US20050125029A1 - Anatomical interbody implant and gripper for same - Google Patents
Anatomical interbody implant and gripper for same Download PDFInfo
- Publication number
- US20050125029A1 US20050125029A1 US11/042,385 US4238505A US2005125029A1 US 20050125029 A1 US20050125029 A1 US 20050125029A1 US 4238505 A US4238505 A US 4238505A US 2005125029 A1 US2005125029 A1 US 2005125029A1
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- United States
- Prior art keywords
- cage
- sagittal
- forceps
- implant
- walls
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
- A61F2/4611—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof of spinal prostheses
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2/4455—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages
- A61F2/447—Joints for the spine, e.g. vertebrae, spinal discs for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
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- A61F2/02—Prostheses implantable into the body
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- A61F2002/30317—The prosthesis having different structural features at different locations within the same prosthesis
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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Definitions
- the present invention relates to an intersomatic implant for insertion into the disk space defined between two adjacent vertebrae, in order to restore an appropriate height between the vertebrae and in order to allow bone fusion to take place between said adjacent vertebrae.
- the invention provides an intersomatic implant of the cervical type, for insertion into the disk space defined between two adjacent cervical vertebrae.
- a known cervical intersomatic implant is in the form of a cage comprising two sagittal walls interconnected by a anterior transverse wall and by a posterior transverse wall. Between them, the walls define an open volume for receiving a bone-filler substance for encouraging bone fusion between the two vertebrae.
- the invention thus seeks to remedy the above-specified drawbacks by proposing an intersomatic implant adapted to comply better with the anatomy of the spinal column.
- the intersomatic implant is designed to be inserted into the disk space defined between two adjacent vertebrae, namely an overlying vertebra and an underlying vertebra, for the purpose of reestablishing the anatomic space between the vertebrae, the implant being in the form of a cage that is generally in the shape of a rectangular block having at least two sagittal walls substantially parallel to a sagittal plane and interconnected at least by an anterior transverse wall and by a posterior transverse wall extending substantially parallel to a frontal plane, the walls defining between them an open volume for bone filler and presenting rims extending on one surface to define a first transverse face and on the opposite surface to define a second transverse face.
- the implant comprises:
- the invention also seeks to provide an instrument for manipulating such a cage, enabling the drawbacks of known manipulation instruments to be remedied. It is known to provide two holes in the anterior wall of a cage so as to enable two fingers presented by a manipulation instrument to be engaged therein. Unfortunately, while the instrument is manipulating the cage, there is a risk of the cage becoming separated from the instrument, and of it becoming impossible to withdraw the implant after it has been put into place.
- Another object of the invention is thus to provide an instrument for manipulating a cage in the general sense, regardless of whether it is cervical and/or lumbar, and adapted to hold the implant safely and reliably while it is being put into place or repositioned.
- the manipulation instrument of the invention is a forceps for an implant in the form of a cage generally in the shape of a rectangular block comprising at least two sagittal walls substantially parallel to a sagittal plane and interconnected at least by an anterior transverse wall and by a posterior transverse wall substantially parallel to a frontal plane, the cage being provided with two housings extending substantially facing each other in a frontal direction substantially perpendicularly to the sagittal plane of the cage, the forceps having two branches movable relative to each other and each provided with an insert-engaging jaw.
- each jaw is provided with a radial stud extending in line with the other radial stud and suitable for being moved towards the other stud so as to be engaged in a respective housing formed in the implant.
- FIG. 1 is a perspective view of an embodiment of an implant in accordance with the invention.
- FIG. 2 is a front view of an implant seen substantially along arrows f 2 of FIG. 1 .
- FIG. 3 is a sagittal view of an implant seen substantially along arrow f 3 of FIG. 1 .
- FIG. 4 is a plan view of a forceps for manipulating an implant in accordance with the invention.
- FIGS. 5 and 6 are views on a larger scale respectively from above and from the side showing the implant-engaging jaws of the forceps shown in FIG. 4 .
- FIG. 7 is a perspective view showing an intersomatic implant supported by a manipulation forceps in accordance with the invention.
- an intersomatic implant in accordance with the invention is in the form of a cage 1 which is generally in the form of a rectangular block and is designed to be inserted in the disk space between two adjacent vertebrae, e.g. cervical vertebrae.
- the cage 1 has a first sagittal wall 2 and a second sagittal wall 3 extending substantially parallel to each other and to a “sagittal” or “antero-posterior” plane S.
- the sagittal walls 2 and 3 are interconnected by an “anterior” transverse wall 4 and by a “posterior” transverse wall 5 extending parallel to each other and to a frontal plane F extending perpendicularly to the sagittal plane S.
- the cage 1 can have one or more intermediate or mid walls extending substantially parallel to the sagittal and/or transverse walls.
- connecting fillets 6 are provided between the sagittal walls and the transverse walls firstly along their internal vertical faces and secondly along their external vertical faces so as to provide a cage 1 having rounded corners on its external and internal vertical faces.
- the walls 2 to 5 present substantially the same thickness.
- the height of the anterior transverse wall 4 is greater than the height of the posterior transverse wall 5 ( FIG. 3 ).
- the cage 1 presents a volume 7 defined by the vertical inside faces of the walls 2 to 5 and designed to be filled with a bone-filler substance for prompting intersomatic fusion.
- this volume 7 opens out into a first transverse face 8 that is on top and into a second transverse face 9 that is at the bottom.
- the walls 2 to 5 present, on one surface, rims 10 defining the top transverse face 8 , and on the opposite surface, rims 10 ′ defining the bottom transverse face 9 .
- the cage 1 has protuberances or projections 11 formed on the rims 10 and 10 ′ of the walls 2 to 5 so as to enable the cage to bite into the underlying and overlying vertebrae.
- the protuberances 11 are constituted by ridges extending parallel to one another and to the frontal plane F.
- the protuberances can be of different shapes and could be implemented, for example, in the form of individual spikes or by ridges forming chevrons.
- the top and bottom transverse faces 8 and 9 correspond to the envelope containing the tips of the protuberances 11 .
- the top transverse face 8 has a convex profile C 8 in the sagittal plane S which is congruent with or complementary to the sagittal anatomic profile of an adjacent or overlying vertebra in the example shown. It should be understood that the rims 10 of the walls and more precisely the protuberances 11 defining said top transverse face 8 are arranged to be inscribed in an envelope whose section in the sagittal plane S is rounded or convex in shape.
- the top transverse face 8 is defined in the frontal plane F by a straight or rectilinear profile C′ 8 ( FIG. 2 ).
- the rims 10 of the walls 2 to 5 defining the top transverse face 8 are preferably arranged to be connected to the outside faces of the walls 2 to 5 via connecting fillets 12 .
- the bottom transverse face 9 presents a convex profile C 9 in the frontal plane F, which profile is congruent with or complementary to the frontal anatomic profile of an adjacent or underlying vertebra in the example shown.
- the rims 10 ′ of the walls 2 to 5 , and more precisely the protuberances 11 defining said transverse face 9 are arranged to be inscribed in an envelope whose section in the plane S is of rounded shape.
- bottom transverse face 9 presents a profile C′ 9 in the sagittal plane that is substantially straight.
- the above-described cage 1 is adapted to receive at least one, and in the example shown two, radio-opaque markers 13 incorporated over at least a portion of the height of the cage in the anterior and posterior transverse walls 4 and 5 .
- the above-described cage 1 is particularly adapted to enable it to be manipulated by manipulation forceps 15 of the kind shown in FIGS. 4 to 7 , the forceps having two branches 16 each provided at one end with an insert-engaging jaw 17 .
- the cage 1 has two housings 20 extending in line with each other and each adapted to receive a radial stud 21 formed on each of the jaws 17 of the forceps.
- the housings 20 are formed in the sagittal walls 2 and 3 , being in alignment and extending in a frontal direction perpendicular to the sagittal plane S.
- the housings 20 are preferably located close to the anterior transverse wall 4 .
- each housing 20 opens out into the two opposite vertical faces of the walls 2 and 3 .
- the housings 20 could be provided in the anterior transverse wall 4 extending in a frontal direction perpendicular to the sagittal plane S.
- each housing 20 can be directly in communication with each other so as to constitute a single bore.
- the transverse right section of each housing 20 is adapted to receive a radial stud 21 , and, for example, is substantially elliptical in the example shown.
- the cage 1 includes antirotation means 23 for co-operating with complementary means 24 provided on the jaws 17 of the manipulation forceps so as to prevent relative rotation between the cage 1 and the forceps 15 when the forceps are engaging the insert.
- these antirotation means 23 are constituted by a groove formed in each sagittal wall 2 , 3 to open out into a corresponding housing 20 and extending therefrom to the outside face of the anterior transverse walls 4 .
- each groove 23 is substantially rectangular in right cross-section.
- each insert-engaging jaw 17 is arranged to present complementary antirotation means 24 in the form of an arm or a bar having a free end carrying a radial stud 21 lying substantially in alignment with the other radial stud.
- Each arm 24 is of cross-section complementary to that of the groove 23 and is designed to be engaged at least in part in the groove 23 formed in a sagittal wall when each of the studs 21 is engaged in a complementary housing 20 .
- the outside faces of the jaws 17 i.e. the arms 24 , extend substantially in line with the outside faces of the sagittal walls 2 and 3 so as to limit the approach path required for installing the cage.
- Engaging the studs 21 in the housings 20 ensures that the cage is held securely and prevented from moving in translation, and the co-operation between the arms 24 and the grooves 23 prevents the cage from moving in rotation, in particular in a frontal direction. This ensures that the cage is completely prevented from moving relative to the jaws 17 .
- the antirotation means 23 , 24 could be implemented in a different manner.
- the housings 20 could be prismatic in shape for co-operating with studs of complementary shape.
- each jaw 17 is provided with a stop abutment 27 for coming into contact with the external face of the anterior transverse wall 4 of the cage when the studs 21 are engaged in the housings 20 so as to transmit forces that are exerted axially on the forceps.
- each stop abutment 27 extends radially substantially parallel to the adjacent stud 21 which is connected to the stop abutment 27 via the locking arm 24 .
- Each stop abutment 27 is preferably arranged on the jaw 17 so as to come into contact with the external face of the anterior wall of the cage substantially in line with the sagittal walls 2 and 3 .
- Such a disposition provides the advantage of enabling pressure forces exerted on the end 30 of the forceps where the branches 16 join to be transmitted in such a manner as to facilitate insertion of the cage between the vertebrae.
- the branches 16 of the forceps are preferably made so as to be resilient and urge the jaws 17 permanently towards each other. In this respect, moving the branches 16 towards each other causes the jaws 17 to move apart because the branches cross over, whereas releasing the branches 16 automatically causes the jaws 17 to move towards each other.
- the above-described cage 1 is particularly adapted to complying with the disk space defined between two vertebrae, e.g. cervical vertebrae. Complying with the anatomy of the intervertebral disk that is replaced by the cage 1 serves to encourage bone fusion between the vertebrae and to restore the static configuration of the spine. Furthermore, the cage 1 is made particularly simple to put into place by using the manipulation forceps 15 of the invention. Thus, from an anterior approach path to the cervical spine, resection is performed on the osteophytes, the disk is removed, and then the plane faces of the vertebrae are revivified.
- a cage 1 can be taken hold of by the forceps 15 by acting on the branches 16 to move the jaws 17 apart, then positioning the studs 21 in the housings 20 , and then by acting on the branches so that the jaws 17 move towards each other, causing the studs 21 to penetrate into the housings 20 and causing the arms 24 to penetrate into the grooves 23 .
- the grooves 23 are capable of providing a guidance function for the studs 21 which are thus brought up to the housings for insertion purposes.
- the cage 1 is held completely securely relative to the forceps by the studs 21 being engaged in the housings 20 and by the arms 24 being engaged in the grooves 23 , and also by the abutments 27 coming into contact against the anterior transverse wall 4 .
- the cage 1 can be inserted into the disk space, with it being possible to apply thrust force to the end 30 of the forceps, should that be necessary. Pressing the branches 16 together to move the jaws 17 apart enables the studs 21 to be disengaged from the housings 20 so as to allow the forceps to be withdrawn.
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Abstract
The invention relates to an intersomatic implant designed to be inserted in the disk space defined between two adjacent vertebrae, namely an overlying vertebra and an underlying vertebra, for the purpose of reestablishing the anatomic space between the vertebrae, the implant being in the form of a cage (1) that is generally in the shape of a rectangular block having at least two sagittal walls (2, 3) interconnected at least by an anterior transverse wall (4) and by a posterior transverse wall (5), the walls (2 to 5) presenting rims (10) extending on one surface to define a first transverse face (8) and on the other side to define a second transverse face (9). According to the invention, the implant comprises:
-
- a first transverse face (8) presenting in the sagittal plane a convex profile congruent with the sagittal anatomic profile of an overlying vertebra; and a second transverse face presenting in the frontal plane a convex profile congruent with the frontal anatomic profile of an overlying vertebra.
Description
- The present invention relates to an intersomatic implant for insertion into the disk space defined between two adjacent vertebrae, in order to restore an appropriate height between the vertebrae and in order to allow bone fusion to take place between said adjacent vertebrae.
- More precisely, the invention provides an intersomatic implant of the cervical type, for insertion into the disk space defined between two adjacent cervical vertebrae.
- In the state of the art, it is known to insert an intersomatic implant into the disk space between defined between two adjacent cervical vertebrae. Numerous embodiments of such intersomatic implants are proposed in the prior art. For example, a known cervical intersomatic implant is in the form of a cage comprising two sagittal walls interconnected by a anterior transverse wall and by a posterior transverse wall. Between them, the walls define an open volume for receiving a bone-filler substance for encouraging bone fusion between the two vertebrae.
- In general, it can be assumed that inserting an implant of the above-described type into the disk space between two adjacent vertebrae is liable to lead to the vertebrae being incorrectly positioned relative to each other. This means that it is not possible to obtain good bone reconstitution between the vertebrae concerned.
- The invention thus seeks to remedy the above-specified drawbacks by proposing an intersomatic implant adapted to comply better with the anatomy of the spinal column.
- To achieve such an object, the intersomatic implant is designed to be inserted into the disk space defined between two adjacent vertebrae, namely an overlying vertebra and an underlying vertebra, for the purpose of reestablishing the anatomic space between the vertebrae, the implant being in the form of a cage that is generally in the shape of a rectangular block having at least two sagittal walls substantially parallel to a sagittal plane and interconnected at least by an anterior transverse wall and by a posterior transverse wall extending substantially parallel to a frontal plane, the walls defining between them an open volume for bone filler and presenting rims extending on one surface to define a first transverse face and on the opposite surface to define a second transverse face.
- According to the invention, the implant comprises:
-
- a first transverse face presenting in the sagittal plane a convex profile congruent with the sagittal anatomic profile of an overlying vertebra; and
- a second transverse face presenting in the frontal plane a convex profile congruent with the frontal anatomic profile of an overlying vertebra.
- The invention also seeks to provide an instrument for manipulating such a cage, enabling the drawbacks of known manipulation instruments to be remedied. It is known to provide two holes in the anterior wall of a cage so as to enable two fingers presented by a manipulation instrument to be engaged therein. Unfortunately, while the instrument is manipulating the cage, there is a risk of the cage becoming separated from the instrument, and of it becoming impossible to withdraw the implant after it has been put into place.
- Another object of the invention is thus to provide an instrument for manipulating a cage in the general sense, regardless of whether it is cervical and/or lumbar, and adapted to hold the implant safely and reliably while it is being put into place or repositioned.
- To achieve such an object, the manipulation instrument of the invention is a forceps for an implant in the form of a cage generally in the shape of a rectangular block comprising at least two sagittal walls substantially parallel to a sagittal plane and interconnected at least by an anterior transverse wall and by a posterior transverse wall substantially parallel to a frontal plane, the cage being provided with two housings extending substantially facing each other in a frontal direction substantially perpendicularly to the sagittal plane of the cage, the forceps having two branches movable relative to each other and each provided with an insert-engaging jaw.
- According to the invention, each jaw is provided with a radial stud extending in line with the other radial stud and suitable for being moved towards the other stud so as to be engaged in a respective housing formed in the implant.
- Various other characteristics appear from the following description given with reference to the accompanying drawings which show embodiments and implementations of the invention as non-limiting examples.
-
FIG. 1 is a perspective view of an embodiment of an implant in accordance with the invention. -
FIG. 2 is a front view of an implant seen substantially along arrows f2 ofFIG. 1 . -
FIG. 3 is a sagittal view of an implant seen substantially along arrow f3 ofFIG. 1 . -
FIG. 4 is a plan view of a forceps for manipulating an implant in accordance with the invention. -
FIGS. 5 and 6 are views on a larger scale respectively from above and from the side showing the implant-engaging jaws of the forceps shown inFIG. 4 . -
FIG. 7 is a perspective view showing an intersomatic implant supported by a manipulation forceps in accordance with the invention. - As can be seen more precisely in FIGS. 1 to 3, an intersomatic implant in accordance with the invention is in the form of a cage 1 which is generally in the form of a rectangular block and is designed to be inserted in the disk space between two adjacent vertebrae, e.g. cervical vertebrae. The cage 1 has a first sagittal wall 2 and a second
sagittal wall 3 extending substantially parallel to each other and to a “sagittal” or “antero-posterior” plane S. Thesagittal walls 2 and 3 are interconnected by an “anterior”transverse wall 4 and by a “posterior”transverse wall 5 extending parallel to each other and to a frontal plane F extending perpendicularly to the sagittal plane S. - It should be observed that the cage 1 can have one or more intermediate or mid walls extending substantially parallel to the sagittal and/or transverse walls. Preferably, connecting
fillets 6 are provided between the sagittal walls and the transverse walls firstly along their internal vertical faces and secondly along their external vertical faces so as to provide a cage 1 having rounded corners on its external and internal vertical faces. For example, the walls 2 to 5 present substantially the same thickness. Similarly, the height of the anteriortransverse wall 4 is greater than the height of the posterior transverse wall 5 (FIG. 3 ). - Internally, the cage 1 presents a
volume 7 defined by the vertical inside faces of the walls 2 to 5 and designed to be filled with a bone-filler substance for prompting intersomatic fusion. In the example shown, thisvolume 7 opens out into a firsttransverse face 8 that is on top and into a secondtransverse face 9 that is at the bottom. The walls 2 to 5 present, on one surface,rims 10 defining the toptransverse face 8, and on the opposite surface, rims 10′ defining the bottomtransverse face 9. - The cage 1 has protuberances or
projections 11 formed on therims protuberances 11 are constituted by ridges extending parallel to one another and to the frontal plane F. Naturally, the protuberances can be of different shapes and could be implemented, for example, in the form of individual spikes or by ridges forming chevrons. In general, it should be understood that the top and bottomtransverse faces protuberances 11. - According to a characteristic of the invention which is shown more clearly in
FIG. 3 , the toptransverse face 8 has a convex profile C8 in the sagittal plane S which is congruent with or complementary to the sagittal anatomic profile of an adjacent or overlying vertebra in the example shown. It should be understood that therims 10 of the walls and more precisely theprotuberances 11 defining said toptransverse face 8 are arranged to be inscribed in an envelope whose section in the sagittal plane S is rounded or convex in shape. - In a preferred embodiment, the top
transverse face 8 is defined in the frontal plane F by a straight or rectilinear profile C′8 (FIG. 2 ). Therims 10 of the walls 2 to 5 defining the toptransverse face 8 are preferably arranged to be connected to the outside faces of the walls 2 to 5 via connectingfillets 12. - According to another characteristic of the invention which can be seen more clearly in
FIG. 2 , the bottomtransverse face 9 presents a convex profile C9 in the frontal plane F, which profile is congruent with or complementary to the frontal anatomic profile of an adjacent or underlying vertebra in the example shown. Therims 10′ of the walls 2 to 5, and more precisely theprotuberances 11 defining saidtransverse face 9 are arranged to be inscribed in an envelope whose section in the plane S is of rounded shape. - Furthermore, it should be observed that the bottom
transverse face 9 presents a profile C′9 in the sagittal plane that is substantially straight. - Advantageously, the above-described cage 1 is adapted to receive at least one, and in the example shown two, radio-
opaque markers 13 incorporated over at least a portion of the height of the cage in the anterior and posteriortransverse walls - The above-described cage 1 is particularly adapted to enable it to be manipulated by
manipulation forceps 15 of the kind shown in FIGS. 4 to 7, the forceps having twobranches 16 each provided at one end with an insert-engaging jaw 17. - The cage 1 has two
housings 20 extending in line with each other and each adapted to receive aradial stud 21 formed on each of thejaws 17 of the forceps. In the example shown, thehousings 20 are formed in thesagittal walls 2 and 3, being in alignment and extending in a frontal direction perpendicular to the sagittal plane S. Thehousings 20 are preferably located close to the anteriortransverse wall 4. In the example shown, eachhousing 20 opens out into the two opposite vertical faces of thewalls 2 and 3. Naturally, thehousings 20 could be provided in the anteriortransverse wall 4 extending in a frontal direction perpendicular to the sagittal plane S. In this embodiment, it can be observed that the twohousings 20 can be directly in communication with each other so as to constitute a single bore. The transverse right section of eachhousing 20 is adapted to receive aradial stud 21, and, for example, is substantially elliptical in the example shown. - In a preferred embodiment, the cage 1 includes antirotation means 23 for co-operating with
complementary means 24 provided on thejaws 17 of the manipulation forceps so as to prevent relative rotation between the cage 1 and theforceps 15 when the forceps are engaging the insert. In the example shown, these antirotation means 23 are constituted by a groove formed in eachsagittal wall 2, 3 to open out into acorresponding housing 20 and extending therefrom to the outside face of the anteriortransverse walls 4. As shown more particularly inFIG. 3 , eachgroove 23 is substantially rectangular in right cross-section. - As can be seen more clearly in FIGS. 4 to 6, each insert-
engaging jaw 17 is arranged to present complementary antirotation means 24 in the form of an arm or a bar having a free end carrying aradial stud 21 lying substantially in alignment with the other radial stud. Eacharm 24 is of cross-section complementary to that of thegroove 23 and is designed to be engaged at least in part in thegroove 23 formed in a sagittal wall when each of thestuds 21 is engaged in acomplementary housing 20. According to a preferred characteristic of the invention, when thestuds 21 are engaged in the housings 20 (FIG. 7 ), the outside faces of thejaws 17, i.e. thearms 24, extend substantially in line with the outside faces of thesagittal walls 2 and 3 so as to limit the approach path required for installing the cage. - Engaging the
studs 21 in thehousings 20 ensures that the cage is held securely and prevented from moving in translation, and the co-operation between thearms 24 and thegrooves 23 prevents the cage from moving in rotation, in particular in a frontal direction. This ensures that the cage is completely prevented from moving relative to thejaws 17. It should be observed that the antirotation means 23, 24 could be implemented in a different manner. For example, thehousings 20 could be prismatic in shape for co-operating with studs of complementary shape. - According to a preferred characteristic, each
jaw 17 is provided with astop abutment 27 for coming into contact with the external face of the anteriortransverse wall 4 of the cage when thestuds 21 are engaged in thehousings 20 so as to transmit forces that are exerted axially on the forceps. As can be seen more precisely inFIG. 4 to 6, eachstop abutment 27 extends radially substantially parallel to theadjacent stud 21 which is connected to thestop abutment 27 via the lockingarm 24. Eachstop abutment 27 is preferably arranged on thejaw 17 so as to come into contact with the external face of the anterior wall of the cage substantially in line with thesagittal walls 2 and 3. Such a disposition provides the advantage of enabling pressure forces exerted on theend 30 of the forceps where thebranches 16 join to be transmitted in such a manner as to facilitate insertion of the cage between the vertebrae. Thebranches 16 of the forceps are preferably made so as to be resilient and urge thejaws 17 permanently towards each other. In this respect, moving thebranches 16 towards each other causes thejaws 17 to move apart because the branches cross over, whereas releasing thebranches 16 automatically causes thejaws 17 to move towards each other. - The above-described cage 1 is particularly adapted to complying with the disk space defined between two vertebrae, e.g. cervical vertebrae. Complying with the anatomy of the intervertebral disk that is replaced by the cage 1 serves to encourage bone fusion between the vertebrae and to restore the static configuration of the spine. Furthermore, the cage 1 is made particularly simple to put into place by using the
manipulation forceps 15 of the invention. Thus, from an anterior approach path to the cervical spine, resection is performed on the osteophytes, the disk is removed, and then the plane faces of the vertebrae are revivified. Thereafter, a cage 1 can be taken hold of by theforceps 15 by acting on thebranches 16 to move thejaws 17 apart, then positioning thestuds 21 in thehousings 20, and then by acting on the branches so that thejaws 17 move towards each other, causing thestuds 21 to penetrate into thehousings 20 and causing thearms 24 to penetrate into thegrooves 23. It should be observed that thegrooves 23 are capable of providing a guidance function for thestuds 21 which are thus brought up to the housings for insertion purposes. In this position, the cage 1 is held completely securely relative to the forceps by thestuds 21 being engaged in thehousings 20 and by thearms 24 being engaged in thegrooves 23, and also by theabutments 27 coming into contact against the anteriortransverse wall 4. The cage 1 can be inserted into the disk space, with it being possible to apply thrust force to theend 30 of the forceps, should that be necessary. Pressing thebranches 16 together to move thejaws 17 apart enables thestuds 21 to be disengaged from thehousings 20 so as to allow the forceps to be withdrawn. - The invention is not limited to the examples described and shown since numerous modifications can be made thereto without going beyond the ambit of the invention.
Claims (6)
1. Manipulation forceps for an implant, the implant being in the form of a cage that is generally in the shape of a rectangular block-having at least two sagittal walls substantially parallel to a sagittal plane and interconnected at least by an anterior transverse wall and by a posterior transverse wall substantially parallel to a frontal plane, the cage being provided with two housings extending substantially facing each other in a frontal direction substantially perpendicularly to the sagittal plane of the cage, the forceps comprising two branches movable relative to each other and each provided with an insert-engaging jaw,
each jaw being provided with a radial stud extending in line with the other radial stud and suitable for being moved towards the other stud so as to be engaged in a respective housing formed in the implant.
2. Manipulation forceps according to claim 1 , wherein the jaws are arranged to present antirotation means complementary to means provided on the cage so as to enable the cage to be prevented from moving relative to the forceps.
3. Manipulation forceps according to claim 2 , wherein each jaw includes, as its complementary antirotation means, an arm which is provided at its end with a radial stud and which is designed to be engaged, at least in part, in a groove formed in a sagittal wall and extending from the housing to the external face of the anterior wall.
4. Manipulation forceps according to claim 1 , wherein each jaw is provided with a stop abutment for coming into contact against the external face of the anterior transverse wall of the cage when the studs are engaged in the housings so as to transmit forces exerted on the forceps.
5. Manipulation forceps according to claim 4 , wherein each stop abutment is arranged on a jaw so as to come into contact with the external face of the anterior transverse wall of the cage substantially in line with the sagittal walls.
6. Manipulation forceps according to claim 1 , wherein the jaws are urged towards each other by the branches.
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FR9909122A FR2795945B1 (en) | 1999-07-09 | 1999-07-09 | ANATOMICAL INTERSOMATIC IMPLANT AND GRIPPER FOR SUCH AN IMPLANT |
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US11/042,385 Abandoned US20050125029A1 (en) | 1999-07-09 | 2005-01-25 | Anatomical interbody implant and gripper for same |
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US10/030,398 Expired - Lifetime US6964687B1 (en) | 1999-07-09 | 2000-07-07 | Anatomical interbody implant and gripper for same |
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AT (1) | ATE406147T1 (en) |
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FR (1) | FR2795945B1 (en) |
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US20090062917A1 (en) * | 2007-08-27 | 2009-03-05 | Foley Kevin T | Spinal interbody replacement devices |
US20090117512A1 (en) * | 2007-11-02 | 2009-05-07 | Mark Minium | Orthodontic Instrument For Use With Adjustable Orthodontic Apparatus |
US20090228113A1 (en) * | 2008-03-05 | 2009-09-10 | Comformis, Inc. | Edge-Matched Articular Implant |
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Also Published As
Publication number | Publication date |
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EP1194087B1 (en) | 2008-08-27 |
ES2312357T3 (en) | 2009-03-01 |
DE60040071D1 (en) | 2008-10-09 |
AU6295700A (en) | 2001-01-30 |
WO2001003615A1 (en) | 2001-01-18 |
EP1194087A1 (en) | 2002-04-10 |
US6964687B1 (en) | 2005-11-15 |
ATE406147T1 (en) | 2008-09-15 |
PT1194087E (en) | 2008-12-10 |
FR2795945A1 (en) | 2001-01-12 |
FR2795945B1 (en) | 2001-10-26 |
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