CN112716662A

CN112716662A - Intervertebral fusion device

Info

Publication number: CN112716662A
Application number: CN202110101981.9A
Authority: CN
Inventors: 朱腾月
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-01-26
Filing date: 2021-01-26
Publication date: 2021-04-30

Abstract

The application provides an interbody fusion cage, which comprises a cage body and a spiral jackscrew; the fusion cage body comprises a base part and a strutting part; along the length direction of the fusion cage body, one end of the basic part and one end of the strutting part are integrally formed or fixedly connected; the other end of the base part is provided with a screwing hole; a cavity is arranged inside the strutting part along the central axis of the length direction of the strutting part, and the screwing hole is communicated with the cavity; bone grafting windows are correspondingly arranged on the upper end surface and the lower end surface of the fusion cage body along the height direction of the fusion cage body and are communicated with the cavity; the side wall of the opening part is provided with an opening groove, and the opening groove divides the opening part into an upper opening part and a lower opening part from the opposite end of the connecting end of the opening part and the base part; the spiral jackscrew is from rotating the hand-hole and getting into in the cavity, and the one end of spiral jackscrew is connected in rotating the hand-hole, and the other end is used for strutting the portion of strutting. The size of the fusion cage can be changed, and the situations of slippage of the fusion cage, instability of the spine and the like are avoided.

Description

Intervertebral fusion device

Technical Field

The application belongs to the technical field of medical instruments, and particularly relates to an interbody fusion cage.

Background

Intervertebral discs are located between adjacent vertebral bodies in the spine. The intervertebral discs can help stabilize the spine and help distribute forces between vertebral bodies. The intervertebral disc comprises an outer annulus fibrosis surrounding an inner nucleus pulposus. The nucleus pulposus comprises a gelatinous material that can absorb the stresses acting on the intervertebral disc. The annulus fibrosus is a concentric layered structure of collagen fibers and fibrocartilage capable of resisting torsional and bending forces. Intervertebral discs are susceptible to displacement or damage caused by trauma, disease, or other degenerative processes with age.

Currently, intervertebral fusion is an effective method for treating degenerative diseases of the spine. When performing spinal fusion, a surgeon typically first resects the disc at the site of the lesion and then inserts a cage filled with a filler material, such as bone, tissue, cells, medication, etc., into the disc space to replace the resected disc. The filler in the cage helps bone to grow into the cage from both sides of the cage, and finally the fixation of the cage is achieved. However, the inventor of the present application finds in the research and development process that problems such as slipping of the fusion cage, instability of the spine, low fusion rate, etc. are easily caused by the fact that the intervertebral fusion cage with a fixed size is clinically used.

Disclosure of Invention

To overcome, at least in part, the problems of the related art, the present application provides a variable volume intervertebral cage.

According to an embodiment of the present application, there is provided an intervertebral cage comprising a cage body and a helical jackscrew; the fusion cage body comprises a base part and a strutting part; along the length direction of the fusion cage body, one end of the basic part and one end of the strutting part are integrally formed or fixedly connected together; the other end of the base part is provided with a screwing hole;

a cavity is arranged inside the strutting part along the central axis of the length direction of the strutting part, and the screwing hole is communicated with the cavity;

bone grafting windows are correspondingly arranged on the upper end surface and the lower end surface of the fusion cage body along the height direction of the fusion cage body, and the bone grafting windows are communicated with the cavity;

the side wall of the opening part is provided with an opening groove, and the opening groove divides the opening part into an upper opening part and a lower opening part from one end of the opening part far away from the base part to the direction close to the base part;

one end of the spiral jackscrew enters the fusion cage body from the end, far away from the opening part, of the base part so as to open the opening part, and the other end of the spiral jackscrew is connected with the base part.

In the above intervertebral fusion device, the spiral jackscrew includes a cylindrical portion and a conical portion, and one end of the cylindrical portion and the opposite end of the tip of the conical portion are integrally formed or fixedly connected together; and an external thread is arranged on the side wall of the other end of the column part, an internal thread is arranged in the screwing hole, and the external thread is matched with the internal thread.

Furthermore, a connecting hole is formed from the end part of the opposite end of the connecting end of the cylindrical part and the conical part to the inside of the cylindrical part along the length direction of the cylindrical part, and the connecting hole is used for matching with the tool end of the distractor in the implantation device.

Furthermore, a limiting part is arranged on the outer wall close to the connecting end of the cylindrical part and the conical part, and the upper opening part and the lower opening part limit the limiting part to prevent the spiral jackscrew from being screwed out of the fusion device body.

In the intervertebral fusion cage, the front end surface and the rear end surface of the width direction of the base part are provided with clamping grooves, and the clamping grooves are used for matching with the tool end of a holder in an implantation device.

In the intervertebral fusion cage, the upper surface and the lower surface of the body of the fusion cage in the height direction are both provided with inverted teeth.

In the intervertebral fusion cage, the fusion cage body and the spiral jackscrew are both made of medical titanium alloy Ti-6A1-4V, Ti-24Nb-4Zr-8Sn or PEEK material, and the surfaces of the fusion cage body and the spiral jackscrew are coated with hydroxyapatite coatings.

In the above intervertebral cage, the inclination between the rear side and the front side of the cage body is set to one of 0 °, 5 °, 8 °, and 12 ° in the width direction of the cage body.

In the intervertebral fusion cage, along the width direction of the fusion cage body, the thickness of one side of the fusion cage body is larger than that of the other side, or the height of the opening groove of one side support of the fusion cage body is larger than that of the opening groove of the other side support of the fusion cage body.

In the above intervertebral fusion cage, the cross section of the cage body in the height direction thereof is one of an arc surface, an elliptical surface and a rectangular surface.

According to the above embodiments of the present application, at least the following advantages are obtained: the interbody fusion cage is provided with the fusion cage body and the spiral jackscrew, the fusion cage body comprises a base part and a strutting part, a cavity is arranged in the fusion cage body, bone grafting windows are correspondingly arranged on the upper end surface and the lower end surface of the fusion cage body along the height direction of the fusion cage body, and the bone grafting windows are communicated with the cavity; the opposite end of the connecting end of the base part and the strutting part is provided with a screwing hole which is communicated with the cavity; the side wall of the opening part is provided with an opening groove which divides the opening part into an upper opening part and a lower opening part; when the spiral jackscrew enters the cavity from the spin-in hole, one end of the spiral jackscrew is connected into the spin-in hole, and the other end of the spiral jackscrew is used for opening the opening part; the fusion cage body is propped open through the spiral jacking wire, so that the size of the fusion cage can be changed to adapt to the requirements of different patients, and the situations of slippage, unstable spine and the like of the fusion cage are avoided; this application is again through filling fillers such as skeleton, tissue, cell, medicament in the cavity, and skeleton and filler are through planting bone window interactive growth, can realize intervertebral fusion better, improve and fuse the rate.

Set up the pawl on the upper surface and the lower surface of the fusion cage body among this application interbody fusion cage, can make this application interbody fusion cage closely the card jail centrum after implanting human intervertebral space and struts, avoid interbody fusion cage to retreat and cause the injury to patient's health.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the scope of the invention, as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification of the application, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.

Fig. 1 is a top view of an intervertebral cage according to an embodiment of the present disclosure.

Fig. 2 is a schematic overall structural diagram of a cage body in an intervertebral cage according to an embodiment of the present disclosure.

Fig. 3 is a right side view of a cage body in an intervertebral cage according to an embodiment of the present disclosure.

Fig. 4 is a schematic structural diagram of a spiral jackscrew in an intervertebral cage according to an embodiment of the present application.

Fig. 5 is a schematic view illustrating an operation state of an intervertebral cage and an implanting device thereof according to an embodiment of the present application.

Fig. 6 is a schematic structural view of a holder in an implanting device of an intervertebral fusion cage according to an embodiment of the present disclosure.

Fig. 7 is a schematic structural view of a fixator in an implantation device of an intervertebral fusion cage according to an embodiment of the present application.

Fig. 8 is a schematic structural view of a spreader in an intervertebral cage implant device according to an embodiment of the present disclosure.

Description of reference numerals:

1. a fusion cage body;

11. a base portion; 111. screwing into the hole; 112. a clamping groove;

12. a distraction section; 121. a cavity; 122. opening a groove; 123. an upper spreader portion; 124. a lower distraction section;

13. a bone grafting window;

14. chamfering;

2. screwing a jackscrew;

21. a cylindrical portion; 211. an external thread;

22. a cone portion;

23. a limiting part;

3. a holder; 31. a first pipe body; 32. a handle; 33. a clamping block;

4. a holder; 41. a second tube body; 42. a baffle ring;

5. a distractor; 51. a rod body; 52. a handle.

Detailed Description

For the purpose of promoting a clear understanding of the objects, aspects and advantages of the embodiments of the present application, reference will now be made to the accompanying drawings and detailed description, wherein like reference numerals refer to like elements throughout.

The illustrative embodiments and descriptions of the present application are provided to explain the present application and not to limit the present application. Additionally, the same or similar numbered elements/components used in the drawings and the embodiments are used to represent the same or similar parts.

As used herein, the terms "first," second, "" etc. do not denote any order or sequential or any other order, nor are they used to limit the application, but rather are used to distinguish one element from another element or operation described in such technical language.

With respect to directional terminology used herein, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology used is intended to be illustrative and is not intended to be limiting of the present teachings.

As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.

As used herein, "and/or" includes any and all combinations of the described items.

References to "plurality" herein include "two" and "more than two"; reference to "multiple sets" herein includes "two sets" and "more than two sets".

As used herein, the terms "substantially", "about" and the like are used to modify any slight variation in quantity or error that does not alter the nature of the variation. In general, the range of slight variations or errors that such terms modify may be 20% in some embodiments, 10% in some embodiments, 5% in some embodiments, or other values. It should be understood by those skilled in the art that the aforementioned values can be adjusted according to actual needs, and are not limited thereto.

Certain words used to describe the present application are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present application.

As shown in fig. 1, the present application provides an intervertebral cage comprising a cage body 1 and a helical jackscrew 2.

As shown in fig. 2 and 3, the cage body 1 includes a base portion 11 and an expanding portion 12. One end of the base part 11 and one end of the expanding part 12 are integrally formed or fixedly connected together along the length direction of the fusion cage body 1. The other end of the base part is provided with a screwing hole 111, and an internal thread is arranged in the screwing hole 111. The spiral jackscrew 2 enters the fusion device body 1 from the screw-in hole 111, and the screw-in hole 111 is also matched with the fixer 4 in the implantation device.

A cavity 121 is provided inside the distracting part 12 along the central axis of the distracting part 12 in the longitudinal direction. The screw hole 111 communicates with a cavity 121 inside the spreading part 12.

Along the direction of height of the fusion cage body 1, bone grafting windows 13 are correspondingly arranged on the upper end surface and the lower end surface of the fusion cage body 1, and the bone grafting windows 13 are communicated with the cavity 121 inside the fusion cage body 1. The bone grafting window 13 may be a rounded rectangle, a rectangle, an ellipse, a circle, or the like.

The side wall of the opening portion 12 is opened with an opening slot 122, and the opening slot 122 divides the opening portion 12 into an upper opening portion 123 and a lower opening portion 124. When the distracting part 12 is distracted, the fusion cage body 1 has a structure in which one end is thick and the other end is thin. When in clinical use, the spiral jackscrew 2 can be used for strutting the strutting part 12 by a required angle according to the requirements of different patients.

As shown in fig. 4, the spiral jackscrew 2 comprises a cylindrical portion 21 and a conical portion 22, wherein one end of the cylindrical portion 21 is integrally formed or fixedly connected with the opposite end of the tip of the conical portion 22; the side wall of the other end of the cylindrical portion 21 is provided with an external thread 211, and the external thread 211 is matched with an internal thread provided in the screw hole 111 so that the screw jack 2 can enter the cavity 121 of the fusion cage body 1.

A connection hole is opened from an end of an opposite end of a connection end of the cylindrical portion 21 and the tapered portion 22 toward the inside of the cylindrical portion 21 along the length direction of the cylindrical portion 21. The connecting hole is matched with the tool end of the spreader 5 in the implantation device, so that the implantation device drives the spiral jackscrew 2 to move towards the spreading part 12 of the fusion cage body 1, and further the spreading part 12 is spread. Specifically, the connection holes may be a straight hole, a cross hole, a triangular hole, a quadrangular hole, a pentagonal hole, a hexagonal hole, and the like, and correspondingly, the tool end of the distractor 5 is a straight end, a cross end, a triangular end, a quadrangular end, a pentagonal end, a hexagonal end, and the like.

In order to limit the travel of the spiral jackscrew 2 in the process of expanding the expansion part 12 in the fusion cage body 1, a limiting part 23 is arranged on the outer wall close to the connecting end of the cylindrical part 21 and the conical part 22. Specifically, the limiting portion 23 may be a cylindrical structure, and the cylindrical structure is wound on the outer wall of the column portion 21; the stopper portion 23 may be formed of rectangular parallelepiped blocks, and a pair of rectangular parallelepiped blocks is provided on the upper end surface and the lower end surface of the outer wall of the column portion 21 in the height direction of the spreading portion 12. That is, in the process of expanding the expansion portion 12 of the fusion cage body 1, the screw 2 is restrained by the upper expansion portion 123 and the lower expansion portion 124 of the expansion portion 12, and the screw 2 is prevented from being unscrewed from the fusion cage body 1.

In the above embodiment, as shown in fig. 2 and fig. 3, the front end face and the rear end face in the width direction of the base portion 11 are provided with the engaging grooves 112, and the engaging grooves 112 are matched with the tool end of the holder 3 in the implanting device, so that the holder 3 holds the fusion device body 1.

In the above embodiment, as shown in fig. 2, in order to tightly clamp the vertebral body after the intervertebral cage is implanted into the vertebral body space to avoid the intervertebral cage from retreating, the upper surface and the lower surface of the cage body 1 in the height direction are provided with the inverted teeth 14. When the fusion cage body 1 has an arc-shaped structure, the inverted teeth 14 may have edges with the same arc as the fusion cage body 1.

In the above embodiment, the fusion cage body 1 may have a structure in which the cross section in the height direction is an arc surface, or may have a structure in which the cross section in the height direction is an elliptical surface or a rectangular surface.

In a specific embodiment, the fusion cage body 1 and the spiral jackscrew 2 can be made of medical titanium alloy Ti-6A1-4V, Ti-24Nb-4Zr-8Sn or PEEK (polyetheretherketone) materials, and the surfaces of the fusion cage body and the spiral jackscrew are coated with hydroxyapatite coatings. The fusion cage body 1 and the spiral jackscrew can be both made by adopting a 3D printing technology and can also be made by adopting an injection molding technology.

In a specific embodiment, along the width direction of the fusion cage body 1, when the intervertebral fusion cage is placed between vertebral bodies, the side of the fusion cage body 1 away from the spinous process is the rear side, and the side of the fusion cage body 1 close to the spinous process is the front side, so that the inclination between the rear side and the front side of the fusion cage body 1 can be set to be 0 °, 5 °, 8 °, 12 ° so as to adapt to the gap between two adjacent vertebral bodies in different human bodies, so that the intervertebral fusion cage can be attached to the vertebral bodies, and the fusion is more facilitated.

In addition, the thickness of the rear side of the fusion cage body 1 can be set to be larger than that of the front side, or the height of the supporting groove of the rear side of the fusion cage body 1 is larger than that of the supporting groove of the front side of the fusion cage body 1.

As shown in fig. 5, the present application also provides an implantation tool for use with an intervertebral cage, which includes a holder 3, a fixator 4, and a distractor 5. When the fusion cage is used, one end of the holder 3 is inserted into the clamping groove 112 on the base part 11, one end of the fixer 4 is inserted from the other end of the holder 3 and then screwed into the screwing hole 111, the other end of the fixer 4 is positioned outside the other end of the holder 3, and the holder 3 and the fixer 4 jointly act to fix the fusion cage body 1. One end of the spreader 5 is inserted into the connecting hole of the spiral jackscrew 2 from the other end of the fixer 4, and one end of the spreader 5 is positioned outside the other end of the fixer 4.

The spreader 5 drives the spiral jackscrew 2 to move towards the spreading part 12 of the fusion cage body 1, the upper spreading part 123 and the lower spreading part 124 of the fusion cage body 1 are spread by a preset angle under the expansion of the spiral jackscrew 2, and the volume of the fusion cage body 1 expands.

In one embodiment, as shown in fig. 6, the holder 3 comprises a first tube 31, and a handle 32 is connected to a sidewall of the first tube 31 to facilitate holding the holder 3. The fixture block 33 is disposed at the tool end of the first tube 31, and the fixture block 33 matches with the fixture groove 112, so as to facilitate the clamping of the holder 3 with the fusion cage body 1. Specifically, the two clamping blocks 33 are arranged at the tool end of the first tube 31, one clamping block 33 is clamped with the clamping groove 112 at the front end surface of the base portion 11 in the width direction, and the other clamping block 33 is clamped with the clamping groove 112 at the rear end surface of the base portion 11 in the width direction.

In one embodiment, as shown in FIG. 7, the holder 4 comprises a second tube 41, wherein the side wall of the tool end of the second tube 41 is provided with an external thread 211, and the opposite end of the tool end of the second tube 41 is provided with a stop ring 42. Wherein the diameter of the retainer ring 42 is larger than the diameter of the opposite end of the tool end of the first tube 31. The stop ring 42 is provided to facilitate gripping of the holder 4, on the one hand, and to screw the tool end of the second body 41 into the screwing hole 111; on the other hand, the second tube 41 can be prevented from entering the first tube 31.

Specifically, the baffle ring 42 may have a cylindrical structure with a predetermined length and wall thickness. To increase gripping friction, the outer wall of the retainer ring 42 is provided with striations or other types of patterns.

In one embodiment, as shown in fig. 8, the distractor 5 comprises a shaft 51 and a handle 52, the shaft 51 and the handle 52 forming a T-shaped structure. Wherein, the tool end of the rod body 51 is matched with the connecting hole, and the opposite end of the tool end of the rod body 51 is fixedly connected with the handle 52 or integrally formed. The spreader 5 is used for driving the spiral jackscrew 2 to move from the base part 11 of the fusion cage body 1 to the spreading part 12 direction so as to spread the spreading part 12 of the fusion cage body 1.

In the above embodiments, as shown in fig. 5 to 8, the diameter of the first tube 31 is larger than that of the second tube 41, and the diameter of the second tube 41 is larger than that of the rod 51.

When this application implantation tool cooperation interbody fusion cage uses, peg graft earlier on the fusion cage body 1 holder 3, utilize fixer 4 to fix holder 3 on fusion cage body 1. The tool end of the spreader 5 penetrates through the fixer 4 and then is inserted into the connecting hole of the spiral jackscrew 2, the handle 52 of the spreader 5 is screwed, the spreader 5 drives the spiral jackscrew 2 to move from the base part 11 of the fusion cage body 1 to the spreading part 12, and the spiral jackscrew 2 spreads the spreading part 12, so that the volume of the interbody fusion cage is expanded. After the intervertebral cage is expanded to the required height, the spreader 5 is drawn out. The intervertebral cage is fixed between two adjacent vertebral bodies by the inverted teeth 14 on the upper and lower surfaces, and the holder 3 is removed from the intervertebral cage by screwing the anchor 4 in the opposite direction.

This application changeable interbody fusion cage of volume can be arranged in the minimal access surgery, implants the bone to the cavity 121 in the fusion cage body 1 through planting bone window 13, can improve and fuse the rate, makes patient's postoperative resume soon, can prevent that treatments such as relapse, lumbar vertebrae degeneration are unstable the condition emergence.

The foregoing is merely an illustrative embodiment of the present application, and any equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present application shall fall within the protection scope of the present application.

Claims

1. An intervertebral fusion cage is characterized by comprising a fusion cage body and a spiral jackscrew; the fusion cage body comprises a base part and a strutting part; along the length direction of the fusion cage body, one end of the basic part and one end of the strutting part are integrally formed or fixedly connected together; the other end of the base part is provided with a screwing hole;

2. An intersomatic cage according to claim 1, wherein the helical jackscrew comprises a cylindrical portion and a conical portion, one end of the cylindrical portion being integrally formed with or fixedly connected to an opposite end of the conical portion tip; and an external thread is arranged on the side wall of the other end of the column part, an internal thread is arranged in the screwing hole, and the external thread is matched with the internal thread.

3. An intersomatic cage according to claim 2, characterized in that, along the length of the cylindrical portion, from the end of the end opposite the end where the cylindrical portion connects to the conical portion, towards the inside of the cylindrical portion, there is a connection hole for the tool end of a spreader in an implant device.

4. An intersomatic cage according to claim 2, wherein a stop portion is provided on the outer wall near the end where the cylindrical and conical portions are connected, and the upper and lower distracting portions stop the stop portion and prevent the screw driver from being unscrewed from the cage body.

5. An intersomatic cage according to claim 1, 2, 3 or 4, characterized in that the base part has a slot on its front and rear end surfaces in the width direction for accommodating a tool end of a holder in an implant device.

6. An intersomatic cage according to claim 1 or 2 or 3 or 4, characterized in that the cage body is provided with inverted teeth on both its upper and lower height-wise surfaces.

7. An intersomatic cage according to claim 1 or 2 or 3 or 4, characterized in that the cage body and the helical jackscrew are made of medical titanium alloy Ti-6A1-4V, Ti-24Nb-4Zr-8Sn or PEEK material, which is coated with hydroxyapatite coating on its surface.

8. An intersomatic cage according to claim 1 or 2 or 3 or 4, characterized in that the inclination between the posterior and anterior sides of the cage body in the width direction of the cage body is set at one of 0 °, 5 °, 8 ° and 12 °.

9. An intersomatic cage according to claim 1 or 2 or 3 or 4, characterized in that the cage body has a greater thickness on one side than on the other in its width direction, or in that the cage body has a side strut channel with a greater height than the cage body.

10. An intersomatic cage according to claim 1 or 2 or 3 or 4, characterized in that the cage body has a cross section in its height direction which is one of a circular arc surface, an elliptical surface and a rectangular surface.