KR101531171B1 - Intervertebral prosthesis - Google Patents

Abstract

The present invention relates to an intervertebral prosthesis, as a cage type intervertebral prothesis, having a significantly improved intervertebral fixation power, specifically, to an intervertebral prosthesis comprising: a cage main body inserted between an upper spine and a lower spine; at least one or more fixing members which fix the cage main body in at least one or more spines between the upper spine and the lower spine; a connecting member combined with a rear end portion of the cage main body, and connecting the cage main body and the fixing members; and a separation preventing portion which prevents the fixing members from being separated from the connecting member when the cage main body is fixed in at least one or more spines by the fixing members.

Description

[0001] INTERVERTEBRAL PROSTHESIS [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an intervertebral prosthesis, and more particularly, to a cage-type intervertebral prosthesis which has remarkably improved fixation force between vertebrae.

The vertebrae are the bone structures that form the spinal column. In the newborns of the birth, there are 33 cervical spine, 12 spine, 5 spine, 5 spine, It is made up of 4 pieces. In adults, 5 pieces of sacrum (sacrum) and 4 pieces of tail bone (sacrum) are combined into one, forming sacrum and sacrum and 26 pieces.

An intervertebral disc is interposed between the vertebrae and the vertebrae.

On the other hand, if the vertebrae are structurally problematic due to problems such as congenital, degenerative or accidental problems such as a stable arrangement or a narrow space between vertebrae, . In this case, one of the spinal fixation techniques used is interbody spinal cage implantation, and the patient is usually placed in a prone position to incise the skin and muscles, to expose the vertebra bone, to remove the intervertebral disc, And a cage is inserted between the root and the nerve root.

The cage according to the related art is configured to be inserted between the vertebral body and the vertebral body and to be fused (united) after replacing the original intervertebral disc after removing the vertebral disc between the vertebral body and the vertebral body. Specifically, the cage according to the related art includes a cage body inserted and fused between the vertebrae, and a fixing screw for digging the inside of the vertebral body and fixing the cage body to the vertebral body.

However, the cage according to the related art has a disadvantage that the fixation force to the vertebral body is not high because the cage is kept fixed only by the coupling force between the vertebra and the fixation screw. In addition, since no fixing means is provided between the cage body and the fixing screw, if the coupling force between the vertebral body and the fixing screw is loosened due to abrasion of the vertebral body due to the operation of the operation patient after the cage insertion is completed, There has been a risk of being detached from the cage body.

Accordingly, an object of the present invention is to solve the problems of the prior art.

Specifically, it is an object of the present invention to provide an intervertebral prosthesis having improved fixation force to a vertebral body.

Still another object of the present invention is to provide a vertebral prosthesis which can improve the osseointegration force between the vertebral body and the cage body and reduce the time required for union, even after the operation of the cage is completed, .

According to an embodiment of the present invention, there is provided a cage comprising: a cage body inserted between an upper vertebra and a lower vertebra; At least one fixing member for fixing the cage body to at least one of the upper vertebrae and the lower vertebrae; A connecting member coupled to the rear end of the cage body and connecting the cage body and the fixing member; And an anti-deviation portion for preventing the fixing member from being detached from the connecting member when the cage body is fixed to the at least one or more vertebrae by the fixing member.

Preferably, the fixing member includes a body portion having a fixing thread on an outer circumferential surface thereof, which is fixed by digging the inside of the at least one spine, and an outer diameter larger than the outer diameter of the body portion, And the connecting member includes a fastening through hole configured to pass through the body portion and to catch the head portion.

Preferably, the release preventing portion includes a first screw thread formed on the outer circumferential surface of the head portion, and a second screw thread formed on the inner surface of the fastening through hole so as to fasten the first screw thread.

Preferably, the head portion has a tapered shape in the rear end portion of the fixing member in the direction of the front end of the fixing member, and the fastening through-hole has a tapered shape corresponding to the tapered shape of the head portion. Shape.

Preferably, the fastening through-hole includes an insertion guide portion for guiding the body portion to be inserted into the at least one spine at a predetermined inclination angle with respect to the upper surface or the lower surface of the cage body.

Preferably, the insertion guide portion is provided at a front end portion of the fastening through-hole and includes a guide thread corresponding to the fastening thread.

Preferably, recessed recessed grooves are provided on the upper surface and the lower surface of the rear end portion of the cage body in the same direction as the at least one or more vertebrae.

Preferably, the connecting member is coupled to the cage body so as to be rotatable with respect to the cage body by a predetermined angle.

Preferably, the cage body includes a joint material receiving portion that is vertically penetrated so as to fill the joint material, and a reinforcing rib that connects both inner sides of the cage body so as to transverse the joint material receiving portion .

According to the above-mentioned problem solving means, the present invention significantly improves the fixing force between the fixing member and the connecting member by including the separation preventing portion, whereby the fixing member is fixed within the vertebral body and simultaneously fixed by the connecting member, that is, The fixation force of the interbody fusion prosthesis to the vertebral body can be remarkably improved.

In addition, since the present invention includes the insertion guide portion, it is not necessary to take extra effort and time to adjust the insertion angle of the fixing member, so that even if the user is unskilled about cage insertion, the fixing member is accurately fixed to the cage body at an angle with respect to the cage body As a result, the ease of operation of the cage implantation can be improved and at the same time the operation time can be reduced.

Further, since the connecting member is provided so as to be rotatable with respect to the cage body by a predetermined angle, even if the operation patient performs the same activity as usual after the cage insertion is completed, only the connecting member rotates at a predetermined angle with respect to the cage body, Since the upper union surface and the lower union surface of the main body can maintain the contact state with the vertebrae, it is possible to improve the bone union force between the vertebral body and the main body of the cage and to reduce the time required for union.

1 is a schematic perspective view of an intervertebral prosthesis according to an embodiment of the present invention.
2 is a schematic rear view of a vertebral prosthesis according to an embodiment of the present invention.
3 is a schematic side view of an intervertebral prosthesis according to an embodiment of the present invention.
4 is a schematic exploded perspective view of an intervertebral prosthesis according to an embodiment of the present invention.
5 is a schematic enlarged perspective view of a fixing member and a connecting member according to an embodiment of the present invention.
6 is a schematic longitudinal sectional view of a fixing member and a connecting member according to an embodiment of the present invention.
FIG. 7 is a schematic side view of a vertebral implant inserted between vertebrae according to an embodiment of the present invention. FIG.
8 is a schematic side view of a rotation angle of a connecting member according to an embodiment of the present invention.
9 is a schematic perspective view of an intervertebral prosthesis according to another embodiment of the present invention.
10 is a schematic plan view of an intervertebral prosthesis according to another embodiment of the present invention.
11 is a schematic exploded perspective view of an intervertebral prosthesis according to another embodiment of the present invention.
12 is a schematic longitudinal sectional view of a vertebral prosthesis according to another embodiment of the present invention.
13 is a schematic longitudinal sectional view of an intervertebral prosthesis, a drill guide member and a drill member according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It should be noted that the drawings denoted by the same reference numerals in the drawings denote the same reference numerals whenever possible, in other drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. And certain features shown in the drawings are to be enlarged or reduced or simplified for ease of explanation, and the drawings and their components are not necessarily drawn to scale. However, those skilled in the art will readily understand these details.

FIG. 1 is a schematic perspective view of an intervertebral prosthesis 1000 according to an embodiment of the present invention, and FIG. 2 is a schematic rear view of an intervertebral prosthesis 1000 according to an embodiment of the present invention FIG. 3 is a schematic side view of a vertebra prosthesis 1000 according to an embodiment of the present invention, and FIG. 4 is a schematic exploded perspective view of an intervertebral prosthesis 1000 according to an embodiment of the present invention. FIG. 5 is a schematic enlarged perspective view of a fixing member 200 and a connecting member 300 according to an embodiment of the present invention. FIG. 6 is a perspective view illustrating a fixing member 200 and a fixing member 300 according to an embodiment of the present invention. 7 is a schematic side view of the intervertebral prosthesis 1000 according to an embodiment of the present invention in an intervertebral insertion state, and FIG. 8 is a cross- The schematic diagram of the rotation angle of the connecting member 300 according to the embodiment Side view.

1 to 8, an intervertebral prosthesis 1000 according to an embodiment of the present invention includes a cage body 100, at least one fixing member 200, a connecting member 300, And a departure prevention portion.

1 to 4, 6 and 7, the cage body 100 is inserted between an upper vertebra (body) and a lower vertebra (body), and a distance between the upper vertebra and the lower vertebra At a predetermined interval.

The cage body 100 is bone fusion between the upper vertebrae and the lower vertebrae after the completion of the cage insertion, and is fixed between the upper vertebrae and the lower vertebrae.

The cage body 100 may be made of a biocompatible material and preferably made of a resin material having properties similar to those of natural bone such as PEEK (polyetheretherketone), PEAK, and PAEK, which are biocompatible polymers .

However, the present invention is not limited thereto, and thus the cage body 100 according to the present invention may be made of a biocompatible metal such as titanium.

The cage body 100 has a rectangular prism shape extending in the anteroposterior direction as a whole. The cage body 100 is in contact with the lower surface of the upper vertebra and is in contact with the upper fusion surface 101 and the upper surface of the lower vertebra, A front end portion 105 positioned in the front direction, a rear end portion 107 positioned in the rear direction, and a lower end portion 103 positioned above and below the upper fusing surface 101 and the lower fusing surface 103, And a bone graft material receiving unit 120 formed to penetrate the bone graft material (or the bone formation promoting material).

The cage body 100 is inserted into the upper fuselage surface 101 and / or the lower fusing surface 103 at a predetermined depth on the lower surface of the upper vertebra and / or the upper surface of the lower vertebra, And a plurality of fixing protrusions 110 for fixing between the lower vertebrae. The plurality of fixing protrusions 110 stably maintain the position of the cage body 100 at an initial stage of the cage insertion.

The plurality of fixing protrusions 110 are closely arranged closely to each other, and preferably have a triangular pyramid shape. However, the shape of the fixing protrusion 110 is illustrative, and the present invention is not limited thereto.

The front end portion 105 has a tapered shape in which the thickness becomes smaller toward the front in the rear direction. Therefore, when the cage body 100 is inserted between the vertebrae, the inserting process of the cage body 100 can be facilitated.

The rear end portion 107 is provided with a coupling groove 130 in which a coupling extension portion 340 of a coupling member 300, which will be described later, is inserted or received. In this embodiment, a total of two coupling grooves 130 are formed on both sides of the rear end portion, one for each. Of course, a total of two coupling extension portions 340 are formed on both sides of the coupling groove 130 to be described later.

An upper pin hole 141 and a lower pin hole 143 are formed in the upper and lower portions of the coupling groove 130 at the rear end portion 107 of the cage body 100. The upper pinhole 141 and the lower pinhole 143 are arranged in a straight line on the upper and lower sides and are connected to the coupling groove 130. An engaging pin 360 is inserted and / or fixed to each of the upper pin hole 141 and the lower pin hole 143.

At this time, the coupling pin 360 may be coupled to the upper pin hole 141 and the lower pin hole 143 in an interference fit manner and / or a shape fit fit. The coupling pin 360 passes through the pinhole 341 of the coupling extension portion 340 of the coupling member 300 which will be described later and aligned with the upper pinhole 141 and the lower pinhole 143, Thus, the connecting member 300, which will be described later, is coupled to the cage body 100.

The bone unification material receiving portion 120 is formed to pass through the cage body 100 so as to form a space filled with the bone fusion material.

The inner side surfaces of the cage body 100 defining the jointing material receiving portion 120 may be transversely transverse to the inner side surfaces of the cage body 100, And at least one reinforcing rib 121 for connecting the reinforcing ribs 121 to each other. As a result, the strength of the cage body 100 reduced by the joint material receiving portion 120 can be reinforced.

The surface of the rear end of the cage body 100 in the same direction as the at least one of the upper surface (i.e., the upper fused surface 101) and the lower surface (i.e., the lower fused surface 103) (The upper escape groove 151 or the lower escape groove 153) are provided. The escape groove is formed at an inclination angle that is the same as or similar to the inclination angle of the fixing member 200 to be described later with respect to the cage body 100. Therefore, it is possible to eliminate the spatial interference between the cage body 100 and the fixing member 200, which will be described later, which is coupled to the upper and lower surfaces of the cage body 100 by a predetermined angle.

As shown in FIGS. 1 to 6, the fixing member 200 is configured to fix the cage body 100 to at least one of the upper vertebrae and the lower vertebrae, and at least one of them is provided. One of the two fixing members 200 is fixed to the upper vertebra by digging the inside of the upper vertebra, and the fixing member 200 is fixed to the upper vertebra, The other fixing member 200 of the two fixing members 200 is inserted into the lower vertebra and fixed to the lower vertebra.

The fixing member 200 includes a body part 210 provided in a forward direction and a head part 230 extending in a rear direction from the body part 210, .

The body 210 has a fixing thread 213 on the outer circumferential surface thereof and a sharp end 211 at a front end thereof.

The head part 230 is extended from the rear end of the body part 210 to be engaged with the fastening through holes 321 and 331 of the connecting member 300 to be described later, The outer diameter of which is larger than the outer diameter of the outer circumference. The head portion 230 has a tapered shape in which the diameter gradually decreases toward the front end of the fixing member 200 at the rear end of the fixing member 200. Of course, the fastening through-holes 321 and 331 of the connecting member 300, which will be described later, also have a tapered shape corresponding to the shape of the head portion 230.

In addition, a first screw thread 231 is provided on the outer circumferential surface of the head portion 230. The first thread 231 is correspondingly fastened to the second threads 323 and 333 of the fastening through holes 321 and 331 of the connecting member 300 to be described later, (333). The separation preventing portion prevents the fixing member 200 from being detached from the connecting member 300 when the cage body 100 is fixed to the at least one or more vertebrae by the fixing member 200. [

A second tool engagement groove 233 is formed on a rear surface of the head unit 230 to fasten a driver tool for rotating the fixation member 200 so that the fixation member 200 can be fixed in the vertebrae do.

Preferably, the fixing member 200 may be made of a biocompatible material having mechanical strength and hardness greater than that of the cage body 100 and the connecting member 300. For example, the fixation member 200 may be constructed of a biocompatible metal.

The fixing member 200 is connected to the upper fusing surface 101 and / or the lower fusing surface 103 of the cage body 100 in the forward direction toward the adjacent vertebrae when connected or coupled to the connecting member 300 As shown in Fig.

1 to 6, the connecting member 300 is coupled to the rear end of the cage body 100 and is configured to connect the cage body 100 with a later-described fixing member 200 .

The connecting member 300 connects the cage body 100 and a fixing member 200 to be described later to fix at least one fixing member 200 fixed to at least one of the upper and lower vertebrae To the cage body (100).

The connection member 300 is made of a biocompatible material like the cage body 100 and is made of a biocompatible polymer (for example, PEEK or the like) or a biocompatible metal (for example, titanium or the like) do.

Preferably, the connecting member 300 may be made of a biocompatible material having greater mechanical strength and / or hardness than the cage body 100.

For example, the cage body 100 may be constructed from a biocompatible polymer, and the connecting member 300 may be constructed from a biocompatible metal. Therefore, the cage body 100, which receives the load between the actual vertebrae, can have a predetermined elastic restoring force, so that it acts as a buffer against the pressure or load between the vertebrae, and at the same time, It is possible to prevent abrasion or necrosis of the vertebral body in contact with the bone fusion surface. In addition, when the fixing member 200 made of a material having a high mechanical strength and hardness is directly bonded to the cage body 100 composed of a biocompatible polymer having a relatively weak mechanical property, the cage body 100 It is possible to prevent the cage body 100 from being damaged by constructing the connecting member 300 with a material having a high mechanical strength.

4 to 6, the connecting member 300 according to the present embodiment includes a main body 310 positioned parallel to the rear surface of the rear end of the cage body 100, An upper extension portion 320 and a lower extension portion 330 extending upward and downward of the main body 310 and two coupling extension portions 330 extending from both sides of the intermediate portion of the main body 310 340).

The main body 310 includes a first tool engagement groove 350 (see FIG. 3) that penetrates the main body 310 in a thickness direction (i.e., forward and backward direction) or is formed at a predetermined depth in a forward direction on a rear surface of the main body 310 ). The first tool engagement groove 350 has a polygonal shape or a circular shape and is configured to be detachably coupled to the cage body 100 to be coupled with an insertion tool for inserting the cage body 100 between the vertebrae.

The upper extension part 320 and / or the lower extension part 330 are vertically aligned with each other on the right and left vertical bisector of the main body part 310. When the cage insertion operation is performed, The upper extension 320 and the lower extension 330 are disposed in close contact with the side surfaces of the upper vertebra and the lower vertebra so that the upper and lower vertebrae And is fixed to the side surface.

 The upper extension part 320 and / or the lower extension part 330 may be formed in a shape of a through hole (not shown) formed through the upper extension part 320 and / or the lower extension part 330, 321) < / RTI >

The fastening through holes 321 and 331 pass through the body portion 210 of the fastening member 200 and the head portion 230 of the fastening member 200 passes through the fastening through holes 321 331, respectively. The connecting through holes 321 and 331 have a tapered shape and the minimum diameter of the connecting through holes 321 and 331 is smaller than the minimum diameter of the body portion 210 of the fixing member 200 And may be less than the maximum outer diameter of the head portion 230 of the fixing member 200. [

333 formed on the inner surface of the fastening through holes 321 and 331 so as to be fastened to the first screw thread 231 provided on the head portion 230 of the fastening member 200, . The second screw threads 323 and 333 together with the first thread 231 form a separation preventing portion which prevents the cage body 100 from being pinched by the fixing member 200, So that the fixing member 200 is prevented from being detached from the connecting member 300.

The connecting through-holes 321 and 331 are formed such that the inlet formed on the rear surface of the connecting member 300 and the outlet formed on the front surface of the connecting member 300 are inclined at a predetermined angle. This is so that the fixing member 200 is fixed to the vertebrae at a predetermined angle with respect to the cage body 100 as described above.

The fastening through holes 321 and 331 may be formed in a manner such that the body 210 of the fastening member 200 is engaged with the upper surface of the cage body 100 And an insertion guide portion for guiding insertion into the upper vertebrae, or the lower vertebrae, or the upper vertebrae and the lower vertebrae at predetermined inclination angles with respect to the lower fusion surface (lower fusion surface 103).

Although not shown in the drawing, the insertion guide portion is formed to correspond to the fixing thread 213 provided on the body portion 210 of the fixing member 200, . At this time, it is preferable that the guide thread is provided at the front end of the fastening through holes 321, 331 of the connecting member 300, and the second threads 323, 333 forming the above- Is preferably provided at the rear end of the fastening through holes (321, 331) of the connecting member (300). That is, the fastening through holes 321 and 331 include the guide threads at the front end and the second threads 323 and 333 at the rear end.

However, this is merely an example, and the insertion guide portion according to the present invention is not limited thereto.

Therefore, it is not necessary for the present invention to take extra time and time to adjust the insertion angle of the fixing member 200 due to the insertion guide portion, so that even if the user is unskilled about cage insertion, It is possible to fix the cage to the vertebra accurately at a constant angle, and as a result, the ease of operation of the cage insertion can be improved and the time required for the operation can be reduced.

The coupling extension 340 extends in the forward direction on both sides of the upper and lower middle portions of the main body 310.

Each of the coupling extensions 340 is provided with a pinhole 341 passing through the coupling extension 340 in the thickness direction (i.e., up and down direction) And an engaging pin 360 inserted and fixed to the upper pin hole 141 and the lower pin hole 143.

6 and 8, the connecting member 300 may be coupled to the cage body 100 so as to be rotatable with respect to the cage body 100 by a predetermined angle. When the coupling member 300 is coupled to the cage body 100, a space is formed between the front end of the coupling extension 340 and the end of the coupling groove 130 of the cage body 100, a predetermined gap g2 is formed between the front surface of the coupling member 300 and the rear surface of the cage main body 100 and the coupling groove 130 and the coupling extension 340 Should be configured such that the thickness t2 of the coupling groove 130 is greater than the thickness of the coupling extension 340 (t1). The diameter d2 of the pinhole 341 of the coupling extension 340 should also be greater than the outer diameter d1 of the coupling pin 360 for smooth and angular rotation of the coupling member 300. Therefore, even if the operation member performs the same operation as usual after the cage insertion operation is completed, only the connecting member 300 is rotated with respect to the cage body 100 by a predetermined angle, Since the lower fusion surface 103 can maintain the contact state with the vertebral body, it is possible to improve the osteoimplantation force between the vertebral body and the cage body 100 and to reduce the time required for bone union.

FIG. 9 is a schematic perspective view of an intervertebral prosthesis 1000 according to another embodiment of the present invention, and FIG. 10 is a schematic plan view of an intervertebral prosthesis 1000 according to another embodiment of the present invention. 11 is a schematic exploded perspective view of an intervertebral prosthesis 1000 according to another embodiment of the present invention, and FIG. 12 is a perspective view of an intervertebral prosthesis 1000 according to another embodiment of the present invention. 1 is a schematic longitudinal sectional view.

The intervertebral prosthesis 1000 according to another embodiment of the present invention shown in Figs. 9 to 12 is similar to the intervertebral prosthesis 1000 according to the embodiment of the present invention shown in Figs. 1 to 8 And the structure of the connecting member 300 is different. Hereinafter, in order to avoid duplication of the description, the difference between the two embodiments will be described as much as possible.

9 to 12, the connecting member 300 according to the present embodiment includes a main body 310 positioned parallel to the rear surface of the rear end of the cage body 100, And a coupling extension 340 extending in a forward direction from a central portion of the coupling portion 310. Correspondingly, the coupling groove 130 of the cage body 100 according to the present embodiment is also formed at the central portion of the rear end of the cage body 100. [

The main body 310 includes first tool engagement grooves 350 formed on both sides of the main body 310. The first tool engagement groove 350 is detachably coupled to the cage body 100 and is configured to engage with an insertion tool for inserting the cage body 100 between the vertebrae.

In the connecting member 300 according to the present embodiment, the fastening through holes 321 and 331 are not formed in the upper and lower extension parts 320 and 330, And is formed in a forward direction inclined at a predetermined angle from the upper and lower middle portions of the rear surface.

The fastening through holes 321 and 331 pass through the body portion 210 of the fastening member 200 and the head portion 230 of the fastening member 200 passes through the fastening through holes 321 331, respectively. The connecting through holes 321 and 331 have a tapered shape and the minimum diameter of the connecting through holes 321 and 331 is smaller than the minimum diameter of the body portion 210 of the fixing member 200 And may be less than the maximum outer diameter of the head portion 230 of the fixing member 200. [

333 formed on the inner surface of the fastening through holes 321 and 331 so as to be fastened to the first screw thread 231 provided on the head portion 230 of the fastening member 200, . The second screw threads 323 and 333 together with the first thread 231 form a separation preventing portion which prevents the cage body 100 from being pinched by the fixing member 200, So that the fixing member 200 is prevented from being detached from the connecting member 300.

The connecting through-holes 321 and 331 are formed such that the inlet formed on the rear surface of the connecting member 300 and the outlet formed on the front surface of the connecting member 300 are inclined at a predetermined angle. The inlet of the fastening through holes 321 and 331 is formed in the upper and lower middle portions of the rear surface of the body portion 310 and the outlet of the fastening through holes 321 and 331 is formed in the main body portion 310 are inclined upward or biased downward. This is so that the fixing member 200 is fixed to the vertebrae at a predetermined angle with respect to the cage body 100 as described above.

The fastening through holes 321 and 331 may be formed in a manner such that the body 210 of the fastening member 200 is engaged with the upper surface of the cage body 100 And an insertion guide portion for guiding insertion into the upper vertebrae, or the lower vertebrae, or the upper vertebrae and the lower vertebrae at predetermined inclination angles with respect to the lower fusion surface (lower fusion surface 103).

Although not shown in the drawing, the insertion guide portion is formed to correspond to the fixing thread 213 provided on the body portion 210 of the fixing member 200, . At this time, it is preferable that the guide thread is provided at the front end of the fastening through holes 321, 331 of the connecting member 300, and the second threads 323, 333 forming the above- Is preferably provided at the rear end of the fastening through holes (321, 331) of the connecting member (300). That is, the fastening through holes 321 and 331 include the guide threads at the front end and the second threads 323 and 333 at the rear end.

However, this is merely an example, and the insertion guide portion according to the present invention is not limited thereto.

Therefore, it is not necessary for the present invention to take extra time and time to adjust the insertion angle of the fixing member 200 due to the insertion guide portion, so that even if the user is unskilled about cage insertion, It is possible to fix the cage to the vertebra accurately at a constant angle, and as a result, the ease of operation of the cage insertion can be improved and the time required for the operation can be reduced.

It is preferable that additional fixing protrusions 371 and 373 of the same or similar shape and size as the fixing protrusions 110 of the cage body 100 are provided on the upper and lower portions of the main body 310 have.

According to the present embodiment, unlike the intervertebral prosthesis 1000 according to the embodiment of the present invention shown in FIGS. 1 to 8, when the cage insertion operation is performed, both the cage body 100 and the connecting member 300 are not in contact with the upper vertebra And the lower vertebra and is fixed between the upper vertebra and the lower vertebra.

13 is a schematic longitudinal sectional view of a vertebra prosthesis, a drill guide member 400, and a drill member 500 according to the present invention.

13, the drill guide member 400 is fastened to the second threads 323 and 333 provided in the fastening through holes 321 and 331 of the connecting member 300 so that the insertion guide portion And the drill member 500 can be preliminarily drilled in the upper vertebrae or the lower vertebrae through the interior of the drill guide member 400. Here, in the present embodiment, no guide threads are provided in the fastening through-holes 321 and 331, and only the second threads 323 and 333 are formed along the entire longitudinal direction of the fastening through- .

More specifically, the drill guide member 400 includes a body 401, a drill receiving portion 403 formed in the body 401 to penetrate the body 401 in the longitudinal direction, And includes a front end with a third thread 405 that is fastened (i.e., corresponding). The front end portion has a shape tapered in a forward direction corresponding to the fastening through-hole.

The drill member 50 includes a main body 501 extending through the drill receiving portion 403 and a drill head portion 503 provided at a front end portion of the main body 501 and rotating to pierce the vertebrae ). At this time, the maximum outer diameter of the drill member is preferably equal to or less than the inner diameter of the drill receiving portion.

(I.e., the third screw thread) of the drill guide member is inserted into the fastening through-hole (i.e., the second screw thread) of the connecting member, . Thereafter, a preliminary drilling operation is performed on the vertebra at a position where the drill member is pierced into the drill eve member and then rotated and fixed. Thereafter, the drill member is pulled out from the drill guide member and the drill guide member is detached from the linking member, and then the fixation member is fixed to the preliminarily drilled position while being coupled to the linking member.

In this way, preliminary perforation can be performed on the vertebrae, which is the fixed position, by the second screw thread, the drill guide member, and the drill member, so that the insertion guide portion can be formed when the fixation member is fixed to the vertebra, It is possible to secure the fixing member 200 accurately to the vertebra at an angle with respect to the cage body 100 even if an unskilled person is inflicted with the cage insertion technique. It is possible to improve the ease of operation and reduce the time required for surgery.

13 shows only a second thread, a drill guide member and a drill member applied to an intervertebral prosthesis according to another embodiment of the present invention shown in Figs. 9 to 12, but the present invention is not limited thereto The present invention can be applied to an intervertebral prosthesis according to an embodiment of the present invention shown in FIGS. 1 to 8.

According to the foregoing, the present invention significantly improves the fixing force between the fixing member and the connecting member by including the separation preventing portion, whereby the fixing member is fixed within the vertebral body and simultaneously fixed by the connecting member, that is, The fixation force of the intervertebral prosthesis to the vertebral body can be remarkably improved.

In addition, since the present invention includes the insertion guide portion, it is not necessary to take extra effort and time to adjust the insertion angle of the fixing member, so that even if the user is unskilled about cage insertion, the fixing member is accurately fixed to the cage body at an angle with respect to the cage body As a result, the ease of operation of the cage implantation can be improved and at the same time the operation time can be reduced.

Further, since the connecting member is provided so as to be rotatable with respect to the cage body by a predetermined angle, even if the operation patient performs the same activity as usual after the cage insertion is completed, only the connecting member rotates at a predetermined angle with respect to the cage body, Since the upper union surface and the lower union surface of the main body can maintain the contact state with the vertebrae, it is possible to improve the bone union force between the vertebral body and the main body of the cage and to reduce the time required for union.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, . ≪ / RTI > Accordingly, such modifications are deemed to be within the scope of the present invention, and the scope of the present invention should be determined by the following claims.

1000: vertebral prosthesis
100: cage body
200: Fixing member
300: connecting member

Claims (9)

A cage body inserted between the upper vertebra and the lower vertebra;
At least one fixing member for fixing the cage body to at least one of the upper vertebrae and the lower vertebrae;
An upper extension portion and a lower extension portion extending in the upper and lower directions of the main body portion, and a lower extension portion extending in a forward direction from an intermediate portion of the main body portion, A connecting member coupled to the rear end of the cage body so as to be rotatable by a predetermined angle with respect to the cage body, the connecting member connecting the cage body and the fixing member;
And a separation preventing portion for preventing the fixing member from being detached from the connecting member when the cage body is fixed to the at least one or more vertebrae by the fixing member,
An upper pinhole and a lower pinhole formed in the upper and lower portions of the coupling groove so as to communicate with the coupling groove and a lower pinhole formed in the upper pinhole and the coupling extension, A pinhole and an engaging pin inserted and fixed to the lower pinhole,
The connection member is formed in the cage main body so that a predetermined gap is formed between the front end portion of the coupling extension portion and the end portion of the coupling groove and a predetermined gap is formed between the front surface of the main body portion of the coupling member and the rear surface of the cage main body. Lt; / RTI &
Wherein the engaging groove and the engaging extension are configured such that the thickness of the engaging groove is greater than the thickness of the engaging extension,
Wherein a diameter of the pin hole of the coupling extension is larger than an outer diameter of the coupling pin. The method according to claim 1,
Wherein the fixing member includes a body portion having a fixing thread on an outer circumferential surface thereof and a head portion having an outer diameter larger than an outer diameter of the body portion, ,
Wherein the connecting member includes a fastening through hole configured to pass through the body portion and to receive the head portion. 3. The method of claim 2,
Wherein the separation preventing portion includes a first thread formed on an outer circumferential surface of the head portion and a second thread formed on an inner surface of the fastening through hole so that the first thread is fastened. The method of claim 3,
Wherein the head portion has a shape tapered from a rear end portion of the fixing member toward a front end portion of the fixing member,
Wherein the fastening through-hole has a tapered shape corresponding to a tapered shape of the head portion. 3. The method of claim 2,
Wherein the fastening through-hole includes an insertion guide portion for guiding the body portion to be inserted into the at least one spine at a predetermined inclination angle with respect to the upper surface or the lower surface of the cage body. 6. The method of claim 5,
Wherein the insertion guide portion is provided at a front end of the fastening through-hole and includes a guide thread corresponding to the fastening thread. The method according to claim 5 or 6,
Wherein a concave escape groove is provided in the upper surface and the lower surface of the rear end portion of the cage body in the same direction as the at least one or more vertebrae. delete The method according to claim 1,
Characterized in that the cage body includes a joint material receiving portion which is vertically penetrated so as to fill the joint material and a reinforcing rib which connects both inner sides of the cage body so as to transverse the joint material receiving portion. Liver prosthesis.

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