CN114376772A - Interbody fusion cage and method of use - Google Patents

Abstract

The present invention provides an intervertebral fusion cage and a method of using the same, comprising: a accommodating part, the accommodating part can be stretched, the accommodating part is provided with an opening, and the outer surface of the accommodating part is covered with a drug adsorption layer , the material of the drug adsorption layer is medical gel; the drug adsorbed by the drug adsorption layer is a substance that can adsorb and promote bone growth. The intervertebral fusion device of the invention has the advantages of minimally invasive implantation, good osseointegration ability, more complete fusion, good immediate postoperative stability, less trauma, less bleeding, and quick postoperative recovery.

Description

Interbody cage and method of use

technical field

The present invention relates to the technical field of implanted instruments, in particular to an intervertebral cage and a method of using the same.

Background technique

In the common interbody fusion surgery, the interbody cage is the most commonly used device in the current interbody fusion surgery. According to the different surgical approaches, bullet-shaped cages are commonly used for the posterior approach; renal-type cages are commonly used for the lateral-posterior approach; and wedge-shaped cages are used for the anterior approach and the lateral-anterior approach. The current cage material is polyetheretherketone, which has poor osseointegration ability. After implantation, polyetheretherketone itself will not have bone ingrowth, so the later fusion mainly relies on bone grafting. In addition, minimally invasive surgery has the advantages of small incision, small soft tissue damage, less bleeding, and quick postoperative recovery, which has become a popular development direction of current spine surgery. How to relate to an intervertebral cage with good osseointegration ability and minimally invasive implantation is a problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

In view of the above-mentioned shortcomings of the prior art, the technical problem solved by the present invention is to provide an intervertebral cage.

In order to achieve the above object and other related objects, the present invention provides an intervertebral cage, comprising: a accommodating part, the accommodating part can be stretched, the accommodating part is provided with an opening, and the outer side of the accommodating part is covered with Covered with a drug adsorption layer.

Preferably, the material of the drug adsorption layer is medical gel.

Further, the drug adsorbed by the drug adsorption layer is a drug capable of adsorbing and promoting bone growth.

The present invention also relates to an intervertebral cage, comprising: an accommodating part, the accommodating part can be stretched, an opening is provided on the accommodating part, the outer surface of the accommodating part is covered with a drug adsorption layer, and the The material of the drug adsorption layer is medical gel; the drug adsorbed by the drug adsorption layer is a drug capable of adsorbing and promoting bone growth.

Preferably, the drug adsorbed by the drug adsorption layer is bone morphogenetic protein or stem cells.

Preferably, the accommodating portion is a pouch.

Preferably, the intervertebral cage further includes a connecting rod, one end of the connecting rod is connected to the opening, and a middle through hole is provided along the axial direction of the connecting rod, and the middle through hole is connected to the opening. The opening is connected.

Preferably, the intervertebral cage further includes a spreader bracket, which can be inserted into the accommodating portion; the spreader bracket includes: a bracket main body and a support rod;

The bracket body is a long strip structure, and the outer peripheral side surface of the bracket body includes a first slotted surface, a first support surface, a second slotted surface and a second support surface connected in sequence; the first slotted surface opposite to the second slotted surface; the first support surface and the second support surface are arranged opposite;

The front end of the bracket body in the longitudinal direction is provided with a mounting portion, and the rear end of the bracket body in the longitudinal direction is provided with a driving portion;

The bracket body is provided with a through hole, two ends of the through hole respectively penetrate to the front end of the mounting part and the rear end of the driving part, and the axial direction of the through hole is the same as the length direction of the bracket body. In the same direction;

The support rod passes through the installation part, the bracket main body and the driving part in sequence, the support rod and the through hole are in clearance fit, and the support rod is fixedly connected with the installation part; the support rod The rod has a hollow channel, and the hollow channel penetrates to the rear end of the support rod;

The middle part of the first grooved surface in the width direction has a middle long groove, the middle long groove penetrates to the second grooved surface, and the length direction of the middle long groove is the same as that of the first grooved surface. The length direction of a slotted surface is in the same direction;

Along the width direction of the first slotted surface, a first auxiliary slot group and a second auxiliary slot group are respectively provided on both sides of the middle elongated slot; the first auxiliary slot group and the first auxiliary slot group are respectively provided. The structures of the two auxiliary groove groups are the same. The first auxiliary groove group includes a front-end auxiliary groove and a rear-end auxiliary groove arranged in sequence along the length direction of the first slotted surface. There is a space between the end auxiliary grooves, and the midpoint of the connection line between the rear end of the front end auxiliary groove and the front end of the rear end auxiliary groove connects the connection line of the midpoint of the length of the middle elongated groove and the end point. The width directions of the main body of the bracket are in the same direction;

The first support surface is connected with the first support plate through a first connection block; the second support surface is connected with the second support plate through a second connection block;

The outer side wall of the support rod is provided with a side wall through hole, the side wall through hole communicates with the hollow channel, and the side wall through hole is in the main part formed by the communication between the through hole and the middle elongated slot. in the chamber, and comparing the front end and the rear end of the bracket body, the side wall through hole is closer to the front end of the bracket body;

The front end of the support rod is pressed to push the driving part to move toward the direction close to the installation part, and the bracket body extends into a hexagonal structure.

Preferably, the intervertebral cage further includes a spreading member, the spreading member is an elastic plate member, and the elastic plate member is curled and turned to form a plurality of ring-layer structures that are sequentially surrounded from the inside to the outside. The central axis of the layer structure is collinear.

The present invention also relates to a method for using an intervertebral cage. The drug adsorption layer of the intervertebral cage described in the claims is soaked in bone morphogenetic protein or stem cells, so that the drug adsorption layer adsorbs the bone morphogenetic protein. or stem cells.

As mentioned above, the intervertebral cage of the present invention and its using method have the following beneficial effects:

In the intervertebral cage of the present invention, the accommodating part enters the human body when it is not stretched, and when the accommodating part reaches between the vertebral bodies, the accommodating part is stretched again; then the intervertebral cage can be operated through a small channel in a minimally invasive manner During implantation; the outer surface of the accommodating part is covered with a drug adsorption layer, and the drug adsorption layer is immersed in the substance that promotes bone growth before operation, and the drug adsorption layer can absorb the substance that promotes bone growth; After the intervertebral space is opened, the drug adsorption layer can be attached between the vertebral bodies, and the bone growth-promoting substance on the drug adsorption layer can improve the binding ability of the bone; the present invention is a coated intervertebral fusion device, and the The intervertebral cage has the advantages of minimally invasive implantation, good osseointegration, more complete fusion, good immediate stability after surgery, less trauma, less bleeding, and faster postoperative recovery.

Description of drawings

Fig. 1 is a schematic diagram showing the structure of the intervertebral cage inserted between the vertebral bodies of Example 1.

FIG. 2 is a schematic diagram of the three-dimensional structure of the interbody cage of Example 1. FIG.

FIG. 3 is a schematic diagram showing the internal structure of the interbody cage of Example 1. FIG.

FIG. 4 is a schematic diagram showing the structure of the accommodating part of the intervertebral cage of Example 2 when a distraction bracket is inserted.

FIG. 5 is a schematic side view of the three-dimensional structure of the distraction bracket of the intervertebral cage of Example 2 in an initial state.

FIG. 6 is a schematic diagram showing the front side three-dimensional structure of the distraction bracket of the intervertebral cage of Example 2 in an initial state.

FIG. 7 is a schematic diagram showing the rear side three-dimensional structure of the distraction bracket of the intervertebral cage of Example 2 in an initial state.

FIG. 8 is a schematic side view of the structure of the distraction bracket of the intervertebral cage of Example 2 in an initial state.

FIG. 9 is a schematic diagram showing the cross-sectional structure of A-A of FIG. 8 .

FIG. 10 is a schematic side view of the structure of the stent body of the distracting stent of the intervertebral cage of Example 2 in an initial state.

FIG. 11 is a schematic diagram of the cross-sectional structure taken along the line B-B of FIG. 10 .

FIG. 12 is a schematic three-dimensional structural diagram of the support rod of the distraction bracket of the intervertebral cage of Example 2. FIG.

FIG. 13 is a schematic three-dimensional side structure view of the distraction bracket of the intervertebral cage of Example 2 in a deployed state.

FIG. 14 is a schematic three-dimensional structural diagram of the distraction component of the intervertebral cage of Example 3 in a tightened state.

FIG. 15 is a schematic three-dimensional structural diagram of the distraction component of the interbody cage of Example 3 in a stretched state.

Explanation of reference numerals

10 Housing

11 opening

20 Drug adsorption layer

30 connecting rod

31 Middle through hole

100 Bracket body

101 First grooved surface

102 First support surface

103 Second grooved surface

104 Second support surface

110 Installation part

111 Front indentation structure

120 Drive

121 card slot

130 Through hole

140 Middle slot

150 First Auxiliary Slot Group

151 Front Auxiliary Slot

152 Rear auxiliary slot

153 Front recessed structure of front groove

154 Front groove rear recessed structure

155 Front recessed structure of rear groove

156 Rear recessed structure of the rear groove

160 Second auxiliary slot group

171 First connection block

172 Second connection block

181 First support plate

182 Second support plate

183 First Bevel

184 Second slope

200 support rod

210 Hollow channel

220 Sidewall Through Holes

230 inner connector

240 Outer connector

300 spread parts

310 Circle Structure

Detailed ways

The embodiments of the present invention are described below by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

Please see attached image. It should be noted that the structures, proportions, sizes, etc. shown in the drawings in this specification are only used to cooperate with the contents disclosed in the specification, so as to be understood and read by those who are familiar with the technology, and are not used to limit the implementation of the present invention. Restricted conditions, it does not have technical substantive significance, any structural modification, proportional relationship change or size adjustment, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the present invention. The disclosed technical content must be within the scope of coverage. At the same time, the terms such as "up", "down", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and clarity, and are not used to limit this specification. The implementable scope of the invention, and the change or adjustment of the relative relationship thereof, shall also be regarded as the implementable scope of the present invention without substantially changing the technical content.

Example 1

As shown in FIG. 1 to FIG. 3 , the intervertebral cage of this embodiment includes: an accommodating part 10 , the accommodating part 10 can be stretched, an opening 11 is provided on the accommodating part 10 , and the outer surface of the accommodating part 10 is covered with The drug adsorption layer 20 is made of medical gel.

In the intervertebral cage of the present invention, the accommodating portion 10 enters the human body when it is not stretched, and when the accommodating portion 10 reaches between the vertebral bodies, the accommodating portion 10 is stretched again; the intervertebral cage can be operated in a minimally invasive manner It is implanted through a small channel; the outer surface of the accommodating part 10 is covered with a drug adsorption layer 20, and the material of the drug adsorption layer 20 is medical gel. The adsorption layer 20 can adsorb substances that promote bone growth; after the accommodating portion 10 is stretched between the vertebral bodies, the drug adsorption layer 20 can be attached between the vertebral bodies, and the substance that promotes bone growth on the drug adsorption layer 20 can improve bone growth. The present invention is a coated intervertebral fusion device, the intervertebral fusion device of the present invention has the advantages of minimally invasive implantation, good osseointegration ability, more thorough fusion, good immediate stability after operation, and less trauma. , less bleeding, faster postoperative recovery and so on. The intervertebral cage of the present invention can be applied to the endoscopic surgery of the intervertebral disc. The material of the medical gel in this embodiment is sodium hyaluronate. The drug adsorbed by the drug adsorption layer 20 is a substance capable of adsorbing and promoting bone growth. In this embodiment, the substance capable of adsorbing and promoting bone growth on the drug adsorption layer 20 is bone morphogenetic protein or stem cells.

The accommodating portion 10 is a pouch. Through the opening 11 of the capsular bag, the capsular bag can be opened by passing physiological saline or inflating gas into the capsular bag.

The method of using the intervertebral cage of the present embodiment includes the following steps:

1) soaking the drug adsorption layer 20 of the interbody cage in bone morphogenetic protein or stem cells, so that the drug adsorption layer 20 adsorbs bone morphogenetic protein or stem cells;

2) After the accommodating portion 10 reaches between the vertebral bodies, the pouch is filled with physiological saline or gas to be opened.

Example 2

As shown in FIGS. 4 to 13 , in this embodiment, the intervertebral cage further includes a connecting rod 30 , one end of the connecting rod 30 is connected to the opening 11 , and an intermediate through hole 31 is provided along the axial direction of the connecting rod 30 , The middle through hole 31 communicates with the opening 11 . The arrangement of the connecting rod 30 makes the structure of the intervertebral cage more stable and easier to operate.

The intervertebral cage also includes a spreader bracket, which can be inserted into the accommodating part 10; the spreader bracket can be inserted into the accommodating part 10; the spreader bracket includes: a bracket main body 100 and a support rod 200, the bracket main body 100 and The support rods 200 are all made of titanium; the bracket body 100 is a long strip structure, and the outer peripheral side of the bracket body 100 includes a first slotted surface 101 , a first support surface 102 , a second slotted surface 103 and a second slotted surface 101 connected in sequence. The supporting surface 104; the first slotted surface 101 is arranged opposite to the second slotted surface 103; the first supporting surface 102 is arranged opposite to the second supporting surface 104;

A mounting portion 110 is provided on the front end of the bracket body 100 in the longitudinal direction, and a driving portion 120 is provided on the rear end of the bracket body 100 in the longitudinal direction;

The bracket main body 100 is provided with a through hole 130, two ends of the through hole 130 respectively penetrate to the front end of the mounting part 110 and the rear end of the driving part 120, and the axial direction of the through hole 130 is the same as the longitudinal direction of the bracket main body 100;

The support rod 200 passes through the mounting part 110 , the bracket main body 100 and the driving part 120 in sequence, the support rod 200 and the through hole 130 are clearance fit, and the support rod 200 is fixedly connected with the mounting part 110 ; the support rod 200 has a hollow channel 210 , and the hollow channel 210 penetrates to the rear end of the support rod 200; the axial direction of the hollow channel 210 is the same as the axial direction of the support rod 200;

There is a middle elongated groove 140 in the middle in the width direction on the first slotted surface 101 , the middle elongated slot 140 penetrates to the second slotted surface 103 , and the length direction of the middle elongated slot 140 is the same as that of the first slotted surface 101 . The length direction is the same;

Along the width direction of the first slotted surface 101, a first auxiliary slot group 150 and a second auxiliary slot group 160 are respectively provided on both sides of the middle elongated slot 140; the first auxiliary slot group 150 and the second auxiliary slot group The structure of the group 160 is the same. The first auxiliary groove group 150 includes a front auxiliary groove 151 and a rear auxiliary groove 152 arranged in sequence along the length direction of the first slotted surface 101. There is a space between them, and the line connecting the midpoint of the connection line between the rear end of the front end auxiliary groove 151 and the front end of the rear end auxiliary groove 152 and the middle point of the length of the middle elongated groove 140 is the middle connection line, and the middle connection line In the same direction as the width W2 of the bracket body 100;

The first support surface 102 is connected with the first support plate 181 through the first connection block 171; the second support surface 104 is connected with the second support plate 182 through the second connection block 172;

The outer side wall of the support rod 200 has a side wall through hole 220, the side wall through hole 220 communicates with the hollow channel 210, the side wall through hole 220 is in the main chamber formed by the communication between the through hole 130 and the middle elongated groove 140, and Comparing the front end and rear end of the bracket body 100, the side wall through hole 220 is closer to the front end of the bracket body 100;

The front end of the support rod 200 is pushed against the front end of the support rod 200 to push the driving part 120 to move toward the direction close to the installation part 110 , and the bracket main body 100 extends into a hexagonal structure.

When the spreader bracket of this embodiment is used, the unstretched spreader bracket is arranged in the unstretched accommodating part 10 , when the accommodating part 10 needs to be opened, the front end of the support rod 200 is pressed against the front end of the support rod 200 to push the driving part 120 toward Moving in a direction close to the mounting portion 110 , the bracket body 100 extends into a hexagonal structure. The expansion bracket of this embodiment is made of titanium material, and the use of titanium material can ensure sufficient strength to maintain the normal shape of the vertebral body. The spreading bracket is used for spreading the receiving portion.

The first slotted surface 101, the first support surface 102, the second slotted surface 103 and the second support surface 104 are all planes; the first slotted surface 101 and the second slotted surface 103 are opposite and parallel to each other; the first support The surface 102 is opposite and parallel to the second supporting surface 104 ; the first supporting surface 102 is parallel to the outer surface of the first supporting plate 181 , and the second supporting surface 104 is parallel to the outer surface of the second supporting plate 182 .

Because the first auxiliary groove group 150 and the second auxiliary groove group 160 are respectively provided on both sides of the middle elongated groove 140; the first auxiliary groove group 150 and the second auxiliary groove group 160 have the same structure, and the first auxiliary groove group 150 The front end auxiliary groove 151 and the rear end auxiliary groove 152 are provided in sequence along the length direction of the first slotted surface 101 , and the structure is convenient for the stent main body 100 to be extended.

The first support surface 102 is connected to the first support plate 181 through the first connection block 171 ; the second support surface 104 is connected to the second support plate 182 through the second connection block 172 , and the structure makes the first support surface 102 and the first support plate 182 connected. There is no contact between the plates 181 and no contact between the second support surface 104 and the second support plate 182, so when the bracket body 100 is stretched out, the first support plate 181 and the second support plate 182 can achieve a stable support force.

Since there is a space between the front end auxiliary groove 151 and the rear end auxiliary groove 152 , the midpoint of the line connecting the rear end of the front end auxiliary groove 151 and the front end of the rear end auxiliary groove 152 is connected to the middle point of the length of the middle elongated groove 140 The connection line is in the same direction as the width W2 of the bracket body 100 . This structure facilitates the expansion of the stent body 100 to form a hexagonal structure.

The plane passing through the midpoint of the line between the rear end of the front end auxiliary groove 151 and the front end of the rear end auxiliary groove 152 and perpendicular to the length direction of the bracket main body 100 is the vertical middle plane of the bracket main body 100 . The first connecting block 171 Both ends of the second connecting block 172 in the length direction are at the same distance from the vertical middle plane, and both ends of the second connecting block 172 in the length direction are the same distance from the vertical middle plane. The position of the middle part in the longitudinal direction of the interval between the front end auxiliary groove 151 and the rear end auxiliary groove 152 corresponds to the position of the middle part in the length direction of the first connecting block 171 ; between the front end auxiliary groove 151 and the rear end auxiliary groove 152 The position of the middle part in the length direction of the interval corresponds to the position of the middle part in the length direction of the second connecting block 172; since the first connecting block 171 strengthens the front auxiliary groove 151 and the rear auxiliary groove of the first auxiliary groove group 150 The strength at the interval between 152 is beneficial for the interval between the front auxiliary groove 151 and the rear auxiliary groove 152 of the first auxiliary groove group 150 to be able to act as a One side of the hexagonal structure; since the second connecting block 172 enhances the strength of the interval between the front auxiliary groove 151 and the rear auxiliary groove 152 of the second auxiliary groove group 160, it is beneficial to the second auxiliary groove group The interval between the front end auxiliary groove 151 and the rear end auxiliary groove 152 of 160 can be used as one side of the hexagonal structure during the process of extending the bracket body 100 into the hexagonal structure.

Both ends of the first support plate 181 in the length direction are the same distance from the vertical middle plane, and both ends of the second support plate 182 in the length direction are the same distance from the vertical middle plane. This structure allows the first support plate 181 and the second support plate 182 to receive a stable support force.

The widths of the first support plate 181 and the second support plate 182 are equal, and the width W2 of the bracket body 100 is less than or equal to the width of the first support plate 181 . In this embodiment, the width W2 of the bracket body 100 is equal to the width of the first support plate 181 . This structure enables the first support plate 181 and the second support plate 182 to have better supporting force.

The outer surface of the first support plate 181 is parallel to the outer surface of the second support plate 182 ; the distance between the outer surface of the first support plate 181 and the outer surface of the second support plate 182 is shown in H in FIG. 8 .

The front part of the installation part 110 is a forward retraction structure 111 that is retracted forward, and the front end of the front retraction structure 111 is an arc-shaped end surface. This structure makes the front part of the installation part 110 form the shape of a bullet, which is convenient for insertion and installation.

The outer side of the forward retraction structure 111 has two oppositely arranged front retraction inclined surfaces 1111; The front part of the outer side surface is a second inclined surface 184 inclined towards the bracket body 100; the first inclined surface 183 is coplanar with one of the inclined surfaces of the fore-reduction part 1111, and the second inclined surface 184 is coplanar with the other inclined surface of the fore-reduction part 1111, so as to facilitate the Insert into the pouch.

The front end of the hollow channel 210 of the support rod 200 is provided with an inner connecting part 230 for connecting the front positioning tool. The front positioning tool is connected with the inner connecting portion 230 to fix the position of the front end of the support rod 200 , that is, the front positioning tool presses against the front end of the support rod 200 .

In this embodiment, the inner connecting portion 230 is an inner thread. The front positioning tool is a medical positioning tool having an external thread corresponding to the internal thread of the inner connecting portion 230 .

The driving part 120 is provided with a card slot 121 . The clamping slot 121 can be inserted into the medical tool that pushes the driving part 120 , so as to facilitate the pushing of the driving part 120 .

In this embodiment, the driving portion 120 is cylindrical. This structure enables the driving part 120 to be pushed stably.

The first support plate 181 and the second support plate 182 have the same structure, and the width W1 of the first support plate 181 can provide a larger support surface and stably support the vertebral body.

The front part of the groove wall of each front end auxiliary groove 151 is provided with a front groove part front concave structure 153, and the rear part of the groove wall of each front end auxiliary groove 151 is provided with a front groove part rear concave structure 154; each rear auxiliary groove The front part of the groove wall of 152 is provided with a rear groove part front concave structure 155 , and the rear part of the groove wall of each rear end auxiliary groove 152 is provided with a rear groove part rear concave structure 156 .

The front recessed structure 153 of the front groove portion includes two first front recessed portions disposed opposite to the front of the groove wall of the front end auxiliary groove 151 , and the rear recessed structure 154 of the front groove portion includes two groove walls disposed opposite to the front end auxiliary groove 151 . The first rear recessed part of the rear part; the front recessed structure 155 of the rear groove part includes two second front recessed parts opposite to the front part of the groove wall of the rear end auxiliary groove 152; the rear recessed structure 156 of the rear groove part includes two a second rear concave part opposite to the rear part of the groove wall of the rear end auxiliary groove 152 .

The method of using the intervertebral cage of the present embodiment includes the following steps:

1) soaking the drug adsorption layer 20 of the interbody cage in bone morphogenetic protein or stem cells, so that the drug adsorption layer 20 adsorbs bone morphogenetic protein or stem cells;

2) When the accommodating part 10 reaches between the vertebral bodies, it pushes the front end of the support rod 200 and pushes the driving part 120 to move towards the direction close to the mounting part 110. The bracket body 100 is stretched into a hexagonal structure, so that the accommodating part 10 is supported. open.

Example 3

As shown in FIGS. 3 , 14 to 15 , in this embodiment, the intervertebral cage further includes a spreading member 300 . The spreading member 300 is an elastic plate member, and the elastic plate member is curled and rotated to form an inner The central axes of all the ring structures 310 are collinear with respect to the plurality of ring structures 310 that are successively surrounded to the outside. When the opening part 300 is initially in a tightened state; when the opening part 300 needs to be opened to open the accommodating part 10, the opening part 300 is driven so that the opening part 300 is in a stretched state, then the opening part 300 is opened. Stretch into a single wraparound layer.

The method of using the intervertebral cage of the present embodiment includes the following steps:

1) soaking the drug adsorption layer 20 of the interbody cage in bone morphogenetic protein or stem cells, so that the drug adsorption layer 20 adsorbs bone morphogenetic protein or stem cells;

2) After the accommodating part 10 reaches between the vertebral bodies, the spreading member 300 is driven, so that the spreading member 300 is stretched.

To sum up, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

The above-mentioned embodiments merely illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can make modifications or changes to the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed in the present invention should still be covered by the claims of the present invention.

Claims (10)

1. An intervertebral cage, characterized in that it comprises: an accommodating part (10), the accommodating part (10) can be stretched, an opening (11) is provided on the accommodating part (10), the accommodating part (10) is The outer surface of the part (10) is covered with a drug adsorption layer (20). 2 . The interbody cage according to claim 1 , wherein the material of the drug adsorption layer ( 20 ) is medical gel. 3 . 3 . The cage according to claim 3 , wherein the drug adsorbed by the drug adsorption layer ( 20 ) is a substance capable of adsorbing and promoting bone growth. 4 . 4. An intervertebral cage, characterized in that it comprises: an accommodating part (10), the accommodating part (10) can be stretched, an opening (11) is provided on the accommodating part (10), the accommodating part (10) is The outer surface of the part (10) is covered with a drug adsorption layer (20), and the material of the drug adsorption layer (20) is medical gel; the drug adsorbed by the drug adsorption layer (20) is capable of adsorbing and promoting bone growing substance. 5. The interbody cage according to any one of claims 1-4, wherein the drug adsorbed by the drug adsorption layer (20) is bone morphogenetic protein or stem cells. 6. The intervertebral cage according to claim 1 or 4, characterized in that: the accommodating part (10) is a pouch. 7. The intervertebral cage according to claim 1 or 4, characterized in that it further comprises a connecting rod (30), one end of the connecting rod (30) is connected with the opening (11), along the An intermediate through hole (31) is provided in the axial direction of the connecting rod (30), and the intermediate through hole (31) communicates with the opening (11). 8. The intervertebral cage according to claim 1 or 4, characterized in that it further comprises a spreader bracket, which can be inserted into the accommodating part (10); the spreader bracket comprises: A bracket main body (100) and a support rod (200); the bracket main body (100) is a long strip structure, and the outer peripheral side surface of the bracket main body (100) comprises a first slotted surface (101), a first slotted surface (101), a first a support surface (102), a second slotted surface (103) and a second support surface (104); the first slotted surface (101) is arranged opposite to the second slotted surface (103); the first slotted surface (101) is arranged opposite to the second slotted surface (103); A support surface (102) is arranged opposite to the second support surface (104); The front end of the bracket body (100) in the longitudinal direction is provided with a mounting part (110), and the rear end of the bracket body (100) in the longitudinal direction is provided with a driving part (120); The bracket body (100) is provided with a through hole (130), and both ends of the through hole (130) respectively penetrate to the front end of the mounting portion (110) and the rear end of the driving portion (120), The axial direction of the through hole (130) is the same as the longitudinal direction of the bracket body (100); The support rod (200) passes through the mounting part (110), the bracket main body (100) and the driving part (120) in sequence, and the support rod (200) and the through hole (130) are In clearance fit, the support rod (200) is fixedly connected with the mounting portion (110); the support rod (200) has a hollow channel (210), and the hollow channel (210) penetrates to the support rod (200). ) backend; There is a middle elongated groove (140) in the middle part in the width direction on the first slotted surface (101), and the middle elongated slot (140) penetrates to the second slotted surface (103), so The length direction of the middle elongated groove (140) is the same as the length direction of the first slotted surface (101); A first auxiliary groove group (150) and a second auxiliary groove group (160) are respectively provided on both sides of the middle elongated groove (140) along the width direction of the first grooved surface (101) ; The structure of the first auxiliary groove group (150) and the second auxiliary groove group (160) are the same, and the first auxiliary groove group (150) includes a groove along the first grooved surface (101) A front-end auxiliary groove (151) and a rear-end auxiliary groove (152) are arranged in sequence in the length direction of the front-end auxiliary groove (151) and there is a space between the front-end auxiliary groove (151) and the rear-end auxiliary groove (152), and the front-end auxiliary groove ( 151) and the front end of the rear auxiliary groove (152), the midpoint of the line connecting the midpoint of the length of the middle elongated groove (140) and the bracket main body (100) ) in the same width direction; The first support surface (102) is connected to the first support plate (181) through the first connection block (171); the second support surface (104) is connected to the second support plate (181) through the second connection block (172). 182) connect; The outer side wall of the support rod (200) is provided with a side wall through hole (220), the side wall through hole (220) communicates with the hollow channel (210), and the side wall through hole (220) is located at the In the main chamber formed by the communication between the through hole (130) and the middle elongated groove (140), and comparing the front end and the rear end of the bracket body (100), the side wall through hole (220) ) is closer to the front end of the bracket body (100); The front end of the support rod (200) is pushed against the driving part (120) to move toward the direction close to the installation part (110), and the bracket body (100) extends into a hexagonal structure. 9. The intervertebral cage according to claim 1 or 4, characterized in that: further comprising a spreading member (300), the spreading member (300) is an elastic plate member, and the elastic plate member is formed by curling and turning For a plurality of ring-layer structures (310) that are sequentially surrounded from inside to outside, the central axes of all the ring-layer structures (310) are collinear. 10. A method of using an intervertebral cage, characterized in that: the drug-adsorbing layer (20) of the intervertebral cage according to claim 1 or 4 is soaked in bone morphogenetic protein or stem cells, so that the The drug adsorption layer (20) adsorbs bone morphogenetic proteins or stem cells.

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