WO2001050967A1 - Vis pediculaire amelioree - Google Patents

Vis pediculaire amelioree Download PDF

Info

Publication number
WO2001050967A1
WO2001050967A1 PCT/BR2001/000004 BR0100004W WO0150967A1 WO 2001050967 A1 WO2001050967 A1 WO 2001050967A1 BR 0100004 W BR0100004 W BR 0100004W WO 0150967 A1 WO0150967 A1 WO 0150967A1
Authority
WO
WIPO (PCT)
Prior art keywords
thread
improved
expansible element
fact
screw
Prior art date
Application number
PCT/BR2001/000004
Other languages
English (en)
Inventor
Vera Lúcia CAMARGO PAES
Original Assignee
Camargo Paes Vera Lucia
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 Camargo Paes Vera Lucia filed Critical Camargo Paes Vera Lucia
Publication of WO2001050967A1 publication Critical patent/WO2001050967A1/fr

Links

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
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
    • A61B17/7034—Screws or hooks with U-shaped head or back through which longitudinal rods pass characterised by a lateral opening
    • 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
    • A61B17/686—Plugs, i.e. elements forming interface between bone hole and implant or fastener, e.g. screw
    • 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
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass

Definitions

  • IPROVED PEDICULAR SCREW This report refers to an improved pedicular screw, of the type that is utilized in the composition of prosthesis intended to use in the vertebral column.
  • the vertebral column is classically subdivided in three segments, namely, a) anterior segment - composed by the anterior half of the vertebral body, anterior half of the intervertebral disk and longitudinal ligament; b) medium segment - composed by the posterior half of the vertebral body, posterior half of the intervertebral disk and posterior longitudinal ligament; and c) posterior segment - composed by the articular facets, yellow ligament, interspine ligament and supraspine ligament.
  • segmental instability of the vertebral column the situation in which the column, under load or strain within physiological limits presents displacements that produce in the patient a clinical status of pain, sensitive alterations and/or lesion of nervous structure or of its wrappings.
  • Such systems composed of sets of screws of different diameters and of different lengths, through the particular surgical technique, are surgically inserted in the vertebral pediculum (from where arises its denomination of pedicular screw) , until one reaching the medium and anterior segments of the vertebral body.
  • segmental stabilization of column with pedicular screws use a minimum number of four screws, that united through bars, generally with circular cross section, promote the fixing of the segmental portion (s) in which they were utilized.
  • the immobilization with the reestablishing of the height between the different anatomical structures as well as the mechanical help arisen of the resistance of the materials utilized in the prosthesis try to transform an unstable segment to a situation of an stable column segment.
  • the systems currently available and pertaining to the state of the art feature a series of inconveniences and/or limitations, among which may be mentioned: a) necessity of the previous preparation of the bone (milling) in the bone wall that will receive the pedicular screw; b) difficulty in the correct anatomical positioning of the pedicular screw, represented by the placing of the same in incorrect angling relative to the anatomic structure of the vertebral pediculum and its relations with the anterior and medium segments of the vertebral bodies and of the nervous structures; c) due to the characteristics of the type of thread of the currently used screws, the grip to the bone structures surrounding the screw, when submitted to the traction forces, show a tendency to get loose; d) the upper part of the existing screws, specially designed to receive the stabilizing bar, due to its design
  • the inconveniences verified in the constructivity adopted by the conventional pedicular screws are also in the fact that the orifice to be made in the vertebral body of the patient must be elaborated very meticulously, under penalty of not obtaining a perfect anchoring of said screw in the structure of the vertebra.
  • Another objective of this patent of invention is in providing an improved pedicular screw that, in function of its particular constructivity, is not subject to the negative points verified in the state of the art .
  • an improved pedicular screw that has the following characteristics; a) to include in its constructivity a configuration that features a self-cutting thread, that dispenses the need of previous preparation (milling) of the bone wall that will be utilized as a bed for the same, said self-cutting thread, further features the advantage of not contributing (because of the fact of making unnecessary the previous preparation of the bone bed) to not have loss of bone substance; b) to be said screw now proposed provided of an internal orifice that permits that the same be fixed with the help of guiding string/wire, facilitating in this manner its correct placing relative to the different related anatomical structures; c) to have part of its structure provided with expansible means, what allows the obtainment of a substantially high fixing level, of what results, for example, that in being submitted to the forces of traction, load and moments of strain, the screw herein proposed do not present a tendency to get loose; and d) the cap of the screw is not part of the following characteristics; a) to include in its constructivity a configuration that features a
  • the figure 1 illustrates a lateral and exploded view of the herein-proposed screw, which view demonstrates its main components
  • the figure 2 illustrates an orthogonal view taken of the figure 1, that demonstrates other details of the improved pedicular screw herein mentioned
  • the figure 3 illustrates a view in schematic cut that is taken of the figure 1, such as the one indicated by the "A" arrow
  • the figure 4 illustrates of view of the threaded pin that is utilized to promote the immobilization of the metallic stem near to the head of fixing of this improved pedicular screw, said view being taken pursuant to the indication of the arrow "B" of figure 2
  • the figure 5 illustrates a view of the vertebral column, more particularly of its lumbar region, where it is exemplified the use of a pair of the
  • the improved pedicular screw is characterized by a principal body 1, that serves as a place for the anchoring of a stem or rigid bar 2, that may be better observed through the figure 5, where due to a merely illustrative matter is demonstrated only one of the two sets normally utilized and that are formed by a pair of the subject screws, and, of course, of the corresponding bar 2.
  • the principal body 1 of the improved pedicular screw is composed by a fixing head 3, that is developed into a spindle 4, said fixing head 3 features an arched lateral opening 5, that finishes in a rounded wall 6, place where one of the extremities of the rigid bar 2 will rest, such as demonstrated in the figures 1 and 6.
  • the expansible element 10 features an essentially tubular shape, incorporating in its external face 11 a thread string/wire 12 with self-cutting characteristics, namely, being said thread string/wire 12 constructively defined so that the expansible element 10, when being threaded in the orifice 18 produced in the vertebral body 20, opens a way into the bone mass that constitutes its laying bed 21, such as schematically demonstrated in the figure 6.
  • the expansible element 10 features at least a pair of longitudinal slits 13, that guarantee the expansible effect of the same.
  • the expansible element 10 features a central orifice 14, that relies on an internal thread 15, that originating in the extremity of the same, extends itself by approximately two thirds of its total length.
  • the internal thread 15 is dimensioned and defined so as to establish the connection with the thread 9 of the spindle 4 of the principal body 1, being that referred thread 15, in the extreme region of the expansible element 10 develops itself into an other segment of thread 15a, that is specifically intended to be connected with the thread 8 located in the interior extremity 7 of the fixing head 3, supplementally reinforcing the mechanical resistance of the present improved pedicular screw, after this being entirely mounted, such as the one illustrated in figure 6.
  • the herein treated improved pedicular screw is formed further by a threaded pin 16, that is utilized to proceed the immobilization of the rigid stem 2, being this latter duly positioned in the desired point near the wall 6 of the lateral opening 5 of the fixing head 3, said threaded pin 16 may be positioned in a threaded orifice 17 that is incorporated in the upper region of the fixing head 3 and reaches the mentioned lateral opening 5, such as illustrated in figures 1 and 2.
  • the subject pedicular screw proves itself more efficient than those pertaining to the state of the art.
  • the improved pedicular screw is effectively mounted through a preliminary stage that is represented by the elaboration of an orifice 18, that crosses the pediculum 19 of the vertebral body 20, thus defining the bed 21, that reaches the vicinities of its central region 22.
  • the orifice 18 Made the orifice 18, it is effected the positioning of the expansible element 10, what occurs through the rotation of the same, and due to the action of its thread 12, that being of the self-cutting type, opens way in the bed 21 and threads itself along the wall of said orifice 18.
  • the expansible element being positioned 10 it is effected the mounting of the principal body 1, that is then threaded in the expansible element 10, being that, as the spindle 4 advances along the orifice 14, one determines as consequence the expansion of the element 10, which factor further guarantees the rigidity of the mounting of this improved pedicular screw near to the vertebral body 20.
  • the bar 2 having been mounted this may be then firmly trapped and immobilized through the already mentioned threaded pin 16, of each one of the fixing heads 3.
  • This constructivity presents three main advantages relative to the conventional system, being the first of them represented by the greater efficiency in the anchoring of the thread near to the structure of the vertebral body 20, particularity that is obtained by the utilization of the expansible element 10; the second advantage concerns that fact that due to the anticipation and use of said expansible element 10, the strictness in the elaboration of the orifice 18 becomes less necessary and dispenses the stage of milling, that is, it is admitted a greater tolerance in the execution of said orifice 18, since the final anchoring effect is provided by the expansion of the element 10 after this latter being entirely positioned in said orifice 18; and the third main advantage of this constructivity is in the greater freedom for the positioning of the fixed stem 2, which freedom is resulting of the configuration of the fixing head 3 and more particularly is arisen of the provision and configuration of said lateral opening 5 of said fixing head
  • the figure 7 illustrates in a partially cut manner a construction variant of the expansible element 10 that in this case is specially indicated by the reference 10a.
  • the said expansible element 10a is characterized by the fact of featuring an essentially tubular shape, incorporating in its external face 11a a thread string/wire 12a with self-cutting characteristics, such as the one presented by the expansible element 10.
  • the expansible element 10a in a manner similar to that verified in the expansible element 10, relies on at least a pair of longitudinal slits 13a, that guarantee the expansible effect of the same.
  • the expansible element 10a also features a central orifice 14a that has an internal thread 15a, that starting in the extremity of the same extends itself by roughly two thirds of its total length.
  • the internal thread 15a is dimensioned and defined so as to establish the connection with the thread 9 of the spindle 4 of the principal body 1, such as it occurs with the expansible element 10, being that said thread 15a, in the extreme region of the expansible element 10a develops in another segment of thread 15a 1 , that is specifically intended to be connected to the thread 8 located in the lower extremity 7 of the fixing head 3.
  • the corresponding slits 13a start from the vicinities of the region where internally the threads 15a and 15a' interconnect themselves, being that said slits 13a reach the anterior extremity of the element 10a, which, as a consequence, is configured in an open manner.
  • Figures 8 and 9 show another embodiment of the present pedicular screw which is characterized by the fact the use of the expansible element 10 is no more required.
  • FIG. 9 Another novelty aspect which is better depicted in Figure 9 is the fact that the body of the present screw shows an inner channel C which turns the screw into a cannular piece .

Landscapes

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

Abstract

L'invention concerne une vis pédiculaire constituée d'un corps principal (1) doté d'une tige (4) susceptible d'être vissée dans un élément extensible (10) positionné au préalable dans un orifice (18) produit dans un corps vertébral (20), délimitant le lit (21) de celui-ci . Le corps principal (1) comporte une tête de fixation (3) qui favorise, au moyen d'une broche filetée (16), l'immobilisation d'une barre rigide (2) prévue contre une paroi (6) de la tête de fixation (3), comprenant une ouverture latérale (5).
PCT/BR2001/000004 2000-01-13 2001-01-11 Vis pediculaire amelioree WO2001050967A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BR0000275A BR0000275C1 (pt) 2000-01-13 2000-01-13 Parafuso pedicular aperfeiçoado
BRPI0000275-5 2000-01-13
BRCI0000275-2 2001-01-08

Publications (1)

Publication Number Publication Date
WO2001050967A1 true WO2001050967A1 (fr) 2001-07-19

Family

ID=3943412

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BR2001/000004 WO2001050967A1 (fr) 2000-01-13 2001-01-11 Vis pediculaire amelioree

Country Status (2)

Country Link
BR (1) BR0000275C1 (fr)
WO (1) WO2001050967A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005079685A1 (fr) * 2004-02-23 2005-09-01 Synthes Ag Chur Vis osseuse
EP1681982A2 (fr) * 2003-10-14 2006-07-26 Thomas R. Keyer Crochets de fixation vertebrale et methode de fixation vertebrale
WO2006104709A2 (fr) 2005-03-24 2006-10-05 Depuy Spine, Inc. Procedes et dispositifs destines a stabiliser un element d'ancrage osseux
EP2228015A3 (fr) * 2009-03-09 2011-03-02 Stout Medical Group, L.P. Dispositif de fixation et procédés d'utilisation, de préparation et de test

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2713473A1 (fr) * 1993-12-13 1995-06-16 Caffiniere De Jean Yves Matériel d'ostéosynthèse vertébrale postérieure par barre transversale inter-pédiculaire.
US5603714A (en) * 1993-12-15 1997-02-18 Mizuho Ika Kogyo Kabushiki Kaisha Instrument for anterior correction of scoliosis or the like
US5741254A (en) * 1993-04-19 1998-04-21 Stryker Corporation Implant for an ostheosynthesis device, in particular for the spine
WO1998025534A1 (fr) * 1996-12-12 1998-06-18 Synthes Ag Chur Dispositif pour relier un support longitudinal avec une vis pediculaire
US5964761A (en) * 1997-07-15 1999-10-12 Kambin; Parviz Method and instruments for percutaneous arthroscopic disc removal, bone biopsy and fixation of vertebrae

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5741254A (en) * 1993-04-19 1998-04-21 Stryker Corporation Implant for an ostheosynthesis device, in particular for the spine
FR2713473A1 (fr) * 1993-12-13 1995-06-16 Caffiniere De Jean Yves Matériel d'ostéosynthèse vertébrale postérieure par barre transversale inter-pédiculaire.
US5603714A (en) * 1993-12-15 1997-02-18 Mizuho Ika Kogyo Kabushiki Kaisha Instrument for anterior correction of scoliosis or the like
WO1998025534A1 (fr) * 1996-12-12 1998-06-18 Synthes Ag Chur Dispositif pour relier un support longitudinal avec une vis pediculaire
US5964761A (en) * 1997-07-15 1999-10-12 Kambin; Parviz Method and instruments for percutaneous arthroscopic disc removal, bone biopsy and fixation of vertebrae

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1681982A2 (fr) * 2003-10-14 2006-07-26 Thomas R. Keyer Crochets de fixation vertebrale et methode de fixation vertebrale
EP1681982A4 (fr) * 2003-10-14 2008-08-13 Synthes Gmbh Crochets de fixation vertebrale et methode de fixation vertebrale
WO2005079685A1 (fr) * 2004-02-23 2005-09-01 Synthes Ag Chur Vis osseuse
KR101085711B1 (ko) 2004-02-23 2011-11-21 신세스 게엠바하 뼈 스크류
US8162998B2 (en) 2004-02-23 2012-04-24 Synthes Usa, Llc Bone screw
WO2006104709A2 (fr) 2005-03-24 2006-10-05 Depuy Spine, Inc. Procedes et dispositifs destines a stabiliser un element d'ancrage osseux
EP1876980A2 (fr) * 2005-03-24 2008-01-16 DePuy Spine, Inc. Procedes et dispositifs destines a stabiliser un element d'ancrage osseux
EP1876980A4 (fr) * 2005-03-24 2009-12-02 Depuy Spine Inc Procedes et dispositifs destines a stabiliser un element d'ancrage osseux
EP2228015A3 (fr) * 2009-03-09 2011-03-02 Stout Medical Group, L.P. Dispositif de fixation et procédés d'utilisation, de préparation et de test

Also Published As

Publication number Publication date
BR0000275C1 (pt) 2001-09-18
BR0000275A (pt) 2001-08-14

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