CN214967168U

CN214967168U - interbody cage

Info

Publication number: CN214967168U
Application number: CN202120092572.2U
Authority: CN
Inventors: 郝晓艳
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-01-13
Filing date: 2021-01-13
Publication date: 2021-12-03
Anticipated expiration: 2031-01-13

Abstract

The utility model discloses an intervertebral fusion cage, comprising: a distal support block and a proximal support block, wherein the distal support block and the proximal support block are used to be relatively arranged on two adjacent vertebral bodies. between the end plates; a connecting rod, one end of the connecting rod is fixedly connected with the middle of the distal support block, and the other end of the connecting rod is detachably connected with the proximal support block; the distal auxiliary support piece, The distal support includes two hinged support rods, the middle of the two support rods is hinged, the first ends of the two support rods are provided with auxiliary support blocks, and the second ends of the two support rods are capable of Both are relatively fixed to the connecting rod, and the auxiliary support blocks of the first ends of the two supporting rods are relatively fixed when the second ends of the two supporting rods are both relatively fixed to the connecting rod. The intervertebral fusion device provided by the utility model can provide a larger bone grafting area, and is less prone to subsidence, which is beneficial to improving the operation effect.

Description

Intervertebral fusion device

Technical Field

The utility model relates to the technical field of medical equipment, especially relate to an interbody fusion cage.

Background

The intervertebral Cage, also called Cage, is a container for bone and bone substitute material particles. Some operations require fusion of adjacent vertebral bodies by implanting bone or artificial bone into the vertebral body space, and after a period of time, the two vertebral bodies grow into a whole. If the intervertebral space only implants granular bones or artificial bones, no mechanical supporting force exists, the intervertebral space height cannot be maintained, a lot of problems are brought, the operation effect is influenced, and therefore the bones are placed into the fusion cage and then are stuffed into the intervertebral space, and the fusion cage is used as a supporting body while being used as a container to maintain the intervertebral space height.

The current intervertebral fusion device mainly has the following defects: the bone grafting area is small, and the bone grafting amount and the fusion rate are influenced; the fusion cage is in the middle position of weak sclerotin at the contact position of intervertebral space and end plate, and is easy to subside and sink into the centrum: the movement of the fusion cage in the intervertebral space can also cause the loss of the intervertebral height and the lordotic angle of the spine in cooperation with the sedimentation; the fusion cage is mainly made of PEEK, the elastic modulus of the fusion cage is equivalent to that of cortical bone and far higher than vertebral body bone, strong stress shielding can be formed, the surgical effect can be influenced by the factors, and most of the fusion cage needs to be matched with a metal implant for internal fixation, so that more complications can be generated and the burden of a patient is increased. Therefore, how to improve the intervertebral cage to meet higher requirements becomes a technical problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides an interbody fusion cage, this interbody fusion cage can provide great bone grafting area, makes the support at the strongest position of endplate, and difficult emergence is subsided and is removed, fuses rapidly and fuses the rate height, thoroughly eliminates and shelters from the stress of fusing the bone, is favorable to improving the operation effect.

In order to achieve the above object, the utility model provides a following technical scheme:

an intervertebral cage comprising:

a distal support block and a proximal support block for opposing placement between endplates of two adjacent vertebral bodies;

one end of the connecting rod is fixedly connected with the middle part of the far-side supporting block, and the other end of the connecting rod is detachably connected with the near-side supporting block;

the far-side auxiliary supporting piece comprises two hinged supporting rods, the middle parts of the two supporting rods are hinged, auxiliary supporting blocks are arranged at the first ends of the two supporting rods, the second ends of the two supporting rods can be fixed relative to the connecting rod, and the second ends of the two supporting rods are fixed relative to the auxiliary supporting blocks at the first ends of the two supporting rods when the connecting rod is fixed relative to the connecting rod.

Preferably, in the intervertebral fusion cage, the second ends of the two support rods are provided with hoop plates with grooves, and the hoop plates of the two support rods can jointly hold the connecting rod tightly.

Preferably, in the above intervertebral cage, a first end of the connecting rod is connected to the distal support block and a second end is connected to the proximal support block, and the diameter of the connecting rod increases from the second end to the first end;

after the connecting rod is inserted between the hoop plates of the two supporting rods, the hoop plates of the two supporting rods gradually move along the direction from the second end to the first end of the connecting rod, so that the hoop plates of the two supporting rods are gradually and relatively far away, and the auxiliary supporting blocks of the two supporting rods are relatively far away.

Preferably, in the above intervertebral fusion device, a blocking member is further included for preventing the hoop plates of the two support rods from moving from the first end to the second end of the connecting rod;

the blocking piece is sleeved with a blocking ring on the connecting rod, the inner wall of the blocking ring is provided with a blocking protrusion, and the connecting rod is provided with a blocking groove matched with the blocking protrusion.

Preferably, in the above intervertebral fusion device, the blocking slot includes a first section and a second section connected in sequence, the first section extends along the length direction of the connecting rod, and the second section extends along the circumferential direction of the connecting rod; the blocking protrusion slides to the tail end of the blocking groove along the first section of the blocking groove and then rotates to enter the second section of the blocking groove.

Preferably, in the above intervertebral fusion device, the blocking member further includes blocking teeth fixedly connected to the outer wall of the blocking ring, and the blocking protrusion can rotate along the second section of the blocking groove until the blocking teeth extend into the bone groove of the vertebral body.

Preferably, in the intervertebral fusion device, one ends of the two hoop plates, which are far away from the supporting rod, are in concave-convex fit; or,

one end of the hoop plate, which deviates from the supporting rod, is provided with sawteeth, and the sawteeth of the two hoop plates can be mutually meshed.

Preferably, the intervertebral fusion device further comprises a locking nut, and the end of the connecting rod connected with the proximal supporting block is provided with a thread for matching with the locking nut; the middle part of the near side supporting block is provided with a through hole for the end part of the connecting rod to pass through, and the locking nut is positioned on one side of the near side supporting block, which is far away from the far side supporting block, and is used for fixedly connecting the near side supporting block and the connecting rod;

the through hole of the near side supporting block is a non-circular hole, and the part of the connecting rod matched with the non-circular hole is non-circular.

Preferably, in the above intervertebral fusion device, the positions of the distal supporting block, the proximal supporting block and/or the auxiliary supporting block for contacting with the bone surface are provided with pad grooves;

the bone fracture plate is characterized by further comprising a flexible pad arranged in the pad groove, and the flexible pad is used for being in contact with a bone surface.

Preferably, the intervertebral cage further comprises a locking nut and an advancing sleeve, wherein the distal supporting block and the proximal supporting block are used for being oppositely arranged between the end plate edges of two adjacent vertebral bodies; one end of the connecting rod is hinged with the middle part of the far-side supporting block, and the other end of the connecting rod is provided with a thread matched with the locking nut; the pushing sleeve is sleeved on the connecting rod and is in threaded connection with the connecting rod, and the pushing sleeve is used for jacking the far-side supporting block to enable the far-side supporting block to rotate relative to the connecting rod; the middle part of the near side supporting block is provided with a through hole for the end part of the connecting rod to pass through, and the locking nut is positioned on one side of the near side supporting block, which is far away from the far side supporting block, and is used for fixedly connecting the near side supporting block and the connecting rod.

According to the technical scheme, the utility model provides an among the interbody fusion cage, distal side supporting shoe and near side supporting shoe are used for arranging relatively between the endplate edge of two adjacent centrums, both combine through the connecting rod, during the operation, earlier assemble connecting rod and distal side supporting shoe, squeeze into the intervertebral space, let distal side supporting shoe support at the centrum to the edge, then plant the bone in the intervertebral space, fill up the intervertebral space after, put into near side supporting shoe, insert the tip of connecting rod in the through-hole of near side supporting shoe, and support near side supporting shoe at centrum near side edge, twist lock nut at last and let connecting rod and near side supporting shoe fastening connection.

Because the utility model discloses an interbody fusion cage adopts modular structure, and whole occupation space is less, and distal side supporting shoe with the near side supporting shoe is located the edge of centrum, so this interbody fusion cage can provide great bone grafting area to the intervertebral space is directly packed to the bone substitute material, no matter how the end plate shape is from top to bottom, the bone substitute material all can rather than contact closely, and the fusion cage can not remove moreover, and the time of fusing like this can shorten greatly. Meanwhile, the edge of the vertebral end plate has the strongest pressure bearing capacity, and the part in contact with the bone is made of flexible high polymer materials, so that the stress can be dispersed to the greatest extent, and the auxiliary support part can be used for helping to bear the pressure for patients with obesity or osteoporosis, so that the intervertebral fusion cage is not easy to subside, the stress shielding of the fusion cage on fused bone is thoroughly eliminated by the flexible cushion, and the operation effect is favorably improved by the advantages.

Drawings

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

Fig. 1 is a front view of an intervertebral cage according to an embodiment of the present invention;

FIG. 2 is a bottom view of FIG. 1;

FIG. 3 is a cross-sectional view of FIG. 1;

FIG. 4 is a schematic view of the distal support block 1 of FIG. 3;

fig. 5 is a schematic view of the connecting rod 2 of fig. 3;

FIG. 6 is a schematic view of the proximal support block 3 of FIG. 3;

FIG. 7 is a schematic view of the locking nut 4 of FIG. 3;

FIG. 8 is a cross-sectional view of FIG. 7;

FIGS. 9a, 9b and 9c are schematic views of an intervertebral cage according to an embodiment of the present invention in three states of use;

FIG. 10 is a cross-sectional view of an intervertebral cage according to a second embodiment of the present invention;

FIG. 11 is a bottom view of FIG. 10;

FIG. 12 is a schematic view of the proximal support block 3 of FIG. 10;

FIG. 13 is a bottom view of FIG. 12;

fig. 14 is a schematic view of the proximal side supporting block 3 in the intervertebral cage according to the third embodiment of the present invention;

fig. 15 is a front view of an intervertebral cage according to a fourth embodiment of the invention;

fig. 16 is a side view of an intervertebral cage according to a fourth embodiment of the invention (with the proximal support block 3 omitted);

fig. 17a and 17b are two schematic structural views of a connecting rod 2 in an intervertebral cage according to a fourth embodiment of the present invention;

FIG. 18 is a partial cross-sectional view of an intervertebral cage according to another embodiment of the invention;

FIG. 19 is a partial top view of another embodiment interbody cage of the present invention;

FIG. 20 is a partial top view from another angle of another embodiment of an intervertebral cage according to the invention;

FIG. 21 is a schematic view of another embodiment of the intervertebral cage according to the invention;

FIG. 22 is a schematic view of a distal support block according to another embodiment of the present invention;

FIG. 23 is a schematic view of a flexible mat according to another embodiment of the present invention;

fig. 24 is a schematic structural view of a connecting rod according to another embodiment of the present invention;

fig. 25 is a schematic structural diagram of a blocking member according to another embodiment of the present invention.

Labeled as:

1-distal supporting block, 1 a-pad groove, 2-connecting rod, 21-blocking groove, 3-proximal supporting block, 31-sinking groove, 32-accommodating groove and 33-accommodating hole; 34-a positioning projection; 4-a locking nut; 5-vertebral body; 6-locking post; 7-pushing sleeve, 8-distal auxiliary supporting piece, 81-auxiliary supporting block, 82-supporting rod, 83-hoop plate, 9-flexible pad, 91-inserting column, 10-blocking ring, 101-blocking protrusion and 11-blocking tooth.

Detailed Description

In view of this, the utility model provides an interbody fusion cage, this interbody fusion cage can provide great bone grafting area, and support intensity is difficult for taking place to subside greatly, has eliminated the stress to implanting the sclerotin and has sheltered from, has reliable stabilising arrangement, is favorable to improving the operation effect.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3 and 18-21, the intervertebral cage according to the present invention is a combined structure including a distal support block 1, a connecting rod 2, a proximal support block 3 and a distal auxiliary support 8, wherein the distal support block 1 and the proximal support block 3 are used to be oppositely disposed between the endplates of two adjacent vertebral bodies 5, and particularly, the distal support block 1 and the proximal support block 3 may be used to be oppositely disposed between the endplate edges of two adjacent vertebral bodies 5 (see fig. 9a, 9b and 9 c). One end of the connecting rod 2 is fixedly connected with the middle part of the far-side supporting block 1, and the other end of the connecting rod is detachably connected with the near-side supporting block 3.

During operation, firstly, the assembled far-side supporting block 1 and the connecting rod 2 are driven into the intervertebral space, the far-side supporting block 1 is supported at the opposite side edges of the vertebral body 5, then, bones are implanted into the intervertebral space, after the intervertebral space is filled, the near-side supporting block 3 is put in, and the end part of the connecting rod 2 is fixedly connected with the near-side supporting block 3.

According to the above operation process, the utility model discloses an interbody fusion cage adopts composite structure, and whole occupation space is less, and in addition, distal side supporting shoe 1 and near side supporting shoe 3 are located the edge of centrum 5, and consequently, this interbody fusion cage can provide great bone grafting area, because the intervertebral space is directly packed to bone substitute material, no matter how the end plate shape is from top to bottom, bone substitute material all can rather than the close contact, fuses the time like this and can shorten greatly. In addition, the edge of the vertebral body end plate has the strongest pressure bearing capacity, so the intervertebral fusion cage is not easy to subside, and is beneficial to improving the operation effect. It should be noted that two opposite edges of the distal support block 1 respectively abut against two adjacent vertebral bodies, and two opposite edges of the proximal support block 3 respectively abut against two adjacent vertebral bodies, so as to realize the common support of the distal support block 1 and the proximal support block 3.

In the above embodiment, the distal auxiliary support member 8 includes two support rods 82 hinged, and the two support rods 82 are hinged in the middle. In other words, the middle of one of the support rods 82 is hinged to the middle of the other support rod 82, and the two support rods 82 resemble a scissor-like shape.

The first ends of the two support rods 82 are provided with auxiliary support blocks 81, and the second ends of the two support rods 82 can be fixed relative to the connecting rod 2. The two support rods 82 rotate relatively, so that the first ends of the two support rods 82 are far away from each other, the two auxiliary support blocks 81 are far away from each other, and the second ends of the two support rods 82 are also far away from each other. The two support rods 82 rotate relative to each other, so that the first ends of the two support rods 82 are close to each other, the two auxiliary support blocks 81 are close to each other, and the second ends of the two support rods 82 are also close to each other. When the second ends of the two support rods 82 are both fixed relative to the connecting rod 2, the auxiliary support blocks 81 at the first ends of the two support rods 82 are fixed relative to each other.

For osteoporotic or obese patients, stable support cannot be achieved with the distal support block 1 alone, and the distal support block 1 may be used to support in conjunction with the distal auxiliary support 8. During the use, can make two bracing pieces 82 rotate relatively to the distance between two auxiliary supporting blocks 81 is nearest, and the distance between two bracing piece 82 second ends is also nearest this moment, be convenient for put into and remove in the intervertebral space, until the distal auxiliary supporting piece 8 remove to suitable position after, all with the second end of two bracing pieces 82 and connecting rod 2 relatively fixed, two bracing pieces 82 can not rotate relatively again this moment to make two auxiliary supporting blocks 81 also relatively fixed and two auxiliary supporting blocks 81 offset with two adjacent centrums respectively, realized auxiliary support.

It should be noted that, when the two auxiliary supporting blocks 81 are relatively fixed and the two auxiliary supporting blocks 81 respectively abut against the two adjacent vertebral bodies, the distance between the surfaces of the two auxiliary supporting blocks 81 departing from each other is greater than the length of the distal supporting block 1 along the height direction of the intervertebral space. In particular, the distance between the surfaces of the two auxiliary support blocks 81 facing away from each other is slightly greater than the length of the distal support block 1 in the direction of the height of the intervertebral space. Wherein the disc space height refers to the direction from one vertebral body to another vertebral body adjacent thereto.

The support bar 82 may be a bent bar so as to set the positions of the two auxiliary support blocks 81 according to actual conditions.

In a specific embodiment, the second ends of the two support rods 82 are provided with a hoop plate 83 having a groove, and the hoop plates 83 of the two support rods 82 can jointly embrace the connecting rod 2. Namely, the two hoop plates 83 are respectively fixedly connected with the second ends of the two support rods 82, each hoop plate 83 is provided with a groove, and the grooves of the two hoop plates 83 are oppositely arranged and jointly accommodate the connecting rod 2. The connecting rod 2 supports the distance between the two hoop plates 83 to the maximum, so that the second ends of the two supporting rods 82 are relatively far away from the maximum distance, and the distance between the two hoop plates 83 is the maximum at the moment, so that the two hoop plates 83 jointly hold the connecting rod 2 tightly, and the relative fixation of the two hoop plates 83 and the connecting rod 2 is realized.

In the above embodiment, the inner wall of the groove of the hoop plate 83 may be a cambered surface, so that the inner wall of the groove is more attached to the connecting rod 2. The angle subtended by the inner walls of the recesses may be less than 180 deg. to facilitate the two straps 83 to grip the connecting rod 2 together.

Further, a first end of the connecting rod 2 is connected to the distal support block 1, and a second end of the connecting rod 2 is connected to the proximal support block 3, and the diameter of the connecting rod 2 gradually increases from the second end to the first end thereof.

After the connecting rod 2 is inserted between the strap plates 83 of the two support rods 82, the strap plates 83 of the two support rods 82 are gradually moved in a direction from the second end to the first end of the connecting rod 2 so that the strap plates 83 of the two support rods 82 are gradually relatively far away and the auxiliary support blocks 81 of the two support rods 82 are relatively far away. Specifically, after the connecting rod 2 is inserted into the groove between the two hoop plates 83, the hoop plates 83 and the distal auxiliary supporting member 8 are integrally and gradually moved along the direction from the second end to the first end of the connecting rod 2, because the diameter of the connecting rod 2 is gradually increased, the connecting rod 2 gradually expands the two hoop plates 83 to gradually increase the distance between the two hoop plates 83, and meanwhile, the distance between the two auxiliary supporting blocks 81 is also gradually increased until the connecting rod 2 gradually expands the distance between the two hoop plates 83 to the maximum, so that the two hoop plates 83 jointly clasp the connecting rod 2, and at this time, the two auxiliary supporting blocks 81 are also moved to a proper distance, so that the two auxiliary supporting blocks 81 respectively abut against the two adjacent vertebral bodies, and auxiliary supporting is realized.

Of course, the diameter of the connecting rod 2 may be constant, and the two hoop plates 83 may be fixed by other means, such as fastening bolts, so that the two hoop plates 83 jointly embrace the connecting rod 2, which is not limited herein.

In order to prevent the two hoop plates 83 from moving in opposite directions after the distal auxiliary support 8 is installed, i.e. to prevent the two hoop plates 83 from gradually moving in the direction from the first end to the second end of the connecting rod 2, which results in the failure of the auxiliary support, in the above embodiment, the intervertebral cage further comprises a stopper for preventing the hoop plates 83 of the two support rods 82 from moving in the direction from the first end to the second end of the connecting rod 2. Specifically, the blocking member may abut against the strap plates 83 to block the strap plates 83 of the two support rods 82 from moving in the direction from the first end to the second end of the connecting rod 2.

Optionally, the blocking member includes a blocking ring 10 sleeved on the connecting rod 2, a blocking protrusion 101 is disposed on an inner wall of the blocking ring 10, and a blocking groove 21 matched with the blocking protrusion 101 is disposed on the connecting rod 2. The blocking protrusion 101 prevents the blocking ring 10 from rotating away from the connecting rod 2 after being seated in the blocking groove 21. The stop ring 10 abutting the strap plates 83 prevents the two strap plates 83 from moving in the direction from the first end to the second end of the connecting rod 2.

The blocking groove 21 may include a first section and a second section connected in sequence, the first section of the blocking groove 21 extending along the length direction of the connecting rod 2, and the second section of the blocking groove 21 extending along the circumferential direction of the connecting rod 2. The blocking protrusion 101 slides along the first section of the blocking groove 21 to its end and then rotates to enter the second section of the blocking groove 21. The second segment of the blocking slot 21 is connected to the end of the first segment near the distal support block 1. Thus, the blocking protrusion 101 slides along the first section of the blocking groove 21 until sliding to the joint of the first section and the second section of the blocking groove 21, and then the blocking protrusion 101 slides into the second section of the blocking groove 21, so as to prevent the blocking ring 10 from moving along the direction from the first end to the second end of the connecting rod 2.

Furthermore, the blocking piece also comprises a blocking tooth 11 fixedly connected with the outer wall of the blocking ring 10, and the blocking protrusion 101 can rotate along the second section of the blocking groove 21 until the blocking tooth 11 extends into a bone groove of the vertebral body, wherein the bone groove can be prepared in advance. In other words, the blocking protrusion 101 can rotate along the second segment of the blocking groove 21 until the blocking tooth 11 extends into the bone groove of the pre-made vertebral body, and the blocking tooth 11 is perpendicular to the intervertebral space between the two adjacent vertebral bodies. So can prevent the integral movement of the assembled fusion cage, realize the integral fixation of the fusion cage.

The number of the blocking teeth 11 may be one or more, and the number of the optional blocking teeth may also be two, which is not limited herein.

Of course, the blocking groove 21 may be a circular groove or a square groove, and is not limited herein.

In another embodiment, a first section of the blocking groove 21 extends along the length direction of the connecting rod 2, a second section of the blocking groove 21 extends along the circumferential direction of the connecting rod 2, and the depth of the second section of the blocking groove 21 may gradually decrease in a direction away from the first section. As shown in fig. 17a and 17b, when the hinged end of the connecting rod 2 and the distal support block 1 is spherical or rod-shaped, the first section of the blocking groove 21 extends along the length direction of the connecting rod 2, the second section of the blocking groove 21 extends along the circumferential direction of the connecting rod 2, the depth of the second section of the blocking groove 21 can be gradually reduced along the direction away from the first section, so that the abutting force between the blocking protrusion 101 and the bottom of the blocking groove 21 is gradually increased when the blocking protrusion 101 slides along the second section of the blocking groove 21, and finally the blocking ring 10 is slightly deformed, so that the blocking protrusion 101 can be prevented from reversely sliding along the second section of the blocking groove 21.

Of course, the two hoop plates 83 can be prevented from moving from the first end to the second end of the connecting rod 2 by other means, such as a blocking post inserted into the connecting rod 2, but not limited thereto.

Alternatively, the second end of the supporting rod 82 may be fixed relative to the connecting rod 2 by other means, such as a stud passing through the second end of the supporting rod 82 and the connecting rod 2, which is not limited herein.

Connecting rod 2 can be with 1 threaded connection of distal side supporting shoe, when carrying out the equipment of connecting rod 2 and distal side supporting shoe 1, does not screw up the screw thread of connecting rod 2 to tightest earlier, and after 8 installation completions of distal side auxiliary support piece, the back is accomplished in the installation of barrier ring 10, can rotate connecting rod 2 and adjust the position of barrier ring 10 and blocking tooth 11 to make blocking tooth 11 stretch into in one of two adjacent centrums.

Optionally, the ends of the two straps 83 facing away from the support rod 82 are male-female fitted. Namely, one end of one hoop plate 83 departing from the supporting rod 82 is provided with a protrusion, one end of the other hoop plate 83 departing from the supporting rod 82 is provided with a protrusion and a groove, and one ends of the two hoop plates 83 departing from the supporting rod 82 are matched in a concave-convex mode to prevent the connecting rod 2 from being separated from the hoop plates 83.

As shown in fig. 18, the end of the strap 83 facing away from the support rod 82 is provided with serrations, and the serrations of the two strap 83 can engage with each other. This prevents the connecting rod 2 from coming out between the strap plates 83.

In another embodiment, the above-described intervertebral cage further comprises a locking nut 4. One end of the connecting rod 2, which is used for being connected with the near side supporting block 3, is provided with a thread which is used for being matched with a locking nut 4; the middle part of the near side supporting block 3 is provided with a through hole for the end part of the connecting rod 2 to pass through, and the locking nut 4 is positioned on one side of the near side supporting block 3 far away from the far side supporting block 1 and used for tightly connecting the near side supporting block 3 and the connecting rod 2.

The through hole of the near side supporting block 3 is a non-circular hole, and the part of the connecting rod 2 matched with the non-circular hole is non-circular. Preferably, the section of the through hole of the proximal support block 3 may be elliptical, and the section of the portion of the connecting rod 2 that is engaged with the non-circular hole may also be elliptical. This prevents relative rotation of the connecting bar and the proximal support block 3.

As shown in fig. 22-23, the positions of the distal support block 1 and/or the proximal support block 3 for contact with the bone surface are provided with pad grooves 1 a. The intervertebral fusion device also comprises a flexible pad 9 arranged in the pad groove 1a, and the flexible pad 9 is used for contacting with the bone surface. The flexible pad 9 may be made of polymer material, and the surface thereof may be slightly convex, so that the contact area is maximized and the stress is dispersed when the pad is in contact with the bone surface.

Specifically, the distal support block 1, the proximal support block 3 and/or the auxiliary support block 81 may be provided with pad grooves 1a on three surfaces, the flexible pads 9 are sleeved in the pad grooves 1a, and the distal support block 1, the proximal support block 3 and/or the auxiliary support block 81 are provided with screw holes to prevent the flexible pads from falling off by pressing the flexible pads with screws penetrating through the screw holes.

Alternatively, pad grooves may be provided only on the bone-contacting surfaces of the distal support block 1, the proximal support block 3 and/or the auxiliary support block 81, and an overlap bridge may be provided at the notches of the pad grooves to prevent the flexible pads from being detached.

In this embodiment, the connecting rod 2 is in threaded connection with the distal support block 1. As shown in fig. 4 and 5, a threaded hole is opened in the middle of the distal support block 1, external threads are provided at both ends of the connecting rod 2, the external threads at the upper end in fig. 5 are used for matching with the threaded hole of the distal support block 1, and the external threads at the lower end are used for matching with the threaded hole of the locking nut 4. Of course, in other embodiments, the connecting rod 2 and the distal support block 1 may be connected by other connection methods such as a snap, or the two may be designed as an integral structure, that is, the connecting rod 2 and the distal support block 1 are integrally formed.

As shown in fig. 5 and 8, in order to facilitate assembly and achieve a stable effect, in the present embodiment, one end of the connecting rod 2 near the locking nut 4 is cone-shaped, and correspondingly, the threaded hole of the locking nut 4 is also cone-shaped. In order to prevent as much looseness as possible between the connecting rod 2 and the proximal support block 3, the through hole of the proximal support block 3 should have a tapered hole portion that fits the tapered end of the connecting rod 2.

The cone-shaped end of the connecting rod 2 can enable the port of the long and thin hose to be sleeved on the connecting rod and can be pulled out after installation is completed, so that in operation, in order to prevent difficulty in assembling the near side supporting block 3 and the connecting rod 2, the long and thin hose can be sleeved at the cone-shaped end thread of the connecting rod 2, then the other end of the hose can penetrate through the through hole of the near side supporting block 3, under the guiding effect of the hose, the near side supporting block 3 can be easily sleeved on the connecting rod 2, and finally the hose is pulled out and the locking nut 4 is screwed on the connecting rod 2.

In order to avoid as much space as possible for the locking nut 4, the through-hole of the proximal support block 3 is preferably a countersunk hole, as shown in fig. 6, the through-hole of the proximal support block 3 having a countersunk groove 31 for receiving the locking nut 4, the locking nut 4 being located in the countersunk groove 31 when the locking nut 4 is screwed onto the connecting rod 2, as shown in fig. 3.

In order to improve the firmness, in the present embodiment, the groove wall of the counter sink 31 is provided with an internal thread which cooperates with the external thread of the locking nut 4. As shown in fig. 2 and 3, in the present embodiment, the locking nut 4 is an inner hexagonal nut, and since the threaded hole of the locking nut 4 occupies a large portion of the thickness, the recess for inserting the inner hexagonal wrench is usually shallow, and the shallow recess is not favorable for the inner hexagonal wrench to normally function.

In specific practical application, the locking nut 4 can be made of a material with slight toughness, and the thread pitches of the outer thread and the inner thread are designed to be slightly different, so that the locking nut 4 is tightly screwed, and the firmness of assembly is enhanced.

9a, 9b and 9c show three states of use of the intervertebral cage provided by this embodiment, and it can be seen that the placement of the distal support block 1 and the proximal support block 3 on the vertebral body 5 can be determined according to the specific approach scheme of the operation. It should be noted that the "distal" of the "distal support block" and the "proximal" of the "proximal support block" are relative to the incision site of the surgical approach, i.e., the "distal support block" is placed first and is located opposite the surgical incision, and the "proximal support block" is placed last and is located at the surgical incision site during the surgical procedure. It will be readily appreciated that the profile of the distal support block 1 and the proximal support block 3 should be designed according to the anatomy of the spine, for example, in the case of the positioning requirement on the left side of fig. 9a, the proximal support block 3 should be designed according to the profile shown in fig. 2, i.e. the frontal profile is wedge-shaped, due to the difference in the anteroposterior inter-vertebral spacing.

The interbody fusion cage can be additionally provided with the locking columns 6, so that the interbody fusion cage can be used for stabilizing the vertebral body, partial operations do not need to be performed in the in-row fixation like the traditional operation, and meanwhile, the locking columns 6 can prevent the overall movement of the interbody fusion cage.

Specifically, in the present embodiment, the near-side supporting block 3 is provided with an accommodating groove 32 communicating with the sinking groove 31 of the through hole beside the through hole, as shown in fig. 13, a groove wall of the accommodating groove 32 is provided with an accommodating hole 33 communicating to a surface of the near-side supporting block 3 close to one side of the vertebral end plate, and the locking column 6 is provided in the accommodating hole 33 for being driven into the vertebral body.

During operation, before the proximal support block 3 is placed, the locking column 6 is hidden in the accommodating groove 32, a locking hole is drilled at a position of a few millimeters away from the edge of the vertebral body, the accommodating hole 33 is aligned with the locking hole after the proximal support block 3 is placed, then one part of the locking column 6 hidden in the accommodating groove 32 is pushed into the locking hole, the other part of the locking column is still left in the proximal support block 3, and finally the locking nut 4 is screwed in, as shown in fig. 10 and 11, the locking nut 4 is abutted against one end of the locking column 6 while the proximal support block 3 and the connecting rod 2 are fixed by the locking nut 4, so that the locking column is prevented from being withdrawn.

For the condition that the height of the fusion cage is larger, for example, the cervical vertebra sub-total cut fusion cage, two connecting rods 2 are needed to be arranged to ensure the stability of the fusion cage, and on the basis of the second embodiment, the upper contact surface and the lower contact surface of the near side supporting block 3 are all needed to be provided with the locking columns 6 to ensure that people can feel relieved without being fixed in the titanium plate. Referring to fig. 13 and 14, the proximal support block 3 thus has two through holes arranged one above the other, each of which is provided next to a respective receiving groove 32 and a receiving hole 33.

As shown in fig. 14, to prevent misalignment of the upper and lower locking posts 6 into the locking holes during implantation, a positioning protrusion 34 may be provided on the upper and lower surfaces of the proximal support block 3 opposite the vertebral endplates. During operation, a guide is used for making a groove in the corresponding part of the vertebra in advance, and the same guide is used for making an upper locking hole and a lower locking hole, so that the upper locking column 6 and the lower locking column 6 can be aligned to the locking holes as long as the positioning bulge 34 of the near side supporting block 3 is punched into the groove. The structure of the double connecting rods can also replace the small locking columns with double blocking teeth.

In specific practice, the lumbar vertebra posterior fusion cage is used most, but is also designed most difficultly, because the fusion cage needs to be placed in from the posterior margin of the vertebral body, the posterior margin of the lumbar vertebra is smaller than the anterior margin, the height of the fusion cage which can be directly placed in is not enough for the anterior margin, which is an important reason that the postoperation anterior convexity of the vertebral space is not enough, and the requirement on the height of the anterior margin is met, but the fusion cage cannot be directly placed in from the posterior margin. To this end, the present embodiment provides an intervertebral cage which is designed to connect the connecting bar 2 and the distal support block 1 in an articulated relationship, and is additionally provided with a pushing sleeve 7, as shown in fig. 15 and 16, wherein the pushing sleeve 7 is sleeved on the connecting bar 2 and is in threaded connection with the connecting bar 2, and the pushing sleeve 7 is used for pressing the distal support block 1 to rotate relative to the connecting bar 2.

From the side view shown in fig. 16, the connecting rod 2 and the distal support block 1 can be relatively angled with the joint of the two as an axis, so that the overall thickness can be reduced firstly when the connecting rod and the distal support block are put in place, then the pushing sleeve 7 is screwed, and the distal support block 7 is gradually pushed to be perpendicular to the connecting rod 2 along with the advance of the pushing sleeve 7, so that the distal support block 1 meeting the requirement of the height of the front edge gap of the vertebral body can be smoothly put in from the rear edge gap.

To increase the stability, the present exemplary embodiment provides the end of the thrust sleeve 7 close to the distal support block 1 in the form of a flange. Fig. 17a and 17b show two configurations of the connecting rod 2 that can be hinged to the distal support block 1, i.e. the connecting rod 2 can be either spherical or rod-shaped at the hinged end of the distal support block 1.

As shown in fig. 16, in order to reduce the overall thickness as much as possible, the included angle between the connecting rod 2 and the distal support block 1 should be adjusted as small as possible, however, if the included angle is too small, the pushing sleeve 7 cannot be pushed into the included angle when moving forward to the distal support block 1, so that the distal support block 1 cannot be jacked up, for this reason, a hole may be provided below the hinge joint of the distal support block 1 and the connecting rod 2, a front threading is put in, the distal support block 1 is rotated by pulling a wire to increase the included angle with the connecting rod 2 during surgery, and the pushing sleeve 7 is operated to move forward when the included angle is large enough to allow the end of the pushing sleeve 7 to be pushed in.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Claims

1. an intervertebral cage, is characterized in that, comprises:

A distal support block (1) and a proximal support block (3), the distal support block (1) and the proximal support block (3) are used to be relatively arranged on the endplates of two adjacent vertebral bodies between;

A connecting rod (2), one end of the connecting rod (2) is fixedly connected with the middle of the distal support block (1), and the other end of the connecting rod (2) is connected with the proximal support block (3) Detachable connection;

A distal auxiliary support member (8), the distal auxiliary support member (8) includes two hinged support rods (82), the two support rods (82) are hinged in the middle, and the two support rods (82) Auxiliary support blocks (81) are provided at the first ends of the two support rods (82), the second ends of the two support rods (82) can both be relatively fixed with the connecting rod (2), and the two support rods (82) When the second ends of the two support rods (82) are relatively fixed with the auxiliary support blocks (81) at the first ends of the two support rods (82), they are relatively fixed.

2. The intervertebral cage according to claim 1, wherein the second ends of the two support rods (82) are provided with a cuff plate (83) with a groove, and the two support rods (82) The hoop plate (83) of 82) can jointly hold the connecting rod (2).

3. The intervertebral cage according to claim 2, wherein the first end of the connecting rod (2) is connected with the distal support block (1) and the second end is connected with the proximal support The blocks (3) are connected, and the diameter of the connecting rod (2) gradually increases from the second end to the first end;

After the connecting rod (2) is inserted between the hoop plates (83) of the two support rods (82), the hoop plates (83) of the two support rods (82) are moved along the connecting rod (2) The direction of the second end to the first end is gradually moved so that the hoop plates (83) of the two support rods (82) are gradually moved away from each other and the auxiliary support blocks (81) of the two support rods (82) are opposite to each other. keep away.

4. The intervertebral cage according to claim 3, characterized in that it further comprises a blocking member for preventing the hoops (83) of the two support rods (82) from being separated by the connecting rods (2) move in the direction from the first end to the second end;

The blocking member comprises a blocking ring (10) sleeved on the connecting rod (2), a blocking protrusion (101) is provided on the inner wall of the blocking ring (10), and a blocking protrusion (101) is provided on the connecting rod (2) A blocking groove (21) matched with the blocking protrusion (101) is provided.

5. The intervertebral cage according to claim 4, wherein the blocking groove (21) comprises a first segment and a second segment connected in sequence, and the first segment is along the connecting rod (2) The second section extends along the circumferential direction of the connecting rod (2); the blocking protrusion (101) slides along the first section of the blocking groove (21) to its end and then rotates to into the second section of the blocking groove (21).

6. The intervertebral cage according to claim 5, wherein the blocking member further comprises blocking teeth (11) fixedly connected with the outer wall of the blocking ring (10), and the blocking protrusions ( 101) When rotating along the second segment of the blocking groove (21), it can be rotated until the blocking teeth (11) protrude into the bone groove of the vertebral body.

7. The intervertebral cage according to claim 2, characterized in that, one end of the two hoops (83) facing away from the support rod (82) is concave-convex fit; or,

There are serrations, and the serrations of the two hoop plates (83) can be engaged with each other.

8. The intervertebral cage according to claim 1, characterized in that it further comprises a locking nut (4), and the end of the connecting rod (2) connected with the proximal support block (3) is provided with a locking nut (4) for A thread matched with the locking nut (4); a through hole for the end of the connecting rod (2) to pass through is formed in the middle of the proximal support block (3), and the locking nut (4) is located on the side of the proximal support block (3) away from the distal support block (1), and is used to fasten the connection between the proximal support block (3) and the connecting rod (2);

The through hole of the proximal support block (3) is a non-circular hole, and the part of the connecting rod (2) that matches the non-circular hole is non-circular.

9. The cage according to claim 1, wherein the distal support block (1), the proximal support block (3) and/or the auxiliary support block (81) are used for connecting with the bone surface The contact position is provided with a pad groove (1a);

It also includes a flexible pad (9) arranged in the pad groove (1a), and the flexible pad (9) is used for contacting with the bone surface.

10. The cage according to claim 1, further comprising a locking nut (4) and an advancing sleeve (7), the distal support block (1) and the proximal support block ( 3) It is used to be relatively arranged between the endplate edges of two adjacent vertebral bodies; one end of the connecting rod (2) is hinged with the middle of the distal support block (1), and the other end is provided with a the thread to which the locking nut (4) is matched; the push sleeve (7) is sleeved on the connecting rod (2) and is threadedly connected with the connecting rod (2), and the push sleeve (7) It is used for pressing the distal support block (1) to rotate relative to the connecting rod (2); the middle part of the proximal support block (3) is provided with an end for the connecting rod (2) The through hole through which the part passes through, the locking nut (4) is located on the side of the proximal support block (3) away from the distal support block (1), and is used to attach the proximal support block (3) It is tightly connected with the connecting rod (2).