JP2011067642A - Bone plate - Google Patents

Bone plate Download PDF

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JP2011067642A
JP2011067642A JP2010250329A JP2010250329A JP2011067642A JP 2011067642 A JP2011067642 A JP 2011067642A JP 2010250329 A JP2010250329 A JP 2010250329A JP 2010250329 A JP2010250329 A JP 2010250329A JP 2011067642 A JP2011067642 A JP 2011067642A
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plate
bone
bone plate
characterized
according
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JP2010250329A
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JP5275322B2 (en
Inventor
Rolf Schneider
シュナイダー、ロルフ
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Synthes Gmbh
ジンテーズ ゲゼルシャフト ミト ベシュレンクテル ハフツング
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a bone plate receivable to stabilize a conventional head lock screw relative to the angle and axis, without an additional constitutive component. <P>SOLUTION: The bone plate 1 includes a lower face 2 on a bone side, an upper face 8, and a plurality of plate holes 3 for coupling the lower face 2 to the upper face 8. The plate hole 3 includes a hole axis 5, and an inner surface area 4 tapered toward the lower face 2, and the inner surface area 4 includes three or more of recesses extended from the hole axis 5 radially outward. A thread of a head part of a head lock screw inserted into the plate hole 3 rides over a thread of the plate hole 3 interrupted by the recesses, by a diagonal attitude of the head lock screw, without overlapping with the thread of the plate hole 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bone plate according to the preamble of the first claim.

Such bone plates are suitable for adaptation in the whole skeleton. Of particular significance, however, are conventional large and small fractures for the indication of surgical fracture treatment.
A general bone plate is known from US Pat. The tilt angle of the bone screw relative to the bone plate and its angular stability is influenced by a ring arranged between the screw head and the plate hole in this known device. The disadvantages of this construction are, on the one hand, the expensive manufacturing with additional structural parts (rings), the risk that very small rings can be dropped or pushed out of the plate holes, which makes the device unusable, Since the ring needs to be arranged corresponding to the shaft before the screw is inserted, this is a troublesome surgical technique.

German Patent No. A-19832513

  In this respect, the present invention provides an improvement. It is an object of the present invention to provide a bone plate that can accept a conventional headlock screw to be stable with respect to angle and axis without additional structural components.

  The present invention solves the above problems with a bone plate having the features of claim 1.

The advantage achieved by the present invention is that the bone plate according to the present invention allows the bone screw to be inserted at an angle that deviates from a predetermined (usually orthogonal to the plate plane) hole axis and locked in this position. However, it is substantially confirmed that it does not lose much stability as is the case with known devices.
At least three recesses in the inner cover surface (inner surface area) of the plate hole provide centering support for the screw head even when the bone screw is tilted, thereby providing a uniform load distribution. In a plate hole with a bone screw and a female screw with a head screw, the head screw “jumps” over the thread interrupted by a dent in the plate hole—when the screw is tilted—but does not intersect it.
Another advantage of the bone plate according to the invention is that at least three recesses in the plate hole can be used for the guide of the drill or guide bush, by which the bone screw can be guided during insertion. In this case, the drill or guide bush does not need to be screwed into the plate hole—as in the prior art—it can be simply inserted into the plate hole by a recess, which makes it easy to center the hole axis And direction arises. Furthermore, the inserted drill or guide bush need only have a negative shape in the form of a plate hole at its tip, and does not require any screws or other similarly acting structures. If desired, a snap mechanism can also be coupled.

Further advantageous embodiments of the invention are characterized in the dependent claims.
In certain embodiments, the inner cover surface of the plate hole is provided with a three-dimensional structure. This helps guide the corresponding structured head screw. The three-dimensional structure is macroscopic and preferably consists of partial or complete threads, ribs or ridges. The inner cover surface can also support multiple threads.
In this case, the top shape of the N “hole ribs” formed by the N recesses is preferably formed so as to facilitate compatibility with the bone screw to be inserted. This can be a conventional helical screw shape, a screw shape with or without ridges, a certain number of grooves or ribs, or a quasi-screw with or without ridges. The number of grooves or ribs is preferably always an odd number (eg 3, 5, 7, or 9).
The inner cover surface may be configured to be concave, preferably spherical, conical or elliptical. This shape is automatically applied to the bone screw on its first contact with the inner cover surface of the bone screw without applying a compressive force to the bone in advance through the bone plate, as is partially relevant in prior art devices. It is advantageous for the penetration of the bone screw by being pulled into the plate hole.

In another embodiment, at least one of the plate holes is configured as a slot.
The N dents are arranged at an interval of 360 ° / N when viewed from the central axis. The recess preferably has a peripheral extension of at least 1 ° and at most 119 °. In this case, the recess divides the inner cover surface into N cover surface portions.
In certain embodiments, the recess is only in the area of the inner cover surface. In other embodiments, the recess extends radially from the hole axis to the range of the inner cover surface.
The recess may extend in a cylindrical or conical shape from the upper surface to the lower surface. Thereby, the advantage arises that the recess can be used for pre-drilling or inserting the drill bushing for Kirschner wire. Therefore, the drill bush does not need to be screwed into the plate hole, but only needs to be inserted, and in this case, the screw support portion is not damaged.

The recess can extend from the upper surface to the lower surface over the entire height of the bone plate.
The bone plate can also be made of copper or titanium or plastic. In the case of plastic plates, such bone plates are preferably made of polyacrylic ether ketone (PEAK) or polyether ether ketone (PEEK) having an elongation at break of 40-70% and an elastic module of 3000-6000 N / mm2. However, polysulfone having an elongation at break of 80-120% and an elastic module of 2000-3500 N / mm 2 can be used. Also suitable are liquid crystal polymers (LCP) having an elongation at break of 1.5-2.5% and an elastic module of 5000-20'000 N / mm2. Finally, polyoxymethylene (POM) with 10-50% elongation at break and 2000-3'500 N / mm2 elastic module, and 0.2-1.0% elongation at break and 12000-20'000 N / mm2 Polyphenylene sulfide (PPS) having the following elastic modules can also be used.

Various types of bone screws can be used with the bone plate. For example, such bone screws have a convex surface, preferably spherical or conical. The head of the bone screw can also have a three-dimensional structure. In a special embodiment, the head of the bone screw is made of a material that is harder than the inner cover surface of the bone plate. Preferably, the inner cover surface of the bone plate and the head of the bone screw have screws aligned with each other.
In plastic plates, the plate holes can also be configured as metal screw inserts. Conversely, in metal bone plates, the plate holes can be configured as polymer screw inserts.

It is a longitudinal cross-sectional view which shows the bone plate which has a conical plate hole. It is a longitudinal cross-sectional view which shows the bone plate which has a spherical plate hole. It is a figure which shows the bone plate which has three dents in the inner cover surface of a plate hole. Fig. 4 is a variant of the bone plate according to Fig. 3 with a stronger recess in the inner cover surface of the plate hole. FIG. 6 shows a bone plate having a screw insert with four recesses in a plate hole configured elliptically on the inner cover surface. FIG. 2 is a perspective view showing the bone plate according to FIG. 1 viewed from above with an inserted bone screw. 2 shows a perspective view of the bone plate according to FIG. 1 as seen from below with an inserted bone screw. FIG. FIG. 6 is a longitudinal sectional view showing a bone plate having bone screws inserted without inclination. It is a longitudinal cross-sectional view which shows the bone plate which has the bone screw inserted in inclination.

  The bone plate 1 shown in FIGS. 1 and 3 has a bone-side lower surface 2, an upper surface 8, and a plurality of plate holes 3 that join the lower surface 2 having a central hole shaft 5 to the upper surface 8. The plate hole 3 has an inner cover surface 4 that tapers conically toward the lower surface 2. Further, the inner cover surface 4 has three recesses 6 extending in a radial direction from the hole shaft 5 at intervals of 120 °. Its peripheral extension is about 40 ° and these are only in the area of the inner cover surface 4. The recess 6 extends conically from the upper surface 8 to the lower surface 2 over the entire height of the bone plate 1. Furthermore, the inner cover surface 4 is provided with a three-dimensional structure 7 in the form of screws.

In FIG. 4, a variant of the embodiment according to FIG. 3 is shown, in which a recess extends radially from the hole axis over the area of the inner cover surface.
In FIGS. 2 and 5, yet another embodiment is shown, in which the plate hole 3 is configured as a slot. The bone plate is mainly made of plastic (PEEK) and has a metal screw insert 9 made of titanium inserted therein, which forms the plate hole 3. The plate hole 3 has four recesses in this embodiment, which extend radially from the hole axis 5 to the inner cover surface 4. The inner cover surface 4 is divided into four cover surface portions. The recess extends conically from the upper surface 8 to the lower surface 2 over the entire height of the bone plate 1. Furthermore, the inner cover surface 4 is provided with a three-dimensional structure 7 in the form of a multi-thread screw. In this embodiment, the bone plate is mainly made of metal (titanium) and has plastic (PEEK) screw inserts 9 inserted therein, which form the plate hole 3 to reverse the material. Can be done.

FIG. 6 shows a bone plate according to FIG. 1 with a bone screw 10 inserted from the top, whose head 11 is configured in a spherical shape. FIG. 7 shows the same bone plate 1 viewed from below.
In FIG. 8, there is shown a bone plate 1 having bone screws 10 inserted therein without inclination. The inner cover surface 4 of the plate hole of the bone plate 1 and the head 11 of the bone screw 10 have threads 13 aligned with each other.
FIG. 9 shows a variant similar to FIG. 8, but here the bone screw 10 is tilted.

DESCRIPTION OF SYMBOLS 1 Bone plate 2 Bone side lower surface 3 Plate hole 4 Inner cover surface 5 Hole shaft 6 Recess 7 Three-dimensional structure 8 Upper surface 9 Screw insert 10 Bone screw 11 Head 13 Screw thread

Claims (18)

  1. A bone-side lower surface (2), an upper surface (8), and a plurality of plate holes (3) connecting the lower surface (2) and the upper surface (8),
    The plate holes (3) each have a central hole axis (5), an inner surface region (4) that narrows toward the lower surface (2), and a thread.
    Wherein the inner surface region (4) has three or more recesses (6) extending radially outward from the hole axis (5), interrupting the thread,
    In the bone plate (1)
    The threads are provided in the plate holes (3), and the recesses (6) each interrupt the threads;
    The screw thread of the head of the inserted head lock screw is different from the screw thread of the plate hole (3) that is interrupted by the recess (6) due to the oblique posture of the head lock screw. Jump over the mountains without overlapping,
    A bone plate (1) characterized in that.
  2.   The bone plate (1) according to claim 1, wherein the inner surface region (4) comprises a three-dimensional structure.
  3.   Bone plate (1) according to claim 1 or 2, characterized in that the inner surface region (4) is configured to be concave, preferably spherical, conical or elliptical.
  4.   The bone according to any one of claims 1 to 3, characterized in that the N recesses (6) are arranged at an interval of 360 ° / N when viewed from the central hole axis (5). Plate (1).
  5.   The bone plate (1) according to any one of claims 1 to 4, characterized in that the recess (6) is only inside the inner surface region (4).
  6.   6. The dent (6) according to claim 1, characterized in that the recess (6) extends radially outward from the central bore axis (5) beyond the range of the inner surface region (4). Bone plate (1) according to
  7.   Bone plate (1) according to any one of the preceding claims, characterized in that the recess (6) extends cylindrically or conically from the upper surface (8) towards the lower surface (2). 1).
  8.   Bone according to any one of the preceding claims, characterized in that the recess (6) extends from the upper surface (8) to the lower surface (2) over the entire height of the bone plate (1). Plate (1).
  9.   At least one said taper head (11) suitable for angle-fixed fixation to at least one said plate hole (3) and a thread (12) intended for fixation in bone Bone plate (1) according to any one of the preceding claims, characterized in that it has a headlock screw as a bone screw (10).
  10.   10. Bone plate (1) according to claim 9, characterized in that the head (11) is configured with a convex surface, preferably spherical or conical.
  11.   Bone plate (1) according to any of claims 9 or 10, characterized in that the inner surface region (4) and the head (5) of the headlock screw (10) have screws aligned with each other. .
  12. The bone plate (1) according to any one of the preceding claims, characterized in that the circumferential spreading angle of the recesses (6) is about 40 °, respectively.
  13. 2. The polyacrylic ether ketone (PEAK) or polyether ether ketone (PEEK) having an elongation at break of 40-70% and an elastic modulus of 3000-6000 N / mm < 2 >. Bone plate (1).
  14. Is formed by polysulfone having a modulus of elongation at break and 2000-3500N / mm 2 of 80-120%, a bone plate according to claim 1, characterized in that (1).
  15. Is formed by a liquid crystal polymer (LCP) having a modulus of elongation at break and 5000-20000N / mm 2 of 1.5 to 2.5%, the bone plate according to claim 1, characterized in that (1).
  16. Is formed by polyoxymethylene (POM) having a modulus of elongation at break and 2000-3500N / mm 2 10-50%, bone plate according to claim 1, characterized in that (1).
  17. Polyphenylene sulfide having a modulus of elongation at break and 12000-20000N / mm 2 of 0.2-1.0% is formed by (PPS), bone plate according to claim 1, characterized in that (1).
  18.   Bone plate (1) according to claim 1, characterized in that it is made of a plastic material reinforced with metal, plastic or carbon fibre.
JP2010250329A 2010-11-08 2010-11-08 Bone plate Active JP5275322B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9103367B2 (en) 2013-03-14 2015-08-11 Imds Llc Polyaxial locking interface
US9404525B2 (en) 2013-03-14 2016-08-02 Imds Llc Polyaxial locking interface

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0530585A2 (en) * 1991-09-03 1993-03-10 Synthes AG, Chur Self-locking resorbable screws and plates for internal fixation of bone fractures and tendon-to-bone attachment
DE4343117A1 (en) * 1993-12-17 1995-06-22 Wolter Dietmar Bone fixation system for Osteosynthesis
JPH10501444A (en) * 1995-03-27 1998-02-10 ジンテーズ アクチエンゲゼルシャフト,クール Bone plate
JPH11512004A (en) * 1995-09-06 1999-10-19 ジンテーズ アクチエンゲゼルシャフト クール Bone plate
JP2001525702A (en) * 1997-05-15 2001-12-11 エスディージーアイ・ホールディングス・インコーポレーテッド Anterior cervical plate device
JP2002542875A (en) * 1999-05-03 2002-12-17 メダルティス・アクチェンゲゼルシャフト Bone plate that can be blocked
JP2003516167A (en) * 1999-03-09 2003-05-13 ジンテーズ アクチエンゲゼルシャフト クール Bone plate

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0530585A2 (en) * 1991-09-03 1993-03-10 Synthes AG, Chur Self-locking resorbable screws and plates for internal fixation of bone fractures and tendon-to-bone attachment
DE4343117A1 (en) * 1993-12-17 1995-06-22 Wolter Dietmar Bone fixation system for Osteosynthesis
JPH10501444A (en) * 1995-03-27 1998-02-10 ジンテーズ アクチエンゲゼルシャフト,クール Bone plate
JPH11512004A (en) * 1995-09-06 1999-10-19 ジンテーズ アクチエンゲゼルシャフト クール Bone plate
JP2001525702A (en) * 1997-05-15 2001-12-11 エスディージーアイ・ホールディングス・インコーポレーテッド Anterior cervical plate device
JP2003516167A (en) * 1999-03-09 2003-05-13 ジンテーズ アクチエンゲゼルシャフト クール Bone plate
JP2002542875A (en) * 1999-05-03 2002-12-17 メダルティス・アクチェンゲゼルシャフト Bone plate that can be blocked

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9103367B2 (en) 2013-03-14 2015-08-11 Imds Llc Polyaxial locking interface
US9404525B2 (en) 2013-03-14 2016-08-02 Imds Llc Polyaxial locking interface
US10024355B2 (en) 2013-03-14 2018-07-17 Imds Llc Polyaxial locking interface

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