CN213552651U - Self-adaptive intervertebral fusion device - Google Patents

Abstract

The utility model provides a self-adaptive interbody fusion cage, which is characterized by comprising a main body part and an elastic part arranged on the main body part, wherein the main body part is a porous body structure taking a three-dimensional network structure as a framework and is provided with an upper surface and a lower surface which are opposite; the elastic portion includes a plurality of elastic pieces formed on at least one of the upper surface and the lower surface of the main body portion and arranged in a two-dimensional direction, the elastic pieces having an elastic body with a gap therebetween. Therefore, the elastic part is easily and adaptively stressed according to the contact surface of the vertebrae and the interbody cage, thereby improving the clinical restoration effect of the interbody cage. In addition, since the intervertebral cage can stimulate the fusion surface of the vertebrae more uniformly, it has good bone induction property and can promote the bone to recover and grow.

Description

Self-adaptive intervertebral fusion device

The application is filed as13/05/2019Application No. is201920690798.5Name of utility modelIntervertebral fusion device with elastic partDivisional application of the patent application.

Technical Field

The utility model relates to an intervertebral fusion cage with an elastic part.

Background

With the aggravation of aging of population and the change of life habits of people in modern cities, spine degenerative diseases represented by cervical spondylosis, cervical intervertebral disc protrusion, lumbar spinal stenosis and the like seriously affect the work and life of people. At present, conservative treatment methods such as drug therapy and physical therapy are mostly adopted when the above-mentioned disease conditions are in the early stage. However, as the patient's condition becomes more severe, more effective treatments, such as vertebroplasty, are contemplated to inhibit the patient's condition from becoming worse. For example, in case of lumbar intervertebral disc protrusion, when the intervertebral disc protrusion presses the vertebral canal beyond 1/3 or numbness, difficulty in movement, weakness of urination and defecation, etc. of the lower limbs occur, the treatment effect of the conservative treatment method is not obvious, and the patient needs to be considered to perform vertebral fusion.

In the vertebral fusion, the intervertebral disc protruded between vertebrae is removed, and then an intervertebral fusion device is implanted between the vertebrae to induce the vertebrae to be fused together, so as to achieve the purpose of eliminating the focus. In the clinical application of the vertebral fusion, because the intervertebral fusion cage is placed in a human body for a long time after the operation, the factors such as the structure, the manufacturing technology, the quality and the like of the intervertebral fusion cage play an important role in the postoperative effect of the vertebral fusion.

Patent document 1 discloses a shapeable individualized spine fusion cage, which comprises an upper top plate, a lower top plate, a shaping spring, an internal biological silica gel ring, an external biological silica gel ring, a buckle A and a buckle B of the fusion cage. Go up roof and roof down link together through reset spring, interior biological silica gel circle and outer biological silica gel circle distribute in reset spring's inboard and outside to connect on roof about through buckle A and buckle B, and outer biological silica gel circles and has a bone cement filling hole.

However, in the above-mentioned patent document 1, although the height, angle, inclination, etc. of the fusion cage can be adjusted, the shapes of the upper top plate and the lower top plate of the fusion cage are fixed, and there is an individual difference between each individual operation, and the surface contacting with the human bone cannot be completely fitted. Therefore, the fusion cage of patent document 1 does not contribute to the fusion effect between vertebrae.

Documents of the prior art

Patent document 1: chinese patent application publication No. CN 104083235A.

Disclosure of Invention

The present invention has been made in view of the above-mentioned prior art, and an object of the present invention is to provide an adaptive intervertebral fusion cage which can adapt to the shapes of different intervertebral bones, increase the bone inducibility thereof, and promote the bone growth.

Therefore, the utility model provides a self-adaptive interbody fusion cage, which is characterized by comprising a main body part and an elastic part arranged on the main body part, wherein the main body part is a porous body structure taking a three-dimensional network structure as a framework and is provided with an upper surface and a lower surface which are opposite; the elastic portion includes a plurality of elastic pieces formed on at least one of the upper surface and the lower surface of the main body portion and arranged in a two-dimensional direction, the elastic pieces having an elastic body with a gap therebetween.

In this case, after the intersomatic cage is implanted between the human body such as vertebrae, the elastic part is in direct contact with the vertebrae to receive pressure from the vertebrae, and since the elastic part includes a plurality of elastic pieces arranged in a two-dimensional direction along at least one of the upper and lower surfaces, the elastic part is easily adaptively stressed according to the surface of the vertebrae in contact with the intersomatic cage, thereby improving the clinical prosthetic effect of the intersomatic cage. In addition, since the intervertebral cage can stimulate the fusion surface of the vertebrae more uniformly, it has good bone induction property and can promote the bone to recover and grow.

In the intervertebral fusion device according to the present invention, a plurality of elastic pieces arranged in a two-dimensional direction may be formed on both the upper surface and the lower surface of the main body. In this case, since the elastic part includes a plurality of elastic pieces arranged in two-dimensional directions of the upper and lower surfaces, the elastic part is easily adaptively stressed according to the surfaces of the vertebrae contacting the intersomatic cage, thereby improving the clinical prosthetic effect of the intersomatic cage.

In addition, in the intervertebral fusion device according to the present invention, optionally, the plurality of elastic pieces include a first type elastic piece and a second type elastic piece, and the first type elastic piece and the second type elastic piece are disposed on the main body in a mesh-like manner. Therefore, the first elastic sheet and the second elastic sheet can be uniformly stressed.

Further, in the intervertebral cage of the present invention, optionally, the elastic piece has an elastic body and two end portions connected to the elastic body, and a distance between the two end portions of the elastic piece is adjustable. Therefore, the elasticity and the range of the elastic piece can be adjusted according to actual needs.

In addition, in the intervertebral fusion cage according to the present invention, the three-dimensional network structure may be formed of a plurality of network structure unit bodies, each of the network structure unit bodies may include a base point and a rib connecting the base points, and the plurality of network structure unit bodies may be arranged in order that the base points and the ribs overlap each other. Thereby, the network structure units can be closely arranged to obtain a three-dimensional network structure.

In addition, in the intervertebral fusion cage of the present invention, optionally, the main body portion is further filled with a degradable artificial bone. Therefore, the artificial bone can induce the growth of the bone, the artificial bone is degraded after promoting the growth of the bone, and a qi and blood passage is formed in the three-dimensional network structure, so that the obstruction of the qi and blood passage between the vertebrae is avoided, and the growth and the recovery of the bone are facilitated.

In addition, in the intervertebral fusion device according to the present invention, optionally, the main body may be formed of one or more of medical stainless steel, platinum, titanium alloy, titanium-nickel memory alloy, cobalt-chromium alloy, or magnesium alloy. Therefore, the process difficulty and the production cost can be reduced.

In addition, in the intervertebral fusion cage of the present invention, optionally, in the three-dimensional network structure, a plurality of the network structure unit bodies are communicated with each other. This enables the formation of a qi-blood channel and promotes the growth and recovery of bone tissue.

In addition, in the intervertebral fusion cage of the present invention, optionally, the elastic sheet is wavy, and the elastic sheet has two or more wave crests, and the wavy ripples of the first-type elastic sheet and the wavy ripples of the second-type elastic sheet are distributed in a staggered manner. Therefore, the stress can be uniformly dispersed, and the first elastic sheet and the second elastic sheet can be uniformly stressed.

In addition, in the intervertebral cage of the present invention, optionally, the main body portion and the elastic portion are detachably assembled together. This can improve the applicability of the intervertebral cage.

According to the utility model discloses, can provide the shape that can adapt to different intervertebral bones, increase its osteoinduction, promote the self-adaptation intervertebral fusion ware that the skeleton grows.

Drawings

Embodiments of the invention will now be explained in further detail by way of example only with reference to the accompanying drawings, in which:

fig. 1 is a schematic view showing a state of use of an intervertebral cage according to an embodiment of the present invention.

Fig. 2 is a perspective view illustrating an intervertebral cage according to an embodiment of the present invention.

Fig. 3 is a side view illustrating an intervertebral cage according to an embodiment of the present invention.

Fig. 4 is a three-dimensional network configuration diagram showing a main body portion of the intervertebral cage according to the embodiment of the present invention.

Fig. 5 is a schematic diagram of a network structure unit showing a three-dimensional network structure according to an embodiment of the present invention.

Fig. 6 is a perspective view showing the elastic portion according to the embodiment of the present invention.

Reference numerals:

1 … intervertebral fusion device, 2 … vertebrae, 10 … main body part, 11 … network structure unit body, 111 … base points, 112 … ribs, 20 … elastic parts, 21 … first-class elastic sheets and 22 … second-class elastic sheets.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and embodiments. In the drawings, the same components or components having the same functions are denoted by the same reference numerals, and redundant description thereof will be omitted.

Fig. 1 is a schematic view showing a state of use of an intervertebral cage 1 according to an embodiment of the present invention. Fig. 2 is a perspective view showing the intervertebral cage 1 according to the embodiment of the present invention. Fig. 3 is a side view showing the intervertebral cage 1 according to the embodiment of the present invention.

As shown in fig. 1, 2 and 3, the present invention provides an intervertebral cage 1 (also referred to as "cage 1") having an elastic part 20, which includes a main body 10 and an elastic part 20. The main body 10 is a porous body structure having a three-dimensional network structure as a skeleton, and has an upper surface and a lower surface opposite to each other. The elastic part 20 includes a plurality of elastic pieces formed on at least one of the upper surface and the lower surface of the body part 10 and arranged along the two-dimensional direction of the upper surface or the lower surface.

In this case, after the intersomatic cage 1 is implanted between the human body such as the vertebrae 2 (see fig. 1), the elastic part 20 is in direct contact with the vertebrae 2 to receive the pressure from the vertebrae 2, and since the elastic part 20 includes a plurality of elastic pieces arranged in a two-dimensional direction of the upper or lower surface, the elastic part 20 is easily adaptively stressed according to the surface of the vertebrae 2 in contact with the intersomatic cage 1, thereby improving the clinical prosthetic effect of the intersomatic cage 1. In addition, since the intervertebral cage 1 can stimulate the fusion surface of the vertebrae 2 more uniformly, it has good bone induction property and can promote bone restoration growth.

As shown in fig. 2, in some examples, the three-dimensional network structure may be formed by 3D printing. Thus, a complex three-dimensional network structure can be created using 3D printing techniques.

In other examples, the intersomatic cage 1 may be made by 3D printing. This enables the main body 10 and the elastic portion 20 to be integrally molded, thereby improving the structural stability of the intervertebral cage 1.

In other examples, the main body 10 and the elastic part 20 may be detachably assembled. In this case, the first-type spring plates 21 and the second-type spring plates 22 can be arranged in a targeted manner according to the different vertebrae 2 and the conditions of the vertebrae 2, so that the suitability of the intervertebral cage 1 can be increased.

Fig. 4 is a three-dimensional network configuration diagram showing the main body portion 10 of the intervertebral cage 1 according to the embodiment of the present invention. Fig. 5 is a schematic diagram of a network structure unit 11 showing a three-dimensional network structure according to an embodiment of the present invention.

As shown in fig. 4, in some examples, the three-dimensional network structure may be formed of a plurality of network structure unit bodies 11, the network structure unit bodies 11 being polyhedral structures, the network structure unit bodies 11 including base points 111 and ribs 112 connecting the respective base points 111, the plurality of network structure unit bodies 11 being sequentially arranged in such a manner that the base points 111 and the ribs 112 coincide. Thereby, the network structure units can be closely arranged to obtain a three-dimensional network structure.

In some examples, at least 3 ribs 112 are connected to one base point 111 in a three-dimensional network structure. Therefore, stress concentration can be reduced, and stress distribution of the internal structure of the interbody fusion cage 1 is more uniform.

As shown in fig. 5, in some examples, the network fabric unit cell 11 may be a dodecahedron structure. Specifically, the dodecahedron may be composed of several quadrangles. In other examples, a dodecahedron may also be composed of several triangles or pentagons.

Additionally, in some examples, the three-dimensional network structure may be an irregular structure.

In the present invention, the ribs 112 of the network structure unit 11 may be formed by 24 ribs 112 having the same length.

The utility model discloses in, three-dimensional network structure is bilayer structure, and every layer comprises about 21 network structure unit bodies 11, and the length is about 7 network structure unit bodies 11, and the width is about 3 network structure unit bodies 11. In this case, the three-dimensional network structure of the present invention exhibits a substantially flat shape, thereby enabling easy insertion into the intervertebral space.

In some examples, in a three-dimensional network structure, a plurality of network structure unit bodies 11 may be connected to each other. This enables the formation of a qi-blood channel and promotes the growth and recovery of bone tissue.

In some examples, in the three-dimensional network structure, a filler that promotes bone growth may be filled. In this case, bone growth can be induced, and at the same time, the three-dimensional network structure can serve as an osteoconductive scaffold, thereby promoting continuous bone growth.

In some examples, the body portion 10 is also filled with artificial bone (not shown). This can induce bone growth and promote recovery.

In some examples, the artificial bone may be bonded to the body portion 10 by means of thermocompression bonding. This enables the artificial bone to be firmly bonded to the intervertebral cage 1.

In some examples, the artificial bone may include a bioceramic particle and a degradable polyester material. Under the condition, the artificial bone can be degraded after promoting the growth of the bone, and a qi and blood passage is formed in the three-dimensional network structure, so that the obstruction of the qi and blood passage between the vertebras is avoided, and the growth and the recovery of the bone are facilitated.

In some examples, the bioceramic particles may include, for example, hydroxyapatite, tricalcium phosphate, and the like. In some examples, the degradable polyester material may include, for example, polylactic acid, polycaprolactone, copolymers thereof, and the like.

In some examples, the porosity of the body portion 10 may be 70% to 90%. In the present invention, the porosity of the main body 10 may be 80%. Therefore, the structure strength is ensured, and the circulation of qi and blood in the bone tissue is facilitated, so that the growth of the bone tissue is promoted.

In other examples, the body portion 10 may also be a solid structure. In this case, the structure of the main body portion 10 is more robust.

In some examples, the body portion 10 may be made of at least one of metal, ceramic, polymer. This enables the body 10 to be made of an appropriate material.

In some examples, the material of the body portion 10 may be selected from one or more of polylactic acid based material, polycaprolactone, polydioxanone, polyetheretherketone, polyglycolic acid. In addition, in some examples, the material of the main body 10 may also be selected from one or more of lactide, caprolactone, more than two random copolymers or block copolymers among p-dioxanone and glycolide. Further, in other examples, body portion 10 may also be comprised of one or more of Polyorthoesters (POE), polyamphosphine, polycaprolactone, polyester urethane, polyanhydride-imine copolymers, polyhydroxybutyrate and copolymers thereof, and polyamino acids (PAA).

In other examples, the body portion 10 may also be composed of one or more of medical stainless steel, platinum, titanium alloy, titanium-nickel memory alloy, cobalt-chromium alloy, or magnesium alloy. In this case, the material is relatively low in price and high in material strength as compared with the absorbable material, and thus, the process difficulty and the production cost can be reduced.

(elastic part)

Fig. 6 is a perspective view showing the elastic portion 20 according to the embodiment of the present invention.

In some examples, the elastic part 20 includes a plurality of elastic pieces formed on at least one of the upper surface and the lower surface of the body part 10 and arranged along a two-dimensional direction of the upper surface or the lower surface. In this case, when the upper or lower surface of the main body portion 10 is subjected to a force by contact with the vertebra 2, the elastic portion 20 can be elastically deformed to better adapt to the shape from the vertebra 2.

In the present invention, the elastic portion 20 is disposed on the upper surface and the lower surface of the main body portion 10, and the upper surface and the lower surface are provided with 4 elastic pieces.

As described above, the elastic portion 20 may be provided on both the upper and lower surfaces of the main body portion 10. In this case, the intervertebral cage 1 can induce stimulation to the bone simultaneously by the elastic parts 20 of the upper and lower surfaces, promoting the restoration of growth.

As shown in fig. 6, in some examples, the elastic piece has an elastic body and two end portions connected to the elastic body, the two end portions of the elastic piece are fixed to the main body portion 10, and a gap H (see fig. 4) is provided between the elastic body of the elastic piece and the main body portion 10. In this case, the elastic body of the elastic piece can move with a certain space, and thus, a cushioning effect can be achieved.

In some examples, both end portions of the elastic sheet may be fixed to the base points 111. In other examples, the elastic sheet may have three end points fixed to the main body 10. This can improve the stability of the elastic sheet.

In some examples, the distance between the two ends of the elastic sheet is adjustable. In this case, the elastic piece having a constant length has a different distance between the end points, and thus the elasticity and the range covered by the elastic piece are changed, and thus the elasticity and the range of the elastic piece can be adjusted according to actual needs.

In some examples, the resilient sheet is wavy, and the resilient portion 20 has more than two peaks. This enables the stress to be uniformly dispersed. In other examples, the elastic sheet may also have a circular arc shape, a saw-tooth shape, or other irregular shapes. In some examples, the height of the peaks may be different. In other examples, the elastic sheet may be symmetrical along a median line of its own length direction.

In other examples, the peaks of the resilient portion 20 may also exhibit a degree of tilt. In this case, the elastic portion 20 is inclined accordingly when the intervertebral cage 1 is subjected to pressure, so as to better conform to the bone.

In other examples, the wave-like peaks of the resilient sheet may include 3, 4, 5 or more peaks. In other examples, the heights of the peaks may be the same.

In some examples, the elastic pieces may be arranged along the length direction of the main body 10. In other examples, the elastic pieces may be arranged along the width direction of the body part 10. The present embodiment is not limited to this, and the elastic pieces may be arranged on the main body 10 in a scattered manner.

In some examples, the plurality of elastic sheets includes a first type elastic sheet 21 and a second type elastic sheet 22 which are arranged in parallel and are waved, and the waved waves of the first type elastic sheet 21 and the second type elastic sheet 22 are distributed alternately as viewed along a direction orthogonal to the length of the elastic sheets. This allows the first-type elastic pieces 21 and the second-type elastic pieces 22 to be uniformly stressed.

In the present invention, the length L1 of the first elastic sheet 21 is greater than the length L2 of the second elastic sheet 22.

In some examples, the first type elastic pieces 21 and the second type elastic pieces 22 may be alternately arranged on the main body portion 10.

In other examples, the first-type elastic sheet 21 and the second-type elastic sheet 22 may be provided on the main body portion 10 in an overlapping manner.

In addition, in some examples, stress concentrations may be reduced by increasing the number of spring blades on the body portion 10, resulting in a more uniform distribution of structural stresses within the interbody cage 1.

In other examples, the elastic portion 20 may be a strut, a spring, a buffer plate, or the like. This can increase the flexibility and selectivity of the structure of the elastic portion 20.

In some examples, the elastic portion 20 may be made of a material having a certain elasticity. Specifically, the elastic portion 20 may be made of one or more of metal, ceramic, and polymer. Thus, the elastic portion 20 having appropriate elasticity can be made by selecting an appropriate material. For example: metallic titanium, Polyetheretherketone (PEEK), and the like.

In other examples, the elastic part 20 may be made of the same material as that of the main body part 10.

In some examples, the first type of elastic sheet 21 and the second type of elastic sheet 22 may be made of different materials. In this way, the intervertebral cage 1 can be selected according to the situation.

In some examples, the first type elastic sheet 21 and the second type elastic sheet 22 may also be disposed on the main body portion 10 in an interlaced mesh.

While the present invention has been described in detail in connection with the drawings and the examples, it is to be understood that the above description is not intended to limit the present invention in any way. The present invention may be modified and varied as necessary by those skilled in the art without departing from the true spirit and scope of the invention, and all such modifications and variations are intended to be included within the scope of the invention.

Claims (10)

1. The self-adaptive interbody fusion cage is characterized by comprising a main body part and an elastic part arranged on the main body part, wherein the main body part is a porous body structure taking a three-dimensional network structure as a framework and is provided with an upper surface and a lower surface which are opposite; the elastic portion includes a plurality of elastic pieces formed on at least one of the upper surface and the lower surface of the main body portion and arranged in a two-dimensional direction, the elastic pieces having an elastic body with a gap therebetween.

2. An intersomatic cage according to claim 1, characterized in that:

a plurality of elastic pieces arranged in a two-dimensional direction are formed on both the upper surface and the lower surface of the main body portion.

3. An intersomatic cage according to claim 1 or 2, characterized in that:

the plurality of elastic pieces include a first type elastic piece and a second type elastic piece, and the first type elastic piece and the second type elastic piece are arranged on the main body in an interlaced net shape.

4. An intersomatic cage according to claim 1 or 2, characterized in that:

the elastic piece has an elastic body and two end portions connected to the elastic body, and a distance between the two end portions of the elastic piece is adjustable.

5. An intersomatic cage according to claim 1, characterized in that:

the three-dimensional network structure is composed of a plurality of network structure unit bodies, each network structure unit body comprises a base point and an edge connecting the base points, and the plurality of network structure unit bodies are sequentially arranged in a mode that the base points and the edges are overlapped.

6. An intersomatic cage according to claim 1, characterized in that:

the main body part is also filled with degradable artificial bone.

7. An intersomatic cage according to claim 1, characterized in that:

the main body part is made of one of medical stainless steel, platinum, titanium alloy, titanium-nickel memory alloy, cobalt-chromium alloy or magnesium alloy.

8. An intersomatic cage according to claim 5, characterized in that:

in the three-dimensional network structure, a plurality of network structure unit bodies are communicated with each other.

9. An intersomatic cage according to claim 3, characterized in that:

the elastic sheet is wavy, the elastic sheet is provided with more than two wave crests, and the wavy ripples of the first elastic sheet and the wavy ripples of the second elastic sheet are distributed in a staggered mode.

10. An intersomatic cage according to claim 1, characterized in that:

the main body portion and the elastic portion are detachably fitted together.

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