CN111938879B - Folding and unfolding type interbody fusion cage - Google Patents
Folding and unfolding type interbody fusion cage Download PDFInfo
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- CN111938879B CN111938879B CN202010826088.8A CN202010826088A CN111938879B CN 111938879 B CN111938879 B CN 111938879B CN 202010826088 A CN202010826088 A CN 202010826088A CN 111938879 B CN111938879 B CN 111938879B
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- shell
- unfolding
- folding
- upper shell
- lower shell
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2/4455—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
- A61F2/447—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
Abstract
The invention provides a folding and unfolding type interbody fusion cage, which comprises an upper shell, a lower shell, a plurality of unfolding devices and two folding and unfolding surfaces, wherein the upper shell is provided with a first opening and a second opening; the folding and unfolding surfaces are respectively connected between the upper shell and the lower shell and positioned on two sides of the upper shell and the lower shell; the upper shell, the lower shell and the folding and unfolding surface are matched to form a cavity, and the same end of the upper shell and the lower shell are matched to form an operation port communicated with the cavity; the upper shell and the lower shell are respectively provided with the unfolding devices; when the folding and unfolding type interbody fusion cage is not unfolded, the folding and unfolding surfaces are folded and stored in the cavity. The folding and unfolding type interbody fusion cage can be implanted into an intervertebral space in a small incision under the condition of not increasing the initial volume of the fusion cage, and then the transverse expansion of clinical requirements is attached to the appropriate position, so that the bony fusion area between the interior of the fusion cage and a vertebral body is enlarged.
Description
Technical Field
The invention relates to the technical field of interbody fusion cages, in particular to a folding and unfolding interbody fusion cage.
Background
Degenerative disc disease, lumbar instability, low back pain due to spondylolisthesis, and spinal instability due to extensive trauma have become one of the major causes of public health, leading to spinal disability, and the goal of treatment of spinal disease is to reduce low back pain and restore spinal stability.
Spinal fusion is one of the important methods for treating spinal diseases, and can be used for treating spinal instability and spondylolisthesis caused by degenerative change and trauma through operation, and can be used for reconstructing spinal mechanical stability by forming partial upper and lower segments into bony fusion. In recent years, intervertebral fusion cage has been developed to improve the bone graft fusion rate, reduce the dependency on external fixation, and improve and maintain the curvature of the spine.
Good intervertebral fusion results rely on the formation of a strong bony connection between the upper and lower vertebral bodies, i.e., bony fusion, rather than relying solely on implants or fusion cages to provide support. The larger volume implant is less likely to sag or embed into the vertebral body in the intervertebral space because the larger volume implant is prone to transmit axial compressive stresses to the surroundings. Theoretically, the fusion cage has larger volume, larger contact area with the end plate and larger implanted bone mass, thereby improving the stability between vertebral bodies, preventing subsidence and increasing the fusion rate.
Patent No. 201720993617.7 entitled "intervertebral cage and auxiliary component for expanding the cage", which is butted with an opening of the intervertebral cage through the auxiliary component, so that a push rod slides in a sliding tube cavity, thereby transversely expanding the intervertebral cage; but is essentially limited by the axial structure at the far end of the fusion cage, the area of the intervertebral fusion cage which can be increased only by proximal opening is small, and the proximal section is increased to easily damage peripheral nerve vessels and the like.
The patent number '201920227546.9' is named as 'distractable fusion cage', which increases the height of the fusion cage and the bone grafting space through the action of a connecting rod; however, the height is only increased, but the contact area between the fusion cage and the vertebral body cannot be increased, and the fusion rate cannot be really and effectively improved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a folding and unfolding type interbody fusion cage, which can implant intervertebral space in a small incision under the condition of not increasing the initial volume of the fusion cage, and then can be attached to the lateral expansion of clinical requirements after reaching a proper position, so that the bony fusion area between the interior of the fusion cage and a vertebral body is enlarged.
In order to achieve the above object, the present invention provides a folding and unfolding type intervertebral fusion device, comprising an upper shell, a lower shell, a plurality of unfolding devices and two folding and unfolding surfaces; the folding and unfolding surfaces are respectively connected between the upper shell and the lower shell and positioned at two sides of the upper shell and the lower shell; the upper shell, the lower shell and the folding and unfolding surface are matched to form a cavity, and the same end of the upper shell and the lower shell are matched to form an operation port communicated with the cavity; the upper shell and the lower shell are respectively provided with the unfolding devices; when the folding and unfolding type interbody fusion cage is not unfolded, the folding and unfolding surface is folded and contained in the cavity.
Preferably, the upper case includes an upper case upper surface, two upper case side surfaces, an upper case front surface and an upper case rear surface; the upper shell side surface is connected to both sides of the upper surface of the upper shell, the upper shell front surface is connected to the front side of the upper surface of the upper shell, and the upper shell rear surface is connected to the rear side of the upper surface of the upper shell; the unfolding device is connected between the upper surface of the upper shell and the side surfaces of the two upper shells respectively, and a first semicircular notch is formed in the front surface of the upper shell.
Preferably, the lower case includes a lower case lower surface, two lower case lateral surfaces, a lower case front surface and a lower case rear surface; the lower shell side surface is connected with two sides of the lower surface of the lower shell, the lower shell front surface is connected with the front side of the lower surface of the lower shell, and the lower shell rear surface is connected with the rear side of the lower surface of the lower shell; the lower surface of the lower shell and the lateral surfaces of the two lower shells are respectively connected with one unfolding device; the front surface of the lower shell is provided with a second semicircular notch, and the first semicircular notch and the second semicircular notch are matched to form the operation opening.
Preferably, the upper case upper surface, the upper case side surface, the lower case lower surface and/or the lower case side surface form a plurality of anti-escape ratchets.
Preferably, the folded and unfolded surface comprises a first folded and unfolded panel and a second folded and unfolded panel which are connected; the first folding and unfolding panel and the second folding and unfolding panel are in the shape of a lath with the same shape; when the folding and unfolding type interbody fusion cage is not unfolded, the outer side surfaces of the first folding and unfolding panel and the second folding and unfolding panel are fittingly accommodated in the cavity.
Preferably, adjacent edges of the first folded and unfolded panel and the second folded and unfolded panel respectively form a concave structure and a convex structure which are matched with each other; when the folding-unfolding type interbody fusion cage is unfolded, the first folding-unfolding panel and the second folding-unfolding panel are positioned in the same plane, and the concave structures and the convex structures are matched with each other.
Preferably, the deployment device comprises a snap post, a snap post pull wire and a snap spring; the buckling column is clamped between the upper surface of the upper shell and the outer adjacent end surface of the side surface of the upper shell or between the lower surface of the lower shell and the outer adjacent end surface of the side surface of the lower shell; the buckle column pull wire is connected to the end part of the buckle column; the snap spring is connected between the upper surface of the upper housing and the inner surface of the side surface of the upper housing or between the lower surface of the lower housing and the inner surface of the side surface of the lower housing.
Preferably, the cross section of the buckling column is square, and two adjacent side surfaces of the buckling column are respectively attached to the adjacent end surfaces of the outer sides of the upper surface of the upper shell and the side surface of the upper shell or the lower surface of the lower shell and the adjacent end surfaces of the outer sides of the side surface of the lower shell.
Preferably, the middle parts of the upper shell and the lower shell form a hollow structure.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
the invention provides a folding and unfolding type interbody fusion cage, which can increase the bone grafting amount under the condition that the original volume of the interbody fusion cage is not changed by matching an upper shell, a lower shell, an unfolding device and two folding and unfolding surfaces, improve the interbody fusion rate, and simultaneously can be implanted into the interbody fusion cage only by adopting a small incision or minimally invasive mode, thereby increasing the implantation safety.
Drawings
FIG. 1 is a schematic view of a folded-out intervertebral cage according to an embodiment of the present invention;
FIG. 2 is a schematic partial cross-sectional view of a collapsed deployment cage according to an embodiment of the invention shown in an undeployed configuration;
FIG. 3 is a schematic view, partially in cross-section, of an expanded collapsed deployment cage according to an embodiment of the present invention;
fig. 4 is a schematic view of a connection structure of the unfolding apparatus and the upper housing according to the embodiment of the invention.
Detailed Description
The following description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings of fig. 1 to 4, and will make the functions and features of the present invention better understood.
Referring to fig. 1 and 4, a folded and unfolded type interbody fusion cage according to an embodiment of the present invention includes an upper shell 1, a lower shell 2, a plurality of unfolding devices 3, and two folded and unfolded surfaces 4; the folding and unfolding surfaces 4 are respectively connected between the upper shell 1 and the lower shell 2 and positioned at two sides of the upper shell 1 and the lower shell 2; the upper shell 1, the lower shell 2 and the folding and unfolding surface 4 are matched to form a cavity, and the same end of the upper shell 1 and the lower shell 2 is matched to form an operation port 5 communicated with the cavity; the upper shell 1 and the lower shell 2 are respectively provided with a spreading device 3; when the folded and unfolded type interbody fusion cage is not unfolded, the folded and unfolded surface 4 is folded and contained in the cavity.
The cavity is used for accommodating bone particles. The folding and unfolding surface 4 in the folding state can be unfolded through the matching of the unfolding device 3 and the upper shell 1 or the lower shell 2, and meanwhile, the increase of the bone contact area of the fusion cage and the increase of the bone grafting capacity are realized. The operation opening 5 is used for the access of a common distraction tool to realize longitudinal distraction.
In this embodiment, the middle parts of the upper casing 1 and the lower casing 2 form a hollow structure. The bone fusion cage is suitable for direct contact of bone particles with the upper surface and the lower surface of a vertebral body, better bony fusion is realized, and the hollow structure is not limited to a plane shape.
The upper case 1 includes an upper case upper surface 11, two upper case side surfaces 12, an upper case front surface 13, and an upper case rear surface; upper case side surfaces 12 are attached to both sides of the upper case upper surface 11, an upper case front surface 13 is attached to the front side of the upper case upper surface 11, and an upper case rear surface is attached to the rear side of the upper case upper surface 11; an unfolding device 3 is respectively connected between the upper surface 11 of the upper shell and the side surfaces 12 of the two upper shells; the upper housing front surface 13 defines a first semi-circular notch 51.
The upper surface 11 of the upper shell, the side surface 12 of the upper shell, the front surface 13 of the upper shell and the rear surface of the upper shell are oval or rectangular, and the three parts are vertically intersected to form a three-dimensional structure.
Referring to fig. 1 to 4, the lower housing 2 includes a lower housing lower surface 21, two lower housing lateral surfaces 22, a lower housing front surface 23 and a lower housing rear surface; lower shell side surfaces 22 are attached to both sides of the lower shell lower surface 21, a lower shell front surface 23 is attached to the front side of the lower shell lower surface 21, and a lower shell rear surface is attached to the rear side of the lower shell lower surface 21; a developing device 3 is respectively connected between the lower shell lower surface 21 and the two lower shell lateral surfaces 22; the lower case front surface 23 forms a second semicircular notch 52, and the first semicircular notch 51 and the second semicircular notch 52 cooperate to form the operation opening 5.
The lower surface 21 of the lower shell, the lateral surface 22 of the lower shell, the front surface 23 of the lower shell and the rear surface of the lower shell are in an oval or rectangular shape, and the three parts are perpendicularly intersected to form a three-dimensional structure.
In the present embodiment, the upper case upper surface 11, the upper case side surface 12, the lower case lower surface 21, and the lower case side surface 22 form a plurality of escape-preventing ratchet teeth 6. The withdrawal prevention ratchet 6 is used to prevent the collapsed deployment interbody fusion cage from being withdrawn.
The folded and unfolded surface 4 comprises a first folded and unfolded panel 41 and a second folded and unfolded panel 42 which are connected; the first folded and unfolded panel 41 and the second folded and unfolded panel 42 are in the shape of a strip having the same shape; when the folded and unfolded type intervertebral fusion device is not unfolded, the outer side surfaces of the first folded and unfolded panel 41 and the second folded and unfolded panel 42 are snugly accommodated in the cavity.
The adjacent edges of the first folded and unfolded panel 41 and the second folded and unfolded panel 42 form a concave structure and a convex structure respectively, which are matched with each other; when the folded and unfolded type interbody fusion cage is unfolded, the first folded and unfolded panel 41 and the second folded and unfolded panel 42 are positioned in the same plane, the concave structures and the convex structures are matched with each other, and the structure can keep a lath-shaped stable state after being butted.
The unfolding means 3 comprises a latch post 31, a latch post wire 32 and a latch spring 33; the buckling column 31 is clamped between the upper surface 11 of the upper shell and the outer adjacent end surface of the side surface 12 of the upper shell or between the lower surface 21 of the lower shell and the outer adjacent end surface of the side surface 22 of the lower shell; the buckle column pull wire 32 is connected to the end part of the buckle column 31; the snap springs 33 are connected between the upper housing upper surface 11 and the inner surface of the upper housing side surface 12 or between the lower housing lower surface 21 and the inner surface of the lower housing side surface 22.
The cross section of the buckling column 31 is square, and two adjacent side surfaces of the buckling column 31 are respectively attached to the adjacent end surfaces of the outer sides of the upper shell upper surface 11 and the upper shell side surface 12 or the adjacent end surfaces of the outer sides of the lower shell lower surface 21 and the lower shell side surface 22, so that the vertical relation between the two surfaces is stabilized.
The buckling column pull wire 32 is used for taking the buckling column 31 out of the original position when being pulled; the latch spring 33 is used to push the upper housing side surface 12 out of a perpendicular relationship to the upper housing upper surface 11 to a parallel relationship and the lower housing side surface 22 out of a perpendicular relationship to the lower housing lower surface 21 to a parallel relationship when the latch post 31 is pulled out away from the home position, enabling deployment of the deployment device 3.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (5)
1. A folding and unfolding type interbody fusion cage is characterized by comprising an upper shell, a lower shell, a plurality of unfolding devices and two folding and unfolding surfaces; the folding and unfolding surfaces are respectively connected between the upper shell and the lower shell and positioned at two sides of the upper shell and the lower shell; the upper shell, the lower shell and the folding and unfolding surface are matched to form a cavity, and the same end of the upper shell and the lower shell are matched to form an operation port communicated with the cavity; the upper shell and the lower shell are respectively provided with the unfolding devices; when the folded and unfolded type interbody fusion cage is not unfolded, the folded and unfolded surface is folded and stored in the cavity;
the upper shell comprises an upper shell upper surface, two upper shell side surfaces, an upper shell front surface and an upper shell rear surface; the upper shell side surface is connected to both sides of the upper surface of the upper shell, the upper shell front surface is connected to the front side of the upper surface of the upper shell, and the upper shell rear surface is connected to the rear side of the upper surface of the upper shell; the unfolding devices are respectively connected between the upper surface of the upper shell and the side surfaces of the two upper shells, and a first semicircular notch is formed in the front surface of the upper shell;
the lower shell comprises a lower shell lower surface, two lower shell lateral surfaces, a lower shell front surface and a lower shell rear surface; the lower shell lateral surface is connected to two sides of the lower shell lower surface, the lower shell front surface is connected to the front side of the lower shell lower surface, and the lower shell rear surface is connected to the rear side of the lower shell lower surface; the lower surface of the lower shell and the lateral surfaces of the two lower shells are respectively connected with the unfolding device; the front surface of the lower shell is provided with a second semicircular notch, and the first semicircular notch and the second semicircular notch are matched to form the operation opening;
the folding and unfolding surface comprises a first folding and unfolding panel and a second folding and unfolding panel which are connected; the first folding and unfolding panel and the second folding and unfolding panel are in the shape of a lath with the same shape; when the folding and unfolding type interbody fusion cage is not unfolded, the outer side surfaces of the first folding and unfolding panel and the second folding and unfolding panel are fittingly accommodated in the cavity;
the first folded and unfolded panel and the second folded and unfolded panel are connected between the upper shell side surface and the lower shell side surface;
adjacent edges of the first folded and unfolded panel and the second folded and unfolded panel respectively form a concave structure and a convex structure which are matched with each other; when the folding-unfolding type interbody fusion cage is unfolded, the first folding-unfolding panel and the second folding-unfolding panel are positioned in the same plane, and the concave structures and the convex structures are matched with each other.
2. The folder-expanded intersomatic cage of claim 1, wherein the upper shell upper surface, the upper shell side surface, the lower shell lower surface and/or the lower shell side surface form a plurality of anti-exit ratchets.
3. The folder-expanded interbody fusion cage of claim 1 or 2, wherein the expansion means comprises a snap post, a snap post pull wire, and a snap spring; the buckling column is clamped between the upper surface of the upper shell and the outer adjacent end surface of the side surface of the upper shell or between the lower surface of the lower shell and the outer adjacent end surface of the side surface of the lower shell; the buckle column pull wire is connected to the end part of the buckle column; the snap spring is connected between the upper surface of the upper housing and the inner surface of the side surface of the upper housing or between the lower surface of the lower housing and the inner surface of the side surface of the lower housing.
4. The folded and unfolded interbody fusion cage of claim 3, wherein the cross-section of the buckling column is square, and two adjacent side surfaces of the buckling column are respectively attached to the adjacent end surfaces of the upper surface of the upper shell and the side surfaces of the upper shell or the adjacent end surfaces of the lower surface of the lower shell and the side surfaces of the lower shell.
5. The folder-expanded interbody cage of claim 4, wherein the upper and lower shells define an hollowed-out structure in a central portion thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010826088.8A CN111938879B (en) | 2020-08-17 | 2020-08-17 | Folding and unfolding type interbody fusion cage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010826088.8A CN111938879B (en) | 2020-08-17 | 2020-08-17 | Folding and unfolding type interbody fusion cage |
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| Publication Number | Publication Date |
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| CN111938879A CN111938879A (en) | 2020-11-17 |
| CN111938879B true CN111938879B (en) | 2023-03-28 |
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| CN202010826088.8A Active CN111938879B (en) | 2020-08-17 | 2020-08-17 | Folding and unfolding type interbody fusion cage |
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Citations (4)
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| CN103561691A (en) * | 2011-03-30 | 2014-02-05 | 三位一体整形有限责任公司 | Articulating interbody cage and methods thereof |
| CN103687575A (en) * | 2010-10-05 | 2014-03-26 | 摩根·P·洛里奥 | Intervertebral device and methods of use |
| CN106137473A (en) * | 2016-08-10 | 2016-11-23 | 邹德威 | Lumbar vertebral posterior multi-functional Intervertebral disc fusion device |
| WO2018016682A1 (en) * | 2016-07-21 | 2018-01-25 | 강릉원주대학교산학협력단 | Expandable cage for surgical operation |
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| EP2378990B1 (en) * | 2008-12-22 | 2018-05-16 | Synthes GmbH | Expandable interspinous process spacer |
| US9204907B2 (en) * | 2010-07-15 | 2015-12-08 | Kamran Aflatoon | Dynamic inter-spinous process spacer |
| WO2014158619A1 (en) * | 2013-03-12 | 2014-10-02 | Lorio Morgan Packard | Vertically expandable intervertebral cage, deployment devices, and methods of using the same |
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2020
- 2020-08-17 CN CN202010826088.8A patent/CN111938879B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103687575A (en) * | 2010-10-05 | 2014-03-26 | 摩根·P·洛里奥 | Intervertebral device and methods of use |
| CN103561691A (en) * | 2011-03-30 | 2014-02-05 | 三位一体整形有限责任公司 | Articulating interbody cage and methods thereof |
| WO2018016682A1 (en) * | 2016-07-21 | 2018-01-25 | 강릉원주대학교산학협력단 | Expandable cage for surgical operation |
| CN106137473A (en) * | 2016-08-10 | 2016-11-23 | 邹德威 | Lumbar vertebral posterior multi-functional Intervertebral disc fusion device |
Non-Patent Citations (1)
| Title |
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| 帽式颈椎椎间融合器的生物力学性能研究;顾宇彤 等;《中国脊柱脊髓杂志》;20050210;第15卷(第02期);第98-101页 * |
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