WO2013086594A1 - Vis et plaque d'os bloqué comprenant une tête parabolique ou conique filetée et dispositif comprenant un implant et procédé d'introduction respectif dudit implant dans un tissu osseux - Google Patents

Vis et plaque d'os bloqué comprenant une tête parabolique ou conique filetée et dispositif comprenant un implant et procédé d'introduction respectif dudit implant dans un tissu osseux Download PDF

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Publication number
WO2013086594A1
WO2013086594A1 PCT/BR2012/000493 BR2012000493W WO2013086594A1 WO 2013086594 A1 WO2013086594 A1 WO 2013086594A1 BR 2012000493 W BR2012000493 W BR 2012000493W WO 2013086594 A1 WO2013086594 A1 WO 2013086594A1
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WO
WIPO (PCT)
Prior art keywords
bone
plate
screw
implant
conic
Prior art date
Application number
PCT/BR2012/000493
Other languages
English (en)
Inventor
Irineu VITOR LEITE
Original Assignee
Neoortho Produtos Ortopédicos
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 Neoortho Produtos Ortopédicos filed Critical Neoortho Produtos Ortopédicos
Publication of WO2013086594A1 publication Critical patent/WO2013086594A1/fr

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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
    • A61B17/84—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
    • A61B17/8625—Shanks, i.e. parts contacting bone tissue

Definitions

  • the present invention relates to the field of medical apparatuses, more particularly the devices used in orthopedic treatment - implants, more specifically a blocked bone plate, aimed for the treatment of bone fractures, wherein its association with conic- or parabolic-headed screws permits screw micro movements, thus speeding up bone consolidation.
  • Implants are devices inserted into human body to perform the functions of some biological structure missing or with its functioning impaired.
  • the bone-plate-screw system should allow restoring member mechanical axle alignment, and restoring articular congruence to less than 2 mm deviation.
  • the first bone plates to be manufactured were the conventional fixture plates that might function as fixed systems only under optimal circumstances. These plates had simple bore holes housing a screw and compressing the plate towards the bone.
  • the dynamic compression plate had a bore hole design allowing axial compression by screw eccentric insertion.
  • the plate functions in different ways: compression, neutralization, tension band, or as a support. Since during the use of dynamic compression plate and conventional plate there was the compression between plate and bone, periosteum capillary network was too harmed, leading to a relative worsening of cortical perfusion. So, dynamic compression bone plates were invented, with limited contact, which is an evolution from DCPs, where the area of contact plate-bone (the plate "gripping") is gradually reduced.
  • Blocked plates allow the insertion of screws or smooth pins with stable fixed angle. Screw bore holes had a threading allowing connection with the plate working as a fixed angle device.
  • osteosynthesis should facilitate fragment micro movements if fracture healing during second stage is desired.
  • articular congruence and axial and rotational positions should be maintained.
  • movement inside callus should be limited, which is naturally achieved by increased callus ossification rigidity.
  • a blocked bone plate is a plate which, when affixed to a fractured bone, provides support and/or stabilizes a fracture.
  • implant rigidity contributes to reduce fracture mobility.
  • the absolute stability reduces tension in fracture so as to allow straight consolidation without visible calluses.
  • the nature of fixture in such a conic or parabolic head screw into an orthogonal bore hole is advantageous because it allows these fixture elements to perform micro movements that stimulate said bone consolidation.
  • US patent 20040006346 describes a screw implant for insertion into a bore hole arranged in bone tissue, said implant having a cancellous portion, and a cortical portion having an axial length such that, when installed in the bore hole, the engagement of said cortical portion with the bone tissue will generally be confined to the cortical bone tissue layer.
  • it presents screws provided with a conic head, however threaded in an also conic bore hole, differently from the proposed invention.
  • US application 20100185246 reveals bone screws having heads which are provided with a hex socket as well as a threaded portion, allowing driving the screw through a plate system into a bone until desired compression is obtained. In an alternative embodiment, it protects blocking screws provided with a threaded conic head; however not associated to orthogonal bore holes, thus having none of the characteristics featured by the present invention.
  • US document 5002544 presents an osteosynthetic pressure plate having several holes for bone screws positioned along its longitudinal axis and having an underside with curved recesses, designed for positioning on the bone so that immediately upon implantation there are spaces between the bone and the pressure plate.
  • the invention EP 1949866 describes an orthopedic bone implant and, more particularly, orthopedic bone plates having screw receiving apertures formed therein.
  • the implant includes an aperture defined by an interior threaded portion configured to engage the head of a bone screw.
  • Such protection discloses bone plates provided with blocking screws with threaded conic head, but not threaded with orthogonal bore holes, thus not featuring the characteristics proposed by the present invention.
  • Fig. 1 shows side views of the screw provided with conic or parabolic head (1), wherein the distinction between conic or parabolic head threading (1) and fixation axle threading (2) is noticed.
  • Fig. 2 reveals a section view of the blocking screw (4) in bone plate (5), wherein the interaction (3) between screw head and bone plate and screw's long body (4) detaching from bone plate (5) is noticed.
  • Fig. 3 depicts a detail of screw head (1) threaded to the bone plate (5) and the interaction (3) between screw head and bone plate.
  • Fig. 4 depicts a detail of the interaction between screw threading (1) with a conic or parabolic head and the plate, when inserted thereto.
  • Figs. 5A and 5B show a section view of the sequence of oscillation movements that the screw with a conic or parabolic head may perform when implanted.
  • the present invention aims at solving various existing problems in current technique by providing implant users with notable advantages to be detailed below, through an arrangement comprising a bone implant and method for inserting said implant into a bone tissue, thus allowing screw micro movements that speed up bone consolidation.
  • a blocked bone plate provided with screws having conic or parabolic head to be threaded to an orthogonal bore hole (in a right angle) in the plate, aimed for treating fractures in any part of the skeleton.
  • a blocked bone plate allows micro movements resulting in screw (4) micro flexible fixation by interacting elements with different profiles, thus reducing tutor rigidity (i.e. the system that is directed to assist, restrict, align, or simulate the function of a body part, in this case, the plate-screw system), thus promoting a small relative stability in an inner fixation system.
  • the screw (4) with conic or parabolic head (1) does not interact in the whole extension with plate orthogonal bore hole (5).
  • the threading, although compatible, does not match the same way all over the longitudinal extension, since the different profiles are distant from each other, as seen in Fig. 3.
  • the parabolic profile (1) of the screw head (4) provides an interaction zone for fixation only in the upper part, as depicted in Fig. 3.
  • the remainder of screw body is "loose" inside plate bore hole cavity (5) due to the walls growing distant as the conic or parabolic head (1) diameter diminishes.
  • the recesses located in plate inner surface (5), that are in contact with the bone, surrounding the bore hole, allow more space for screw movements (4), thus allowing more micro movements in screw body (4).
  • the plate besides having blocked bore holes, is also provided with dynamic compression bore holes of limited contact, allowing both the use of a conventional screw and a blocked screw. This combination reflects the medical need of more flexibility in plate osteosynthesis, i.e., depending on fracture condition the conventional technique can be applied; compression technique, bridge compression method, inner fixture principle, or a combination of both principles.
  • the plate is characterized by the fact that inner jacket surface is orthogonal, i.e., a threaded bore hole with a right angle, with parallel walls.
  • the screw (4) is characterized by 2 regions: region 1 having a head a threaded with parabolic profile, said head having its diameter diminished as the threading advances screw body; such region 1 is blocked in plate orthogonal bore hole.
  • region 2 the screw threading is affixed to the bone, which is best understood by seeing Fig. 1.
  • the threading in region 1 has a conic or parabolic outer surface in an angle "A” ranging from 2° to 25° and a conic or parabolic inner surface in an angle "B” ranging from 2° to 25°, as shown in detail in Fig. 2.
  • the screw is blocked to the plate by using a controlled torque varying according to threading measures.
  • the screw is locked in one of the bore hole upper threads, thus keeping bore hole lower region from contacting screw threading, and allowing the space necessary for micro movements, as seen in Fig. 3.

Landscapes

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

Abstract

L'invention concerne une plaque d'os bloqué, comprenant des orifices percés orthogonaux, associés synergiquement à des vis avec une tête parabolique ou conique, vissées dans lesdits orifices percés orthogonaux de la plaque, appropriée pour le traitement de fractures sur une partie du squelette qui, une fois fixée à un os fracturé, stabilise la fracture. La nature de fixation d'une telle tête parabolique ou conique dans un orifice percé orthogonal est avantageuse car elle permet à ces éléments de fixation d'exécuter des micromouvements qui stimulent ladite consolidation de l'os.
PCT/BR2012/000493 2011-12-13 2012-12-04 Vis et plaque d'os bloqué comprenant une tête parabolique ou conique filetée et dispositif comprenant un implant et procédé d'introduction respectif dudit implant dans un tissu osseux WO2013086594A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BRPI1107336 BRPI1107336A2 (pt) 2011-12-13 2011-12-13 placa osso bloqueada e parafuso dotado de cabeÇa cânica ou parabàlica rosqueÁvel e seu arranjo compreendendo um implante e respectivo mÉtodo de inserÇço do dito implante em tecido àsseo
BRPI1107336-5 2011-12-13

Publications (1)

Publication Number Publication Date
WO2013086594A1 true WO2013086594A1 (fr) 2013-06-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BR2012/000493 WO2013086594A1 (fr) 2011-12-13 2012-12-04 Vis et plaque d'os bloqué comprenant une tête parabolique ou conique filetée et dispositif comprenant un implant et procédé d'introduction respectif dudit implant dans un tissu osseux

Country Status (2)

Country Link
BR (1) BRPI1107336A2 (fr)
WO (1) WO2013086594A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BRPI0606073A (pt) * 2006-09-21 2008-05-13 Biomecanica Ind E Com De Produ sps - fb sistema de fixação de parafusos em placas ósseas
EP1949866A2 (fr) * 2007-01-26 2008-07-30 Zimmer Technology, Inc. Lame osseuse fournissant une capture de tête de vis à verrouillage fileté
WO2010115403A1 (fr) * 2009-04-07 2010-10-14 Merete Medical Gmbh Dispositif de fixation à stabilité angulaire et de compression d'un foyer de fracture ou d'une ostéotomie sur un os
DE102010038949A1 (de) * 2010-08-05 2012-02-09 Dieter Marquardt Medizintechnik Gmbh Osteosynthesevorrichtung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BRPI0606073A (pt) * 2006-09-21 2008-05-13 Biomecanica Ind E Com De Produ sps - fb sistema de fixação de parafusos em placas ósseas
EP1949866A2 (fr) * 2007-01-26 2008-07-30 Zimmer Technology, Inc. Lame osseuse fournissant une capture de tête de vis à verrouillage fileté
WO2010115403A1 (fr) * 2009-04-07 2010-10-14 Merete Medical Gmbh Dispositif de fixation à stabilité angulaire et de compression d'un foyer de fracture ou d'une ostéotomie sur un os
DE102010038949A1 (de) * 2010-08-05 2012-02-09 Dieter Marquardt Medizintechnik Gmbh Osteosynthesevorrichtung

Also Published As

Publication number Publication date
BRPI1107336A2 (pt) 2013-02-26

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