KR101047936B1 - pedicle screw - Google Patents

pedicle screw Download PDF

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Publication number
KR101047936B1
KR101047936B1 KR1020090060577A KR20090060577A KR101047936B1 KR 101047936 B1 KR101047936 B1 KR 101047936B1 KR 1020090060577 A KR1020090060577 A KR 1020090060577A KR 20090060577 A KR20090060577 A KR 20090060577A KR 101047936 B1 KR101047936 B1 KR 101047936B1
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KR
South Korea
Prior art keywords
portion
formed
bolt
pedicle screw
head
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Application number
KR1020090060577A
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Korean (ko)
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KR20110003003A (en
Inventor
김서곤
김일
임동수
최종면
하지형
Original Assignee
주식회사 솔고 바이오메디칼
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Priority to KR1020090060577A priority Critical patent/KR101047936B1/en
Publication of KR20110003003A publication Critical patent/KR20110003003A/en
Application granted granted Critical
Publication of KR101047936B1 publication Critical patent/KR101047936B1/en

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Abstract

The present invention provides a mono type pedicle screw, comprising: a screw part having a male thread formed on an outer circumferential surface thereof, and a bolt part integrally extending from an upper end of the screw part to expand a diameter step; And an opening hole formed at a lower end thereof so that the screw portion passes therethrough, and a locking rib having an inner diameter smaller than the outer diameter of the stepped portion is formed on an inner circumferential surface thereof, and a lock chamber accommodating the stepped portion between the locking rib and the opening hole. And a head portion formed therein, wherein the bolt portion and the head portion are fastened by an interference fit so that the inner diameter of the locking rib is elastically expanded when the stepped portion is received in the lock chamber through the locking rib.
The pedicle screw of the present invention is manufactured by dividing the bolt portion and the head portion and pressurized to generate an elastic deformation so that the pedicle screw is fastened by interference fit, thereby making it easier to manufacture and minimizing cutting chips during manufacturing.
Bolt part, head part, pedicle screw

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 was developed to solve the above problems, the main object is to provide a mono-type pedicle screw that is easy to manufacture, high productivity, more robust and easy to the head portion and bolt portion.

The present invention for achieving the object as described above, in the mono-type pedicle screw, a screw portion formed with a male thread on the outer circumferential surface and a bolt portion formed by extending the upper end of the screw portion to a predetermined length; And a head portion having an opening hole formed at a lower end thereof so that the screw portion passes therethrough, and a head portion formed therein with a lock chamber accommodating an upper end of the bolt portion. The part and the head is characterized in that the permanent fastening.

In a preferred embodiment, the bolt portion includes a stepped portion having an enlarged diameter at an upper side of the screw portion, and the head portion is formed with a locking rib having an inner diameter smaller than the outer diameter of the stepped portion on an inner circumferential surface thereof so that the lock chamber is locked. The inner diameter of the locking rib is elastically expanded when the step portion is received between the rib and the opening hole, and the step portion is received in the lock chamber through the locking rib.

Then, tapered inclined surfaces are respectively formed at portions in contact with the locking ribs and the stepped portions.

In addition, a plurality of fixing protrusions are formed along the longitudinal direction of the bolt portion between the lower end of the step portion, that is, the male thread formed on the step portion and the screw portion, and when the bolt portion and the head portion are fastened, the fixing protrusion is an inner circumferential surface of the opening hole. It is pressed against and deformed.

In addition, tapered inclined surfaces are formed at one end of the fixing protrusion and the end of the opening hole which are in contact with each other.

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, 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, the bolt portion 20 and the head portion 10 according to a preferred embodiment of the present invention with reference to the drawings to be described in more detail.

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

5A is a front view of the bolt portion 20 according to the present invention, and FIGS. 5B and 5C are cross-sectional views of B-B and C-C of FIG. 5A, respectively. The bolt portion 20 of the present invention, as shown in Figure 5a and 5b, the screw portion 21 and the upper portion of the screw portion 21 is a portion formed with a male thread on the outer peripheral surface from the bottom to the upper side to be inserted into the bone of the human body It is formed integrally at the end and is made of a stepped portion 22 which is more extended to increase the outer diameter, the outer peripheral surface along the longitudinal direction (longitude) of the bolt portion 20 in a predetermined section below the bottom of the stepped portion 22 The fixing protrusion 23 is formed. The fixing protrusion 23 is shown in the form of a thread vertically erect in the drawing, but each end is agglomerated by a pressing force, so that the thread shape may be processed to form a knurling in a horizontal or inclined state. .

The bolt portion 20 has a different diameter in each portion to be fastened at a designated position of the head portion 10, as shown, the portion formed with a male thread and the stepped portion 22 and the portion where the fixing protrusions 23 are formed. ), The diameter of the formed portion is gradually increased, and tapered inclined surfaces 24 and 25 are formed at the end of the stepped portion 22 and the end of the fixing protrusion 23 so as to decrease in diameter. . In addition, as shown in Figure 5c, in order to prevent the mechanical stress to accumulate to one side when fastening with the head portion 10, the fixing projections 23 are formed densely continuously throughout the entire circumference of the outer peripheral surface of the screw portion 21 It is desirable to be.

6 is a cross-sectional view of A-A of FIG. 4. Head portion 10 of the present invention is a mounting groove of the "U" shape so as to be fixed to the fixing member (200 (see Figure 1) through the rod (300 (see Figure 1)) like the conventional pedicle screw This thread is formed and a female thread is formed at the upper end of the inner circumference.

However, as shown in Figure 4, the head portion 10 of the present invention is formed in the lower opening opening 13 is formed so that the bolt portion 20 is fitted is opened up and down. 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 lock chamber 12 and the opening hole 13 are divided by a boundary at which a step (difference in inner diameter) is formed so that the step portion 22 does not fall into 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 against the inner circumferential surface of the opening hole 13. It is preferable that the inner diameter of the opening hole is smaller than about 0.02 to 1.5 mm than the maximum outer diameter of the formed portion.

As shown in the enlarged portion of FIG. 6, the locking rib 11 formed on the inner circumferential surface of the head portion 10 has an inclined surface 14 formed at an upper end thereof to be in contact with the inclined surface 24 of the stepped portion 22. It is a structure that can expand the inner diameter more easily. In addition, 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, A portion stepped from the opening hole 13 so that the fixing protrusion 23 is deformed into a shape that can be inserted into the opening hole 13 in a portion in contact with the inclined surface 25 formed on the fixing protrusion 23 of the bolt portion 20. In the inclined surface 15 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 where the inclined surface 25 of the fixing projection 23 and the inclined surface 25 formed at the portion partitioning the lock chamber 12 and the opening hole 13 abut, the head portion 10 is fixed in position and the press device or the like. By the high pressure by pressing the upper side of the bolt portion 20 is fastened downward.

When the bolt portion 20 is inserted as described above, the inner diameter of the portion in which the locking rib 11 is formed is elastically expanded according to the movement of the stepped portion 22, and the inclined surface 24 passes through the locking rib 11 as illustrated in FIG. 7A. Including the formed portion, the entire stepped portion 22 is accommodated in the lock chamber 12, and at the same time, the fixing protrusion 23 is deformed as shown in FIG. 7B and inserted into the opening hole 13.

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 a conventional pedicle screw is used,

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,

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

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

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

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

7A is a cross-sectional view illustrating a state in which a head part and a bolt part are fastened according to a preferred embodiment of the present invention;

FIG. 7B is a sectional view of the D-D plane of FIG. 7A; FIG.

** 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 (7)

  1. In mono type pedicle screw,
    A bolt portion having a male thread formed on an outer circumference thereof and an upper end of the screw portion extending to a predetermined length; And
    An opening hole formed at a lower end of the screw unit to pass through the head, and a head part formed therein with a lock chamber in which an upper side of the bolt part is accommodated;
    The pedicle screw, characterized in that the upper side of the bolt portion is accommodated in the lock chamber by interference fit so that the bolt portion and the head portion is permanently fastened.
  2. The method of claim 1, wherein the bolt portion comprises a stepped portion extending in diameter on the upper side of the screw,
    The head portion has a locking rib having an inner diameter smaller than the outer diameter of the step portion is formed on the inner circumferential surface, the lock chamber accommodates the step portion between the locking rib and the opening hole,
    And the inner diameter of the locking rib is elastically expanded when the stepped portion is received in the lock chamber through the locking rib.
  3. 3. The pedicle screw according to claim 2, wherein a tapered inclined surface is formed at each of the locking ribs and the portion contacted with the stepped portion.
  4. According to claim 2 or 3, 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.
  5. 5. The pedicle screw according to claim 4, wherein the fixing protrusion is formed along a longitudinal direction of the bolt portion.
  6. 6. The pedicle screw according to claim 5, wherein tapered inclined surfaces are formed at one end of the fixing protrusion and the end of the opening hole which are in contact with each other.
  7. 5. The pedicle screw according to claim 4, wherein a friction member in the form of a liquid or a gel is applied to the lock chamber and the opening hole.
KR1020090060577A 2009-07-03 2009-07-03 pedicle screw KR101047936B1 (en)

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KR1020090060577A KR101047936B1 (en) 2009-07-03 2009-07-03 pedicle screw

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KR1020090060577A KR101047936B1 (en) 2009-07-03 2009-07-03 pedicle screw

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KR101047936B1 true KR101047936B1 (en) 2011-07-11

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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
KR20080031155A (en) * 2005-03-25 2008-04-08 블랙스톤 메디칼, 인크. Multi-axial connection system

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
KR20080031155A (en) * 2005-03-25 2008-04-08 블랙스톤 메디칼, 인크. Multi-axial connection system
KR20070008391A (en) * 2005-07-12 2007-01-17 비이더만 모테크 게엠베하 Bone anchoring device

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