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EP1399100A1 - Prothese de disque intervertebral - Google Patents

Prothese de disque intervertebral

Info

Publication number
EP1399100A1
EP1399100A1 EP01940051A EP01940051A EP1399100A1 EP 1399100 A1 EP1399100 A1 EP 1399100A1 EP 01940051 A EP01940051 A EP 01940051A EP 01940051 A EP01940051 A EP 01940051A EP 1399100 A1 EP1399100 A1 EP 1399100A1
Authority
EP
European Patent Office
Prior art keywords
intervertebral disc
disc prosthesis
prosthesis according
solution
semipermeable membrane
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01940051A
Other languages
German (de)
English (en)
Inventor
Armin Studer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Synthes GmbH
Original Assignee
Mathys Medizinaltechnik AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mathys Medizinaltechnik AG filed Critical Mathys Medizinaltechnik AG
Publication of EP1399100A1 publication Critical patent/EP1399100A1/fr
Withdrawn legal-status Critical Current

Links

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
    • A61F2/441—Joints for the spine, e.g. vertebrae, spinal discs made of inflatable pockets or chambers filled with fluid, e.g. with hydrogel
    • 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
    • A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/3006—Properties of materials and coating materials
    • A61F2002/3008—Properties of materials and coating materials radio-opaque, e.g. radio-opaque markers
    • 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
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30581—Special structural features of bone or joint prostheses not otherwise provided for having a pocket filled with fluid, e.g. liquid
    • 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
    • A61F2/30721—Accessories
    • A61F2/30734—Modular inserts, sleeves or augments, e.g. placed on proximal part of stem for fixation purposes or wedges for bridging a bone defect
    • A61F2002/30738—Sleeves
    • 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
    • A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
    • A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
    • A61F2002/30772—Apertures or holes, e.g. of circular cross section
    • A61F2002/30784—Plurality of holes
    • 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
    • A61F2/3094—Designing or manufacturing processes
    • A61F2/30942—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques
    • A61F2002/30957—Designing or manufacturing processes for designing or making customized prostheses, e.g. using templates, CT or NMR scans, finite-element analysis or CAD-CAM techniques using a positive or a negative model, e.g. moulds
    • 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
    • A61F2002/444—Intervertebral or spinal discs, e.g. resilient for replacing the nucleus pulposus
    • 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
    • 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
    • A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
    • A61F2250/0096—Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers
    • A61F2250/0098—Markers and sensors for detecting a position or changes of a position of an implant, e.g. RF sensors, ultrasound markers radio-opaque, e.g. radio-opaque markers

Definitions

  • the invention relates to an intervertebral disc prosthesis or a nucleus replacement prosthesis according to the preamble of claim 1.
  • intervertebral disc prostheses are already known from the prior art, including those that are able to absorb water to a certain degree in order to increase the volume.
  • none of the known intervertebral disc prostheses is able to reversibly adapt their volume and shape to a certain extent due to the external conditions, in particular the external forces and loads acting on the prosthesis.
  • the invention seeks to remedy this.
  • the invention has for its object to provide an intervertebral disc prosthesis or a nucleus replacement prosthesis which is capable of taking a greater or lesser height - based on the spine - in a reversible manner depending on the load condition (e.g. in the lying or standing patient).
  • the invention solves this problem with an intervertebral disc prosthesis or a nucleus replacement prosthesis, which has the features of claim 1. Due to the semipermeable membrane of the prosthesis according to the invention, it is in a position in the implanted state depending on the external circumstances, i.e. whether the patient is standing, standing or additional stresses on the spine (e.g. carrying loads or sports activities), its height, shape and elasticity adjust in a reversible manner. Since the prosthesis according to the invention is filled with a solution of a substance - preferably common salt - whose concentration is higher than the body fluid, it tries to absorb water from the surrounding body fluid due to the osmotic effect in order to dilute or equalize the concentration. This increases their volume.
  • the advantages achieved by the invention can essentially be seen in the fact that, thanks to the prosthesis according to the invention, the natural process of water absorption or water release in the healthy intervertebral disc is realized with the same principle of osmosis.
  • the prosthesis' cushioning effect also corresponds to the natural intervertebral disc.
  • This damping can be optimized by the concentration of the solution (saline solution) as well as the wall thickness or the thickness of the jacket design.
  • the distraction forces that are transferred from the active implant to the spine help to tighten the annulus and thus also introduce new stiffness into the spine movement segment.
  • the jacket comprises the semipermeable membrane and has a jacket surrounding the membrane made of a biocompatible material. This tight covering protects the patient's body from the escape of potentially toxic substances that could possibly arise during a life span of the implant of over 20 years.
  • the sheathing consists of a polymer, preferably polycarbonate-urethanes, silicone-polycarbonate-urethanes or silicone-polyether urethanes. These materials have proven to be particularly suitable because of their good physical tolerance.
  • the polymer can also be an X-ray contrast medium, such as. B. Barium sulfate can be added.
  • the intervertebral disc prosthesis can consist of a uniform material or alternatively of two or more different materials.
  • the material of the sheathing which surrounds the semipermeable membrane is welded to one another by an injection process, a first partial sheathing obtained in a first injection molding preferably being completed with injection molding technology to form a compact intervertebral disc prosthesis.
  • the casing expediently has a number of perforations, so that it forms a system that is open to the outside.
  • the osmotic exchange can also be influenced or controlled via these perforations.
  • Sheathing forms a closed system to the outside.
  • the intervertebral disc prosthesis can, for example, be lenticular or balloon-shaped.
  • the advantage of these forms is that the prosthesis takes up a small volume in the collapsed state and takes up a large volume after being filled with a suitable solution.
  • the filled balloon releases the pressure on the implant evenly strongly on all sides, or absorbs the pressure evenly.
  • the intervertebral disc prosthesis is advantageously modeled on a natural intervertebral disc.
  • the jacket of the intervertebral disc prosthesis can consist of a spiral, serpentine or helical, longitudinal container.
  • the advantage of this shape lies in the comparatively small entry opening required to insert this implant into the intervertebral space. It is particularly advantageous if the jacket comprises a material with shape memory.
  • the cavity of the intervertebral disc prosthesis is either filled with a solution of a substance in water (or another solvent) before the implantation or is subsequently filled into the empty semipermeable container through a suitable valve.
  • the solute is preferably an inorganic salt (e.g. sodium chloride) or a sugar.
  • the advantage of using sodium chloride lies in the fact that this is physiologically harmless, so that even with a leaky prosthesis, no harmful substances would leak into the body.
  • the solution can also consist of a hydrogel.
  • Hydrogels are colloids whose disperse phase (colloid) is combined with the continuum phase (water), so that a viscous, gel-like product is created. Source control via hydrogel further optimizes the osmosis effect.
  • the solution can also comprise polymeric or copolymeric substances.
  • the concentration of the solution of a substance should expediently be at least 0.9%, preferably at least 2.0%.
  • the molarity of the solution of a substance should expediently be at least 0.155 mol / liter, preferably at least 0.3 mol / liter.
  • the molarity of the solution of a substance should be at most 3 mol / liter, preferably at most 5 mol / liter.
  • the solution can additionally contain X-ray contrast media, preferably in liquid form, in order to make the implanted intervertebral disc prosthesis radiopaque.
  • the semipermeable membrane can consist of parchment paper, pig bladder material or a polymer, preferably a silicone.
  • the semipermeable membrane is preferably designed as a quasi-tight bag which is filled with a salt or sugar solution and is enclosed by a sheath.
  • the minimum height of the intervertebral disc prosthesis is 4 mm, preferably 5 mm, the maximum height 15 mm, preferably 12 mm.
  • Intervertebral disc prosthesis is 0.5 cm 3 , preferably 0.8 cm 3 , the maximum volume 5 cm 3 , preferably 4 cm 3 .
  • the maximum height increase of the prosthesis due to water absorption is 8 mm, preferably 5 mm.
  • the jacket is equipped with a valve, so that the jacket can be implanted in the collapsed state through a laparoscope in the intervertebral region and can then be filled with an aqueous salt or sugar solution through the valve.
  • the valve is expediently attached to the periphery of the intervertebral disc prosthesis.
  • a reservoir for pure solvent is provided between the semipermeable membrane enclosing the cavity and its casing.
  • Figure 1 shows a cross section through two adjacent vertebral bodies with a prosthesis according to the invention balloon-like shape.
  • FIG. 2 shows a plan view of a prosthesis according to the invention with a balloon-like shape, which lies on the cover plate of a vertebral body;
  • FIG. 3 shows a top view of a screw-shaped prosthesis according to the invention on the cover plate of a vertebral body
  • FIG. 4 shows a cross section through a turn of the prosthesis according to FIG. 3 in the loaded state
  • FIG. 5 shows a cross section through a turn of the prosthesis according to FIG. 3 in the unloaded state or in the swollen state;
  • FIGS. 4 and 5 shows a top view of the first partial sheathing of the prosthesis according to FIGS. 4 and 5;
  • FIG. 7 shows a cross section along the line Vll-Vll in Fig. 6 .
  • FIG. 8 is a side view of the first partial casing according to FIG. 6;
  • FIG. 9 shows a plan view of the spiral, semi-permeable membrane in the form of a bubble of the prosthesis according to FIGS. 4 and 5;
  • FIG. 10 shows a side view of the semipermeable membrane according to FIG. 9;
  • FIGS. 4 and 5 are plan views of the completely covered prosthesis according to FIGS. 4 and 5;
  • FIG. 12 shows a cross section along the line Xll-Xll in FIG. 11;
  • FIG. 13 shows a side view of the completely covered prosthesis according to FIG. 11 in the direction of the arrows Xlll / Xlll;
  • FIG. 14 shows a cross section along the line XIV-XIV in FIG. 13.
  • nucleus replacement prosthesis 1 shows a nucleus replacement prosthesis 1 according to the invention in its simplest embodiment, in which the jacket 3 consists entirely of a semipermeable membrane which, as a lenticular bag, encloses a cavity 2 which is filled with an aqueous sodium chloride solution.
  • the nucleus replacement prosthesis 1 is implanted in the place of the previously removed, damaged natural nucleus pulposus, between two adjacent vertebral bodies 6, 7.
  • the nucleus replacement prosthesis 1 has a closable valve 8, so that the intervertebral disc prosthesis can be implanted in the unfilled, collapsed state through a corresponding cannula in a minimally invasive manner and only then - via the valve 8 - filled with the aqueous sodium chloride solution and can be brought into their lenticular shape.
  • valve 8 can also be omitted and the lenticular bag can be filled with an aqueous sodium chloride solution right from the start.
  • the nucleus replacement prosthesis 1 thus produced must then be brought into the intervertebral space when it is filled.
  • FIG. 2 shows a variant of a nucleus replacement prosthesis 10, which consists of a lenticular sack made of several materials, a thick-walled plastic in the zones of contact with the end plates of the vertebral bodies and a thin-walled, semi-permeable plastic for the lateral lateral surfaces.
  • FIG. 3 shows a formal variant of a nucleus replacement prosthesis 20, which has a spiral shape instead of the lenticular one.
  • the individual spiral windings can — as shown in FIG. 3 — have an intermediate space 19 or also lie close to one another.
  • this intervertebral disc prosthesis 20 can also be provided with a valve attached to the outer end of the spiral, through which valve - after implantation - a sodium chloride solution can be filled.
  • nucleus replacement prostheses 1, 10, 20 shown in FIGS. 1 to 3 can have an outer sheath in addition to the semipermeable membrane 3 in order to protect the semipermeable membrane 3.
  • the sheathing can be formed from a single layer or also in multiple layers. Such an embodiment (sandwich structure) encased in two layers is described in detail below with reference to FIGS. 4 and 5.
  • FIG. 4 shows a cross section running orthogonally to the spiral axis 9 through a turn of such a covered, spiral-shaped nucleus replacement prosthesis 20 (FIG. 3).
  • the height of the nucleus replacement prosthesis 20 can be 4 to 15 mm (typically 8 mm).
  • the cavity 2 filled with an aqueous sodium chloride solution is completely enclosed by the relatively thin semipermeable membrane 3.
  • the latter is enclosed by a first partial casing 5 and a second partial casing 4.
  • Both sheaths 4, 5 consist of a biocompatible, biostable material, for example of a polymer, in particular of silicone, polyurethane, polycarbonate urethane, silicone polycarbonate urethane or silicone polyether urethane.
  • All polymeric materials can also be mixed with barium sulfate to make them radiopaque.
  • the semipermeable membrane 3 itself is not macro-perforated, but due to its structure allows the small water molecules to pass in both directions, ie into and out of the cavity 2, during which it is impermeable to the larger sodium and chloride ions.
  • lateral bores can also be made in the casings 4, 5 (not shown in the drawing).
  • the top 12 and bottom 13 of the nucleus replacement prosthesis 20 shown in FIG. 5, in the unloaded state - still or during the osmosis effect - have a convex bulge with respect to the spiral axis 9.
  • an osmotic effect - as produced by the aqueous saline solution in the cavity 2 - arises - the opposite effect (absorption of water molecules from the lower concentrated body fluid into the more concentrated salt solution of the cavity 2 through the semipermeable membrane 3, indicated by the arrow 14), which consists in that water molecules from the cavity 2 are pressed outwards through the semipermeable membrane 3 - indicated by the arrow 15 - until Equilibrium between the two effects occurs (reversible osmosis).
  • the convex top 12 and bottom 13 of the nucleus replacement prosthesis 20 shown are partially or completely flattened, as shown in FIG.
  • a possible production of the nucleus replacement prosthesis 20 is also explained with reference to FIGS. 6-14.
  • the first partial casing 5 is shown as an upwardly open spiral.
  • the spiral double wall 16 is bridged by a plurality of U-shaped webs 17, so that a spiral, perforated receiving channel 18 for a spiral sack shown in FIGS. 9 and 10 is formed from a semipermeable membrane 3.
  • This first partial casing 5 is produced in a first injection mold. After inserting the spiral-shaped sack filled with an aqueous saline solution and a liquid X-ray contrast medium from a semipermeable membrane 3 into the first partial sheathing 5, the so prepared, Intermediate component inserted in a further (second) injection mold in order to close the gaps and openings of the first partial sheathing 5 that still exist by a second injection process.
  • the resulting second partial sheathing 4 completely complements the first partial sheathing 5, so that through this second injection molding process the spiral-shaped bag filled with saline solution with the semipermeable membrane 3 is completely enclosed by the complementary sheathing 4, 5, so that the 14, compact intervertebral disc prosthesis 20 shown.
  • the saline solution filled in the cavity 2 can now adapt its concentration and volume to the external stress conditions of the implanted intervertebral disk prosthesis 20, which is surrounded by body fluid, in accordance with the principle of reversible osmosis.

Landscapes

  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Engineering & Computer Science (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Vascular Medicine (AREA)
  • Dispersion Chemistry (AREA)
  • Cardiology (AREA)
  • Chemical & Material Sciences (AREA)
  • Transplantation (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Neurology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Prostheses (AREA)

Abstract

La présente invention concerne une prothèse de disque intervertébral ou une prothèse de substitution de noyau, qui présente une enveloppe (3, 4, 5) au moins partiellement souple, comprenant une cavité (2) de configuration variable. Ladite enveloppe (3, 4, 5) est au moins partiellement conçue sous forme de membrane semi-perméable (3) à un solvant, ce qui permet à une solution d'une substance remplissant la cavité (2) de pouvoir adapter sa concentration et son volume aux états de contrainte externes, selon le principe de l'osmose inverse.
EP01940051A 2001-06-27 2001-06-27 Prothese de disque intervertebral Withdrawn EP1399100A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CH2001/000403 WO2003002040A1 (fr) 2001-06-27 2001-06-27 Prothese de disque intervertebral

Publications (1)

Publication Number Publication Date
EP1399100A1 true EP1399100A1 (fr) 2004-03-24

Family

ID=4358216

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01940051A Withdrawn EP1399100A1 (fr) 2001-06-27 2001-06-27 Prothese de disque intervertebral

Country Status (5)

Country Link
US (1) US20040220669A1 (fr)
EP (1) EP1399100A1 (fr)
JP (1) JP2004530509A (fr)
AU (1) AU2001273767B2 (fr)
WO (1) WO2003002040A1 (fr)

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JP2003530131A (ja) 1999-03-07 2003-10-14 ディスクレ リミテッド コンピューターを利用する手術方法及び装置
EP1432371B1 (fr) * 2001-10-02 2009-07-08 Rex Medical, L.P. Implant vertebral
US6793678B2 (en) 2002-06-27 2004-09-21 Depuy Acromed, Inc. Prosthetic intervertebral motion disc having dampening
MXPA05008653A (es) 2003-02-14 2006-04-27 Depuy Spine Inc Dispositivo de fusion intervertebral formado in situ.
US20040267367A1 (en) 2003-06-30 2004-12-30 Depuy Acromed, Inc Intervertebral implant with conformable endplate
CA2558661C (fr) 2004-02-06 2012-09-04 Georgia Tech Research Corporation Dispositif biocompatible porteur
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