CN219048991U

CN219048991U - Intervertebral fusion device

Info

Publication number: CN219048991U
Application number: CN202220483782.9U
Authority: CN
Inventors: 冯世庆; 伊力扎提·伊力哈木; 迪力扎提·伊力哈木; 樊祥闯
Original assignee: Bangshi Technology Nanjing Co ltd
Current assignee: Bangshi Technology Nanjing Co ltd
Priority date: 2022-03-07
Filing date: 2022-03-07
Publication date: 2023-05-23
Anticipated expiration: 2032-03-07

Abstract

The utility model relates to the technical field of medical appliances, in particular to an interbody fusion cage which comprises a sliding disc and a fixed disc, wherein a first supporting rod, a second supporting rod, a third supporting rod and a fourth supporting rod which can be axially folded along the fixed disc are respectively hinged on the fixed disc along the circumferential interval, and the tail ends of the first supporting rod, the second supporting rod, the third supporting rod and the fourth supporting rod can form a rectangle. The utility model has reasonable and compact structure and convenient use, the device can be implanted into the preset position between vertebrae through the operation working channel with the diameter below 5mm, the operation of expanding the channel is not needed in the operation, the wound can be reduced, the separation of muscle tissues is reduced, and the operation time is greatly shortened by simple unfolding and fixing modes; a rectangular space is supported by all the supporting rods and the connecting rods, so that the bone grafting space is greatly increased, and the fusion rate is increased; in addition, after the device is implanted, the direct-view bone grafting operation under the mirror can be realized through an endoscope, so that accurate bone grafting and bone grafting quantity control can be performed.

Description

Intervertebral fusion device

Technical Field

The utility model relates to the technical field of medical appliances, in particular to an intervertebral fusion device.

Background

In the existing medical field, cervical vertebra vertebrotomy or discectomy is usually required for cervical vertebra intervertebral disc degeneration or traumatic protrusion, cervical vertebra trauma or degeneration instability, cervical vertebra tumor, infection and other diseases. Interbody bone fusion is required after removal of the vertebral bodies or discs to restore the integrity and stability of the cervical spine. Good interbody fusion results rely on the formation of a firm bony connection between the upper and lower vertebral bodies, i.e., bony fusion, rather than solely relying on grafts or fusion cage to provide support. Larger volume implants do not easily subside or become embedded in the vertebral body in the intervertebral space because implants with larger volumes easily conduct axial compressive stresses to the surrounding. So theoretically, the larger the volume of the fusion cage and the larger the contact area with the end plate, the larger the bone implantation amount, the stability between vertebral bodies can be improved, the subsidence can be prevented, and the fusion rate can be increased.

The Chinese patent document with publication number CN113662718A discloses an intervertebral fusion device, which is characterized by comprising a main body and a plurality of intervertebral fusion devices, wherein the main body is provided with an inner cavity, and the top and the bottom of the main body are respectively provided with an upper opening and a lower opening which are communicated with the inner cavity; the two support plates are respectively arranged at the upper opening and the lower opening, and are in sliding fit with the main body so as to be capable of being opened relative to the main body; and a spreader assembly comprising: the screw rod is rotatably arranged in the inner cavity along the first horizontal direction; the gear shafts are respectively positioned above and below the screw rod, each group of gear shafts comprises at least one gear shaft, the gear shafts are rotatably arranged in the inner cavity along a second horizontal direction perpendicular to the first horizontal direction, the gear shafts are provided with gears and pushing arms which are distributed at intervals along the second horizontal direction, the gears are meshed with the screw rod, and the pushing arms extend along the radial direction of the gear shafts; the intervertebral fusion device is configured to drive the two groups of gear shafts to synchronously rotate through rotation of the screw rod, and the pushing arms of the two groups of gear shafts respectively push the two support plates to move in the vertical direction relative to the main body. The two groups of gear shafts can be driven to synchronously rotate through the rotation of the adjusting screw, and the pushing arms of the two groups of gear shafts respectively push the two support plates to move in the vertical direction relative to the main body. But the opening direction is limited, and only the opening in the height direction can be realized.

The prior expandable interbody fusion cage has the problems that the expandable space is limited in the actual use process, and the interbody fusion cage needs to be implanted through a large channel, so that the real minimally invasive problem cannot be realized.

Disclosure of Invention

The utility model provides an intervertebral fusion device, which overcomes the defects of the prior art, and can effectively solve the problems that the expandable intervertebral fusion device has limited expandable space in the actual use process, and needs to be implanted into the intervertebral space through a large channel, and cannot realize real minimally invasive.

The technical scheme of the utility model is realized by the following measures: an intervertebral fusion device comprises a sliding disc and a fixed disc, wherein a first supporting rod, a second supporting rod, a third supporting rod and a fourth supporting rod which can be axially folded along the fixed disc are respectively hinged on the fixed disc along the circumferential interval, and the tail ends of the first supporting rod, the second supporting rod, the third supporting rod and the fourth supporting rod can form a rectangle; the middle part of the upper side of the fixed disc is fixedly provided with a fixed column, the outer side of the upper end of the fixed column is sleeved with a sliding disc, a fifth supporting rod, a sixth supporting rod, a seventh supporting rod and an eighth supporting rod which can be axially folded along the sliding disc are respectively hinged on the sliding disc corresponding to the positions of the first supporting rod, the second supporting rod, the third supporting rod and the fourth supporting rod, and the tail ends of the fifth supporting rod, the sixth supporting rod, the seventh supporting rod and the eighth supporting rod can form a rectangle; connecting rods are hinged between the fifth supporting rod and the first supporting rod, between the sixth supporting rod and the second supporting rod, between the seventh supporting rod and the third supporting rod, and between the eighth supporting rod and the fourth supporting rod, and a stable rectangular space can be supported after all the supporting rods, the connecting rods and the first supporting rod and the second supporting rod are unfolded; a locking mechanism is arranged between the fixed column and the sliding disc, and the inner side of the upper end of the fixed column is detachably connected with a handle with the upper end positioned above the sliding disc.

The following are further optimizations and/or improvements to the above-described inventive solution:

the fixing disc further comprises a first torsion spring and a second torsion spring, four first installation grooves with upward openings are formed in the upper side of the fixing disc at intervals along the circumference, a first supporting rod, a second supporting rod, a third supporting rod and a fourth supporting rod are hinged in each first installation groove through a first hinge shaft respectively, and the first torsion springs are arranged on the outer sides of the first hinge shafts corresponding to the positions among the first supporting rod, the second supporting rod, the third supporting rod, the fourth supporting rod and the corresponding first installation grooves; the lower side of the sliding disc corresponding to the position of each first mounting groove is provided with a second mounting groove with a downward opening, a fifth supporting rod, a sixth supporting rod, a seventh supporting rod and an eighth supporting rod are respectively hinged in each second mounting groove through a second hinge shaft, and second torsion springs are respectively arranged on the second hinge shafts corresponding to the positions among the fifth supporting rod, the sixth supporting rod, the seventh supporting rod, the eighth supporting rod and the corresponding second mounting grooves.

The locking mechanism can comprise a pin shaft, a gland and a spring, a first straight hole with a forward opening is arranged at the upper end of the fixed column, a second straight hole which is internally and externally communicated is arranged on the sliding disc corresponding to the first straight hole, and a pin shaft with the rear end positioned in the first straight hole is arranged in the second straight hole; the inner side of the front end of the second straight hole is fixedly provided with a gland sleeved on the outer side of the pin shaft through threads, the outer side of the pin shaft corresponding to the front side position of the first straight hole is provided with an outer ring table, and the outer side of the pin shaft corresponding to the position between the outer ring table and the gland is sleeved with a spring.

An anti-slip layer can be arranged on the outer side of the upper end of the handle.

The rectangular space may have a length of 15-20 mm, a width of 7-10 mm, and a height of 8-11 mm.

The utility model has reasonable and compact structure and convenient use, the device can be implanted into the preset position between vertebrae through the operation working channel with the diameter below 5mm, the operation of expanding the channel is not needed in the operation, the wound can be reduced, the separation of muscle tissues is reduced, and the operation time is greatly shortened by simple unfolding and fixing modes; a rectangular space is supported by all the supporting rods and the connecting rods, so that the bone grafting space is greatly increased, and the fusion rate is increased; in addition, after the device is implanted, the operation of direct-view bone grafting under the scope can be realized through an endoscope, so that the accurate bone grafting and the control of bone grafting quantity are realized.

Drawings

Fig. 1 is a schematic diagram of a front view of a preferred embodiment of the present utility model.

Fig. 2 is a schematic perspective view showing an expanded state of the preferred embodiment of the present utility model.

Fig. 3 is a schematic perspective view showing a folded state according to a preferred embodiment of the present utility model.

Fig. 4 is an enlarged perspective view of the connection state of the fixing plate and the fixing column in fig. 1.

Fig. 5 is an enlarged schematic view of the connection state of the locking mechanism in section A-A of fig. 1.

Fig. 6 is an enlarged perspective view of the connection state of the fourth strut and the fixed disc in fig. 1.

The codes in the drawings are respectively: 1 is a sliding disc, 2 is a fixed disc, 3 is a first supporting rod, 4 is a second supporting rod, 5 is a third supporting rod, 6 is a fourth supporting rod, 7 is a fixed column, 8 is a fifth supporting rod, 9 is a sixth supporting rod, 10 is a seventh supporting rod, 11 is an eighth supporting rod, 12 is a connecting rod, 13 is a handle, 14 is a first torsion spring, 15 is a second torsion spring, 16 is a first mounting groove, 17 is a first hinge shaft, 18 is a second mounting groove, 19 is a second hinge shaft, 20 is a pin shaft, 21 is a gland, 22 is a spring, 23 is a first straight hole, 24 is an outer ring table, and 25 is an anti-skid layer.

Detailed Description

The present utility model is not limited by the following examples, and specific embodiments can be determined according to the technical scheme and practical situations of the present utility model.

In the present utility model, for convenience of description, the description of the relative positional relationship of each component is described according to the layout manner of fig. 1 of the specification, for example: the positional relationship of the front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of the drawings of the specification.

The utility model is further described below with reference to examples and figures:

as shown in fig. 1, 2, 3, 4, 5 and 6, the interbody fusion cage comprises a sliding disc 1 and a fixed disc 2, wherein a first supporting rod 3, a second supporting rod 4, a third supporting rod 5 and a fourth supporting rod 6 which can be folded along the axial direction of the fixed disc 2 are respectively hinged on the fixed disc 2 at intervals along the circumference, and the tail ends of the first supporting rod 3, the second supporting rod 4, the third supporting rod 5 and the fourth supporting rod 6 can form a rectangle; the middle part of the upper side of the fixed disc 2 is fixedly provided with a fixed column 7, the outer side of the upper end of the fixed column 7 is sleeved with a sliding disc 1, a fifth supporting rod 8, a sixth supporting rod 9, a seventh supporting rod 10 and an eighth supporting rod 11 which can be folded along the axial direction of the sliding disc 1 are respectively hinged on the sliding disc 1 corresponding to the positions of the first supporting rod 3, the second supporting rod 4, the third supporting rod 5 and the fourth supporting rod 6, and the tail ends of the fifth supporting rod 8, the sixth supporting rod 9, the seventh supporting rod 10 and the eighth supporting rod 11 can form a rectangle; connecting rods 12 are hinged between the fifth supporting rod 8 and the first supporting rod 3, between the sixth supporting rod 9 and the second supporting rod 4, between the seventh supporting rod 10 and the third supporting rod 5, and between the eighth supporting rod 11 and the fourth supporting rod 6, and a stable rectangular space can be supported after all the supporting rods, the connecting rods 12 and the first supporting rod and the second supporting rod are unfolded; a locking mechanism is arranged between the fixed column 7 and the sliding disc 1, and a handle 13 with the upper end positioned above the sliding disc 1 is detachably connected to the inner side of the upper end of the fixed column 7. According to the requirement, all the supporting rods and the connecting rods 12 can support a rectangular space after being unfolded, the locking mechanism can effectively prevent the sliding disc 1 from sliding up and down to cause the deformation of the rectangular space, and the locking mechanism can be a spring bolt, a ball plunger with a spring and a buckle assembly which can realize automatic locking in the prior art; the handle 13 is convenient to detach, so that the fixing column 7 and the handle 13 can be detachably connected through threaded connection, ball plunger, rotary clamping connection and buckle connection.

When the intervertebral fusion device is ready to be placed after intervertebral treatment, the folded device is placed at a preset position through an operation working channel, a locking mechanism is unlocked through a forceps tip, then a handle 13 is held, the sliding disc 1 is pushed by the forceps tip to slowly slide down along the surface of the handle 13 until all struts and connecting rods 12 are fully unfolded and supported into a rectangular space, at the moment, the sliding disc 1 is sleeved outside the upper end of a fixed column 7, the sliding disc 1 is locked outside the upper end of the fixed column 7 through the locking mechanism, and finally the handle 13 is removed to finish implantation of the device; minimally invasive and accurate bone grafting can be performed according to the intervertebral height. The utility model has reasonable and compact structure, can be implanted into the preset position between vertebrae through the operation working channel with the diameter below 5mm, does not need to enlarge the channel in operation, can reduce wounds and muscle tissue separation, has simple unfolding and fixing modes and greatly shortens the operation time; a rectangular space is supported by all the supporting rods and the connecting rods 12, so that the bone grafting space is greatly increased, and the fusion rate is increased; in addition, after the device is implanted, the operation of direct-view bone grafting under the scope can be realized through an endoscope, and the accurate bone grafting and the bone grafting quantity control can be performed.

The interbody fusion cage can be further optimized or/and improved according to actual needs:

as shown in fig. 1, 2, 3, 4 and 6, the fixing plate further comprises a first torsion spring 14 and a second torsion spring 15, four first installation grooves 16 with upward openings are arranged on the upper side of the fixing plate 2 at intervals along the circumference, a first support rod 3, a second support rod 4, a third support rod 5 and a fourth support rod 6 are respectively hinged in each first installation groove 16 through a first hinge shaft 17, and the first torsion springs 14 are arranged on the outer sides of the first hinge shafts 17 corresponding to the positions among the first support rod 3, the second support rod 4, the third support rod 5, the fourth support rod 6 and the corresponding first installation grooves 16; the lower side of the sliding disc 1 corresponding to the position of each first mounting groove 16 is provided with a second mounting groove 18 with a downward opening, each second mounting groove 18 is respectively hinged with a fifth supporting rod 8, a sixth supporting rod 9, a seventh supporting rod 10 and an eighth supporting rod 11 through a second hinge shaft 19, and second torsion springs 15 are respectively arranged on the second hinge shafts 19 corresponding to the positions between the fifth supporting rod 8, the sixth supporting rod 9, the seventh supporting rod 10, the eighth supporting rod 11 and the corresponding second mounting grooves 18.

By the arrangement, the first mounting groove 16 and the second mounting groove 18 can enable the maximum unfolding angle of all the struts to be 90 degrees after being unfolded, and limit the unfolding angle of all the struts; by arranging the first torsion spring 14 and the second torsion spring 15, the unfolding speed of all the supporting rods can be increased, the extrusion resistance of the rectangular space is enhanced, and the rectangular space can be better prevented from being extruded and deformed; in addition, by arranging the first mounting groove 16 and the second mounting groove 18, after all the supporting rods and the connecting rods 12 are folded and folded, the maximum outer diameter of the device is the maximum outer diameter of the fixed disc 2 or the sliding disc 1, so that the maximum radial dimension of the folded device can be better designed and controlled, and the device can be implanted into the preset position between the vertebrae through a smaller operation channel.

As shown in fig. 2, 3 and 5, the locking mechanism comprises a pin shaft 20, a gland 21 and a spring 22, a first straight hole 23 with a forward opening is arranged at the upper end of the fixed column 7, a second straight hole which is internally and externally communicated is arranged on the sliding disc 1 corresponding to the position of the first straight hole 23, and the pin shaft 20 with the rear end positioned in the first straight hole 23 is arranged in the second straight hole; the inner side of the front end of the second straight hole is fixedly provided with a gland 21 sleeved on the outer side of the pin shaft 20 through threads, the outer side of the pin shaft 20 corresponding to the front side of the first straight hole 23 is provided with an outer ring table 24, and the outer side of the pin shaft 20 corresponding to the position between the outer ring table 24 and the gland 21 is sleeved with a spring 22.

Through the arrangement, after the first supporting rod 3, the second supporting rod 4, the third supporting rod 5, the fourth supporting rod 6, the fifth supporting rod 8, the sixth supporting rod 9, the seventh supporting rod 10, the eighth supporting rod 11 and all the connecting rods 12 are unfolded to form a rectangular space, the inner end of the pin shaft 20 can be inserted into the first straight hole 23 under the action of the pre-tightening force of the spring, so that the sliding disc 1 can be prevented from sliding up and down, and further the rectangular space is prevented from being extruded and deformed; the gland 21 prevents the spring 22 and pin 20 from backing out of the second straight bore. The spring 22 may be a compression spring, a combination compression spring or a combination disc spring in the prior art according to requirements; after the device is folded, locking grooves can be arranged at corresponding positions on the handle 13 so as to prevent the device from being automatically unfolded under the action of the spring force of the first torsion spring 14 and the second torsion spring 15; the outer end of the gland 21 can be further provided with a wrench groove for convenient installation, and the outer end of the pin shaft 20 can be provided with a thread wrench groove with an outward opening for convenient unlocking by using a wrench under the condition that the locking mechanism is blocked.

As shown in fig. 1, 2 and 3, an anti-slip layer 25 is arranged on the outer side of the upper end of the handle 13. According to the requirement, in order to prevent slipping when the handle 13 is grasped, an embossing or knurling anti-slip layer, a frosted anti-slip layer and a soft rubber anti-slip material anti-slip layer can be arranged on the outer side of the upper end of the handle 13.

As shown in fig. 1, 2 and 3, the rectangular space has a length of 15-20 mm, a width of 7-10 mm and a height of 8-11 mm. Through setting up like this, can set up a series of space size different this device, conveniently use the not unidimensional this device to different patients.

The technical characteristics form the optimal embodiment of the utility model, have stronger adaptability and optimal implementation effect, and can increase or decrease unnecessary technical characteristics according to actual needs so as to meet the requirements of different situations.

Claims

1. The intervertebral fusion device is characterized by comprising a sliding disc and a fixed disc, wherein a first supporting rod, a second supporting rod, a third supporting rod and a fourth supporting rod which can be axially folded along the fixed disc are respectively hinged on the fixed disc along the circumferential interval, and the tail ends of the first supporting rod, the second supporting rod, the third supporting rod and the fourth supporting rod can form a rectangle; the middle part of the upper side of the fixed disc is fixedly provided with a fixed column, the outer side of the upper end of the fixed column is sleeved with a sliding disc, a fifth supporting rod, a sixth supporting rod, a seventh supporting rod and an eighth supporting rod which can be axially folded along the sliding disc are respectively hinged on the sliding disc corresponding to the positions of the first supporting rod, the second supporting rod, the third supporting rod and the fourth supporting rod, and the tail ends of the fifth supporting rod, the sixth supporting rod, the seventh supporting rod and the eighth supporting rod can form a rectangle; connecting rods are hinged between the fifth supporting rod and the first supporting rod, between the sixth supporting rod and the second supporting rod, between the seventh supporting rod and the third supporting rod, and between the eighth supporting rod and the fourth supporting rod, and a stable rectangular space can be supported after all the supporting rods, the connecting rods and the first supporting rod and the second supporting rod are unfolded; a locking mechanism is arranged between the fixed column and the sliding disc, and the inner side of the upper end of the fixed column is detachably connected with a handle with the upper end positioned above the sliding disc.

2. The interbody fusion cage according to claim 1, further comprising a first torsion spring and a second torsion spring, wherein four first installation grooves with upward openings are arranged on the upper side of the fixed disc at intervals along the circumference, a first support rod, a second support rod, a third support rod and a fourth support rod are respectively hinged in each first installation groove through a first hinge shaft, and the first torsion springs are arranged on the outer sides of the first hinge shafts corresponding to the positions among the first support rod, the second support rod, the third support rod, the fourth support rod and the corresponding first installation grooves; the lower side of the sliding disc corresponding to the position of each first mounting groove is provided with a second mounting groove with a downward opening, a fifth supporting rod, a sixth supporting rod, a seventh supporting rod and an eighth supporting rod are respectively hinged in each second mounting groove through a second hinge shaft, and second torsion springs are respectively arranged on the second hinge shafts corresponding to the positions among the fifth supporting rod, the sixth supporting rod, the seventh supporting rod, the eighth supporting rod and the corresponding second mounting grooves.

3. The interbody fusion cage according to claim 1 or 2, wherein the locking mechanism comprises a pin shaft, a gland and a spring, a first straight hole with a forward opening is arranged at the upper end of the fixed column, a second straight hole which is internally and externally communicated is arranged on the sliding disc corresponding to the first straight hole, and a pin shaft with a rear end positioned in the first straight hole is arranged in the second straight hole; the inner side of the front end of the second straight hole is fixedly provided with a gland sleeved on the outer side of the pin shaft through threads, the outer side of the pin shaft corresponding to the front side position of the first straight hole is provided with an outer ring table, and the outer side of the pin shaft corresponding to the position between the outer ring table and the gland is sleeved with a spring.

4. An intervertebral fusion device as recited in claim 1 or claim 2 wherein an anti-slip layer is provided on the outside of the upper end of the handle.

5. An intersomatic cage according to claim 3, wherein the upper outer side of the handle is provided with an anti-slip layer.

6. An intersomatic cage according to claim 1 or 2, wherein the rectangular space has a length of 15-20 mm, a width of 7-10 mm and a height of 8-11 mm.

7. An intersomatic cage according to claim 3, wherein the rectangular space has a length of 15-20 mm, a width of 7-10 mm and a height of 8-11 mm.

8. The interbody fusion cage of claim 4, wherein the rectangular space is 15-20 mm in length, 7-10 mm in width, and 8-11 mm in height.

9. The interbody fusion cage of claim 5, wherein the rectangular space is 15-20 mm in length, 7-10 mm in width, and 8-11 mm in height.