US20100114169A1 - Flexible linking piece for stabilising the spine - Google Patents
Flexible linking piece for stabilising the spineDownload PDFInfo
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- US20100114169A1 US20100114169A1US12/606,901US60690109AUS2010114169A1US 20100114169 A1US20100114169 A1US 20100114169A1US 60690109 AUS60690109 AUS 60690109AUS 2010114169 A1US2010114169 A1US 2010114169A1
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- anchor
- wall
- rigid
- rigid portion
- connecting body
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- 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
- A61B17/70—Spinal positioners or stabilisers, e.g. 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
- A61B17/7031—Longitudinal elements having flexible parts, or parts connected together, such that after implantation the elements can move relative to each other made wholly or partly of flexible material
- 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
- A61B17/70—Spinal positioners or stabilisers, e.g. 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
- A61B17/7004—Longitudinal elements, e.g. rods with a cross-section which varies along its length
- 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
- A61B17/70—Spinal positioners or stabilisers, e.g. 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
- This disclosurerelates to a connecting member for maintaining the spacing between at least two anchor members which are interconnected by said connecting member.
- Systems for stabilizing the vertebral column by bracing at least two consecutive vertebrae by means of anchor members fixed into said vertebrae and connected by rigid connecting rodsare well known in the art.
- Systems of this kindare generally coupled systems such that two consecutive vertebrae are interconnected by two substantially parallel rods fixed one on each side of the spinous processes.
- the anchor membersare screwed into the posterior portions of the vertebrae and pass through the pedicles and a substantial portion of the vertebral bodies and therefore provide a fixed and durable connection.
- the above stabilizing systemsare routinely used to consolidate several consecutive vertebrae.
- the vertebraeare interconnected by rigid rods over a substantial length of the vertebral column.
- Such assemblieshold the vertebrae correctly relative to each other; however, they considerably stiffen the spine in terms of bending. It has been shown that a more flexible stabilizing system, which confers greater relative mobility on the vertebrae, is beneficial in some pathologies.
- a first object of embodiments described hereinis to provide a connecting member for maintaining the spacing of existing anchor members while at the same time allowing relative mobility of said anchor members.
- a connecting member in accordance with one embodimentadapted to maintain the spacing between at least two anchor members screwed into vertebrae, comprises at least two rigid rod-forming parts made of a first material and each having a fixing, first portion adapted to be fixed into an anchor member and a fastening, second portion, said rods being aligned with each other and said fastening portions facing each other, and a connecting body that is made entirely from a second material that is more elastically deformable than said first material and interconnects the facing fastening portions of said rigid parts so that said connecting body is able to deform elastically, whereby the vertebrae, which are held spaced from each other, are movable relative to each other.
- a feature of the connecting memberlies in the way the two rigid parts are fastened together by means of an elastically deformable connecting body which imparts relative mobility to the rigid parts when under stress, with the reaction force to the stress being proportional, within certain limits, to the deformation of the connecting body.
- the connecting membercan be bent by stresses in directions that are not parallel to the axis of the connecting member; it can also be stretched or contracted by opposing forces acting parallel to the axis of the connecting member.
- the two anchor memberswhen at rest, are interconnected by the connecting member with its fixing portions fastened to the anchor members, and can be moved relative to each other by forces proportional to the movement.
- Said rigid partsare preferably mechanically connected together by a single connecting body providing the whole of said mechanical connection.
- a single memberprovides the connection between the rigid parts at the same time as controlling relative movement of the rigid parts.
- said connecting bodyconsists entirely of a single second material to simplify assembly and to impart homogeneous mechanical properties to it.
- the connecting member of an embodimenthas n rigid parts with n ⁇ 1 connecting bodies disposed between them along the longitudinal axis of said member, each rigid part situated between two connecting bodies having one fixing, first portion and two fastening, second portions, there being one fastening, second portion at each end of said fixing, first portion, and said fastening, second portions being connected respectively to said two connecting bodies, and the rigid parts at the two ends of said member advantageously have respective single fastening, second portions connected to the connecting bodies, whereby said connecting member is adapted to interconnect n anchor members.
- the connecting membermaintains the spacing between all the anchor members that it interconnects, each of which can be fixed to a respective vertebra, to align them.
- Each rigid partis fixed to an anchor member and, between successive anchor members, there is a connecting body that interconnects the two fastening portions.
- a single connecting memberstabilizes several vertebrae, which reduces the time to assemble the stabilizing system as a whole and consequently the operating time.
- the connecting memberstabilizes several consecutive vertebrae by connecting them together, while at the same time making them highly flexible and conferring on them a high degree of relative compressibility in the longitudinal direction.
- each of said fastening portions of said rigid parts that said connecting body interconnectshas a fastening wall to which said connecting body is adapted to adhere.
- said fastening wallhas openings adapted to cooperate with asperities on said connecting body to increase the surface area of contact between said wall and said body.
- providing openings in a wallincreases the surface area of that wall, which increases the contact area between the two materials if one of the materials can be molded onto the wall of the other material.
- the increase in contact areaincreases the connecting forces between said connecting body and said fastening portions.
- the static friction forces of the material of the connecting member on said two membersare increased in a corresponding manner and these forces are added to the connecting forces.
- Said second material of which said connecting body is madeis advantageously obtained by polymerization.
- the connecting bodycan easily be hot molded onto the fastening walls if the material is polymerized beforehand, or it can be formed in situ if the rate of polymerization of the monomers constituting said second material is sufficiently low to provide the time necessary for completing the assembly.
- said first material of which said rigid parts are madeis a titanium alloy. It is therefore easy to form openings in said fastening wall to which said connecting body is able to adhere.
- the section of said rigid rod-forming partsis circular, which facilitates the manufacture of the member. Also, if prior art circular section connecting rods are to be replaced by connecting rods described herein without making it necessary to replace the anchor members, it is necessary for said rigid parts to have sections identical to the sections of the prior art connecting rods.
- the present disclosurealso provides a vertebral stabilization system for fastening together at least two vertebrae each having a median plane substantially perpendicular to the axis of the spine of which they form a part and a posterior wall defining a posterior median plane of said spine, said system comprising at least two anchor members each adapted to be fixed into the posterior wall of a respective vertebra so that a line which intersects said two anchor members is substantially parallel to said axis of the spine, which system further comprises at least one connecting member whose two rigid parts are adapted to interconnect said two anchor members so that the axis of said connecting member is substantially parallel to said axis of the spine, whereby said vertebrae, which are interconnected via their posterior portions, present relative mobility along said axis of said spine.
- FIG. 1is a diagrammatic perspective view of a connecting member in accordance with an embodiment
- FIG. 2is a diagrammatic view in axial section of the connecting member in accordance with an embodiment
- FIG. 3is a perspective view showing anchor members connected by the connecting member
- FIG. 4is a side elevation view of a vertebral column showing two consecutive vertebrae into which there are screwed anchor members interconnected by a connecting member in accordance with an embodiment
- FIG. 5is a perspective view showing a connecting member having two connecting bodies and three rigid parts.
- the connecting member 10has two cylindrical rigid parts 12 and 14 .
- Each rigid part 12 , 14has a fixing, first portion 16 , 18 and a fastening, second portion 20 , 22 forming an enlargement.
- the facing fastening portions 20 and 22are connected together by a connecting body 24 so that the rigid parts 12 and 14 are in axial alignment.
- the connecting member 10is therefore circularly symmetrical about the axis A.
- the connecting body 24is a plastics material body obtained by polymerization.
- the material of the bodyis chosen from materials which are more elastically deformable than the material of said rigid parts 12 , 14 and, most importantly, whose elastic properties are of the same order of magnitude as those of the posterior ligaments that hold the spine together.
- Organic silicon compoundsconstitute polymers whose mechanical properties can be determined by the choice of their basic components, in particular by their degree of substitution, the nature of the substituents, and their molecular weight, and whose elastic behavior predominates over its plastic behavior. They therefore constitute a family of materials suitable for interconnecting the two rigid parts 12 and 14 . Also, these polymers can adhere strongly to materials of inorganic composition. Thus the connecting body 24 provides good means for fastening together the rigid parts 12 , 14 , which are generally made of titanium alloy.
- polymer materials that can be usedare not limited to organic silicon compounds, and any other material having comparable properties could be suitable.
- the material of the connecting body 24is adapted to adhere to the fastening walls 20 ′ and 22 ′ of said fastening second portions 20 , 22 .
- openings 30 , 32are formed in the fastening walls 20 , 22 of the fastening, second portions and are adapted to cooperate with asperities 26 , 28 on the connecting body 24 which are inserted into the openings 30 , 32 .
- This featureincreases the contact area between the two materials and thereby increases the connecting force between them in a direction normal to said surface of contact and creates static friction forces which are additional to the adhesion force.
- connection of the above kindis obtained either by injecting the polymer while hot between the two rigid parts 12 and 14 held facing each other in a mold, or by cold molding the mixture of monomers between the two rigid parts 12 and 14 , if the speed of the reaction is sufficiently low.
- the asperities 26 , 28are therefore formed in situ, when the polymer liquid or paste inserted into the openings 26 , 28 solidifies after cooling or after a chemical reaction.
- the connecting body 24consists of the polymer disposed between the rigid parts 12 and 14 , more specifically between the fastening walls 20 ′ and 22 ′, and, in order to retain the polymer between the facing portions while it is in the liquid state, the walls of the mold must necessarily surround the space between and in line with the two rigid parts 12 , 14 .
- the openings 30 , 32 formed in the fastening walls 20 ′ and 22 ′open onto the outside wall of the rigid parts 12 and 14 so that the liquid polymer penetrates entirely into the openings 30 , 32 without it being possible for air to be trapped therein. This reinforces the fastening of the connecting body 24 to the rigid parts 12 , 14 .
- the openings 30 , 32which are shown as parallel to the longitudinal axis of the connecting member in FIG. 2 , can be oblique to that longitudinal axis and/or not rectilinear. These configurations increase the static friction forces of the polymer on the rigid parts, which fastens them together more strongly.
- the connecting member 10is able to bend in all directions in a plane Pp perpendicular to the axis A of the connecting member when the two first portions are immobilized. Bending of the connecting member 10 compresses one edge of the connecting body 24 and stretches the diametrally opposite edge, whereas the rigid parts 12 and 14 retain their shape. Because the material of the connecting body 24 is elastically deformable, when the stresses causing the bending are removed, the connecting member 10 returns to its original state in which the rigid parts 12 and 14 are in axial alignment.
- the rigid parts 12 and 14can move relative to each other in opposite directions along the longitudinal axis A to compress or stretch the connecting body 24 .
- the relative movement of the two rigid parts 12 and 14can occur in directions other than the directions described above, but the connecting member is principally loaded in bending, tension and compression, as described in more detail below.
- FIG. 3shows the connecting member 10 whose two rigid parts 12 and 14 interconnect the two anchor members 42 and 44 .
- the two anchor members 42 and 44are parallel to each other in a common axial plane Pa.
- Each anchor member 42 , 44has a threaded shank 46 with a U-shaped head 48 at the top whose inside wall is threaded so that a screw-forming member 50 can be screwed into it.
- a screw-forming member 50can be screwed into it.
- the bending of the connecting member 10compresses the lower edge 52 of the connecting body 24 and stretches the diametrally opposite upper edge 54 , while the rigid parts 12 and 14 retain their shape. Because the material of the connecting body 24 is elastically deformable, when the stress is removed the connecting member reverts to its original rectilinear shape and the threaded shanks of the anchor members 46 return to their former relative position.
- the mechanism of elastic bending of the connecting member 10 and the anchor members 42 , 44 described aboveis the same if the threaded shanks 46 of the anchor members 42 and 44 move away from each other, the connecting member bending with the opposite curvature.
- anchor members 42 and 44are movable in translation relative to each other along the axis A, their relative movement stretching or compressing the connecting body 24 .
- connecting member 10in a vertebral stabilization system for fastening together at least two vertebrae V 1 and V 2 is described below with reference to FIG. 4 .
- the vertebrae V 1 , V 2each have respective median planes PV 1 , PV 2 substantially perpendicular to the axis Ar of the spine of which they form part, and respective posterior walls PPV 1 , PPV 2 defining a posterior median plane PPr of said spine.
- the stabilizing systemincludes at least two anchor members 42 and 44 respectively screwed into the posterior walls PPV 1 , PPV 2 of the vertebrae V 1 , V 2 , so that a line L that intersects the two anchor members 42 and 44 is substantially parallel to said axis Ar of the spine.
- the two first portions 16 and 18 of the connecting member 10interconnect the two anchor members 42 and 44 .
- the vertebrae V 1 and V 2which are interconnected in their posterior portions, possess relative mobility along the axis Ar of the spine.
- the vertebrae V 1 and V 2move away from each other in opposite directions E and ⁇ E, which causes the threaded shanks 46 to move away from each other, deforming the connecting member 10 , and in particular its connecting body 24 .
- the connecting bodyis compressed both longitudinally and at the upper edge 54 .
- the deformed connecting memberhas it concave side facing away from the spine.
- the connecting bodyis then subjected to longitudinal extension of its upper edge 54 and possibly to compression of its lower edge 52 .
- connecting member 10achieves greater relative mobility of the vertebrae compared to the prior art connecting rods, which cannot be compressed longitudinally.
- the connecting memberhas three rigid rod-forming parts 12 , 14 , 15 and two connecting bodies 24 1 , 24 2 interconnecting the three rigid parts 12 , 14 , 15 .
- the central rigid part 15includes a fixing, first portion and two fastening, second portions, with one fastening, second portion on each side of said fixing, first portion.
- the fastening, second portionsare connected to the two connecting bodies 24 1 , 24 2 .
- the other two rigid parts 12 , 14situated at the two ends of the connecting member, have a single fastening, second portion connected to the connecting bodies.
- the connecting membertherefore maintains the spacing between three anchor members that it interconnects, which are fixed to three substantially equidistant vertebrae, to align them.
- Each rigid part of the connecting memberis fixed to an anchor member so that there are respective elastically deformable connecting bodies between the pairs of vertebrae.
- a single connecting memberstabilizes three vertebrae, which reduces the time needed to assemble the stabilizing system as a whole and consequently the operating time. Also, because the three vertebrae are interconnected by a single connecting member, their mobility relative to each other is better controlled.
- connecting members having more than three rigid parts connected together by elastically deformable connecting bodieswould not depart from the scope of the invention.
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Abstract
Description
- This application is a continuation of and claims priority under 37 CFR 1.53(b) to U.S. patent application Ser. No. 10/333,881, filed Jan. 24, 2003, entitled “Flexible Linking Piece for Stabilising the Spine” by inventors Regis LeCouedic and Denis Pasquet, which claims priority under 35 U.S.C. 371 to International Application No. PCT/FR01/02426, filed Jul. 25, 2001, entitled “Flexible Linking Piece for Stabilising the Spine” by inventors Regis LeCouedic and Denis Pasquet, which claims benefit of priority to French Application No. 00/09706 entitled “Flexible Linking Piece for Stablising the Spine” by inventors Regis LeCouedic and Denis Pasquet, filed Jul. 25, 2000, all of which are incorporated herein by reference.
- This disclosure relates to a connecting member for maintaining the spacing between at least two anchor members which are interconnected by said connecting member.
- Systems for stabilizing the vertebral column by bracing at least two consecutive vertebrae by means of anchor members fixed into said vertebrae and connected by rigid connecting rods are well known in the art. Systems of this kind are generally coupled systems such that two consecutive vertebrae are interconnected by two substantially parallel rods fixed one on each side of the spinous processes. The anchor members are screwed into the posterior portions of the vertebrae and pass through the pedicles and a substantial portion of the vertebral bodies and therefore provide a fixed and durable connection.
- The above stabilizing systems are routinely used to consolidate several consecutive vertebrae. Thus the vertebrae are interconnected by rigid rods over a substantial length of the vertebral column. Such assemblies hold the vertebrae correctly relative to each other; however, they considerably stiffen the spine in terms of bending. It has been shown that a more flexible stabilizing system, which confers greater relative mobility on the vertebrae, is beneficial in some pathologies.
- A first object of embodiments described herein is to provide a connecting member for maintaining the spacing of existing anchor members while at the same time allowing relative mobility of said anchor members.
- To achieve the above object, a connecting member in accordance with one embodiment, adapted to maintain the spacing between at least two anchor members screwed into vertebrae, comprises at least two rigid rod-forming parts made of a first material and each having a fixing, first portion adapted to be fixed into an anchor member and a fastening, second portion, said rods being aligned with each other and said fastening portions facing each other, and a connecting body that is made entirely from a second material that is more elastically deformable than said first material and interconnects the facing fastening portions of said rigid parts so that said connecting body is able to deform elastically, whereby the vertebrae, which are held spaced from each other, are movable relative to each other.
- Thus a feature of the connecting member lies in the way the two rigid parts are fastened together by means of an elastically deformable connecting body which imparts relative mobility to the rigid parts when under stress, with the reaction force to the stress being proportional, within certain limits, to the deformation of the connecting body. As a result, the connecting member can be bent by stresses in directions that are not parallel to the axis of the connecting member; it can also be stretched or contracted by opposing forces acting parallel to the axis of the connecting member.
- Consequently, the two anchor members, when at rest, are interconnected by the connecting member with its fixing portions fastened to the anchor members, and can be moved relative to each other by forces proportional to the movement.
- Said rigid parts are preferably mechanically connected together by a single connecting body providing the whole of said mechanical connection. In this way a single member provides the connection between the rigid parts at the same time as controlling relative movement of the rigid parts. Also, in a particular embodiment, said connecting body consists entirely of a single second material to simplify assembly and to impart homogeneous mechanical properties to it.
- The connecting member of an embodiment has n rigid parts with n−1 connecting bodies disposed between them along the longitudinal axis of said member, each rigid part situated between two connecting bodies having one fixing, first portion and two fastening, second portions, there being one fastening, second portion at each end of said fixing, first portion, and said fastening, second portions being connected respectively to said two connecting bodies, and the rigid parts at the two ends of said member advantageously have respective single fastening, second portions connected to the connecting bodies, whereby said connecting member is adapted to interconnect n anchor members.
- Thus, by virtue of this feature, the connecting member maintains the spacing between all the anchor members that it interconnects, each of which can be fixed to a respective vertebra, to align them. Each rigid part is fixed to an anchor member and, between successive anchor members, there is a connecting body that interconnects the two fastening portions. Thus a single connecting member stabilizes several vertebrae, which reduces the time to assemble the stabilizing system as a whole and consequently the operating time. Also, by virtue of this feature, the connecting member stabilizes several consecutive vertebrae by connecting them together, while at the same time making them highly flexible and conferring on them a high degree of relative compressibility in the longitudinal direction.
- In a preferred embodiment, each of said fastening portions of said rigid parts that said connecting body interconnects has a fastening wall to which said connecting body is adapted to adhere. Thus no additional fixing member is needed and the adhesive properties of the second material to the fastening wall are sufficient to connect them.
- In one particular embodiment, said fastening wall has openings adapted to cooperate with asperities on said connecting body to increase the surface area of contact between said wall and said body.
- Obviously, providing openings in a wall increases the surface area of that wall, which increases the contact area between the two materials if one of the materials can be molded onto the wall of the other material. The increase in contact area increases the connecting forces between said connecting body and said fastening portions. Also, the static friction forces of the material of the connecting member on said two members are increased in a corresponding manner and these forces are added to the connecting forces.
- Said second material of which said connecting body is made is advantageously obtained by polymerization. In this way, the connecting body can easily be hot molded onto the fastening walls if the material is polymerized beforehand, or it can be formed in situ if the rate of polymerization of the monomers constituting said second material is sufficiently low to provide the time necessary for completing the assembly.
- In a preferred embodiment, said first material of which said rigid parts are made is a titanium alloy. It is therefore easy to form openings in said fastening wall to which said connecting body is able to adhere.
- In another preferred embodiment, the section of said rigid rod-forming parts is circular, which facilitates the manufacture of the member. Also, if prior art circular section connecting rods are to be replaced by connecting rods described herein without making it necessary to replace the anchor members, it is necessary for said rigid parts to have sections identical to the sections of the prior art connecting rods.
- The present disclosure also provides a vertebral stabilization system for fastening together at least two vertebrae each having a median plane substantially perpendicular to the axis of the spine of which they form a part and a posterior wall defining a posterior median plane of said spine, said system comprising at least two anchor members each adapted to be fixed into the posterior wall of a respective vertebra so that a line which intersects said two anchor members is substantially parallel to said axis of the spine, which system further comprises at least one connecting member whose two rigid parts are adapted to interconnect said two anchor members so that the axis of said connecting member is substantially parallel to said axis of the spine, whereby said vertebrae, which are interconnected via their posterior portions, present relative mobility along said axis of said spine.
- Other features and advantages of various embodiments will emerge on reading the following description of particular embodiments, which is given by way of non-limiting example and with reference to the accompanying drawings, in which:
FIG. 1 is a diagrammatic perspective view of a connecting member in accordance with an embodiment,FIG. 2 is a diagrammatic view in axial section of the connecting member in accordance with an embodiment,FIG. 3 is a perspective view showing anchor members connected by the connecting member,FIG. 4 is a side elevation view of a vertebral column showing two consecutive vertebrae into which there are screwed anchor members interconnected by a connecting member in accordance with an embodiment, andFIG. 5 is a perspective view showing a connecting member having two connecting bodies and three rigid parts.- The various portions of a connecting member are described initially with reference to
FIG. 1 . - The connecting
member 10 has two cylindricalrigid parts rigid part first portion second portion portions body 24 so that therigid parts member 10 is therefore circularly symmetrical about the axis A. - How the two
rigid parts FIG. 2 . - The connecting
body 24 is a plastics material body obtained by polymerization. The material of the body is chosen from materials which are more elastically deformable than the material of saidrigid parts - Organic silicon compounds constitute polymers whose mechanical properties can be determined by the choice of their basic components, in particular by their degree of substitution, the nature of the substituents, and their molecular weight, and whose elastic behavior predominates over its plastic behavior. They therefore constitute a family of materials suitable for interconnecting the two
rigid parts body 24 provides good means for fastening together therigid parts - Nevertheless, the polymer materials that can be used are not limited to organic silicon compounds, and any other material having comparable properties could be suitable.
- The material of the connecting
body 24 is adapted to adhere to thefastening walls 20′ and22′ of said fasteningsecond portions openings fastening walls asperities body 24 which are inserted into theopenings - This feature increases the contact area between the two materials and thereby increases the connecting force between them in a direction normal to said surface of contact and creates static friction forces which are additional to the adhesion force.
- A connection of the above kind is obtained either by injecting the polymer while hot between the two
rigid parts rigid parts asperities openings body 24 consists of the polymer disposed between therigid parts fastening walls 20′ and22′, and, in order to retain the polymer between the facing portions while it is in the liquid state, the walls of the mold must necessarily surround the space between and in line with the tworigid parts - In a particular embodiment (not shown) the
openings fastening walls 20′ and22′ open onto the outside wall of therigid parts openings body 24 to therigid parts - Also, the
openings FIG. 2 , can be oblique to that longitudinal axis and/or not rectilinear. These configurations increase the static friction forces of the polymer on the rigid parts, which fastens them together more strongly. - Now that the manner in which the two rigid parts are fastened together has been described, movement of the rigid parts relative to each other is described with reference to
FIG. 1 . - Given the circular symmetry of the
rigid parts body 24, and the nature of the material of the connectingbody 24, the connectingmember 10 is able to bend in all directions in a plane Pp perpendicular to the axis A of the connecting member when the two first portions are immobilized. Bending of the connectingmember 10 compresses one edge of the connectingbody 24 and stretches the diametrally opposite edge, whereas therigid parts body 24 is elastically deformable, when the stresses causing the bending are removed, the connectingmember 10 returns to its original state in which therigid parts - Also, the
rigid parts body 24. - The relative movement of the two
rigid parts - Deformation of the connecting member connected with relative movement of the
anchor members FIG. 3 . FIG. 3 shows the connectingmember 10 whose tworigid parts anchor members anchor members - Each
anchor member shank 46 with aU-shaped head 48 at the top whose inside wall is threaded so that a screw-formingmember 50 can be screwed into it. Thus thefirst portions rigid parts heads 48 of therespective anchor members members 50. - As a result, when the threaded
shanks 46 of the anchor members move towards each other due to the effect of opposite forces T and −T in the plane Pa and substantially parallel to the axis A theanchor members - The bending of the connecting
member 10 compresses thelower edge 52 of the connectingbody 24 and stretches the diametrally oppositeupper edge 54, while therigid parts body 24 is elastically deformable, when the stress is removed the connecting member reverts to its original rectilinear shape and the threaded shanks of theanchor members 46 return to their former relative position. - The mechanism of elastic bending of the connecting
member 10 and theanchor members shanks 46 of theanchor members - Also, the
anchor members body 24. - The use of the connecting
member 10 in a vertebral stabilization system for fastening together at least two vertebrae V1 and V2 is described below with reference toFIG. 4 . - The vertebrae V1, V2 each have respective median planes PV1, PV2 substantially perpendicular to the axis Ar of the spine of which they form part, and respective posterior walls PPV1, PPV2 defining a posterior median plane PPr of said spine.
- The stabilizing system includes at least two
anchor members anchor members first portions member 10 interconnect the twoanchor members - Thus when the spine is stretched, the vertebrae V1 and V2 move away from each other in opposite directions E and −E, which causes the threaded
shanks 46 to move away from each other, deforming the connectingmember 10, and in particular its connectingbody 24. This is because the connecting body is compressed both longitudinally and at theupper edge 54. The deformed connecting member has it concave side facing away from the spine. - When the spine is bent, the inverse effect occurs and the vertebrae V1 and V2 move towards each other, which induces deformation of the connecting member with its concave side facing toward the spine.
- The connecting body is then subjected to longitudinal extension of its
upper edge 54 and possibly to compression of itslower edge 52. - It will be understood that the connecting
member 10 achieves greater relative mobility of the vertebrae compared to the prior art connecting rods, which cannot be compressed longitudinally. - In a particular embodiment as shown in
FIG. 5 , the connecting member has three rigid rod-formingparts bodies rigid parts rigid part 15 includes a fixing, first portion and two fastening, second portions, with one fastening, second portion on each side of said fixing, first portion. The fastening, second portions are connected to the two connectingbodies rigid parts - The connecting member therefore maintains the spacing between three anchor members that it interconnects, which are fixed to three substantially equidistant vertebrae, to align them. Each rigid part of the connecting member is fixed to an anchor member so that there are respective elastically deformable connecting bodies between the pairs of vertebrae. In this way, a single connecting member stabilizes three vertebrae, which reduces the time needed to assemble the stabilizing system as a whole and consequently the operating time. Also, because the three vertebrae are interconnected by a single connecting member, their mobility relative to each other is better controlled.
- It goes without saying that providing connecting members having more than three rigid parts connected together by elastically deformable connecting bodies would not depart from the scope of the invention.
Claims (20)
1. A method of stabilizing a spinal segment of a body comprising:
securing a first anchor to a first vertebra, the first anchor including a head portion and a bone attachment portion;
securing a second anchor to a second vertebra, the second anchor including a head portion and a bone attachment portion;
implanting a connecting member into the body, wherein the connecting member comprises:
a first rigid portion formed of a first material comprising;
a first rod portion adapted to secure in a head portion of a first anchor; and
a first wall having a larger radius than the first rod portion;
a second rigid portion formed of the first material comprising:
a second rod portion adapted to secure in a head portion of a second anchor; and
a second wall having a larger radius than the second rod portion; and
a connecting body having a first end abutting the first wall and a second end abutting the second wall, wherein the connecting body comprises a second material that is more elastically deformable than the first material;
positioning the connecting body between the head portion of the first anchor and the head portion of the second anchor; and
positioning the first rigid portion within the head portion of the first anchor and the second rigid portion in the head portion of the second anchor.
2. The method ofclaim 1 , wherein the first wall and second wall each comprise at least one protrusion that abuts the connecting body.
3. The method ofclaim 2 , wherein the first rigid portion partially overlaps said connecting body.
4. The method ofclaim 1 , wherein the first rigid portion defines an opening passing from the first wall through the first rigid portion and open to an end of the first rod portion and the second rigid portion defines an opening passing from the second wall through the second rigid rod portion and open to and of the second rod portion.
5. The method ofclaim 1 , further comprising positioning the first rigid portion and second rigid portion from the top of the first anchor and second anchor respectively.
6. The method ofclaim 1 , further comprising:
securing the first rigid portion to the head portion of the first anchor by engaging a first locking member to a the head portion of the first anchor; and
securing the second rigid portion to the head portion of the second anchor by engaging a second locking member to a the head portion of the second anchor;
7. The method ofclaim 1 , wherein the head portion of each of the first and second anchors includes a slot adapted to receive the first rigid portion and second rigid portion respectively.
8. The method ofclaim 1 , wherein the connecting body has a greater cross-sectional area than the first rod portion and the second rod portion.
9. The method ofclaim 7 , wherein the first rigid portion and second rigid portion are formed of a biocompatible metal and the connecting body comprises a polymer.
10. A connecting member comprising:
a first rigid portion formed of a first material comprising;
a first portion adapted to secure in a head portion of a first anchor; and
a first wall having a larger radius than the first rod portion;
a second rigid portion formed of the first material comprising:
a second portion adapted to secure in a head portion of a second anchor; and
a second wall having a larger radius than the second rod portion; and
a connecting body having a first end abutting the first wall and a second end abutting the second wall, wherein the connecting body comprises a second material that is more elastically deformable than the first material.
11. The connecting member ofclaim 10 , wherein the first wall and second wall each comprise at least one protrusion that abuts the connecting body.
12. The connecting member ofclaim 11 , wherein the first rigid portion partially overlaps said connecting body.
13. The connecting member ofclaim 10 , wherein the first rigid portion defines an opening passing from the first wall through the first rigid portion and open to an end of the first rod portion and the second rigid portion defines an opening passing from the second wall through the second rigid rod portion and open to and of the second rod portion.
14. The connecting member ofclaim 10 , wherein the first material is a biocompatible metal and the second material is a polymer.
15. The connecting member ofclaim 10 , wherein the connecting body is substantially symmetrical about a longitudinal axis.
16. The connecting member ofclaim 10 , wherein the first rigid portion and the second rigid portion are cylindrical.
17. A spinal stabilization system comprising:
a first anchor coupled to a first vertebra, the first anchor having a head portion;
a second anchor coupled to a second vertebra, the second anchor having a head portion;
a connecting member comprising:
a first rigid portion formed of a first material comprising;
a first portion secured in a head portion of a first anchor; and
a first wall having a larger radius than the first rod portion;
a second rigid portion formed of the first material comprising:
a second portion secured in a head portion of a second anchor; and
a second wall having a larger radius than the second rod portion; and
a connecting body having a first end abutting the first wall and a second end abutting the second wall, wherein the connecting body comprises a second material that is more elastically deformable than the first material.
18. The spinal stabilization system ofclaim 17 , wherein the first wall and second wall each comprise at least one protrusion that abuts the connecting body.
19. The spinal stabilization system ofclaim 18 , wherein the first rigid portion partially overlaps said connecting body.
20. The spinal stabilization system ofclaim 17 , wherein the first rigid portion defines an opening passing from the first wall through the first rigid portion and open to an end of the first rigid portion and the second rigid portion defines an opening passing from the second wall through the second rigid portion and open to an end of the second rigid portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/606,901US20100114169A1 (en) | 2000-07-25 | 2009-10-27 | Flexible linking piece for stabilising the spine |
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0009706AFR2812186B1 (en) | 2000-07-25 | 2000-07-25 | FLEXIBLE CONNECTION PIECE FOR SPINAL STABILIZATION |
| FR00/09706 | 2000-07-25 | ||
| PCT/FR2001/002426WO2002007622A1 (en) | 2000-07-25 | 2001-07-25 | Flexible linking piece for stabilising the spine |
| US10/333,881US7641673B2 (en) | 2000-07-25 | 2001-07-25 | Flexible linking piece for stabilising the spine |
| US12/606,901US20100114169A1 (en) | 2000-07-25 | 2009-10-27 | Flexible linking piece for stabilising the spine |
Related Parent Applications (2)
| Application Number | Title | Priority Date | Filing Date |
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| US10/333,881ContinuationUS7641673B2 (en) | 2000-07-25 | 2001-07-25 | Flexible linking piece for stabilising the spine |
| PCT/FR2001/002426ContinuationWO2002007622A1 (en) | 2000-07-25 | 2001-07-25 | Flexible linking piece for stabilising the spine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US20100114169A1true US20100114169A1 (en) | 2010-05-06 |
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| US12/606,903AbandonedUS20100114173A1 (en) | 2000-07-25 | 2009-10-27 | Flexible linking piece for stabilising the spine |
| US12/606,901AbandonedUS20100114169A1 (en) | 2000-07-25 | 2009-10-27 | Flexible linking piece for stabilising the spine |
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| Application Number | Title | Priority Date | Filing Date |
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| US10/333,881Expired - Fee RelatedUS7641673B2 (en) | 2000-07-25 | 2001-07-25 | Flexible linking piece for stabilising the spine |
| US12/606,903AbandonedUS20100114173A1 (en) | 2000-07-25 | 2009-10-27 | Flexible linking piece for stabilising the spine |
Country Status (8)
| Country | Link |
|---|---|
| US (3) | US7641673B2 (en) |
| EP (1) | EP1303225B1 (en) |
| AT (1) | ATE296059T1 (en) |
| AU (1) | AU2001279908A1 (en) |
| DE (1) | DE60111053T2 (en) |
| ES (1) | ES2243531T3 (en) |
| FR (1) | FR2812186B1 (en) |
| WO (1) | WO2002007622A1 (en) |
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| US8641734B2 (en) | 2009-02-13 | 2014-02-04 | DePuy Synthes Products, LLC | Dual spring posterior dynamic stabilization device with elongation limiting elastomers |
| US9320543B2 (en) | 2009-06-25 | 2016-04-26 | DePuy Synthes Products, Inc. | Posterior dynamic stabilization device having a mobile anchor |
| US9445844B2 (en) | 2010-03-24 | 2016-09-20 | DePuy Synthes Products, Inc. | Composite material posterior dynamic stabilization spring rod |
| US11583318B2 (en) | 2018-12-21 | 2023-02-21 | Paradigm Spine, Llc | Modular spine stabilization system and associated instruments |
| US12114895B2 (en) | 2018-12-21 | 2024-10-15 | Xtant Medical Holdings, Inc. | Modular spine stabilization system and associated instruments |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1303225A1 (en) | 2003-04-23 |
| AU2001279908A1 (en) | 2002-02-05 |
| US20100114173A1 (en) | 2010-05-06 |
| FR2812186A1 (en) | 2002-02-01 |
| FR2812186B1 (en) | 2003-02-28 |
| US7641673B2 (en) | 2010-01-05 |
| US20040049189A1 (en) | 2004-03-11 |
| ATE296059T1 (en) | 2005-06-15 |
| EP1303225B1 (en) | 2005-05-25 |
| DE60111053D1 (en) | 2005-06-30 |
| WO2002007622A1 (en) | 2002-01-31 |
| ES2243531T3 (en) | 2005-12-01 |
| DE60111053T2 (en) | 2006-08-24 |
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| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment | Owner name:ZIMMER SPINE S.A.S.,FRANCE Free format text:CHANGE OF NAME;ASSIGNOR:ABBOTT SPINE;REEL/FRAME:024072/0871 Effective date:20090612 | |
| STCB | Information on status: application discontinuation | Free format text:ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |