CN116509604A - Adjustable micro-motion interbody fusion cage - Google Patents

Abstract

The invention provides an adjustable micro-motion intervertebral fusion device, belonging to the technical field of medical materials, comprising: a fusion device body, the fusion device body includes a first body and a second body; the first body and the second body The body is overlapped and connected as a whole through a micro-motion structure, and both of them include a hinged first section and a second section; the first section and the second section are provided with vertical screw holes and the third screw hole is set There are screws; the screws are driven by the driving mechanism to ascend or descend along the threaded holes and be implanted in the vertebral body. The fuser body provided by the present invention has a micro-movement structure, so that the upper and lower vertebral bodies have a certain degree of mobility, which can improve the patient's comfort; at the same time, the screw is perpendicular to the vertebral body, which can greatly improve the holding ability of the screw in the vertebral body, and improve the comfort of the patient. The strength of the connection between the fusion cage and the vertebral body.

Description

An adjustable micro-motion intervertebral fusion device

technical field

The invention relates to the technical field of medical materials, in particular to an adjustable micro-motion intervertebral fusion device.

Background technique

With the changes in people's lifestyles in recent years, the incidence and surgery rates of the vertebral body are increasing year by year, and showing a younger trend. Cervical bone hyperplasia caused by cervical disc degeneration or cervical spine injury, or a syndrome of different clinical symptoms caused by cervical disc herniation, thickening of the posterior longitudinal ligament and ligamentum flavum, stimulation or compression of the spinal cord, cervical nerves, and blood vessels The lower thoracic spine is the frequent site of unstable thoracic fractures and spinal fractures in patients with ankylosing spondylitis; lumbar degenerative diseases such as lumbar disc herniation, spondylolisthesis, and lumbar spinal stenosis cause intervertebral disc degeneration, small Central canal stenosis, segmental instability, and cartilage endplate degeneration can cause severe mechanical back pain, nerve root symptoms, intermittent claudication, and even incontinence. Vertebral lesions lead to reduced mobility and reduced quality of life for patients.

A large number of clinical practices and long-term postoperative follow-up have confirmed that spinal fusion can maintain the stability of the vertebral body sequence, relieve spinal cord or nerve root compression, and protect nerve function. Nerve tissue damage can be reduced through surgery, and an intervertebral fusion device can be placed at the same time, or accompanied by anterior fixation of the vertebral body, which can maintain the height of the intervertebral foramen, facilitate fusion, and provide cervical segmental stability and joint fusion for patients. Strength of.

At present, there are many types and shapes of intervertebral fusion cages on the market. Earlier, they were mainly hollow wedge-shaped, elliptical and kidney-shaped implants placed horizontally. Recently, intervertebral fusions with obliquely inserted inserts and (or) screws have appeared on the market, but the obliquely inserted fixing parts have relatively weak holding force on the vertebral body. At the same time, the intervertebral fusion device is more rigid than the human intervertebral disc, resulting in greatly weakened mobility between the fusion segments.

Contents of the invention

The purpose of the present invention is to provide an adjustable micro-motion intervertebral fusion device.

For solving the problems of the technologies described above, the purpose of the present invention is achieved in that:

An adjustable micro-motion intervertebral fusion device, comprising: a fusion device body;

The fuser body includes a first body and a second body; the first body and the second body are overlapped and connected as a whole through a fretting structure, and both include a hinged first section and a second section; the The end of the second section near the hinge is provided with a vertical first screw hole, and the end away from the first section is provided with a vertical second screw hole; the first section is far away from the second section A third vertical screw hole is opened at the end of the

Screws are arranged in the first screw hole, the second screw hole and the third screw hole; the screws are driven by a driving mechanism to ascend or descend along the threaded holes and implanted in the vertebral body.

On the basis of the above solution and as a preferred solution of the above solution, the drive mechanism includes a transmission channel, a worm wheel, a worm, and a screwdriver; the transmission channel extends from the end of the second section away from the first section to the The second screw hole is connected with the three screw holes; the worm gear is sleeved on the outside of the screw, rotates synchronously with the screw, and can slide up and down relative to the screw; the worm is rotatably fixed on the screw The inner hexagonal channel is opened in the center; one end of the screwdriver is set as a hexagonal column, which can cooperate with the inner hexagonal channel to drive the worm to rotate; the other end of the screwdriver is located at the outside the driveway.

On the basis of the above solution and as a preferred solution of the above solution, the screw includes a threaded section and a hexagonal section; the center of the worm wheel is provided with a hexagonal through groove, which is slidably and socketed on the hexagonal section.

On the basis of the above solution and as a preferred solution of the above solution, a hollow cavity is formed inside the screw; a tantalum wire is arranged inside the cavity.

On the basis of the above solution and as a preferred solution of the above solution, it also includes a gripper; the gripper is detachably fixedly connected to the end of the second segment away from the first segment, and along the second The length direction of the segment extends, and a screwdriver guide groove is recessed on one side to limit the screwdriver; the screwdriver guide groove is aligned with the transmission channel.

On the basis of the above-mentioned solution and as a preferred solution of the above-mentioned solution, the gripper is fixedly connected with the second section through a screw; the screw goes through the threaded hole of the gripper and the end of the second section. connect.

On the basis of the above solution and as a preferred solution of the above solution, the number of the fretting structures is three, which are respectively arranged at the corresponding positions of the first screw hole, the second screw hole and the third screw hole , including an elastic body, a fretting groove and a fretting bump; the fretting groove is provided at the bottom of the first body; the fretting bump is fixed at the bottom of the second body, and can be inserted into the micro inside the moving groove, and can move relatively after being inserted; the elastic body is arranged between the fine moving groove and the fine moving bump, and the two ends abut against the bottom of the fine moving groove and the fine moving groove respectively Bottom of the moving bump.

On the basis of the above solution and as a preferred solution of the above solution, the micro-movement bump is a hollow cylindrical structure, the top is divided into several petals, and the outer circumference of the top is provided with buckles; the micro-movement groove is in the shape of The cylindrical groove that the micro-movement bump is compatible with, and a slot is opened in the middle to match the buckle; the height of the slot is greater than the height of the buckle, when the buckle snaps in can still move relatively.

On the basis of the above solution and as a preferred solution of the above solution, the elastic body is one of a balloon, a spring, and a high elastic material.

The beneficial effects of the present invention are:

1. The body of the fusion body provided by the present invention includes a first body and a second body that overlap up and down. The two bodies are connected by micro-movements. After being implanted into the human body, the upper and lower vertebral bodies can be displaced in the vertical direction. At the same time, Depending on the direction of the force applied to the fusion segment, the vertebral bodies of the upper and lower vertebrae can form a certain angle of motion on the coronal and sagittal planes. The micro-movement structure makes the upper and lower vertebrae have a certain degree of mobility, which is closer to the original structure of the vertebral body, reduces the foreign body sensation of implantation, and improves the comfort of the patient.

2. The fuser body is fixed to the upper and lower vertebral bodies through vertical screws. Compared with the oblique placement of screws or inserts outside the vertebral body on the market, the holding ability of the screws in the vertebral body can be greatly improved. At the same time, with the help of a screwdriver, it is possible to effectively place screws vertically deep between the vertebral bodies, which is beneficial to improving the connection strength between the fusion body and the vertebral body.

3. The fuser body includes the first section and the second section which are hinged. It is straight when implanted, which can reduce the size of the implantation wound; it can be bent after implantation, which can increase the load-bearing area of the fuser body.

Description of drawings

Fig. 1 is a schematic diagram of the main body of the structural fusion device of the present invention.

Fig. 2 is a schematic diagram of the structure of the first body of the present invention.

Fig. 3 is a schematic diagram of the structure of the second body of the present invention.

Fig. 4 is a schematic diagram of the fuser body with the gripper and screwdriver of the present invention.

Fig. 5 is a schematic diagram of cooperation between the gripper and the screwdriver of the present invention.

Fig. 6 is a structural schematic diagram of the driving mechanism of the present invention.

Fig. 7 is a schematic diagram of the screw structure of the present invention.

Fig. 8 is a structural schematic diagram of the fretting structure of the present invention.

FIG. 9 is a schematic diagram of the structure of the micro-movement bump in the present invention.

In the figure: 1, the first body; 2, the second body; 11, the first section; 12, the second section; 13, the first screw hole; 14, the second screw hole; 15, the third screw hole; 16, Screw; 161, threaded section; 162, hexagonal section; 17, tantalum wire; 18, threaded hole; 31, transmission channel; 32, worm wheel; 33, worm; 34, screwdriver; 35, inner hexagon channel; 4, fretting structure ; 41, elastic body; 42, fretting groove; 42, fretting bump; 44, buckle; 45, card slot; 5, gripper;

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in FIGS. 1 to 4 , an adjustable micro-movement intervertebral fusion device includes: a fusion device body, and the fusion device body includes a first body 1 and a second body 2 . The first body 1 and the second body 2 are overlapped and connected as a whole through the fretting structure 4 , and both of them include a hinged first segment 11 and a second segment 12 . The end of the second section 12 close to the hinge is provided with a vertical first screw hole 13, and the end away from the first section 11 is provided with a vertical second screw hole 14, and the first section 11 is far away from the first section 11. The end of the second section 12 is provided with a vertical third screw hole 15 .

Screws 16 are arranged in the first screw hole 13 , the second screw hole 14 and the third screw hole 15 , and the screw 16 is driven by the driving mechanism to ascend or descend along the threaded holes to be implanted in the vertebral body.

In this embodiment, the first body 1 is located above the second body 2, the screw holes on the first body 1 are opened upwards, and the screws 16 inside it are connected with the upper vertebral body, and the screw holes of the second body 2 are opened downwards, and its Internal screws 16 are attached to the lower vertebral body. And, preferably, the end face of the second section 12 away from the first section 11 is a plane, and the end of the first section 11 away from the second section 12 is an arc surface. When implanting, the arc surface is used as the head and the plane is the tail. .

Wherein, as shown in FIG. 6 , the driving mechanism includes a transmission channel 31 , a worm wheel 32 , a worm 33 and a screwdriver 34 .

The transmission channel 31 extends from the end of the second section 12 away from the first section 11 to the second screw hole 14 and communicates with the three screw holes.

The worm gear 32 is sleeved on the outside of the screw 16 , rotates synchronously with the screw 16 , and can slide up and down relative to the screw 16 . The worm gear 32 is arranged inside the fusion body body and is rotatable. When rotating, it drives the screw 16 to rotate synchronously. When the screw 16 rotates, it cooperates with the screw hole to move up and down, and turns into the upper and lower vertebral bodies to realize the fixation of the fusion device. Preferably, as shown in FIG. 7 , the screw 16 includes a threaded section 161 and a hexagonal section 162 , and the threaded section 161 is located above the hexagonal section 162 . The center of the worm wheel 32 is provided with a hexagonal through groove, which is slidably and sleeved on the hexagonal section 162 , so that the worm wheel 32 and the screw 16 can rotate synchronously and slide up and down relative to each other.

Further, the inside of the screw 16 is hollow to form a cavity, and a tantalum wire 17 is arranged inside the cavity. Due to the occlusion of the vertebral body, X-rays are needed to determine the position of the screw 16 during the operation, so that the screw 16 can accurately reach the preset nail, and the tantalum wire 17 can improve the X-ray effect and facilitate the doctor to identify the screw 16 .

The worm 33 is rotatably fixed inside the transmission channel 31 and meshes with the worm wheel 32 , and a hexagonal channel 35 is opened in the center. The worm 33 is rotatably connected with the fusion body body, and the rotation can drive the worm wheel 32 to rotate.

One end of the screwdriver 34 is set as a hexagonal column, which can drive the worm 33 to rotate in conjunction with the inner hexagonal channel 35 . The other end of the screwdriver 34 is located outside the transmission channel 31 and is driven to rotate manually or by equipment. The thickness of the hexagonal column is greater than that of the screwdriver 34 body, so that the screwdriver 34 can pass through the inner hexagonal channel 35 .

In addition, as shown in FIG. 4 and FIG. 5 , the fuser body is also equipped with a gripper 5 . The gripper 5 is detachably fixedly connected to the end of the second section 12 away from the first section 11, and extends along the length direction of the second section 12, and a screwdriver guide groove 51 is recessed on one side to limit the screwdriver 34, The screwdriver guide groove 51 is aligned with the transmission channel 31 . The screwdriver 34 can be accurately aligned with the transmission channel 31 through the screwdriver guide groove 51 , so as to facilitate the overlapping of the screwdriver 34 and the worm 33 .

Specifically, the gripper 5 is screwed and fixedly connected to the second section 12 through a screw rod 52 , and the screw rod 52 passes through the gripper 5 and is threadedly connected to the threaded hole 18 at the end of the second section 12 . Preferably, the number of screws 52 is two, which are distributed at the upper and lower sides of the driver guide slot 51 .

In this embodiment, there are three fretting structures 4, which are respectively arranged at the corresponding positions of the first screw hole 13, the second screw hole 14 and the third screw hole 15, as shown in Fig. 8 and Fig. 9 , including elastic bodies 41 , the micro-movement groove 42 and the micro-movement bump 43 .

The micro-movement groove 42 is opened at the bottom of the first body 1 . The micro-movement protrusion 43 is fixed on the bottom of the second body 2 , can be inserted into the interior of the micro-movement groove 42 , and can move relatively after being inserted. The elastic body 41 is disposed between the micro-movement groove 42 and the micro-movement protrusion 43 , and its two ends abut against the bottom of the micro-movement groove 42 and the bottom of the micro-movement protrusion 43 respectively.

Specifically, the micro-movement bump 43 has a hollow cylindrical structure, and the top is divided into several petals, and there are gaps between the petals, so that the top of the micro-movement bump 43 can be squeezed and shrunk. A buckle 44 is provided on the outer circumference of the top end of the micro-movement protrusion 43 . The micro-movement groove 42 is a cylindrical groove compatible with the micro-movement protrusion 43 , and a locking groove 45 is opened in the middle to match the buckle 44 . The height of the slot 45 is greater than that of the buckle 44 , and it can still move relatively when the buckle 44 is engaged. When the micro-movement protrusion 43 is inserted into the micro-motion groove 42 , its head is squeezed and shrunk until the buckle 44 enters the locking groove 45 and then recovers. The height of the locking groove 45 is greater than the height of the buckle 44, which means that the depth of the locking groove 45 along the height direction of the fuser body is greater than the thickness of the buckle 44. The protrusion 43 can still move a short distance to the bottom of the micro-movement groove 42 to realize micro-motion. At the same time, the diameter of the outer circumference of the buckle 44 is also smaller than the diameter of the slot 45 , so that the micro-movement protrusion 43 can slightly move left and right relative to the micro-movement groove 42 .

Preferably, the elastic body 41 is one of a balloon, a spring, and a high elastic material.

Implantation process: thread the assembled fusion cage body with the holder 5, then insert the screwdriver 34 to match the worm 33 of the screw 16 corresponding to the third screw hole 15, and then insert the fusion cage body in a straight line and obliquely for implantation Between the vertebral bodies, after reaching the predetermined position, turn the screwdriver 34 to drive the screw 16 in the third screw hole 15 to implant into the vertebral body; then pull out the screwdriver 34, turn the body of the fusion body to bend it, and insert the screwdriver 34 after reaching the predetermined position Cooperate with the screw 16 of the first screw hole 12 to turn it into the vertebral body, complete the retreat screwdriver 34 to cooperate with the screw 16 in the second screw hole 14, rotate to make the screw 16 turn into the vertebral body, then withdraw from the screwdriver 34 and remove Lower the gripper 5.

The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art shall be within the scope of protection defined by the claims.

Claims (9)

1. An adjustable micro-motion intervertebral fusion device, comprising: a fusion device body; The fuser body includes a first body (1) and a second body (2); the first body (1) and the second body (2) are overlapped and connected as a whole through a micro-movement structure (4), and Both comprise a hinged first segment (11) and a second segment (12); the end of the second segment (12) near the hinge is provided with a vertical first screw hole (13), away from the The end of the first section (11) is provided with a vertical second screw hole (14); the end of the first section (11) away from the second section (12) is provided with a vertical third screw hole (15); Screws (16) are arranged in the first screw hole (13), the second screw hole (14) and the third screw hole (15); the screw (16) is driven by a driving mechanism along the threaded hole Ascend or descend implanted vertebral bodies. 2. An adjustable micro-movement intervertebral fusion device according to claim 1, characterized in that the drive mechanism includes a transmission channel (31), a worm wheel (32), a worm (33), a screwdriver (34) The transmission channel (31) extends from the end of the second segment (12) away from the first segment (11) to the second screw hole (14), and communicates with three screw holes; the The worm gear (32) is sleeved on the outside of the screw (16), rotates synchronously with the screw (16), and can slide up and down relative to the screw (16); the worm (33) is rotatably fixed on the Inside the transmission channel (31) and meshed with the worm wheel (32), a hexagonal channel (35) is opened in the center; one end of the screwdriver (34) is set as a hexagonal column, which can cooperate with the inner hexagonal channel (35) Drive the worm (33) to rotate; the other end of the screwdriver (34) is located outside the transmission channel (31). 3. An adjustable micro-motion intervertebral fusion device according to claim 2, characterized in that, the screw (16) includes a threaded section (161) and a hexagonal section (162); the center of the worm wheel (32) A hexagonal through groove is provided, which is slidably socketed on the hexagonal section (162) in a cooperating manner. 4. An adjustable micro-motion intervertebral fusion device according to claim 3, characterized in that, the inside of the screw (16) is hollow to form a cavity; the inside of the cavity is provided with a tantalum wire (17) . 5. An adjustable micro-movement intervertebral fusion device according to claim 2, characterized in that it further comprises a gripper (5); the gripper (5) is detachably fixedly connected to the second section (12) away from the end of the first section (11), extending along the length direction of the second section (12), and recessing a screwdriver guide slot (51) on one side to limit the screwdriver (34); the screwdriver guide slot (51) is aligned with the transmission channel (31). 6. An adjustable micro-motion intervertebral fusion device according to claim 5, characterized in that, the gripper (5) is screwed and fixedly connected with the second section (12) through a screw rod (52); The screw (52) passes through the gripper (5) and is threadedly connected with the threaded hole (18) at the end of the second section (12). 7. An adjustable fretting intervertebral fusion device according to claim 1, characterized in that, the number of the fretting structures (4) is three, which are respectively arranged in the first screw holes (13) , the corresponding place of the second screw hole (14) and the third screw hole (15), including an elastic body (41), a fretting groove (42) and a fretting protrusion (43); the fretting The groove (42) is opened at the bottom of the first body (1); the micro-movement bump (43) is fixed at the bottom of the second body (2), and can be inserted into the micro-movement groove (42) , and can be relatively moved after insertion; the elastic body (41) is arranged between the micro-movement groove (42) and the micro-movement bump (43), and the two ends respectively abut against the micro-motion groove (42) bottom and said fretting bump (43) bottom. 8. The adjustable micro-movement intervertebral fusion device according to claim 7, characterized in that, the micro-movement bump (43) is a hollow cylindrical structure, and the top is divided into several petals, and the outer circumference of the top is A buckle (44) is provided; the micro-movement groove (42) is a cylindrical groove compatible with the micro-motion bump (43), and a card slot (45) is opened in the middle to match the micro-movement bump (43). The buckle (44); the height of the slot (45) is greater than that of the buckle (44), and it can still move relatively when the buckle (44) is snapped in. 9. The adjustable micro-motion intervertebral fusion device according to claim 7, characterized in that, the elastic body (41) is one of a balloon, a spring, and a high-elastic material.