KR20200067517A - Flexible rod for spinal fusion surgery - Google Patents

Abstract

The present invention relates to a flexible rod for spinal fusion surgery which comprises: a basic rod totally formed in a bar shape, including a post part, and having a reception part disposed on at least one of both end parts of the post part; a moving rod totally formed in the bar shape, including a post part, and having a locking step disposed on at least one of both ends of the post part; a connection housing fixed to the basic rod with a structure connecting an edge to the reception part and including a through-hole type locking hole and internal space having a size which can receive receiving the locking step of the moving rod therein and expose the major part of the post part, except the locking step, to the outside to allow relative movement of the moving rod and prevent separation of the same; and a first elastic body interposed between the reception part of the basic rod and the locking step in the connection housing when the basic rod and the moving rod are connected through the connection housing and including elastic recovery force. Accordingly, the flexible rod secures motility of a joint applying spinal fusion surgery thereto, thereby allowing the degree of freedom of the joint within a predetermined range and largely reducing risk that stress is concentrated on a joint adjacent to a surgery portion and thus spinal damage is extended the adjacent portion after a long period.

Description

Flexible rod for spinal fusion surgery {FLEXIBLE ROD FOR SPINAL FUSION SURGERY}

The present invention relates to a flexible rod for vertebral fusion, and more particularly, is used in vertebral fusion to fix two or more vertebral bodies with appropriately spaced intervals to secure structural stability when the intervertebral joint is damaged. As a spinal support rod, it relates to a flexible rod for spinal fusion, particularly suitable for application to posterior lumbar interbody fusion (PLIF).

The human spine is composed of a large number of vertebrae connected to each other with a lumbar vertebral disc (also called an intervertebral disc, or intervertebral disc), also called a vertebral disc. The vertebrae corresponding to the thoracic vertebrae, and the lumbar vertebrae of the lower back are divided.

The vertebral disc is a discoidal scapula between the vertebrae, more specifically, the vertebral body, which is the cylindrical part of the vertebrae, the outer surface of which is composed of relatively hard fibrous rings, and the inside is composed of jelly-like nuclei. That is, it acts as a cushion between the vertebrae, absorbs shock, and functions to facilitate joint movement between the vertebrae, and the vertebrae have structural characteristics through these vertebral discs between the vertebrae. It is possible to secure a flexible bending motion in various directions.

On the other hand, the vertebrae have a cylindrical vertebral body, which is a part directly connected with an adjacent vertebra and a vertebral disc, and various protrusions extending in the same direction from the vertebral body. The projections protruding vertically are called spinous processes, and the two projections located symmetrically on the left and right sides of the spinous processes are called transverse processes.

As the name is called separately, the cervical vertebrae, thoracic vertebrae, and lumbar spine that form the spine may have somewhat different appearances in the shape, number, etc. of the above-mentioned protrusions, but extend from the vertebral body to the dorsal direction from the outer surface of the vertebral body. In the part surrounded by the formed protrusions, the spinal cord, which is an important organ for transmitting signals to each part of the body extending from the brain, passes through and has a form in which a hole, a space for protecting it, is commonly formed.

Therefore, the human spine is an organ that protects the spinal cord, which is an important organ at the same time as it plays an important role as a central pillar for supporting the body, and when an abnormality occurs in the spine, problems related to the support of the entire body occur. Of course, various neurological symptoms are also very likely to occur.

Many of these spine-related diseases are treated or treated by surgical procedures. For example, the fibrous ring surrounding a portion of the hydronucleus due to increased pressure in the spinal disc due to narrowing of adjacent vertebral bodies. In the case of intervertebral disc prolapse, which is a disease that ruptures or protrudes into the spinal canal and compresses the vertebral nerve, it can be treated by exercise therapy when the symptoms are mild, or by simple surgery such as removal of the protrusion by laser, but severe instability When accompanied, surgery may be performed to restore the gap between the narrowed vertebral bodies to the original position and then install an implant to support this condition.

In addition, if a fracture occurs in the vertebral body, or some part of the vertebrae dislocated due to an accident or other cause, even in the case of severe scoliosis, the spine is severely deformed from its original form, correct the wrong vertebrae or repair the damaged vertebrae. For the purpose of protecting, supporting, etc., surgery is performed to install the implant as described above.

That is, instead of giving up exercise function as a joint, in order to maximize structural stability, after restoring the intervals of adjacent vertebrae to the original intervals, surgery to fix them is generally performed, and thus the mutual positions between the vertebral bodies are fixed. This is called spinal fusion surgery.

Vertebral fusion usually involves the following procedure, first removing some or all of the damaged vertebral discs, and then interposing the cage, the prosthesis of the brace function to maintain bone gap, between the affected vertebral bodies.

Thereafter, the pedicle screws are fixed to the adjacent upper and lower vertebrae, respectively, and a structure capable of gripping the rod of the rod is formed in the head portion of the pedicle screw described above, thereby vertically parallel to the longitudinal direction of the spine. The rod is securely fixed across two or more vertebrae in the direction.

In particular, in the case of posterior lumbar intervertebral fusion (PLIF), the pedicle screw is radially protruding from the vertebral body to the vertebral body in the center of the spine so as to face the vertebral body in the vicinity of two transverse protrusions, and the two are fixed symmetrically.

Such a surgical form can also be confirmed through FIGS. 7 and 9, which are drawings showing an embodiment of the present invention.

That is, by fixing the two or more vertebrae firmly by applying a screw and a support rod in a structure as described above, correct the position of the incorrect vertebrae or restore the gap between the vertebrae, and apply the force applied to the fractured vertebrae. By providing functions such as supporting in a dispersed state, it is possible to alleviate and treat various diseases or neurological symptoms from spinal abnormalities, but the spine of the part where the rod is usually made of a hard metal material such as titanium is installed. Since the joint is fixed so that it cannot bend, the mobility of the original vertebral joint is lost, so the degree of freedom of the patient undergoing surgery is greatly limited, and the stress generated in the joint movement is not distributed to many joints and is fixed. By intensively applying to the adjacent joint site, a problem that often causes damage to the surrounding joints often occurs over a long period of time after surgery.

To compensate for these shortcomings to impart even finer mobility and reduce stress on the surrounding joints, as shown in FIG. 10, a product is provided with a flexible slot-shaped flexible portion in the center portion instead of a simple rod-shaped rod. Although there is, this is only provided in an integrated form, and flexibility is very limited, so it is difficult to expect a sufficient stress distribution effect, and it hardly contributes to securing mobility.

As a product for resolving these problems, by having a ball joint connection as shown in FIG. 11 through the Republic of Korea Patent No. 10-1196780 possessed by the inventor of the present invention (or a person having the right to apply) A flexible spinal support rod has been disclosed.

That is, in the registered patent, the first body 201 and the second body 202 each having a pillar portion are connected by a ball joint connection structure via a spherical protruding portion 16 and a spherical concave receiving portion 17, Disclosed is a structure in which various elastic bodies, such as a leaf spring, for accommodating a bending motion in the connection part and a stretching spring in response to the motion of the spine are coupled together.

Through this structure, while maintaining a desirable distance between the vertebral bodies while allowing a fixed intervertebral body movement within a certain range, a theoretical solution is proposed to disperse the concentration of stress in normal joints adjacent to the surgical site while securing mobility. However, as shown in FIG. 11, the number of parts is too large, and as a result, assembleability is significantly reduced, and there is a problem that there is a high risk of disengagement at any one of many assembly and joining parts in the finished product.

In particular, many parts have been proposed mainly for hard parts, and when these parts are broken in an implanted state in the human body and are dispersed into tissues in the human body, a serious situation may occur.

In the end, the product disclosed as the registered patent provides a theoretically good solution, but it is not easy to commercialize due to too many parts and assembly labor in actual product manufacture, and there is a concern in terms of safety for application in the human body. The disadvantage is that it is almost impossible to pass the licensing process for commercialization.

Republic of Korea Registered Patent No. 10-1196780

"Posterior dynamic stabilization of the lumbar spine: pediclebased stabilization with the AccuFlex rod system" Neurosurg. Focus / Volume 22 / January, 2007

In order to overcome the above-mentioned problems of the prior art, the present invention secures mobility between the vertebrae fixed to each other by spinal fusion within a certain range, thereby dispersing the stress applied to the vertebral joints around the surgical site, even after prolonged elapse. It is an object of the present invention to provide a flexible rod for spinal fusion, which may not cause damage to the surrounding joints.

In addition, it provides a more natural and smooth motion compared to the structure proposed in the registered patent No. 10-1196780 possessed by the inventor of the present invention, and provides a flexible rod for spinal fusion surgery in which the deterioration of motor function is significantly reduced even when used for a long time. It aims to do.

In addition, another object of the present invention is to provide a flexible rod for spinal fusion, which is easy to manufacture and has secured structural rigidity in a commercialized state.

In addition, another object of the present invention is to provide a flexible rod for spinal fusion, which has excellent product stability and can be used for a long time.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by those skilled in the art from the following description. Will be able to.

The flexible rod for spinal fusion according to the present invention for achieving the above object, in the support rod used for spinal fusion, is formed in a bar shape as a whole, and has a pillar portion, and is seated at at least one end of both ends of the pillar portion A basic rod having a portion, which is formed in a bar shape as a whole, having a pillar portion, a flow rod having a locking jaw at at least one end of both ends of the pillar portion, and fixed to the basic rod with a structure in which an edge is connected to the seat The inside of the flow rod accommodates the locking jaw, and most of the pillar portions other than the locking jaw are exposed to the outside to allow the relative movement of the flow rod relative to the basic rod while preventing departure. A connection housing having a through-hole type locking hole and an inner space, and in a state in which the basic rod and the flow rod are connected via the connection housing, between the seating portion of the basic rod and the locking jaw in the connection housing It is interposed and comprises a first elastic body having an elastic restoring force.

In this case, in a state in which the basic rod and the flow rod are connected via the connection housing, a second elastic body interposed between the inner surface of the connection housing and the locking jaw may further include an elastic restoring force. .

At this time, the seating portion has the same or a spherical shape having a radius of curvature that varies while maintaining differential continuity, and the first elastic body interposed between the seating portion and the locking jaw of the flow rod is in contact with the seating portion. The shape of the surface may be the same as the spherical shape of the seating portion, or may have a suitable curvature having a radius value of a difference within 10%.

Furthermore, in the first elastic body interposed between the seating portion and the locking jaw, a surface contacting the locking jaw may be formed in conformity with a contact surface of the locking jaw.

Meanwhile, the first elastic body may have a pad shape made of a single material of natural or synthetic elastomer.

Moreover, the first elastic body may be a silicone elastomer material.

Meanwhile, the second elastic body is made of a single material of natural or synthetic elastomer, and may be formed in a ring shape to accommodate the pillar without passing through the locking jaw of the flow rod.

At this time, the second elastic body, the shape of the inner surface of the connection housing and the contact surfaces of the locking jaws, respectively, are formed in conformity with their contact surfaces, in order to allow smooth movement of the flow rod, at least one of the two contact surfaces. One side may have a shape in which the outer edge is chamfered.

Further, the second elastic body may be a thermoplastic polyurethane elastomer material.

On the other hand, a marker capable of confirming the elastic flow state of the flow rod may be coupled to the pillar portion of the flow rod.

On the other hand, another form of the flexible rod for spinal fusion according to the present invention is configured to further include at least two multi rods having the seating portion or the locking jaw at both ends of a pillar portion formed as a whole. By providing the above-described connection housing, it can be configured to allow bending/extension in at least two positions and to simultaneously fix at least three or more vertebral bodies.

The flexible rod for spinal fusion according to the present invention described above has the following effects.

First, by securing the mobility of the joint to which the vertebral union is applied, the degree of freedom of joints is allowed within a certain range, and the stress is concentrated on the joints adjacent to the surgical site, greatly reducing the risk of vertebral damage spreading to the adjacent areas after a long period of time.

Second, while securing the mobility of the joint to which the spinal fusion is applied, it is possible to implement a sturdy structure with a very low risk of product damage even during long-term use.

Third, it is possible to provide a semi-permanent product that ensures the mobility of the joint to which the spinal fusion is applied, while maintaining its original function even for long-term use.

Fourth, the ease of manufacturing is high because the number of parts and assembly is minimized.

1 is a perspective view showing the overall shape of a flexible rod for spinal fusion according to a first preferred embodiment of the present invention,
2 is a cross-sectional view of the flexible rod of FIG. 1,
3 (a) and (b) are perspective views showing the shapes of the connection housings of the flexible rod of FIG. 1, as viewed from above and below, respectively.
4 (a) and (b) are perspective and side views, respectively, of the first elastic body of the flexible rod of FIG. 1,
5 (a) and (b) are perspective and cross-sectional views, respectively, of the second elastic body of the flexible rod of FIG. 1,
Figure 6 is a perspective view showing the operating state of the flexible rod of Figure 1,
7 is a perspective view showing a state in which the flexible rod of FIG. 1 is applied to the vertebrae according to spinal fusion;
8 is a perspective view showing the overall shape of a flexible rod for spinal fusion according to a second preferred embodiment of the present invention,
9 is a perspective view showing a state in which the flexible rod of FIG. 8 is applied to the vertebrae according to spinal fusion.

Hereinafter, the configuration of the flexible rod for spinal fusion according to the present invention described above will be described in more detail with reference to the accompanying drawings.

In addition, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of description, and terms specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator And definitions of these terms should be made based on the contents throughout this specification.

1 is a view showing the overall shape of a flexible rod for spinal fusion according to a first preferred embodiment of the present invention, the basic rod 10 having a bar-shaped pillar portion 100 and a seating portion 11, A flow rod 20 having a pillar portion 100 and a connecting housing 30 for connecting the basic rod 10 and the flow rod 20 in a relatively movable state are shown.

The flow rod 20 has a locking jaw 21 at one end, which is a component accommodated inside the connection housing 30 and is not shown in FIG. 1, and the flow rod 20 is a basic rod 10 And a marker 22 capable of confirming the degree of expansion and contraction as it is relatively stretched relative to the connection housing 30, and confirms the structure coupled to the surface. The marker 22 may be coupled to the surface of the pillar portion 100 of the flow rod 20 by a method such as laser etching.

FIG. 2 is a cross-sectional view of the flexible rod of FIG. 1, in particular, the structure inside the connection housing 30 can be clearly seen.

As shown in Figure 2, the flow rod 20 may be provided with a locking jaw 21 in the form of a disc at one end of the pillar portion 100 located inside the connection housing 30, which may be used alone or later. By engaging with the engaging hole 35 formed on the upper part of the drawing of the connecting housing 30 by the combination with the second elastic body 50 to be played, it serves to prevent the flow rod 20 from separating from the connecting housing 30 do.

That is, the connection housing 30, as shown in Fig. 3 (a) and (b) as viewed from above and below, respectively, only the shape of the connection housing 30, the upper portion of the drawing column of the flow rod 20 While the part 100 is exposed to the outside of the connection housing 30, it is possible to allow a certain range of movement, and the locking jaw 21 is provided with a locking hole 35 to prevent it from coming off.

On the other hand, as more clearly shown in Figure 3 (b), the lower edge in the drawing is formed in a form that can be combined with the seating portion 11 of the basic rod 10.

The combination of the connection housing 30 and the seating portion 11 may be implemented in various ways, but for a robust and stable structure, all parts in the connection housing 30 are assembled and the connection housing 30 is seated ( It is preferable to apply a non-separable permanent bonding method, such as laser welding, across the connection in the state of being combined with 11).

Hereinafter, the assembly steps and structures between the parts in the connection housing 30 will be described in more detail.

First, as shown in FIG. 2, the first elastic body is disposed in the form of a pad in contact with the surface between the seat 11 of the basic rod 10 and the upper locking jaw 21.

The first elastic body is preferably made of a natural or synthetic elastomeric single material, and more preferably a silicone elastomer material.

Silicone elastomers have superior tensile strength, elasticity and abrasion resistance than general organic rubbers, and unlike other organic rubbers, they do not have double bonds that react with oxygen, ozone, and ultraviolet rays in the atmosphere in the molecular structure to release bacteria. It is a weather-resistant material with little change in properties even after long-term use.

Moreover, while the compression permanent shrinkage of general organic rubbers increases significantly with temperature changes, silicone elastomers have almost constant elasticity and resilience in a wide temperature range from -100℃ to 250℃, so compression deformation under extreme conditions Excellent performance even when required.

In addition, it is hardly affected by polar organic compounds such as acids and alkalis, which are excellent in chemical resistance, and physical properties do not change even in a long-term moisture environment.

When only the first elastic body 40 is used alone without the second elastic body 50 to be described later, the thickness of the first elastic body 40 is the connecting housing 30 except for the thickness of the locking jaw 21 It is desirable to have a thickness sufficient to fill the interior space of the to maintain the overall shape of the flexible rod.

On the other hand, as shown in Figures 2 and 4, the surface of the seating portion 11 in contact with the first elastic body 40 may have a concave spherical shape, the corresponding abutting surface of the first elastic body 40 Again, it can have a convex spherical shape that is suitable for this.

This makes it easier to slide on the curvature contact surface even when the locking jaw 21 of the flow rod 20 presses the first elastic body, thereby making the relative bending movement of the flow rod 20 and the base rod 20 more visible. This is a configuration that can be performed smoothly.

The spherical surface may be formed of a spherical spherical surface having the same radius of curvature, but discontinuous short circuit does not occur, that is, a change in the radius value may be formed in a concave or convex surface shape of curvature having differential continuity, wherein the seating portion ( 11) the shape of the curved surface of the first elastic body 40 and the shape of the curved surface of the first elastic body 40 do not have to completely coincide, for example, when the seating portion 11 is formed in a concave curved shape, the agent contacting here 1 Since the radius of curvature of the convex curved surface of the elastic body 40 is less than that of the concave curved surface of the seating portion 11, it may be more preferable to provide a certain distance between the entire contact surface for a smooth sliding. However, even at this time, in order to maintain the surface contact supporting force, it is preferable that the difference in the radius of curvature of the corresponding position does not exceed 10%.

On the other hand, when the contact surface of the seating portion 11 and the first elastic body 40 is configured to make a slidable spherical contact for allowing a smooth bending operation, the contact surface of the first elastic body 40 and the locking jaw 21 is mutually It is preferable for the stable operation that the locking jaw 21 and the first elastic body 40 are in close contact and move in an integrated form when a pressure is applied to the locking jaw 21 and the operation is to be performed.

That is, as shown in FIGS. 2 and 4, when the contact surface of the locking jaw 21 is made of a flat surface, it is preferable to include a shaving plane area of the first elastic body 40 corresponding thereto.

On the other hand, as shown in Figures 2 and 2 is a perspective view, a cross-sectional view of Figure 5 (a), (b), between the locking rod 21 of the flow rod 20 and the inner surface of the connecting housing 30 A ring-shaped second elastic body 50 may be interposed.

The second elastic body 50 has a ring shape with a hole punched in the middle to allow exposure of the flow rod 20 columnar part 100 to the outside of the connection housing 30, and the locking jaw 21 and the connection housing ( 30) prevents the inner surface from directly contacting. That is, the elastic restoring force is applied between the locking jaw 21 and the inner surface of the connecting housing 30.

In this case, each thickness is set so that the entire thickness formed by the first elastic body 40, the locking jaw 21, and the second elastic body 50 fills the inner longitudinal direction of the connection housing 30, and The elastic restoring force of the elastic body 40 and the second elastic body 50 is applied to the entire flow rod 20 via the lower end in the drawing of the locking jaw 21 of the flow rod 20 and the pillar portion 100 extending therefrom. Works.

To this end, the second elastic body 50 is made of a single material of natural or synthetic elastomer, and more preferably, may be a thermoplastic polyurethane elastomer material.

The second elastic body 50 is a portion in which direct contact with the columnar portion 100 of the flow rod 20 occurs, and in a more complicated structure than the first elastic body 40, surface contact occurs in multiple directions, and the mat shape Compared to the ring shape, which has a higher risk of damage, higher wear resistance and strength are required.

That is, the polyurethane elastomer has a high friction abrasion resistance such as up to 10 times higher than steel and up to 5 times higher than rubber, and has excellent tensile strength (300-600 kg/cm2) and tear strength.

In addition, as a rubber-like elastic polymer, it has excellent elasticity (650%) and has good chemical resistance, ozone resistance, chemical resistance, and oil resistance.

Moreover, it has excellent adhesion to metals, and goes well with other parts according to the present invention, usually made of titanium, etc., and is a non-toxic eco-friendly material that is harmless to the human body.

Moreover, in the case of polycarbonate-based polyurethane (PCU), since it has been proven as a material having excellent biocompatibility without tissue side effects in the human body, polycarbonate polyurethane is applied as the material of the second elastic body 50 according to the present invention. It is desirable to do.

In the structural aspect, the second elastic body, as clearly shown through the cross-sectional view of Figure 5 (b), in order to prevent the non-uniform motion with respect to the movement due to the mutual shape mismatch of the contact surface, the mutual contact surface It is preferable to make it conformally.

That is, as shown, when the contact portion of the inner surface of the connection housing 30 and the contact portion of the locking jaw 21 are made of a flat surface, it is preferable to have a shaving plane area in contact with the second elastic body 50.

At this time, in order to allow a smooth movement of the flow rod to a certain degree, at least one of two abutting surfaces, that is, in the illustrated drawing, the outer edge of the abutting surface of the engaging jaw 21 has a chamfered shape. Can be configured.

According to this configuration, as shown in Figure 6 (a), the relative bending operation of the basic rod 10 and the flow rod 20, or as shown in Figure 6 (b), the basic rod 10 and the flow Relative stretching motion of the rod 20 becomes possible, and the spine even when the flexible rod according to the present invention is mounted through the ticicle screw 200 to mutually fix two adjacent vertebrae in the same manner as in FIG. 7 It is possible to allow a certain amount of movement within a safe range, which may occur due to rotation or bending of the joint.

That is, by allowing the patient's back movement to a certain degree even after spinal fusion due to the flexible rod flexibility according to the present invention, it can have an effect of dispersing the concentration of stress in the adjacent vertebral joint and securing freedom of movement.

Hereinafter, the configuration of the flexible rod for spinal fusion according to the second preferred embodiment of the present invention will be described in more detail with reference to FIGS. 8 and 9.

As shown in FIG. 8, the flexible rod according to the second embodiment of the present invention may further include a multi-rod 60 having locking jaws 21 formed at both ends of the pillar portion 100. Can be.

By including a multi-rod 60 having a locking jaw 21 formed at both ends as a component, two ends of the multi-rod are connected to two basic rods 10 formed with seating portions 11 at one end and two. It can be connected via the housing 30, which means that it allows bending/extension in at least two positions and can provide a function to simultaneously fix at least three or more vertebral bodies.

In the embodiment, the multi-rod 60 having the same locking jaws 21 formed at both ends is illustrated, but forming the locking jaws 21 or the seating portions 11 at both ends is only a simple selective problem, ' Needless to say, a multi-folding/extension flexible rod designed in various ways, such as a locking jaw-hanging jaw, a “hanging jaw-seating part”, and a “seating part-seating part” can be provided.

In the case of such a flexible bending/stretching rod, at least three or more vertebrae are provided to be fixed at the same time. As can be seen through FIG. 9 showing a state in which the flexible rod of FIG. 8 is mounted, the lower portion of the drawing is shown. When forming the pillar portion 100 of the basic rod 10 of the long, the upper three vertebrae are fixed in such a way that mutual joint motion is allowed using the flexible rod of this embodiment, and the lower two vertebrae are mutually A total of four vertebrae are fixed in a manner in which movement is not permitted, and vertebra fusion may be performed.

In fact, in the case of the vertebral joint, the closer to the thoracic vertebrae or the coccyx, also called the tailbone, the less the range of joint movement is compared to the central lumbar joint (typically the joints associated with lumbar 3-6), so some joints close to them are common It is also possible to provide a flexible rod according to the invention so that phosphorus full fixation fusion can be applied.

Although the embodiments according to the present invention have been described above, they are merely exemplary, and those skilled in the art will understand that various modifications and equivalent ranges of the embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be defined by the following claims.

10: default load
11: Seating
20: floating rod
21: Hanging jaw
22: marker
30: connection housing
35: Hang hole
40: first elastic body
50: second elastic body
60: multi load
100: pillar
200: pedicle screw

Claims (11)

In the support rod used in spinal fusion,
It is formed in a bar shape as a whole having a pillar portion, a basic rod having a seating portion on at least one end of both ends of the pillar portion;
A flow rod formed in a bar shape as a whole, having a pillar portion, and having a locking jaw at at least one end of both ends of the pillar portion;
It is fixed to the basic rod in a structure in which an edge is connected to the seating portion, accommodates the locking jaw of the flow rod therein, and most of the pillar portions other than the locking jaw are exposed to the outside to move the flow rod to the basic rod. A connection housing formed with a through hole in the form of a size to prevent relative movement while preventing relative movement, and an inner space; And
A first elastic body interposed between a seating portion of the basic rod and the locking jaw in the connection housing in a state in which the basic rod and the flow rod are connected via the connection housing; Characterized in that it comprises a, flexible rod for spinal fusion.
According to claim 1,
In the state in which the basic rod and the flow rod are connected via the connection housing, further comprising a second elastic body interposed between the inner surface of the connection housing and the locking jaw and having an elastic restoring force. , Flexible rod for spinal fusion.
The method according to claim 1 or 2,
The seating portion has a spherical shape having a curvature of a radius value varying while maintaining the same or differential continuity, and the first elastic body interposed between the seating portion and the locking jaw of the flow rod has a surface contacting the seating portion. A flexible rod for spinal fusion, characterized in that the shape is the same as the spherical shape of the seating portion or has a suitable curvature having a radius value of a difference within 10%.
According to claim 3,
The first elastic body interposed between the seating portion and the engaging jaw, characterized in that the contact surface of the engaging jaw is formed in conformity with the contact surface of the engaging jaw, flexible rod for spinal fusion.
According to claim 1,
The first elastic body, a flexible rod for spinal fusion, characterized in that the pad shape made of a single material of natural or synthetic elastomer.
The method of claim 5,
The first elastic body, characterized in that the silicone elastomer material, flexible rod for spinal fusion.
According to claim 2,
The second elastic body is made of a single material of natural or synthetic elastomer, characterized in that the flexible rod for spinal fusion surgery, characterized in that made of a ring shape to accommodate the pillar portion without passing through the locking jaw of the flow rod.
The method of claim 7,
The second elastic body, the shape of the inner surface of the connection housing and the contact surface of each of the engaging jaws are formed in conformity with their contact surfaces, to allow smooth movement of the flow rod, at least one surface of the two contact surfaces A flexible rod for spinal fusion, characterized in that the outer edge has a chamfered shape.
The method of claim 7 or 8,
The second elastic body, characterized in that the thermoplastic polyurethane elastomer material, flexible rod for spinal fusion.
According to any one of claims 1, 2, 5 to 8,
A flexible rod for spinal fusion, characterized in that the pillar portion of the flow rod is coupled with a marker capable of confirming the elastic flow state of the flow rod.
The method according to claim 1 or 2,
It is configured to further include a multi rod having the seating portion or the locking jaw at both ends of the pillar portion formed as a whole, thereby allowing bending/extension in at least two positions or more. And flexible rod for spinal fusion, characterized in that configured to be fixed to at least three or more vertebral bodies at the same time.

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