CN111973323A

CN111973323A - Supporting device of minimally invasive fusion cage

Info

Publication number: CN111973323A
Application number: CN202010599740.7A
Authority: CN
Inventors: 陈琼威; 刘载淳; 张鹏云; 吕世文
Original assignee: NINGBO HICREN BIOTECHNOLOGY CO LTD
Current assignee: NINGBO HICREN BIOTECHNOLOGY CO LTD
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2020-11-24

Abstract

The invention discloses a matching device of a minimally invasive fusion cage, which comprises: the bone grafting unit, the rotary handle unit, the grab handle unit and the clamping unit; the grab handle unit comprises a grab handle shell, an inner shell fixed in the grab handle shell, a sliding block positioned in the inner shell and a screw rod; the near end of the screw rod is fixedly connected with the rotary handle block, and the far end of the screw rod is inserted into the near end of the inner shell and can be axially and rotatably fixed in the inner shell; the near end of the sliding block is in threaded connection with the far end of the screw rod; the clamping unit comprises a clamping pipe, a clamping pipe head, an outer pipe and an outer pipe head fixedly connected with the near end of the outer pipe; the outer tube is sleeved outside the clamping tube, the near end of the clamping tube is fixedly connected with the far end of the sliding block, and the far end of the clamping tube is fixedly connected with the near end of the fusion device through the matching of the outer tube; the far end of the bone grafting tube passes through the rotary handle, the screw rod and the clamping tube to be connected with the far end of the fusion cage through threads. The device integrates implantation, molding and bone grafting of the fusion device, so that minimally invasive fusion operation is simpler and more convenient, and the safety and the effectiveness of the operation are improved.

Description

Supporting device of minimally invasive fusion cage

Technical Field

The invention relates to the field of medical instruments, in particular to a matching device of a minimally invasive fusion cage.

Background

The spinal fusion operation has better curative effect on the aspect of treating the neck and back pain and the unstable neck and back vertebrae, and is a conventional operation mode for treating degenerative disc diseases, spondylolisthesis and segmental instability of the spine.

Along with the development of medical science, the fusion operation is rapidly developed under the minimally invasive channel at present, patent CN101288608B discloses a small incision sneak type intervertebral bone grafting device, which comprises a bone grafting coat 2 of a bone grafting working channel 1, an intervertebral disc file 3 and a core bone grafting device 4, wherein the intervertebral disc file 3 and the core bone grafting device 4 are respectively matched with the bone grafting working channel on the bone grafting coat and can move along the bone grafting working channel, and the core bone grafting device consists of a bone grafting sleeve 5 and a bone grafting push rod 6 in sliding fit with the bone grafting sleeve. The device can only be used for bone grafting, and cannot generate auxiliary effects on the operations of fusion device implantation, fusion device molding and the like. Patent US20160367294a1 discloses an apparatus for placing an implant at a target site to enhance posterolateral fusion between two or more vertebrae, the apparatus comprising: a housing, an actuatable trigger associated with the housing, a curved rigid access tube extending from the housing, the access tube terminating in a distal end; a sheath disposed about and movable relative to the access tube; a transmission disposed in the housing; in an initial state, the sheath extends distally beyond the distal end of the access tube where a space is defined within the sheath to accommodate a graft, implant and/or graft material. Wherein upon actuation of the trigger, the transmission causes incremental displacement of the sheath relative to the distal end of the access tube. The structure is complex, and has limited auxiliary effect on the operations of implanting the fusion cage, forming the fusion cage and the like.

The conventional minimally invasive spine interbody fusion operation comprises three steps of fusion cage implantation, fusion cage forming and bone grafting, different tools need to be replaced in the operation, and the three steps cannot be completed by adopting a unified device in the prior art.

Therefore, the integration of the functions of fusion device implantation, fusion device molding and bone grafting is integrated, so that minimally invasive fusion operation is simpler and more convenient, the safety and the effectiveness of the operation are improved, and the device is an important research direction.

Disclosure of Invention

The present invention has been made to solve the above-mentioned problems occurring in the prior art.

The invention provides a matching device of a minimally invasive fusion cage, which comprises:

the bone grafting unit comprises a bone grafting handle and a bone grafting tube, wherein the bone grafting handle is sleeved at the near end of the bone grafting tube, and the bone grafting handle moves a certain distance relative to the bone grafting tube along the axial direction to switch between non-rotatable matching and rotatable matching;

the rotary handle unit comprises a rotary handle and a rotary handle block fixed in the rotary handle; the bone grafting handle is connected with the near end of the rotary handle in a buckling manner;

the grab handle unit comprises a grab handle shell, an inner shell fixed in the grab handle shell and a sliding block positioned in the inner shell; the handle rotating block is fixedly connected with the near end of the screw rod, and the far end of the screw rod is inserted into the near end of the inner shell and can be fixed in the inner shell in a circumferential rotating manner; the near end of the sliding block is in threaded connection with the far end of the screw rod;

the clamping unit comprises a clamping pipe, a clamping pipe head, an outer pipe and an outer pipe head fixedly connected with the near end of the outer pipe; the outer tube is sleeved outside the clamping tube, the near end of the clamping tube is fixedly connected with the far end of the sliding block, and the far end of the clamping tube is fixedly connected with the near end of the fusion cage through the matching of the outer tube; the far end of the bone grafting tube penetrates through the rotary handle, the screw rod, the clamping tube and the far end of the fusion cage to be in threaded connection.

Preferably, two arc-shaped parts extend out of the proximal end of the sliding block, and the inner surfaces of the arc-shaped parts are matched with the threads on the outer surface of the screw rod; a limiting block is positioned in the two arc-shaped parts, the limiting block is provided with a pore passage, and the bone grafting tube penetrates through the pore passage; the limiting block radially extends two protruding parts to penetrate through a gap between the two arc-shaped parts to be inserted into a clamping groove formed in the inner shell.

Preferably, a circle of bulges are arranged on the outer surface of the bone grafting tube, and the far end surfaces of the bulges are attached to the near end surfaces of the limiting blocks; the outer diameter of the protrusion is larger than the inner diameter of the pore passage.

Preferably, the clamping tube head is fixed on the outer surface of the clamping tube, the outer tube head is sleeved on the outer surface of the clamping tube head, and the clamping tube head can move axially relative to the outer tube head; the outer surface of the clamping tube head is provided with threads matched with the threads on the inner surface of the outer tube head.

Preferably, the far end of the clamping pipe is circumferentially provided with a chute and a platform, and the far end of the clamping pipe is also provided with a plurality of axial grooves; after the near end of the fusion cage is inserted into the far end of the clamping tube, the outer tube is moved until the far end of the outer tube is flush with the far end of the clamping tube, and the connection between the near end of the fusion cage and the clamping tube is stabilized.

Preferably, a hexagonal limiting block extends out of the outer surface of the proximal end of the bone grafting tube, a limiting cavity matched with the hexagonal limiting block is arranged in the bone grafting handle, a rotating cavity extends out of the proximal end of the limiting cavity, and the rotating cavity is communicated with the outside through an opening in the proximal end of the bone grafting handle; when the hexagon stopper is located spacing cavity, plant the bone handle with the nonrotatable cooperation of bone grafting pipe, when the hexagon stopper is located rotatory cavity, plant the bone handle with the rotatable cooperation of bone grafting pipe.

Preferably, the bone grafting unit further comprises a bone grafting funnel and a bone grafting rod, the distal end of the bone grafting funnel is in threaded fit with the proximal end of the bone grafting tube, and the bone grafting rod pushes filling materials in the bone grafting funnel into the bone grafting tube to reach the inside of the fusion cage.

Preferably, the handle unit further comprises a stop block, and the stop block is connected with the proximal end of the inner shell in a threaded fit manner; the screw rod passes the stop block and enters the inner shell, a circle of fixing part extends from the outer surface of the screw rod close to the stop block, and the fixing part is clamped between the inner shell and the stop block.

Preferably, the outer tube has an outer tube diameter of less than 7 mm.

Preferably, the diameter of the cross section of the bone grafting rod is less than or equal to the minimum inner diameter of the bone grafting funnel or the inner diameter of the bone grafting tube

By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:

(1) the invention realizes the integration of the functions of the fusion device implantation, the fusion device molding and the bone grafting through the combined design of the bone grafting unit, the rotary handle unit, the grab handle unit and the clamping unit, so that the minimally invasive fusion operation is simpler and more convenient, and the safety and the effectiveness of the operation are improved;

(2) the limiting block, the sliding block with the arc part and the inner shell with the clamping groove are matched to carry out circumferential limiting and axial limiting, and the clamping pipe is matched with the outer pipe to be fixed with the near end of the fusion device, so that circumferential and axial movement of the fusion device can be limited, and the limiting design greatly improves the operation safety of the device;

(3) the fusion cage matching device provided by the invention can meet the requirement of matching minimally invasive fusion cage implantation through an operation working channel with the diameter of below 7mm, and has small harm to patients.

Drawings

FIG. 1 is a schematic structural view of a minimally invasive fusion cage kit according to the present invention;

FIG. 2 is a cross-sectional view of a device for minimally invasive fusion;

FIG. 3 is a schematic view of a handle unit structure according to the present invention;

FIG. 4 is a loose view of the stem and the stem of the present invention;

FIG. 5 is a close-fitting view of the bone grafting tube and the bone grafting handle according to the present invention;

FIG. 6 is a schematic view of the clamping tube and the fusion cage of the present invention in combination;

FIG. 7 is a schematic view of the process of fitting the outer tube and the clamp tube according to the present invention;

FIG. 8 is a schematic view of the fitting structure of the outer tube and the clamping tube according to the present invention;

FIG. 9 is a schematic view of the process of rotating the stem according to the present invention;

FIG. 10 is a schematic view of the axial limiting of the bone grafting tube by the limiting block according to the present invention;

FIG. 11 is a schematic view illustrating a process of non-rotatable engagement and rotatable engagement of a stem and a tube according to the present invention;

FIG. 12 is a schematic view illustrating a process of the present invention in which a bone grafting stem is rotatably engaged with a bone grafting tube;

FIG. 13 is a diagram of the process of forming the rotary-handle fusion apparatus of the present invention;

FIG. 14 is a schematic view of a connection structure of a bone grafting funnel and a bone grafting tube according to the present invention;

FIG. 15 is a schematic view of the process of clamping the cage by the clamping unit according to the present invention;

fig. 16 is a schematic view of a bone grafting rod according to the present invention.

The symbols in the drawings indicate the description:

1-bone grafting unit, 2-rotary handle unit, 3-handle unit, 4-clamping unit, 5-bone grafting handle, 6-bone grafting tube, 7-rotary handle, 8-rotary handle block, 9-handle shell, 10-inner shell, 11-stop block, 12-slide block, 13-screw rod, 14-stop block, 15-clamping tube, 16-outer tube, 17-clamping tube head, 18-outer tube head, 19-bone grafting funnel, 20-fusion device and 21-bone grafting rod.

Detailed Description

The proximal end of the present invention refers to the end close to the operator, and the distal end refers to the end far from the operator. Both clockwise and counterclockwise are positions relative to the operator.

With the development of medical science, the fusion operation performed under the minimally invasive channel is rapidly developed at present, and the matching device of the minimally invasive fusion device can help the minimally invasive fusion device to smoothly enter the intervertebral disc through the minimally invasive channel and to be molded and implanted with bone, so that the minimally invasive fusion operation is simpler and more convenient to operate.

The invention provides a matching device of a minimally invasive fusion cage, as shown in figures 1-2, comprising:

the bone grafting unit 1 comprises a bone grafting handle 5 and a bone grafting tube 6, wherein the bone grafting handle 5 is sleeved at the near end of the bone grafting tube 6, and the bone grafting handle 5 axially moves for a certain distance relative to the bone grafting tube 6 to switch between non-rotatable matching and rotatable matching;

a rotary handle unit 2, which comprises a rotary handle 7 and a rotary handle block 8 fixed in the rotary handle 7; the bone grafting handle 5 is connected with the near end of the rotary handle 7 in a buckling way;

a grip unit 3 including a grip housing 9, an inner housing 10 fixed in the grip housing 9, a slider 12 positioned in the inner housing 10, and a screw 13; the proximal end of the screw 13 is fixedly connected with the handle block 8, and the distal end of the screw 13 is inserted into the proximal end of the inner shell 10 and is fixed in the inner shell 10 in a manner of circumferential rotation; the near end of the sliding block 12 is in threaded connection with the far end of the screw rod 13;

the clamping unit 4 comprises a clamping pipe 15, a clamping pipe head 17, an outer pipe 16 and an outer pipe head 18 fixedly connected with the near end of the outer pipe 16; an outer tube 16 is sleeved outside the clamping tube 15, the near end of the clamping tube 15 is fixedly connected with the far end of the sliding block 12, and the far end of the clamping tube 15 is fixedly connected with the near end of the fusion cage 20 through the matching of the outer tube 16; the distal end of the bone grafting tube 6 passes through the rotary handle 7, the screw rod 13 and the clamping tube 15 to be connected with the distal end of the fusion device 20 in a threaded manner.

In one specific embodiment, as shown in fig. 3 and 10, the proximal end of the slider 12 extends with two arcs, the inner surfaces of the arcs are engaged with the threads on the outer surface of the screw 13; a limiting block 14 is positioned in the two arc-shaped parts, the limiting block 14 is provided with a pore passage, and the bone grafting tube 6 passes through the pore passage; the limiting block 14 extends two protrusions along the radial direction to penetrate through the gap between the two arc-shaped parts and be inserted into a clamping groove arranged on the inner shell 10.

The clamping groove and the limiting block 14 are matched to limit the circular motion of the sliding block 12, and the clamping groove limits the circular rotation and radial movement of the sliding block 12.

In a preferred embodiment, as shown in fig. 10, the outer surface of the bone grafting tube 6 is provided with a circle of protrusions, and the distal end surfaces of the protrusions are attached to the proximal end surface of the limiting block 14; the outer diameter of the protrusion is larger than the inner diameter of the pore passage. Further, the outer diameter of the projection is smaller than the inner diameter of the screw 13. The stopper 14 limits the axial movement distance of the bone grafting tube 6.

In one particular embodiment, as shown in FIG. 12, a clamping tip 17 is secured to the outer surface of the clamping tube 15; the outer surface of the clamping pipe head 17 is sleeved with an outer pipe head 18, and the clamping pipe head 17 can axially move relative to the outer pipe head 18; the outer surface of clamping head 17 is provided with threads that mate with threads on the inner surface of outer tube head 18. Further, the holding tip 17 and the holding tube 15 may be integrally formed, and the outer tube 16 and the outer tip 18 may be integrally formed.

In a specific embodiment, as shown in fig. 6, the far end of the clamping tube 15 is circumferentially provided with a chute and a platform, and the far end of the clamping tube 15 is also provided with a plurality of axial grooves; after the proximal end of the fusion cage 20 is inserted into the distal end of the holding tube 15, the outer tube 16 is moved until the distal end of the outer tube 16 is flush with the distal end of the holding tube 15, securing the proximal end of the fusion cage 20 to the holding tube 15.

Further, the outer diameter of the proximal port of the fusion cage 20 is larger than the inner diameter of the distal port of the clamping tube 15, and the distal portion of the clamping tube 15 is provided with a plurality of axial grooves, so that the distal end of the clamping tube can be slightly unfolded, and the proximal end of the fusion cage 20 is inserted into the distal end of the clamping tube 15; as shown in fig. 7, outer tip 18 is moved distally, causing outer tube 16 to move distally until the threads on the inner surface of outer tip 18 mate with the threads on the outer surface of retaining tip 17, rotating outer tip 18 until the distal surface of outer tube 16 is flush with the distal surface of retaining tube 15. Since the inner diameter of the outer tube 16 matches the outer diameter of the clamping tube 15, and the distal end surface of the outer tube is flush with the distal end surface of the clamping tube, the distal end portion of the outer tube 16 has a force directed into the tube toward the distal end portion of the clamping tube 15 that is slightly expanded, so that the distal end of the clamping tube 15 clamps the proximal end of the fusion device 20, and the distal end of the clamping tube 15 is connected to the proximal end of the fusion device 20. Circumferential and axial movement of the cage is limited by the engagement of the gripping tube 15 and outer tube 16 with the proximal end of the cage 20. Axial movement of outer tube 16 and clamping tube 15 is limited by the mating of the threads on the inner surface of outer tube head 18 with the threads on the outer surface of clamping tube head 17.

In a specific embodiment, as shown in fig. 4-5, a hexagonal stopper extends from the outer surface of the proximal end of the bone grafting tube 6, a stopper cavity matching with the hexagonal stopper is provided in the bone grafting stem 5, a rotation cavity extends from the proximal end of the stopper cavity, and the rotation cavity is communicated with the outside through an opening at the proximal end of the bone grafting stem 5. As shown in fig. 5, when the hexagonal limiting block is located in the limiting cavity, the bone grafting stem 5 cannot rotate relative to the bone grafting tube 6, i.e. cannot be matched with the bone grafting tube in a rotating manner; as shown in fig. 4, when the hexagonal stopper is located in the rotation cavity, the stem 5 can rotate relative to the bone grafting tube 6, i.e. can be rotatably matched.

In a specific embodiment, as shown in fig. 14, the bone grafting unit 1 further comprises a bone grafting funnel 19 and a bone grafting rod 21, wherein the distal end of the bone grafting funnel 19 is in threaded fit with the proximal end of the bone grafting tube 6, and the bone grafting rod 21 pushes the filling material in the bone grafting funnel 19 into the bone grafting tube 6 to reach the interior of the fusion cage 20. As shown in fig. 16, the bone grafting stem 21, which is an elongated stem having a cross-sectional diameter less than or equal to the minimum inner diameter of the bone grafting funnel 19 or the inner diameter of the bone grafting tube 6, helps the operator push bone filler from the bone grafting funnel 19 into the bone grafting tube 6 to the inside of the fusion cage 20 during the bone grafting operation.

In a specific embodiment, as shown in fig. 10, the grip unit 3 further includes a stopper 11, and the stopper 11 is connected to the proximal end of the inner housing 10 by screw-fitting; the screw 13 passes through the stop block 11 and enters the inner shell 10, a circle of fixing part extends from the outer surface of the screw 13 close to the stop block 11, and the fixing part is clamped between the inner shell 10 and the stop block 11. The inner housing 10 and the stop 11 cooperate to limit the screw 13 from moving axially relative to the inner housing 10, and the screw 13 is rotatable circumferentially relative to the inner housing 10 and the stop 11.

In a specific embodiment, the outer tube 16 has an outer tube diameter of less than 7mm

The specific use method of the device comprises the following steps:

s1: clamping the fusion cage 20: as shown in fig. 6-8, the proximal end of fusion device 20 is inserted into the distal end of holding tube 15, outer tip 18 is moved distally until the threads on the inner surface of outer tip 18 mate with the threads on the outer surface of holding tip 17, and outer tip 18 is rotated until the distal surface of outer tube 16 is flush with the distal surface of holding tube 15;

s2: the bone grafting tube 6 is fixedly connected with the fusion cage 20: the distal end of the bone grafting tube 6 passes through the rotary handle 7, the screw 13, the limiting block 14 and the clamping tube 15 to enter the fusion cage 20, as shown in fig. 9, the bone grafting tube 6 is in non-rotatable fit with the bone grafting handle 5, the bone grafting handle 5 is rotated clockwise, the distal end of the bone grafting tube 6 is fixedly connected with the distal end of the fusion cage 20 through threads until the protrusion on the bone grafting tube 6 is attached to the limiting block 14, as shown in fig. 10;

s3: and (3) forming the fusion device 20: as shown in fig. 11, the bone grafting stem 5 is pressed downwards until the bone grafting stem 5 is attached to the rotary stem 7, at this time, the bone grafting stem 5 is rotatably matched with the bone grafting tube 6, the bone grafting stem 5 is rotated until being fixed with the rotary stem 7 through snap fit, after the fusion cage 20 enters into the intervertebral space along the working sleeve by holding the handle shell 9, the rotary stem 7 is rotated clockwise, as shown in fig. 13, the slide block 12 drives the clamping unit 4 to advance towards the far end, and the support of the fusion cage 20 is spread and molded under the limit of the far end of the bone grafting tube 6;

s4: bone grafting: as shown in fig. 14, the bone grafting funnel 19 is screw-fitted to the proximal end of the bone grafting tube 6, the bone grafting rod 21 pushes the filling material in the bone grafting funnel 19 into the bone grafting tube 6 to reach the interior of the fusion cage 20, and the fusion cage 20 completes bone grafting;

s5: a taking-out device: rotating the bone grafting handle 5 to separate from the rotating handle 7, as shown in fig. 12, pulling the bone grafting handle 5 upwards, rotating the proximal ends of the bone grafting handle 5 and the bone grafting tube 6 from rotatable fit to non-rotatable fit, rotating the bone grafting handle 5 anticlockwise until the bone grafting tube 6 separates from the fusion device 20 and is taken out, as shown in fig. 15, holding the grip handle shell 9, rotating the outer tube head 18 anticlockwise until the outer tube head is separated from the clamping tube head 17 by screw threads, moving the proximal end to the end, and at the moment, smoothly withdrawing the fusion device matching device.

The present invention will be described in detail and specifically with reference to the following examples to facilitate better understanding of the present invention, but the following examples do not limit the scope of the present invention.

Example 1

The present embodiment provides a kit for a minimally invasive fusion cage, as shown in fig. 1-2, including:

In this embodiment, as shown in fig. 3 and 10, two arc-shaped portions extend from the proximal end of the slider 12, and the inner surfaces of the arc-shaped portions are engaged with the threads on the outer surface of the screw 13; a limiting block 14 is positioned in the two arc-shaped parts, the limiting block 14 is provided with a pore passage, and the bone grafting tube 6 passes through the pore passage; the limiting block 14 extends two protrusions along the radial direction to penetrate through the gap between the two arc-shaped parts and be inserted into a clamping groove arranged on the inner shell 10.

In this embodiment, as shown in fig. 10, a circle of protrusions are arranged on the outer surface of the bone grafting tube 6, and the distal end surfaces of the protrusions are attached to the proximal end surface of the limiting block 14; the outer diameter of the protrusion is larger than the inner diameter of the hole and smaller than the inner diameter of the screw 13.

In this embodiment, as shown in fig. 2, the clamping tube head 17 and the clamping tube 15 are integrally formed, the outer tube 16 and the appearance head 18 are integrally formed, and the clamping tube head 17 is sleeved on the outer surface of the clamping tube 15; the outer surface of the clamping pipe head 17 is sleeved with an outer pipe head 18, and the clamping pipe head 17 can axially move relative to the outer pipe head 18; the far end of the clamping tube 15 is circumferentially provided with a chute and a platform, the outer diameter of a near end opening of the fusion device 20 is larger than the inner diameter of a far end opening of the clamping tube 15, and the far end part of the clamping tube 15 is provided with a plurality of axial grooves, so that the far end of the clamping tube can be expanded in a small range, and the near end of the fusion device 20 is inserted into the far end of the clamping tube 15; as shown in fig. 7, outer tip 18 is moved distally, causing outer tube 16 to move distally until the threads on the inner surface of outer tip 18 mate with the threads on the outer surface of retaining tip 17, rotating outer tip 18 until the distal surface of outer tube 16 is flush with the distal surface of retaining tube 15.

In this embodiment, as shown in fig. 4-5, a hexagonal limiting block extends from the outer surface of the proximal end of the bone grafting tube 6, a limiting cavity matched with the hexagonal limiting block is arranged in the bone grafting stem 5, a rotating cavity extends from the proximal end of the limiting cavity, and the rotating cavity is communicated with the outside through an opening at the proximal end of the bone grafting stem 5.

In this embodiment, as shown in fig. 14, the bone grafting unit 1 further includes a bone grafting funnel 19 and a bone grafting rod 21, wherein the distal end of the bone grafting funnel 19 is screw-fitted to the proximal end of the bone grafting tube 6, and the bone grafting rod 21 pushes the filling material in the bone grafting funnel 19 into the bone grafting tube 6 to reach the interior of the fusion cage 20. The bone grafting stem 21, which is an elongated stem having a cross-sectional diameter less than or equal to the minimum inner diameter of the bone grafting funnel 19 or the inner diameter of the bone grafting tube 6, helps an operator push bone filler from the bone grafting funnel 19 into the bone grafting tube 6 to the inside of the fusion cage 20 during a bone grafting operation.

In this embodiment, as shown in fig. 10, the handle unit 3 further includes a stop 11, and the stop 11 is connected to the proximal end of the inner housing 10 by screw-fitting; the screw 13 passes through the stop block 11 and enters the inner shell 10, a circle of fixing part extends from the outer surface of the screw 13 close to the stop block 11, and the fixing part is clamped between the inner shell 10 and the stop block 11.

Example 2

A specific method of using the device of example 1, comprising the steps of:

s5: a taking-out device: the bone grafting handle 5 is rotated to be separated from the rotating handle 7, as shown in figure 12, the bone grafting handle 5 is pulled upwards, the proximal end of the bone grafting handle 5 and the proximal end of the bone grafting tube 6 are changed from rotatable fit to non-rotatable fit, the bone grafting handle 5 is rotated anticlockwise until the bone grafting unit 1 is separated from the fusion device 20 and taken out, as shown in figure 15, the handle shell 9 is held, the outer tube head 18 is rotated anticlockwise until the outer tube head is separated from the clamping tube head 17 through threads, the proximal end is moved to the end, and at the moment, the fusion device matching device can be smoothly withdrawn.

The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.

Claims

1. A kit for a minimally invasive fusion cage, comprising:

the bone grafting unit (1) comprises a bone grafting handle (5) and a bone grafting tube (6), wherein the bone grafting handle (5) is sleeved at the near end of the bone grafting tube (6), and the bone grafting handle (5) moves for a certain distance along the axial direction relative to the bone grafting tube (6) to switch non-rotatable matching and rotatable matching;

the rotary handle unit (2) comprises a rotary handle (7) and a rotary handle block (8) fixed in the rotary handle (7); the bone grafting handle (5) is connected with the near end of the rotary handle (7) in a buckling way;

a grip unit (3) comprising a grip housing (9), an inner housing (10) fixed within the grip housing (9), and a slider (12) located within the inner housing (10); the rotary handle block (8) is fixedly connected with a screw rod (13), and the distal end of the screw rod (13) is inserted into the proximal end of the inner shell (10) and is fixed in the inner shell (10) in a circumferential direction in a rotatable manner; the near end of the sliding block (12) is in threaded connection with the far end of the screw rod (13);

the clamping unit (4) comprises a clamping pipe (15), a clamping pipe head (17), an outer pipe (16) and an outer pipe head (18) fixedly connected with the near end of the outer pipe (16); the outer tube (16) is sleeved outside the clamping tube (15), the near end of the clamping tube (15) is fixedly connected with the far end of the sliding block (12), and the far end of the clamping tube (15) is fixedly connected with the near end of the fusion device (20) through the matching of the outer tube (16); the far end of the bone grafting tube (6) penetrates through the rotary handle (7), the screw rod (13), the clamping tube (15) and the far end of the fusion cage (20) to be in threaded connection.

2. The kit of the minimally invasive fusion cage according to claim 1, wherein the proximal end of the slider (12) extends out of two arc-shaped portions, and the inner surfaces of the arc-shaped portions are matched with the threads on the outer surface of the screw rod (13); a limiting block (14) is positioned in the two arc-shaped parts, the limiting block (14) is provided with a pore passage, and the bone grafting tube (6) penetrates through the pore passage; the limiting block (14) extends out two protruding parts along the radial direction to penetrate through a gap between the two arc-shaped parts to be inserted into a clamping groove formed in the inner shell (10).

3. The matching device of the minimally invasive fusion cage according to claim 1, wherein the outer surface of the bone grafting tube (6) is provided with a circle of bulges, and the distal end surfaces of the bulges are jointed with the proximal end surface of the limiting block (14); the outer diameter of the protrusion is larger than the inner diameter of the pore passage.

4. The matching device of the minimally invasive fusion cage according to claim 1, wherein the clamping tube head (17) is sleeved on the outer surface of the clamping tube (15), the outer tube head (18) is sleeved on the outer surface of the clamping tube head (17), and the clamping tube head (17) can move axially relative to the outer tube head (18); the outer surface of the clamping pipe head (17) is provided with threads matched with the threads on the inner surface of the outer pipe head (18).

5. The matching device of the minimally invasive fusion cage according to claim 4, wherein the far end of the clamping tube (15) is circumferentially provided with a chute and a platform, and the far end of the clamping tube (15) is also provided with a plurality of axial grooves; after the proximal end of the fusion cage (20) is inserted into the distal end of the clamping tube (15), the outer tube (16) is moved until the distal end of the outer tube (16) is flush with the distal end of the clamping tube (15), so that the connection between the proximal end of the fusion cage (20) and the clamping tube (15) is stabilized.

6. The matching device of the minimally invasive fusion cage according to claim 1, wherein a hexagonal limiting block extends from the outer surface of the proximal end of the bone grafting tube (6), a limiting cavity matched with the hexagonal limiting block is arranged in the bone grafting handle (5), a rotating cavity extends from the proximal end of the limiting cavity, and the rotating cavity is communicated with the outside through an opening at the proximal end of the bone grafting handle (5); when the hexagonal limiting block is located the limiting cavity, the bone grafting handle (5) and the bone grafting pipe (6) are in non-rotatable fit, and when the hexagonal limiting block is located the rotating cavity, the bone grafting handle (5) and the bone grafting pipe (6) are in rotatable fit.

7. The kit of the minimally invasive fusion cage according to claim 1, wherein the bone grafting unit (1) further comprises a bone grafting funnel (19) and a bone grafting rod (21), wherein the distal end of the bone grafting funnel (19) is in threaded fit with the proximal end of the bone grafting tube (6), and the bone grafting rod (21) pushes the filling material in the bone grafting funnel (19) into the bone grafting tube (6) to the interior of the fusion cage (20).

8. The kit of minimally invasive fusion instruments according to claim 1, wherein the handle unit (3) further comprises a stop (11), the stop (11) is connected with the proximal end of the inner housing (10) through screw fitting; the screw rod (13) penetrates through the stop block (11) to enter the inner shell (10), a circle of fixing part extends out of the outer surface of the screw rod (13) close to the stop block (11), and the fixing part is clamped between the inner shell (10) and the stop block (11).

9. The kit of minimally invasive fusion instruments according to claim 1, wherein the outer tube (16) has an outer tube diameter of less than 7 mm.

10. The kit of minimally invasive fusion cage according to claim 7, wherein the cross-sectional diameter of the bone grafting stem (21) is less than or equal to the smallest inner diameter of the bone grafting funnel (19) or the inner diameter of the bone grafting tube (6).