixing plate 10 and the locking screws 20 cooperate to form a limited anterior cervical fixing device, resulting in better stability of the anterior cervical fixing device.

Of course, in other embodiments, a part of the screw holes 11 of all the screw holes 11 may be penetrated by the adjustable screws 30, and another part of the screw holes 11 may be penetrated by the locking screws 20. Thereby forming a mixed type anterior cervical fixing device, not only enabling the implantation angle of part of screws to be adjusted, but also enabling the other part of screws to be stably connected, and further taking into account the flexibility and the stability.

Referring to fig. 2, a movable pressing member 40 is disposed on the fixing plate 10, and the pressing member 40 is used for limiting the adjustable screw 30 or the locking screw 20 in the screw hole 11. Preferably, the pressing member 40 is disposed between two adjacent screw holes 11 in the same row of screw hole groups, so that two screws can be simultaneously limited by one pressing member 40.

Specifically, referring to fig. 2, the pressing member 40 is provided with a convex portion 42 and a concave portion 41 along the circumferential direction, the pressing member 40 can rotate relative to the fixing plate 10 to switch between an avoiding state and a pressing state, in the avoiding state, the concave portion 41 corresponds to the screw hole 11 to avoid the adjustable screw 30 or the locking screw 20, that is, at this time, the concave portion 41 coincides with the screw hole 11, the pressing member 40 does not shield the screw hole 11, so that the adjustable screw 30 or the locking screw 20 can smoothly penetrate into the screw hole 11. After the locking screw 20 or the adjustable screw 30 penetrates into the screw hole 11, the fixing plate 10 can be turned into a compression state by rotating the compression member 40, and in the compression state, the convex portion 42 corresponds to the screw hole 11 and shields the screw hole 11 so as to limit the adjustable screw 30 or the locking screw 20 in the screw hole 11, so that the adjustable screw 30 or the locking screw 20 is prevented from withdrawing from the top opening of the screw hole 11, the looseness of the adjustable screw 30 or the locking screw 20 after locking is avoided, and the stability of the anterior cervical fixing device is further improved.

Further, the pressing member 40 is provided with two protrusions 42 and two recesses 41, the two protrusions 42 being circumferentially symmetrically arranged, i.e. the corresponding circumferential angle between the two protrusions 42 is 180 °, and likewise the two recesses 41 being circumferentially symmetrically arranged, i.e. the corresponding circumferential angle between the two protrusions 42 is 180 °. When the pressing member 40 is in the retreated state, the two concave portions 41 enable the pressing member 40 to retreat from the two threaded holes at the same time. When the pressing member 40 is in a pressing state, the two convex portions 42 can simultaneously shield the two threaded holes, so that the two screws can be limited simultaneously. Preferably, the circumferential angle between the protrusion 42 and the recess 41 is 90 °, so that the pressing member 40 can be brought into the pressing state by rotating the pressing member 40 through 90 ° when the pressing member 40 is initially in the retracted state.

With reference to fig. 2, the fixing plate 10 is further provided with perspective windows 12 penetrating through both sides of the fixing plate 10, so that the condition of the cervical vertebrae under the fixing plate 10 can be observed through the perspective windows 12, which is convenient for the doctor to perform the operation or the postoperative examination. Preferably, the see-through window 12 is disposed between two adjacent rows of screw hole sets.

Further, the cross-section of fixed plate 10 on the width direction and all have the radian in the ascending cross-section of length direction to make fixed plate 10 can more laminate cylindrical cervical vertebra, further improve anterior cervical fixing device's implantation steadiness.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

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

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.

Claims (10)

1. The anterior cervical fixing device is characterized by comprising a fixing plate, wherein the fixing plate is provided with screw holes penetrating through two sides of the fixing plate, the hole walls of the screw holes are provided with internal threads, adjustable screws or locking screws can selectively penetrate through the screw holes, each adjustable screw comprises a first screw head and a first stud connected with the first screw head, the first screw head is in rotating fit with the screw holes, and the first screw head can rotate in the screw holes to adjust the implantation angle of the first stud; the locking screw comprises a second screw head and a second stud connected with the second screw head; the second screw head is provided with an external thread matched with the internal thread, and the second screw head is in threaded fit with the screw hole so as to fix the implantation angle of the second stud.

2. The anterior cervical fixation device of claim 1, wherein the first screw head includes a first spherical surface in rotational contact with a wall of the screw hole; the second screw head comprises a second spherical surface, the external thread is arranged on the second spherical surface, and the second spherical surface is in threaded connection with the hole wall of the screw hole.

3. The anterior cervical fixation device of claim 1, wherein the fixation plate has at least two screw holes along the width direction, the at least two screw holes form a row of screw hole sets, and the fixation plate has a plurality of rows of screw hole sets spaced along the length direction.

4. The anterior cervical fixation device of claim 3, wherein a compression member is disposed between two adjacent screw holes in the same row of screw hole sets, and the compression member is used for limiting the adjustable screw or the locking screw in the screw hole.

5. The anterior cervical fixation device of claim 4, wherein the compression member is provided with a protrusion and a recess along a circumferential direction, the compression member is rotatable relative to the fixation plate to switch between an avoidance state and a compression state, and in the avoidance state, the recess corresponds to the screw hole to avoid the adjustable screw or the locking screw; and in the compression state, the convex part corresponds to the screw hole and shields the screw hole so as to limit the adjustable screw or the locking screw in the screw hole.

6. The anterior cervical fixation device of claim 3, wherein all of the screw holes are pierced through the adjustable screw.

7. The anterior cervical fixation device of claim 3, wherein all of the screw holes are pierced through the locking screw.

8. The anterior cervical fixation device of claim 3, wherein a portion of the screw holes in all of the screw holes are pierced by the adjustable screw and another portion of the screw holes are pierced by the locking screw.

9. The anterior cervical fixation device of claim 1, wherein the fixation plate further defines see-through windows extending through both sides of the fixation plate.

10. The anterior cervical fixation device of claim 1, wherein the fixation plate has a curvature in both a width-wise cross-section and a length-wise cross-section.

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