KR101047938B1 - pedicle screw - Google Patents

pedicle screw Download PDF

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Publication number
KR101047938B1
KR101047938B1 KR1020090060579A KR20090060579A KR101047938B1 KR 101047938 B1 KR101047938 B1 KR 101047938B1 KR 1020090060579 A KR1020090060579 A KR 1020090060579A KR 20090060579 A KR20090060579 A KR 20090060579A KR 101047938 B1 KR101047938 B1 KR 101047938B1
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South Korea
Prior art keywords
portion
formed
pedicle screw
bolt
head
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KR1020090060579A
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Korean (ko)
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KR20110003005A (en
Inventor
김서곤
김일
임동수
최종면
하지형
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주식회사 솔고 바이오메디칼
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Priority to KR1020090060579A priority Critical patent/KR101047938B1/en
Publication of KR20110003005A publication Critical patent/KR20110003005A/en
Application granted granted Critical
Publication of KR101047938B1 publication Critical patent/KR101047938B1/en

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Abstract

The present invention, in the mono-type pedicle screw for fixing the rod seated in the mounting groove of the head by screwing with the fixing member, a male thread is formed on the outer peripheral surface to be inserted into the bone and the diameter of the male thread is extended to the upper side A bolt portion having a stepped portion formed integrally with a mounting groove formed on an upper surface of the stepped portion in contact with the rod; And a head portion having an opening hole formed at a lower end thereof to allow the male thread to pass therethrough, the head portion having a lock chamber accommodating the step portion of the bolt portion therein, wherein the bolt portion and the head portion are fastened by being accommodated in the lock chamber. The rod placed in the mounting groove is characterized in that it is fixed in close contact with the mounting groove according to the screwing of the fixing member.
The pedicle screw according to the preferred embodiment of the present invention is manufactured by dividing the bolt portion and the head portion and pressing the elastic portion so that the elastic deformation occurs, and thus the manufacturing time is not only shortened but also easier to manufacture and manufacture. Cutting chips can be minimized. In addition, inclined surfaces are formed at portions where the stepped portions and the locking ribs abut each other, thereby minimizing deformation or friction of the portions in contact with each other.
Bolt part, head part, step part

Description

Pedicle Screws {PEDICLE SCREW}

The present invention relates to a pedicle screw, commonly referred to as a pedicle screw, and more particularly to a pedicle screw of the monotype (integral type: the head portion and the screw is formed so as not to rotate).

In the treatment of diseases related to the spine, indirect treatment methods through physical therapy and direct treatment methods for correcting and fixing the spine are usually performed by attaching a separate fixing device to the damaged vertebrae.

Among them, spinal fixation devices such as pedicle screws are generally used as a direct treatment method for physically correcting a damaged spine.

The pedicle screw 100 is composed of a head portion coupled to fix the rod 300 and the fixing member 200, as shown in Figure 1; and a bolt portion extending from the head portion inserted into the spine; And bolts are divided into two types according to their separability.

That is, the mono-type which is integrally formed and impossible to separate the head part and the bolt part and the individual movement is not possible, and the head part and the bolt part are moved separately until the head part and the bolt part are separated and fixed according to the position to be treated. This is divided into possible polytypes.

Of these, the conventional monotype pedicle screw is processed by cutting in one raw material without separately processing the head portion and the bolt portion as shown in FIG. As shown in FIG. 2, a large part of the raw material was thrown away by the cutting chip (hatched portion in the right figure).

 The pedicle screw used in the human body is mainly made of high biocompatibility pure titanium, titanium alloy or stainless steel, and titanium and stainless steel are expensive. Therefore, since the share of raw material costs in production costs is significant, the need for solving such problems is very urgent.

In order to solve this problem, the applicant has filed a patent application of 'vertebral fixing device and its manufacturing method' (Patent Application No. 10-2008-23925) to 2008.3.14, and after separating and processing the head part and the bolt part The new concept of combining monotype pedicle screws is constantly being improved and developed.

The present invention has been developed to solve the above problems, it is easy to manufacture, the productivity is high, the head portion and the bolt portion can be tightened more easily and easily, the greater the torsion generated between the bolt portion and the head portion It is a main object to provide a monotype pedicle screw with durability.

The present invention for achieving the object as described above, in the mono-type pedicle screw for fixing the rod seated in the mounting groove of the head by screwing the fixing member, the male thread is formed on the outer peripheral surface to be inserted into the bone A bolt part integrally formed with a stepped portion having a diameter extending above the male thread; And a head portion having an opening hole formed at a lower end thereof to allow the male thread to pass therethrough, the head portion having a lock chamber accommodating the step portion of the bolt portion therein, wherein the bolt portion and the head portion are fastened by being accommodated in the lock chamber. The rod placed in the mounting groove is pressed by the upper side of the step portion in accordance with the screwing of the fixing member is characterized in that the rod is fixed in close contact with the bolt portion.

A seating groove is formed on an upper surface of the stepped portion, and the rod is seated and fixed in a state in which the seating groove is aligned with the mounting groove.

The head portion has a locking rib having an inner diameter smaller than the outer diameter of the stepped portion is formed on the inner circumferential surface to the upper side of the opening hole, and accommodates the stepped portion between the locking rib and the opening hole, and the stepped portion passes through the locking rib and fits into the lock chamber. When accommodated as, the inner diameter of the locking rib is elastically expanded.

A portion in which the locking ribs and the stepped portion come into contact with each other is formed with a tapered inclined surface or rounded to facilitate fastening. A plurality of fixing protrusions are formed at the lower end of the stepped portion, and when the bolt portion and the head portion are fastened, the fixing protrusions are pressed against the inner circumferential surface of the opening hole and deformed, and the fixing force is applied to the bolt portion and the head portion according to the stress generated at the contact surface. Add.

Preferably, the fixing protrusions are formed along a longitudinal direction of the bolt portion, and tapered inclined surfaces are formed or rounded at one end of the fixing protrusion and the end of the opening hole, which are in contact with each other.

In addition, the pedicle screw, characterized in that the friction member in the form of a liquid or gel is applied to the inside of the lock chamber and the opening hole.

The pedicle screw according to the preferred embodiment of the present invention is manufactured by dividing the bolt portion and the head portion as shown in FIG. 3 and pressurized to produce an elastic deformation, thereby shortening the manufacturing time. But it is easier to manufacture and has the effect of minimizing the cutting chips during manufacturing. In addition, inclined surfaces are formed at portions where the stepped portions and the locking ribs abut each other, thereby minimizing deformation or friction of the portions in contact with each other.

In addition, since the rod is fixed while pressing the bolt portion when the rod is fastened, there is an effect of further reducing the damage and deformation due to the torsion generated between the bolt portion and the head portion.

In addition, a fixing protrusion is formed in the bolt portion, and the fixing protrusion is permanently deformed and fixed in the head portion, thereby further increasing the tightening force of the bolt portion and the head portion. Since the contact area of the head portion and the bolt portion is increased accordingly, there is an effect of preventing the slide from the bolt portion during the rotation of the head portion. In addition, by tightening the stepped portion in the state in which the friction member is applied to the inner peripheral surface of the lock chamber and the opening hole can further increase the above effects.

In addition, an inclined surface is formed at the end of the fixing protrusion so that the head portion can be easily deformed and fastened.

Hereinafter, with reference to the drawings will be described in more detail a monotype pedicle screw 100 according to a preferred embodiment of the present invention.

As described above, the present invention is fastened so that the manufactured head portion 10 and the bolt portion 20 are fixed, and as shown in FIG. 4, the head portion 10 is lowered from the upper side of the bolt portion 20. It is configured to be inserted into and fixed.

FIG. 5 is a front view of the bolt portion 20 according to the preferred embodiment of the present invention, and FIGS. 6A and 6B are cross-sectional views of B-B and C-C of FIG. 5, respectively. As shown, the bolt portion 20 of the present invention is formed with a male thread 21 on the outer circumferential surface by a predetermined height from the lower side to be inserted into the bone of the human body, the outer diameter of the male thread 21 to the upper side A stepped portion 22 is formed which expands further to increase. A fixing protrusion 23 is formed on the outer circumferential surface of the lower portion of the stepped portion 22 along the longitudinal direction of the bolt portion 20. In addition, the upper surface of the step portion 22, as shown in Figure 4, a wrench groove (27) is formed so that a surgical wrench (not shown, a wrench) can be fitted, the rod over the wrench groove (27) A seating groove 26 is formed so that the 300 is seated. The seating groove 26 is preferably formed to be in close contact when the rod 300 is mounted. Therefore, it can be formed with various curvatures according to the diameter of the rod.

In addition, the bolt portion 20 has a different outer diameter at each portion to be fastened at a designated portion inside the head portion 10. As shown, the diameter of the portion where the male thread 21 is formed, the portion where the fixing protrusion 23 is formed, and the portion where the stepped portion 22 is formed is gradually increased, and the lower end of the stepped portion 22 and The tapered or rounded inclined surfaces 24 and 25 are formed at the lower end of the fixing protrusion 23 so that the diameter thereof becomes smaller. In addition, as shown in Figure 6b, in order to prevent the accumulation of mechanical stress to one side when fastening with the head portion 10, the fixing projections 23 are formed densely continuously over the entire circumference of the outer peripheral surface of the screw portion 21 It is desirable to be.

On the other hand, the fixing protrusion 23 is shown in the form of a thread vertically erect in the drawing, but each end is agglomerated by the pressing force, so that the thread shape is processed to be manufactured to form a knurling in the horizontal or inclined state It's okay.

FIG. 7 is a cross-sectional view of A-A of FIG. 4. Head portion 10 of the present invention, like the conventional pedicle screw through the rod 300 to form a "U" shaped mounting groove 16 to be fixed to the fixing member 200 is formed and the upper inner peripheral surface In the outer peripheral surface is formed a female thread 17 to be engaged with it so that the fixing member 200 is formed with a screw thread is coupled.

As shown in Figure 4, the head portion 10 of the present invention is opened in the upper and lower openings 13 are formed in the lower portion so that the bolt portion 20 can be fitted. In addition, a locking rib 11 is formed on an inner circumferential surface of the upper side at a predetermined distance from the opening hole 13 so that the stepped part 22 is fixed and accommodated between the locking rib 11 and the opening hole 13. The lock chamber 12 can be formed. The locking rib 11 forming the lock chamber 12 has a seating groove 26 of the stepped portion 22 disposed at a lower end of the mounting groove 16 so that the rod 300 can be seated therein. It is formed above the bottom.

On the other hand, the lock chamber 12 and the opening hole 13 is divided by the boundary at which the step (difference in the inner diameter) is formed so that the step portion 22 does not escape to the opening hole (13). Therefore, the inner diameter of the opening hole 13 has a size larger than the outer diameter of the portion in which the male thread of the thread portion 21 is formed and smaller than the maximum outer diameter of the portion in which the fixing protrusion 23 is formed. However, when the head portion 10 and the bolt portion 20 are fastened, the end portion of the fixing protrusion 23 is agglomerated and deformed so that the fixing protrusion 23 can be fitted in contact with the inner circumferential surface of the opening hole 13. It is preferable that the inner diameter of the opening hole 13 is formed to be about 0.02 to 1.5 mm smaller than the maximum outer diameter of the formed portion.

As shown in the enlarged portion of FIG. 7, the locking rib 11 formed on the inner circumferential surface of the head portion 10 has an inclined surface 14 (either tapered or rounded) formed at an upper end thereof so as to have a stepped portion 22. The inner diameter can be expanded more easily when pressed against the inclined surface 24 of the). Therefore, the locking rib 11 is preferably formed in a ring shape along the inner circumferential surface of the head portion 10 so as to be elastically restored after the passage of the stepped portion 22.

And, as described above, the lock chamber 12 is a space formed between the locking rib 11 and the opening hole 13, is formed in a size that can accommodate the shape and volume of the step portion 22, Step between the opening hole 13 and the step so that the fixing protrusion 23 is easily deformed into a shape that can be inserted into the opening hole 13 in the portion in contact with the inclined surface 25 formed on the fixing protrusion 23 of the bolt portion 20. In the portion formed, the inclined surface 15 (either tapered or rounded) is formed.

Therefore, similarly to the bolt portion 20, the inner diameter of the head portion 10 also has a shape that gradually narrows down to a shape stepped from the upper side to the lower side. That is, around the locking rib 11, the upper side of the locking rib 11 has an inner diameter through which the stepped portion 22 can enter and exit, and the locking chamber 12 below the locking rib 11 has a locking rib and an error range of 0.02. It is configured to have the same inner diameter to within 0.1 mm (based on titanium alloy material).

Hereinafter, a state in which the head portion 10 and the bolt portion 20 are coupled with reference to the drawings will be described in more detail with reference to the drawings.

As described above, the bolt portion 20 of the present invention is inserted above the head portion 10. That is, the bolt portion 20 and the head portion 10, the inclined surface 24 formed on the lower end of the stepped portion 22 is in contact with the inclined surface 14 formed on the upper end 14 of the locking rib 11 or In the state in which the inclined surface 25 of the fixing protrusion 23 and the inclined surface 25 formed at the portion partitioning the locking chamber 12 and the opening hole 13 abut, the mounting groove so that the rod is mounted in close contact with the seating groove After the seating grooves are aligned and the position of the head part 10 is fixed, the upper side of the bolt part 20 is pressed down and fastened by a strong pressure by a press device or the like.

When the bolt portion 20 is inserted as described above, the inner diameter of the portion where the locking rib 11 is formed is elastically expanded according to the movement of the step portion 22, and the step portion 22 passes through the locking rib 11 as shown in FIG. 8A. ) Is entirely accommodated in the lock chamber 12, and at the same time, the fixing projection 23 is modified as shown in Figure 8b is inserted into the opening hole (13).

As shown in Figure 8a, the pedicle screw of the present invention manufactured by the fastening of the bolt portion and the head portion, the rod is fixed by the fixing member in a state seated in the mounting groove and the mounting groove. Therefore, the pressure applied to the rod is distributed not only to the head portion but also to the bolt portion that is in direct contact, and can support a higher pressure torsion in comparison with a conventional pedicle screw.

9 is a test apparatus according to the rotation angle of the rod by fixing the bolt portion and rotating the rod in one direction while the rod is fastened to the head portion of the pedicle screw by the fixing member (MTS 858 Table Top System, MTS system Corp. , MN, USA) is a picture taken to measure the torque (Nm) generated.

The experimental results are shown in Figure 10, the conventional monotype pedicle screw of the conventional general type is shown in blue and other monotype pedicle screw in the present invention is shown in green.

The conventional pedicle screw is increased up to 30 degrees rotation, the maximum torque of the torsion was 32 Nm or less, and was broken after rotation to around 43 degrees. On the other hand, the pedicle screw of the present invention was able to rotate without breaking up to 100 degrees or more, and the maximum torque of the torsion was 36 to 39 N · m. In the case of the conventional pedicle screw, the head part and the bolt part are processed integrally, so that the fracture occurs after deformation due to the twist between the head part and the bolt part, whereas the pedicle screw of the present invention is divided into the head part and the bolt part, and thus the torsion is dispersed. It does not reach breaking and has greater support.

On the other hand, when the bolt portion 20 is inserted, a predetermined lubricant may be applied to each contact surface as necessary so that unintentional breakage does not occur at the contact portion, and prevents or deforms unnecessary spaces in the lock chamber. In order to minimize the space between the fixed fixing projections 23, a friction member (not shown) having a high viscosity liquid or gel is first applied to the inner circumferential surfaces of the lock chamber 12 and the opening hole 13, and then the head portion ( 10) and the bolt 20 may be fastened.

Embodiments of the present invention disclosed in the specification and drawings are only presented as specific examples for clarity and are not intended to limit the scope of the invention.

In addition to the embodiments disclosed herein, it is apparent to those skilled in the art that other modifications based on the technical idea of the present invention may be implemented.

1 is a perspective view showing a state in which the pedicle screw is fastened to the rod and the fixing member according to an embodiment of the present invention,

2 is a flow chart showing a state in which a conventional pedicle screw is processed,

3 is a flow chart showing a state in which the pedicle screw of the present invention is processed,

Figure 4 is a perspective view showing a state before the bolt portion and the head portion of the pedicle screw according to the preferred embodiment of the present invention,

5 is a front view of the bolt portion according to a preferred embodiment of the present invention of the present invention,

6A is a cross-sectional view of the B-B plane of FIG. 5;

6B is a cross-sectional view of the C-C plane of FIG. 5;

7 is a cross-sectional view of the A-A plane of FIG.

8A is a cross-sectional view showing a state in which a rod and a fixing member are fastened to a pedicle screw according to a preferred embodiment of the present invention;

FIG. 8B is a sectional view of the D-D plane of FIG. 8A; FIG.

9 is a photograph showing a torsion test state of the pedicle screw according to the present invention,

10 is a graph showing a torsion test result.

** Description of the symbols for the main parts of the drawings **

10: bolt portion 11: locked rib

12: lock room 13: opening hall

20: head portion 22: stepped portion

Claims (8)

  1. In the pedicle screw of the mono type for fixing the rod seated in the mounting groove of the head by screwing with the fixing member,
    A male thread formed on an outer circumferential surface of the male thread to be inserted into the bone, and a bolt part integrally formed with a stepped portion having an enlarged diameter upwardly; And
    An opening hole formed at a lower end of the male thread to pass therethrough, and a head part formed therein with a lock chamber in which the stepped part of the bolt is accommodated;
    The bolt portion and the head portion are fastened by receiving the stepped portion in the lock chamber, and the rod placed in the mounting groove presses the upper side of the stepped portion according to the screwing of the fixing member so that the rod is fixed to the bolt portion. Features pedicle screw.
  2. The pedicle screw according to claim 1, wherein a seating groove is formed on an upper surface of the stepped portion, and the rod is seated and fixed in a state in which the seating groove is aligned with the mounting groove.
  3. 3. The method of claim 2, wherein the head portion has a locking rib having an inner diameter smaller than the outer diameter of the stepped portion is formed on the inner circumferential surface above the opening hole, and accommodates the stepped portion between the locking rib and the opening hole,
    The stepped portion of the pedicle screw, characterized in that the inner diameter of the locking rib is elastically expanded when the passage is received in the lock chamber through the locking rib.
  4. 4. The pedicle screw according to claim 3, wherein the locking ribs and the stepped portions are respectively tapered or rounded.
  5. According to any one of claims 2 to 4, A plurality of fixing projections are formed at the lower end of the stepped portion,
    The fastening protrusion is pressed against the inner circumferential surface of the opening hole when the bolt portion and the head portion is fastened, the pedicle screw, characterized in that to increase the fixing force of the bolt portion and the head portion in accordance with the stress generated in the contact surface.
  6. 6. The pedicle screw according to claim 5, wherein the fixing protrusion is formed along a longitudinal direction of the bolt portion.
  7. 7. The pedicle screw according to claim 6, wherein a tapered inclined surface is formed or rounded at one end of the fixing protrusion and the end of the opening hole which are in contact with each other.
  8. The pedicle screw according to claim 5, wherein a friction member in the form of a liquid or a gel is applied to the lock chamber and the opening hole.
KR1020090060579A 2009-07-03 2009-07-03 pedicle screw KR101047938B1 (en)

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KR1020090060579A KR101047938B1 (en) 2009-07-03 2009-07-03 pedicle screw

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1332722A1 (en) * 1997-06-16 2003-08-06 Stryker Trauma GmbH A receiving part for a retaining component of a vertebral column implant
KR20060043308A (en) * 2004-03-03 2006-05-15 비이더만 모테크 게엠베하 Anchoring element and stabilization device for the dynamic stabilization of vertebrae or bones using such anchoring elements
KR20070008391A (en) * 2005-07-12 2007-01-17 비이더만 모테크 게엠베하 Bone anchoring device
KR20080037609A (en) * 2005-04-25 2008-04-30 신세스 게엠바하 Bone anchor with locking cap and method of spinal fixation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1332722A1 (en) * 1997-06-16 2003-08-06 Stryker Trauma GmbH A receiving part for a retaining component of a vertebral column implant
KR20060043308A (en) * 2004-03-03 2006-05-15 비이더만 모테크 게엠베하 Anchoring element and stabilization device for the dynamic stabilization of vertebrae or bones using such anchoring elements
KR20080037609A (en) * 2005-04-25 2008-04-30 신세스 게엠바하 Bone anchor with locking cap and method of spinal fixation
KR20070008391A (en) * 2005-07-12 2007-01-17 비이더만 모테크 게엠베하 Bone anchoring device

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