EP2887892A1 - Ressort et dispositif de stabilisation d'os humains ou animaux - Google Patents

Ressort et dispositif de stabilisation d'os humains ou animaux

Info

Publication number
EP2887892A1
EP2887892A1 EP12751425.5A EP12751425A EP2887892A1 EP 2887892 A1 EP2887892 A1 EP 2887892A1 EP 12751425 A EP12751425 A EP 12751425A EP 2887892 A1 EP2887892 A1 EP 2887892A1
Authority
EP
European Patent Office
Prior art keywords
spring
bone
leg
hole
axis
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Withdrawn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
EP12751425.5A
Other languages
German (de)
English (en)
Inventor
Lorraine MONTAVON
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.)
Montavon Pierre M
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP2887892A1 publication Critical patent/EP2887892A1/fr
Withdrawn legal-status Critical Current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, 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
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7019—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other
    • A61B17/7026—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other with a part that is flexible due to its form
    • A61B17/7028—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other with a part that is flexible due to its form the flexible part being a coil spring
    • 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
    • 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
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A61B17/7011—Longitudinal element being non-straight, e.g. curved, angled or branched
    • 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
    • A61B17/7041—Screws or hooks combined with longitudinal elements which do not contact vertebrae with single longitudinal rod offset laterally from single row of screws or hooks
    • 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
    • A61B17/7059—Cortical plates

Definitions

  • the invention relates to a spring for stabilizing human or animal bones according to the preamble of patent claim 1, to a device for stabilizing human or animal bones according to the preamble of patent claim 11 and to a method for stabilizing long-bones or the spine according to the The preamble of claim 26.
  • a device for stabilizing the spinal column is known from the document WO 02/102259 SENGUPTA.
  • This known device comprises at least two pedicle screws, between the pedicle screws a spring element and at each pedicle screw a fixation mechanism for fixing the spring element to the pedicle screws.
  • the spring element has, at one end in each case, a substantially straight end piece and a central C-shaped or helical section arranged between the end pieces.
  • Sleeves are attached to the straight end pieces, which enlarge the outer diameter of the end pieces, so that the end pieces can be fixed in the pedicle screws.
  • the fixation mechanism consists of an open channel at the head of the pedicle screw for receiving an end piece of the spring element, a cap which is partially pushed over the head and the end piece, and a nut, by means of which the cap at the head of the pedicle screw and at the same time the end piece can be fixed in the channel. Since only minimal space conditions for the implant are given, especially in animals in the lumbo-sacral part of the spine, the voluminous training, in particular the fixation mechanism between the spring element and the pedicle screws of the present device is disadvantageous.
  • An implant for joint-like connection of two vertebral bodies is known from US-A 2005/209694 LOEB.
  • the preamble of claim 1 is based on this disclosure.
  • This known implant comprises a spring element with a straight end piece at each one end of the spring element and a central helical section.
  • the end pieces each have a slot for performing a Bone fixation element on.
  • the end pieces are rigidly connected to the central portion so that the bone fixation elements can not be angled relative to a plane defined by the central axis of the helical portion.
  • a disadvantage of this embodiment is therefore that the bone fixation elements can not be selectively fixed in the pedicles and / or the laminae of the vertebral bodies, whereby the possibilities for fixation of the implant to the vertebral bodies are considerably limited.
  • the invention aims to remedy this situation.
  • the invention has for its object to provide a spring and a device for stabilizing bones, which allows a translational and rotational movement of at least one bone plate relative to the spring of the device and thus the optional anchoring of the device by means of bone fixation elements, e.g. Bone screws in the laminae or in the pedicles of the vertebral body allows.
  • bone fixation elements e.g. Bone screws in the laminae or in the pedicles of the vertebral body allows.
  • the invention solves the stated object with a spring for stabilizing bone, having the features of claim 1, with a device for stabilizing bone, having the features of claim 11 and with a method for stabilizing long-bones or the spine, which having the features of claim 26.
  • the spring according to the invention can be made of a spring wire and a thread can be mounted directly on the spring wire.
  • an implant can be created with a minimal volume, so that the implant in the lumbo-sacral region of the spine, for example, can be attached by dogs, without restricting the movements of the animal.
  • a bone plate can be fastened by means of a simple threaded connection at least on one limb, whereby the entire implant can be shortened, lengthened or rotated by the translational and rotatable mobility of the bone plate relative to the spring, so that the position of the bone fixation element insertable into the plate hole of the bone plate ,
  • a bone screw after insertion of the implant can be selected by the surgeon.
  • the device can be shortened, extended or rotated by the translational and rotational mobility of at least one bone plate relative to the spring, so that the bone fixation elements can be anchored in a desired position optionally in the pedicles and / or in the laminae of the vertebral body.
  • the bone plates can not slip axially relative to the spring of the device even at high loads
  • the spring in the case of training as a leg spring comprises a preferred pivoting plane for the attached to the legs bone plates, so that the elastic resistance of the spring for a defined movement, e.g. Extension and flexion of the stabilized by the device vertebral body can be dimensioned, while for torsional or lateral bending of the vertebral body relative to each other considerably smaller or larger spring forces can act; and
  • the peripheral blade or lip may comprise one or more thread segments or, in an alternative embodiment, may be disposed in a plane perpendicular to the axis of the straight tail.
  • a plurality of peripheral fins or lips may be provided, which are arranged in a plurality of planes perpendicular to the axis of the straight end piece.
  • the first and the second leg may terminally comprise a straight, preferably circular-cylindrical end piece with a thread.
  • the spring coil has a variable pitch, which is preferably realized in only one turn of the spring coil.
  • the spring is made from a spring wire wound around a central axis of the spring coil, and at least one leg converges towards its free end with respect to a plane perpendicular to the central axis against the other leg.
  • at least one leg is angled relative to the other leg with respect to a plane perpendicular to the central axis.
  • variable pitch of one or both legs can be arranged so that the straight end pieces come to lie substantially in a narrow axial region of the central axis of the spring coil.
  • the bone fixation means used for fastening the spring to bone can thereby be arranged in close proximity to a plane perpendicular to the central axis of the spring coil, so that the spring coil is subjected to bending only in the sense of a turn and unintentional deformation of the spring coil can be prevented.
  • Suitable materials for the spring are:
  • the spring is made of a hollow spring wire.
  • the central fibers of the spring wire make no flexural rigidity or only a small contribution, so that the hollow design does not reduce the bending stiffness, but reduces its own weight.
  • the spring is made of a spring wire with a flattened in the spring coil, preferably rectangular cross-sectional area.
  • the advantage of this embodiment is the different bending stiffness of the spring wire in different directions.
  • the spring coil is designed as a conically wound spiral.
  • the spring is made of a spring wire with a wire axis and in the region of the first and second end piece of the first and second leg rectilinear portions of the wire axis close in a plane perpendicular to the central axis of the spring coil viewed an angle alpha, which in the unloaded Condition of the spring is between 135 ° and 225 °.
  • the advantage of this embodiment is that the end portions of the legs provided for attachment of the spring to the bone may be oriented in a position suitable for anatomy.
  • the leg spring is made of a spring wire with a diameter d between 2.0 mm and 4.0 mm, preferably between 3.3 mm and 3.7 mm.
  • the spring coil comprises a plurality of spring coils. Due to the larger number of spring coils, the leg spring can allow an increased relative movement of the vertebral bodies for the same load.
  • the spring coil is made of a spring wire with a wire axis, wherein the wire axis of the spring wire in the spring coil with a diameter D winds around the central axis, which is at least 12 mm, preferably at least 15 mm and typically 20 mm.
  • the spring coil is made of a spring wire with a wire axis, wherein the wire axis of the spring wire in the spring coil with a diameter D winds around the central axis, which is a maximum of 25 mm, preferably a maximum of 22 mm.
  • the invention further relates to a device for stabilizing bones in the human or animal body according to claim 11.
  • the first and / or second bone plate may comprise a cavity having an internal thread, which with the external thread at the end of the first and / or second leg is engageable.
  • Each of the two bone plates can be translationally and rotationally moved with respect to the longitudinal axis of the corresponding end piece to the spring.
  • the bone plates can therefore each independently be brought into a suitable position on a vertebral body.
  • the surgeon can therefore, just prior to attaching the bores for the fixation of the bone fixation elements in the bone, e.g. In the vertebral bodies, decide whether the bone fixation element in the cortex, e.g. anchored in the lamina or in a pedicle of a vertebral body.
  • the plate hole in the first and / or second bone plate has a hole axis and the longitudinal axis of the cavity is arranged perpendicular to the hole axis.
  • the device comprises a first and a second bone plate and additionally at least one clamping element with at least one hole for receiving a bone fixation fixation element and a channel for passing one of the two legs of the leg spring.
  • the advantage of this embodiment is that the legs of the spring are additionally attached to the bone surface, e.g. can be attached to a vertebral body, so that the leg spring can be secured against rotation.
  • the device may thus be attached to the bone, e.g. attached to the vertebral bodies, that even with large forces, as they can occur in running or jumping dogs, the bone screws are not torn.
  • At least one of the bone plates comprises a first section connected to an end piece of a leg at least one plate hole and a second portion having at least one plate hole, wherein the second portion is angled relative to the first portion.
  • the bone fixation elements can be optimally positioned with respect to the anatomy.
  • the plate hole in the first section has a hole axis and the second section is angled relative to a plane orthogonal to the hole axis.
  • the first and second sections can also be arranged planar
  • the clamping element is designed as a clip, so that the end piece of a leg can be snapped into the channel in the clamping element.
  • the terminal bone plates can first be fixed to the bone and then at appropriate locations the clamping elements located between the bone plates and the central part of the spring are fastened to or on the bone.
  • the spring is made of a different material from the bone plates.
  • the device according to the invention may also comprise bone screws.
  • the bone screws may each comprise a screw head, which may be lockable in a plate hole.
  • the device according to the invention serves for the stabilization of vertebral bodies or for the temporary stabilization of a joint.
  • a joint on which partial or complete abrasion of the colateral ligaments has taken place can be temporarily stabilized.
  • Another application for temporary stabilization of a joint is in the case of bone defects that result from the removal of a tumor.
  • the inventive device can be further used for the treatment of a fractured bone or for the treatment of arthrosis or pseudoarthrosis.
  • the device according to the invention can preferably be used on the knee joint or on finger joints.
  • the spring according to the invention can also be used to treat a fractured bone or osteoarthritis or nonunion, the spring being used for external fixation.
  • the spring may be attached to a plaster or attached to the bone externally by means of bone fixation elements in the form of an external fixator.
  • the invention also relates to a method for stabilizing a long-boned or spinal column comprising the steps of:
  • step i) involves the following additional steps:
  • a device according to the invention can be implanted.
  • FIG. 1 is a side view of an embodiment of the inventive device implanted on a lumbo-sacral spine portion of a dog viewed from lateral;
  • Figure 2 is a plan view of another embodiment of the devices of the invention implanted on a lumbo-sacral spine portion of a dog viewed dorsally;
  • Fig. 3 is a side view of an embodiment of the inventive spring
  • Fig. 4 is a plan view of the embodiment of the inventive spring after
  • FIG. 5 shows a side view of a bone plate according to the embodiment of the device according to the invention according to FIG. 1;
  • FIG. 6 shows a plan view of the bone plate according to the embodiment of the device according to the invention according to FIG. 1;
  • FIG. 7 shows a section through a clamping element according to the embodiment of the device according to the invention according to FIG. 2;
  • FIG. 8 shows a plan view of the clamping element according to the embodiment of the device according to the invention according to FIG. 2;
  • FIG. 9 is a plan view of a bone plate according to another embodiment of the device according to the invention.
  • FIG. 10 shows a side view of a bone plate according to yet another embodiment of the device according to the invention.
  • FIG. 11 shows a side view of a bone plate according to a further embodiment of the device according to the invention.
  • Fig. 12 is a view of another embodiment of the device according to the invention implanted on a long bone; and Fig. 13 is a plan view of a spring according to another embodiment of the inventive device.
  • FIG. 1 an embodiment of the device 1 according to the invention for the stabilization of the spinal column, e.g. of the last lumbar vertebral body 41 relative to the sacrum 42, e.g. a dog is shown, wherein each device 1 is arranged on one side of the spinous processes of the vertebral bodies.
  • Each of the two devices 1 comprises a spring 2 (FIGS. 3 and 4), which is designed as a leg spring 14 and includes at its end a first and a second leg 15 a, 15 b, a first bone plate 7 (FIGS. 5 and 5) arranged on the first leg 15 a 6) and a second bone plate 8 (FIGS. 5 and 6) arranged on the second leg 15b.
  • the first and second bone plates 7, 8 each have a plate hole 10 for receiving a bone fixation fixation element 11, so that the spring 2 by means inserted into the plate holes 10 of the first and second bone plates 7, 8 bone fixation elements 11, for example, on the last lumbar vertebrae 41 and Sakrum 42 can be attached.
  • the first and second legs 15a, 15b each include an end piece 5, 6, which is connected by means of a threaded connection 17 with one of the bone plates 7, 8.
  • the degree and type of compression of the spinal cord are diagnosed by an imaging examination.
  • the maximum extension and flexion of the vertebral column segment to be treated can subsequently be determined.
  • the dorsal, respectively posterior access is used for the insertion, positioning and fixation of the device.
  • a bilateral preparation of the epaxial musculature and a surgical preparation are preceded made the bony attachment points.
  • the lateral retraction of the muscle mass is produced by self-retaining retractors.
  • the pedicles, transverse processes and spinous processes are now exposed, allowing the fixation of the implant with bone fixation elements, preferably with bone screws of the necessary different angles relative to the device. Surgical decompression within the spinal canal is also possible. After fixation of the implant, the incision is closed again.
  • Fig. 2 shows an application of another embodiment of the inventive device 1 also in the lumbo-sacral region of the spine, which differs from the embodiment of FIG. 1 only in that each of the two devices
  • I additionally comprises in each case a clamping element 20 (FIGS. 7 and 8) which are fastened to each of the legs 15a, 15b and by means of a further bone fixation element
  • I I are fixed to the last lumbar vertebral body 41 and the sacrum.
  • the spring 2 is designed as a leg spring 14 and comprises a spring coil 30 wound around a central axis 16, a first end 3 and a second end 4.
  • the leg spring 14 is manufactured from a spring wire 31 and comprises a terminally arranged, preferably circular-cylindrical limb 15 a, 15b.
  • the spring coil 30 includes, for example, a spring coil.
  • the spring wire 31 may be circular-cylindrical and have a diameter d.
  • the wire axis 32 of the spring wire 31 is helically wound in the region of the spring coil 30 with a diameter D about the central axis 16 of the spring coil 30 and at the transitions to the legs 15a, 15b tangentially in each case a rectilinear portion in the region of the legs 15a, 15b ,
  • the torsion spring 14 is also referred to as helically wound bending springs, wherein a torque exerted on the legs 15a, 15b acts around the central axis 16 of the spring coil 30 as a substantially constant bending moment on the spring wire 31 in the entire area of the spring coil 30.
  • the legs 15a, 15b thus form levers, which can be rotated against the elastic resistance of the spring 2 relative to each other, so that the angle alpha is increased or decreased.
  • the spring wire 31 is bent inwardly or outwardly in the area of the spring coil 30.
  • the spring 2 is made of a material which is different from the first and second bone plates 7, 8 and may be made of a titanium alloy, preferably of TiAINb, a plastic, a ceramic material or nitinol. Further, the legs 15a, 15b at their end pieces 5, 6 each have a thread 12, so that the legs 15a; 15b of the spring 2 in a rigid manner to the first and second bone plates 7, 8 (FIGS. 5 and 6) are fixable.
  • the diameter d of the spring wire 31 may be between 2.0 mm and 4.0 mm. A typical value for the diameter d is 3.5 mm. In the area of the spring coil 30, the diameter D enclosed by the wire axis 32 of the spring wire 31 is typically 20 mm.
  • the spring coil 30 has a variable pitch, so that at the first and second ends 3, 4 of the spring 2, the wire axis 32 of the spring wire 31 is substantially in a plane perpendicular to the central axis 16 of the spring coil 30 level. It can thus be achieved that the straight end pieces 5, 6 of the first and second legs 15a, 15b come to lie essentially in a narrow axial area of the central axis 16 of the spring coil 30.
  • the first and second bone plates 7, 8 are parallelepiped-shaped and each comprise a top 34, a bottom 35, two long side surfaces 36a, 36b, and two short side surfaces 37a, 37b.
  • Each of the first and second bone plates 7, 8 comprises a plate hole 10, which penetrates the first, respectively second bone plate 7, 8 from the upper side 34 to the lower side 35.
  • each of the first and second bone plates 7, 8 comprises a cavity 18, which penetrates into the bone plate 7, 8 from a short side surface 37b.
  • the cavity 18 is formed as a blind hole with a hole axis 25 of the plate bore 10 perpendicular longitudinal axis 21 and has a to the external threads 12 at the end pieces 5, 6 of the legs 15 a, 15 b matching internal thread 13, so that each one of the first and second Bone plates 7, 8 can be fixed by means of a threaded connection 17 to an end piece 5, 6 of a leg 15a, 15b.
  • the first and second bone plates 7, 8 may be made of a biocompatible stainless steel, eg an austenitic stainless chromium-nickel-molybdenum steel, titanium or a titanium alloy, eg Ti-6Al-7Nb.
  • FIGS. 7 and 8 show an embodiment of the clamping element 20 (FIG. 2).
  • the clamping element 20 comprises a three-dimensional body 50, which is exemplified as a parallelepiped body with a top 51, a bottom 52 and four side walls 53a, 53b, 53c, 53d.
  • the clamping element 20 is formed as an elastic clip and comprises a three-dimensional body 50 penetrating plate hole 10 with a hole axis 25 and a three-dimensional body 50 also penetrating channel 22 with a helical to the hole axis 25 arranged channel axis 28.
  • the channel 22 is for receiving a leg 15a, 5b of the leg spring 14 suitable and comprises a circumferentially open against the bottom 52 of the clamping member 20 channel wall.
  • the hole axis 25 and the channel axis 28 are at a distance from each other, which is dimensioned so that plate hole 10 and the channel 22 does not penetrate.
  • the plate hole 10 penetrates the three-dimensional body 50 from its upper side 51 to the lower side 52, while the channel 22 penetrates the three-dimensional body 50 from a first side wall 53c to an opposite second side wall 53d.
  • the channel 22 narrows against the underside 52 of the clamping element 20 such that a leg 15a, 15b of a spring 2 can be snapped into the channel 22 from the underside 52 of the clamping element 20.
  • the spring 2 must be fixed by means of a further clamping element 20 on the spine, another clamping element 20, without this laboriously over the length of the legs 5a, 15b of the spring 2 to push, simply be placed on this. Furthermore, the spring 2 can be introduced into the human or animal body before the setting of the bone fixation elements 11, so that the positions of the bone fixation elements 11 to be subsequently fixed to the vertebral bodies are easy for the surgeon to determine.
  • FIGS. 5 and 6 differ from the embodiment shown in FIGS. 5 and 6 only in that the first and / or second bone plate 7, 8 next to a with a terminal piece 5, 6 of a leg 15 a, 15 b connectable first portion 23 with a plate hole 10, a second portion 24 having a plate hole 10, wherein the second portion 24 is angled relative to the first portion 23.
  • FIG. 9 shows an embodiment of the first and / or second bone plate 7, 8, in which the first and second sections 23, 24 are arranged planar.
  • the first and second sections 23, 24 are angled relative to one another such that the hole axis 25 of the plate hole 10 in the first section 23 and the hole axis 25 of the plate hole
  • the first and second sections 23, 24 against each other are angled that the hole axis 25 of the plate hole 10 in the first portion 23 and the hole axis 25 of the plate hole 10 in the second portion 24 against the bottom 35 of the first and / or second bone plate 7, 8 diverge.
  • the embodiments of the bone plates 7, 8 shown in FIGS. 9 to 11 are also suitable for the stabilization of spinal segments or of joints.
  • FIG. 12 shows an application of the inventive device 1 for treating a fractured bone.
  • a device 1 is arranged on the medial and on the lateral side of the fractured bone.
  • Each of the two devices 1 comprises a spring 2 whose first leg 15a is connected by means of a threaded connection 17 to a first bone plate 7, wherein the two first bone plates 7 are each fixed to the proximal bone fragment 43 with a respective bone fixation element 11.
  • the second legs 15b of the spring 2 are connected by means of a respective threaded connection 17 with a second bone plate 8, wherein the second bone plates 8, each with a bone fixation element 11 are attached to the distal bone fragment 44.
  • the springs 2 arranged on the medial and lateral sides of the bone fragments 43, 44 may have a different spring constant and, in addition, one or more clamping elements 20 ( Figures 7 and 8) may be attached to the springs 2.
  • the embodiment of the spring 2 shown in FIG. 12 differs from the embodiment shown in FIGS. 3 and 4 only in that the leg spring 14 formed spring 2 in its helical portion 30 comprises a plurality of spring coils.

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Neurology (AREA)
  • Surgery (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)
  • Surgical Instruments (AREA)
  • Prostheses (AREA)

Abstract

L'invention concerne un ressort (2) pour un dispositif (1) de stabilisation d'os, ce ressort étant conçu comme un ressort à branches (14) qui comporte une spirale (30) dotée d'au moins une spire et, en zone terminal, une première et une deuxième branche (15a, 15b) saillantes au-delà de la périphérie de la spire, au moins une branche comportant en zone terminale une pièce terminale (5, 6) en forme de tige présentant une structure tridimensionnelle (35) sous forme de filetage (12) ou de lamelle ou de lèvre périphérique. L'invention concerne également un dispositif (1) de stabilisation d'os comprenant a) un ressort (2); b) une plaque (7) pour fixation osseuse dotée de moyens permettant sa fixation à la structure tridimensionnelle (35) sous la forme d'un filetage (12) ou d'une lamelle ou lèvre périphérique ; et c) un élément de serrage (20) doté d'au moins un orifice (10) destiné à recevoir un élément de fixation osseuse (11), et un canal (22) destiné à l'insertion d'une des deux branches (15a, 15b) du ressort (2).
EP12751425.5A 2012-08-21 2012-08-21 Ressort et dispositif de stabilisation d'os humains ou animaux Withdrawn EP2887892A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CH2012/000195 WO2014029032A1 (fr) 2012-08-21 2012-08-21 Ressort et dispositif de stabilisation d'os humains ou animaux

Publications (1)

Publication Number Publication Date
EP2887892A1 true EP2887892A1 (fr) 2015-07-01

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EP12751425.5A Withdrawn EP2887892A1 (fr) 2012-08-21 2012-08-21 Ressort et dispositif de stabilisation d'os humains ou animaux

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US (1) US20150305779A1 (fr)
EP (1) EP2887892A1 (fr)
HK (1) HK1211825A1 (fr)
WO (1) WO2014029032A1 (fr)

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