CN110464516B - an intervertebral fusion device - Google Patents
an intervertebral fusion device Download PDFInfo
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- CN110464516B CN110464516B CN201910830299.6A CN201910830299A CN110464516B CN 110464516 B CN110464516 B CN 110464516B CN 201910830299 A CN201910830299 A CN 201910830299A CN 110464516 B CN110464516 B CN 110464516B
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- 230000004927 fusion Effects 0.000 title abstract description 68
- 230000007480 spreading Effects 0.000 claims abstract description 10
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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
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
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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
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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
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
- A61F2002/3006—Properties of materials and coating materials
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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
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
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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
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30518—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements with possibility of relative movement between the prosthetic parts
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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
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/30772—Apertures or holes, e.g. of circular cross section
- A61F2002/30784—Plurality of holes
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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
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2002/3093—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth for promoting ingrowth of bone tissue
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Heart & Thoracic Surgery (AREA)
- Cardiology (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Prostheses (AREA)
Abstract
本发明涉及一种椎间融合器，包括融合器主体和片状撑开部，其中融合器主体包括相互铰接的上支撑部和下支撑部，上支撑部的下表面和/或下支撑部的上表面开设有容置槽，以用于片状撑开部处于水平状态时容纳于容置槽内；下支撑部的上表面还开设有支撑槽，以用于片状撑开部处于竖立状态时卡持于支撑槽内，容置槽包括延伸至上支撑部和/或下支撑部的侧边缘的开口，以用于通过开口使片状撑开部能够从水平状态旋转至竖立状态，从而将融合器主体撑开。本发明的椎间融合器不但能够在手术时极大地减小对人体的损伤，而且结构简单、操作方便，能够适用于腰椎侧前方入路的椎间融合手术。
The invention relates to an intervertebral cage, comprising a cage main body and a sheet-shaped spreading part, wherein the cage main body comprises an upper support part and a lower support part hinged to each other, the lower surface of the upper support part and/or the lower support part The upper surface is provided with an accommodating groove, which is used for the sheet-shaped stretcher to be accommodated in the accommodating groove when it is in a horizontal state; the upper surface of the lower support portion is also provided with a support groove, so that the sheet-shaped stretcher is in an upright state The accommodating groove includes openings extending to the side edges of the upper support part and/or the lower support part, so as to enable the sheet-like stretcher to rotate from a horizontal state to an upright state through the opening, so as to The fusion body is propped open. The intervertebral fusion device of the invention can not only greatly reduce the damage to the human body during the operation, but also has a simple structure and convenient operation, and can be suitable for the intervertebral fusion operation of the lumbar vertebrae anterior approach.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to an intervertebral fusion cage.
Background
The lumbar vertebra side anterior approach intervertebral Fusion (OLIF) is a newer spine surgical operation mode, the approach injury of the operation mode is small, an intervertebral Fusion device with a larger volume can be implanted, bone grafting osseous Fusion is facilitated, the intervertebral space height and the balance of the lordosis and the coronal plane can be better recovered, and meanwhile, the pressure can be indirectly reduced, so that nerve injury and adhesion are reduced. In the case of a patient suffering from kyphosis, the space between the two vertebral bodies is small at the side near the front side of the body and large at the side near the rear side of the body, and if an intervertebral cage of equal thickness is implanted, the spinal correction effect is not achieved.
There is an intervertebral cage for kyphosis, which has a first side with a large thickness and a second side with a small thickness, and is disposed close to the front side of the patient's body and the second side is disposed close to the rear side of the patient's body when being implanted between two vertebral bodies. If the deformity is corrected, the thickness of the first side of the cage must be larger than the current intervertebral space height, which may cause interference between the upper vertebral body and the lower vertebral body when the cage is implanted, thereby easily causing damage to the end plates of the vertebral bodies.
In addition, although the intervertebral fusion cage aiming at the kyphosis can reduce the damage to the vertebral body end plate to a certain extent, the intervertebral fusion cage has complex structure and complex operation, and can be implanted only from the back approach of the lumbar vertebra, so that the intervertebral fusion cage is not suitable for the intervertebral fusion operation of the front approach of the side of the lumbar vertebra and is not convenient for implanting the intervertebral fusion cage with larger volume.
Disclosure of Invention
The invention aims to provide an interbody fusion cage suitable for an interbody fusion operation of lumbar lateral anterior approach, which can overcome the defects in the prior art, and can restore the normal intervertebral space height and the normal lordosis of a kyphotic spine on the premise of not damaging vertebral end plates.
One embodiment of the invention provides an interbody fusion cage, which comprises a fusion cage main body and a sheet-shaped strutting part, wherein the fusion cage main body comprises an upper strutting part and a lower strutting part which are hinged with each other, and the lower surface of the upper strutting part is provided with a containing groove for containing the sheet-shaped strutting part in the containing groove when the sheet-shaped strutting part is in a horizontal state; the upper surface of the lower supporting part is also provided with a supporting groove for clamping the sheet-shaped strutting part in the supporting groove when the sheet-shaped strutting part is in a vertical state; the container groove includes an opening extending to a side edge of the upper support part and/or the lower support part for enabling the sheet-like expanding part to rotate from a horizontal state to an upright state through the opening, thereby expanding the fusion cage main body.
Another embodiment of the present invention provides an interbody fusion cage, including a fusion cage main body and a sheet-like distraction portion, wherein the fusion cage main body includes an upper support portion and a lower support portion hinged to each other, and an accommodating groove is formed in an upper surface of the lower support portion for accommodating the sheet-like distraction portion in the accommodating groove when the sheet-like distraction portion is in a horizontal state; the upper surface of the lower supporting part is also provided with a supporting groove for clamping the sheet-shaped strutting part in the supporting groove when the sheet-shaped strutting part is in a vertical state; the container groove includes an opening extending to a side edge of the upper support portion and/or the lower support portion for allowing the sheet expanding portion to rotate from a horizontal state to an upright state through the opening, thereby expanding the cage main body.
Another embodiment of the present invention provides an interbody fusion cage, which includes a fusion cage main body and a sheet-shaped distraction portion, wherein the fusion cage main body includes an upper support portion and a lower support portion hinged to each other, and both a lower surface of the upper support portion and an upper surface of the lower support portion are provided with accommodating grooves for accommodating the sheet-shaped distraction portion in the accommodating grooves when the sheet-shaped distraction portion is in a horizontal state; the upper surface of the lower supporting part is also provided with a supporting groove for clamping the sheet-shaped strutting part in the supporting groove when the sheet-shaped strutting part is in a vertical state; the container groove includes an opening extending to a side edge of the upper support portion and/or the lower support portion for allowing the sheet expanding portion to rotate from a horizontal state to an upright state through the opening, thereby expanding the cage main body.
In an embodiment of the present invention, the upper surface of the lower supporting portion is provided with an accommodating groove, and the supporting groove is located in the accommodating groove.
In one embodiment of the present invention, a plurality of support grooves may be formed in the upper surface of the lower support portion to allow different expansion angles of the upper support portion and the lower support portion to be achieved by sheet-shaped expansion portions of the same specification.
In one embodiment of the present invention, the lower surface of the upper support part is provided with a limit step against which the upper side edge of the sheet-like opening part abuts when the fusion cage main body is in the expanded state, thereby preventing the sheet-like opening part from sliding along the lower surface of the upper support part.
In an embodiment of the present invention, the lower surface of the upper supporting portion is provided with a receiving groove. At this time, the limiting step can be an inner side wall of the accommodating groove.
In one embodiment of the present invention, a separate opening may be provided in the upper support portion and/or the lower support portion in a direction different from the extending direction of the receiving groove. In other words, the opening is not formed by extending the receiving groove, but is an opening separately established at a position where the side edge of the upper support portion and/or the lower support portion is deviated from the receiving groove.
In one embodiment of the invention, one end of the sheet-shaped distraction portion is provided with a plurality of baffles, and each baffle is provided with one or more mounting holes for fixing the sheet-shaped distraction portion on the inferior vertebral body and the superior vertebral body simultaneously through the mounting holes.
In one embodiment of the invention, only one larger mounting hole may be provided on each baffle plate, so that screws of 40 mm length and 6 mm diameter may be used to screw into the vertebral bodies to achieve immediate stability of the intervertebral cage.
In one embodiment of the invention, the sheet-like expansile is provided with a plurality of micropores. The micropores can be uniformly distributed or non-uniformly distributed; the shape of the micro-pores may be circular, elliptical, polygonal, etc.
In one embodiment of the present invention, the plurality of minute holes provided on the sheet-like spreading portion are circular holes having a diameter of 230 to 280 μm. In a preferred embodiment, the pores are circular holes having a diameter of 250 microns.
In one embodiment of the invention, the plate-like struts are coated with a titanium bead coating to better achieve bone ingrowth and long term stability.
In one embodiment of the present invention, the sheet-like expanding portion has a length equal to that of the upper support portion and the lower support portion.
According to the interbody fusion cage, the height of one side of the interbody fusion cage is easy to realize to be larger, and the height of the other side of the interbody fusion cage is easy to realize to correct the kyphosis of a patient. According to the interbody fusion cage, the distraction operation of the fusion cage can be realized from the side surface of the fusion cage, so that the interbody fusion cage can be suitable for the interbody fusion operation of lumbar vertebra side front approach. According to the interbody fusion cage, the orthodontic effect is realized by adopting the mode of firstly implanting between two vertebral bodies and then expanding between the two vertebral bodies, and in the process of expanding the upper and lower supporting parts through the rotating sheet-shaped expanding part, the stress is mainly concentrated between the upper and lower supporting parts and the sheet-shaped expanding part instead of between the upper and lower supporting parts and the vertebral bodies, so that the risk of damaging the vertebral end plates is greatly reduced. The interbody fusion cage has simple structure and convenient operation, not only saves the manufacturing cost of the interbody fusion cage, but also can greatly shorten the operation time.
Drawings
Other features, objects and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments thereof, read in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic view of an overall structure of an intervertebral cage according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a main body of an intervertebral cage according to an embodiment of the invention, in which receiving grooves are formed only on the lower surface of an upper support;
FIG. 3 is a schematic structural view of a main body of an intervertebral cage according to an embodiment of the invention, wherein only an accommodating groove is formed on an upper surface of a lower support;
FIG. 4 is a schematic structural view of a main body of an intervertebral fusion device according to an embodiment of the invention, wherein a receiving groove is formed on both the lower surface of the upper support and the upper surface of the lower support;
FIG. 5 is a side view of the body of the intervertebral cage, with the support slots positioned within the receiving slots and sharing an interior sidewall, according to an embodiment of the disclosure;
FIG. 6 is a side view of the main body of the intervertebral cage according to an embodiment of the disclosure, wherein the support slot is located in the receiving slot;
FIG. 7 is a side view of the body of the intervertebral cage according to an embodiment of the invention, in which the support slots and the receiving slots are separated from each other;
FIG. 8 is a side view of the body of the intervertebral cage with a plurality of support slots formed in the upper surface of the lower support portion according to an embodiment of the disclosure;
FIG. 9 is a side view of the main body of the intervertebral fusion device according to an embodiment of the disclosure, wherein the limiting step and the receiving groove share an inner sidewall;
figure 10 is a schematic view of an overall structure of an intervertebral cage according to an embodiment of the invention with a stop in one side of a distractor in a lamina.
Detailed Description
In the following detailed description of the specific embodiments, reference is made to the accompanying drawings, which form a part hereof. The accompanying drawings illustrate, by way of example, specific embodiments in which the invention may be practiced. The exemplary embodiments are not intended to be exhaustive of all embodiments according to the invention. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the spirit and scope of the present invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.
Fig. 1 is a schematic view showing the overall structure of an intervertebral cage according to an embodiment of the present invention. As shown in fig. 1, in an embodiment of the present invention, there is provided an interbody fusion cage suitable for lumbar lateral anterior approach interbody fusion surgery, the interbody fusion cage including a cage body 10 and a sheet-shaped distraction portion 13, wherein the cage body 10 includes an upper support portion 12 and a lower support portion 11 hinged to each other, and a receiving groove 14 is formed on a lower surface of the upper support portion 12 and an upper surface of the lower support portion 11 for receiving the sheet-shaped distraction portion 13 in the receiving groove 14 when the sheet-shaped distraction portion 13 is in a horizontal state; the upper surface of the lower supporting part 11 is further provided with a supporting groove 15, so that when the sheet-shaped opening part 13 is in a vertical state, the sheet-shaped opening part 13 is clamped in the supporting groove 15; the accommodating groove 14 includes an opening 16 extending to the side edges of the upper support portion 12 and the lower support portion 11 for allowing the sheet expanding portion 13 to rotate from the horizontal state to the upright state through the opening 16, thereby expanding the cage main body 10.
In one embodiment of the present invention, the upper support part 12 and the lower support part 11 may be hinged by a hinge shaft (not shown), and the upper support part 12 and the lower support part 11 may be rotatable about the hinge shaft. In one embodiment, the hinge shaft may be a separate hinge shaft separated from the upper support part 12 and the lower support part 11 by being engaged with a shaft hole provided at one side of the upper support part 12 and the lower support part 11. In another embodiment, the hinge shaft is a hinge shaft integrally formed with the upper support portion 12, and the hinge shaft is hinged by fitting a shaft hole provided at one side of the lower support portion 11. In still another embodiment, the hinge shaft is a hinge shaft integrally formed with the lower support portion 11, and the hinge shaft is hinged by fitting a shaft hole provided at one side of the upper support portion 12. The hinge of the present invention is not limited to the specific embodiments described above.
In an embodiment of the present invention, when the intervertebral cage is not in the distracted state, the lower surface of the upper support 12 and the upper surface of the lower support 11 may overlap with each other, or there may be a gap therebetween, which is not limited by the present invention.
In an embodiment of the present invention, the depth of the receiving groove 14 may be equal to the thickness of the sheet-shaped spreading portion 13, or may be smaller or larger than the thickness of the sheet-shaped spreading portion 13, which is not limited in the present invention. Specifically, when the receiving groove 14 is provided only on the lower surface of the upper support portion 12 or only on the upper surface of the lower support portion 11, the depth of the receiving groove 14 may be equal to the thickness of the sheet expanding portion 13, or may be appropriately greater than or less than the thickness of the sheet expanding portion 13, and when the receiving groove 14 is provided on the lower surface of the upper support portion 12 and the upper surface of the lower support portion 11, the sum of the depth of the receiving groove 14 on the lower surface of the upper support portion 12 and the depth of the receiving groove 14 on the upper surface of the lower support portion 11 may be equal to the thickness of the sheet expanding portion 13, or may be appropriately greater than or less than the thickness of the. In the present invention, the sheet-like spreading portion 13 is accommodated in the accommodating groove 14, which does not mean that the sheet-like spreading portion 13 is completely accommodated in the accommodating groove 14, and may include that a part of the sheet-like spreading portion 13 is accommodated in the accommodating groove 14.
In an embodiment of the present invention, the width of the accommodating groove 14 may be equal to the width of the sheet expanding portion 13, or may be appropriately larger than the width of the sheet expanding portion 13, as long as the sheet expanding portion 13 can be accommodated in the accommodating groove when in the horizontal state, which is not limited in the present invention.
In an embodiment of the present invention, the sheet-shaped expanding portion 13 is held in the supporting groove 15, which does not mean that only when the sheet-shaped expanding portion 13 is held, the outer side surface of the sheet-shaped expanding portion 13 is tightly fitted with the inner side surface of the supporting groove 15, and an appropriate gap is provided between the outer side surface of the sheet-shaped expanding portion 13 and the inner side surface of the supporting groove 15, which is not limited in the present invention.
In an embodiment of the present invention, the sheet-shaped expanding portion 13 is held in the supporting groove 15, which does not mean that only when the sheet-shaped expanding portion 13 is held, the outer side surface of the sheet-shaped expanding portion 13 is tightly fitted with the inner side surface of the supporting groove 15, and an appropriate gap is provided between the outer side surface of the sheet-shaped expanding portion 13 and the inner side surface of the supporting groove 15, which is not limited in the present invention.
In the present invention, the lateral direction refers to an extending direction of the hinge shaft of the upper support part 12 and/or the lower support part 11. The side edge of the upper support 12 and/or the lower support 11 refers to a lateral edge of the upper support 12 and/or the lower support 11.
In one embodiment of the present invention, a separate opening may be provided in the upper support portion and/or the lower support portion in a direction different from the extending direction of the receiving groove. In other words, the opening is not formed by extending the receiving groove, but is an opening separately established at a position where the side edge of the upper support portion and/or the lower support portion is deviated from the receiving groove.
In the embodiment of the present invention, the specific material of the fusion cage body 10 is preferably polyetheretherketone; the specific material of the sheet-like spreading portion 13 is preferably a titanium alloy material. In the embodiment of the present invention, the thickness of the fusion cage body 10 is about 10mm, that is, the thickness of each of the upper support part 12 and the lower support part 11 is about 5 mm. Thus, when the intervertebral fusion cage is in the distraction state, one side of the upper support part and the lower support part which are hinged is kept about 10mm, and the other side can use the sheet distraction parts 13 with different sizes and specifications to obtain different distraction heights according to the disease condition of a patient.
In the embodiment of the present invention, when the intervertebral fusion device needs to be implanted between two vertebral bodies, the sheet-shaped expansion portion 13 is horizontally positioned in the accommodating groove 14 of the sheet-shaped expansion portion 13 with a specific specification selected in advance. Then, the fusion cage body 10 is placed between the two vertebral bodies, the hinge shaft is positioned at one side close to the back side of the patient body, the opening side formed by the upper and lower supporting parts is positioned at one side close to the front side of the patient body, then the sheet-shaped opening part 13 is rotated from the horizontal state to the vertical state, and one side of the sheet-shaped opening part is inserted into the supporting groove 15, so that the sheet-shaped opening part 20 is fixed in the fusion cage body 10 in the vertical state, and the opening formed by the two supporting bodies 11 in a hinged state is opened, at this time, the fusion cage body 10 is in a trapezoidal body with small thickness at the back side and large thickness at the front side, so that the intervertebral space of the patient suffering from kyphosis can be restored to the normal height, and the lordosis is reconstructed, and the effect of correcting the kyphosis. In addition, because the intervertebral fusion cage provided by the embodiment of the invention realizes the orthodontic effect by adopting the mode of firstly implanting between two vertebral bodies and then expanding between the two vertebral bodies, in the process of expanding the fusion cage main body 10 by rotating the flaky expanding part 13, the stress is mainly concentrated between the fusion cage main body 10 and the flaky expanding part 13 instead of between the fusion cage main body 10 and the vertebral bodies, so the risk of damaging the end plates of the vertebral bodies is greatly reduced.
Fig. 2 is a schematic structural view of a body 10 of an intervertebral cage according to an embodiment of the present invention, in which receiving grooves 14 are provided only on a lower surface of an upper support 12. As shown in fig. 2, according to an embodiment of the present invention, the receiving grooves 14 are only provided on the lower surface of the upper support portion 12, and the receiving grooves are not provided on the upper surface of the lower support portion 11.
Fig. 3 is a schematic structural view of a body 10 of an intervertebral cage according to an embodiment of the present invention, in which a receiving groove is formed only on an upper surface of a lower support 11. As shown in fig. 3, according to an embodiment of the present invention, the receiving grooves 14 are only disposed on the upper surface of the lower support portion 11, and the receiving grooves are not disposed on the lower surface of the upper support portion 12.
Fig. 4 is a schematic structural view of a main body of an intervertebral fusion cage according to an embodiment of the invention, wherein a receiving groove is formed on both the lower surface of the upper support 12 and the upper surface of the lower support 11. As shown in fig. 4, according to an embodiment of the present invention, the lower surface of the upper support part 12 and the upper surface of the lower support part 11 are provided with receiving grooves.
Fig. 5 to 7 are side views of the body of the intersomatic cage according to various embodiments of the present invention, in which the upper support part 12, the lower support part 11, the receiving groove 14, and the support groove 15 are shown. As shown in fig. 5, the receiving groove 14 is formed on the upper surface of the lower supporting portion 11, wherein the supporting groove 15 is located in the receiving groove 14 and is located at a side of the receiving groove away from the hinge shaft, and the supporting groove 15 and the receiving groove 14 share an inner sidewall 151. As shown in fig. 6, the receiving groove 14 is formed on the upper surface of the lower supporting portion 11, wherein the supporting groove 15 is located in the receiving groove 14 and at the middle position of the receiving groove 14. As shown in fig. 6, the receiving groove 14 is formed on the upper surface of the lower supporting portion 11, wherein the supporting groove 15 is located outside the receiving groove 14 and separated from the receiving groove 14. Regarding the relationship between the receiving groove 14 and the supporting groove 15, fig. 5 to 7 are only schematic, and the present invention is not limited thereto.
Fig. 8 is a side view of a body of an intervertebral cage according to an embodiment of the invention, in which the upper surface of the lower support part is provided with a plurality of support grooves. As shown in fig. 8, in an embodiment of the present invention, a plurality of support grooves, such as a support groove 152 and a support groove 153, may be opened on the upper surface of the lower support part 11 to allow different expansion angles of the upper support part 12 and the lower support part 11 to be achieved by the sheet-shaped expanding part 13 of the same specification.
As shown in fig. 1, in one embodiment of the present invention, the lower surface of the upper support 12 is provided with a limit step 121, and when the fusion cage body 10 is in the expanded state, the upper side edge of the sheet-like expanded portion 13 abuts against the limit step 151, thereby preventing the sheet-like expanded portion from sliding along the lower surface of the upper support 12.
Fig. 9 is a side view of the main body of the intervertebral fusion device according to an embodiment of the invention, wherein the limiting step and the receiving groove share an inner sidewall. As shown in fig. 10, in an embodiment of the present invention, the receiving groove 14 is formed on the lower surface of the upper supporting portion 12, and the limiting step 121 and the receiving groove 14 share an inner sidewall 122.
Fig. 10 is a schematic view showing the overall structure of an intervertebral cage according to an embodiment of the present invention, in which a barrier 17 is provided at one side of a spacer 13 in a sheet. As shown in fig. 10, in one embodiment of the present invention, two baffles 17 are provided at one end of the sheet-like expansion portion 13, and one or more mounting holes 171 are provided in the baffles 17 for fixing the sheet-like expansion portion to the inferior vertebral body or the superior vertebral body through the mounting holes 171. Although fig. 10 shows that one side of the expanding portion 13 has two flaps, the present invention is not limited to this, and only one flap 17 may be provided. For example, one flap is provided only on the upper side of one end of the sheet-like expanding portion, or one flap is provided only on the upper side of one end of the sheet-like expanding portion.
In one embodiment of the present invention, only one larger mounting hole 172 may be provided in the shield 17, so that a screw of 40 mm length and 6 mm diameter may be used to screw into the vertebral body for immediate stability of the intervertebral cage. For example, when there are two baffles, each baffle 17 may be provided with only one larger mounting hole 172, or one baffle 17 may be provided with one larger mounting hole 172 and the other baffle may be provided with a plurality of smaller mounting holes 171. Of course, a plurality of mounting holes 171 may be provided in both of the baffles. The invention is not limited thereto.
In one embodiment of the invention, the sheet-like expansile is provided with a plurality of micropores. The micropores can be uniformly distributed or non-uniformly distributed; the shape of the micro-pores may be circular, elliptical, polygonal, etc.
In one embodiment of the present invention, the plurality of minute holes provided on the sheet-like spreading portion are circular holes having a diameter of 230 to 280 micrometers, particularly 250 micrometers.
In one embodiment of the invention, the plate-like struts are coated with a titanium bead coating to better achieve bone ingrowth and long term stability.
In one embodiment of the present invention, the sheet-like expanding portion has a length equal to that of the upper support portion and the lower support portion.
According to the interbody fusion cage, the height of one side of the interbody fusion cage is easy to realize to be larger, and the height of the other side of the interbody fusion cage is easy to realize to correct the kyphosis of a patient. According to the interbody fusion cage, the distraction operation of the fusion cage can be realized from the side surface of the fusion cage, so that the interbody fusion cage can be suitable for the interbody fusion operation of lumbar vertebra side front approach. According to the interbody fusion cage, the orthodontic effect is realized by adopting the mode of firstly implanting between two vertebral bodies and then expanding between the two vertebral bodies, and in the process of expanding the upper and lower supporting parts through the rotating sheet-shaped expanding part, the stress is mainly concentrated between the upper and lower supporting parts and the sheet-shaped expanding part instead of between the upper and lower supporting parts and the vertebral bodies, so that the risk of damaging the vertebral end plates is greatly reduced. The interbody fusion cage has simple structure and convenient operation, not only saves the manufacturing cost of the interbody fusion cage, but also can greatly shorten the operation time.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, it is intended that the present invention also encompass such modifications and variations.
Claims (9)
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| CN201910830299.6A CN110464516B (en) | 2019-09-04 | 2019-09-04 | an intervertebral fusion device |
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| CN110786976B (en) * | 2019-12-02 | 2022-03-11 | 深圳福能医疗科技有限公司 | Orthopedic spring for enlarging preputial orifice of penis |
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