WO2012130140A1

WO2012130140A1 - Interspinous dynamic stabilization device

Info

Publication number: WO2012130140A1
Application number: PCT/CN2012/073195
Authority: WO
Inventors: 李雷; 田芳; 冯勇; 刘道志
Original assignee: 上海微创骨科医疗科技有限公司
Priority date: 2011-03-28
Filing date: 2012-03-28
Publication date: 2012-10-04
Also published as: CN102697544A

Abstract

An interspinous dynamic stabilization device, comprising: a main structure (1), a first fastener (2) and a second fastener (3); the main structure (1) consists of two symmetrical M-shaped elastic folded boards (11, 12) with respective openings opposite to each other; the first fastener (2) consists of one pair of oppositely fastened plates (21, 22) fixed on one side of the two M-shaped elastic folded boards (11, 12) of the main structure (1) and is perpendicular to the direction of the openings of the M-shaped elastic folded boards (11, 12); the second fastener (3) consists of another pair of oppositely fastened plates (31, 32) fixed on another side of the two M-shaped elastic folded boards (11, 12) of the main structure (1), and is perpendicular to the direction of the openings of the M-shaped elastic folded boards(11, 12). The main structure (1) consisting of the two symmetrical M-shaped elastic folded boards (11, 12) with respective openings opposite to each other provides polyline-variation flexibility performance, able to maintain normal spine movement and restrict excessive spine movement. In other words, normal spine movement is maintained in the high-slope range and excessive spine movement is restricted in a low-slope range.

Description

The present invention claims the priority of the Chinese patent application filed on March 28, 2011, the Chinese Patent Office, the application No. 2011100759121.1, the invention name is "the interspinous dynamic stabilization device", the entire contents of which are incorporated by reference. Combined in this application. TECHNICAL FIELD The present invention relates to the field of spine orthopedic implants, and more particularly to an interspinous dynamic stabilization device. Background technique

When the push disc is degenerated or the joint is slipped or degenerated, the height of the push is lost, and the rear structure is unstable, which leads to the narrowing of the push hole and the push hole, and the narrowness will press the spinal nerve or nerve root, resulting in the patient. Symptoms such as waist and leg pain and numbness seriously affect the quality of life of patients.

In solving this problem, the known method is conservative treatment of medicine. This method is designed to control conditions such as pain, numbness, etc., rather than correcting to solve the problem. For some patients, long-term treatment is required, which means that long-term use of painkillers may cause the patient's mental state or other adverse side effects.

Another known method is inter-fusion fusion or interspinous fusion, which maintains the height of the push and reduces the stress on the nerve structure. When performing a push-to-push fusion or interspinous fusion procedure, a cage, a variety of plate-like devices, and a push-bone screw system can be used for fixation. However, the relative fixation of the segments caused by the fusion causes the stress to concentrate on the adjacent pushers, especially the load of the adjacent pushers; at the same time, the loss of the mobility of the merged segments leads to an increase in the range of motion of the adjacent segments. In order to compensate for the activity of the fusion segment, the biomechanical environment of the adjacent segment is abnormal, and the change of the biomechanical environment eventually leads to the degeneration of the adjacent segment.

Therefore, spine surgeons and researchers have begun to study more advanced surgical techniques and spinal stabilization devices to treat degenerative or articular degeneration. Recently, there have been a variety of interspinous dynamic stabilization devices that can be implanted between two or more adjacent spinous processes to relieve stress and prevent exacerbations. However, the performance of these devices in maintaining normal spinal activity and preventing excessive spinal motion is still far from the requirements of surgery. Summary of the invention In view of this, the present invention provides a novel dynamic stabilization device for interspinous processes, which can better maintain the normal mobility of the spine and prevent excessive movement of the spine. The technical solution is as follows:

An interspinous dynamic stabilization device includes: a main body structure, a first fixing member and a second fixing member, wherein:

The main body structure is composed of two opposite-shaped and symmetric M-shaped elastic folded-back plates;

The first fixing member is composed of a pair of opposite fixing plates, and is fixed to one side of the two M-shaped elastic folding boards of the main body structure, and is perpendicular to the opening direction of the M-shaped elastic folding board;

The second fixing member is composed of another pair of opposite fixing plates, and is fixed on the other side of the two M-shaped elastic folding boards of the main body structure, and is perpendicular to the opening direction of the M-shaped elastic folding board.

Preferably, in the interspinous dynamic stabilization device, the first fixing member and the second fixing member are symmetrical.

Preferably, the pair of fixing plates of the first fixing member have a symmetrical structure; and/or the pair of fixing plates of the second fixing member have a symmetrical structure.

Preferably, in the interspinous dynamic stabilization device, the inflection point of the M-type elastic folding plate is a circular arc transition structure.

Preferably, in the interspinous dynamic stabilization device, the arc transition structure of the intermediate inflection point of the M-type elastic folded-back plate, and/or the arc-transition structure of the inflection points at both ends are in the C-type.

Preferably, in the interspinous dynamic stabilization device, the inner wall of the fixing plate of the first fixing member and the second fixing member is provided with ratchet teeth.

Preferably, in the interspinous dynamic stabilization device, the inner wall of the fixing plate of the first fixing member is provided with ratchet teeth, and the fixing plate of the second fixing member is provided with a through hole.

Preferably, in the interspinous dynamic stabilization device, the fixing plate of the first fixing member and the second fixing member is provided with a through hole.

Preferably, in the interspinous dynamic stabilization device, the interspinous dynamic stabilization device is entirely made of an alloy material.

Preferably, in the interspinous dynamic stabilization device, the interspinous dynamic stabilization device is entirely made of a polymer or a composite material.

As can be seen from the above technical solution, the present invention provides a linear change in elastic properties of the device by using a main body structure composed of two oppositely-shaped and symmetric M-shaped elastic folding plates. The varying elastic properties maintain the normal mobility of the spine and limit the excessive movement of the spine, ie, the normal activity of the spine can be preserved in the large slope region, and the excessive movement of the spine can be restricted in the low slope region; The elastic foldback plate structure adjusts the elastic curve of the elastic structure by the thickness and/or width of any one of the inflection points, and is suitable for various complicated spinal surgery applications. 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 embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description It is only some embodiments described in the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

1 is a front view of an interspinous process dynamic stabilization device according to an embodiment of the present invention; FIG. 2 is a front view of another interspinous process dynamic stabilization device according to an embodiment of the present invention; A front view of another interspinous dynamic stabilization device is provided; FIG. 4 is a front view of another interspinous process dynamic stabilization device according to an embodiment of the present invention; FIG. 5 is another spine according to an embodiment of the present invention. Schematic diagram of the three-dimensional structure of the interspinning dynamic stabilization device;

6 is a schematic perspective view of another interspinous process dynamic stabilization device according to an embodiment of the present invention;

FIG. 7 is a schematic perspective structural view of another interspinous process dynamic stabilization device according to an embodiment of the present invention; FIG.

FIG. 8 is a schematic diagram of the interspinous process dynamic stabilization device and the spinous process according to an embodiment of the present invention. detailed description

In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of the present invention.

As shown in FIG. 1 , the interspinous dynamic stabilization device provided by the embodiment of the present invention includes: a main body structure 1 , a first fixing member 2 and a second fixing member 3 , wherein the main body structure 1 is opposite by two openings The symmetrical M-shaped elastic folded-back plates 11 and 12 are formed; the first fixing member 2 is composed of a pair of opposite fixing plates 21 and 22, and is fixed to one of the two M-shaped elastic folding plates 11 and 12 of the main body structure 1. Side, and perpendicular to the opening direction of the M-type elastic folded-back plates 11 and 12; the second fixing member 3 is composed of another pair of opposite fixing plates 31 and 32, and is fixed to the main body structure 1 The other side of the elastic folding plates 11 and 12 is perpendicular to the opening direction of the M-shaped elastic folding plates 11 and 12.

It should be noted that, in practical applications, preferably, the first fixing member 2 and the second fixing member 3 have a symmetrical structure; the fixing plates 21 and 22 of the first fixing member 2 have a symmetrical structure; Or, the fixing plates 31 and 32 of the second fixing member 3 are also in a symmetrical structure.

Referring to Fig. 2, in other embodiments, the inflection points of the M-type elastic folding plates 11 and 12 are circular arc transition structures.

Preferably, the arc-transition structure of the intermediate inflection point of the M-type elastic folded-back plates 11 and 12, and/or the arc-transition structure of the inflection points at both ends are C-shaped concave. 2 shows a case where the intermediate inflection point is a C-shaped concave; and FIG. 3 shows a case where all three inflection points are C-shaped concave.

It should be noted that when the inflection points of the M-type elastic folding plates 11 and 12 have a C-shaped concave shape, the radial extending portion from the end of the circular arc can be self-contacted after being pressed, forming a lever function, thereby providing better provision. Compressive elastic properties.

Referring to Fig. 4, in other embodiments, the inner wall of the fixing plate of the first fixing member 2 and the second fixing member 3 is provided with ratchet teeth 4. This fixed plate structure can compensate for the loss of interspinous ligament and compensate for the stability of the ligament.

Referring to FIG. 5, in other embodiments, the inner walls of the fixing plates 21 and 22 of the first fixing member 2 are provided with ratchet teeth 4, and the fixing plates 31 and 32 of the second fixing member 3 are provided with Through the hole 5. The fixed plate structure can be applied to the dynamic fixation of the lumbosacral spine, and can solve the unfixed condition caused by the small spinous process of the ankle.

Referring to Fig. 6, in other embodiments, the fixing plates of the first fixing member 2 and the second fixing member 3 are provided with through holes 5. This fixed plate structure can be used in conjunction with the pusher and nail device to fix in the case of a spinous process defect.

It should be noted that in the irregular surgery of the spinous process, it is necessary to select a special shape of the interspinous process. The dynamic stabilization device, as shown in Fig. 7, illustrates an asymmetrical interspinous dynamic stabilization device of the first fixation member and the second fixation member. In practical applications, an adaptive stabilization device between the spinous processes can be selected according to the specific conditions of the spinal surgery.

In addition, it should be noted that the interspinous dynamic stabilization device may be made of an alloy material such as a titanium alloy or a cobalt-based alloy; or a polyether ether ketone, a carbon fiber reinforced polyether ether ketone, or an ultrahigh molecular weight polyethylene or the like may be used. Composite material.

FIG. 8 is a view showing the interspinous dynamic stabilization device provided by the present invention and the spinous process. Compared with the existing interspinous dynamic stabilization device, the interspinous process dynamic stabilization device provided by the embodiment of the present invention is adopted by The main structure of the two-shaped opposite and symmetrical M-shaped elastic fold-back plate provides the device with linear elastic properties. The linear elastic property can maintain the normal movement of the spine and limit the excessive movement of the spine. In the large slope area, the normal activity of the spine can be preserved, and in the low slope area, the excessive movement of the spine can be restricted; in addition, the thickness and/or width of any one of the inflection points of the M-type elastic folded-back plate structure can be adjusted to adjust the elastic structure. Elastic curve for a variety of complex spinal surgery applications.

In addition, the various fixed plate structures provided by the embodiments of the present invention can make the interspinous dynamic stabilization device suitable for various complicated spinal surgery situations.

The above description is only a preferred embodiment of the present invention, and those skilled in the art can understand or implement the present invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but the scope of the invention is to be accorded

Claims

Rights request

What is claimed is: 1. An interspinous dynamic stabilization device, comprising: a main body structure, a first fixing member and a second fixing member, wherein:

2. The interspinous dynamic stabilization device according to claim 1, wherein the first fixing member and the second fixing member are symmetrical.

The interspinous dynamic stabilization device according to claim 2, wherein a pair of fixing plates of the first fixing member are symmetrically arranged; and/or a pair of fixing plates of the second fixing member Into a symmetrical structure.

4. The interspinous dynamic stabilization device according to claim 1, wherein the inflection point of the M-shaped elastic folded-back plate is a circular arc transition structure.

The interspinous dynamic stabilization device according to claim 4, wherein the arc transition structure of the intermediate inflection point of the M-type elastic folded-back plate, and/or the arc-transition structure of the inflection points at both ends is a C-type Concave.

The interspinous dynamic stabilization device according to any one of claims 1 to 5, characterized in that the inner wall of the fixing plate of the first fixing member and the second fixing member is provided with ratchet teeth.

The interspinous dynamic stabilization device according to any one of claims 1 to 5, wherein the inner wall of the fixing plate of the first fixing member is provided with ratchet teeth, and the fixing of the second fixing member is A through hole is provided in the plate.

The interspinous dynamic stabilization device according to any one of claims 1 to 5, characterized in that the fixing plates of the first fixing member and the second fixing member are provided with through holes.

The interspinous process dynamic stabilization device according to any one of claims 1 to 5, wherein the interspinous process dynamic stabilization device is entirely made of an alloy material. The interspinous process dynamic stabilization device according to any one of claims 1 to 5, characterized in that