AU756798B2 - Bone plate with conical screw threads - Google Patents

Bone plate with conical screw threads Download PDF

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Publication number
AU756798B2
AU756798B2 AU26072/99A AU2607299A AU756798B2 AU 756798 B2 AU756798 B2 AU 756798B2 AU 26072/99 A AU26072/99 A AU 26072/99A AU 2607299 A AU2607299 A AU 2607299A AU 756798 B2 AU756798 B2 AU 756798B2
Authority
AU
Australia
Prior art keywords
plate
bone
bone plate
thread
underside
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
AU26072/99A
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AU2607299A (en
Inventor
Robert Frigg
Robert Schavan
Michael Wagner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Synthes GmbH
Original Assignee
AO Technologies AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
Application filed by AO Technologies AG filed Critical AO Technologies AG
Priority to PCT/CH1999/000107 priority Critical patent/WO2000053111A1/en
Publication of AU2607299A publication Critical patent/AU2607299A/en
Application granted granted Critical
Publication of AU756798B2 publication Critical patent/AU756798B2/en
Assigned to SYNTHES GMBH reassignment SYNTHES GMBH Alteration of Name(s) in Register under S187 Assignors: SYNTHES AG, CHUR
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=4551663&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=AU756798(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Anticipated expiration legal-status Critical
Application status is Ceased legal-status Critical

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/80Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/8052Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
    • A61B17/8057Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded the interlocking form comprising a thread
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/80Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/8004Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates with means for extending or compressing the bone or bones
    • A61B17/8014Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates with means for extending or compressing the bone or bones the extension or compression force being caused by interaction of the plate hole and the screws

Description

BONE PLATE WITH CONICAL THREAD The invention relates to a bone plate and to an affixation system including a bone plate.

Basically there are two kinds of osteosyntheses implemented with bone plates.

The first kind relates to ,,rigid osteosynthesis". Rigid osteosynthesis is used when treating fractures of joints, simple shaft fractures (where nailing is impossible), and also osteotomies. Aside anatomic repositioning ability, the bone per se supports the stability of osteosynthesis, resulting in earlier and more pain-free extremity-stressing.

The advantages of stable fracture treatment also are observed where the blood circulation on account of trauma has been substantially reduced. When treating ,,nonunions" or in the presence of infection, the fracture must be treated in stabilized manner to allow bone healing and to preclude further stimulating the infection by instability in the fracture gap.

The second kind relates to ,,flexible osteosynthesis". The biggest advantages of flexible (biological) osteosynthesis relate to caring for comminuted fractures in the shaft zone of long bones. The goal relating to these fractures is keeping the bone lengths, and furthermore the bone ends (joints), in their proper mutual positions. In this procedure the fracture zone is not directly affixed or manipulated, and consequently the blood circulation in this zone is not additionally hampered. The bone plates operate similarly to a locking, medullary pin solely anchored in the metaphyses.

These two extremes of plate osteosynthesis, they are indeed far apart. Fractures cannot always be assigned to either kind of osteosynthesis, and accordingly the surgeon frequently must compromise because no implant tradeoff is available to him when combining both methods. Such a combination for instance would be called for when a joint fracture can be compressed by means of tightening screws through the b bone plate and the full joint part can be connected, by means of an inner affixation system, using angularly invariant screws to the diaphysis. Another application illustratively concerns porous bones where a bone plate can be anchored by axially and angularly stabilized screws in the metaphysial fragment, stable plate affixation being possible in the diaphyseal range and being supported by a plate tightening screw passing through the fracture. Primary fracture stabilization can be achieved by this kind of care.

As a result, bone implants have been developed for both kinds of osteosynthesis and are now on the market. Both sets of implants are optimally designed for each method.

The drawback of both systems therefore is that they cannot be combined.

S Such a combined plate is known from the US Talos et al patent 5,709,686 wherein a cylindrical thread is present in the middle part of the elongated hole. The drawbacks of this known plate are the following: 1) Because the thread is cylindrical, a special screw head must be used, that, when the screw is being tightened, can rest on the plate surface.

2) The central position of the thread in the elongated hole of the plate restricts the range of the thread between 60 and 1790, 3) The central position of the thread in the elongated hole (clamping hole) of the plate is subject to the danger that the side webs of the elongated hole may widen, 4* The above discussion of background art is included to explain the context of the present invention. It is not to be taken as an admission that any of the documents or other material referred to was published, known or part of the common general knowledge in Australia at the priority date of any of the claims of this specification.

The objective of the invention is remedy. Its goal is to create a bone plate which combines both kinds of osteosynthesis without however entailing restriction on the care inherently afforded by the two plates per se. Accordingly the plate of the invention shall serve both as a compression plate and as a so-called inner affixation system B.without incurring tradeoffs.

Broadly, the invention provides a bone plate including a top side, an underside that shall make contact with the bone, and several holes from the top side to the underside and configured along the longitudinal plate axis for receiving bone screws, wherein a) the diameter DL of at least one of these holes when measured in the direction of the longitudinal plate axis is larger than the diameter DQ of this hole when measured perpendicularly to the longitudinal plate axis, and b) at least one of these holes is fitted with an inside thread, whereby c) at least one of the holes defined in feature includes a concave recess in its portion facing the top side to receive a bone screw having a spherical head, and wherein d) the inside thread conically tapers in the direction of the bone-plate's underside; and e) the cone angle of the inside thread is between 5 and 200.

The bone plate of the invention offers the advantage that the screw shall be affixed by means of the conical thread of the plate hole and the matching conical thread of the screwhead being used. This kind of affixation is especially important when self-drilling screws are to be used. Thanks to the conical thread in the screwhead zone, the screw can be inserted into the bone independently of the plate. The screw shall be clamped

SI

S

I

lS only as the threaded cone of the screwhead enters the inside thread of the plate's elongated hole. In spite of different beginnings of the threads in the cone of the plate hole and in the bone, the conical screwhead thread will center in the threaded cone of the plate. When the conical thread is tightened, radial forces are generated in the plate hole. In order to adequately absorb these forces, the conical plate must be sufficiently dimensionally stable.

Appropriately therefore the inside thread conically tapering toward the underside of the bone plate subtends a conical angle of 5 200, typically of 100.

Using the plate of the invention as an inner affixation system results in much more stressing the interface of plate and screw because the plate is not forced against the bone and therefore the bone fracture is fixed on account of friction between the plate and the bone. This increase in stress is accounted for in that the thread in the elongated hole subtends a range of at least 1800 and thereby will enclose the thread of the screwhead by at least this angular range. This circumstance is especially significant where thin bone plates are involved.

In a further preferred embodiment, the holes defined by the features and are mutually identical and consequently the inside thread is fitted within a hole of which the diameter DL measured in the direction of the longitudinal plate axis is larger than this hole's diameter DQ measured perpendicularly to said longitudinal plate axis.

In another preferred embodiment of the invention, the inside thread, when seen in the direction of the longitudinal plate axis, is present at one of the two ends of the elongated hole. This position allows attaining an enlarged thread zone extending for instance to arcs from 190 to 2800, preferably from 200 to 2500.

Because the elongated hole is conical, there will be various values of the range of the inside thread at the underside or at the upper side of the plate. Measured at the underside, the arc of the thread preferably shall run from 180 to 2300, whereas measured at the top side it shall preferably run from 200 to 2700.

P/

t Vi In a further preferred embodiment, the terminal, conical thread in the elongated hole (clamping hole) is present at that end which is nearest the center of the plate. This feature offers the advantage of leaving undegraded the clamping of the plate clamping holes.

As regards another preferred embodiment, at least one of the holes defined by feature comprises at its upper portion facing the top side a concave and preferably spherical recess to receive a bone screw with a ballhead. This spherical screwhead of a conventional bone screw is optimally seated in this concave, spherical recess, foremost if the bone screw was inserted excentrically as required in fracture compression.

In a further preferred embodiment the underside is concave. Because of this concave underside, the plate better matches the round cross-section of the tibia, femur, humerus and lower arm bone. Because the plate underside is concave, it is possible to insert a conventional bone screw obliquely through the plate hole. Such a feature is important foremost when gripping a small bone fragment which must be pulled up to the plate.

In a further preferred embodiment, the inside thread runs over the full thickness of the bone plate from the underside to the top side in order to maximize dimensional stability.

In yet another preferred embodiment, the elongated hole flares in its thread-free sector, in its lower portion facing the underside, to allow bone-screw excursion.

In yet another preferred embodiment, the ratio of DL/DQ is within the range of 1.01 3.00, preferably in the range of 1.1 1.5. This ratio follows from the combination of the clamping hole, which requires some clamping path for the screw, with the threaded hole. The ascertained ratio of DL/DQ represents an optimal compromise between clamping effectiveness and minimal plate weakening by the combination hole.

Besides the bone plate of the invention, another embodiment additionally comprises at least one bone screw with an outer thread fitted on the screw head and matching the sUide thread, said at least one bone screw preferably being self-drilling.

0.F When the bone plate is used as a compression plate, the geometry of the clamping hole of the plate borehole is not adversely affected by the terminal, conical threaded hole. The advantage offered by the conical feature of the threaded hole 4 is that the screw can be inserted in plate-independent manner into the bone, the screw being connected to the plate by means of a threaded and matching screwhead only when the plate is being tightened. Such a feature is advantageous foremost when using selftapping and self-drilling screws.

The invention and its further development are elucidated below in relation to the partly diagrammatical drawings of several illustrative embodiments.

Fig. 1 is a topview of the bone plate of the invention comprising an unthreaded elongated hole and a separate threaded hole, Fig. 2 is a topview of the bone plate of the invention comprising an elongated hole with an integrated thread, Fig. 3 is a longitudinal section of the threaded hole of Fig. 1, Fig. 4 is a longitudinal section of the threaded elongated hole of Fig. 2, and Fig. 5 is a perspective of the bone plate of the invention with a bone screw inserted into the-elongated-hole-with integrated-thread-.

The bone plate of the invention shown in Fig. 1 comprises a top side 1, an underside 2 that shall make contact with the bone and two holes 4 situated along the longitudinal plate axis 3 which shall receive the bone screws. The arrow 7 indicates the direction toward one end of the bone plate and the arrow 8 points toward the center of the plate.

The diameter DL of the hole 4 which is closer to the center of the plate when measured in the direction of the longitudinal plate axis 3 is larger than this hole's diameter DQ measured perpendicularly to said axis 3. The diameter DL is 5.2 mm and the diameter DQ is 3 mm.

This elongated hole is fitted at its upper portion facing the top side 1 with a concave and preferably spherical recess 6 to receive a bone screw having a spherical head.

,Siu.e hole 4 situated near the plate end comprises an inside thread 5 subtending an arc of _3600. In the artist's rendition of this embodiment, this plate hole assumes the shape of a cone tapering downward toward the underside 2, and accordingly the inside thread also tapers downward toward the bone plate's underside 2 at a cone angle of 100.

Preferably the inside thread 5 is a double thread.

As shown in Fig. 3, the inside thread 5 of the hole 4 nearer the plate end runs along the full thickness of the bone plate from the top side 1 to the underside 2.

In the preferred embodiment of the invention shown in Figs. 2 and 4, the two boneplate holes 4 of Fig. 1 are combined .as a result of which the inside thread 5 shall be inside both elongated holes 4. The thread 5 is situated at that end of the elongated hole which is nearer the center of the plate.

Furthermore the two elongated holes are the same as in the embodiment of Fig. 1.

Measured at the underside2 and as indicated by the arc of circle 9, the inside thread subtends an arc of 2230 and when measured at the top side 1 and as indicated by the arc of circle 10 subtends an arc of 2560.

The-table below- the- preferred -parameters- depending on- the diameter of- the- inside thread thread diameter 3.0 mm 4.0 mm 5.0 mm double thread yes yes yes pitch of thread 0.7 [mm] 0.9 [mm] 1.0 [mm] depth of thread 1/2 of outside/inside 0.2025 [mm] 0.2575 0.2810 diameter- differential) [mm] [mm] angular excursion (at top side) 2000 2000 1900 angular excursion (at underside) 2600 2400 2500 Shape of the thread Conical Conical Conical Fig. 5 shows an affixation system fitted with a bone plate as shown in bone screw 11 comprising an outside thread 12 at the screwhead Fig. 4, wherein a 13, said outside N ft. R 7 thread 12 matching the bone-plate's inside thread 5. Appropriately the bone screw 12 is self-drilling and self-tapping.

Claims (18)

1. A bone plate including a top side, an underside that shall make contact with the bone, and several holes from the top side to the underside and configured along the longitudinal plate axis for receiving bone screws, wherein a) the diameter DL of at least one of these holes when measured in the direction of the longitudinal plate axis is larger than the diameter DQ of this hole when measured perpendicularly to the longitudinal plate axis, and b) at least one of these holes is fitted with an inside thread, whereby c) at least one of the holes defined in feature includes a concave recess in its portion facing the top side to receive a bone screw having a spherical head, and wherein d) the inside thread conically tapers in the direction of the bone-plate's underside; and e) the cone angle of the inside thread is between 5 and 200.
2. Bone plate as claimed in claim 1, wherein the inside thread subtends an arc of at least 1800 of the geometric body formed by it.
3. Bone plate as claimed in either of claims 1 or 2, wherein the inside thread subtends an arc of 1900 to 2800 of the geometric body formed by it.
4. Bone plate as claimed claim 3, wherein the inside thread subtends an arc of 2000 to 2500 of the geometric body formed by it.
Bone plate as claimed in any one of claims 1 through 4, wherein when measured at the underside the inside thread runs across an arc of 1800 to 2300 and when measured at the top side it runs across an arc of 2000 to 2700.
6. Bone plate as claimed in any one of claims 1 through 5, wherein the holes defined by the features and are mutually identical whereby the inside thread is fitted inside a hole of which the diameter DL when measured in the direction of the longitudinal plate axis is larger than the diameter DQ of this hole measured perpendicularly to the longitudinal plate axis. WA:myVJRN 648915 Spec.dO 9
7. Bone plate as claimed in claim 6, wherein when seen in the direction of the longitudinal plate axis, the inside thread is situated at one of the two ends of the elongated hole defined in feature preferably nearer the plate's centre.
8. Bone plate as claimed in any one of claims 1 through 7, wherein the concave recess is spherically configured.
9. Bone plate as claimed in any one of claims 1 through 8, wherein the underside is concave.
Bone plate as claimed in any one of claims 1 through 9, wherein the inside thread runs through the full thickness of the bone plate from the top side to the underside. l 0 0•
11. Bone plate as claimed in any one of claims 1 through 10, wherein the hole flares in its unthreaded sector in its lower portion facing the underside.
12. Bone plate as claimed in any one of claims 1 through 11, wherein the ratio of DL/DQ is S: in the range of 1.01 to 3.00.
13. Bone plate as claimed in claim 12, wherein the ratio of DL/Do is in the range of 1.1 to *0 0 0I
14. An affixation system including a bone plate as claimed in any one of claims 1 through 13, wherein in addition it includes at least one bone screw fitted with an outer thread at the screwhead, said outer thread matching the inside thread.
Affixation system as claimed in claim 14, wherein the bone screw is self-drilling.
16. Affixation system as claimed in either of claims 14 or 15, wherein the bone screw is self-tapping.
17. A bone plate substantially as herein described with reference to the accompanying Srawings. N 48915 Spec.do
18. An affixation system substantially as herein described with reference to the accompanying drawings. DATED: 24 October 2002 PHILLIPS ORMONDE FITZPATRICK Attorneys for: SYNTHES AG CHUR 0 0 ao .0. 0 .00. 000. 0:a. 0 a a 'IP Australia 2 5 OCT 2002 IM VV~ eogaP GSe1681.o
AU26072/99A 1999-03-09 1999-03-09 Bone plate with conical screw threads Ceased AU756798B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CH1999/000107 WO2000053111A1 (en) 1999-03-09 1999-03-09 Bone plate with conical screw threads

Publications (2)

Publication Number Publication Date
AU2607299A AU2607299A (en) 2000-09-28
AU756798B2 true AU756798B2 (en) 2003-01-23

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ID=4551663

Family Applications (1)

Application Number Title Priority Date Filing Date
AU26072/99A Ceased AU756798B2 (en) 1999-03-09 1999-03-09 Bone plate with conical screw threads

Country Status (15)

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EP (1) EP1158916B1 (en)
JP (1) JP4276386B2 (en)
CN (1) CN1149057C (en)
AT (1) AT270526T (en)
AU (1) AU756798B2 (en)
CA (2) CA2626694C (en)
DE (1) DE59909921D1 (en)
DK (1) DK1158916T3 (en)
ES (1) ES2223163T3 (en)
HK (1) HK1039266A1 (en)
NZ (1) NZ513747A (en)
PT (1) PT1158916E (en)
TW (1) TW580379B (en)
WO (1) WO2000053111A1 (en)
ZA (1) ZA200001217B (en)

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CA2367088A1 (en) 2000-09-14
DE59909921D1 (en) 2004-08-12
EP1158916B1 (en) 2004-07-07
AT270526T (en) 2004-07-15
HK1039266A1 (en) 2004-12-03
ES2223163T3 (en) 2005-02-16
CA2626694A1 (en) 2000-09-14
WO2000053111A1 (en) 2000-09-14
TW580379B (en) 2004-03-21
PT1158916E (en) 2004-11-30
CA2367088C (en) 2008-07-15
ZA200001217B (en) 2000-09-26
CN1337864A (en) 2002-02-27
NZ513747A (en) 2002-12-20
EP1158916A1 (en) 2001-12-05
JP4276386B2 (en) 2009-06-10
JP2003516167A (en) 2003-05-13
AU2607299A (en) 2000-09-28
CA2626694C (en) 2011-08-02
DK1158916T3 (en) 2004-10-04
CN1149057C (en) 2004-05-12

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