CN112741717A

CN112741717A - Adjustable fusion cage and spreader

Info

Publication number: CN112741717A
Application number: CN202110044113.1A
Authority: CN
Inventors: 聂文忠; 李晓萱; 刘梦宇; 陆建民; 曾嘉艺; 周留洋
Original assignee: Shanghai Institute of Technology
Current assignee: Shanghai Institute of Technology
Priority date: 2021-01-13
Filing date: 2021-01-13
Publication date: 2021-05-04

Abstract

The invention discloses an adjustable fusion cage and a spreader. The adjustable distractor includes an upper plate and a lower plate. The upper plate and the lower plate are provided with through holes, the upper surface of the upper plate and the lower surface of the lower plate are provided with a plurality of teeth side by side along the length direction of the upper plate or the lower plate on two sides corresponding to the through holes, and a first spreading block, a second spreading block and four rotating blocks are arranged between the upper plate and the lower plate. Two ends of the first spreading block and the second spreading block are respectively and rotatably connected with first ends of the two rotating blocks, and second ends of the four rotating blocks are respectively and rotatably connected with two ends of the upper plate and the lower plate along the length direction; the first spreader block is provided with an operating part which is used for matching with an external spreader to adjust the distance between the upper plate and the lower plate. The distractor includes an outer tube and a push rod. The push rod penetrates through the outer tube, and the push rod is not connected with the outer tube or connected with the outer tube in a sliding mode. One end of the outer tube is provided with an external thread matched with the thread through hole, and one end of the push rod extends out of the outer tube and is provided with a handle.

Description

Adjustable fusion cage and spreader

Technical Field

The invention belongs to the field of medical instruments, and particularly relates to an adjustable fusion cage and a distractor.

Background

Lumbar degenerative spondylolisthesis, segmental instability, intervertebral disc-derived diseases, lower lumbago caused by lumbar instability due to traumatic spondylolisthesis, and dyskinesia of limbs, lumbar vertebra fixation and fusion are generally needed for patients who are not treated by non-operation, and fusion devices are increasingly used for lumbar vertebra fixation and fusion.

The fusion cage is positioned between the vertebral bodies and serves as nucleus pulposus, the height of the fusion cage needs to be basically consistent with that of the intervertebral space, and bone cement needs to be injected between the vertebral bodies for fusion after the fusion cage is implanted.

Most of the present fusion devices are fixed and cannot adjust the height, so that the needed surgical incision is large, the injury to the spine is also large, and the fusion rate of one hundred percent cannot be realized for patients with different intervertebral heights.

Disclosure of Invention

The invention aims to provide an adjustable fusion cage and a spreader, and aims to solve the problem that the height of the fusion cage in the prior art cannot be adjusted in a fixed mode.

The technical scheme of the invention is as follows:

an adjustable fusion cage comprising:

the upper plate and the lower plate are respectively provided with a through hole, a plurality of teeth are arranged on the two sides of the upper surface of the upper plate and the lower surface of the lower plate, which correspond to the through holes, side by side along the length direction of the upper plate or the lower plate, and a first spreading block, a second spreading block and four rotating blocks are arranged between the upper plate and the lower plate;

the two ends of the first spreading block and the second spreading block are respectively and rotatably connected with the first ends of the two rotating blocks, and the second ends of the four rotating blocks are respectively and rotatably connected with the two ends of the upper plate and the two ends of the lower plate along the length direction; and the first spreader block is provided with an operating part which is used for matching with an external spreader to adjust the distance between the upper plate and the lower plate.

Preferably, in the adjustable fusion cage according to an embodiment of the present invention, the upper plate, the lower plate, the rotating block, the first distraction block, and the second distraction block are rotatably connected to each other through a rotating shaft.

Preferably, in the adjustable fusion cage according to an embodiment of the present invention, the upper plate and the lower plate are respectively provided with a protrusion for rotational connection at a rotational connection position with the rotating block, and the protrusion, the rotating block, the first spreading block and the second spreading block are respectively provided with a rotating shaft hole for a rotating shaft to pass through at the rotational connection position thereof.

Preferably, in the adjustable fusion cage according to an embodiment of the present invention, the rotation shaft hole and the corresponding rotation shaft are in transition fit.

Preferably, in the adjustable fusion cage according to an embodiment of the present invention, the teeth are triangular teeth having a bottom connected to the upper plate or the lower plate, and a vertex angle of the triangular teeth is a rounded angle.

Preferably, the adjustable fusion cage provided by an embodiment of the invention has an up-and-down symmetrical structure.

Preferably, in the adjustable fusion cage according to an embodiment of the present invention, the operating portion is a threaded hole provided on the first distraction block.

Preferably, in the adjustable fusion cage according to an embodiment of the present invention, the threaded hole is a threaded through hole, and an axial direction of the threaded through hole is parallel to a length direction of the upper plate.

A distractor for adjusting the distance between the upper plate and the lower plate of the adjustable fusion cage of claim 8, comprising an outer tube and a push rod;

the push rod penetrates through the outer tube, and the push rod is not connected with the outer tube or connected with the outer tube in a sliding mode; one end of the outer tube is provided with an external thread matching the threaded through hole in the adjustable fusion cage according to claim 8.

Preferably, in the spreader provided by an embodiment of the present invention, an end of the push rod away from the external thread extends out of the outer tube and is provided with a handle.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:

according to the adjustable fusion cage provided by the invention, the upper plate, the lower plate, the rotating block, the first opening block and the second opening block are rotatably connected, the first opening block is pulled by the operating part, the angle between the components of the adjustable fusion cage and the overall height of the adjustable fusion cage can be randomly adjusted, the adjustable fusion cage can be implanted through a small incision during implantation, and the height of the adjustable fusion cage can be adjusted to the height matched with the height of the annularly arranged intervertebral through the opening block provided by the invention after implantation, so that the problem that the height of the fusion cage cannot be adjusted in a fixed mode in the prior art is solved. Meanwhile, the invention has small trauma to the vertebral body, light pain of the wound after operation and quick recovery, thereby improving the fusion rate.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.

FIG. 1 is a schematic view of an adjustable fusion cage according to the present invention;

FIG. 2 is a schematic diagram of an adjustable cage according to the present invention after being expanded;

FIG. 3 is a schematic structural view of an upper plate according to the present invention;

FIG. 4 is a schematic structural view of a first spreader block of the present invention;

FIG. 5 is a schematic view of a rotary block according to the present invention;

fig. 6 is a schematic structural view of a distractor according to the present invention.

Description of reference numerals:

1: an upper plate; 2: a lower plate; 3: rotating the block; 4: a first spreader block; 5: a second spreader block; 6: a rotating shaft hole; 7: a threaded through hole; 8: teeth; 9: a rotating shaft; 10: a protrusion; 11: an outer tube; 12: a push rod; 13: an external thread; 14: a handle.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.

For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".

Example 1

Referring to fig. 1 to 5, the present embodiment provides an adjustable fusion cage including an upper plate 1, a lower plate 2, four rotation blocks 3, a first distraction block 4, and a second distraction block 5. Upper plate 1 and hypoplastron 2 all are equipped with the through-hole, and the upper surface of upper plate 1 and the lower surface of hypoplastron 2 all are equipped with a plurality of teeth 8 along upper plate 1 or hypoplastron 2 length direction side by side in the both sides that correspond the through-hole, are equipped with first piece 4, the second piece 5 and four rotatory pieces 3 of strutting between upper plate 1 and the hypoplastron 2.

Two ends of the first spreading block 4 and the second spreading block 5 are respectively and rotatably connected with first ends of the two rotating blocks 3, and second ends of the four rotating blocks 3 are respectively and rotatably connected with two ends of the upper plate 1 and the lower plate 2 along the length direction; the first spreader 4 is provided with an operating part for adjusting the distance between the upper plate 1 and the lower plate 2 in cooperation with an external spreader.

Because the upper plate 1, the lower plate 2, the rotating block 3, the first opening block 4 and the second opening block 5 are rotatably connected, the angle between the parts of the adjustable fusion device and the whole height of the adjustable fusion device can be adjusted at will by pulling the first opening block 4 through the operating part, and therefore, the fusion device can be implanted through a small incision when being implanted, and the operation wound is reduced. Meanwhile, the height of the adjustable fusion cage can be adjusted to the height matched with the height of the annularly arranged intervertebral after the fusion cage is implanted, so that the injury to the vertebral body is small, the postoperative wound is low in pain and quick to recover, and the fusion rate is improved.

The structure of the present embodiment will now be explained.

The upper plate 1, the lower plate 2, the rotating block 3, the first spreading block 4 and the second spreading block 5 can be connected in a rotating manner through hinges of a rotating shaft 9. Specifically, the upper plate 1 and the lower plate 2 are respectively provided with a protrusion 10 for rotational connection at a rotational connection with the rotary block 3, and the protrusion 10, the rotary block 3, the first spreading block 4 and the second spreading block 5 are respectively provided with a rotary shaft hole 6 for penetration of the rotary shaft 9 at rotational connections thereof. Transition fit is adopted between the rotating shaft hole 6 and the corresponding rotating shaft 9. Because two adjacent parts all connect through rotation axis 9, and adopt transition fit between axle and the hole, the friction between hole and the axle is great, and adjustable fusion ware can briefly keep adjustable fusion ware fixed after the height of adjustable fusion ware is adjusted, also can play the fixed action of short time when can rotate.

The operating portion may be a threaded hole provided on the first spreader block 4. Specifically, the screw hole may be a screw through hole 7, and an axial direction of the screw through hole 7 is parallel to a length direction of the upper plate 1.

The teeth 8 can be triangular teeth with the bottom edges connected with the upper plate 1 or the lower plate 2, and the vertex angles of the triangular teeth are rounded. The upper plate 1 and the lower plate 2 are mirror-symmetrical, and the whole adjustable fusion cage can be of an up-and-down symmetrical structure.

The adjustable fusion cage provided by the present embodiment may be made of nitinol. The nickel-titanium memory alloy has the advantages of superelasticity, wear resistance, corrosion resistance, good biocompatibility and the like, and is widely applied to the field of medical treatment.

The upper surface of the upper plate 1 and the lower surface of the lower plate 2 are provided with sawtooth-shaped teeth, the teeth 8 are triangular, and the top ends of the teeth are provided with round corners. The tooth 8 can increase the contact area between the adjustable fusion cage and the end plate, and the larger the bone implantation amount is, the stability between the vertebral bodies can be improved, the subsidence can be prevented, and the fusion rate can be increased. A through hole is arranged on a protrusion 10 below the upper plate 1, a rotating shaft 9 is arranged in the through hole, and then the through hole is connected with the rotating block 3 to form a hinge connection; is characterized in that the adjustable fusion cage can bring a buffer function when being propped open, and the pressure to the vertebral body end plate when being propped open is reduced to the maximum extent.

Example 2

Referring to fig. 6, the present embodiment provides a distractor for adjusting the distance between the upper plate 1 and the lower plate 2 of the adjustable fusion cage of embodiment 1, comprising an outer tube 11 and a push rod 12.

The push rod 12 penetrates through the outer tube 11, and the push rod 12 is not connected with or connected with the outer tube 11 in a sliding mode. One end of the outer tube 11 is provided with an external thread 13 matched with the thread through hole 7 in the adjustable fusion device, and one end of the push rod 12 far away from the external thread 13 extends out of the outer tube 11 and is provided with a handle 14.

When the device is used, the external thread 13 on the outer tube 11 is connected with the thread through hole 7 on the first spreader 4, and the push rod 12 penetrates through the outer tube 11 and then abuts against the second spreader. The outer tube 11 can pull the first distraction block 4 towards the direction of an operator, and the push rod 12 can push the second distraction block 5 towards the direction away from the operator, so that the adjustable fusion cage is distracted. When the adjustable cage reaches a proper height, the push rod 12 is removed and bone cement is injected between the vertebral bodies through the outer tube 11. Finally, the outer tube 11 is removed, and the adjustable fusion cage and bone cement are fixed together to play a supporting role.

The spreader of this embodiment, convenient operation, outer tube 11 part need not to take out simultaneously can directly pour into bone cement into.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.

Claims

1. An adjustable fusion cage, comprising:

2. The adjustable fusion device of claim 1 wherein the upper plate, the lower plate, the rotation block, the first distraction block, and the second distraction block are all rotationally coupled by a rotation shaft.

3. The adjustable fusion cage according to claim 2, wherein the upper plate and the lower plate are respectively provided with a protrusion for rotational connection at a rotational connection with the rotation block, and the protrusion, the rotation block, the first spreading block and the second spreading block are respectively provided with a rotation shaft hole for penetration of a rotation shaft at a rotational connection thereof.

4. The adjustable fusion cage of claim 3 wherein the pivot bores and the corresponding pivot shafts are transition fit.

5. The adjustable fusion cage of claim 1 wherein the teeth are triangular teeth having a base connected to the upper plate or the lower plate, the apex of the triangular teeth being rounded.

6. The adjustable fusion cage of claim 1 in an up-down symmetrical configuration.

7. The adjustable fusion device of any one of claims 1 to 6 wherein the operating portion is a threaded hole provided on the first distraction block.

8. The adjustable fusion cage of claim 7 wherein the threaded bore is a threaded through bore and the axial direction of the threaded through bore is parallel to the length direction of the upper plate.

9. A distractor for adjusting the distance between the upper and lower plates of the adjustable fusion cage of claim 8, comprising an outer tube and a push rod;

10. The distractor of claim 9 wherein an end of the push rod distal to the external threads extends out of the outer tube and is provided with a handle.