KR200372136Y1 - A variable type distance link for Vertebral fixation apparatus - Google Patents

Abstract

The present invention is made of a forming memory alloy that is flexibly variable at a predetermined temperature to maintain the spacing between the rods for pedicle correction, so that the top and bottom inclination deviation between rods caused by the pedicle screw is not uniformly lodged, or between the rods The present invention relates to a variable spacing device for a pedicle fixation device in which the shape and length of a transverse link are varied so that they can be easily spanned between rods when the left and right parallelisms are shifted.

In the present invention, a plurality of pedicle screw having a screw portion embedded in a plurality of adjacent pedicle, and a head portion having a receiving groove on the screw portion; In the spacing of the pedicle fixation device including a pair of rods connecting the plurality of pedicle screws, coupling hooks are formed at both ends so as to span a selected one of the head portion or a pair of rods of the plurality of pedicle screws. It is characterized in that it comprises a cross link made of a shape memory alloy that is transformed at a predetermined temperature.

Description

A variable type distance link for Vertebral fixation apparatus

The present invention relates to a spacer for maintaining a gap of a rod in a pedicle fixation device for firmly fixing a damaged or deformed pedicle in a corrected state, and more particularly, to prevent the rod from spreading. The present invention relates to a variable spacing device for a pedicle fixation device capable of facilitating a spinal correction procedure by manufacturing a supporting memory with a forming memory alloy that varies with temperature.

In general, the spine is usually composed of 24 bones (except sacral bones), which are connected by joint nodes, with discs between each joint. By this configuration, the vertebrae not only support the human posture while buffering, but also serve as the basis for exercise and protect the organs of the internal organs. However, as the spine lasts for a long time due to external anthropogenic, degenerative, or non-finish posture, when the spine is injured or twisted, it causes compression of nerves passing through the spinal canal, causing severe pain.

Patients with damaged parts of the spine are unable to perform activities necessary for personal life, and even if the degree of damage is not severe, the damaged parts of the spine are pressed or touched by other adjacent parts, causing pain.

Because of this, a pedicle fixation device must be inserted in the damaged or damaged part of the spine so that the damaged part is not pressed or pressed.

As shown in FIG. 1, the pedicle fixation device includes a U-shaped accommodating groove 101a, a head portion 101 having a female thread formed on an inner circumferential surface of the accommodating groove 101a, and inserted into the pedicle. Pedicle screw (100) having a threaded portion 102 is inserted into the upper and lower sides of the damaged spine and serves as a fixing stand; A rod 200 connected through each pedicle screw 100 to serve as a pedicle correction; The set screw 300 and the pedicle screw nailed to both sides of the pedicle are inserted into the receiving groove (101a), and fastened to the female thread formed therein to fix the rod (200), the wrench insertion groove (300a) formed on the top Consists of a transverse link 400 mounted across the pair of rods 200 so as not to gap between the (100).

The installation state of the pedicle fixation device according to the prior art will be briefly described with reference to FIG.

As shown in the figure, the screw portion 102 of the pedicle screw 100 is inserted into and fixed to each pedicle 500, the rod 200 in the U-shaped receiving groove (101a) formed in the head portion 101 Insert it into place.

After fastening the set screw 300 to the female thread formed in the receiving groove 101a in such a state, the hexagonal wrench or the like is inserted into the wrench insertion groove formed in the upper portion of the set screw 300 and rotated so as to rotate the set screw 300. The bottom surface presses the outer diameter of the rod 200 so that the rod 200 is fixed in the receiving groove of the pedicle screw 100. That is, the installation state of the rod 200 connecting between the pedicle 500 and the pedicle 500 is maintained firmly.

Between the rods 200 connected to the pedicle screw, both ends of the transverse link 400 are tightened to maintain the transverse spacing of the rods 200. When the transverse link 400 twists the waist of the body from side to side, the left and right rods 200 can be supported without opening, thereby preventing the pedicle from flowing minutely.

Conventional crosslinks 400 for preventing microscopic flow of the pedicle include a fixed housing 410 and a movable housing 420 fitted to the rod 200, respectively, as shown in FIG. The gap maintaining bar 430 and the fixed housing 410 and the movable housing 420 is fastened to the surface in contact with the rod 200, the gap maintaining bar 430 is set to press the rod 200 to be fixed Screw 440.

Each of the stationary housing 410 and the movable housing 420 has semicircular concave holes 410a and 420a formed in the shape of a tip in a tip portion so as to be coupled across the rod 200; Support holes 410b and 420b through which the gap retaining bars 430 are inserted and supported in the transverse upper portions of the concave holes 410a and 420a, and screw holes for fastening the set screw 440 to the upper surface. 410c and 420c.

In the conventional transverse link having the above configuration, after the concave hole 410a of the fixed housing 410 spans the one side rod 200, one end of the spacing bar 430 is fitted into the support hole 410b. After the movable housing 420 spans the other rod 200 ′, the other end of the spacer bar 430 is fitted into the support hole 420b. Finally, the set screw 440 is coupled to the screw holes 410c and 420c of each of the fixed and movable housings 410 and 420 to press the spacing bar 430 to load the rod 200 on the spacing bar 430. ) Is fixed.

In the above-described conventional rod gap maintenance cross link, the diameter of the concave hole 410a is formed to be substantially the same as the diameter of the connecting rod 200, so that the movable housing 420 may rotate with respect to the stationary housing 410. It is not intended. Accordingly, when any one of the pair of rods is inclined and the deviation occurs, or when the gaps between the rods 200 are not parallel, the cross link causes a problem that it is difficult to cope with such inclination, misalignment or parallelism. . That is, in the state where the parallelism between the rods 200 is shifted, the parallelism of the support holes 410b and 420b of the movable housing 420 and the fixed housing 410 is also shifted, so that the spacer bar 430 cannot be inserted. Even if the parallelism of the spacing bar 430 is forcibly adjusted, it is only possible to adjust the position of the movable housing 420 so that a part of the rod 200 may be separated from the concave hole 420a. In this case, even though the set screw 440 is fastened to the screw hole 420c of the movable housing 420, the spacing bar 430 and the connecting rod 200 cannot be tightly adhered to each other.

Structural problems with such a cross link may cause a delay in the operation time, and may also be omitted if the cross link cannot be installed.

Accordingly, the present invention has been proposed to solve the above problems, the pedicle screw is uniformly nailed by forming a transversal link that maintains the distance between pedicle correction rods and flexible memory at a predetermined temperature. In the case where the vertical tilt deviation between rods and the left and right parallelisms between the rods are misaligned, the variable spacing holder for the pedicle fixation device can be easily changed by varying the shape and length of the cross link. The purpose is to provide.

In addition, the present invention has a variable spacing for pedicle fixation device to form a middle portion of the cross-link to the coil structure to exert an elastic force when the external force is applied to the rod to cope with the micro-flow between the rods There is another purpose in providing.

Figure 1a is a perspective view showing the overall configuration of the spinal fixing device according to the prior art.

Figure 2 is a perspective view showing the installation state of the pedicle fixation device according to the prior art.

Figure 3 is an exemplary view showing the form of a crosslink according to the prior art.

Figure 4 is a perspective view showing an embodiment configuration of a variable spacing device for a spinal column fixing device according to the present invention.

Figure 5 is a front view showing the installation state of the variable spacing for the spinal fixing device according to the present invention.

Figure 6a and Figure 6b is a modified example of a variable spacing device for a spinal column fixing device according to the present invention.

Figure 7 is a perspective view showing a state in which the head portion of the pedicle screw as another embodiment of a variable spacing device for a spinal fixation device according to the present invention.

* Explanation of symbols for main parts of the drawings

10: cross link 11: link body

12: coupling hook 13: coil spring

14: Waveform 15: Slot

100: pedicle screw 101: head

101a: storage groove 200: rod

In order to achieve the above object, in the present invention, a plurality of pedicle screw having a screw embedded in a plurality of adjacent pedicle, and a head portion having a receiving groove on the screw top; In the spacer of the pedicle fixation device comprising a pair of rods connecting the plurality of pedicle screws, coupling hooks are formed at both ends so as to span a selected one of the head portion or a pair of rods of the plurality of pedicle screws And, it provides a gap retainer of the pedicle fixation device comprising a transverse link made of a shape memory alloy that is transformed at a predetermined temperature.

The cross-link in the present embodiment is formed in the form of a plate or annular bar, characterized in that the predetermined section of the middle portion is made of a coil form or a wave form.

In addition, a slot is formed on the outer circumferential surface of the head portion of the pedicle screw corresponding to the coupling hook so as not to be separated after the coupling hook end of the transverse link is fitted.

The slot is for preventing the coupling hook from being separated from the slot of the head when the transformed transverse link is restored.

The transverse link has a martensite phase at or below 10 ° C., which is the transformation temperature of the shape memory alloy, and has a property of transforming to an austenite phase at or above 36.5 ° C., so that the arrangement of the pedicle screw is displaced. Or when the parallelism of a rod does not match, since it installs in the state which changed the shape and length of a crosslink, it has the characteristic that installation work can be performed simply and quickly.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings of FIGS. 4 to 7.

Spacer retainer for pedicle fixation device according to the present invention can be easily mounted by varying the shape and length of transverse link even when the arrangement of pedicle screw is not uniform or the parallelism of rod is misaligned by using the transverse link made of shape memory alloy. It is implemented so that.

Prior to describing an embodiment of the present invention, a brief description will be made of a known shape memory alloy which is a material of a transverse link, which is the main part of the present invention.

In general, the shape memory alloy refers to an alloy that has a characteristic of always returning to a predetermined form at a predetermined predetermined temperature. For example, when a product is manufactured from the shape memory alloy, its shape is obtained by using it for a long time. Even though the temperature is very different, it is restored to its original form by adapting the previously designated or memorized temperature environment. That is, the shape memory alloy is transformed on marsite, and when heat is applied, the shape memory alloy is restored to its original shape on austenite, and the shape memory alloy is nickel (Ni). Since the manufacture of) / titanium (Ti) alloys, the practical use has progressed considerably, and now copper / zinc, copper / aluminum / nickel, copper / aluminum / manganese, copper / tin, nickel / aluminum, gold / copper / zinc alloy, etc. Many types of shape memory alloys are known.

Shape memory alloys are widely used in engineering and medical fields due to the fact that they always return to a specific shape at a specific temperature. For example, a shape memory alloy is used as an antenna of a satellite, a switchgear of a greenhouse window, an artificial joint, an orthodontic wire, and the like.

In an embodiment of the present invention, a transverse link is manufactured using a shape memory alloy which is harmless to the human body among these various shape memory alloys.

The cross link 10 in the embodiment according to the present invention, as shown in Figure 4, the link body portion 11; The hook body 12 is formed of a hook hook formed in both ends of the link body portion (11).

The cross-link 10 is made of a plate shape having a rectangular cross section, or consists of an annular bar having a predetermined diameter has a strength that can maintain the gap even if the position is misplaced by the external force applied to the rod.

The length of the transverse link 10 is usually 20 to 80mm, the length is set at 2mm intervals.

As shown in FIG. 5, the transverse link having the above-described configuration includes a support hook 12 wrapped around the rod 200.

The transverse link 10 includes an elastic part that is formed in a predetermined section in the middle of the link body part 11 and exerts an elastic force when a predetermined impact strength is provided to the rod 200.

The elastic part may be formed in the form of a coil spring 13 as shown in FIG. 6A or in the form of a curved wave form 14 which is continuously curved at a predetermined pitch interval as shown in FIG. 6B.

Due to the elastic structure of the cross-link 10 as described above, when the rod 200 twists the waist in a state in which the pedicle is corrected by maintaining the spacing and angle between the vertebrae properly, an external impact is applied to the waist. When stretched, the elastic portion exerts elasticity to absorb the load load acting on the rod.

On the other hand, in another form of the present invention, as shown in Figure 7, the transverse link 10 is formed in the "S" shape.

In addition, the coupling hook 12 of the cross-link 10 further includes a slot 15 formed in the circumferential direction on the outer peripheral surface of the head portion 101 of the pedicle screw 100 corresponding to the fitting. The slot 15 is intended to be more robust and support while preventing the coupling hook 12 from being separated from the slot 15 of the head 101 when the transformed transverse link 10 is restored in shape.

In the embodiment of the present invention, these link body portion 11, the coupling hook 12 and the elastic portion is made of a shape memory alloy that is transformed at a predetermined temperature.

The shape memory base material of the cross link 10 has a martensite phase at a transformation temperature of 10 ° C. or less, and has a property of transforming to an austenite phase at 36.5 ° C. or more.

The transverse link 10 is manufactured by rolling both ends of the shape memory base material in the shape of a hook, processing the center portion in a coiled shape, and then heating the shape memory heat treatment at about 650 to 700 ° C. for about 1 hour. It has the characteristics of shape memory alloy that changes at a certain temperature. Therefore, since the crosslink 10 has a martensite state at about 10 ° C. or less, which is a transformation temperature, its shape is easily deformed by external force at room temperature. The shape recovery temperature, which is a specific set temperature, is set to be transformed into an austenite state at 36.5 ° C. or more, which is the temperature of the human body set in the present invention.

Referring to the installation process and the operating state of the cross-link according to the present invention configured as described above are as follows.

First, the screw portion 102 of the pedicle screw 100 is coupled to the plurality of damaged or deformed pedicle sections in the vertical direction. Then, a pair of rods 200 are inserted into the receiving grooves 101a of the plurality of pedicle screws 100, and the set screws 300 are fastened to the receiving grooves 101a to fix the rods 200 so as not to flow. By completing the pedicle correction work.

Next, the transverse link 10 is mounted on the rod to maintain the gap between the pair of rods 200. At this time, prior to mounting the cross-link 10 to the rod 200, the cross-link 10 is transformed at room temperature (about 10 ℃) to increase the length of the link body portion 11, or coupling hook ( The diameter of 12 is widened so as to be easily spread over the rod 200. The coupling hook 12 of the transverse link 10 transformed as described above is extended over the outer circumferential surface of the rod 200, and the end of the coupling hook 12 is fixed to the slot 15 of the rod 200.

When the mounting operation of the cross-link 10 is completed, by providing a heat of a predetermined temperature using a surgical instrument for generating a heat source to the cross-link 10 to the shape recovery temperature 36.5 ℃ or more, the coupling hook The section in which the diameter of 12 is opened is transformed into an austenite state to restore the original shape.

In this case, the hook end fitted to the slot 15 is more firmly fitted in the process of restoring the shape of the coupling hook 12 so that the transverse link 10 is not separated from the rod 200.

As described above, even when the arrangement of the pedicle screw 100 is slightly misaligned or the parallelity of the rods 200 does not coincide, the cross link 10 is changed in shape so as to perform the coupling operation according to the mounting position. It is very simple to maintain the spacing of the.

As described above, embodiments of the present invention have been described in detail, but the present invention is not limited to the above embodiments, and various changes and modifications can be made by those skilled in the art within the scope of the technical idea of the present invention. Will be apparent to those of ordinary skill in the art.

As described above, according to the present invention, by manufacturing a cross-link that maintains the gap between a pair of rods for correcting a plurality of pedicles with a shape memory alloy transformed at a predetermined temperature, the deviation of the slope of the pair of rods occurs or parallelism In case of inconsistency, by converting the rod into a form that can be easily mounted on a pair of rods, the coupling is performed, and thus the gap maintenance operation can be easily achieved.

Claims (6)

A plurality of pedicle screws having a screw portion embedded in a plurality of adjacent pedicles, and a head portion having a receiving groove above the screw portion; In the spacing of the pedicle fixation device comprising a pair of rods connecting the plurality of pedicle screws, Coupling hooks are formed at both ends of the plurality of pedicle screw heads or a pair of rods so as to span a selected one of the plurality of pedicle screws. . The method of claim 1, Spacer retainer of the pedicle fixing device, characterized in that the transverse link is made of a plate. The method of claim 1, The interval retainer of the pedicle fixation device, characterized in that the predetermined section of the cross-link is made of a coil form. The method of claim 1, The interval retainer of the pedicle fixation device, characterized in that the predetermined section of the cross-link is made in a continuous wave form. The method according to any one of claims 1 to 4, And a slot formed on an outer circumferential surface of the head portion of the pedicle screw so that the coupling hook end of the transverse link is fitted therein. The method according to any one of claims 1 to 4, The transverse link has a martensite phase at or below 10 ° C., which is a transformation temperature of the shape memory alloy, and maintains an austenite phase at 36.5 ° C. or more.