CN219250561U - Zero-notch anterior cervical fusion device - Google Patents

Abstract

The utility model discloses a zero-notch anterior cervical fusion device, which comprises: a cage body and a plurality of screws; a cage body comprising: the first closed frame, the second closed frame, the first connecting rod and the second connecting rod; a plurality of mounting parts are connected between the first closed frame and the second closed frame; the screw is detachably connected with the mounting part; a porous net structure is filled in a space enclosed between the first closed frame and the second closed frame; the fusion device body and the screw are respectively of an integrated structure manufactured by 3D printing. The utility model has better bone conductivity and osseointegration effect, adopts the structure of the oblique-crossing beam, reduces the integral rigidity of the fusion device under the condition of meeting the integral strength, is beneficial to bone ingrowth and fusion, and reduces the risk of loosening the fusion device in vivo. Meanwhile, the device can be fixed between two vertebral bodies only through the fusion device, and the fixation by using a fixed steel plate is not needed, so that the operation time is shortened, and complications such as postoperative esophageal foreign body sensation, dysphagia and the like are reduced.

Description

Zero-notch anterior cervical fusion device

Technical Field

The utility model belongs to the technical field of medical appliances, and particularly relates to a zero-notch anterior cervical fusion cage.

Background

The anterior cervical decompression fusion is to restore the height between vertebrae and the physiological radian of cervical vertebrae, to make the cervical vertebrae reach instant stabilization, and the bone grafting fusion is needed in the decompression area, which is a common operation method for treating cervical spondylosis clinically. During the procedure, the fusion cage can be held by a tool and delivered into the cervical spine. The body structure of the prior anterior cervical fusion cage is mostly a solid structure, has larger rigidity, is not beneficial to bone ingrowth and fusion, and is easy to cause the conditions of bone disunion and bone disconnection.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model provides a zero-notch anterior cervical fusion cage. The technical problems to be solved by the utility model are realized by the following technical scheme:

a zero-notch anterior cervical cage, comprising: a cage body and a plurality of screws;

the cage body includes: the first closed frame, the second closed frame, the first connecting rod and the second connecting rod;

a plurality of mounting parts are connected between the first closed frame and the second closed frame;

the mounting part is provided with a mounting through hole; the screw is detachably connected with the mounting through hole;

the first connecting rod and the second connecting rod are in cross connection, and two ends of the first connecting rod and the second connecting rod are respectively and fixedly connected with the first closed frame and the second closed frame;

the first connecting rod and the second connecting rod are arranged opposite to the mounting part;

a porous net structure is filled in a space enclosed between the first closed frame and the second closed frame;

wherein, the fusion device body and the screw adopt 3D to print the integrated into one piece structure of preparation respectively.

In one embodiment of the utility model, the number of screws is the same as the number of mounting portions.

In one embodiment of the utility model, the mounting through hole is in threaded connection with the screw;

wherein the two screws extend towards the outer side of the first closed frame and the outer side of the second closed frame respectively.

In one embodiment of the utility model, the device further comprises a clamp spring;

a notch is formed at the orifice of the mounting through hole, and a clamping groove extending along the circumferential direction is formed in the inner wall of the mounting through hole;

the screw comprises a screw rod and a screw cap;

the screw cap is fixedly connected with one end of the screw rod, and the outer wall of the screw cap is provided with a mounting groove extending along the circumferential direction;

the clamping spring is provided with an opening, and two ends of the clamping spring are respectively provided with clamping parts which are opposite to the center of the clamping spring and extend along the radial direction;

the clamping springs are clamped on the mounting grooves, the outer edges of the clamping springs can be located in the clamping grooves, and the clamping portions can be located in the gaps.

In one embodiment of the present utility model, the clamping portion is provided with a clamping through hole.

In one embodiment of the utility model, the cage body and the screw are each one of titanium, titanium alloy, cobalt alloy, stainless steel, tantalum metal, and magnesium alloy.

In one embodiment of the utility model, part or all of the surface of the cage body is coated with a hydroxyapatite coating.

The utility model has the beneficial effects that:

according to the utility model, the truss structure of the frame is formed by the first closed frame, the second closed frame, the first connecting rod and the second connecting rod, and the truss structure is filled with the porous net structure, so that the porous net structure can be in contact with surrounding tissues of an implantation part through larger gaps of the truss, more surfaces and bone combining sites are provided, cells can migrate into the fusion device body, new blood vessels and new bone tissues are allowed to grow into the gaps, and in the structure, the first connecting rod and the second connecting rod form a connection supporting mode of oblique cross beams, so that the force conduction is optimized, the risk of crushing materials around the supporting beam is reduced, the stress concentration phenomenon around the supporting beam is reduced, and the irreversible deformation of the fusion device in a human body is avoided. Under the condition of meeting the integral strength, the integral rigidity of the fusion device is reduced, the bone conductivity and the bone integration effect are better, and bone ingrowth and fusion are facilitated, so that the fusion device body and vertebrae are more tightly connected, and the risk of loosening the fusion device in the body is reduced. Meanwhile, the device can be fixed between two vertebral bodies only through the fusion device, and the fixation by using a fixed steel plate is not needed, so that the operation time is shortened, and complications such as postoperative esophageal foreign body sensation, dysphagia and the like are reduced.

The present utility model will be described in further detail with reference to the accompanying drawings and examples.

Drawings

FIG. 1 is a schematic structural view of a zero-notch anterior cervical cage according to an embodiment of the present utility model;

FIG. 2 is a schematic view of the other side of the zero-notch anterior cervical cage according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a cage body according to an embodiment of the present utility model;

fig. 4 is a schematic structural view of a frame of a cage body according to an embodiment of the present utility model;

fig. 5 is a schematic structural view of a screw according to a second embodiment of the present utility model;

fig. 6 is a schematic structural diagram of a cage body according to a second embodiment of the present utility model;

fig. 7 is a schematic structural diagram of a fusion device according to a second embodiment of the present utility model;

fig. 8 is a schematic structural view of another cage body according to the second embodiment of the present utility model;

fig. 9 is a schematic structural view of another fusion device according to the second embodiment of the present utility model;

fig. 10 is a schematic structural view of a fusion device according to a third embodiment of the present utility model;

FIG. 11 is a schematic view of a screw according to a third embodiment of the present utility model;

fig. 12 is a schematic structural view of a snap spring according to a third embodiment of the present utility model;

fig. 13 is a schematic structural view of a cage body according to a third embodiment of the present utility model;

fig. 14 is a schematic structural view of one side of a first connecting rod and a second connecting rod of a cage body according to a third embodiment of the present utility model.

Reference numerals illustrate:

11-a first closed border; 12-a second closed bezel; 13-a first connecting rod; 14-a second connecting rod; 15-an installation part; 16-mounting through holes; 17-notch; 18-clamping grooves; 19-internal threads; 20-screws; 21-a nut; 22-external threads; 23-screw; 24-mounting grooves; 30-porous network structure; 40-snap springs; 41-clamping part; 42-clamping through holes.

Detailed Description

The present utility model will be described in further detail with reference to specific examples, but embodiments of the present utility model are not limited thereto.

Example 1

As shown in fig. 1, 2, 3 and 4, a zero-notch anterior cervical cage, comprising: a cage body and a plurality of screws 20. A cage body comprising: the first closed frame 11, the second closed frame 12, the first connecting rod 13 and the second connecting rod 14.

A plurality of mounting portions 15 are connected between the first and second closed frames 11 and 12. The mounting part 15 is provided with a mounting through hole 16; the screw 20 is detachably connected to the mounting through hole 16. When the fusion cage is implanted, the screw 20 penetrates into the mounting through hole 16 and the adjacent two vertebral bodies to fix the fusion cage body between the two vertebral bodies. The first connecting rod 13 and the second connecting rod 14 are connected in a cross manner, and two ends of the first connecting rod are respectively fixedly connected with the first closed frame 11 and the second closed frame 12. Specifically, two ends of the first connecting rod 13 are fixedly connected with the first closed frame 11 and the second closed frame 12, and two ends of the second connecting rod 14 are fixedly connected with the first closed frame 11 and the second closed frame 12. The first connecting rod 13 and the second connecting rod 14 are disposed opposite to the mounting portion 15. The space enclosed between the first closed frame 11 and the second closed frame 12 is filled with a porous net structure 30. The porous network 30 is a three-dimensional network. Wherein, the fusion device body and the screw 20 are respectively in an integrated structure manufactured by 3D printing.

In this embodiment, the first closed frame 11, the second closed frame 12, the first connecting rod 13 and the second connecting rod 14 form a truss structure of the frame, and the truss structure is filled with the porous reticular structure 30, the porous reticular structure 30 can be in contact with surrounding tissues of an implantation position through larger gaps of the truss, more surfaces and bone combining sites are provided, cells can migrate into the interior of the fusion device body, new blood vessels and new bone tissues are allowed to grow into the gaps, and in the structure, the first connecting rod 13 and the second connecting rod 14 form a connection supporting mode of oblique cross beams, so that the force conduction is optimized, the risk of crushing materials around the supporting beam is reduced, the stress concentration phenomenon around the supporting beam is reduced, the fusion device is prevented from being irreversibly deformed in a human body, the overall rigidity of the fusion device is reduced under the condition that the overall strength is met, the bone conduction and the bone integrating effect are better, the bone growth and fusion are facilitated, the fusion device body and the risk of loosening the fusion device in the body is reduced. Meanwhile, the device can be fixed between two vertebral bodies only through the fusion device, and the fixation by using a fixed steel plate is not needed, so that the operation time is shortened, and complications such as postoperative esophageal foreign body sensation, dysphagia and the like are reduced.

Preferably, a porous lattice structure is also understood to be a reticulated micro-porous structure with an average pore size in the range of 0.1-2 mm.

In addition, the first closed frame 11, the second closed frame 12 and the mounting portion 15 reduce the solid volume of the truss, and the first connecting rod 13 and the second connecting rod 14 reduce the integral rigidity of the fusion device, improve the fusion effect and promote the effect of bone healing and bone connection under the condition that the structural strength of the truss is ensured.

In the present embodiment, the number of the screws 20 is the same as the number of the mounting portions 15, and the number of the mounting portions 15 may be two, three, or four.

Wherein, the fusion device body and the screw 20 are made of one of titanium, titanium alloy, cobalt alloy, stainless steel, tantalum metal and magnesium alloy by integral molding. Compared with the high polymer material mainly comprising polyether ether ketone PEEK, the material of the fusion device has better bone-combining effect. Part or all of the surface of the fusion device body is coated with a hydroxyapatite coating. The hydroxyapatite coating has the function of inducing cell growth, thereby promoting soft tissue ingrowth into the porous network 30 of the cage. Meanwhile, in order to flexibly adapt to the required structural sizes of different patients, the fusion cage is manufactured in a 3D printing mode. And the specification and the shape of the bone contacting surface can be matched according to the requirements of patients.

In a feasible implementation mode, the fusion device can adopt the technologies of laser or high-energy electron beam rapid prototyping, high-temperature sintering, chemical corrosion and the like, and other processing methods also comprise mechanical cutting, electric discharge machining and the like; the hydroxyapatite coating is obtained by high-temperature spraying or electrochemical deposition.

Example two

As shown in fig. 5, 6, 7, 8 and 9, the present embodiment further defines a mounting through hole 16 in threaded connection with the screw 20 on the basis of the first embodiment. Wherein two screws 20 extend towards the outside of the first closing rim 11 and the outside of the second closing rim 12, respectively.

In this embodiment, the inner wall of the mounting through hole 16 has an internal thread 19, and the outer wall of the nut 21 of the screw 20 has an external thread 22, and the internal thread 19 and the external thread 22 are screwed together to fix the screw 20. The fixing mode of the embodiment has simple structure and simple operation in the implantation process.

The mounting through hole 16 is fixed to the nut 21 of the screw 20 by tapered screw connection. The thread of the nut 21 and the thread of the screw have different pitches. The two threads on the screw 20 are simultaneously stressed by opposite axial forces when the screw 20 is fixed, so that the screw 20 is fixed, the screw 20 is prevented from withdrawing, and loosening after the fusion device is implanted is avoided.

In this embodiment, as shown in fig. 6 and 7, when the cage has two screws 20, the two screws 20 extend in opposite directions. As shown in fig. 8 and 9, when the cage has three screws 20, two of the screws 20 extend in the same direction and the other in opposite directions, specifically, two screws 20 beside are in the same direction and the middle screw 20 is in opposite directions. As shown in fig. 1, when the cage has four screws 20, two screws 20 in the middle extend in the same direction toward one side, and two screws 20 on both sides extend in the same direction toward the other side.

Example III

As shown in fig. 10, 11, 12, 13 and 14, the present embodiment further defines a zero-notch anterior cervical cage on the basis of the first embodiment, and further includes a clip spring 40.

The hole opening of the mounting through hole 16 is provided with a notch 17, and the inner wall of the mounting through hole 16 is provided with a clamping groove 18 extending along the circumferential direction.

Screw 20, including shank 23 and nut 21. The screw cap 21 is fixedly connected with one end of the screw rod 23, and a mounting groove 24 extending along the circumferential direction is formed in the outer wall of the screw cap 21.

The clamp spring 40 has an opening, and both ends of the clamp spring 40 have clamping portions 41 respectively extending in the radial direction and facing away from the center of the clamp spring 40. The clamping spring 40 is clamped on the mounting groove 24, the outer side edge of the clamping spring 40 can be located in the clamping groove 18, and the clamping portion 41 can be located in the notch 17.

In this embodiment, after the snap spring 40 is installed on the installation groove 24, the clamping spring 40 is clamped by the clamping portion 41 and the screw 20 is screwed through the installation through hole 16, when the installation groove 24 is screwed into the position of the clamping groove 18, the snap spring 40 is loosened, the snap spring 40 is spread and clamped into the clamping groove 18, the clamping portion 41 is located on the notch 17, at this time, the snap spring 40 is clamped in the installation groove 24 and the clamping groove 18, so that the screw 20 cannot be screwed in or out continuously, the screw 20 is prevented from being out of the installation through hole 16, loosening of the fusion cage after implantation is avoided, and reliability and safety are improved. When not implanted, the screw 20 can also be fixed on the fusion device body, and when the screw 20 needs to be withdrawn, the screw 20 can be taken out by clamping the snap spring 40.

Wherein, the clamping part 41 is provided with a clamping through hole 42. The clamping spring 40 can be conveniently operated by using a tool through the clamping through hole 42, and the convenience of operation is improved.

Wherein, the installation through hole 16 is the bell mouth, and screw 20 promotes jump ring 40 precession when precession screw 20, because the bell mouth radius reduces gradually jump ring 40 can receive the axle wall pressure, and outer lane radius reduces gradually, until the pressure release to draw-in groove 18 department, jump ring 40 card is in draw-in groove 18 this moment. The conical hole is more beneficial to better enter the clamping groove 18 of the clamping spring 40 when the screw 20 is screwed on, and the operation is more convenient.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.

The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the utility model, and these should be considered to be within the scope of the utility model.

Claims (7)

1. A zero-notch anterior cervical cage, comprising: a cage body and a plurality of screws (20);

the cage body includes: the first closed frame (11), the second closed frame (12), the first connecting rod (13) and the second connecting rod (14);

a plurality of mounting parts (15) are connected between the first closed frame (11) and the second closed frame (12);

the mounting part (15) is provided with a mounting through hole (16); the screw (20) is detachably connected with the mounting through hole (16);

the first connecting rod (13) and the second connecting rod (14) are in cross connection, and two ends of the first connecting rod are respectively and fixedly connected with the first closed frame (11) and the second closed frame (12);

the first connecting rod (13) and the second connecting rod (14) are arranged opposite to the mounting part (15);

a porous net structure (30) is filled in a space enclosed between the first closed frame (11) and the second closed frame (12);

wherein, the fusion device body and the screw (20) adopt an integrated structure manufactured by 3D printing respectively.

2. The zero-notch anterior cervical cage according to claim 1, characterized in that the number of screws (20) is the same as the number of mounting portions (15).

3. The zero-notch anterior cervical cage according to claim 2, characterized in that the mounting through hole (16) is screwed with the screw (20);

wherein the two screws (20) extend towards the outer side of the first closed frame (11) and the outer side of the second closed frame (12) respectively.

4. The zero-notch anterior cervical cage of claim 2, further comprising a snap spring (40);

a notch (17) is formed in the orifice of the mounting through hole (16), and a clamping groove (18) extending along the circumferential direction is formed in the inner wall of the mounting through hole (16);

the screw (20) comprises a screw rod (23) and a nut (21);

the nut (21) is fixedly connected with one end of the screw rod (23), and a mounting groove (24) extending along the circumferential direction is formed in the outer wall of the nut (21);

the clamping spring (40) is provided with an opening, and two ends of the clamping spring are respectively provided with clamping parts (41) which are opposite to the center of the clamping spring (40) and extend along the radial direction;

the clamping spring (40) is clamped on the mounting groove (24), the outer side edge of the clamping spring can be located in the clamping groove (18), and the clamping part (41) can be located in the notch (17).

5. The zero-notch anterior cervical cage according to claim 4, wherein the clamping portion (41) is provided with a clamping through hole (42).

6. The zero-notch anterior cervical cage of claim 1, wherein the cage body and the screw (20) are each one of titanium, titanium alloy, cobalt alloy, stainless steel, tantalum metal, and magnesium alloy.

7. The zero-notch anterior cervical cage of claim 1, wherein a portion or all of the surface of the cage body is coated with a hydroxyapatite coating.

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