CN219230076U - Inter-articular fusion device - Google Patents

Abstract

The application discloses an inter-joint fusion device, wherein, the inter-joint fusion device includes supporting part (10) and sets up respectively head (20) and afterbody (30) at supporting part (10) both ends, head (20) follow supporting part (10) are followed the support direction of height of supporting part (10) is gradually and at the terminal tip structure (21) that forms. The head tip structure can be used for guiding the inter-joint fusion device to enter a joint gap with smaller gap, so that the convenience of implantation operation is improved, and the operation difficulty is reduced.

Description

Inter-articular fusion device

Technical Field

The present application relates to the field of surgical medical devices, and more particularly to an intersegmental fusion cage.

Background

Spinal fusion often adopts dorsal-lateral bone grafting fusion, and requires removal of cortical bone from the lateral articular surface of the spinal column, preparation of a bone grafting bed, and mass bone grafting. However, the implanted cancellous bone is absorbed due to no compressive stress stimulation, so that the bone grafting fusion rate is low.

Theoretically, a fusion cage can be placed in the joint space of the spine to improve the success rate of bone grafting fusion and moderately prop open the joint space, thereby improving spinal stenosis. In the prior art, interbody fusion cage is a commonly used implant instrument in the field of spinal surgery. When in use, the interbody fusion cage is placed at the gap of the vertebral body, plays roles of supporting and stabilizing the front column, expanding the gap, recovering the height of the intervertebral foramen and the like, but the gap of the vertebral body is larger than the gap of the vertebral joint, and the interbody fusion cage is difficult to be placed into the gap of the vertebral joint.

Similarly, implantation of interbody fusion cages into the lumbar intervertebral space, which fit between the lumbar vertebral bodies, presents significant difficulties.

Therefore, how to provide a cage suitable for implantation in the joint space is a technical problem that needs to be solved in the art.

Disclosure of Invention

In view of this, the present application proposes an intersegmental fusion cage adapted for implantation in the joint space.

According to the present application, there is provided an inter-joint fusion cage, wherein the inter-joint fusion cage includes a supporting portion and a head portion and a tail portion respectively provided at both ends of the supporting portion, the head portion tapering from the supporting portion along a supporting height direction of the supporting portion and forming a tip structure at a distal end.

Optionally, the head has symmetrically inclined upper and lower surfaces, the upper and lower surfaces being planar.

Optionally, the upper surface and the lower surface form an included angle alpha of 25-35 degrees; and/or, the tip of the tip structure has a rounded surface.

Optionally, the widths of the upper and lower surfaces are the same as the width of the support portion where the head portion is connected; and/or the width of the upper surface and the lower surface is 6mm-10mm.

Optionally, the supporting part includes a supporting top surface and a supporting bottom surface opposite to each other in the supporting height direction, and the supporting top surface and the supporting bottom surface are provided with a roughness structure for increasing friction force.

Optionally, the supporting top surface and the supporting bottom surface are symmetrically inclined close to each other along the direction from the head to the tail, and the included angle between the supporting top surface and the supporting bottom surface is 10 ° -20 °.

Optionally, the inter-joint fusion device is a single piece and includes a top surface, a bottom surface, and a side surface connecting the top surface and the bottom surface, which are opposite along the supporting height direction, and has a hollow structure, wherein: the top surface and the bottom surface are provided with a first through hole P1 communicated into the hollow structure, and the side surface is provided with a second through hole P2 communicated into the hollow structure; and/or, the top surface and/or the bottom surface are/is provided with a jack P3.

Optionally, the tail portion includes a tail top surface and a tail bottom surface opposite in the support height direction, the tail top surface and tail bottom surface extending adjacent to each other in a direction from the head portion to the tail portion, the tail top surface and tail bottom surface having a minimum included angle β of no more than 20 °.

Optionally, the tail portion comprises a rear end face provided with a connection structure for connecting a conveying tool.

Optionally, the total length of the inter-joint fusion device is 9mm-15mm, the width is 7mm-9mm, the height is 2mm-10mm, and the head accounts for 1/3 to 1/2 of the total length of the inter-joint fusion device.

According to the technical scheme of the application, the inter-joint fusion device can be guided into the joint gap with smaller gap through the tip structure of the head, so that the convenience of implantation operation is improved, and the operation difficulty is reduced.

Additional features and advantages of the present application will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 is a front view of an intersectional fusion device according to a preferred embodiment of the present application;

FIG. 2 is a top view of the intersectional fusion device of FIG. 1;

FIG. 3 is a right side view of the intersectional fusion device of FIG. 1;

FIG. 4 is a picture showing the distraction of the lumbar joint space;

FIG. 5 is a view showing the implant of the intersegmental fusion apparatus;

FIG. 6 is a view of a preoperative X-ray examination showing atlantoaxial dislocation;

FIG. 7 is a view showing an X-ray examination after implantation of an intersegmental fusion apparatus;

fig. 8 is an X-ray view showing a period of time after implantation of the joint fusion device.

Detailed Description

The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in combination with embodiments.

The application provides an inter-joint fusion device, wherein, the inter-joint fusion device 100 comprises a supporting part 10, a head part 20 and a tail part 30 which are respectively arranged at two ends of the supporting part 10, wherein the head part 20 is gradually reduced from the supporting part 10 along the supporting height direction of the supporting part 10 and forms a tip structure 21 at the tail end.

Herein, the "supporting height direction" is the height direction of the supporting portion 10, and is the direction of the supporting force for supporting the two side joint surfaces by the supporting portion 10.

With the inter-joint fusion device 100, the inter-joint fusion device can be guided into a joint gap with smaller gap through the tip structure 21 of the head 20, so that the convenience of implantation operation is improved, and the operation difficulty is reduced.

Specifically, upon implantation, the tip structure 21 can first enter into a narrow joint space, and as the inter-articular fusion cage is advanced in its entirety, the tip structure 21 can gradually distract the joint space so that the support 10 can enter and ultimately support at the joint space.

In this application, the head 20 may be tapered in a suitable manner to form the tip structure 21. For example, the head 20 may taper conically. Preferably, in order to avoid applying excessive pressure to the distracted joint surfaces while forming the tip structure 21, the head 20 has symmetrically inclined upper and lower surfaces 22, 23, the upper and lower surfaces 22, 23 being planar, as shown in fig. 1. Thus, the tip structure 21 may be formed by symmetrically inclined upper and lower surfaces 22 and 23 at the ends approaching each other, gradually tapering at the ends on the one hand, and contacting the distracted articular surfaces by the upper and lower surfaces 22 and 23 in planar form on the other hand, thereby avoiding damage to the articular surfaces due to excessive pressure applied to the articular surfaces while facilitating access of the intersegmental fusion apparatus to the articular space.

In order to gradually distract the joint space by the tip structure 21, thereby gradually increasing the pressure on the joint surface, the upper surface 22 and the lower surface 23 may be provided with an appropriate inclination angle. Preferably, the upper surface 22 and the lower surface 23 are at an angle α of 25 ° -35 °.

In addition, in order to avoid unnecessary damage to the articular surface by the tips of the tip structures 21, the tips of the tip structures 21 may have rounded surfaces. In particular, during the manufacture of the intersegmental fusion device, the tip of the tip structure 21 may be subjected to a corresponding rounding or rounding process.

In order to achieve both the implant guiding effect of the tip structure 21 and the effect of stabilizing the upper surface 22 and the lower surface 23 to open the joint space, the proportion of the tip structure 21 to the head 20 may be reasonably set. For example, the tip structure 21 occupies 1/5 to 1/3 of the length of the head 20 in the extending direction of the upper and lower surfaces 22, 23.

As mentioned above, in order to avoid applying excessive pressure to the distracted articular surfaces, head 20 is brought into contact with the articular surfaces by upper surface 22 and lower surface 23, for which purpose upper surface 22 and lower surface 23 may be provided with sufficient width, for example, the width of upper surface 22 and lower surface 23 may be 6mm-10mm. In addition, for ease of manufacture, the widths of the upper and lower surfaces 22 and 23 and the width of the support 10 at the junction with the head 20 may be made the same, preferably the support 10 and the head 20 and tail 30 may be made to have a continuous uniform width.

In addition, preferably, as shown in fig. 1 and 2, the supporting part 10 includes a supporting top surface 11 and a supporting bottom surface 12 opposite in the supporting height direction, and the supporting top surface 11 and the supporting bottom surface 12 may be provided with a roughness structure 13 for increasing friction. By providing the roughness structure 13, the friction between the supporting top surface 11 and the supporting bottom surface 12 and the inter-articular osseous joint surface can be increased, and the inter-articular fusion cage is prevented from being displaced after being implanted in place. Wherein the roughness 13 may take a respective suitable form, for example may be a tooth-like protrusion.

Preferably, as shown in fig. 2, the top and bottom support surfaces 11, 12 are symmetrically inclined toward each other in a direction from the head portion 20 to the tail portion 30 to prevent the intersectant fusion device from exiting the joint space against the implantation direction. The inclination of the support top surface 11 and the support bottom surface 12 is not too great to affect the contact effect with the joint surface, for example, the angle between the support top surface 11 and the support bottom surface 12 may be 10 ° -20 °. Wherein, the protruding heights of the tooth-like protrusions of the support top surface 11 and the support bottom surface 12 may be the same, and the extending direction of the support top surface 11 and the support bottom surface 12 may be determined by the vertex connecting line of the tooth-like protrusions provided thereon.

In this application, the inter-joint fusion device may be a single piece or an assembly, and for convenience of manufacture, it is preferable that the inter-joint fusion device be a single piece. Wherein the inter-joint fusion device may include a top surface, a bottom surface, and side surfaces connecting the top and bottom surfaces, which are opposite in the support height direction, the inter-joint fusion device having a hollow structure (in the embodiment shown in fig. 1 and 2, the hollow structure may be provided across the support 10 and the head 20), wherein: the top surface and the bottom surface are provided with a first through hole P1 communicated into the hollow structure, and the side surface is provided with a second through hole P2 communicated into the hollow structure. By providing the first through-hole P1 and the second through-hole P2, bone ingrowth is facilitated to fuse the inter-articular fusion cage with bone.

The top and/or bottom surfaces of the intersectant fusion device can be provided with a jack P3 for inserting a developing metal wire, so that the position and state of the intersectant fusion device can be tracked and observed after implantation.

Further, as shown in fig. 1 and 3, the tail 30 includes a tail top surface 31 and a tail bottom surface 32 which are opposite in the support height direction, the tail top surface 31 and the tail bottom surface 32 extending close to each other in a direction from the head 20 to the tail 30, thereby forming a lordotic angle which contributes to recovery of physiological lordosis of the affected part. Wherein the tail top surface 31 and the tail bottom surface 32 may be formed as curved surfaces or flat surfaces to extend close to each other in a direction from the head 20 to the tail 30. When the trailing top surface 31 and the trailing bottom surface 32 are planar, the forward convex angle is the angle between the trailing top surface 31 and the trailing bottom surface 32. When the tail top surface 31 and the tail bottom surface 32 are curved surfaces, as shown in fig. 3, the forward convex angle is the minimum value of the included angle formed by the tangential plane of the tail top surface 31 and the tangential plane of the tail bottom surface 32. No matter the tail top surface 31 and the tail bottom surface 32 are plane or curved surfaces, the minimum included angle beta between the tail top surface 31 and the tail bottom surface 32 (the included angle between the tail top surface 31 and the tail bottom surface 32 when the tail top surface 31 and the tail bottom surface 32 are plane, and the minimum included angle beta is the minimum value of the included angle between the tangent plane of the tail top surface 31 and the tangent plane of the tail bottom surface 32 when the tail top surface 31 and the tail bottom surface 32 are curved surfaces) is not more than 20 degrees to help the affected part recover the physiological front convexity.

As shown in fig. 3, the tail portion 30 includes a rear end surface provided with a connection structure 33 for connecting a conveying tool. In use, the intersegmental fusion instrument may be coupled to the delivery tool via the coupling structure 33 for delivery of the intersegmental fusion instrument into the joint space via the delivery tool. The delivery tool may have an adapter structure that mates with the attachment structure 33 for attachment and detachment to ensure a secure attachment of the delivery tool to the inter-articular fusion device upon implantation and to facilitate removal of the delivery tool from the inter-articular fusion device upon implantation for withdrawal of the delivery tool. For example, the connection structure 33 and the adapter structure may be threaded for easy disconnection by rotating the delivery tool after implantation. The delivery tool may be in the form of an elongate rod that facilitates implantation, and the adapter structure may be disposed at one end of the delivery tool in the length direction.

To facilitate implantation in a small joint space, the intersectant fusion device of the present application should be sized to fit the joint space. Specifically, the total length of the intersegmental fusion device (length in the direction from the head 20 to the tail 30) is 9mm-15mm, the width is 7mm-9mm, and the height is 2mm-10mm. Furthermore, to allow for both guided implantation of the head 20 and the function of the rest of the inter-articular fusion device, the head 20 occupies 1/3 to 1/2 of the total length of the inter-articular fusion device. Preferably, the lengths of the supporting portion 10, the head portion 20 and the tail portion 30 each occupy about 1/3 of the total length, so as to achieve both the opening of the supporting portion 10 and the connection and forward protruding restoring effects of the tail portion 30.

The intersomatic cage of the present application may be used for implantation in spinal joint spaces (including spinal joint spaces, thoracic joint spaces, lumbar joint spaces). It will be appreciated that for use with a joint space in a different location, an intersectant fusion device of appropriate gauge may be selected depending on the particular joint space implanted.

The following describes the operation of implanting the intersectant fusion device of the present application by taking a test operation for implanting the intersectant fusion device of the present application in the lumbar intervertebral space as an example.

First, as shown in fig. 4, the joint spreader S is inserted into the lumbar facet to spread the joint space, and the integrity of the osteogenic facet joints of the upper and lower facet joints should be ensured during the spreading process. After the joint gap is spread to a predetermined height, cartilage on the joint surface is scraped off by a joint surface scraper, and the osseous joint surface is exposed. The inter-articular fusion device 100 may then be delivered into the gap between the superior and inferior articular surfaces by a delivery tool such that the support portion 10 is guided into the gap and supported between the superior and inferior articular surfaces by the head portion 20, completing implantation of the inter-articular fusion device 100, as shown in fig. 5. As can be seen in fig. 7, the intersegmental fusion apparatus 100 matches well with the joint space.

The following describes the operation of implanting the intersectant fusion device of the present application by taking a trial operation of implanting the intersectant fusion device of the present application in the lateral mass joint space of the atlantoaxial.

Firstly, the joint spreader is inserted into the articular surface of the atlantoaxial so as to spread the joint gap and loosen the tension band in front of the atlantoaxial, and the integrity of the bony articular surfaces of the upper and lower articular surfaces is ensured in the spreading process. After the joint gap is spread to a predetermined height, cartilage on the joint surface is scraped off by a joint surface scraper, and the osseous joint surface is exposed. The inter-articular fusion device may then be delivered into the gap between the superior and inferior articular surfaces by a delivery tool such that the support portion 10 is guided into the gap and supported between the superior and inferior articular surfaces by the head portion 20, completing the implantation of the inter-articular fusion device. The atlantoaxial dislocation of the patient (i.e., before implantation) is illustrated in fig. 6, fig. 7 shows the case of implantation of the intersegmental fusion device 100 after a period of time, and fig. 8 shows the case of implantation of the intersegmental fusion device 100 after a period of time, it can be seen that the intersegmental gap forms a strong bony fusion, which benefits from the intersegmental fusion promoted by the intersegmental fusion device 100.

The preferred embodiments of the present application have been described in detail above, but the present application is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present application within the scope of the technical concept of the present application, and all the simple modifications belong to the protection scope of the present application.

In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described in detail.

Moreover, any combination of the various embodiments of the present application may be made without departing from the spirit of the present application, which should also be considered as disclosed herein.

Claims (10)

1. An inter-joint fusion device, characterized in that the inter-joint fusion device (100) comprises a supporting part (10) and a head part (20) and a tail part (30) which are respectively arranged at two ends of the supporting part (10), wherein the head part (20) is gradually reduced from the supporting part (10) along the supporting height direction of the supporting part (10) and forms a tip structure (21) at the tail end.

2. An intersegmental fusion device according to claim 1, wherein the head (20) has symmetrically inclined upper (22) and lower (23) surfaces, the upper (22) and lower (23) surfaces being planar.

3. The intersegmental fusion apparatus according to claim 2, wherein the upper surface (22) and the lower surface (23) form an included angle α of 25 ° -35 °; and/or the tips of the tip structures (21) have rounded surfaces.

4. The intersegmental fusion device according to claim 2, wherein the widths of the upper surface (22) and lower surface (23) are the same as the width of the support portion (10) at the junction with the head portion (20); and/or the width of the upper surface (22) and the lower surface (23) is 6mm-10mm.

5. An intersegmental fusion device according to claim 1, wherein the support portion (10) comprises a support top surface (11) and a support bottom surface (12) opposite in the support height direction, the support top surface (11) and the support bottom surface (12) being provided with a roughness (13) for increasing friction.

6. An intersegmental fusion device according to claim 5, wherein the support top surface (11) and the support bottom surface (12) are symmetrically inclined towards each other in the direction from the head (20) to the tail (30), the support top surface (11) and the support bottom surface (12) having an angle of 10 ° -20 °.

7. The intersectant fusion device according to claim 1, wherein the intersectant device is one-piece and comprises a top surface, a bottom surface, and side surfaces connecting the top and bottom surfaces, which are opposite in the support height direction, the intersectant device having a hollow structure, wherein: the top surface and the bottom surface are provided with a first through hole P1 communicated into the hollow structure, and the side surface is provided with a second through hole P2 communicated into the hollow structure; and/or, the top surface and/or the bottom surface are/is provided with a jack P3.

8. An intersegmental fusion apparatus according to claim 1, wherein the tail (30) comprises a tail top surface (31) and a tail bottom surface (32) opposite in the direction of the support height, the tail top surface (31) and tail bottom surface (32) extending adjacent to each other in the direction from the head (20) to the tail (30), the minimum included angle β of the tail top surface (31) and tail bottom surface (32) not exceeding 20 °.

9. An intersegmental fusion device according to claim 1, wherein the tail portion (30) comprises a rear end surface provided with a connection structure (33) for connecting a delivery means.

10. The intersectant device according to any one of claims 1-9, wherein the intersectant device has a total length of 9-15 mm, a width of 7-9 mm, and a height of 2-10 mm, and wherein the head (20) comprises 1/3 to 1/2 of the total length of the intersectant device.

Images