阅读说明：本技术 一种腰椎分体式并联融合器 (Split type parallel fusion cage for lumbar vertebrae ) 是由 杨小卫 郝定均 于 2021-01-28 设计创作，主要内容包括：本发明属于医疗器械技术领域,公开了一种腰椎分体式并联融合器,包括带槽构件、燕尾构件和锁定螺钉；在带槽构件上开有贯穿前工作面和后工作面的第一植骨窗,在上工作面上开有燕尾槽轨道,燕尾槽轨道在右工作面上处于开口；在燕尾构件上开有贯穿前工作面和后工作面的第二植骨窗,在下工作面上设有用于在燕尾槽轨道内滑动的燕尾,在燕尾的右端面上开有锁定孔；使用时,带槽构件放置在燕尾构件下方,带槽构件和燕尾构件通过锁定螺钉连接。在不损伤神经情况下,经后路或后外侧置入,且具有较大终板支撑面积和植骨空间的融合器；同时可以经单侧置入并提供双侧支撑,兼顾恢复腰椎曲度功能。(The invention belongs to the technical field of medical instruments and discloses a split type parallel fusion cage for lumbar vertebrae, which comprises a grooved component, a dovetail component and a locking screw; a first bone grafting window penetrating through the front working face and the rear working face is formed in the grooved component, a dovetail groove track is formed in the upper working face, and the dovetail groove track is located in an opening in the right working face; a second bone grafting window penetrating through the front working surface and the rear working surface is formed in the dovetail component, a dovetail used for sliding in the dovetail groove track is arranged on the lower working surface, and a locking hole is formed in the right end face of the dovetail; in use, the slotted member is placed under the dovetail member, and the slotted member and the dovetail member are connected by a locking screw. Under the condition of no damage to nerves, the fusion cage is placed through the posterior or posterolateral side and has larger end plate supporting area and bone grafting space; meanwhile, the lumbar vertebra curvature recovery device can be placed in a single side and provide bilateral support, and the lumbar vertebra curvature recovery function is considered.)

1. A lumbar split type parallel fusion cage is characterized by comprising a slotted component (1), a dovetail component (2) and a locking screw (3);

the grooved component (1) comprises a front working surface, a rear working surface, an upper working surface, a lower working surface, a left working surface and a right working surface, wherein a first bone grafting window (11) penetrating through the front working surface and the rear working surface is formed in the grooved component (1), a dovetail groove track (14) is formed in the upper working surface, and the dovetail groove track (14) is positioned on the right working surface and is provided with an opening;

the dovetail component (2) comprises a front working surface, a rear working surface, an upper working surface, a lower working surface, a left working surface and a right working surface, a second bone grafting window (21) penetrating through the front working surface and the rear working surface is formed in the dovetail component (2), a dovetail used for sliding in the dovetail groove rail (14) is arranged on the lower working surface, and a locking hole (26) is formed in the right end surface of the dovetail;

when the dovetail component is used, the trough component (1) is placed below the dovetail component (2), and the trough component (1) and the dovetail component (2) are connected through the locking screw (3).

2. The split parallel lumbar fusion cage according to claim 1, wherein first inverted teeth (13) are provided on the front and rear working surfaces of the slotted member (1), and second inverted teeth (22) are provided on the front and rear working surfaces of the dovetail member (2).

3. The split type parallel fusion cage for lumbar vertebra according to claim 1, wherein a lower through hole (12) communicated with the first bone grafting window (11) is formed on the dovetail groove track (14), the dovetail comprises a plurality of dovetail blocks, an upper through hole (28) communicated with the second bone grafting window (21) is formed on the lower working surface of the dovetail component (2) and between two adjacent dovetail blocks, and when the split type parallel fusion cage for lumbar vertebra is completed, the upper through hole (28) is communicated with the lower through hole (12).

4. The lumbar split parallel fusion cage according to claim 3, characterized in that the dovetail block comprises a first dovetail (23), a second dovetail (24) and a third dovetail (25), and the locking hole (26) is opened on the third dovetail (25).

5. The split parallel lumbar fusion cage according to claim 1, wherein an arc groove is formed on the arc surface connecting the right working surface and the lower working surface of the grooved member (1), and a first holding rod (15) is arranged in the arc groove.

6. The split type parallel fusion cage for lumbar vertebra according to claim 1, characterized in that an arc groove is opened on the right working surface of the dovetail component (2), and a second clamping rod (27) is arranged in the arc groove.

7. The split type parallel fusion cage for lumbar vertebra according to claim 1, characterized in that positioning identification needles (16) penetrating through the front working surface and the rear working surface are arranged in both the grooved component (1) and the dovetail component (2), and the positioning identification needles (16) are arranged at the left end and the right end of the grooved component (1) and the dovetail component (2).

8. The lumbar split parallel fusion cage according to claim 7, wherein the positioning marker needle (16) is made of titanium alloy.

9. The lumbar split parallel fusion cage according to claim 1, wherein the slotted member (1) and the dovetail member (2) are made of polyetheretherketone or porous metal material.

10. The split type parallel lumbar fusion cage of claim 9, wherein the porous metal material is titanium alloy or tantalum metal.

Technical Field

The invention belongs to the technical field of medical instruments, and relates to a split type parallel fusion cage for lumbar vertebrae.

Background

Lumbar degeneration is a frequently encountered disease of human beings, and with the arrival of bad living habits of people and aging society in modern society, the incidence of diseases and the operation amount are gradually increased year by year in the world, thereby bringing great physical and mental disorders to patients and increasing the social medical burden. Lumbar degeneration with severe clinical symptoms such as lumbar intervertebral disc protrusion, lumbar spondylolisthesis, lumbar spinal stenosis and the like usually requires lumbar interbody fusion surgery to achieve complete nerve decompression and recover lumbar stability. With the continuous improvement of spinal surgical techniques and instruments in recent years, lumbar interbody fusion is mainly classified into posterior interbody fusion (PLIF), transforaminal posterior-lateral interbody fusion (TLIF), anterior interbody fusion (ALIF), and lateral anterior interbody fusion (OLIF). Clinically, the abdominal viscera and adjacent blood vessels and nerve complications are more in early stage due to high requirements of the anterior approach and the lateral anterior approach on surgical instruments and operators. Thus, currently most lumbar interbody fusions choose a posterior or transforaminal posterolateral approach and are familiar to spinal surgeons. The lumbar interbody fusion cage has multiple functions of supporting and lifting intervertebral space, providing bone grafting space, promoting interbody fusion, recovering lumbar lordosis and the like in interbody fusion.

At present, most of lumbar vertebra posterior and posterolateral approach fusion devices are in the shape of bullet heads with small volumes, and the local dura mater and nerve roots block the fusion devices, so that the placement of the fusion devices with large intervertebral space is difficult. The posterior bullet-shaped fusion cage can only provide unilateral support in unilateral PLIF or TLIF operation, and has other complications such as limited bone grafting space, poor lumbar lordosis recovery effect, displacement of the fusion cage and the like, so that the postoperative curative effect cannot be ensured. The limited placement of the large-size fusion cage in the posterior or posterolateral approach of the lumbar vertebra is also a difficult medical combination problem in the lumbar vertebra degeneration field in recent years.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a split type parallel fusion cage for lumbar vertebrae, which solves the problem that the placement of a large-size fusion cage in a posterior or posterolateral approach of lumbar vertebrae is limited.

The invention is realized by the following technical scheme:

a lumbar split type parallel fusion cage comprises a slotted component, a dovetail component and a locking screw;

the slotted component comprises a front working face, a rear working face, an upper working face, a lower working face, a left working face and a right working face, wherein a first bone grafting window penetrating through the front working face and the rear working face is arranged on the slotted component;

the dovetail component comprises a front working surface, a rear working surface, an upper working surface, a lower working surface, a left working surface and a right working surface, a second bone grafting window penetrating through the front working surface and the rear working surface is formed in the dovetail component, a dovetail used for sliding in a dovetail groove track is arranged on the lower working surface, and a locking hole is formed in the right end surface of the dovetail;

in use, the slotted member is placed under the dovetail member, and the slotted member and the dovetail member are connected by a locking screw.

Furthermore, first inverted teeth are arranged on the front working surface and the rear working surface of the component with the groove, and second inverted teeth are arranged on the front working surface and the rear working surface of the dovetail component.

Further, open on the dovetail groove track have with first bone grafting window through-hole down, the forked tail includes a plurality of dovetail blocks, just is located to open between two adjacent dovetail blocks on the lower working face of forked tail component has with the second bone grafting window through-hole that link up, when trough of belt component and forked tail component concatenation were accomplished, goes up the through-hole and is in the connected state with lower through-hole.

Further, the dovetail block includes a first dovetail, a second dovetail, and a third dovetail, and the locking hole is formed in the third dovetail.

Furthermore, an arc groove is formed in the arc surface, connected with the right working surface and the lower working surface of the grooved component, and a first clamping rod is arranged in the arc groove.

Furthermore, an arc groove is formed in the right working face of the dovetail component, and a second clamping rod is arranged in the arc groove.

Furthermore, all be equipped with the location sign needle that runs through preceding working face and back working face in grooved component and the forked tail component, location sign needle is located the left end and the right-hand member of grooved component and forked tail component.

Furthermore, the positioning marking needle is made of titanium alloy materials.

Further, the slotted member and the dovetail member are made of polyetheretherketone or a porous metal material.

Further, the porous metal material is titanium alloy or tantalum metal.

Compared with the prior art, the invention has the following beneficial technical effects:

the invention discloses a split type parallel fusion cage for lumbar vertebrae, which comprises a slotted component and a dovetail component, wherein bone grafting windows penetrating through front and rear working surfaces are formed on the slotted component and the dovetail component, so that a bone grafting space can be increased; the dovetail groove rail is arranged on the upper working face of the grooved component, the dovetail is arranged on the lower working face of the dovetail component, the dovetail can slide in the dovetail groove rail, during use, the dovetail component is placed above the grooved component, the dovetail of the dovetail component is aligned with the open end of the dovetail groove rail of the grooved component and is placed into the dovetail groove rail, knocking implantation is carried out, and two components are fixed by using locking screws until the dovetail slides into the foremost end of the dovetail groove rail. The biggest characteristic of the fusion cage is that the fusion cage is assembled into a whole after being sequentially arranged by adopting unique split type design, thereby effectively improving the size of the traditional lumbar fusion cage and avoiding the damage of nerves in the arranging process, and the fusion cage has the other characteristic that the fusion cage is transversely arranged in the intervertebral space after being arranged in through a posterior way or a posterolateral approach, thereby realizing the bilateral support effect. The fusion device after being combined in parallel is in a locked state, and meanwhile, the whole inner plant is in a wedge-like structure, so that the design is favorable for reconstructing the physiological curvature of the lumbar; through safe triangular implantation of lumbar vertebrae, nerve injury is reduced, and fit and locking are realized after splicing in vivo; the end plate support with larger area is realized for osteoporosis patients with poorer bone conditions, and the complications of collapse, internal fixation loosening and the like caused by uneven stress of intervertebral space are reduced. In a word, under the condition of not damaging nerves, the fusion cage is placed through the posterior or posterolateral direction and has larger end plate supporting area and bone grafting space; meanwhile, the lumbar vertebra curvature recovery device can be placed in a single side and provide bilateral support, and the lumbar vertebra curvature recovery function is considered. Compared with the traditional bullet fusion cage which is implanted in a single side, the assembled fusion cage has unique advantages in the aspects of end plate supporting area, bone grafting space and end plate collapse prevention, has smaller risk of surgical approach close to abdominal cavity visceral organs blood vessels compared with the anterior approach and the oblique lateral approach, is easier to be accepted by spinal surgeons, and breaks through the technical problem that the lumbar vertebra posterior approach or the posterior lateral intervertebral foramen approach surgery can not implant a larger fusion cage.

Furthermore, two working faces around fluted component and forked tail component all adopt pawl structural design, increase frictional force, prevent to implant the nerve of oppression that the back fuses ware shifts backward.

Further, it has the lower through-hole that link up with first bone grafting window to open on the dovetail groove track, just lies in to open between the two adjacent dovetail blocks on the lower working face of dovetail component has the last through-hole that link up with second bone grafting window, packs bone particle when planting in the bone grafting window and puts into internal back, and the bone cell that the growth was crawled can be with the help of upper and lower through-hole connection two components, makes intervertebral space bony fusion more thorough, fuses the ware more stable.

Furthermore, the tail ends of the two components of the fusion device are provided with clamping parts of an implantation tool, so that the operation of an operator is facilitated.

Furthermore, all be equipped with the location sign needle that runs through preceding working face and back working face in slotted component and the forked tail component, when using X ray perspective like this, can fix a position the position of fusion ware in the body through four angles.

Drawings

FIG. 1 is a front view of the assembly process of the split type parallel fusion cage for lumbar vertebrae of the present invention;

FIG. 2 is another view showing the assembly process of the split type parallel fusion cage for lumbar vertebrae according to the present invention;

FIG. 3 is a front view of the assembled split type parallel lumbar cage of the present invention;

FIG. 4 is a perspective view of a grooved member of the present invention;

FIG. 5 is another directional view of FIG. 4;

FIG. 6 is a top view of FIG. 4;

FIG. 7 is a right side view of FIG. 4;

FIG. 8 is a perspective view of a dovetail member of the present invention;

FIG. 9 is a right side view of FIG. 8;

FIG. 10 is a bottom view of FIG. 8;

fig. 11 is a schematic view of the lumbar vertebrae split type parallel fusion cage of the present invention in a state of use in an intervertebral space.

Wherein: 1 is a grooved component, 2 is a dovetail component, and 3 is a locking screw;

11 is a first bone grafting window, 12 is a lower through hole, 13 is a first pawl, 14 is a dovetail groove track, 15 is a first clamping rod, and 16 is a positioning identification needle;

21 is a second bone-grafting window, 22 is a second inverted tooth, 23 is a first dovetail, 24 is a second dovetail, 25 is a third dovetail, 26 is a locking hole, 27 is a second clamping rod, and 28 is an upper through hole.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

as shown in fig. 1 to 3, the split type lumbar parallel fusion cage comprises a trough member 1, a dovetail member 2 and a locking screw 3, wherein the trough member 1 is arranged below the dovetail member 2, the trough member 1 and the dovetail member 2 are connected through the locking screw 3, the trough member 1 and the dovetail member 2 are of concentric arc banana-shaped structures, and after the split type lumbar parallel fusion cage is assembled, the split type lumbar parallel fusion cage is of a wedge-like structure with a thin upper end and a thick lower end.

As shown in fig. 4 to 5, the grooved component 1 includes a front working surface, a rear working surface, an upper working surface, a lower working surface, a left working surface and a right working surface, the grooved component 1 is provided with a first bone grafting window 11 penetrating through the front working surface and the rear working surface, the front working surface and the rear working surface of the grooved component 1 are provided with first inverted teeth 13, the upper working surface is provided with a dovetail groove track 14, and the dovetail groove track 14 is provided with an opening on the right working surface.

As shown in fig. 8 to 9, the dovetail member 2 includes a front working surface, a rear working surface, an upper working surface, a lower working surface, a left working surface, and a right working surface, the dovetail member 2 is provided with a second bone grafting window 21 penetrating the front working surface and the rear working surface, the front working surface and the rear working surface of the dovetail member 2 are provided with second inverted teeth 22, the lower working surface is provided with a dovetail for sliding in the dovetail groove rail 14, and the right end surface of the dovetail is provided with a locking hole 26.

Preferably, as shown in fig. 5 and 6, a lower through hole 12 penetrating the first bone grafting window 11 is formed on the dovetail rail 14, as shown in fig. 8 and 10, the dovetail includes a plurality of dovetail blocks, an upper through hole 28 penetrating the second bone grafting window 21 is formed on the lower working surface of the dovetail member 2 and between two adjacent dovetail blocks, and when the coupling of the grooved member 1 and the dovetail member 2 is completed, the upper through hole 28 is in a state of being communicated with the lower through hole 12. This ensures that the bone particles within the two components eventually grow and fuse together.

Specifically, as shown in FIG. 10, the dovetail block includes a first dovetail 23, a second dovetail 24, and a third dovetail 25, and a locking hole 26 is formed in the third dovetail 25.

Preferably, an arc groove is formed on the arc surface connecting the right working surface and the lower working surface of the grooved component 1, and a first clamping rod 15 is arranged in the arc groove; an arc groove is arranged on the right working surface of the dovetail component 2, and a second clamping rod 27 is arranged in the arc groove. The first clamping rod 15 and the second clamping rod 27 facilitate the fixing members to be sequentially placed into the body by the operator using a holding tool.

The grooved member 1 and the dovetail member 2 are made of polyetheretherketone or a porous metal material, and the porous metal material is titanium alloy or tantalum metal.

More preferably, positioning index pins 16 penetrating through the front working surface and the rear working surface are provided in both the grooved component 1 and the dovetail component 2, and the positioning index pins 16 are provided at the left and right ends of the grooved component 1 and the dovetail component 2. The positioning marker needle 16 is made of titanium alloy material, so that the position of the fusion cage can be monitored through four corners when the fusion cage is seen by X-ray.

In addition, the fusion cage may also be made of a titanium alloy material, which is relatively expensive to manufacture, and the entire cage position is visible in X-ray fluoroscopy. The scheme can be realized by adopting a die casting or rapid prototyping (3D printing) mode according to the three-dimensional modeling data, and can realize the porous and surface modification treatment of the fusion cage, thereby being more beneficial to bone grafting fusion.

The first and second inverted teeth 13 and 22 are inverted toward the side where the locking screw 3 is installed, preventing the cage from being displaced and withdrawn in the body after implantation.

As shown in fig. 11, taking the inferior transforaminal approach lumbar interbody fusion of the left lumbar disc herniation of the waist 4/5 as an example, the joint of the left lumbar 4/5 zygapophysis is positioned, the left inferior zygapophysis of the waist 4 and the osteotomy of part of the superior zygapophysis of the waist 5 are placed in sequence to reduce pressure, and then the intervertebral foramen of the left lumbar 4/5 is opened. The lumbar 4/5 intervertebral space is decompressed from the left side according to conventional operation, the nucleus is removed, and the cartilage of the adjacent end plates is scraped to the bone surface. The two bone grafting windows of the fusion cage were filled with bone particles for future use. After the partial autologous bone particles are filled, the grooved component 1 of the split type parallel fusion cage is fixed from the left intervertebral foramen by using a holding tool, and the split type parallel fusion cage is obliquely arranged in the intervertebral space after being knocked and implanted. The dovetail component 2 is then grasped with a tool and aligned with the trailing track of the slotted component 1, and the implant is tapped until the forward most end of the dovetail slot, securing the two components using the locking screw 3. The fusion cage is placed transversely in the intervertebral space by continuous knocking. The thick bottom of fusion ware after the concatenation is located intervertebral space ventral, and thinner upper end is located intervertebral space dorsal part to realize that the unilateral is put into bigger size fusion ware and is reached two sides and fill and support, realize automatically rebuilding simultaneously waist 4/5 ventral high dorsal part low physiology lordosis degree. Under the condition that the height of the rear edge of the vertebral body is less than that of the front edge, the fusion cage is not easy to withdraw. The split type implanted nerve is spliced in the body, so that the nerve is not easily damaged in the implanting process, and meanwhile, the fusion cage body is connected in parallel to provide a larger supporting surface and a bone grafting space. The position of the X-ray machine perspective fusion cage in the operation is symmetrically distributed in the intervertebral space, and the two sides of the waist 4-5 are fixed by a percutaneous pedicle screw-rod system after the position is good.

Because the local nerve structure of lumbar vertebrae blocks, it can extrude the injury nerve to put into the large-size fusion cage through dura mater and nerve root clearance, so put into a component that is close to traditional fusion cage size with the help of the equipment concatenation mode single and avoid damaging nerve, and realize that whole size is greater than traditional single fusion cage effect after the internal equipment is accomplished. The traditional fusion cage is vertically placed in the intervertebral space, only single-side support is realized, and the transverse fusion cage has the advantages that the opposite side can be reached, and double-side support is realized.

The invention has the advantages of ingenious and unique design scheme, simple structure and strong compatibility, and can meet the requirement of supporting bone grafting in the intervertebral spaces of thoracic vertebrae and lumbar vertebrae after posterior approach or intervertebral foramen posterolateral approach. Is suitable for treating the thoracolumbar degeneration, trauma or other diseases requiring intervertebral fusion, and can be used in minimally invasive or open surgery type lumbar interbody fusion. Can be used for treating thoracolumbar intervertebral fusion operation cases in transforaminal or posterior open operation, under-channel and endoscopic operation, including thoracolumbar degenerative diseases, thoracolumbar trauma and other diseases.

While the embodiments of the present invention have been described in detail with reference to the drawings, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and the scope of the present invention is within the scope of the claims.