EP3294169A1 - Method of creating polyaxial threads and a workpiece with a novel polyaxial thread - Google Patents

Method of creating polyaxial threads and a workpiece with a novel polyaxial thread

Info

Publication number
EP3294169A1
EP3294169A1 EP16723445.9A EP16723445A EP3294169A1 EP 3294169 A1 EP3294169 A1 EP 3294169A1 EP 16723445 A EP16723445 A EP 16723445A EP 3294169 A1 EP3294169 A1 EP 3294169A1
Authority
EP
European Patent Office
Prior art keywords
thread
polyaxial
workpiece
plate
creating
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.)
Withdrawn
Application number
EP16723445.9A
Other languages
German (de)
French (fr)
Inventor
Neil WALTERS
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.)
N2 (uk) Ltd
Original Assignee
N2 (uk) Ltd
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
Priority claimed from GBGB1508532.7A external-priority patent/GB201508532D0/en
Application filed by N2 (uk) Ltd filed Critical N2 (uk) Ltd
Publication of EP3294169A1 publication Critical patent/EP3294169A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/8033—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers
    • A61B17/8047—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers wherein the additional element surrounds the screw head in the plate hole
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/8052—Cortical 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
    • A61B17/8057—Cortical 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/8061—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates specially adapted for particular bones
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61D—VETERINARY INSTRUMENTS, IMPLEMENTS, TOOLS, OR METHODS
    • A61D1/00—Surgical instruments for veterinary use
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G1/00—Thread cutting; Automatic machines specially designed therefor
    • B23G1/32—Thread cutting; Automatic machines specially designed therefor by milling
    • B23G1/34—Thread cutting; Automatic machines specially designed therefor by milling with a cutting bit moving in a closed path arranged eccentrically with respect to the axis of the rotating workpieces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
    • F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
    • F16B39/30—Locking exclusively by special shape of the screw-thread
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G2210/00—Details of threads produced
    • B23G2210/04—Internal threads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G2210/00—Details of threads produced
    • B23G2210/48—Threads having a special form or profile not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/08—Quickly-detachable or mountable nuts, e.g. consisting of two or more parts; Nuts movable along the bolt after tilting the nut
    • F16B37/0807—Nuts engaged from the end of the bolt, e.g. axially slidable nuts
    • F16B37/085—Nuts engaged from the end of the bolt, e.g. axially slidable nuts with at least one unthreaded portion in both the nut and the bolt

Definitions

  • the present invention relates to a method of creating polyaxial threads, and a workpiece with a novel polyaxial thread.
  • FIG. 1 shows part of such an osteosynthesis plate 1 in which holes 10 have polyaxial threads.
  • the method of creating the holes 10 involve a) drilling a round hole in the plate 1, b) milling a thread 11 in the hole wall, and c) machining four radially spaced cut-outs 12A,12B,12C,12D parallel to and radially spaced from the thread axis.
  • the process of creating the cut-outs creates burrs at the ends of the threads which need to be removed by d) re-threading and brushing the holes.
  • This four step process is time consuming leading to additional cost of fabricating such plates 1. It is the cut-outs which allow a threaded head screw to be received at different angles in the polyaxial thread. Also because the thread is not continuous (formed from sections of threads), the thread is structurally weaker. This process can have limitations, as the interrupts in thread form reduce the thread strength and can result in thread stripping if subjected to excessive load after placement or excessive torque during placement. Thread stripping although uncommon will weaken the overall construct. To avoid this occurrence where excessive load after placement is anticipated, it is usual to advise an increase in the plate size to the next range, i.e. 2.7mm to 3.5mm or 3.5mm to 3.5mm broad etc. This is not always ideal for many reasons, one such being wound closure.
  • the invention seeks to provide an easier method of creating a polyaxial thread, and a workpiece with a novel polyaxial thread.
  • a method creating a polyaxial thread comprising milling a tapered Reuleaux triangle threaded aperture in a workpiece.
  • the invention also relates to a workpiece, such as an osteosynthesis plate or TPLO plate, with one or more threaded apertures made by the above method.
  • a workpiece such as an osteosynthesis plate or TPLO plate, with a polyaxial thread formed by a tapered Reuleaux triangle threaded aperture.
  • Figure 2A shows a plan view of an osteosynthesis plate with six thread apertures
  • Figure 2B shows cross-section enlarged view of one aperture of Figure 2A with a cross section of a polyaxial screw therein.
  • Figure 3 shows a plan view of a small and large TPLO (Tibial Plateau Levelling Osteotomy) plate.
  • FIG. 2A there is shown an osteosynthesis plate 20 with six tapered threaded apertures 31,32,33,34,35,36 each made by the method of the invention.
  • Plate 20 may be similar to that shown in Figure l.Each thread 31A,32A,33A,34A,35A,36A of the apertures
  • 31,32,33,34,35,36 is a tapered Reuleaux triangle thread.
  • a Reuleaux triangle is a constant width curve based on an equilateral triangle. All points on a side are equidistant from the opposite vertex.
  • FIG 2B there is shown a cross-section enlarged view of one aperture of Figure 2 A with a cross section of the thread of a tapered polyaxial screw 40 engaged in the tapered Reuleaux thread 31 A of aperture 31.
  • the thread of the screw 40 does not engage in the Reuleaux triangle thread of the aperture 31 adjacent the apexes 3 IB of the triangle whereby radially spaced gaps are provided around the screw 40.
  • This allows a threaded head screw to be received at different angles in the polyaxial thread 31 A, with the gaps serving as if cut-outs (as known hitherto) had been provided.
  • the invention thus allow a polyaxial thread to be produced using a single milling operation so reducing the cost of producing a workpiece, such as an osteosynthesis plate.
  • FIG. 3 there is shown a plan view of a large and small TPLO (Tibial Plateau Levelling Osteotomy) plate 50,60.
  • Plate 50 has five threaded apertures 51,52,53,54,55 with Reuleux triangle threads 51A,52A,53A,54A,55A.
  • Plate 60 has five threaded apertures
  • 61,62,63,64,65,66 with tapered Reuleux triangle threads 61A,62A,63A,64A,65A,66A.
  • the tread formed as a Reuleux triangular thread is a continuous thread, which provides a stronger structure than a thread formed with sections of thread as hitherto known, thus improving the rigidity of the locking surface.
  • the Reuleux triangular thread in a workpiece by a milling process, it could be formed by any other suitable manufacturing technique, such as 3D printing techniques or using a lathe.
  • the invention thus also relates to a workpiece, such as an osteosynthesis plate or TPLO plate, with a polyaxial thread formed by a tapered Reuleaux triangle threaded aperture.
  • the invention may take a form different to that specifically described above.

Landscapes

  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Veterinary Medicine (AREA)
  • Animal Behavior & Ethology (AREA)
  • Public Health (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Biomedical Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Surgical Instruments (AREA)

Abstract

The invention relates to a method creating a polyaxial thread comprising milling a tapered Reuleaux triangle threaded aperture in a workpiece. The invention also relates to a workpiece, such as an osteosynthesis plate or TPLO plate, with one or more threaded apertures made by the above method. The invention also relates to a workpiece, such as an osteosynthesis plate or TPLO plate, with a polyaxial thread formed by a tapered Reuleaux triangle threaded aperture.

Description

TITLE: Method of Creating Polvaxial Threads and
a Workpiece with a Novel Polvaxial Thread
The present invention relates to a method of creating polyaxial threads, and a workpiece with a novel polyaxial thread.
It is known to create poly-axial threads in workpieces such as osteosynthesis or TPLO (Tibial Plateau Levelling Osteotomy) plates. Figure 1 shows part of such an osteosynthesis plate 1 in which holes 10 have polyaxial threads. The method of creating the holes 10 involve a) drilling a round hole in the plate 1, b) milling a thread 11 in the hole wall, and c) machining four radially spaced cut-outs 12A,12B,12C,12D parallel to and radially spaced from the thread axis. The process of creating the cut-outs creates burrs at the ends of the threads which need to be removed by d) re-threading and brushing the holes. This four step process is time consuming leading to additional cost of fabricating such plates 1. It is the cut-outs which allow a threaded head screw to be received at different angles in the polyaxial thread. Also because the thread is not continuous (formed from sections of threads), the thread is structurally weaker. This process can have limitations, as the interrupts in thread form reduce the thread strength and can result in thread stripping if subjected to excessive load after placement or excessive torque during placement. Thread stripping although uncommon will weaken the overall construct. To avoid this occurrence where excessive load after placement is anticipated, it is usual to advise an increase in the plate size to the next range, i.e. 2.7mm to 3.5mm or 3.5mm to 3.5mm broad etc. This is not always ideal for many reasons, one such being wound closure.
The invention seeks to provide an easier method of creating a polyaxial thread, and a workpiece with a novel polyaxial thread.
According to a first aspect of the present invention there is provided a method creating a polyaxial thread comprising milling a tapered Reuleaux triangle threaded aperture in a workpiece.
The invention also relates to a workpiece, such as an osteosynthesis plate or TPLO plate, with one or more threaded apertures made by the above method.
According to a second aspect of the present invention there is provided a workpiece, such as an osteosynthesis plate or TPLO plate, with a polyaxial thread formed by a tapered Reuleaux triangle threaded aperture.
Embodiments of the invention will now be described with reference to the accompanying drawings in which:
Figure 2A shows a plan view of an osteosynthesis plate with six thread apertures, and Figure 2B shows cross-section enlarged view of one aperture of Figure 2A with a cross section of a polyaxial screw therein.
Figure 3 shows a plan view of a small and large TPLO (Tibial Plateau Levelling Osteotomy) plate.
Referring to the Figure 2A there is shown an osteosynthesis plate 20 with six tapered threaded apertures 31,32,33,34,35,36 each made by the method of the invention. Plate 20 may be similar to that shown in Figure l.Each thread 31A,32A,33A,34A,35A,36A of the apertures
31,32,33,34,35,36 is a tapered Reuleaux triangle thread. A Reuleaux triangle is a constant width curve based on an equilateral triangle. All points on a side are equidistant from the opposite vertex.
In Figure 2B there is shown a cross-section enlarged view of one aperture of Figure 2 A with a cross section of the thread of a tapered polyaxial screw 40 engaged in the tapered Reuleaux thread 31 A of aperture 31. As shown the thread of the screw 40 does not engage in the Reuleaux triangle thread of the aperture 31 adjacent the apexes 3 IB of the triangle whereby radially spaced gaps are provided around the screw 40. This allows a threaded head screw to be received at different angles in the polyaxial thread 31 A, with the gaps serving as if cut-outs (as known hitherto) had been provided. The invention thus allow a polyaxial thread to be produced using a single milling operation so reducing the cost of producing a workpiece, such as an osteosynthesis plate.
In Figure 3 there is shown a plan view of a large and small TPLO (Tibial Plateau Levelling Osteotomy) plate 50,60. Plate 50 has five threaded apertures 51,52,53,54,55 with Reuleux triangle threads 51A,52A,53A,54A,55A. Plate 60 has five threaded apertures
61,62,63,64,65,66 with tapered Reuleux triangle threads 61A,62A,63A,64A,65A,66A.
It will be seen that the tread formed as a Reuleux triangular thread is a continuous thread, which provides a stronger structure than a thread formed with sections of thread as hitherto known, thus improving the rigidity of the locking surface.
Instead of forming the Reuleux triangular thread in a workpiece by a milling process, it could be formed by any other suitable manufacturing technique, such as 3D printing techniques or using a lathe.The invention thus also relates to a workpiece, such as an osteosynthesis plate or TPLO plate, with a polyaxial thread formed by a tapered Reuleaux triangle threaded aperture.
The invention may take a form different to that specifically described above.
Further modification will be apparent to those skilled in the art without departing form the scope of the present invention.

Claims

1. A method of creating a polyaxial thread comprising milling a tapered Reuleaux triangle threaded aperture in a workpiece.
2. A workpiece with one or more threaded apertures made by the method of claim 1.
3. A workpiece according to claim 2 when in the form of an osteosynthesis plate or TPLO plate.
4. A workpiece with a polyaxial thread formed by a tapered Reuleaux triangle threaded aperture.
5. A workpiece according to claim 4 when in the form of an osteosynthesis plate or TPLO plate.
6. A method of creating a polyaxial thread substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
7. A workpiece substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
EP16723445.9A 2015-05-15 2016-05-12 Method of creating polyaxial threads and a workpiece with a novel polyaxial thread Withdrawn EP3294169A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB1508532.7A GB201508532D0 (en) 2015-05-15 2015-05-15 Method of creating polyaxial threads
GB1516298.5A GB2542350A (en) 2015-05-15 2015-09-15 Method of creating polyaxial threads and a workpiece with a novel polyaxial thread
PCT/GB2016/000097 WO2016185156A1 (en) 2015-05-15 2016-05-12 Method of creating polyaxial threads and a workpiece with a novel polyaxial thread

Publications (1)

Publication Number Publication Date
EP3294169A1 true EP3294169A1 (en) 2018-03-21

Family

ID=56015034

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16723445.9A Withdrawn EP3294169A1 (en) 2015-05-15 2016-05-12 Method of creating polyaxial threads and a workpiece with a novel polyaxial thread

Country Status (3)

Country Link
EP (1) EP3294169A1 (en)
GB (1) GB2542350A (en)
WO (1) WO2016185156A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4108194B1 (en) 2018-03-02 2025-10-29 Stryker European Operations Limited Bone plates and associated screws

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8519854U1 (en) * 1985-07-05 1986-04-30 Mecron Medizinische Produkte Gmbh, 1000 Berlin Self-tightening straight bone plate
DE9114118U1 (en) * 1991-11-13 1992-01-02 Howmedica GmbH, 2314 Schönkirchen Supports for the human spine
US8936615B2 (en) * 2010-04-27 2015-01-20 DePuy Synthes Products, LLC Bone fixation system including K-wire compression
EP3659535B1 (en) * 2010-06-02 2023-10-18 Synthes GmbH Bone plate
US9404525B2 (en) * 2013-03-14 2016-08-02 Imds Llc Polyaxial locking interface

Also Published As

Publication number Publication date
WO2016185156A1 (en) 2016-11-24
GB2542350A8 (en) 2017-10-25
GB201516298D0 (en) 2015-10-28
GB2542350A (en) 2017-03-22

Similar Documents

Publication Publication Date Title
CA2898480C (en) Anti-slip screwdriver bit
TW201447118A (en) Concrete screw, rolling jaw and process for its production
JP2016514624A (en) Dice turning
US9719549B2 (en) Bolt
US20130051909A1 (en) Metal member and resin product having metal member
WO2016185156A1 (en) Method of creating polyaxial threads and a workpiece with a novel polyaxial thread
US20150125303A1 (en) Impeller, impeller cutting jig, and method of machining impeller
JP5361375B2 (en) Hollow bolt with longitudinal holes
CH703529A1 (en) Slip-proof mounting system, consisting of a screw connection element and a key for tightening and loosening of the screw fastener.
KR101350491B1 (en) Self Tapping Bolts
JP2010054015A (en) Screw member and its manufacturing method
US20170100792A1 (en) Method for manufacturing a striking plate for a golf club head
KR20090036682A (en) Fixing nuts or bolts
US20120074364A1 (en) Flat belt clamping pulley
KR101605422B1 (en) Lock Nut Manufacturing Method by Forging and Lock Nut Thereof
US9464656B2 (en) Self-drilling fixing and assembly component
JP6890756B2 (en) Parent-child claw for chuck
KR102677275B1 (en) Plate for machining bolt lengths to the same dimension
US10508678B2 (en) Method of forming linking block
KR20210000808U (en) Thread mill for the sheet
CN203176117U (en) Fastener and special tool thereof
WO2007105852A1 (en) Combination structure of coupling boss and plate
EP3756804B1 (en) Tapered countersink drill bit
CN103231092A (en) Flat section bar positioning drilling jig
EP3964722B1 (en) Self-locking threaded connection element

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20171215

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20201201