US20060116678A1 - Self-locking osteosynthesis device - Google Patents

Self-locking osteosynthesis device Download PDF

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Publication number
US20060116678A1
US20060116678A1 US10/530,683 US53068305A US2006116678A1 US 20060116678 A1 US20060116678 A1 US 20060116678A1 US 53068305 A US53068305 A US 53068305A US 2006116678 A1 US2006116678 A1 US 2006116678A1
Authority
US
United States
Prior art keywords
plate
holes
screws
comprised
inserts
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.)
Abandoned
Application number
US10/530,683
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English (en)
Inventor
Frederic Impellizzeri
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.)
Biotech International SAS
Original Assignee
Biotech International SAS
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
Application filed by Biotech International SAS filed Critical Biotech International SAS
Assigned to BIOTECH INTERNATIONAL (SARL) reassignment BIOTECH INTERNATIONAL (SARL) ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IMPELLIZZERI, FREDERIC
Publication of US20060116678A1 publication Critical patent/US20060116678A1/en
Priority to US12/788,835 priority Critical patent/US8951291B2/en
Priority to US14/617,551 priority patent/US20150150610A1/en
Abandoned legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • 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, setting implements or the like
    • 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, e.g. tourniquets
    • 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, setting implements or the like
    • 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
    • A61B17/8085—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates with pliable or malleable elements or having a mesh-like structure, e.g. small strips
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • 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, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/8605—Heads, i.e. proximal ends projecting from bone
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • 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, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
    • A61B17/86—Pins or screws or threaded wires; nuts therefor
    • A61B17/864—Pins or screws or threaded wires; nuts therefor hollow, e.g. with socket or cannulated

Definitions

  • the invention relates to a self-locking osteosynthesis or osteotomy device of the type comprising a plate having an appropriate shape designed to be affixed on bone fragments using a screw to ensure their coaptation.
  • the coaptation of the bone fragments using plates of titanium or another material and screws in order to create an osteosynthesis is a common operation in bone surgery, for example, orthopedic surgery.
  • EP-0,345,133, FR-2,794,963 In order to prevent the screws from unscrewing and moving back, it has been proposed (EP-0,345,133, FR-2,794,963) to house the locking instruments at the input of the screw holes into the plates, in order to eliminate any possibility of axial movement of the screws, after they are tightened in the bony material.
  • EP-0,345,133 it is provided in the document EP-0,345,133, to use check screws that are outside-threaded and work together with a complementary threading arranged at the input of the holes of the screws that equip the plates, in a manner so that the head of the screws is wedged against a check screw and that the check screws can not move axially relative to the plates, this locking thus ensuring the permanent support of the plate on the bone fragments.
  • a device for connecting two elements such as an implant and a bone, according to which the implant comprises screw holes with axes oriented at an angle to each other, in a manner so that the screws going through these holes have orientations that are rigorously imposed by the direction of these axes.
  • a device of this type can only be planned for the reduction of identical fractures, because otherwise it would be necessary to provide as many plate models as possible cases of fractures, which is practically impossible; in fact, it does not offer any possibility to choose the orientation of the screws as a function of the problems encountered in orthopedic surgery.
  • the invention has the purpose of correcting the shortcomings mentioned above for osteosynthetic systems using plates and screws, notably because of the fact that the existing devices for serious orthopedics (treatment of serious traumatisms) can not be transposed to hand and foot surgery in which the dimension of the plates that can be used becomes considerably reduced.
  • this purpose is achieved using an osteosynthesis comprising a plate which is equipped with holes for the passage of screws for fixation of this plate onto a bone support.
  • This device is notable in that the osteosynthesis plate is made, at least in the zones that define the screw holes, of a material that has mechanical properties to allow self-tapping of the periphery of the holes with the tapping screws used to fix the plate.
  • the osteosynthesis plate is made of a composite plate with hole peripheries comprised of inserts made of a plastic biocompatible material, and inserted into the holes in the remaining part of the plate which is made of metal.
  • the hole peripheries are comprised of inserts made of polyether ether ketone (PEEK), and the remaining part of the plate is made of titanium.
  • PEEK polyether ether ketone
  • the head of the screws has a conical thread tapping mechanism.
  • the self-locking head of the screws drills its own helicoid receiving groove in the periphery of the holes in which they are engaged, in a manner so that the screws are then automatically locked in the plate when their head is tightened into its housing.
  • the osteosynthesis plate according to the invention allows a selective angulation of the screws relative to the axis of the holes of the plate, as a function of the requirements.
  • the osteosynthesis device according to the invention provides several advantages:
  • This osteosynthesis device thus meets perfectly the expectations of surgeons in terms of ease of implementation and reliability of usage.
  • FIG. 1 is a perspective view, with a partial excerpt, of an osteosynthesis plate according to the invention, with a configuration given solely as an example.
  • FIG. 2 is a side view, with a partial section, of FIG. 1 .
  • FIG. 3 is an elevation view, with a partial axial section and enlarged scale, of a conical screw head that can be used to implement the invention.
  • FIG. 4 is a detail view showing, in an axial section, an insert implanted into an osteosynthesis plate for reception of a tapping screw.
  • FIG. 5 is a section and perspective view of this insert.
  • FIG. 6 is a view showing a tapping screw tightened into this insert and into a bone fragment.
  • FIG. 7 is an elevation view, with partial sections, showing the fixation of an osteosynthesis plate according to the invention for coaptation of bone fragments, two of the fixation screws (right and left) are shown completely tightened into the bone fragments and into the plate, a third screw (in the center) being shown during its implementation.
  • This device comprises a plate 1 equipped with passage holes 2 and fixation screws 3 .
  • the plate 1 is made, at least in the defining zones of the passage holes 2 of the screws 3 , of a material 4 that has the mechanical properties that allow a self-locking of the periphery of these holes using tapping screws for the fixation of the plate on the bone material.
  • the plate 1 can have any shape designed for the cases to be treated with reduction of fractures or restorative surgery; the shape shown in FIG. 1 is thus only a possible example of the shape, and the same applies for the placement of the holes 2 in the plate.
  • the plate 1 is made up of a composite plate whose peripheries 4 of the holes 2 are made of a plastic biocompatible material, the remaining part or surface 5 of the plate being made of metal.
  • the peripheries 4 of the holes 2 can be made of a high-performance thermoplastic polymer.
  • the peripheries 4 of the holes 2 are made of polyether ether ketone (PEEK) that has very high mechanical properties and can be machined, like a metal.
  • PEEK polyether ether ketone
  • the remaining part or surface 5 of the plates 1 can be made of stainless steel, and in a preferred and advantageous manner, it is made of titanium.
  • the solid fixation of the inserts made from the peripheries 4 of the holes 2 in the holes 6 arranged in the plate having a metal base 5 can be made by a technique of molding from a casting having the advantage of ensuring an intimate contact between the two materials.
  • the implementation of the inserts with PEEK 4 into the holes 6 of the metal plate 5 is done by means of a mechanical assembly.
  • the inserts made of PEEK 4 are engaged, by deformation and pressure in the holes of the metal plate and are then held in these holes.
  • the inserts 4 can comprise a peripheral groove 4 a in which an upper edge 6 a of the holes 6 of the plate 1 come to engage, while the inserts are pushed into the holes.
  • the inserts 4 deform and are compressed between the edges of the holes 6 of the metal plate 5 , which contributes to the solidity of the anchorage of these inserts in the metal plate.
  • a mechanism is provided to prevent any possibility of rotation of the inserts 4 in the holes 6 of the plate 5 when the screws are screwed into these inserts.
  • This mechanism can, for example, be comprised of one or more grooves arranged in the inside cylindrical surface of the holes 6 of the plate 5 , in parallel to the axis of the holes.
  • the inserts 4 are solidly connected to the plate 1 without the possibility of axial movement or rotation.
  • the holes 2 have a conical shape.
  • the large opening 2 a of the holes 2 accessible from the outside of the plate 1 comprise the input for them, while the small opening 2 b of the holes 2 opens onto the inside of the plate designed to be applied to the parts of the bone to be assembled.
  • the conical wall 7 of the holes 2 of the inserts 4 is smooth and does not contain any threading before the use of the osteosynthesis plate.
  • the screws 3 that can be used for fixation of the osteosynthesis plate 1 described above comprise a proximal part or head 8 equipped with a conical threading tapping mechanism 9 having a diameter that increases in the direction of the proximal end of the screws.
  • These screws are, for example, the type described in the document WO 98/40024. They comprise a distal part 10 provided with a cylindrical threading 11 , a proximal part or head 8 equipped with a conical threading tapping mechanism 9 , and, preferably, a smooth intermediate section 12 arranged between the distal part 10 and proximal part 8 .
  • the screws are made of any suitable biocompatible material and they can be advantageously of the “cannular” type, i.e. equipped with an axial canal 13 that extends from one end to the other of the screws, for the passage of a pin.
  • the nominal diameter of the cylindrical threading 111 of the distal part 10 of the screws is less than the diameter of the small opening 2 b of the holes 2 , so that the distal part of the screws can go through the holes freely during the fixation of the osteosynthesis plate 1 on the bones.
  • the composite osteosynthesis plate according to the invention allows a tightening of the screws 3 at a certain angulation relative to the axes of the holes 2 of the plate.
  • FIG. 7 shows an example of coaptation of the pieces of the bones O 1 and O 2 by means of the osteosynthesis device according to the invention.
  • the osteosynthesis plate 1 is seen pressed against the bone pieces O 1 and O 2 , by means of two screws 3 completely tightened, whose distal part 10 is tightened into the bone material 14 and whose proximal part 8 is tightened into the inserts 4 of the plate, the screws having different orientations and being locked using the devices described above.
  • the invention makes it possible to obtain a locking of the screws eliminating any possibility of moving back after they are tightened in the bone material. This locking is all the more effective since the conical threaded head tapping mechanism of the screws produces a jamming effect resulting from the conical assembly of the screws and the inserts.

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Neurology (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)
  • Materials For Medical Uses (AREA)
  • Special Wing (AREA)
US10/530,683 2002-10-09 2003-10-08 Self-locking osteosynthesis device Abandoned US20060116678A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US12/788,835 US8951291B2 (en) 2002-10-09 2010-05-27 Self-locking osteosynthesis device
US14/617,551 US20150150610A1 (en) 2002-10-09 2015-02-09 Self-locking osteosynthesis device

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0212534 2002-10-09
FR0212534A FR2845588B1 (fr) 2002-10-09 2002-10-09 Dispositif d'osteosynthese autobloquant
PCT/FR2003/002968 WO2004032751A2 (fr) 2002-10-09 2003-10-08 Dispositif d'osteosynthese autobloquant

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR2003/002968 A-371-Of-International WO2004032751A2 (fr) 2002-10-09 2003-10-08 Dispositif d'osteosynthese autobloquant

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/788,835 Continuation US8951291B2 (en) 2002-10-09 2010-05-27 Self-locking osteosynthesis device

Publications (1)

Publication Number Publication Date
US20060116678A1 true US20060116678A1 (en) 2006-06-01

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ID=32039568

Family Applications (3)

Application Number Title Priority Date Filing Date
US10/530,683 Abandoned US20060116678A1 (en) 2002-10-09 2003-10-08 Self-locking osteosynthesis device
US12/788,835 Active 2025-12-07 US8951291B2 (en) 2002-10-09 2010-05-27 Self-locking osteosynthesis device
US14/617,551 Abandoned US20150150610A1 (en) 2002-10-09 2015-02-09 Self-locking osteosynthesis device

Family Applications After (2)

Application Number Title Priority Date Filing Date
US12/788,835 Active 2025-12-07 US8951291B2 (en) 2002-10-09 2010-05-27 Self-locking osteosynthesis device
US14/617,551 Abandoned US20150150610A1 (en) 2002-10-09 2015-02-09 Self-locking osteosynthesis device

Country Status (10)

Country Link
US (3) US20060116678A1 (fr)
EP (1) EP1555943B1 (fr)
JP (1) JP4480581B2 (fr)
AT (1) ATE458450T1 (fr)
AU (1) AU2003299768B2 (fr)
CA (1) CA2501236C (fr)
DE (1) DE60331459D1 (fr)
ES (1) ES2341770T3 (fr)
FR (1) FR2845588B1 (fr)
WO (1) WO2004032751A2 (fr)

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FR2845588A1 (fr) 2004-04-16
ATE458450T1 (de) 2010-03-15
JP2006501914A (ja) 2006-01-19
ES2341770T3 (es) 2010-06-28
DE60331459D1 (de) 2010-04-08
WO2004032751B1 (fr) 2004-07-22
WO2004032751A3 (fr) 2004-05-21
JP4480581B2 (ja) 2010-06-16
AU2003299768B2 (en) 2008-07-03
EP1555943A2 (fr) 2005-07-27
US20150150610A1 (en) 2015-06-04
FR2845588B1 (fr) 2006-12-15
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AU2003299768A1 (en) 2004-05-04
CA2501236A1 (fr) 2004-04-22

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