CN115300191A

CN115300191A - Integrated anterior cervical implant

Info

Publication number: CN115300191A
Application number: CN202210940539.XA
Authority: CN
Inventors: 杨晋才; 吴楠; 樊国平; 王雅玲; 李洪艳
Original assignee: Beijing Fule Science & Technology Development Co ltd
Current assignee: Beijing Fule Science & Technology Development Co ltd
Priority date: 2022-08-06
Filing date: 2022-08-06
Publication date: 2022-11-08

Abstract

The application relates to cervical vertebra implant field, especially relates to an integral type anterior cervical vertebra implant, and its technical scheme main points are: the pedicle screw comprises an implant main body and a fixing screw which can be screwed on a pedicle of vertebral arch, wherein the fixing screw is arranged on the implant main body in a penetrating way; the purpose of reducing the protrusion part of the cervical vertebra anterior implant outside the vertebral body so as to reduce the possibility of symptoms such as postoperative nerve irritation and the like is achieved.

Description

Integrated anterior cervical implant

Technical Field

The application relates to the field of cervical vertebra implants, in particular to an integrated anterior cervical vertebra implant.

Background

The middle part of the cervical vertebra is excised and the bone grafting fusion is applied in Bailey-Badgley clinic in the 60 s of the 20 th century, and the cervical vertebra disease mainly comprising the comminuted fracture of the cervical vertebra is treated, so that the cervical vertebra is fixed after the bone grafting to prevent the cervical vertebra from deforming.

An anterior cervical implant system described in the related art includes a cylindrical titanium mesh for implantation between vertebral bodies and a steel plate disposed at one side of the titanium mesh; the vertebral body secondary total excision surgery comprises the following steps: 1. making an incision on the front side of the neck of a human body to expose the vertebral body and the front path of the intervertebral disc; 2. using an opening forceps to open the vertebral body and remove the intervertebral disc; 3. cutting off a pathological change part of the vertebral body by using an ultrasonic osteotome; 4. implanting the titanium mesh filled with the broken bones into the excised position of the vertebral body; 5. fixing a steel plate on the front sides of the vertebral bodies at the upper side and the lower side of the pathological vertebral body through screws so as to prevent the titanium mesh from being separated from the intervertebral space; 6. the surgical incision is sutured.

In view of the above-mentioned related art solutions, the inventors found that: this kind of anterior cervical spine implants system can't accomplish zero notch, because the steel sheet is fixed in the centrum front side promptly, consequently the steel sheet must have a large amount of bulge parts in the centrum outside, and then easily causes postoperative symptoms such as nerve irritation.

Disclosure of Invention

In order to reduce the protrusion part of the anterior cervical implant existing outside the vertebral body and reduce the possibility of symptoms such as postoperative nerve irritation, the application provides an integrated anterior cervical implant.

The application provides an integral type anterior cervical spine implant adopts following technical scheme:

an integrated anterior cervical implant comprises an implant body and a fixing screw which can be screwed on a vertebral pedicle, wherein the fixing screw is arranged on the implant body in a penetrating mode.

Through adopting above-mentioned technical scheme, implant main part implants the back in the groove, penetrate the implant main part with set screw, and make set screw twist the pedicle of vertebral arch, the both ends of implant main part are laminated respectively on the terminal surface with two centrums that pathological change centrum is adjacent, and make the surface of implant main part and the laminating of the front side surface of centrum, and then realize the replacement of implant main part to centrum pathological change position, there is not protruding position in the centrum outside the postoperative, and greatly reduced the possibility that symptoms such as postoperative nerve arouses produced.

Optionally, the implant body is provided with a bone cement chamber, two sides of the implant are wound-fitted sides capable of being fitted to two wound planes of the vertebral body respectively, and at least one wound-fitted side is provided with an overflow hole communicated with the bone cement chamber.

Through adopting above-mentioned technical scheme, pack into the bone cement cavity with bone cement, bone cement can overflow into between wound plane and the wound laminating side through the overflow hole, and then promotes the integration of postoperative implant main part and centrum.

Optionally, the wound-engaging side is recessed to form a wound-engaging plane that engages the wound plane of the vertebral body.

Through adopting above-mentioned technical scheme, compare in columniform titanium net, the laminating area between wound laminating plane has increased implant main part and the wound plane has been cooperated the bone mud that overflows between wound laminating plane and the wound plane, has improved the postoperative of implant main part and has fused effect and stability greatly.

Optionally, the two ends of the implant body have vertebral body attachment surfaces capable of attaching to the end surfaces of the vertebral body, and protrusions for increasing friction between the implant body and the end surfaces of the vertebral body are arranged on the vertebral body attachment surfaces.

By adopting the technical scheme, the friction force between the cone binding surface and the end surface of the cone is increased, and the postoperative stability of the implant body relative to the cone is improved.

Optionally, the implant body includes an intermediate portion and at least one intervertebral portion that is located intermediate portion one end, and a plurality of screens holes have been seted up on the intermediate portion one end global that is close to intervertebral portion, and a plurality of screens holes are fixed with the screens piece that can insert the inside screens hole along the length direction interval distribution of intermediate portion on the intervertebral portion.

The intervertebral height between different patients has the difference, and even the different intervertebral heights of same patient are also not unified, through adopting above-mentioned technical scheme, the total length that convenient intervertebral height adjustment intervertebral part and intermediate part formed according to reality, and then play the effect according to intervertebral height adjustment implant main part whole length.

Optionally, one side of the implant main body is provided with a closing door, the closing door is positioned on one side facing away from the tip of the fixing screw, a door slot communicated with the bone cement chamber is formed in the implant main body, and the closing door is embedded into the door slot.

By adopting the technical scheme, when the bone cement needs to be filled, the closing door is opened so that the bone cement can be rapidly filled into the bone cement chamber; after filling, a closure door is mounted to the implant body to prevent bone cement from escaping from the side adjacent the anterior longitudinal ligament.

Optionally, the implant body is provided with a head caulking groove for embedding the head of the fixing screw, and the closing door completely covers the head caulking groove.

Through adopting above-mentioned technical scheme for the position department of head caulking groove is more level and smooth, and shelters from fixing screw's head, prevents that the implant main part from sliding to the one side of keeping away from anterior longitudinal ligament.

Optionally, the two sides of the closing door are formed with buckles, and the two sides of the implant body are provided with clamping grooves for the buckles to be embedded into so as to block the closing door from being separated from the implant body.

Optionally, the closing door is provided with a threaded holding hole.

Through adopting above-mentioned technical scheme, be convenient for hold get the closing door in order to install the closing door on the implant main part, it can to hold the pole of getting to twist in the reverse direction after the implantation so that hold the pole of getting and screw out.

Optionally, the side surface of the implant body and the surface of the side of the closing door, which is away from the bone cement chamber, form a front bionic arc surface together.

By adopting the technical scheme, the protruding part outside the cone after the whole implant operation is completely eliminated.

In summary, the present application has the following technical effects:

1. the implant main body and the fixing screws are arranged, so that the implant main body can replace the pathological change part of the vertebral body, no protruding part exists outside the vertebral body after operation, and the possibility of generating symptoms such as postoperative nerve irritation is greatly reduced;

2. compared with a cylindrical titanium mesh, the wound fitting plane increases the fitting area between the implant main body and the wound plane, and the bone cement overflowing into the space between the wound fitting plane and the wound plane is matched, so that the postoperative fusion effect and stability of the implant main body are greatly improved;

3. by arranging the closing door, when the bone cement needs to be filled, the closing door is opened so that the bone cement can be rapidly filled into the bone cement chamber; the head of the fixing screw is shielded, so that the position of the head embedded groove is smoother, and the protruding part outside the cone after the whole implant operation is completely eliminated.

Drawings

FIG. 1 is a vertebral body after an ultrasonic osteotome has removed a lesion;

FIG. 2 is a perspective view of an integrated anterior cervical implant in an embodiment of the present application;

FIG. 3 is a perspective view of an implant body in an embodiment of the present application;

FIG. 4 is a schematic structural view of the integrated anterior cervical implant of the present embodiment after implantation in the cervical spine;

fig. 5 is an exploded view of the integrated anterior cervical implant in an embodiment of the present application.

In the drawings, 1, an implant body; 101. an intermediate portion; 1011. a position clamping hole; 102. the intervertebral space; 1021. a clamping piece; 2. a set screw; 3. a bone cement chamber; 4. a wound-engaging side; 5. an overflow aperture; 6. a wound-engaging plane; 7. a vertebral body binding surface; 9. a protrusion; 10. closing the door; 11. a door slot; 12. a head caulking groove; 13. a rod part through hole; 14. buckling; 15. a card slot; 16. a screw thread holding hole; 17. a front bionic cambered surface; 18. an intervertebral fusion part; 19. a vertebral body; 20. implanting into a groove; 21. a wound plane; 22. and (4) the intervertebral space.

Detailed Description

In the description of the present application, it is to be noted that the terms "upper", "lower", "inside", "outside", and the like are relative relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the process or module referred to must have a specific orientation, state, and operation, and thus, should not be construed as limiting the present invention.

The present application is described in further detail below with reference to the attached drawings.

Referring to fig. 1, the end of the cervical vertebra close to the head is defined as the upper end, the end close to the hip is defined as the lower end, and after the intervertebral disc is removed, a gap is formed between the upper and lower intervertebral discs 22 of the pathological vertebral body 19; after a portion of the vertebral body 19 is removed by using the ultrasonic osteotome, an implant slot 20 for an implant to be inserted is formed on the affected vertebral body 19, the implant slot 20 is communicated with the upper and lower intervertebral discs 22, and two slot walls of the implant slot 20 are wound planes 21.

Referring to fig. 2, the present application provides a one-piece anterior cervical implant including an implant body 1 and two set screws 2 penetrating into the interior of the implant body 1; the two ends of the implant main body 1 are respectively provided with a vertebral body binding surface 7 which is bound with the end surfaces of an upper vertebral body 19 and a lower vertebral body 19, after the implant main body 1 is implanted into the implantation groove 20, the two sides of the implant main body 1 which are respectively bound with the two wound planes 21 are wound binding sides 4, and the fixing screw 2 is screwed into the vertebral pedicle after the implant main body 1 is implanted into the vertebral body 19, so that the fixation between the implant main body 1 and the pathological change vertebral body 19 is realized.

Compared with the anterior cervical implantation system recorded in the related art, the implant body 1 of the application is embedded into the implantation groove 20 without a steel plate exposed outside the front side of the vertebral body 19, so that the protruding part of the anterior cervical implant outside the vertebral body 19 is greatly reduced, and the possibility of symptoms such as postoperative nerve irritation is reduced; in addition, in order to eliminate the protruding part, the front side of the implant body 1 is provided with a front side bionic arc surface 17 formed by profiling according to the surface shape of the patient vertebral body 19, so that zero incisura is really realized to further optimize the postoperative recovery effect.

Specifically, referring to fig. 2 and 3, the implant body 1 is provided with two rod through holes 13 through which the fixing screws 2 coaxially penetrate, the two rod through holes 13 extend from the front side of the implant body 1 to the two wound fitting sides 4 respectively and penetrate through the implant body 1, and the front side surface of the implant body 1 is provided with two head caulking grooves 12 respectively communicated with the corresponding rod through holes 13; when it is desired to insert the fixing screw 2 into the implant body 1 and to screw it on the pedicle of vertebral arch, the shaft of the fixing screw 2 is inserted into the shaft through-hole 13, and the fixing screw 2 is screwed so that the fixing screw 2 is advanced toward the inside of the pedicle of vertebral arch until the head of the fixing screw 2 is completely inserted into the head caulking groove 12.

Referring to fig. 2 and 3, in order to facilitate the fusion of the implant body 1 with the wound plane 21 after operation, a bone cement chamber 3 for filling bone cement therein is formed on the implant body 1, a plurality of overflow holes 5 for the bone cement in the bone cement chamber 3 to overflow the implant body 1 are formed on the implant body 1, and the overflow holes 5 are distributed on both the wound fitting sides 4; the bone cement can overflow to the space between the wound joint side 4 and the wound plane 21 through the overflow hole 5, and then the effect of promoting the postoperative fusion is achieved.

Moreover, two wound fitting planes 6 are concavely formed on the implant body 1, the two wound fitting planes 6 are respectively positioned on the two wound fitting sides 4, and an overflow hole 5 is formed in each wound fitting plane 6; since the ultrasonic osteotome can only cut a plane, the wound fitting plane 6 fits the corresponding wound plane 21 while the implant body 1 is implanted in the implantation groove 20, which increases the fitting area between the implant body 1 and the wound plane 21 compared to the curved surface of the cylindrical titanium mesh, further promoting the postoperative fusion of the implant body 1.

Referring to fig. 4, in addition, after the intervertebral disc is removed, the intervertebral 22 is in a hollow state, the concave wound fitting plane 6 enables the upper end and the lower end of the implant body 1 to form an intervertebral fusion part 18 which can be implanted into the intervertebral 22, and the vertebral body fitting surface 7 is located on the end surface of the intervertebral fusion part 18, so that it can be understood that the width of the intervertebral fusion part 18 is greater than the distance between the two wound planes 21, thereby increasing the supporting area of the intervertebral 22 and improving the postoperative stability of the implant body 1; the arrangement of the two vertebral body abutting surfaces 7 can also be used for stably holding the implant body 1 by the fusion cage holder.

Referring to fig. 3, the intervertebral heights of different patients are different, even the intervertebral heights of the same patient are not uniform, so that the overall height of the implant body 1 needs to be adjusted according to the different intervertebral heights to improve the fusion effect of the implant body 1; for this purpose, the implant body 1 comprises a middle part 101 which can be placed in the implantation groove 20 and two intervertebral parts 102 which are respectively positioned at two ends of the middle part 101, an attaching plane 6 is formed on the middle part 101, a vertebral body attaching surface 7 is formed on the end surface of the intervertebral part 102, and the intervertebral part 102 is the intervertebral fusion part 18; a plurality of clamping holes 1011 communicated with the bone cement cavity 3 are formed in the middle part 101, the clamping holes 1011 are respectively located on the corresponding surfaces of the middle part 101, and the clamping holes 1011 in each group are distributed at equal intervals along the length direction of the middle part 101; correspondingly, the intervertebral part 102 is hollow and is sleeved on the end of the middle part 101, a plurality of locking members 1021 corresponding to each group of locking holes 1011 are formed on the inner wall of the intervertebral part 102, and the locking members 1021 are rectangular in shape in this embodiment.

When the intervertebral part 102 and the middle part 101 are assembled, the locking member 1021 is inserted into the corresponding locking hole 1011, and in the process, the intervertebral part 102 is slightly elastically deformed to enable the locking member 1021 to enter the locking hole 1011, so that the fixation between the intervertebral part 102 and the middle part 101 is realized, and the locking hole 1011 can be properly selected according to the required height of the implant body 1 for inserting the locking member 1021.

Referring to fig. 2, a plurality of protrusions 9 for increasing the friction coefficient of the vertebral body attachment surface 7 are formed on the vertebral body attachment surface 7, the protrusions 9 may be a plurality of dot-shaped protrusions 9 arranged in a rectangular array or linear protrusions 9 parallel to each other, in this embodiment, the protrusions 9 are saw-tooth-shaped protrusions 9, and the post-operation stability of the implant body 1 is further improved.

Referring to fig. 5, in order to facilitate the filling of bone cement, a door slot 11 communicated with the bone cement chamber 3 is formed in the front side of the implant body 1, a closing door 10 for closing the front side of the bone cement chamber 3 is embedded in the door slot 11, and a screw thread holding hole 16 for holding and taking the closing door 10 by a screw thread holding rod is formed in the closing door 10; buckles 14 are formed on two sides of the closed door 10, and a clamping groove 15 for the buckles 14 to be embedded and clamped is formed in the wound fitting plane 6; after the bone cement is filled, the closing door 10 is held by the screw holding rod so that the closing door 10 is inserted into the door groove 11, and the buckle 14 is clamped into the clamping groove 15 so that the closing door 10 is fixed on the implant body 1.

In addition, the side of the closing door 10 departing from the bone cement chamber 3 is also formed by profiling according to the surface shape of the patient vertebral body 19, after the closing door 10 is installed on the implant body 1, the front side surface of the implant body 1 and the surface of the closing door 10 departing from the bone cement chamber 3 form a front side bionic arc surface 17 together.

The gate slot 11 covers head caulking groove 12 completely and offers, and then after the closing door 10 embedding gate slot 11, the closing door 10 can be closed the head of set screw 2 in head caulking groove 12 completely for the position department of head caulking groove 12 is more level and smooth, and shelters from the head of set screw 2, prevents that implant main part 1 from sliding to the one side of keeping away from the anterior longitudinal ligament.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. An integrated anterior cervical implant, comprising: the pedicle screw comprises an implant main body (1) and a fixing screw (2) which can be screwed on a pedicle, wherein the fixing screw (2) penetrates through the implant main body (1).

2. The integrated anterior cervical implant according to claim 1, wherein: the bone cement chamber (3) is arranged on the implant main body (1), two sides of the implant are wound attaching sides (4) which can be respectively attached to two wound planes (21) of a vertebral body (19), and at least one wound attaching side (4) is provided with an overflow hole (5) communicated with the bone cement chamber (3).

3. The integrated anterior cervical implant according to claim 2, wherein: the wound application side (4) is recessed inwardly to form a wound application plane (6) that can be applied to a wound plane (21) of a vertebral body (19).

4. The integrated anterior cervical implant according to claim 3, wherein: the two ends of the implant body (1) are provided with cone attaching surfaces (7) which can be attached to the end surfaces of the cones (19), and the cone attaching surfaces (7) are provided with bulges (9) used for increasing the friction force between the implant body (1) and the end surfaces of the cones (19).

5. The integrated anterior cervical implant according to claim 1, wherein: the implant body comprises an intermediate part (101) and at least one intervertebral part (102) located at one end of the intermediate part (101), a plurality of clamping holes (1011) are formed in the peripheral surface of one end, close to the intervertebral part (102), of the intermediate part (101), the clamping holes (1011) are distributed at intervals along the length direction of the intermediate part (101), and clamping pieces (1021) capable of being inserted into the clamping holes (1011) are fixed on the intervertebral part (102).

6. The integrated anterior cervical implant according to claim 2, wherein: one side of implant main part (1) is provided with closed door (10), and closed door (10) are located the one side that deviates from the most advanced orientation of set screw (2), offer gate slot (11) that are linked together with bone mud cavity (3) on implant main part (1), and closed door (10) imbed in gate slot (11).

7. The integrated anterior cervical implant of claim 6, wherein: the implant main body (1) is provided with a head caulking groove (12) for the head of the fixing screw (2) to be embedded in, and the closing door (10) completely covers the head caulking groove (12).

8. The integrated anterior cervical implant according to claim 6, wherein: buckles (14) are formed on two sides of the closing door (10), and clamping grooves (15) which can be used for being embedded by the buckles (14) to block the closing door (10) from being separated from the implant body (1) are formed on two sides of the implant body (1).

9. The integrated anterior cervical implant of claim 6, wherein: the closed door (10) is provided with a threaded holding hole (16).

10. The integrated anterior cervical implant according to claim 6, wherein: the side surface of the implant main body (1) and the surface of one side of the closing door (10) departing from the bone cement chamber (3) jointly form a front bionic arc surface (17).