CN210990945U

CN210990945U - Spiral ejection type intervertebral fusion device

Info

Publication number: CN210990945U
Application number: CN201921108173.XU
Authority: CN
Inventors: 段德胜; 刘江; 王国华
Original assignee: Hunan Printer Medical Devices Co ltd
Current assignee: Hunan Huaxiang Medical Technology Co ltd
Priority date: 2019-07-16
Filing date: 2019-07-16
Publication date: 2020-07-14
Anticipated expiration: 2029-07-16

Abstract

The utility model relates to the technical field of spinal fusion cage, in particular to a spiral ejection type intervertebral fusion cage. Aims to solve the problems that the height and the size of the intervertebral fusion cage at the present stage are difficult to adjust, the injury is large in the operation, or the postoperative rehabilitation difficulty is large. Including printing fashioned square or oval base by metal tantalum 3D, establish the cavity in the base, it is equipped with a pair of spacing groove to go out at the minor face of base or sharp arc, lifting screw passes through spacing groove both ends installation adjusting nut, lifting screw bilateral symmetry sets up the opposite screw thread of turning round to the cooperation suit lift spiral shell piece, each hinge on two lift spiral shell pieces is propped up and is connected lifter group, the bottom of lifter group is propped up with the inside diapire of cavity and is connected, the lower surface of connecting the roof is propped up and is connected to the top. A through hole is arranged from the upper surface of the top plate to the lower part in a penetrating way. Has the advantages that: the height-adjusting of being convenient for more is favorable to realizing the regulation of specific thickness to the disease individual, and its structural arrangement is favorable to the bone to grow into simultaneously, promotes intervertebral fusion and the recovered growth in later stage.

Description

Spiral ejection type intervertebral fusion device

Technical Field

The utility model relates to the technical field of spinal fusion cage, in particular to a spiral ejection type intervertebral fusion cage.

Background

Degenerative spinal diseases are common spinal surgical diseases which seriously affect the life and work of patients, and once medicine and physical conservative treatment are ineffective, surgical treatment is required, and the surgical mode is developed from a simple discectomy to the most common intervertebral fusion at present. Intervertebral fusion is a treatment that can effectively restore spinal stability and protect neurological function. The interbody fusion is to remove the intervertebral disc structure in the intervertebral space, scrape the upper and lower cartilage end plates, implant various fusion materials between the two centrums, not only can reduce the complications such as loosening, breaking, extraction and the like of the internal fixation screw, but also can accelerate and improve the interbody fusion rate and the fusion quality.

An ideal interbody cage should not only maintain segmental stability, provide an ideal biomechanical environment, but also achieve true interbody fusion in an efficient time. Most of the conventional intervertebral fusion devices are made of titanium alloy or PEEK (polyether ether ketone) material, and have only a physical supporting function but no bone ingrowth function. The most suitable interbody fusion cage material not only needs to provide an ideal biomechanical environment, but also can achieve actual interbody fusion in an effective time, and has no toxic or side effect after being implanted into a body. At present, medical porous tantalum is widely used in orthopedic clinical repair, has osteogenic performance and is an excellent bone tissue repair material.

Simultaneously, traditional interbody fusion cage of present stage is the standard product mostly, highly can not adjust, can't accomplish and highly tight combination in different intervertebral spaces, the utility model discloses an interbody fusion cage has height-adjustable's function, implants intervertebral space after, accessible screw height-adjusting realizes with the perfect cooperation in intervertebral space and moderate degree pressurization, increase stability and fusion quality.

At present, most of intervertebral fusion devices are made of titanium alloy or PEEK (polyether ether ketone) materials, and only have a physical supporting effect but no bone ingrowth effect. While the height may not be adjustable. The most must possess the support device, be in the bone material of support device middle part and fill equipment and prevent the self-locking device that the support device drops, wherein self-locking device is mostly self-locking claw. In the prior art, the improvements are focused on the overall device profile, which provides a tighter fit to the upper and lower discs, or facilitates the filling of the bone material filling device. For example, the following steps are carried out: 1. the patent technology of the published patent technology, with application number of CN201520870979.8, named as a banana-shaped interbody fusion cage, discloses an interbody fusion cage, the main body of which is a banana-shaped PEEK ring viewed from above, the top and bottom surfaces of the main body are provided with dense sharp teeth, the left and right sides of the main body are respectively provided with more than one perforation, and the interbody fusion cage is provided with at least one elongated slot for filling broken bones based on the perforation, the shape of the interbody fusion cage is close to the cross section of intervertebral disc, the interbody fusion cage has better biocompatibility and elastic modulus closest to sclerotin, the shape and size of the interbody fusion cage are easy to identify, but the thickness of the interbody fusion cage is difficult to adjust, and the interbody fusion cage is inconvenient; 2. among the published patent technologies, the patent with the application number of CN201720134223.6 named as lifting interbody fusion cage, the guide block in the patent is slidably installed in the guide groove, the height adjustment is convenient, the device can adapt to the interbody height of different patients, the treatment effect is good, however, the defects are that in the adjustment process, multiple devices with multiple degrees of freedom are provided, the adjustment is inconvenient, especially, the applicant finds in long-term clinical tests that the structure has at least two inclined planes due to too high flexibility, the deformation condition is easy to occur in later-stage rehabilitation, particularly, the stress effect of the part is extremely poor under the standing condition of a patient, the displacement hidden danger of the inclined planes is large, and the rehabilitation after the patient operation is affected.

To sum up, everyone's intervertebral disc space height all is different, and simultaneously, traditional material does not have the bone and grows into the characteristic, and prior art exists the size and is difficult to adjust the injury in the art big, or the flexibility ratio of adjusting is too high, or the recovered big problem of the degree of difficulty of postoperative.

SUMMERY OF THE UTILITY MODEL

After consulting the literature, the intervertebral fusion cage taking porous tantalum as the material is rarely reported. Therefore, the utility model takes medical porous tantalum as material, designs the novel porous interbody fusion cage with osteogenic performance, so that the fusion cage has a three-dimensional communicated pore structure similar to human bones and has ideal biomechanical strength and higher osteogenic performance. The utility model aims at solving the problems that the size of the interbody fusion cage in the existing interbody fusion is difficult to adjust, the injury in the operation is large, or the flexibility of the adjustment is too high, or the difficulty of postoperative rehabilitation is large.

The utility model has the following concrete scheme:

the utility model provides a design one kind is printed fashioned square or oval base by metal tantalum 3D, establish the cavity in the base, go out at the minor face of base or sharp arc and be equipped with a pair of spacing groove, the lifting screw wears to warp spacing groove both ends installation adjusting nut, lifting screw bilateral symmetry sets up and revolves to opposite screw thread to cooperation suit lifting screw piece, each hinge on two lifting screw pieces is propped up and is connected lifter group, the bottom of lifter group with the inside diapire hinge of cavity is propped up and is connected, and the lower surface of connecting the roof is propped up and is connected to the top. And a through hole penetrates downwards from the upper surface of the top plate, the upper surface of the top plate and the lower surface of the base are also provided with locking clamping jaws, and a bone material injection hole is formed in the bottom.

In specific implementation, the lifting rod group comprises an upper lifting rod and a lower lifting rod, two ends of the upper lifting rod are respectively connected with the lifting screw block and the top plate, two ends of the lower lifting rod are respectively connected with the lifting screw block and the base, and the lifting rod groups on two sides are installed in a 7-shaped manner. The length of the screw is smaller than the distance between the two farthest edges of the base, the adjusting nut is an inner hexagonal nut, and the edges of the inner hexagonal nut are tangent to the two sides of the limiting groove. The locking claw comprises at least 5 rows of clamping grooves extending towards the inner side of the human body.

In specific implementation, the device further comprises a clamping block buckled in the limiting groove, clamping columns are arranged at two ends of the clamping block, and the edge of the clamping block is clamped with the outer edge of the base. The groove length of the limiting groove is less than 6 mm.

In specific implementation, a positioning pin hole is further formed in the outer portion of the base to wrap and mount the anti-overflow sticker. The length of the anti-overflow paste is consistent with the perimeter of the base, and the width of the anti-overflow paste is larger than the groove length of the limiting groove.

The beneficial effects of the utility model reside in that:

the thickness adjustment is increased, the freedom degree of each part is effectively limited, the adjustment of specific thickness for a patient individual is facilitated, and meanwhile, the structure arrangement of the adjustable;

the embedded design of the adjusting nut ensures that the surface structure of the equipment is smoother, thereby reducing the difficulty for later rehabilitation;

the design of the self-locking type clamping groove enables the shaping and positioning effects of the device after operation to be better, the tolerance to be stronger and the rehabilitation quality to be further guaranteed;

the use of the 3D printed metal tantalum material increases the strength of the device, and the porous structure of the device facilitates the growth of bone.

Drawings

FIG. 1 is a perspective view of the structure of the present invention;

FIG. 2 is a front view of the structure of the present invention;

fig. 3 is a top view of the structure of the present invention;

fig. 4 is a left side view of the structure of the present invention;

FIG. 5 is a sectional view taken along line A-A in FIG. 4;

fig. 6 is a left side view of another embodiment of the present invention;

names of components in the drawings: 1. a base; 2. a limiting groove; 3. a lifting screw; 4. lifting screw blocks; 5. a lifter group; 6. a top plate; 7. locking the clamping jaw; 8. adjusting the nut; 9. a clamping block; 10. an anti-overflow paste; 11. a through hole; 12. injecting bone material into the hole.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

Example 1

The utility model provides a spiral ejection formula interbody fusion cage, refer to fig. 1 to 5, the design includes and prints fashioned square or oval base 1 by metal tantalum 3D, establish the cavity in the base 1, minor face or sharp arc play at base 1 are equipped with a pair of spacing groove 2, lifting screw 3 wears through spacing groove 2 both ends installation adjusting nut 8, lifting screw 3 bilateral symmetry sets up the opposite screw thread of direction of turning soon, with cooperation suit lifting screw piece 4, each hinge connects lifter group 5 on two lifting screw pieces 4, the bottom of lifter group 5 is connected with the inside diapire hinge of cavity, the lower surface of roof 6 is connected to the top hinge. A through hole 11 is formed through the top plate 6 from the upper surface to the lower surface, a locking claw 7 is further provided on the upper surface of the top plate 6 and the lower surface of the base 1, and a bone material injection hole 12 is provided on the base 1. The design has the advantages that the precision of height adjustment is accurate to the micron level, and gaps among components are further prevented.

The lifting rod group 5 comprises an upper lifting rod and a lower lifting rod, two ends of the upper lifting rod are respectively connected with the lifting screw block 4 and the top plate 6, two ends of the lower lifting rod are respectively connected with the lifting screw block 4 and the base 1, and the lifting rod groups 5 on two sides are installed in a shape of 7 opposite to each other. In the design, at least two groups of rod pieces ensure the level and stability of the equipment.

Adjusting nut is outer square adjusting nut in this embodiment, and the length of screw is less than the distance of two farthest edges of base 1, can replace for hexagon socket nut in concrete work, and hexagon socket nut's edge is tangent with the both sides of spacing groove 2. The adjustment is convenient, and the surface of the device is relatively smooth, so that the contact area to human tissues is reduced.

The locking claw 7 comprises at least 5 rows of clamping grooves extending towards the inner side of the human body. The friction force between the equipment and the upper and lower contact surfaces is enhanced, and the anti-skidding and anti-falling effects are achieved.

The device also comprises a clamping block 9 buckled in the limiting groove 2, clamping columns are arranged at two ends of the clamping block 9, and the edge of the clamping block 9 is clamped with the outer edge of the base 1. The limit card is installed at the end, and the design aim is to make the surface as smooth as possible.

The groove length of the limiting groove 2 is less than 6 mm.

Example 2

The principle of the embodiment is the same as that of embodiment 1, and the specific difference is that, as shown in fig. 6, a positioning pin hole is further formed in the outer portion of the base 1 to wrap and mount the anti-overflow sticker 10, the length of the anti-overflow sticker 10 is consistent with the perimeter of the base 1, and the width of the anti-overflow sticker is larger than the groove length of the limiting groove 2. Except for the surface which is most close to the inner part, the anti-overflow paste is preset in advance, and other side surfaces can be positioned and installed after shaping and locking, so that bone materials are prevented from overflowing. In practical conditions, the gaps are very few, the possibility of overflow is low in the process of bone material growth, and the anti-overflow paste is designed to prevent the occurrence of overflow.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A screw-ejection type interbody fusion cage, comprising: a square or oval base (1) formed by 3D printing of metal tantalum, wherein a cavity is arranged in the base (1), a pair of limiting grooves (2) are arranged on the short side or the sharp arc of the base (1), adjusting nuts (8) are arranged at the two ends of the limiting grooves (2) through which the lifting screw (3) passes, threads with opposite rotation directions are symmetrically arranged on the two sides of the lifting screw (3), the lifting screw blocks (4) are matched and sleeved, the two lifting screw blocks (4) are respectively hinged and connected with a lifting rod group (5), the bottom end of the lifting rod group (5) is hinged with the inner bottom wall of the cavity, the top end of the lifting rod group is hinged with the lower surface of the top plate (6), a through hole (11) penetrates downwards from the upper surface of the top plate (6), the upper surface of the top plate (6) and the lower surface of the base (1) are also provided with locking claws (7), and the base (1) is provided with bone material injection holes (12).

2. The screw ejection-type intersomatic cage of claim 1, wherein: the lifting rod group (5) comprises an upper lifting rod and a lower lifting rod, the two ends of the upper lifting rod are respectively connected with a lifting screw block (4) and a top plate (6), the two ends of the lower lifting rod are respectively connected with the lifting screw block (4) and a base (1), and the lifting rod groups (5) on the two sides are installed in a 7-shaped mode.

3. The screw ejection type intersomatic cage of claim 2, wherein: the length of the screw is smaller than the distance between the two farthest edges of the base (1), the adjusting nut (8) is an inner hexagonal nut, and the edges of the inner hexagonal nut are tangent to the two sides of the limiting groove (2).

4. The screw ejection-type intersomatic cage of claim 1, wherein: the locking claw (7) comprises at least 5 rows of clamping grooves extending towards the inner side of the human body at the installation positions.

5. The screw ejection-type intersomatic cage of claim 1, wherein: the clamping device is characterized by further comprising a clamping block (9) buckled in the limiting groove (2), clamping columns are arranged at two ends of the clamping block (9), and the edge of the clamping block (9) is clamped with the outer edge of the base (1).

6. The screw ejection-type intersomatic cage of claim 1, wherein: the groove length of the limiting groove (2) is less than 6 mm.

7. The screw ejection-type intersomatic cage of claim 1, wherein: the anti-overflow device is characterized in that a positioning pin hole is further formed in the outer portion of the base (1) to wrap and mount the anti-overflow sticker (10), the length of the anti-overflow sticker (10) is consistent with the circumference of the base (1), and the width of the anti-overflow sticker is larger than the groove length of the limiting groove (2).