CA2481375A1 - Intervertebal prosthesis or nucleus replacement prosthesis - Google Patents
Intervertebal prosthesis or nucleus replacement prosthesis Download PDFInfo
- Publication number
- CA2481375A1 CA2481375A1 CA002481375A CA2481375A CA2481375A1 CA 2481375 A1 CA2481375 A1 CA 2481375A1 CA 002481375 A CA002481375 A CA 002481375A CA 2481375 A CA2481375 A CA 2481375A CA 2481375 A1 CA2481375 A1 CA 2481375A1
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- Canada
- Prior art keywords
- intervertebral disk
- per
- disk prosthesis
- spiral
- prosthesis
- 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
Links
- 239000000017 hydrogel Substances 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 5
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 4
- 238000007373 indentation Methods 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 238000001746 injection moulding Methods 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 230000007423 decrease Effects 0.000 abstract 1
- 239000007943 implant Substances 0.000 description 7
- 238000004804 winding Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920001692 polycarbonate urethane Polymers 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 210000002517 zygapophyseal joint Anatomy 0.000 description 1
Classifications
-
- 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
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
-
- 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
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2/442—Intervertebral or spinal discs, e.g. resilient
-
- 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
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30108—Shapes
- A61F2002/30199—Three-dimensional shapes
- A61F2002/30291—Three-dimensional shapes spirally-coiled, i.e. having a 2D spiral cross-section
-
- 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
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2002/4415—Joints for the spine, e.g. vertebrae, spinal discs elements of the prosthesis being arranged in a chain like manner
-
- 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
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0063—Three-dimensional shapes
- A61F2230/0091—Three-dimensional shapes helically-coiled or spirally-coiled, i.e. having a 2-D spiral cross-section
Abstract
Disclosed is an intervertebral prosthesis or nucleus replacement prosthesis (1) comprising a longitudinal, elastic, coilable body (2), a first, outer end (3), a second, inner end (4), and a longitudinal central axis (5). The cross section (10) of the body (2), which is perpendicular relative to the central axis (5), decreases towards the second, inner end (4).
Description
26.3.2002 English translation of the specification of the International Patent Application No. PCT/CH02/00189 "lntervertebral Prosthesis or Nuclear Prosthesis" in the name of Maths Medizinaltechnik AG
Intervertebral Prosthesis or Nuclear Prosthesis The invention relates to an intervertebal prosthesis or nuclear prosthesis as per to the generic term of patent claim 1.
Such prostheses are inserted into the intervertebral disk space between two adjacent vertebral bodies, after removal of the damaged natural disk or the damaged nucleus of a disk. The intended objective is to recreate conditions resembling the natural conditions as closely as possible, which means in particular restoring the height of the original disk and thereby restoring the original spacing between two adjacent vertebral bodies.
From the state of the art intervertebral disk prostheses are already known, for example from FR-A-2 712 486 BRESLAVE, whereby a bendable but not flexibility-yielding VELKRO tape is spiral-wound to form a circular disk. To enable winding the tape in a spiral shape, this known prosthesis requires a cylindrical centre piece to which the tape is attached and then wound around it by rotating the centre piece.
A disadvantage of this known intervertebrai disk prosthesis is the transition between the relatively large centre piece and the relatively narrow tape as well as the lacking elasticity-yield of the tape. The size of the centre piece at the same time also determines the size of the entry opening, whereby the latter should be kept as small as possible which, however, is impossible with this known prosthesis.
From EP-A-0 773 008 an intervertebral prosthesis according to the generic term under claim 1 is known. A disadvantage of this known prosthesis is again the relatively large cylindrical centre piece to which the elongated, spiral-shaped object is attached with a linking component of a lesser width which acts as a joint. Handling of the cylindrical centre piece with the successive articulate linking component is difficult and requires effort - precisely because it is shaped to be springy and articulate. Furthermore, the cylindrical centre piece is obtrusive.
The above discussion of the state of the art was merely entered into to describe the context of the invention and does not mean that at the time of this application or its priority, the state of the art had actually been publicised or was public knowledge.
The invention intends to resolve these issues. The invention is based on the challenge of producing an intervertebral disk prosthesis or nucleus prosthesis which due to its geometric shape restores the height of the intervertebral disk, absorbs any occurring acting forces across the entire - preferably convex-shaped - surface and reduces the pressure in the facet joints, diverts forces to the anulus while not aversely affecting the natural movement but supporting it.
The reduced size of the interior end of the intervertebral disk prosthesis or nuclear prosthesis enables easier handling of the instruments. As a result the resistance when drawing the implant into the inserting instrument lessens.
The endplate centre is very thin and can therefore be pushed in relatively easily; on account of the thinner cross section in the centre of the implant, it is designed as a relatively flexible zone, so that the occurring pressures are better absorbed.
The invention solves the task at hand with an intervertebral disk prosthesis featuring the characteristics of claim 1.
Intervertebral Prosthesis or Nuclear Prosthesis The invention relates to an intervertebal prosthesis or nuclear prosthesis as per to the generic term of patent claim 1.
Such prostheses are inserted into the intervertebral disk space between two adjacent vertebral bodies, after removal of the damaged natural disk or the damaged nucleus of a disk. The intended objective is to recreate conditions resembling the natural conditions as closely as possible, which means in particular restoring the height of the original disk and thereby restoring the original spacing between two adjacent vertebral bodies.
From the state of the art intervertebral disk prostheses are already known, for example from FR-A-2 712 486 BRESLAVE, whereby a bendable but not flexibility-yielding VELKRO tape is spiral-wound to form a circular disk. To enable winding the tape in a spiral shape, this known prosthesis requires a cylindrical centre piece to which the tape is attached and then wound around it by rotating the centre piece.
A disadvantage of this known intervertebrai disk prosthesis is the transition between the relatively large centre piece and the relatively narrow tape as well as the lacking elasticity-yield of the tape. The size of the centre piece at the same time also determines the size of the entry opening, whereby the latter should be kept as small as possible which, however, is impossible with this known prosthesis.
From EP-A-0 773 008 an intervertebral prosthesis according to the generic term under claim 1 is known. A disadvantage of this known prosthesis is again the relatively large cylindrical centre piece to which the elongated, spiral-shaped object is attached with a linking component of a lesser width which acts as a joint. Handling of the cylindrical centre piece with the successive articulate linking component is difficult and requires effort - precisely because it is shaped to be springy and articulate. Furthermore, the cylindrical centre piece is obtrusive.
The above discussion of the state of the art was merely entered into to describe the context of the invention and does not mean that at the time of this application or its priority, the state of the art had actually been publicised or was public knowledge.
The invention intends to resolve these issues. The invention is based on the challenge of producing an intervertebral disk prosthesis or nucleus prosthesis which due to its geometric shape restores the height of the intervertebral disk, absorbs any occurring acting forces across the entire - preferably convex-shaped - surface and reduces the pressure in the facet joints, diverts forces to the anulus while not aversely affecting the natural movement but supporting it.
The reduced size of the interior end of the intervertebral disk prosthesis or nuclear prosthesis enables easier handling of the instruments. As a result the resistance when drawing the implant into the inserting instrument lessens.
The endplate centre is very thin and can therefore be pushed in relatively easily; on account of the thinner cross section in the centre of the implant, it is designed as a relatively flexible zone, so that the occurring pressures are better absorbed.
The invention solves the task at hand with an intervertebral disk prosthesis featuring the characteristics of claim 1.
The reduction of the cross section which is orthogonal to the central axis, preferably occurs continuously and preferably towards the first exterior end of the object. The width of the object, measured vertically to the central axis, should also be reduced - preferably continuously - beginning from its centre towards the exterior end. In addition, the width may also be reduced towards the interior end, preferably continuously. In this manner an increased flexibility of the instruments far handling the implant is achieved.
In its centre the width of the object is typically wider by 50 % to 500 %, preferably by 100 % to 300 % compared with its interior and exterior end.
Thereby individual flexibility can be controlled and a larger bearing surface towards the cover plates of the vertebral bodies is achieved.
In a specific embodiment of the invention with the object in a spiral-wound state to the central axis, it features an upper spiral level and a lower spiral level, both of which arched in a convex-shape and suitable for application to the cover plates of two adjoint vertebral bodies. This achieves self-centering of the implant within the concave endplates of the vertebral bodies and a height increase of the application surface as well as a reduction of the specific surface pressures. Overall this results in a better transfer of forces to the anulus and the endplate.
Suitably, in its spiral-wound and unloaded state, the object has a gap which on the one hand facilitates the production of the object and on the other hand guarantees optimum flexibility. The gap should have a width of a minimum of 0.4 mm, preferably a minimum of 0.5 mm. On the other hand the gap should not exceed a maximum width of 1.0 mm, with the preferred maximum being 0.8 mm. Within these ranges an optimum memory effect of the object with spiral winding occurs.
In a specific embodiment of the invention, the object in its spiral-wound state -viewed from the spiral level - features an oval or kidney-shaped shape, preferably with a surface between 250 to 750 mm2 measured at the spiral level, which results in an optimum adjustment to the anatomical contributing conditions.
In a preferred embodiment of the invention the object contains a hydrogel or is even exclusively made up of hydrogel. Hydrogels are colloids in which the dispersal phase (colloid) has combined with the continuous phase (water) to form a viscous, gel-like compound, e.g. coagulated silicon acid. Compared with other materials this brings the benefit of releasing water when under pressure and absorbing water with load relief, which means it acts analogous to the natural nucleus.
Suitably, the object is manufactured using an injection-molding process whereby its injection point is preferably located in the area of the second end.
For the production this is an advantage in terms of the filling process.
Preferably the injection point is placed in a recessed position. Therefore, warping caused by pulling out the needle nozzle, does not occur on the surface but inside the recess.
In a specific embodiment of the invention the first end is designed asymmetrically towards the interior of the spiral. This results in the exterior form of the object with spiral winding to be rounded.
The object can be designed to be X-ray-opaque, preferably by using the additive barium sulfate. This allows checking the current position of the implant and monitoring any possible migration. For the same purpose the object may also contain X-ray-opaque components, preferably in the form of filaments, wires or tiny globes.
In a specific embodiment of the invention the last exterior turn of the spiral, amounting to at least 360° of the circumference of the spiral-wound object, has a thinner cross section when compared with the remaining spiral turns. As a result the exterior rim of the implant is more flexible in terms of the function of the implant.
In its centre the width of the object is typically wider by 50 % to 500 %, preferably by 100 % to 300 % compared with its interior and exterior end.
Thereby individual flexibility can be controlled and a larger bearing surface towards the cover plates of the vertebral bodies is achieved.
In a specific embodiment of the invention with the object in a spiral-wound state to the central axis, it features an upper spiral level and a lower spiral level, both of which arched in a convex-shape and suitable for application to the cover plates of two adjoint vertebral bodies. This achieves self-centering of the implant within the concave endplates of the vertebral bodies and a height increase of the application surface as well as a reduction of the specific surface pressures. Overall this results in a better transfer of forces to the anulus and the endplate.
Suitably, in its spiral-wound and unloaded state, the object has a gap which on the one hand facilitates the production of the object and on the other hand guarantees optimum flexibility. The gap should have a width of a minimum of 0.4 mm, preferably a minimum of 0.5 mm. On the other hand the gap should not exceed a maximum width of 1.0 mm, with the preferred maximum being 0.8 mm. Within these ranges an optimum memory effect of the object with spiral winding occurs.
In a specific embodiment of the invention, the object in its spiral-wound state -viewed from the spiral level - features an oval or kidney-shaped shape, preferably with a surface between 250 to 750 mm2 measured at the spiral level, which results in an optimum adjustment to the anatomical contributing conditions.
In a preferred embodiment of the invention the object contains a hydrogel or is even exclusively made up of hydrogel. Hydrogels are colloids in which the dispersal phase (colloid) has combined with the continuous phase (water) to form a viscous, gel-like compound, e.g. coagulated silicon acid. Compared with other materials this brings the benefit of releasing water when under pressure and absorbing water with load relief, which means it acts analogous to the natural nucleus.
Suitably, the object is manufactured using an injection-molding process whereby its injection point is preferably located in the area of the second end.
For the production this is an advantage in terms of the filling process.
Preferably the injection point is placed in a recessed position. Therefore, warping caused by pulling out the needle nozzle, does not occur on the surface but inside the recess.
In a specific embodiment of the invention the first end is designed asymmetrically towards the interior of the spiral. This results in the exterior form of the object with spiral winding to be rounded.
The object can be designed to be X-ray-opaque, preferably by using the additive barium sulfate. This allows checking the current position of the implant and monitoring any possible migration. For the same purpose the object may also contain X-ray-opaque components, preferably in the form of filaments, wires or tiny globes.
In a specific embodiment of the invention the last exterior turn of the spiral, amounting to at least 360° of the circumference of the spiral-wound object, has a thinner cross section when compared with the remaining spiral turns. As a result the exterior rim of the implant is more flexible in terms of the function of the implant.
Finally, the exterior end of the object can be fitted with aids suitable for gripping the intervertebral disk prosthesis using an inserting instrument, preferably in the form of indentations or protrusions.
The following describes the invention and extensions of the invention in more detail by means of schematic illustrations of an embodiment of the invention.
It shows Fig. 1 - a view shown in perspective of an intervertebral disk prosthesis in terms of the invention;
Fig. 2 shows a horizontal cross section through the intervertebral disk prosthesis as per Fig. 1;
Fig. 3 shows a cross section along the line III-111 in Fig. 2;
Fig. 4 - a side view of the intervertebral disk prosthesis as per Fig. 1;
Fig. 5 - an enlarged section of Fig. 3 in the area of the central injection point;
Fig. 6 - an enlarged view shown in perspective of the exterior end of the object with spiral winding as per Fig. 1; and Fig. 7 a variant of the exterior end of the object with spiral winding as per Fig.
1.
The intervertebral disk prosthesis 1 shown in Fig. 1 to 4 consists of a longitudinal, flexibility-yielding object 2 which may be spiral-wound with a first exterior end 3 and a second interior end 4 and a longitudinal central axis 5.
The cross section 10 which is orthogonal to the centre axis 5 of the object 2, is reduced continuously - as shown in Fig. 2 and 3 - towards the second interior end 4 as well as towards the first exterior end 3.
The measured width of object 2 in Fig. 2 at its interior end 4 amounts to circa 2.5 mm, at the exterior end 3 it is also circa 2.5 mm and in between towards the centre of the object it increases to up to circa 4.5 mm.
The measured height of the intervertebral prosthesis 1 measured in Fig. 3 corresponds to the anatomical intervertebral disk space. In the centre of the convex intervertebral disk prosthesis 1, the height on both sides protrudes by circa 0.5 to 3.0 in comparison to the sections located on the rim.
In a spiral-wound, unloaded state of object 2 - as shown in Fig. 1 and 2 -there is a gap of 0.65 mm between each individual spiral turn.
Essentially object 2 consists of an envelope of polycarbonate urethane and/or silicon polycarbonate urethane as well as of a filling of polyvinyl alcohol hydrogel. Further suitable materials both for the envelope as well as for its filling may be obtained from the pending International Patent Application PCT/CH01/00700.
Fig. 5 shows how injection point 9 is located in the area of the second end, which means nearly in the centre of the spiral-shaped object 2 and how it is recessed when compared with the upper spiral level 6.
Fig. 6 shows a possible variant of the exterior end 3 of object 2 with aids in the form of two grooves 11 located crossways to the central axis 5, which allow gripping the intervertebral disk prosthesis using a suitable insertion instrument, for example tongs.
Fig. 7 shows a second variant of the exterior end 3 of object 2 with aids, in this case in form of two shallow indentations 12 running crossways towards the central axis 5 as well as a slit 13 with a cylindrical counterdraft 14 positioned parallel to the central axis.
The following describes the invention and extensions of the invention in more detail by means of schematic illustrations of an embodiment of the invention.
It shows Fig. 1 - a view shown in perspective of an intervertebral disk prosthesis in terms of the invention;
Fig. 2 shows a horizontal cross section through the intervertebral disk prosthesis as per Fig. 1;
Fig. 3 shows a cross section along the line III-111 in Fig. 2;
Fig. 4 - a side view of the intervertebral disk prosthesis as per Fig. 1;
Fig. 5 - an enlarged section of Fig. 3 in the area of the central injection point;
Fig. 6 - an enlarged view shown in perspective of the exterior end of the object with spiral winding as per Fig. 1; and Fig. 7 a variant of the exterior end of the object with spiral winding as per Fig.
1.
The intervertebral disk prosthesis 1 shown in Fig. 1 to 4 consists of a longitudinal, flexibility-yielding object 2 which may be spiral-wound with a first exterior end 3 and a second interior end 4 and a longitudinal central axis 5.
The cross section 10 which is orthogonal to the centre axis 5 of the object 2, is reduced continuously - as shown in Fig. 2 and 3 - towards the second interior end 4 as well as towards the first exterior end 3.
The measured width of object 2 in Fig. 2 at its interior end 4 amounts to circa 2.5 mm, at the exterior end 3 it is also circa 2.5 mm and in between towards the centre of the object it increases to up to circa 4.5 mm.
The measured height of the intervertebral prosthesis 1 measured in Fig. 3 corresponds to the anatomical intervertebral disk space. In the centre of the convex intervertebral disk prosthesis 1, the height on both sides protrudes by circa 0.5 to 3.0 in comparison to the sections located on the rim.
In a spiral-wound, unloaded state of object 2 - as shown in Fig. 1 and 2 -there is a gap of 0.65 mm between each individual spiral turn.
Essentially object 2 consists of an envelope of polycarbonate urethane and/or silicon polycarbonate urethane as well as of a filling of polyvinyl alcohol hydrogel. Further suitable materials both for the envelope as well as for its filling may be obtained from the pending International Patent Application PCT/CH01/00700.
Fig. 5 shows how injection point 9 is located in the area of the second end, which means nearly in the centre of the spiral-shaped object 2 and how it is recessed when compared with the upper spiral level 6.
Fig. 6 shows a possible variant of the exterior end 3 of object 2 with aids in the form of two grooves 11 located crossways to the central axis 5, which allow gripping the intervertebral disk prosthesis using a suitable insertion instrument, for example tongs.
Fig. 7 shows a second variant of the exterior end 3 of object 2 with aids, in this case in form of two shallow indentations 12 running crossways towards the central axis 5 as well as a slit 13 with a cylindrical counterdraft 14 positioned parallel to the central axis.
Claims (19)
1. Intervertebral disk prosthesis or nuclear prosthesis (1) consisting of a longitudinal, flexibility-yielding object which can be wound in a spiral shape (2), with a first exterior end (3), a second interior end (4) and a longitudinal central axis (5), is characterised in that the cross-section (10) of the object (2) which is orthogonal towards the central axis (5) is reduced in size towards the second interior end (4).
2. Intervertebral disk prosthesis (1) as per claim 1 is characterised in that the orthogonal cross-section (10) is continuously reduced in size.
3. Intervertebral disk prosthesis (1) as per claim 1 or 2 is characterised in that the cross-section (10) of the object (2), which is orthogonal towards the central axis (5), is continuously reduced in size towards the first exterior end (3), preferably with the reduction occurring continuously.
4. Intervertebral disk prosthesis (1) as per one of the claims 1 to 3 is characterised in that the measured width of the object (2), running vertically towards the central axis (5), is reduced in size - viewed from its centre -towards the exterior end (3), preferably with the reduction occurring continuously.
5. Intervertebral disk prosthesis (1) as per one of the claims 1 to 4 is characterised in that the measured width of the object (2), running vertically towards the central axis (5), is reduced in size - viewed from its centre -towards the inner end (4), preferably with the reduction occurring continuously.
6. Intervertebral disk prosthesis (1) as per one of the claims 1 to 5 is characterised in that the width of the object (2) in its centre is wider by 50% to 500%, preferably wider by 100% to 300%, than at its interior and exterior ends (4,3).
7. Intervertebral disk prosthesis (1) as per one of the claims 1 to 6 is characterised in that the object (2) in its spiral-wound state towards the central axis (5) features an upper spiral level (6) and a lower spiral level (7), which are both curved in convex shapes and are suitable for application to the cover plates of two adjacent intervertebral disk spaces.
8. Intervertebral disk prosthesis (1) as per one of the claims 1 to 7 is characterised in that object (2) in a spiral-wound unloaded state features a gap between the spirals.
9. Intervertebral disk prosthesis (1) as per claim 8 is characterised in that the gap has a minimum width of 0.4 mm, preferably a minimum of 0.5 mm.
10. Intervertebral disk prosthesis (1) as per claim 8 or 9 is characterised in that the gap has a maximum width of 1,0 mm, preferably a maximum of 0,8 mm.
11. Intervertebral disk prosthesis (1) as per one of the claims 1 to 10 is characterised in that the object (2) in a spiral-wound state - viewed at the spiral level - features an oval or kidney-shaped shape, preferably with a surface between 250 to 750 mm2 measured at the spiral level.
12. Intervertebral disk prosthesis (1) as per one of the claims 1 to 11 is characterised in that object (2) contains a hydrogel and preferably consists completely of hydrogel.
13. Intervertebral disk prosthesis (1) as per one of the claims 1 to 9 is characterised in that object (2) is manufactured using an injection-molding process and its injection point (9) is positioned in the area of the second end (4).
14. Intervertebral disk prosthesis (1) as per claim 13 is characterised in that the injection point (9) is located in a recess vis-à-vis the upper spiral level (6).
15. Intervertebral disk prosthesis (1) as per one of the claims 1 to 14 is characterised in that the first end (3) is designed asymmetrically towards the interior of the spiral.
16. Intervertebral disk prosthesis (1) as per one of the claims 1 to 15 is characterised in that object (2) is X-ray-opaque, preferably achieved by using the additive barium sulfate.
17. Intervertebral disk prosthesis (1) as per one of the claims 1 to 16 is characterised in that object (2) contains X-ray-opaque components, preferably in the form of filaments, wires or tiny globes.
18. Intervertebral disk prosthesis (1) as per one of the claims 1 to 17 is characterised in that the last exterior spiral turn with a circumference of at least 360° of the spiral-wound object (2) features a thinner cross-section when compared with the remaining spiral turns.
19. Intervertebral disk prosthesis (1) as per one of the claims 1 to 18 is characterised in that the exterior end (3) of the object (2) is fitted with aids (11, 12, 13, 14), which are suited for gripping the intervertebral disk prosthesis (1) using an insertion instrument, preferably in the form of indentations or protrusions.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CH2002/000189 WO2003084444A1 (en) | 2002-04-04 | 2002-04-04 | Intervertebral prosthesis or nucleus replacement prosthesis |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2481375A1 true CA2481375A1 (en) | 2003-10-16 |
Family
ID=28679864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002481375A Abandoned CA2481375A1 (en) | 2002-04-04 | 2002-04-04 | Intervertebal prosthesis or nucleus replacement prosthesis |
Country Status (14)
| Country | Link |
|---|---|
| US (1) | US20050119750A1 (en) |
| EP (1) | EP1490000B1 (en) |
| JP (1) | JP2005521516A (en) |
| KR (1) | KR20050002927A (en) |
| CN (1) | CN1329009C (en) |
| AT (1) | ATE362354T1 (en) |
| AU (1) | AU2002242570A1 (en) |
| BR (1) | BR0215679A (en) |
| CA (1) | CA2481375A1 (en) |
| DE (1) | DE50210179D1 (en) |
| ES (1) | ES2287251T3 (en) |
| HU (1) | HUP0500171A2 (en) |
| IL (1) | IL164330A0 (en) |
| WO (1) | WO2003084444A1 (en) |
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| FR2863868B1 (en) * | 2003-12-22 | 2006-09-08 | Fournitures Hospitalieres Ind | INTERVERTEBRAL DISC PROSTHESIS |
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| FR2929502B1 (en) * | 2008-04-04 | 2011-04-08 | Clariance | NUCLEIC IMPLANT. |
| WO2009124269A1 (en) | 2008-04-05 | 2009-10-08 | Synthes Usa, Llc | Expandable intervertebral implant |
| CN101828978B (en) * | 2009-03-10 | 2012-11-21 | 法玛科技顾问股份有限公司 | Displacement spring and artificial intervertebral disk with displacement spring |
| US8535327B2 (en) | 2009-03-17 | 2013-09-17 | Benvenue Medical, Inc. | Delivery apparatus for use with implantable medical devices |
| US9526620B2 (en) | 2009-03-30 | 2016-12-27 | DePuy Synthes Products, Inc. | Zero profile spinal fusion cage |
| US9393129B2 (en) | 2009-12-10 | 2016-07-19 | DePuy Synthes Products, Inc. | Bellows-like expandable interbody fusion cage |
| US8979860B2 (en) | 2010-06-24 | 2015-03-17 | DePuy Synthes Products. LLC | Enhanced cage insertion device |
| US9907560B2 (en) | 2010-06-24 | 2018-03-06 | DePuy Synthes Products, Inc. | Flexible vertebral body shavers |
| TW201215379A (en) | 2010-06-29 | 2012-04-16 | Synthes Gmbh | Distractible intervertebral implant |
| US9402732B2 (en) | 2010-10-11 | 2016-08-02 | DePuy Synthes Products, Inc. | Expandable interspinous process spacer implant |
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| US11426290B2 (en) | 2015-03-06 | 2022-08-30 | DePuy Synthes Products, Inc. | Expandable intervertebral implant, system, kit and method |
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| JP6995789B2 (en) | 2016-06-28 | 2022-01-17 | イーアイティー・エマージング・インプラント・テクノロジーズ・ゲーエムベーハー | Expandable and angle adjustable intervertebral cage |
| US10888433B2 (en) | 2016-12-14 | 2021-01-12 | DePuy Synthes Products, Inc. | Intervertebral implant inserter and related methods |
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| US10940016B2 (en) | 2017-07-05 | 2021-03-09 | Medos International Sarl | Expandable intervertebral fusion cage |
| WO2019148083A1 (en) | 2018-01-29 | 2019-08-01 | Benvenue Medical, Inc. | Minimally invasive interbody fusion |
| WO2019178575A1 (en) | 2018-03-16 | 2019-09-19 | Benvenue Medical, Inc. | Articulated instrumentation and methods of using the same |
| US11446156B2 (en) | 2018-10-25 | 2022-09-20 | Medos International Sarl | Expandable intervertebral implant, inserter instrument, and related methods |
| US11426286B2 (en) | 2020-03-06 | 2022-08-30 | Eit Emerging Implant Technologies Gmbh | Expandable intervertebral implant |
| US11850160B2 (en) | 2021-03-26 | 2023-12-26 | Medos International Sarl | Expandable lordotic intervertebral fusion cage |
| US11752009B2 (en) | 2021-04-06 | 2023-09-12 | Medos International Sarl | Expandable intervertebral fusion cage |
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| US5716416A (en) * | 1996-09-10 | 1998-02-10 | Lin; Chih-I | Artificial intervertebral disk and method for implanting the same |
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| DE50106944D1 (en) * | 2000-05-26 | 2005-09-08 | Zimmer Gmbh Winterthur | Intervertebral disc replacement for the nucleus of an intervertebral disc |
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| CA2323252C (en) * | 2000-10-12 | 2007-12-11 | Biorthex Inc. | Artificial disc |
-
2002
- 2002-04-04 HU HU0500171A patent/HUP0500171A2/en unknown
- 2002-04-04 BR BR0215679-2A patent/BR0215679A/en not_active IP Right Cessation
- 2002-04-04 DE DE50210179T patent/DE50210179D1/en not_active Expired - Fee Related
- 2002-04-04 ES ES02708118T patent/ES2287251T3/en not_active Expired - Lifetime
- 2002-04-04 CN CNB028289439A patent/CN1329009C/en not_active Expired - Fee Related
- 2002-04-04 KR KR10-2004-7015801A patent/KR20050002927A/en not_active Application Discontinuation
- 2002-04-04 CA CA002481375A patent/CA2481375A1/en not_active Abandoned
- 2002-04-04 IL IL16433002A patent/IL164330A0/en unknown
- 2002-04-04 EP EP02708118A patent/EP1490000B1/en not_active Expired - Lifetime
- 2002-04-04 JP JP2003581689A patent/JP2005521516A/en active Pending
- 2002-04-04 AU AU2002242570A patent/AU2002242570A1/en not_active Abandoned
- 2002-04-04 WO PCT/CH2002/000189 patent/WO2003084444A1/en active IP Right Grant
- 2002-04-04 AT AT02708118T patent/ATE362354T1/en not_active IP Right Cessation
- 2002-04-04 US US10/509,931 patent/US20050119750A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| EP1490000A1 (en) | 2004-12-29 |
| JP2005521516A (en) | 2005-07-21 |
| HUP0500171A2 (en) | 2005-05-30 |
| CN1329009C (en) | 2007-08-01 |
| KR20050002927A (en) | 2005-01-10 |
| IL164330A0 (en) | 2005-12-18 |
| BR0215679A (en) | 2005-02-01 |
| ES2287251T3 (en) | 2007-12-16 |
| EP1490000B1 (en) | 2007-05-16 |
| US20050119750A1 (en) | 2005-06-02 |
| AU2002242570A1 (en) | 2003-10-20 |
| DE50210179D1 (en) | 2007-06-28 |
| ATE362354T1 (en) | 2007-06-15 |
| WO2003084444A1 (en) | 2003-10-16 |
| CN1625373A (en) | 2005-06-08 |
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| Date | Code | Title | Description |
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| EEER | Examination request | ||
| FZDE | Discontinued |