KR102324934B1 - Vertebral fixation apparatus - Google Patents

Abstract

A spinal fixation device having a rod for fixing the spine to each other is disclosed.
The disclosed spinal fixation device is inserted and fastened to the spine, and includes a spinal fixation screw having a body part having a screw thread and a head part formed at one end of the body part; a accommodating member in which the spine fixing screw is installed therein, a through hole through which the body part penetrates is formed in the inner center, and the head part is installed on the through hole; a rod pressing member that is installed to be elevating in the receiving member and is positioned on the rod to apply pressure to the rod in the direction of the spinal fixation screw; and a pressure relay member positioned between the head and the rod in the accommodating member and having an upper surface pressed by the rod and a lower surface for pressing the head portion, wherein the pressure relay member is formed in the center of the upper surface, , a first deformable portion for allowing the outer periphery of the pressing relay member to be deformed in the direction of the head while the rod is pressed in close contact with the entire lower end of the rod; It is formed on the lower surface and further includes a second deformable portion adapted to be in close contact with the entire upper end of the head portion when the outer periphery of the pressure relay member is deformed, and the receiving member is formed on the inner side surface connected to the through hole, the head portion is installed, and the rod is pressed It further comprises a third deformable part to be deformed while in close contact with the entire lower end of the head part, the radius of curvature of the first deforming part is smaller than the radius of the rod, and the radius of curvature of the second deforming part is smaller than or equal to the radius of the upper part of the head part, The radius of curvature of the third deformable portion may be greater than or equal to the radius of the lower portion of the head.

Description

Spinal fixation device {VERTEBRAL FIXATION APPARATUS}

The present invention relates to a spinal fixation device having a rod for fixing the vertebrae to each other, and more particularly, by fastening a member that relays pressure between the rod and the spinal fixation screw to evenly distribute the pressure to maintain a continuous fixation force. It is about fixtures.

The spine plays an important role in supporting the body and maintaining equilibrium, as well as protecting the spinal cord. Various spinal diseases such as disc herniation, spondylolisthesis, degenerative spondylolisthesis, and spondylolisthesis, which cause pain in the spinal region, may occur, which may bring inconvenience to daily life.

Recently, spinal diseases are treated with minimal incision if possible, or surgery if possible, but there are cases where fusion with a screw called spinal fixation is sometimes required. In other words, stenosis accompanied by instability, severe lumbar spondylolisthesis in which the vertebrae fall forward, or relapse after disc surgery may require spinal fixation.

Spinal fixation surgery removes all the diseased discs between the vertebrae and the neighboring bones, inserts a disc-shaped support called a cage between them, and stabilizes the unstable vertebrae by fixing the spine with a spinal fixation device so that it does not cause problems again. It is a fundamental treatment method.

In the conventional spinal fixation device, when the head part of the spinal fixation screw in the receiving member rotates at a predetermined angle with the body part and then is fixed, the load by the rod directly affects the spinal fixation screw, so that the surface that engages the head part is may be worn out. In addition, the fixing force, which is a problem that the head of the spine fixing screw is easily separated from the receiving member, is weak. In addition, the residue generated when the rod guide member is cut from the receiving member in the procedure step may cause inflammation in the body tissue, thereby causing side effects of the procedure. In addition, since the fractured surface of the cut receiving member is uneven, the portion protrudes after the operation, and patients may feel uncomfortable in their daily life.

Registered Patent Publication No. 10-0324698 (2002.02.01.) Registered Patent Publication No. 10-0589728 (2006.06.07.) Korean Patent Publication No. 10-2001-0047359 (June 15, 2001)

The present invention was devised in view of the above points, and it is an object of the present invention to provide a spinal fixation device capable of facilitating the positioning of the spinal fixation screw at the start of the procedure and maintaining the continuous fixation force of the spinal fixation screw after the procedure. There is this.

A spinal fixation device having a rod for fixing a spine to each other, comprising: a spine fixing screw inserted and fastened to the spine, the body part having a screw thread formed therein, and a head part formed at one end of the body part; a receiving member in which the spinal fixation screw is installed therein, a through hole through which the body part passes is formed in the inner center, and the head part is installed on the through hole; a rod pressing member that is installed in the receiving member to be elevating and is positioned on the rod to apply pressure to the rod in the direction of the spinal fixation screw; and a pressure relay member positioned between the head and the rod in the accommodation member, the pressure relay member having an upper surface pressed by the rod and a lower surface pressing the head portion, wherein the pressure relay member includes the a first deforming part formed in the center of the upper surface and configured to deform the outer periphery of the pressurizing relay member in the direction of the head while the rod is pressed in close contact with the entire lower end of the rod; It is formed on the lower surface and further comprises a second deformable portion adapted to be in close contact with the entire upper end of the head portion when the outer periphery of the pressure relay member is deformed,

The accommodating member is formed on an inner side surface connected to the through hole, the head part is installed, and further includes a third deformable part configured to be deformed while in close contact with the entire lower end of the head part when the rod is pressed, and the curvature of the first deformable part The radius may be less than or equal to the radius of the rod, the radius of curvature of the second deformable portion may be less than or equal to the upper radius of the head portion, and the radius of curvature of the third deformable portion may be greater than or equal to the lower radius of the head portion.

A spinal fixation device having a rod for fixing a spine to each other, comprising: a spine fixing screw inserted and fastened to the spine, the body part having a screw thread formed therein, and a head part formed at one end of the body part; a receiving member in which the spinal fixation screw is installed therein, a through hole through which the body part passes is formed in the inner center, and the head part is installed on the through hole; a rod pressing member that is installed in the receiving member to be elevating and is positioned on the rod to apply pressure to the rod in the direction of the spinal fixation screw; and a pressure relay member positioned between the head and the rod in the accommodation member, the pressure relay member having an upper surface pressed by the rod and a lower surface pressing the head portion, wherein the pressure relay member includes the a first deforming part formed in the center of the upper surface and configured to deform the outer periphery of the pressurizing relay member in the direction of the head while the rod is pressed in close contact with the entire lower end of the rod; It may further include a second deformable portion that is formed on the lower surface to be in close contact with the entire upper end of the head portion when the outer periphery of the pressure relay member is deformed.

The accommodating member may further include a third deformable part that is formed on an inner side surface connected to the through hole, the head part is installed, and is deformed while being in close contact with the entire lower end of the head part when the rod is pressed.

The first deformable part, the second deformable part, and the third deformable part may satisfy at least one of Conditional Expressions 1 to 3 below.

<Condition 1>

<Condition 2>

<Condition 3>

Here, R ₁ denotes a radius of curvature of the first deformable part, R ₂ denotes a curvature radius of the second deformable part, and R ₃ denotes a curvature radius of the third deformable part. R _a means a radius of the rod, R _b means an upper radius of the head part, and R _c means a lower radius of the head part.

One of the pressing relay member and the receiving member may further include a locking part, and the other one may further have a locking groove, and the locking part may not be separated from the locking groove.

a guide member formed integrally with the receiving member to guide installation of the rod; and a cut neck positioned between the guide member and the accommodating member and recessed to separate and removed the guide member from the accommodating member when cutting in the operation step, wherein the cut neck has an outer periphery cutting groove on its outer periphery The inner periphery cut groove may be formed on the inner periphery to face the outer periphery cut groove horizontally and to be thinner than the outer periphery cut groove.

It may further include a protective film formed on at least one of the inner periphery and the outer periphery of the cut neck to prevent fragments from being generated during cutting, and to prevent tissue damage due to the fracture surface of the cut neck.

The guide member includes a first guide member and a second guide member positioned to face each other, and surrounds the first guide member and the second guide member and is positioned on one side, wherein the guide member is inserted into the spine It may further include a fixing ring for fixing to maintain the horizontal when the and to prevent shaking.

The fixing ring includes a ring body having a hole therein; a holding part formed on at least one side of the ring body and provided to hold the ring body when worn or separated from the spine; a ring groove positioned on the ring body and formed between the first guide member and the second guide member; and a seating portion having a groove positioned inside the ring body hole and configured to allow the guide members facing each other to be seated and fixed in the hole.

In the spinal fixation device according to the present invention, since the pressing relay member includes the first deformable part and the second deformable part, and the receiving member includes the third deformable part, pressure is evenly applied to the head of the spinal fixation screw by the pressing force of the rod. The fixing force of the spinal fixation screw can be maintained continuously.

In addition, in the spinal fixation device according to the present invention, one of the pressing relay member and the accommodating member is further provided with a locking part, and the other has a locking groove further formed, so that the fixing force can be improved so that the locking part is not separated from the locking groove. have.

In addition, the spinal fixation device according to the present invention may further include a protective film on the incised neck to prevent fragments from being generated during cutting, and to prevent damage to internal tissues of the body due to the fractured surface of the incised neck.

1 is an installation state diagram of a spinal fixation device according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view taken along line II-II' of Fig. 1, schematically showing a state in which a spinal fixation device and a bone cement injector are mounted on the spine.
Figure 3 is a cross-sectional view showing the spinal fixation device of Figure 1;
FIG. 4A is an enlarged cross-sectional view of part 'A' of FIG. 3, and is a view for explaining a coupling arrangement relationship between components;
Figure 4b is a view for explaining that the pressure relay member is deformed after the installation of Figure 4a.
5 is a plan view (a) and a side view (b) of a pressing relay member of the spinal fixation device according to an embodiment of the present invention.
Figure 6 is an enlarged partial cross-sectional view showing the main part of the spinal fixation device according to the embodiment of the present invention.
7 is a partially enlarged cross-sectional view illustrating a modification of FIG. 6 ;
8 is a side view (a) and a cross-sectional view (b) of the front in which the fixing ring of the spinal fixation device according to an embodiment of the present invention is installed.
Figure 9a is a plan view (a) and a cross-sectional view (b) of the front showing the fixing ring of Figure 8.
Fig. 9B is a plan view showing a modified example of Fig. 9A;
10 is a cross-sectional view and a partially enlarged view showing a state in which a rod is connected and installed to each of two guide members and a spinal fixation screw as a spinal fixation device according to another embodiment of the present invention.

Hereinafter, a spinal fixation device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Here, the accompanying drawings are illustrated by exaggerating or simplifying a part for convenience and clarity of explanation and understanding of the configuration and operation of the technology, and each component does not exactly match the actual size.

The vertebra 1 is a long bone structure supporting the body at the back of the body, and in detail, it refers to the vertebrae composed of the cervical, thoracic and lumbar vertebrae. Accordingly, the vertebrae 1 referred to below may refer to at least one of them.

1 is an installation state diagram of a spinal fixation device according to an embodiment of the present invention.

Referring to FIG. 1 , the spinal fixation device according to an embodiment of the present invention may include a spinal fixation screw 10 and a rod 30 for fixing the spine 1 . The rod 30 may mutually fix another vertebra 1b located in the same row as any one vertebra 1a of the vertebrae 1 . The rod 30 is mainly made of elastic material and is formed in a cylindrical shape and can be connected after inserting the spinal fixation screw 10 into the vertebrae of the upper and lower parts of the damaged disc. This connection can prevent the disc from being compressed by securing the distance between the vertebrae.

FIG. 2 is a cross-sectional view taken along line II-II' of FIG. 1, showing a state in which the spinal fixation device and the bone cement injector are mounted on the spine, and FIG. 3 is a cross-sectional view showing the spinal fixation device of FIG.

Referring to FIG. 2 , the spinal fixation device according to an embodiment may include a spinal fixation screw 10 and a guide member 70 for guiding the installation of the spinal fixation screw 10 . The spine fixing screw 10 includes a body portion 15 in which a thread is formed, and a head portion 13 formed at one end of the body portion 15 . An insertion hole (15a) may be formed inside the body portion (15). Through this insertion hole (15a), it is possible to inject a filler such as bone cement (C) using the injector (I). In this case, the injection hole 15b may allow the bone cement C to be uniformly distributed and extruded in a radial manner so as to be firmly fixed to the vertebrae. In general, when the spinal fixation screw 10 is operated on the patient's spine 1 in an osteoporotic state, bone cement (C) is injected into the patient's spinal cord (5) to obtain the necessary bone density, and the spinal fixation screw (10) ) and can form a osseointegration between the spinal cord (5).

2 and 3 , the spinal fixation device according to an embodiment of the present invention may include a rod 30 for fixing the vertebrae 1 to each other. The spinal fixation device is inserted and fastened to the spine (1), and a spinal fixation screw (10) having a threaded body part (15) and a head part (13) formed at one end thereof, a receiving member (75), and a rod pressing device. It may include a member 50 , a rod 30 , and a rod relay member 20 .

The body portion 15 has an entire outer circumferential surface of a screw thread, and the bone diameter becomes thicker as the screw thread moves toward the head portion 13 , and the distal end portion inserted into the spine 1 may be tapered. The thread may be formed in a double thread structure. That is, in the double thread structure, the pitch between the threads is approximately 2.7 mm, and the lead of the thread may be formed in two turns. Accordingly, the body 15 has a double screw thread structure, and when inserted at the same depth, the number of rotations is lower than that of the single thread screw structure, so that it can be more easily inserted into the spine 1 . In addition, the body portion 15 cannot be easily separated unless a forceful instrument is used in the opposite direction to be inserted as the fixing force is increased with respect to the spine (1). The thread shape of the body portion 15 is formed to be easily inserted in the direction of insertion, and when separated in the opposite direction, it is not separable by general manpower and can be formed in various ways if it is a shape to be separated only by a specific removal treatment device. . In addition, the body portion 15 may have an insertion hole 15a formed in the center of the entire inner portion and may communicate with the insertion hole 15a so that an injection hole 15b may be formed at an end of the body portion 15 . It is not limited thereto, and at least one of the insertion hole 15a and the injection hole 15b may be formed in the body portion 15 , and neither may be formed. The head part 13 is formed continuously with the body part 15 , and may serve to support the body part 15 from the receiving member 75 to be rotatable at a predetermined angle. In addition, the upper inner groove of the head part 13 may have a hexa shape and may be formed by sanding after removing foreign substances, cutting oil, and completely drying moisture.

The accommodating member 75 has a spine fixing screw 10 installed therein, a through hole 75a through which the body 15 penetrates is formed in the inner center, and the head 13 is formed on the through hole 75a. can be installed on In addition, the accommodating member 75 may be formed as a "U"-shaped groove so that the fixing rod 30 can be seated. The present invention is not limited thereto, and the accommodating member 75 may have a screw thread formed on one side of the inner periphery. The receiving member 75 may support the head portion 13 of the spinal fixation screw 10 . In addition, the receiving member 75 may further include a third deformable portion 75b formed on the inner side surface of the through hole 75a. The third deformable portion 75b is provided with the head portion 13 of the spinal fixation screw 10, and may be deformed while being in close contact with the entire lower end of the head portion 13 when the rod 30 is pressed. In addition, a movable guide groove 75d may be further formed in a portion formed on the inner side surface of the through hole 75a and extending from the third deformable portion 75b. The movable guide groove 75d may serve to support the head 13 and guide the movement of the body 15 when it rotates.

The rod pressing member 50 may be installed to be liftable in the receiving member 75 . The rod pressing member 50 may be positioned on the rod 30 to apply pressure to the rod 30 in the direction of the spinal fixation screw 10 . When the inner circumferential surface of the accommodating member 75 is formed of a screw thread, the rod pressing member 50 may be engaged and screwed together to further press the rod 30 to fix it.

Referring to FIG. 3 , the spinal fixation screw 10 according to an embodiment of the present invention may further include a guide member 70 integrally formed with the receiving member 75 to guide the installation of the rod 30 . . The guide member 70 may include a first guide member 70a and a second guide member 70b positioned to face each other. The first guide member 70a and the second guide member 70b may be separated and removed outside the body during the procedure. In addition, the guide member 70 is inserted from outside the body into the vertebrae of the body, and can be removed from the body by cutting leaving only the receiving member 75 in the procedure step.

In addition, the guide member 70 may be formed in a long cylindrical shape in which a through hole 75a is formed in the inner center. The guide member 70 is positioned to be inserted into the spine 1 from the outside of the patient's body. . In addition, the guide member 70 may guide the spinal fixation screw 10 to be installed at the position of the spine 1 requiring a treatment by inserting the spinal fixation screw 10 into the through hole 75a. Therefore, the spinal fixation device of an embodiment according to the present invention can install the spinal fixation screw 10 by using the guide member 70 without a separate dedicated installation mechanism to install the spinal fixation screw 10 . In addition, when the guide member 70 is inserted from the outside of the patient's skin to the inside, only a minimum skin area of about 2 cm can be incised, so that the patient recovers quickly after the procedure and side effects of the procedure can be reduced.

Figure 4a is a partial enlarged view of 'A' shown in Figure 3, a view for explaining the coupling arrangement relationship between the components, Figure 4b is a view for explaining that the pressure relay member is deformed after the installation of Figure 4a and FIG. 5 is a plan view (a) and a side view (b) of a pressure relay member of the spinal fixation device according to an embodiment of the present invention.

4A to 5 , the pressure relay member 20 is made of an elastic material and may be positioned between the head part 13 and the rod 30 in the accommodating member 75 . The pressing relay member 20 may have an upper surface pressed by the rod 30 and a lower surface pressing the head unit 13 . In addition, the pressure relay member 20 may include a first deformable portion 20a formed in the center of the upper surface and a second deformable portion 20b formed in the lower surface.

The first deformable portion 20a may cause the outer periphery of the pressurizing relay member 20 to be deformed in the direction of the head portion 13 while closely contacting the entire lower end of the rod 30 when the rod 30 is pressed. That is, the first deformable portion 20a has a radius of curvature smaller than the radius of the rod 30 , so that the rod 30 is the first deformable portion due to the pressure applied to the rod 30 while the rod pressing member 50 descends. (20a) can be pressurized. At this time, at least one expansion groove (not shown) may be further formed so that the first deformable portion 20a can be more closely attached to the entire lower end of the rod 30 . The expansion groove (not shown) installs a large rod 30 or further expands the first deformable portion 20a due to an increase in the load of the rod 30 pressure over time, resulting in loss and damage due to pressure load. may play a role in reducing The expansion groove (not shown) may have various shapes, such as a spherical surface, a triangular surface, and a square surface.

The second deformable portion 20b is a lower end of the pressure relay member 20 and may be installed in close contact with the entire upper end of the head portion 13 when the outer periphery is deformed. The radius of curvature of the second deformable portion 20b may be greater than or equal to the radius of the upper portion of the head portion 13 . Accordingly, due to the pressure applied to the rod 30 while the rod pressing member 50 descends, the second deformable portion 20b may be installed so as to closely and wrap the entire upper end of the head portion 13 . In this case, the head part 13 may reduce the pressure load applied from the rod 30 by the second deformable part 20b, but the center may be the same or may have an interval of up to 3 mm.

Accordingly, the radius of curvature of the first deformed portion 20a is less than or equal to the radius of the rod, the radius of curvature of the second deformed portion 20b is less than or equal to the radius of the upper portion of the head 13, and the third deformed portion The radius of curvature of 75b may be greater than or equal to the radius of the lower portion of the head 13 . That is, the first deformable part 20a, the second deformable part 20b, and the third deformable part 75b may satisfy at least one of Equations 1 to 3 below. In addition, the first deformable portion 20a, the second deformed portion 20b, and the third deformed portion 75b may satisfy all of Equations 1 to 3.

Here, R ₁ means the radius of curvature of the first deformed part, R ₂ means the radius of curvature of the second deformed part, and R ₃ means the radius of curvature of the third deformed part. R _a means the radius of the rod, R _b means the upper radius of curvature of the head part, and R _c means the lower radius of curvature of the head part.

That is, when R _{1 in} Equation 1 is greater than R _a , a free space is created in the first deformable portion 20a , so the function of holding the rod 30 is deteriorated, and the rod 30 is attached to the spine fixing screw 10 . ) can be deviated from. When R ₂ in _{Equation 2 is greater than R b} , the second deformable portion 20b may accommodate the entire upper portion of the head portion 13 , but gradually the head portion 13 due to the force of the accommodating member 75 being pressed to the side. ) As the upper space is created, the fixing force may be reduced because the rod 30 is pushed. When R _{3 in} Equation 3 is smaller than R _c , since the third deformable part 75b cannot accommodate the lower part of the head part 13 , the spine fixing screw 10 may be separated from the accommodating member 75 .

Accordingly, when the condition range of Equation 1 is satisfied, the first deformable portion 20a may surface-contact the lower portion of the rod 30 to increase adhesion and fixing force. In addition, when the condition ranges of Equations 2 and 3 are satisfied, each of the second deformable portion 20b and the third deformable portion 75b surface-contacts the upper and lower portions of the head portion 13, thereby accommodating the accommodating member 75 . The head portion 13 can be stably supported from the body portion 15 can have a continuous adhesion and fixing force even when the rotational movement. When specifically, R ₁ is 2.5 ~ 2.75mm, R ₂ is 2.55mm, R ₃ is 4.1mm, R _a is 2.75 ~ 3.mm, R _b is 3 ~ 3.9mm, and R _c is 3.9 ~ 4.1mm claim Point contact when the first deformation portion 20a and the rod 30, the second deformation portion 20b and the upper portion of the head portion 13, and the third deformation portion 75b and the lower curvature of the head portion 13 contact each other. It is possible to increase the stable and continuous bonding force and fixation force as the surface is contacted.

Referring to FIG. 4A , when the rod 50 presses the spinal fixation screw 10 while initially descending, the lower end of the rod 30 is in contact with both ends of the first deformable portion 20a of the pressure relay member 20 . In contact with the point, both ends of the pressure relay member 20 may also descend in the direction of the head portion 13 . In addition, the second deformable portion 20b of the pressure relay member 20 may be in contact with the upper end point of the head portion 13 , and the lower end of the head portion 13 is a locking groove 75c of the receiving member 75 ). can be tangent to one side of the This point contact can increase the temporary fixation force of the spinal fixation screw 10 .

Referring to FIG. 4B , the pressing force may be increased by the downward force of the rod 50 as the rod pressing member 50 is more strongly fastened than in FIG. 4A . At this time, the lower end of the rod 30 can be in contact with the overall surface as the first deformable portion 20a is deformed, and at the same time both ends of the pressure relay member 20 are also lowered in the direction of the head portion 13 while the pressure relay member ( The second deformable portion 20b of 20 ) may be in contact with the entire upper surface of the head portion 13 . In addition, the side and lower ends of the head portion 13 may be in contact with the overall surface of the third deformable portion 75b of the accommodating member 75 . Accordingly, the pressure relay member 20 has the first deformable portion 20a and the second deformable portion 20b, and the receiving member 75 has the third deformable portion 75b, thereby fixing the rod 30 and the spine. By relaying the pressure between the screws 10, it is possible to evenly distribute the pressure and maintain a continuous fixing force.

Referring to Figure 5 (a), any one of the pressing relay member 20 and the receiving member 75 is further provided with a locking portion 20c, the other one can be further formed with a locking groove (75c). . Accordingly, the spinal fixation screw 10 can prevent the locking portion 20c from being separated from the locking groove 75c.

Referring to (b) of FIG. 5 , inside the pressure relay member 20 , the second deformable portion 20b may be formed so that both sides thereof are symmetrical. The second deformable portion 20b may further form a spare groove portion 20d therebetween. The spare groove portion 20d may serve as an extra space to further fix the head portion 13 by deforming the second deformable portion 20b when the pressure relay member 20 is pressed by the rod 30 . have. That is, the spare groove portion 20d may have a gap of up to 3 mm in normal times, and the space between the rods 30 may be narrowed when the pressure is applied. On the other hand, the present invention is not limited thereto, and the second deformable portion 20b may be formed as a semicircular groove having the same center without the extra groove portion 20d.

6 is a partially enlarged cross-sectional view showing the main part of the spinal fixation device according to an embodiment of the present invention.

Referring to Figure 6, the guide member 70 according to the embodiment of the present invention has a cutting neck 71 that is formed to be depressed so as to separate and remove the guide member 70 from the receiving member 75 when cutting in the treatment step. may include The cut neck portion 71 may have an outer peripheral cut groove 71a formed on the outer periphery, and an inner peripheral cut groove 71b may be formed on the inner periphery. The inner circumferential cut groove 71b is positioned to face the outer circumferential cut groove 71a horizontally, and a groove is formed thinner than the outer circumferential cut groove so that the cut surface is cut without leaving the remainder of the receiving member 75 or the guide member 70 when cutting. It can be kept horizontal. Accordingly, since the fracture surface of the cut neck 71 is horizontal, damage to internal tissues of the body can be prevented, and physical activity can be freely performed in daily life because it does not protrude like an accessory bone on the patient's skin after the procedure.

7 is a partially enlarged cross-sectional view illustrating a modified example of FIG. 6 .

Referring to FIG. 7 , the spinal fixation device according to another embodiment of the present invention may further include a receiving member 75 having a protective film 73 on the surface of the cut neck 71 . A protective film 73 may be formed on at least one of an inner periphery and an outer periphery of the cut neck portion 71 . In addition, a portion of the protective film 73 may remain on the receiving member 75 remaining while the guide member 70 is removed by the cut neck portion 71 . Accordingly, the protective film 73 may prevent fragments from being generated during cutting, and may prevent damage to internal tissues of the body due to the fracture surface of the cut neck 71 . The protective film 73 may be formed on the inner and outer periphery surfaces of the cut neck 71 and made of silicon, a material harmless to the human body that serves as a lubricant.

8 is a side view (a) and a cross-sectional view (b) showing the front of the fixing ring of the spinal fixation device according to an embodiment of the present invention, and FIG. 9a is a plan view (a) and a front view showing the fixing ring of FIG. It is a cross-sectional view (b) shown, and FIG. 9B is a plan view showing a modified example of FIG. 9A.

8 to 9b, the fixing ring 100 of the spinal fixation device 10 according to an embodiment of the present invention includes a ring body 110, a holding part 110b, a ring groove 110a and a seating part 110c. ) may be included. The fixing ring 100 surrounds the first guide member 70a and the second guide member 70b and may be positioned on one side thereof. When the guide member 70 is inserted into the spine 1, it may be horizontally distorted or shaken by the force applied. Therefore, the fixing ring 100 can be fixed while maintaining the level of the guide member 70, preventing shaking, and performing the procedure. In particular, the fixing ring 100 may be located approximately 40 to 50 mm from the upper ends of the first guide member 70a and the second guide member 70b. When positioned in such a range, the fixing ring 100 is fixed while the first guide member 70a and the second guide member 70b are stably horizontally maintained to each other, thereby making the operation easier.

The ring body 110 may be made of an elastic material and may have a penetrating hole therein, and may be fixedly supported during installation by penetrating the guide member 70 .

Referring to FIG. 9A , the ring groove 110a may be positioned on the ring body 110 and formed between the first guide member 70a and the second guide member 70b. Before the rod 30 is installed on the guide member 70, the ring groove 110a confirms that the positional relationship such as the arrangement and angle of the spinal fixation screw 10 with respect to the spine 1, that is, the alignment is correct. It may serve to position the rod 30 to do so. The holding part 110b is formed on at least one side of the ring body 110 and may be provided to hold the ring body 110 when worn or separated from the spine 1 . The holding part 110b is positioned on both sides of the ring body 110 and may be formed as a circular protrusion so that the operator can easily hold it when inserting the spinal fixation device 10 . The present invention is not limited thereto, and may be variously formed in a shape that is easy for the operator to grasp during the operation. The seating portion 110c may be further formed in the ring body 110 so that the guide members 70 facing each other are positioned inside the hole of the ring body 110 and are seated and fixed in the hole. In particular, the seating portion 110c may be formed at the corners of four points where the first guide member 70a and the second guide member 70b contact each other. Accordingly, the seating portion 110c may be caulked after seating the first guide member 70a and the second guide member 70b to prevent separation and fixation. On the other hand, the fixing ring 100 may help the spinal fixation device 10 to be accurately inserted into the position of the spine 1 to be operated during the operation, but may be separated and removed together with the guide member 70 after insertion.

Referring to FIG. 9B , the ring body 110 according to the modified example may further form an insertion guide part 110d. The insertion guide portion 110d is located in the ring groove 110a and forms an inner groove of the ring body 110, for example, insertion of a device for fastening the spinal fixation screw 10, for example, a driver (not shown). can guide you. Inserting the guide portion (110d) has a radius of curvature R _d R _d is It may be smaller than the radius of the hole through the ring body 110, R _e. In detail, R _d may have a range of about 0.1 to 0.9 mm compared to Re _e. Therefore, when having the above range, the ring body 110 can guide the insertion of an instrument for fastening the spine fixing screw 10 while fixing and supporting the guide member 70 .

10 is a cross-sectional view and a partially enlarged view illustrating a state in which a rod is connected and installed to each of two guide members and a spinal fixation screw as a spinal fixation device according to another embodiment of the present invention.

Referring to FIG. 10 , in the spinal fixation device according to another embodiment of the present invention, the rod 30 may be connected and installed to each of the two guide members 70 and the spinal fixation screw 10 . The members other than the rod 300 have the same reference numerals already mentioned in FIGS. 1 to 9B and perform the same functions and roles, and thus redundant descriptions will be omitted. The rod 300 may further have at least one rod groove portion 300a formed therein. When the rod 300 is installed, a groove may be formed to accommodate the pressure relay member 20 , and may have various shapes such as a semicircle, an oval, and a square. The rod groove portion 300a receives at least one end of the pressure relay member 20 and does not slip when the rod 300 is seated, and is secondarily fixed once more to improve the fixing force of the rod 300 with respect to the guide member 70 . can

The above-described embodiments are merely exemplary, and various modifications and equivalent other embodiments are possible by those of ordinary skill in the art to which the present invention pertains. Therefore, the true technical protection scope of the present invention will have to be determined by the technical idea of the invention described in the claims.

1: vertebra 5: spinal cord
10: spine fixing screw 13: head portion
15: body portion 15a: insertion hole
15b: injection hole 20: pressurized relay member
20a: first deformed portion 20b: second deformed portion
20c: locking part 20d: spare groove part
30: rod 50: rod pressing member
70: guide member 70a: first guide member
70b: second guide member 71: cut neck
71a: outer peripheral cut groove 71b: inner peripheral cut groove
73: protective film 75: receiving member
75a: through hole 75b: third deformation part
75c: locking groove 75d: movable guide groove
100: fixing ring 110: ring body
110a: ring groove 110b: holding part
110c: rod seating part 110d: insertion guide part
300: rod 300a: rod groove
I: injector C: bone cement

Claims (9)

In the spinal fixation device having a rod for mutually fixing the spine,
a spinal fixation screw which is inserted and fastened to the spine, the body part having a screw thread formed therein, and a head part formed at one end of the body part;
a receiving member in which the spinal fixation screw is installed therein, a through hole through which the body part passes is formed in the inner center, and the head part is installed on the through hole;
a rod pressing member which is installed in the receiving member so as to be elevating and is positioned on the rod to apply pressure to the rod in the direction of the spinal fixation screw;
a pressing relay member positioned between the head and the rod in the receiving member and having an upper surface pressed by the rod and a lower surface pressing the head; and
and a guide member formed integrally with the receiving member to guide the rod installation,
The pressure relay member,
a first deforming part formed in the center of the upper surface to allow the outer periphery of the pressing relay member to be deformed in the direction of the head while the rod is pressed in close contact with the entire lower end of the rod; and
It is formed on the lower surface and is formed on one side at a maximum interval of 3 mm, and further comprises a second deformable portion adapted to be in close contact with the entire upper end of the head portion when the outer periphery of the pressure relay member is deformed,
The receiving member is
It is formed on the inner side that is connected to the through hole, the head part is installed and further includes a third deformable part that is deformed while being in close contact with the entire lower end of the head part when the rod is pressed,
The radius of curvature of the first deformable part is less than or equal to the radius of the rod, the curvature radius of the second deformable part is less than or equal to the upper radius of the head part, and the curvature radius of the third deformable part is smaller than the lower radius of the head part. greater than or equal to,
Located between the guide member and the accommodating member, a recessed cutting neck is formed to separate and remove the guide member from the accommodating member when cutting in the operation step,
The cut neck portion,
A spinal fixation device, characterized in that an outer peripheral cutting groove is formed on the outer periphery, the inner peripheral cutting groove is formed on the inner periphery to face the outer peripheral cutting groove horizontally, and the inner peripheral cutting groove is formed thinner than the outer peripheral cutting groove. delete delete According to claim 1,
Each of the first deformable portion, the second deformable portion and the third deformable portion,
A spinal fixation device, characterized in that it satisfies at least one of the following Conditional Expressions 1 to 3.
<Condition 1>

<Condition 2>

<Condition 3>

Here, R ₁ denotes a radius of curvature of the first deformable part, R ₂ denotes a curvature radius of the second deformable part, and R ₃ denotes a curvature radius of the third deformable part. R _a means a radius of the rod, R _b means an upper radius of the head part, and R _c means a lower radius of the head part. According to claim 1,
One of the pressing relay member and the accommodating member is further provided with a locking part, and a locking groove is further formed on the other one,
Spinal fixation device, characterized in that the locking portion is not separated from the locking groove. delete According to claim 1,
The spine, characterized in that it further comprises a protective film formed on at least one of the inner periphery and the outer periphery of the cut neck to prevent fragments from being generated during cutting, and to prevent tissue damage caused by the fractured surface of the cut neck. fixture. 8. The method of any one of claims 1, 4, 5 and 7,
The guide member,
and a second guide member positioned to face each other with the first guide member,
The spinal fixation device further comprising a fixing ring surrounding the first guide member and the second guide member and positioned on one side of the fixing ring to maintain a level and prevent shaking when the guide member is inserted into the spine. 9. The method of claim 8,
The fixing ring is
a ring body having a hole through it;
a holding part formed on at least one side of the ring body and provided to hold the ring body when worn or separated from the spine;
a ring groove positioned on the ring body and formed between the first guide member and the second guide member; and
Spinal fixation device, characterized in that it includes a seating portion positioned inside the ring body hole and having a groove formed so that the guide members facing each other are seated and fixed in the hole.

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