CN118662284B - An expandable fusion device for posterior lumbar fusion - Google Patents

Abstract

The invention discloses an expansion fusion device for posterior lumbar fusion, which belongs to the technical field of medical instruments and comprises a frame body, auxiliary positioning mechanisms, main positioning mechanisms, expansion mechanisms, locking frames and operating forceps mechanisms, wherein the main positioning mechanisms are connected in the middle of the frame body in a sliding mode, the two auxiliary positioning mechanisms are symmetrically arranged on two sides of the main positioning mechanisms, the auxiliary positioning mechanisms are connected on the frame body in a sliding mode, the expansion mechanisms are symmetrically arranged on two sides of the frame body, the locking frames are horizontally connected on two sides of the frame body in a sliding mode, and the operating forceps mechanisms are arranged on one side of the frame body. The invention has the advantages that the volume of the frame body is minimum when the frame body is implanted, the frame body can be implanted through a smaller incision, the surgical wound and the damage of surrounding tissues can be reduced, the frame body can be unfolded after implantation, the cross-sectional area of the frame body is increased while the height of the frame body is increased, the contact area between the frame body and the vertebrae is increased, and the initial stability is effectively improved.

Description

An expandable fusion device for posterior lumbar fusion

Technical Field

The invention belongs to the technical field of medical devices, and in particular relates to an expandable fusion device for posterior lumbar fusion.

Background Art

Posterior lumbar fusion is a spinal surgery used to treat a variety of lumbar spine conditions, such as lumbar instability, spondylolisthesis, severe lumbar disc herniation, spinal stenosis or other spinal degenerative diseases. This surgery is performed by entering from the back of the spine (i.e., the posterior approach) to remove part or all of the lamina, facet joints and/or intervertebral discs to decompress the nerve roots and promote fusion between adjacent vertebrae by implanting intervertebral fusion cages and internal fixation devices.

Intervertebral fusion device is one of the most important instruments, which plays a key role in influencing the surgical effect. Traditional intervertebral fusion devices have a single function and cannot be adjusted according to the specific situation of the patient to match the intervertebral space. In order to solve the above problems, expandable fusion devices have emerged. The expandable fusion device can expand in height after implantation, allowing surgeons to accurately control and restore the height of the intervertebral space and correct the problems caused by the loss of intervertebral disc height. However, traditional expandable fusion devices generally only have a single-plane expansion in which the fusion device contacts the upper and lower end plates. It cannot adapt to the slightly domed shape of the end plates, and cannot further improve the initial stability. In addition, errors during the operation will cause the fusion device to be displaced, and repositioning is required to continue subsequent operations, affecting the efficiency of the operation. There is also a risk of displacement and dislocation of the fusion device after surgery, requiring a secondary operation.

Summary of the invention

The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned prior art and provide an expandable fusion device for posterior lumbar fusion. The frame volume of the present invention is minimized when implanted, so that the frame can be implanted through a smaller incision, which helps to reduce surgical trauma and damage to surrounding tissues. The expansion mechanism can be unfolded after implantation. After the expansion mechanism is unfolded, it not only increases the cross-sectional area of the frame, but also increases the contact area between the frame and the vertebrae, effectively improving the initial stability. After the expansion mechanism is unfolded, it drives the auxiliary positioning mechanism to unfold. After the auxiliary positioning mechanism is unfolded, the height of the frame is raised, and the frame is stuck between the vertebrae to lock the position of the frame, so as to prevent the position of the frame from changing after the frame is touched due to operational errors, avoid readjusting the position of the frame, save operation time, improve operation efficiency, and maintain the stability of the fusion device for a long time after surgery.

The technical solution adopted to solve the above technical problems is: an expansion fusion device for posterior lumbar fusion, comprising a frame, a secondary positioning mechanism, a main positioning mechanism, an expansion mechanism, a locking frame and a surgical clamp mechanism, wherein the main positioning mechanism is slidably connected in the middle of the frame, the secondary positioning mechanism is in two groups, the secondary positioning mechanisms are symmetrically arranged on both sides of the main positioning mechanism, the secondary positioning mechanism is slidably connected to the frame, the expansion mechanism is symmetrically arranged on both sides of the frame, the locking frame is horizontally slidably connected on both sides of the frame, and the surgical clamp mechanism is arranged on one side of the frame;

There are six groups of expansion mechanisms, which are symmetrically arranged on both sides of the auxiliary positioning mechanism and the main positioning mechanism;

The locking frame can lock the expansion mechanism to expand, and the expansion mechanism can drive the auxiliary positioning mechanism to expand;

The surgical clamp mechanism can clamp the frame, and the locking frame is slidably connected to the surgical clamp mechanism.

Through the above technical solution, when performing posterior lumbar fusion surgery, the frame is implanted into the intervertebral space through the surgical clamp mechanism. After the frame reaches the predetermined position, the locking frame is pulled so that the locking frame gradually releases the lock on the expansion mechanism. After the expansion mechanism is deployed, the cross-sectional area of the frame is increased, and the contact area between the frame and the intervertebral space is increased, which effectively improves the initial stability and provides a wider surface for bone growth, thereby promoting long-term bone fusion. The expansion mechanism is deployed to drive the auxiliary positioning mechanism to be deployed. After the auxiliary positioning mechanism is deployed, the height of the frame is increased, and the frame is stuck between the vertebrae to lock the position of the frame to prevent the position of the frame from changing after the frame is touched due to operational errors, and to avoid readjusting the position of the frame, thereby saving surgical time and improving surgical efficiency. Subsequently, the surgical clamp mechanism can release the clamping of the frame, and then adjust the height of the main positioning mechanism to restore the correct intervertebral space height. The height of the auxiliary positioning mechanism can be adaptively adjusted with the height adjustment of the main positioning mechanism, and finally subsequent operations such as fixation can be performed.

Further, the auxiliary positioning mechanism includes a top plate, a bottom plate and a first spring, the top plate is slidably connected to the top of the frame, the bottom plate is slidably connected to the bottom of the frame, a first spring is fixedly connected between the top plate and the bottom plate, the first spring is four groups, the first spring is symmetrically arranged between the top plate and the bottom plate, the front and rear sides of the bottom of the top plate are symmetrically fixedly connected with an upper vertical plate, the front and rear sides of the top of the bottom plate are symmetrically fixedly connected with a lower vertical plate, an upper locking hole is arranged in the middle of the upper vertical plate, and a lower locking hole is arranged in the middle of the lower vertical plate, and the upper locking hole and the lower locking hole can be in the same horizontal plane.

Through the above technical scheme, since the top plate is slidably connected to the top of the frame, and the bottom plate is slidably connected to the bottom of the frame, a first spring is fixedly connected between the top plate and the bottom plate, and the first spring is four groups, and the first spring is symmetrically arranged between the top plate and the bottom plate, and the upper vertical plate is symmetrically fixedly connected to the front and rear sides of the bottom of the top plate, and the lower vertical plate is symmetrically fixedly connected to the front and rear sides of the top of the bottom plate, and the upper locking hole is arranged in the middle of the upper vertical plate, and the lower locking hole is arranged in the middle of the lower vertical plate, and the upper locking hole and the lower locking hole can be in the same horizontal plane, so that the first spring is compressed, and the top plate and the bottom plate can be stored to the top and bottom of the frame, thereby reducing the height of the frame before implantation, and when the first spring is compressed, the upper vertical plate and the lower vertical plate are tightly attached, and when the gap between the top plate and the bottom plate is the smallest, the upper locking hole and the lower locking hole are in the same horizontal plane.

Furthermore, the expansion mechanism includes a first expansion plate, a second expansion plate, an expansion plate and a torsion spring, one end of the first expansion plate is hinged to one end of the second expansion plate, a torsion spring is arranged at the hinge of the first expansion plate and the second expansion plate, and the first expansion plate and the second expansion plate are both slidably connected to the expansion plate at the top and bottom.

With the above technical solution, since one end of the first expansion plate is hinged to one end of the second expansion plate, a torsion spring is provided at the hinge between the first expansion plate and the second expansion plate, so that after the expansion mechanism is unlocked, the expansion mechanism is expanded to both sides of the frame.

Furthermore, tracks are symmetrically arranged on both sides of the frame, the expansion mechanism is arranged in the tracks, the other end of the first expansion plate is fixedly connected to a connecting sleeve, a rotating shaft is fixedly connected in the track, the connecting sleeve is rotatably connected to the rotating shaft, the other end of the second expansion plate is fixedly connected to a sliding rod, a sliding groove is arranged in the track, the sliding rod is slidably connected in the sliding groove, a second spring is fixedly connected to the expansion plate, one end of the second spring is fixedly connected to the first expansion plate and the second expansion plate, and the other end of the second spring is fixedly connected to the expansion plate.

Through the above technical scheme, since the expansion mechanism is arranged in the track, the other end of the first expansion plate is fixedly connected with a connecting sleeve, and a rotating shaft is fixedly connected in the track, the connecting sleeve is rotatably connected to the rotating shaft, the other end of the second expansion plate is fixedly connected with a sliding rod, and a sliding groove is arranged in the track, the sliding rod is slidably connected in the sliding groove, and a second spring is fixedly connected to the expansion plate, one end of the second spring is fixedly connected to the first expansion plate and the second expansion plate, and the other end of the second spring is fixedly connected to the expansion plate, so that when the expansion mechanism completely enters the track, the expansion mechanism is in a retracted state. At this time, the second spring is in a compressed state, and the expansion plate is blocked by the track and is completely stored in the first expansion plate and the second expansion plate. After the expansion mechanism is unlocked, the torsion spring drives the hinged ends of the first expansion plate and the second expansion plate to expand to both sides of the frame. At this time, the expansion plate leaves the track, and the second spring drives the expansion plate to expand naturally, thereby increasing the height of the expansion mechanism, and the expansion of the expansion mechanism increases the cross-sectional area of the frame.

Furthermore, a locking pin is fixedly connected to the first expansion plate, and the locking pin is arranged at one end of the hinge between the first expansion plate and the second expansion plate, and the locking pin can penetrate the upper locking hole and the lower locking hole at the same time.

Through the above technical solution, since the first expansion plate is fixedly connected with a locking pin, the locking pin is arranged at one end of the hinge between the first expansion plate and the second expansion plate, and the locking pin can penetrate the upper locking hole and the lower locking hole at the same time, so that when the expansion mechanism and the auxiliary positioning mechanism are contracted, the locking pin penetrates the upper locking hole and the lower locking hole at the same time, so that the auxiliary positioning mechanism is locked, and when the expansion mechanism is expanded, the locking pin disengages from the upper locking hole and the lower locking hole as the expansion mechanism is expanded, so that the auxiliary positioning mechanism is also expanded, so that the expansion mechanism drives the auxiliary positioning mechanism to expand.

Furthermore, the main positioning mechanism includes an upper positioning plate, a lower positioning plate, a first bevel gear, a second bevel gear and a third bevel gear, the upper positioning plate is slidably connected to the top of the frame, the lower positioning plate is slidably connected to the bottom of the frame, the first bevel gear is rotatably connected to the top of the frame, the second bevel gear is rotatably connected to the bottom of the frame, and the third bevel gear is rotatably connected to one side of the first bevel gear and the second bevel gear in the frame.

With the above technical solution, since the upper positioning plate is slidably connected to the top of the frame and the lower positioning plate is slidably connected to the bottom of the frame, the height of the frame can be adjusted by lifting the upper positioning plate and the lower positioning plate.

Furthermore, a threaded rod is fixedly connected to the bottom of the upper positioning plate, and the threaded rod passes through the first bevel gear, and the threaded rod is threadedly connected to the first bevel gear. A threaded sleeve is fixedly connected to the top of the lower positioning plate, and the threaded sleeve passes through the second bevel gear, and the threaded sleeve is threadedly connected to the second bevel gear, and the threaded rod can extend into the threaded sleeve.

Through the above technical scheme, since a threaded rod is fixedly connected to the bottom of the upper positioning plate, the threaded rod passes through the first bevel gear, the threaded rod is threadedly connected to the first bevel gear, and a threaded sleeve is fixedly connected to the top of the lower positioning plate, the threaded sleeve passes through the second bevel gear, and the threaded sleeve is threadedly connected to the second bevel gear, the threaded rod can extend into the threaded sleeve, so that the rotation of the first bevel gear can drive the upper positioning plate to rise and fall, and the rotation of the second bevel gear can drive the lower positioning plate to rise and fall, and the forward rotation of the first bevel gear can drive the upper positioning plate to rise, the reverse rotation of the first bevel gear can drive the upper positioning plate to fall, the forward rotation of the second bevel gear can drive the lower positioning plate to fall, and the reverse rotation of the second bevel gear can drive the lower positioning plate to rise, and the threaded rod can extend into the threaded sleeve so that the upper positioning plate and the lower positioning plate can be stored in the frame.

Furthermore, the top of the third bevel gear is meshed with the first bevel gear, the bottom of the third bevel gear is meshed with the second bevel gear, and one end of the third bevel gear away from the first bevel gear and the second bevel gear is fixedly connected to an adjusting rod.

Through the above technical solution, since the top of the third bevel gear is meshed with the first bevel gear, and the bottom of the third bevel gear is meshed with the second bevel gear, the end of the third bevel gear away from the first bevel gear and the second bevel gear is fixedly connected to the adjusting rod, so that the rotation of the third bevel gear can simultaneously drive the first bevel gear and the second bevel gear to rotate, the forward rotation of the third bevel gear can drive the first bevel gear and the second bevel gear to rotate forward, and the reverse rotation of the third bevel gear can drive the first bevel gear and the second bevel gear to reverse.

Furthermore, a slide rail is arranged on the outer side of the track, and the locking frame is composed of two baffles and a connecting plate, and the baffles are slidably connected to the slide rail.

Through the above technical solution, since a sliding rail is arranged on the outside of the track, the locking frame is composed of two baffles and a connecting plate, and the baffles are slidably connected to the sliding rail, so that when the baffles are all in the sliding rail, the expansion mechanism is completely retracted in the track, and the locking frame can lock the expansion mechanism.

Furthermore, the surgical forceps mechanism includes a clamp, a clamp body and a handle, the clamp is arranged at one end of the clamp body, and the handle is arranged at the other end of the clamp body, the handle can control the opening and closing of the clamp, a convex plate is fixedly connected to one side of the frame body, the clamp can clamp the convex plate, the clamp body passes through a connecting plate, and the connecting plate is slidably connected to the clamp body.

Through the above technical scheme, since the clamp is arranged at one end of the clamp body and the handle is arranged at the other end of the clamp body, the handle can control the opening and closing of the clamp, a convex plate is fixedly connected to one side of the frame body, the clamp can clamp the convex plate, the clamp body passes through the connecting plate, and the connecting plate is slidably connected to the clamp body, so that the handle can control the closing of the clamp to clamp the convex plate, that is, clamp the frame body, and the locking frame can slide on the clamp body, so that after the surgical clamp mechanism clamps the frame body, the locking frame can be pulled to release the lock of the locking frame on the expansion mechanism.

The beneficial effects of the present invention are as follows:

(1) In the present invention, the baffles are all in the slide rails, the expansion mechanism is all retracted in the rails, and the locking frame can lock the expansion mechanism. At this time, the second spring is in a compressed state, and the expansion plate is blocked by the rails and is completely stored in the first expansion plate and the second expansion plate. The first spring is compressed, and the top plate and the bottom plate can be stored at the top and bottom of the frame, thereby reducing the height of the frame before implantation. When the first spring is compressed, the upper vertical plate and the lower vertical plate are tightly attached, and the gap between the top plate and the bottom plate is the smallest. The upper locking hole and the lower locking hole are in the same horizontal plane, and the locking pin penetrates the upper locking hole and the lower locking hole at the same time, so that the auxiliary positioning mechanism is locked. At this time, the volume of the frame is the smallest, so that the frame can be implanted through a smaller incision, which helps to reduce surgical trauma and damage to surrounding tissues.

(2) In the present invention, after the frame reaches the predetermined position, the locking frame is pulled, so that the locking frame gradually releases the lock on the expansion mechanism, allowing the expansion mechanism to be deployed. After the expansion mechanism is deployed, the torsion spring drives the first expansion plate and the second expansion plate to be hinged at one end to expand toward both sides of the frame. At this time, the expansion plate leaves the track, and the second spring drives the expansion plate to expand naturally, thereby raising the height of the expansion mechanism. The expansion of the expansion mechanism increases the cross-sectional area of the frame, increases the contact area between the frame and the vertebrae, effectively improves the initial stability, and provides a wider surface for bone ingrowth, thereby promoting long-term bone fusion;

(3) In the present invention, the locking pin is disengaged from the upper locking hole and the lower locking hole as the expansion mechanism is expanded, so that the auxiliary positioning mechanism is also expanded, and the expansion mechanism drives the auxiliary positioning mechanism to expand. After the auxiliary positioning mechanism is expanded, the height of the frame is raised, and the frame is stuck between the vertebrae to lock the position of the frame, so as to prevent the position of the frame from changing due to operation errors and touching the frame, and avoid readjusting the position of the frame, thereby saving operation time and improving operation efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of an expandable fusion device for posterior lumbar fusion according to the present invention;

FIG2 is a schematic diagram of the overall structure of a frame of an expandable fusion device for posterior lumbar fusion according to the present invention;

FIG3 is a schematic structural diagram of an auxiliary positioning mechanism and an expansion mechanism of an expandable fusion device for posterior lumbar fusion surgery according to the present invention when they are deployed;

FIG4 is a schematic diagram of the exploded structure of an auxiliary positioning mechanism of an expandable fusion device for posterior lumbar fusion surgery according to the present invention when it is deployed;

FIG5 is a schematic structural diagram of an expansion mechanism of an expansion fusion device for posterior lumbar fusion surgery according to the present invention when it is deployed;

FIG6 is a schematic structural diagram of a secondary positioning mechanism and an expansion mechanism of an expandable fusion device for posterior lumbar fusion surgery according to the present invention when the expansion mechanism is contracted;

7 is a schematic diagram of the exploded structure of the auxiliary positioning mechanism of the expandable fusion device for posterior lumbar fusion of the present invention when it is contracted;

FIG8 is a schematic diagram of the exploded structure of an expansion mechanism of an expansion fusion device for posterior lumbar fusion surgery according to the present invention when it is contracted;

9 is a schematic structural diagram of a main positioning mechanism and an expansion mechanism of an expandable fusion device for posterior lumbar fusion according to the present invention;

FIG10 is a schematic diagram of the exploded structure of a main positioning mechanism of an expandable fusion device for posterior lumbar fusion according to the present invention;

FIG11 is a schematic structural diagram of a frame of an expandable fusion device for posterior lumbar fusion according to the present invention;

FIG12 is a partial enlarged view of the A portion of FIG11 of an expandable fusion device for posterior lumbar fusion according to the present invention;

13 is a schematic structural diagram of a locking frame and a surgical forceps mechanism of an expansion fusion device for posterior lumbar fusion according to the present invention;

FIG. 14 is a schematic diagram of the exploded structure of a locking frame and a surgical forceps mechanism of an expandable fusion device for posterior lumbar fusion surgery according to the present invention.

Figure numerals: 1, frame; 2, auxiliary positioning mechanism; 3, main positioning mechanism; 4, expansion mechanism; 5, locking frame; 6, surgical forceps mechanism; 11, track; 12, convex plate; 13, rotating shaft; 14, slide groove; 15, slide rail; 21, top plate; 22, bottom plate; 23, first spring; 211, upper vertical plate; 221, lower vertical plate; 2111, upper locking hole; 2211, lower locking hole; 31, upper positioning plate; 32, lower positioning plate ; 33. first bevel gear; 34. second bevel gear; 35. third bevel gear; 311. threaded rod; 321. threaded sleeve; 351. adjusting rod; 41. first expansion plate; 42. second expansion plate; 43. expansion plate; 44. torsion spring; 411. connecting sleeve; 412. locking pin; 421. sliding rod; 431. second spring; 51. baffle; 52. connecting plate; 61. clamp; 62. handle; 63. pliers body.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

As shown in Fig. 1-Fig. 2, an expansion fusion device for posterior lumbar fusion includes a frame 1, a secondary positioning mechanism 2, a main positioning mechanism 3, an expansion mechanism 4, a locking frame 5 and a surgical clamp mechanism 6. The main positioning mechanism 3 is slidably connected in the middle of the frame 1, the secondary positioning mechanism 2 is divided into two groups, the secondary positioning mechanisms 2 are symmetrically arranged on both sides of the main positioning mechanism 3, the secondary positioning mechanism 2 is slidably connected to the frame 1, the expansion mechanism 4 is symmetrically arranged on both sides of the frame 1, the locking frame 5 is horizontally slidably connected to both sides of the frame 1, and the surgical clamp mechanism 6 is arranged on one side of the frame 1;

There are six groups of expansion mechanisms 4, and the expansion mechanisms 4 are symmetrically arranged on both sides of the auxiliary positioning mechanism 2 and the main positioning mechanism 3;

The locking frame 5 can lock the expansion mechanism 4 to expand, and the expansion mechanism 4 can drive the auxiliary positioning mechanism 2 to expand;

The surgical forceps mechanism 6 can clamp the frame 1 , and the locking frame 5 is slidably connected to the surgical forceps mechanism 6 .

In this embodiment, when performing a posterior lumbar fusion surgery, the frame 1 is implanted into the intervertebral space through the surgical clamp mechanism 6. After the frame 1 reaches the predetermined position, the locking frame 5 is pulled so that the locking frame 5 gradually releases the lock on the expansion mechanism 4. After the expansion mechanism 4 is deployed, the cross-sectional area of the frame 1 is increased, and the contact area between the frame 1 and the intervertebral space is increased, which effectively improves the initial stability and provides a wider surface for bone growth, thereby promoting long-term bone fusion. The expansion mechanism 4 is deployed to drive the secondary positioning mechanism 2 to be deployed. After the secondary positioning mechanism 2 is deployed, the height of the frame 1 is increased, and the frame 1 is stuck between the vertebrae to lock the position of the frame 1 to prevent the position of the frame 1 from changing after the frame 1 is touched due to operational errors, and to avoid readjusting the position of the frame 1, thereby saving surgical time and improving surgical efficiency. Subsequently, the surgical clamp mechanism 6 can release the clamping of the frame 1, and then adjust the height of the main positioning mechanism 3 to restore the correct intervertebral space height. The height of the secondary positioning mechanism 2 can be adaptively adjusted with the height adjustment of the main positioning mechanism 3, and finally subsequent operations such as fixation can be performed.

As shown in FIGS. 2 to 8 , the auxiliary positioning mechanism 2 includes a top plate 21, a bottom plate 22 and a first spring 23. The top plate 21 is slidably connected to the top of the frame 1, and the bottom plate 22 is slidably connected to the bottom of the frame 1. The first spring 23 is fixedly connected between the top plate 21 and the bottom plate 22. There are four groups of first springs 23, and the first springs 23 are symmetrically arranged between the top plate 21 and the bottom plate 22. An upper vertical plate 211 is symmetrically fixedly connected to the front and rear sides of the bottom of the top plate 21, and a lower vertical plate 221 is symmetrically fixedly connected to the front and rear sides of the top of the bottom plate 22. An upper locking hole 2111 is arranged in the middle of the upper vertical plate 211, and a lower locking hole 2211 is arranged in the middle of the lower vertical plate 221. The upper locking hole 2111 and the lower locking hole 2211 can be in the same horizontal plane.

The expansion mechanism 4 includes a first expansion plate 41, a second expansion plate 42, an expansion plate 43 and a torsion spring 44. One end of the first expansion plate 41 is hinged to one end of the second expansion plate 42. A torsion spring 44 is provided at the hinge of the first expansion plate 41 and the second expansion plate 42. The expansion plates 43 are slidably connected to the top and bottom of the first expansion plate 41 and the second expansion plate 42.

The frame 1 is symmetrically provided with tracks 11 on both sides, the expansion mechanism 4 is provided in the track 11, the other end of the first expansion plate 41 is fixedly connected with a connecting sleeve 411, the track 11 is fixedly connected with a rotating shaft 13, the connecting sleeve 411 is rotatably connected to the rotating shaft 13, the other end of the second expansion plate 42 is fixedly connected with a sliding rod 421, a sliding groove 14 is provided in the track 11, the sliding rod 421 is slidably connected in the sliding groove 14, the expansion plate 43 is fixedly connected with a second spring 431, one end of the second spring 431 is fixedly connected in the first expansion plate 41 and the second expansion plate 42, and the other end of the second spring 431 is fixedly connected to the expansion plate 43;

A locking pin 412 is fixedly connected to the first expansion plate 41 . The locking pin 412 is disposed at one end of a hinge between the first expansion plate 41 and the second expansion plate 42 . The locking pin 412 can penetrate the upper locking hole 2111 and the lower locking hole 2211 at the same time.

In this embodiment, the first spring 23 is compressed, and the top plate 21 and the bottom plate 22 can be stored at the top and bottom of the frame 1, thereby reducing the height of the frame 1 before implantation. When the first spring 23 is compressed, the upper vertical plate 211 and the lower vertical plate 221 are tightly attached, and when the gap between the top plate 21 and the bottom plate 22 is the smallest, the upper locking hole 2111 and the lower locking hole 2211 are in the same horizontal plane;

When the expansion mechanism 4 completely enters the track 11, the expansion mechanism 4 is in a contracted state, at which time the second spring 431 is in a compressed state, and the expansion plate 43 is blocked by the track 11 and completely stored in the first expansion plate 41 and the second expansion plate 42. At this time, the auxiliary positioning mechanism 2 is contracted, and the locking pin 412 simultaneously penetrates the upper locking hole 2111 and the lower locking hole 2211, so that the auxiliary positioning mechanism 2 is locked;

After the expansion mechanism 4 is unfolded, the torsion spring 44 drives the first expansion plate 41 and the second expansion plate 42 to unfold to both sides of the frame 1 at one end. At this time, the expansion plate 43 leaves the track 11, and the second spring 431 drives the expansion plate 43 to unfold naturally, thereby increasing the height of the expansion mechanism 4. The unfolding of the expansion mechanism 4 increases the cross-sectional area of the frame 1.

At the same time, the locking pin 412 disengages from the upper locking hole 2111 and the lower locking hole 2211 as the expansion mechanism 4 expands, so that the auxiliary positioning mechanism 2 also expands, and the expansion mechanism 4 drives the auxiliary positioning mechanism 2 to expand. The locking pin 412 is not set on the expansion mechanism 4 corresponding to the main positioning mechanism 3.

As shown in Figures 9 to 11, the main positioning mechanism 3 includes an upper positioning plate 31, a lower positioning plate 32, a first bevel gear 33, a second bevel gear 34 and a third bevel gear 35. The upper positioning plate 31 is slidably connected to the top of the frame 1, the lower positioning plate 32 is slidably connected to the bottom of the frame 1, the first bevel gear 33 is rotatably connected to the top of the frame 1, the second bevel gear 34 is rotatably connected to the bottom of the frame 1, and the third bevel gear 35 is rotatably connected to one side of the first bevel gear 33 and the second bevel gear 34 in the frame 1;

A threaded rod 311 is fixedly connected to the bottom of the upper positioning plate 31, and the threaded rod 311 passes through the first bevel gear 33, and the threaded rod 311 is threadedly connected to the first bevel gear 33; a threaded sleeve 321 is fixedly connected to the top of the lower positioning plate 32, and the threaded sleeve 321 passes through the second bevel gear 34, and the threaded sleeve 321 is threadedly connected to the second bevel gear 34, and the threaded rod 311 can extend into the threaded sleeve 321;

The top of the third bevel gear 35 meshes with the first bevel gear 33 , and the bottom of the third bevel gear 35 meshes with the second bevel gear 34 . An end of the third bevel gear 35 away from the first bevel gear 33 and the second bevel gear 34 is fixedly connected to an adjustment rod 351 .

In this embodiment, the first bevel gear 33 can drive the upper positioning plate 31 to rise and fall by rotating, and the second bevel gear 34 can drive the lower positioning plate 32 to rise and fall by rotating. The first bevel gear 33 can drive the upper positioning plate 31 to rise by rotating forward, and the first bevel gear 33 can drive the upper positioning plate 31 to fall by reversing, and the second bevel gear 34 can drive the lower positioning plate 32 to fall by rotating forward, and the second bevel gear 34 can drive the lower positioning plate 32 to rise by reversing. The threaded rod 311 can extend into the threaded sleeve 321 so that the upper positioning plate 31 and the lower positioning plate 32 can be stored in the frame 1.

The rotation of the third bevel gear 35 can simultaneously drive the first bevel gear 33 and the second bevel gear 34 to rotate. The forward rotation of the third bevel gear 35 can drive the first bevel gear 33 and the second bevel gear 34 to rotate forward. The reverse rotation of the third bevel gear 35 can drive the first bevel gear 33 and the second bevel gear 34 to rotate reversely, so that the distance between the upper positioning plate 31 and the lower positioning plate 32 can be adjusted by rotating the third bevel gear 35, that is, the height of the main positioning mechanism 3 can be adjusted. A connecting groove is provided at one end of the adjusting rod 351, and the adjusting rod 351 can be driven to rotate by a tool, thereby driving the third bevel gear 35 to rotate.

As shown in FIG. 11 to FIG. 14 , a slide rail 15 is provided on the outer side of the track 11 , and the locking frame 5 is composed of two baffles 51 and a connecting plate 52 , and the baffles 51 are slidably connected to the slide rail 15 ;

The surgical forceps mechanism 6 includes a clamp 61, a clamp body 63 and a handle 62. The clamp 61 is arranged at one end of the clamp body 63, and the handle 62 is arranged at the other end of the clamp body 63. The handle 62 can control the opening and closing of the clamp 61. A convex plate 12 is fixedly connected to one side of the frame 1, and the clamp 61 can clamp the convex plate 12. The clamp body 63 passes through the connecting plate 52, and the connecting plate 52 is slidably connected to the clamp body 63.

In this embodiment, when the baffle 51 is completely in the slide rail 15, the expansion mechanism 4 is completely retracted in the track 11, the locking frame 5 can lock the expansion mechanism 4, the handle 62 can control the clamp 61 to close, so as to clamp the protruding plate 12, that is, clamp the frame 1, and the locking frame 5 can slide on the clamp body 63. After the surgical clamp mechanism 6 clamps the frame 1, the locking frame 5 can be pulled to release the lock of the locking frame 5 on the expansion mechanism 4.

Working principle:

During operation, when performing posterior lumbar fusion surgery, the baffle 51 is completely placed in the slide rail 15, the expansion mechanism 4 is completely retracted in the track 11, the locking frame 5 can lock the expansion mechanism 4, the handle 62 can control the clamp 61 to close so as to clamp the convex plate 12, that is, clamp the frame 1, and then the frame 1 is implanted into the intervertebral space through the surgical clamp mechanism 6;

At this time, the second spring 431 is in a compressed state, the expansion plate 43 is blocked by the track 11 and is completely stored in the first expansion plate 41 and the second expansion plate 42, the first spring 23 is in a compressed state, the top plate 21 and the bottom plate 22 can be stored at the top and bottom of the frame 1, and the height of the frame 1 before implantation is reduced. When the first spring 23 is compressed, the upper vertical plate 211 and the lower vertical plate 221 are tightly attached, and when the gap between the top plate 21 and the bottom plate 22 is the smallest, the upper locking hole 2111 and the lower locking hole 2211 are in the same horizontal plane, and the locking pin 412 penetrates the upper locking hole 2111 and the lower locking hole 2211 at the same time, so that the auxiliary positioning mechanism 2 is locked;

After the frame 1 reaches the predetermined position, the locking frame 5 is pulled, so that the locking frame 5 gradually releases the lock on the expansion mechanism 4, so that the expansion mechanism 4 can be expanded. After the expansion mechanism 4 is expanded, the torsion spring 44 drives the first expansion plate 41 and the second expansion plate 42 to expand toward both sides of the frame 1 at one end. At this time, the expansion plate 43 leaves the track 11, and the second spring 431 drives the expansion plate 43 to expand naturally, thereby increasing the height of the expansion mechanism 4. The expansion of the expansion mechanism 4 increases the cross-sectional area of the frame 1.

At the same time, the locking pin 412 is disengaged from the upper locking hole 2111 and the lower locking hole 2211 as the expansion mechanism 4 is expanded, so that the auxiliary positioning mechanism 2 is also expanded, and the expansion mechanism 4 is expanded to drive the auxiliary positioning mechanism 2 to expand;

After the auxiliary positioning mechanism 2 is unfolded, the height of the frame 1 is raised, and the frame 1 is stuck between the vertebrae to lock the position of the frame 1, so as to prevent the position of the frame 1 from changing due to the operation error and the readjustment of the position of the frame 1, thereby saving the operation time and improving the operation efficiency;

The surgical forceps mechanism 6 can release the clamping of the frame 1, and then the adjusting rod 351 can be driven to rotate by the tool, and then the third bevel gear 35 can be driven to rotate. The rotation of the third bevel gear 35 can simultaneously drive the first bevel gear 33 and the second bevel gear 34 to rotate. The forward rotation of the third bevel gear 35 can drive the first bevel gear 33 and the second bevel gear 34 to rotate forward, and the reverse rotation of the third bevel gear 35 can drive the first bevel gear 33 and the second bevel gear 34 to rotate reversely.

The first bevel gear 33 rotates forward to drive the upper positioning plate 31 to rise, and the first bevel gear 33 rotates backward to drive the upper positioning plate 31 to fall, and the second bevel gear 34 rotates forward to drive the lower positioning plate 32 to fall, and the second bevel gear 34 rotates backward to drive the lower positioning plate 32 to rise, so that the distance between the upper positioning plate 31 and the lower positioning plate 32 can be adjusted by rotating the third bevel gear 35, that is, the height of the main positioning mechanism 3 can be adjusted;

The correct intervertebral space height is restored by adjusting the height of the main positioning mechanism 3, and the height of the auxiliary positioning mechanism 2 can be adaptively adjusted along with the height adjustment of the main positioning mechanism 3, and finally subsequent operations such as fixation can be performed.

The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims (4)

1. The utility model provides a posterior lumbar fusion is with expanding fusion ware, includes framework (1), vice positioning mechanism (2), main positioning mechanism (3), expansion mechanism (4), locking frame (5) and operation pincers mechanism (6), its characterized in that, main positioning mechanism (3) sliding connection is in the middle of framework (1), vice positioning mechanism (2) are two sets of, vice positioning mechanism (2) symmetry set up in main positioning mechanism (3) both sides, vice positioning mechanism (2) sliding connection is on framework (1), expansion mechanism (4) symmetry set up in framework (1) both sides, locking frame (5) horizontal sliding connection is in framework (1) both sides, operation pincers mechanism (6) set up in framework (1) one side;

the expansion mechanisms (4) are six groups, and the expansion mechanisms (4) are correspondingly and symmetrically arranged at two sides of the auxiliary positioning mechanism (2) and the main positioning mechanism (3);

The locking frame (5) can lock the expansion mechanism (4) to be unfolded, and the expansion mechanism (4) can drive the auxiliary positioning mechanism (2) to be unfolded;

The surgical forceps mechanism (6) can clamp the frame body (1), and the locking frame (5) is in sliding connection with the surgical forceps mechanism (6);

The auxiliary positioning mechanism (2) comprises a top plate (21), a bottom plate (22) and first springs (23), wherein the top plate (21) is slidably connected above the frame body (1), the bottom plate (22) is slidably connected below the frame body (1), the first springs (23) are fixedly connected between the top plate (21) and the bottom plate (22), the first springs (23) are four groups, the first springs (23) are symmetrically arranged between the top plate (21) and the bottom plate (22), upper vertical plates (211) are symmetrically and fixedly connected to the front side and the rear side of the bottom of the top plate (21), lower vertical plates (221) are symmetrically and fixedly connected to the front side and the rear side of the top of the bottom plate (22), an upper lock hole (2111) is arranged in the middle of the upper vertical plates (211), a lower lock hole (2211) is arranged in the middle of the lower vertical plates (221), and the upper lock hole (2111) and the lower lock hole (2211) can be located in the same horizontal plane;

The expansion mechanism (4) comprises a first expansion plate (41), a second expansion plate (42), an expansion plate (43) and a torsion spring (44), one end of the first expansion plate (41) is hinged with one end of the second expansion plate (42), the torsion spring (44) is arranged at the hinged position of the first expansion plate (41) and the second expansion plate (42), and the top and the bottom of the first expansion plate (41) and the bottom of the second expansion plate (42) are both in sliding connection with the expansion plate (43);

The novel expansion device comprises a frame body (1), wherein rails (11) are symmetrically arranged on two sides of the frame body, an expansion mechanism (4) is arranged in the rails (11), a connecting sleeve (411) is fixedly connected to the other end of a first expansion plate (41), a rotating shaft (13) is fixedly connected to the inside of the rails (11), the connecting sleeve (411) is rotatably connected to the rotating shaft (13), a sliding rod (421) is fixedly connected to the other end of a second expansion plate (42), a sliding groove (14) is arranged in the rails (11), the sliding rod (421) is slidably connected to the sliding groove (14), a second spring (431) is fixedly connected to an expansion plate (43), one end of the second spring (431) is fixedly connected to the inside of the first expansion plate (41) and the inside of the second expansion plate (42), and the other end of the second spring (431) is fixedly connected to the expansion plate (43);

The first expansion plate (41) is fixedly connected with a lock needle (412), the lock needle (412) is arranged at one end of the hinge joint of the first expansion plate (41) and the second expansion plate (42), and the lock needle (412) can penetrate through the upper lock hole (2111) and the lower lock hole (2211) at the same time;

the outer side of the rail (11) is provided with a sliding rail (15), the locking frame (5) is composed of two baffles (51) and a connecting plate (52), and the baffles (51) are in sliding connection with the sliding rail (15);

Surgical forceps mechanism (6) are including anchor clamps (61), the pincers body (63) and handle (62), anchor clamps (61) set up in pincers body (63) one end, handle (62) set up in pincers body (63) other end, handle (62) can control anchor clamps (61) and open and close, framework (1) one side fixedly connected with flange (12), anchor clamps (61) can centre gripping flange (12), pincers body (63) run through connecting plate (52), connecting plate (52) and pincers body (63) sliding connection.

2. The expansion fusion device for posterior lumbar fusion according to claim 1, wherein the main positioning mechanism (3) comprises an upper positioning plate (31), a lower positioning plate (32), a first bevel gear (33), a second bevel gear (34) and a third bevel gear (35), the upper positioning plate (31) is slidably connected to the top of the frame body (1), the lower positioning plate (32) is slidably connected to the bottom of the frame body (1), the first bevel gear (33) is rotatably connected to the top in the frame body (1), the second bevel gear (34) is rotatably connected to the bottom in the frame body (1), and the third bevel gear (35) is rotatably connected to one side of the first bevel gear (33) and the second bevel gear (34) in the frame body (1).

3. The expansion fusion device for posterior lumbar fusion according to claim 2, wherein the bottom of the upper positioning plate (31) is fixedly connected with a threaded rod (311), the threaded rod (311) penetrates through the first bevel gear (33), the threaded rod (311) is in threaded connection with the first bevel gear (33), the top of the lower positioning plate (32) is fixedly connected with a threaded sleeve (321), the threaded sleeve (321) penetrates through the second bevel gear (34), the threaded sleeve (321) is in threaded connection with the second bevel gear (34), and the threaded rod (311) can extend into the threaded sleeve (321).

4. A posterior lumbar fusion cage according to claim 3, wherein the top of the third bevel gear (35) is engaged with the first bevel gear (33), the bottom of the third bevel gear (35) is engaged with the second bevel gear (34), and one end of the third bevel gear (35) far away from the first bevel gear (33) and the second bevel gear (34) is fixedly connected with an adjusting rod (351).