WO2014176953A1

WO2014176953A1 - Inter-posterior spine distraction implant unit

Info

Publication number: WO2014176953A1
Application number: PCT/CN2014/074439
Authority: WO
Inventors: 高耀平; 田芳; 林忠; 陈伟
Original assignee: 苏州海欧斯医疗器械有限公司; 上海微创骨科医疗科技有限公司
Priority date: 2013-04-28
Filing date: 2014-03-31
Publication date: 2014-11-06
Also published as: CN104116579A; CN104116579B

Abstract

Disclosed is an inter-posterior spine distraction implant unit (10) for solving problems such as poor stability of inter-spine distraction implant systems and complex surgery in the prior art. The inter-posterior spine distraction implant unit (10), being cylindrical as a whole, has a cavity (101) inside, and comprises: a first segment (1), more than two changeable wings (4), a second section (2), more than two fixed wings (5), and a third section (3) successively in elastic connection. During use, firstly, the changeable wings (4) are closed, and are then inserted between adjacent spinous processes of the spine through the incision (412) of interspinous ligaments, and then the changeable wings (4) are unfolded, and together with the fixed wings (5), snaps the adjacent spinous processes of the spine, playing the role of distracting the inter-spine. The inter-posterior spine distraction implant unit (10) not only has a small incision, but can also be implanted without damaging supraspinous ligaments during use. It reduces the difficulty of the operation, and has a good stability.

Description

Spinal posterior intervertebral distraction implant unit

The present invention relates to the field of medical device technology, and in particular to a posterior spinal intervertebral distraction implant unit. Background technique

When the spinal deformity and intervertebral disc degeneration, the stenosis of the intervertebral foramen and the loss of intervertebral height are caused, and the posterior structure is unstable, which causes compression of the spinal nerves or nerve roots, causing symptoms such as waist and leg pain and numbness of the patient, which seriously affects the quality of life of the patient. The most important methods known to solve this problem are interbody fusion and dynamic fixation, which can maintain the height of the intervertebral space and reduce the pressure on the nerve structure. At present, the nail rod system is mainly used in combination with fusion surgery, pedicle screw and dynamic rod surgery. However, the relative fixation after the fusion surgery causes the stress to concentrate on the adjacent vertebral body, especially the load on the adjacent vertebral body. At the same time, the loss of activity of the fusion segment leads to an increase in the range of motion of adjacent segments to compensate for the activity of the fusion segment, thereby causing abnormalities in the biomechanical environment of adjacent segments. The change in the biomechanical environment ultimately leads to the adjacent segment. The segment is degenerated. Therefore, the intervertebral distraction implantation system is generally used clinically for the surgical treatment of various degrees of lumbar degenerative symptoms. 1 is a schematic illustration of an interspinous distraction implant system in accordance with the prior art. As shown in Fig. 1, the intervertebral distraction implant system 81 (81 1 and 812 in the figure are disassembled components, and 813 is in the assembled state). The locking wing side is locked, and the operation is simple but the stability is poor. The upper ligament is prevented from receding and there may be slippage between the spines. Inserted from the side of the spine 83 shown in block 82 during implantation effectively retains the supraspinous ligament for interspinous expansion. Patent 200810098466.4 discloses a ridge-and-groove spacing stabilizing structure, as shown in Figures 2A and 2B (the reference numerals in Figures 2A and 2B are independent of the other figures). 2A is a schematic illustration of another interspinous implant system in accordance with the prior art, and FIG. 2B is a side elevational view of such an interspinous distraction implant system mounted on the spine. The ridge-protrusion-stabilized structure is inserted into the upper and lower spinous processes through the upper and lower wings, and the upper and lower wings have preset holes. The additional fixation of the spine can be performed according to the doctor's needs. The operation is placed directly above, and the supraspinous ligament is destroyed. Implantation, the supraspinous ligament repair is performed after the implantation is completed. This kind of ridge-segmented stabilizing structure has high stability but needs to destroy the supraspinous ligament or remove the interspinous ligament, which increases the instability of the spine and causes great trauma to the patient. Summary of the invention

In view of the above, the present invention provides a spinal posterior intervertebral distraction implant unit, which uses the posterior spinal intertrochanteric distraction implant unit to not only have a small incision, but also can be implanted without destroying the supraspinous ligament. The operation time is shortened, the operation difficulty is reduced, and the stability is good. To achieve the above object, the present invention provides a posterior spinal intervertebral distraction implant unit. The posterior spinal interspinous distraction implant unit of the present invention has a cavity inside and has a cylindrical shape as a whole, and includes a first segment that is elastically connected in sequence, two or more variable wings, a second segment, and two or more fixed wings. a third segment; the first end of the first segment has a connection structure for connecting a rod-shaped tool extending from the free end of the third segment into the cavity; the variation wing includes a front section that is elastically connected in sequence , the middle segment, and the rear segment, when the first segment and the second segment are relatively moved, the varying wing is bent to integrally protrude toward the outer side of the spinal posterior intervertebral implant unit; The whole wing protrudes toward the outer side of the spinal posterior ridge interplanting unit; the adjacent ones of the varying wings have a certain interval between the adjacent fixed wings. Optionally, the middle portion of the variable wing has a V or U shape and the opening is open to the inside of the implant unit along the ridge of the posterior ridge of the spine, and the turning point when the variable wing is bent is The bottom of the V or U shape of the middle section. Optionally, the fixed wing is generally V-shaped or U-shaped, and the opening extends the interior of the implant unit toward the posterior ridge of the spine. Optionally, the variable wing and the fixed wing are each two. Optionally, each of the variable wing and the fixed wing is four, distributed on the two intersecting diameters of the cross section of the posterior ridge of the spine to expand the implant unit, and the angle between the two intersecting diameters The range is [25°, 55°]. Optionally, the connecting structure is a hole with an internal thread or a protrusion fixed inside the first end of the first segment. Optionally, the first segment and/or the second segment have tongue-like projections extending along the cylindrical surface between the varying wings. Optionally, the second segment and/or the third segment have tongue-like projections extending along the cylindrical surface between the fixed wings. Optionally, the third segment has an enlarged diameter near the free end. Optionally, one or more holes are formed in the cylindrical surface adjacent the free end of the third segment. Optionally, the first end of the first segment has a reduced diameter near the first end. Optionally, the varying wing and/or the fixed wing is in the form of a strip having a certain width. According to the technical solution of the present invention, the posterior ridge of the spine is used to open the cylindrical shape of the implant unit The body has a variable wing that can be opened and closed, the structure is simple and reliable, the cost is low, and the stability of the implant is good; the operation difficulty is reduced, not only the incision is small, but the implant can be inserted without destroying the supraspinous ligament Into the object, shortening the operation time, reducing the difficulty of surgery, suitable for minimally invasive surgery, the patient has less trauma and quick recovery. DRAWINGS

The drawings are intended to provide a better understanding of the invention and are not intended to limit the invention. 1 is a schematic view of an interspinous implant system according to the prior art; FIG. 2A is a schematic view of another intervertebral distraction implant system according to the prior art, and FIG. 2B is such a A schematic view of the side of the intervertebral distraction implant system mounted on the spine;

3 is a schematic illustration of a posterior spinal interspinous implant unit in accordance with an embodiment of the present invention;

4A through 4D are schematic views of an implantation process of an implant unit according to an embodiment of the present invention;

Figure 5 is a schematic illustration of another planting unit in accordance with an embodiment of the present invention;

6 is a schematic illustration of yet another implant unit in accordance with an embodiment of the present invention. detailed description

The exemplary embodiments of the present invention are described with reference to the accompanying drawings, in which, Therefore, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness. 3 is a schematic view of a posterior spinal intervertebral distraction implant unit (hereinafter simply referred to as an "implant unit") according to an embodiment of the present invention. As shown in FIG. 3, the implant unit 10 has a cylindrical shape as a whole and has a cavity 101 therein. The implant unit 10 is divided into three sections, and between the first section 1 and the second section 2 is connected by a plurality of varying wings 4 (three can be seen in the viewing angle in the figure), and between the second segment 2 and the third segment 3 It is connected by a plurality of fixed wings 5 (three can be seen in the view). There is a certain interval between adjacent variable wings 4 and between adjacent fixed wings 5. The first end 11 of the first segment 1 has a connecting structure 111 for connecting a rod-like tool that projects into the cavity 101 from the free end 31 of the third segment (i.e., the end that is not connected to the fixed wing 5). The varying wing 4 includes a front section 41, a middle section 42, and a rear section 43 that are connected in series, the middle section 42 being curved, for example, may be V or U-shaped and having an opening toward the inside of the implant unit 10. The portions of the front section 41 and the rear section 43 which are respectively connected to the first section 1 and the second section 2 have elasticity, so that when the above-mentioned rod-shaped tool is connected to the connecting structure 111 and is drawn outward (in the direction indicated by the arrow A in the figure), When the third segment 3 is fixed, the first segment 1 and the second segment 2 can move relative to each other. At this time, since the variable wing 4 is bendable, the variable wing 4 can be turned at the portion where the segment 42 is bent. The bending is performed. For example, the middle portion 42 shown in FIG. 3 has a V-shape. At this time, the variable wing 4 is integrally bent at the bottom portion 421 of the middle portion 42 as a turning point, so that the variable wing 4 is entirely V-shaped and implanted. The outer side of the unit 10 protrudes with the opening facing the inner side of the implant unit 10. The fixed wing 5 is a member that protrudes integrally toward the outside of the implant unit 10. The specific form may be similar to the shape when the variable wing 4 is integrally bent, that is, the whole is V or U-shaped and the opening faces the inside of the implant unit 10. In the implant unit 10 shown in Fig. 3, the variable wing 4 and the fixed wing 5 are evenly distributed on the circumference, and the variable wing 4 is in a collapsed state, i.e., the entire V or U shape is not formed. Prior to implantation, the implant unit 10 is in the state shown in FIG. The implantation operation of the implant unit of the embodiment of the present invention will be described below with reference to FIG. 3 and FIGS. 4A to 4D. 4A through 4D are schematic views of an implantation process of an implant unit in accordance with an embodiment of the present invention. A side cross-sectional view of a section of the spine is shown in block 401 of Figure 4A. In the implantation procedure, a slit 412 is first cut into the interspinous ligament 411 and then inserted into the implant unit 10, as shown in Figure 4B, and a model of the spine back is shown in block 402 of Figure 4B. Implant unit

The diameter near the first end 11 of 10 can be smaller, thereby forming the shape of the bullet to facilitate insertion. The implant unit 10 is inserted when the fixed wing 5 is caught on one side of the spinous process 413, as shown in block 403 in Fig. 4C. At this time, a rod-shaped tool (not shown) is inserted into the cavity 101 and connected to the connecting structure 111. The connecting structure 111 may specifically be the hole 111 shown in FIG. 3, which has an internal thread, such that the above-mentioned rod-shaped tool has a matching outer end at its end. Thread, after the two are screwed together, the free end 31 of the third segment 3 of the implant unit 10 is clamped by another tool, and the above-mentioned rod-shaped tool is pulled outward, due to the variable wing 4 and the first segment 1. The second segment 2 is an elastic connection, so that the first segment 1 and the second segment are moved relative to each other and the variable wing 4 is pressed to tilt the front segment 41 and the rear segment 43, and the variable wing 4 as a whole becomes V or U. The glyph, i.e., in the shape of the fixed wing 5, is shown as in block 404 of Figure 4D. At this time, the varying wings 4 and the fixed wings 5 sandwich the adjacent spinous processes 413, 414 of the spine, thereby functioning to expand the ridges. The above-mentioned connecting structure 11 1 may also be a protrusion on the inner side of the first end 11 of the first section 1, such that the above-mentioned rod-shaped tool may be a tool capable of hooking or clamping the protrusion, such as a hook or a tweezers. There may be a tongue-like projection between the variable wings 4 and between the fixed wings 5, such as 12, 22, 23, 33, etc. in the figure. Thus, the ends of the tongues can be held against each other when the implant unit 10 is shortened so that the width of the opening held by the varying wings and the fixed wings contributes to the stability of the implant unit 10. The gap between the tongue-like protrusions 23, 33 can have a certain elasticity between the second section 2 and the third section 3, and the second section 2 and the third section 3 can be directly connected, that is, there is no tongue-like convexity in the figure. From the gap between 23, 33, etc. The vicinity of the free end 31 of the third section 3 of the implant unit 10 can have an enlarged diameter to form a tail ring for gripping of the clamp. The implant unit 10 may have one or more holes, such as holes 32, on the cylindrical surface herein for easy attachment to other tools. For variable and fixed wings, there are other alternatives available. They are shown in Figures 5 and 6, respectively. Figure 5 is a schematic illustration of another implanting unit in accordance with an embodiment of the present invention, and Figure 6 is a schematic illustration of yet another implant unit in accordance with an embodiment of the present invention. The implanting unit of Fig. 5 has two variable wings and two fixed wings, which may be distributed at both ends of the two diameters of the section of the implanted unit. The implanting unit of Fig. 6 has four variable wings and four fixed wings, which are distributed on the two intersecting diameters of the cross section of the implanted unit. The angle a of the two intersecting diameters may be in the range of [25 °, 55°]. The varying wings and the fixed wings can be strips of a certain width, which also contributes to the stability of the implant. According to the technical solution of the embodiment of the present invention, the cylindrical body of the posterior spinal intervertebral distraction implant unit has a variable wing that can be opened and closed, the structure is simple and reliable, the cost is low, and the stability of the implant is good. It reduces the difficulty of operation, not only the small incision, but also can insert the implant without destroying the supraspinous ligament, shortening the operation time, reducing the difficulty of surgery, suitable for minimally invasive surgery, and the patient has small trauma and quick recovery. The above specific embodiments do not constitute a limitation of the scope of the present invention. Those skilled in the art will appreciate that a wide variety of modifications, combinations, sub-combinations and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

claims

1. A posterior spinal interspinal distraction implant unit, characterized by:

The posterior spinal intervertebral distraction implant unit has a cavity inside and is cylindrical in shape as a whole, including a first section, two or more variable wings, a second section, two or more fixed wings, and a first section elastically connected in sequence. Three sections;

The first end of the first section has a connecting structure for connecting a rod-shaped tool extending into the cavity from the free end of the third section;

The variable wing includes a front section, a middle section, and a rear section that are elastically connected in sequence. When the first section and the second section move relative to each other, the variable wing bends and the entire body opens toward the posterior spine of the spine. lateral protrusion of the implanted unit;

The fixed wings as a whole protrude toward the outside of the posterior spinal intervertebral distraction implant unit; there is a certain interval between adjacent variable wings and between adjacent fixed wings.

2. The posterior spinal intervertebral distraction implantation unit according to claim 1, wherein the middle section of the variable wing is V or U-shaped and opens toward the posterior spinal intervertebral distraction implantation unit. Inside, the turning point when the variable wing bends is the bottom of the V or U-shape of the middle section.

3. The posterior spinal intervertebral distraction implant unit according to claim 1, characterized in that the fixed wing is V or U-shaped as a whole, and the opening faces the posterior spinal intervertebral distraction implant unit. internal.

4. The posterior spinal intervertebral distraction implant unit according to claim 1, characterized in that there are two variable wings and two fixed wings each.

5. The posterior spinal intervertebral distraction implantation unit according to claim 1, characterized in that each of the variable wings and the fixed wings are four, distributed in the posterior spinal intervertebral distraction implantation unit. On the two intersecting diameters of the cross section, the angle range of the two intersecting diameters is [25. , 55. ].

6. The posterior spinal interspinal distraction implantation unit according to any one of claims 1 to 5, characterized in that the connection structure is a hole with internal threads, or is fixed on the first A protrusion on the inside of the first end of the segment.

7. The posterior spinal intervertebral distraction implantation unit according to any one of claims 1 to 5, characterized in that, the first section and/or the second section have a structure along the cylinder. A tongue-like protrusion extending from the shaped surface is located between the variable wings.

8. The posterior spinal intervertebral distraction implantation unit according to any one of claims 1 to 5, characterized in that, the second section and/or the third section have a structure along the cylinder. A tongue-like protrusion extending from the shaped surface is located between the fixed wings.

9. The posterior spinal intervertebral distraction implantation unit according to any one of claims 1 to 5, characterized in that the third section has an enlarged diameter near its free end.

10. The posterior spinal interspinal distraction implantation unit according to any one of claims 1 to 5, characterized in that there is one or more holes on the cylindrical surface near the free end of the third section .

11. The posterior spinal interspinal distraction implant unit according to any one of claims 1 to 5, characterized in that the first section has a reduced diameter near the first end.

12. The posterior spinal intervertebral distraction implant unit according to any one of claims 1 to 5, characterized in that the variable wings and/or fixed wings are strip-shaped with a certain width.