KR100953930B1 - An expandable cage for spinal implants and a holder - Google Patents

Abstract

PURPOSE: An expandable cage for a spinal implant and a cage holder are provided to increase bonding intensity between a spine and the cage by increasing a contact area between the spine and the cage. CONSTITUTION: A supporter(100) has a C shape. A penetration hole is formed on one side of the supporter. A taper is formed on the other side of the supporter. A plurality of first wedges is formed on the surface of the taper with a constant space. An opening is formed on the other side of the supporter. A moving body(120) has a trapezoidal shape and is inserted into the opening of the supporter. A plurality of second wedges(122) is formed on the upper side and the lower side of the moving body. A fixing groove is formed on both sides of the moving body.

Description

An expandable cage for spinal implants and a holder

The present invention relates to a cage and a cage holder for an expandable spinal implant, and more particularly, it is configured to be adjusted at an angle suitable for the body shape of the patient while being inserted between the vertebrae so that the spine can be fused in a stable form after surgery. It relates to a cage and a cage holder for an expandable spinal implant.

Joint and spinal diseases, which often appear in old age, are often caused by bone fractures, resulting in fractures. In addition, degenerative arthritis due to aging also appears in the hip joint and necrosis progresses or pain prevents walking or sitting. These joint and spinal diseases can also occur frequently in younger people. The most common cause of injury is trauma and often occurs incorrectly or innately.

As medical technology advances, the treatment of joint diseases is developing differently every day, and the most prominent treatment is artificial joint surgery that removes a part of the worn bone and inserts an artificial implant.

Currently, the operation method for disc surgery such as waist and neck includes a cage, which is a metal or plastic structure for removing problem discs between vertebral bones, maintaining disc heights in place, and supplying bones for fusion between vertebral bones. After the installation, the bones removed from the patient's pelvis, etc. are implanted into the structure to fuse the upper and lower spine.

Typically, the cage has a rectangular shape in which a cavity is formed to fill a bone generating material for fusion of a pair of vertebrae, and a cage holder for holding a cage when the cage is mounted on the vertebrae. Since part of is inserted into the cavity, it was troublesome to fill the cavity of the cage with bone formation material after mounting the cage between the vertebrae.

In addition, the 24 vertebrae that make up the spine are different in size and distance between the vertebrae, and the distances between the vertebrae vary depending on the patient's body shape. Cage should be used to fit the patient's body type, there is also a problem that can be separated between the vertebrae because only the load applied to the cage is fixed between the vertebrae.

In order to solve the above problems, the present invention is configured to be inserted between the vertebrae in a state in which the bone generating material is filled, and to be adjusted at an angle suitable for the body shape of the patient so that the spine after the operation can be fused in a stable form. It is an object of the present invention to provide a cage and a cage holder for an expandable spinal implant that can perform surgery more efficiently.

The expandable spinal implant cage according to the present invention, a through-hole is formed on one side of the body, the tapered in the form of narrowing toward the through-hole is formed on the other side of the body and a plurality of first at regular intervals on the surface of the taper 'C' shaped support having an opening having a wedge formed therein; And a second wedge formed on an upper surface and a lower surface to be inserted into the opening and engaged with the first wedge so as to move along the taper. It is configured to include, characterized in that the movable body moves along the taper inwardly of the support, characterized in that the support is configured to open in the upper and lower directions.

In addition, the cage holder according to the present invention, a cage holder for inserting the cage between the vertebrae consisting of a 'c' shaped support having an opening formed at one side, and a movable body inserted into the opening to adjust the height of the support. A bar-shaped shaft; A head portion connected to one end of the shaft; An inner tube is formed in a hollow cylindrical shape to insert the other end of the shaft inside the body, and the grip portion formed in two parts to grip the movable body in a form surrounding both sides of the cage for spinal implants on one side of the body. ; A hollow inner cylinder holder connected to the other side of the inner cylinder and penetrating the shaft therein; One side of the body with the shaft interposed therein is fixed to the head portion, and the other side of the body is connected to one side of the inner cylinder holder is connected, the guide portion formed in a hollow cylindrical shape with a male thread formed along the outer diameter of the body Wow; A through-hole is formed therein, a female thread is formed at an upper end of the through-hole so as to be engaged with the male thread, and a stepped portion is formed at the lower end of the through-hole so that one side of the inner cylinder holder can be inserted and restrained; And an outer cylinder made of a hollow cylindrical shape so as to insert an inner cylinder therein, and when the knob is rotated, the female screw thread and the male screw thread are engaged with each other to move upward or downward to move inside the through hole of the knob. It is characterized in that it is configured to adjust the height of the support by moving the inner cylinder holder bound to the movement direction of the knob.

Cage and cage holder for expandable spinal implant according to the present invention is inserted between the vertebrae with the bone formation material filled therein, so that after being inserted between the vertebrae can be adjusted at an angle suitable for the body shape of the patient It can be configured to perform the operation more efficiently, and the vertebrae can be fused in a stable form, while at the same time minimizing the possibility of deviation after insertion.

EMBODIMENT OF THE INVENTION Hereinafter, although the Example of this invention is described in detail, this invention is not limited to a following example, unless the summary is exceeded.

[Cage]

1 is an exploded perspective view showing the configuration of the expandable spinal implant cage according to an embodiment of the present invention, Figure 2 is a cross-sectional view showing the configuration of the expandable spinal implant cage according to an embodiment of the present invention, Figure 3 is a cross-sectional view showing an angle change of the cage for the expandable spinal implant according to an embodiment of the present invention.

Referring to Figure 1, the cage according to an embodiment of the present invention, the first through-hole 101 is formed on one side of the body and the taper of the narrower toward the through-hole side is formed on the other side of the body is constant on the surface of the taper It is inserted into the 'c' shaped support 100 and the opening 110 having a plurality of openings 110 formed with a plurality of first wedges 112 at intervals to be engaged with the first wedge 112 to move along the taper. The second wedge 122 is formed on the upper surface and the lower surface so as to include a trapezoidal movable body 120 formed with fixing grooves 124 of a predetermined depth for holding the cage holder 200 on both sides.

The support 100 may be formed using a material such as titanium, cobalt chromium alloy, PEEK, etc., and a cavity is formed therein so as to fill a bone generating material.

The first through hole 101 formed at one side of the support 100 is coupled to one end of the cage holder 200 when the cage is inserted between the vertebrae, thereby supporting the movable body 120 coupled to the support 100. 100) It is configured to be able to support the support 100 when towing to the inside, that is, the through-hole side.

The upper surface 102a and the lower surface 102b of the support 100 are formed with a second through hole 104 of a predetermined size, respectively, so that the bone formation material and the vertebrae filled in the cavity can be fused together. In the outer surface, grooves 106 having a predetermined depth are formed, and when the cage is inserted between the vertebrae, the contact area between the vertebrae and the cage is increased to increase the bonding strength between the vertebrae and the cage, and the frictional force is increased. Prevents cage from slipping or falling off due to patient load.

In addition, the openings 110 formed on the other side of the support 100 are formed with tapered tapes narrowing toward the first through holes 101, and the surface of the taper has a plurality of tapers at regular intervals, for example, three or more. Since the first wedge 112 is formed, the movable body 120 inserted into the opening 110 is configured to be fixed by the first wedge 112 while moving along the taper.

Meanwhile, the movable body 120 is inserted into and fixed to the opening 110 of the support 100, and the plurality of second wedges 122 are fixed at regular intervals so as to be engaged with the first wedge 112 on the upper and lower surfaces thereof. The fixing grooves 124 having a predetermined depth are formed on both side surfaces thereof so that the movable body 120 can be gripped by the cage holder 200 while being coupled to the support 100.
At this time, as shown in Figure 2, the first wedge is the inside of the support from the end of the support (that is, the end of the support located on the side opposite to the side formed with the first through hole) located on the opening side A long inclined surface extending in a direction and a short reverse inclined surface that forms a predetermined angle (eg, an acute angle) with the long inclined surface and extends outward from the long inclined surface in the outward direction of the support. An inclined surface having a long length of another first wedge adjacent to the first wedge is connected to the first wedge. Similarly, the second wedge has an elongated inclined surface extending from the end of the movable body located in the direction of insertion of the opening of the support body in the outward direction of the movable body and a predetermined angle (eg, an acute angle). A long inclined surface extending from the long inclined surface to an inner direction of the movable body, and a long inclined surface of another second wedge adjacent to the second wedge is connected to the short reverse inclined surface. . That is, the long inclined surfaces of the first wedge and the second wedge are formed such that the inclined directions are opposite to each other, and similarly, the short reverse sloped surfaces of the first wedge and the second wedge are inclined in opposite directions. Formed. Thus, when the movable body is inserted into the opening of the support, the long inclined surface of the second wedge slides in contact with the long inclined surface of the first wedge, and the short reverse inclined surface of the second wedge is short of the first wedge. Since the inclined surface is engaged with the inclined surface, the movable body 120 is movable along the taper, and after the movement, the movable body 120 is firmly fixed without retreating.
In this configuration, when the movable body 120 moves inside the support body 100, the upper surface 102a and the lower surface 102b of the support body 100 move at a predetermined angle from the central axis according to the moving distance of the moving body 120. The upper surface 102a and the lower surface 102b of the support 100 are opened at an angle of 0 °, 5 ° or 8 ° from the central axis, as shown in FIG. The height is gradually increased from one side to the other side. At this time, by forming the uneven portion 130 at regular intervals on the inner surface of the support 100 as shown in Figure 2 to distribute the load applied to the support 100 through the moving body 120 to the uneven portion 130 It is also possible to prevent the support 100 from being damaged.

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[Cage holder]

Figure 4 is an exploded perspective view showing the configuration of the cage holder for inserting the expandable spinal implant cage between the vertebrae, Figure 5 is a cross-sectional view showing a state in which the cage holder shown in FIG.

4 and 5, the cage holder 200 according to the present invention includes a bar-shaped shaft 220, a head portion 210 connected to one end of the shaft 220, and a shaft ( An inner cylinder is formed in a hollow cylindrical shape so as to insert the other end of the 220, and the grip portion 274 is formed in two parts to grip the moving body 120 in a form surrounding both sides of the cage for spinal implants on one side of the body. 270, a hollow inner cylinder holder 240 connected to the other side of the inner cylinder 270 and penetrating the shaft 220 therein, and one side of the body with the shaft 220 interposed therebetween. The other side of the body is fixed and coupled to one side of the inner cylinder holder 240, the guide portion 230 is formed in a hollow cylindrical shape formed with a male thread 232 along the outer diameter of the body, and a through hole (inside) 251 is formed and is engaged with the male thread 232 at the upper end of the through hole (251) A female thread 252 is formed, and a lower end portion of the through hole 251 is provided with a knob 250 having a stepped portion 254 formed therein so as to be inserted by one side of the inner cylinder holder 240 and an inner cylinder 270 therein. It is configured to include an outer cylinder 260 made of a hollow cylindrical shape to be inserted).

The shaft 220 is configured in the form of a cylindrical bar, and a threaded portion 224 is formed at one end thereof so as to be connected to the guide portion 230. In addition, one end of the shaft 220 is formed with a fixing portion 222 made of a diameter larger than the body diameter of the shaft 220 so as not to be separated from the state inserted into the head portion 210.

Head portion 210 has a through hole 212 of a predetermined size is formed in the center of the body to be inserted in the state in which the shaft 220 is connected to the guide portion 230, the guide portion in the inner diameter of the through hole 212 A thread is formed to fix one end of the 230.

The inner cylinder 270 is made of a hollow cylindrical shape so that the shaft 220 can be inserted therein, one side of the body is opened in two branches, the grip portion 274 is formed to grip the fixing groove 124 of the cage , The other side of the body is formed with a screw thread (271) to be connected to the inner cylinder holder (240). In addition, the grip part 274 is provided with a stepped part 272 inserted into the outer cylinder 260 to control the degree of the grip part 274 being opened.

The outer cylinder 260 is formed in a hollow cylindrical shape to allow the shaft 220 and the inner cylinder 270 to be inserted, and at one end thereof corresponds to the shape of the stepped portion 272 so as to adjust the opening degree of the grip portion 274. A stepped portion is formed.

Meanwhile, an 'I'-shaped slit 262 penetrating the body may be further formed at a predetermined position of the outer cylinder 260. In this case, the surface of the inner cylinder 270 may be formed at a position corresponding to the slit 262. A stopper 276 having a predetermined height must be formed to protrude through the slit 262. Through this configuration, the outer cylinder 260 may move by the length of the slit 262 along the longitudinal direction of the inner cylinder 270, and when the outer cylinder 260 is moved, the stopper 276 rotates the slit 262 by moving in the horizontal direction. Hooked at both ends of the outer cylinder 260 is fixed to the surface of the inner cylinder (270).

The inner cylinder holder 240 is formed in a hollow cylindrical shape so as to penetrate the shaft 220 therein, one side is formed with a screw portion to fix one end of the inner cylinder 260, the other side inside the knob 250 A wing 242 larger than the body diameter of the inner cylinder holder 240 is formed to be restrained in the inserted state. In addition, on the other side of the inner cylinder holder 240, a pair of guide grooves 242 of a predetermined length are formed in the longitudinal direction of the inner cylinder holder 240.

Guide portion 230 has a pair of guide bar 234 is formed on one side to be engaged with the guide groove 242 of the inner cylinder holder 240, the male thread to be coupled to the knob 250 in the center 232 is formed, and the other side is formed with a screw thread to be inserted into the through-hole 212 of the head portion 210 to be fixed.

The knob 250 has a through hole 251 penetrating the body in the longitudinal direction in the center, and the upper end of the through hole 251 is female threaded so as to be engaged with the male screw portion 232 of the outer cylinder holder 230. 252 is formed, and a stepped portion 254 is formed at the lower end of the through hole 251 so as to restrain the wing 242 of the inner cylinder holder 240 inside the through hole 251.

When the knob 250 is rotated through this configuration, the female thread 252 of the knob 250 is moved vertically along the male thread 232 of the guide part 230, and the through hole of the knob 250 is rotated. The inner cylinder holder 240, which is constrained inside, moves along the guide bar 234 of the guide part 230, and as a result, the inner cylinder 270 connected to the inner cylinder holder 240 is the inner cylinder holder ( Along the 240 is moved along the movement direction of the knob 250.

[How to use]

6 to 9 are views showing the use of the expandable spinal implant cage and cage holder according to the present invention.

The outer cylinder 260 constituting the cage holder 200 is moved to the head portion 210 side so that the grip portion 274 of the inner cylinder 270 is opened. At this time, the stopper 276 of the inner cylinder 270 is fixed to the lower end of the slit 262 formed in the outer cylinder 260.

Next, the cage is inserted into the grip portion 276, so that the side of the cage is located in the longitudinal direction of the grip portion 276 so that the end of the grip portion 276 can grip the fixing groove 124 of the cage. At this time, the cage is inserted into the grip portion 276 in a state filled with bone formation material in the cavity, so that one end of the shaft 220 can be supported by the first through hole 101 formed on one side of the cage. .

Then, the outer cylinder 260 is moved in the cage direction so that the distance between the grip portion 276 is narrowed so that the end of the grip portion 276 is inserted into the fixing groove 124 of the movable body 120. (See Figure 7)

In this state, the cage is inserted between the vertebrae from which the disk is removed, and then the knob 250 is rotated to move in the direction of the head portion 210. The inner cylinder holder restrained inside the through hole 251 of the knob 250. The 240 is raised along the guide bar 234 of the guide portion 230.

In addition, the inner cylinder 270 connected to the inner cylinder holder 240 moves in the movement direction of the inner cylinder holder 240, and the movable body 120 of the cage fixed to the grip part 276 of the inner cylinder 270 is the inner cylinder. Along with the moving direction of 270 is moved together. At this time, when the support body 100 of the cage is supported by the shaft 220 and the inner cylinder 270 moves to the head portion 210 side, the movable body 120 moves along the taper of the support body 100 to the first through hole 101. It moves to the side), thereby causing the upper surface (102a) and the lower surface (102b) of the support 100 to open in the upper and lower directions. (See FIG. 8)

Here, the degree of opening of the cage, ie, the support 100, depends on the degree of rotation of the knob 250, which depends on the distance that the moving body 120 moves toward the first through hole 101 side of the support 100. Means. In other words, the degree of opening of the cage may vary depending on how the first wedge 112 formed in the opening 110 of the support 100 and the second wedge 122 of the movable body 120 are engaged. By adjusting the degree of rotation of the knob 250 according to the movable body 120 to move along the first wedge 112 formed on the taper of the support 100 by one space to adjust the degree of the cage opening. (See FIG. 9)

As described above, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be defined by the appended claims and equivalents thereof.

1 is an exploded perspective view showing the configuration of a cage for an expandable spinal implant according to an embodiment of the present invention.

Figure 2 is a cross-sectional view showing the configuration of the expandable spinal implant cage according to another embodiment of the present invention.

3 is a cross-sectional view showing an angle change of the cage for the expandable spinal implant according to an embodiment of the present invention.

Figure 4 is an exploded perspective view showing the configuration of the cage holder for inserting the expandable spinal implant cage between the vertebrae in accordance with the present invention.

5 is a cross-sectional view showing a state in which the cage holder shown in FIG.

6 to 9 show the use of the expandable spinal implant cage and cage holder according to the present invention.

<Description of main parts of drawing>

100: support 101: first through hole

102a: upper surface 102b: lower surface

104: second through hole 106: groove

110: opening 112: first wedge

120: mobile body 122: second wedge

124: fixing groove 130: irregularities

200: cage holder 210: head portion

220: shaft 230: guide portion

240: inner cylinder holder 250: knob

260: outer cylinder 270: inner cylinder

Claims (8)

A through hole is formed at one side of the body, and a taper having a narrower shape toward the through hole is formed at the other side of the body, and a 'c' shape having an opening having a plurality of first wedges formed at regular intervals on the surface of the taper. Support; And The second wedge is formed on the upper surface and the lower surface to be inserted into the opening and engaged with the first wedge to move along the taper, and both sides have a trapezoidal shape having a fixed groove having a predetermined depth for gripping with the cage holder. Moving bodies; It is configured to include, The cage for an expandable spinal implant, characterized in that the support is opened in the upper and lower direction while the moving body moves along the taper to the inside of the support. The method of claim 1, The first wedge has a long inclined surface extending in an inward direction of the support from an end located at an opening side of the support, and a short reverse inclined surface extending at an acute angle with the long inclined surface and extending in an outward direction of the support. Configured; The second wedge has a long length extending in an outward direction of the movable body from an end positioned in a direction moving inward of the support among the ends of the movable body so that the inclined directions thereof are opposite to each other. And an inclined surface and a short reverse inclined surface extending at an acute angle with the long inclined surface and extending in the inward direction of the movable body from the long inclined surface. The method of claim 1, On the outer surface of the support, Cavity for expandable spinal implant, characterized in that the groove portion of a predetermined depth formed side by side at regular intervals. The method of claim 1, Inside the support, Cage for expandable spinal implant, characterized in that a plurality of irregularities are formed at regular intervals. The method of claim 1, The support, The cage for an expandable spinal implant, characterized in that the upper surface and the lower surface of the support is formed in a plurality of angles from the central axis in accordance with the distance to move the inside of the support. In the cage holder for inserting between the vertebrae, the cage consisting of a 'c' shaped support having an opening formed at one side and a movable body inserted into the opening to adjust the height of the support, A bar shaft; A head portion connected to one end of the shaft; An inner tube is formed in a hollow cylindrical shape to insert the other end of the shaft inside the body, and the grip portion formed in two parts to grip the movable body in a form surrounding both sides of the cage for spinal implants on one side of the body. ; A hollow inner cylinder holder connected to the other side of the inner cylinder and penetrating the shaft therein; One side of the body with the shaft interposed therein is fixed to the head portion, and the other side of the body is connected to one side of the inner cylinder holder is connected, the guide portion formed in a hollow cylindrical shape with a male thread formed along the outer diameter of the body Wow; A through-hole is formed therein, a female thread is formed at an upper end of the through-hole so as to be engaged with the male thread, and a stepped portion is formed at the lower end of the through-hole so that one side of the inner cylinder holder can be inserted and restrained; And An outer cylinder made of a hollow cylinder to insert the inner cylinder therein; Consists of including Rotating the knob adjusts the height of the support by engaging the female thread and the male thread with each other and moving upward or downward to move the inner cylinder holder confined inside the through hole of the knob along the moving direction of the knob. Cage holder, characterized in that it is configured to be. The method of claim 6, One side of the inner cylinder holder is formed with a pair of guide grooves, One side of the guide portion is formed with a pair of guide bars to be engaged with the pair of guide grooves, And rotating the knob is configured to move the inner cylinder holder connected to the inner cylinder along the pair of guide bars. The method of claim 6, The predetermined position of the outer cylinder is formed with a 'I' shaped slit penetrating the body, A stopper having a predetermined height penetrating the slit at a position corresponding to the slit is formed on the surface of the inner cylinder, The outer cylinder, The cage holder is moved along the longitudinal direction of the slit, and configured to be fixed at both ends of the slit.

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