Intervertebral disk prosthesis
View Patent ↗Intervertebral disk prosthesis comprising an external waterproof multilayered deformable casing surrounding a peripheral partition membrane delimiting an outer space and an inner cavity, wherein the inner cavity is partitioned by vertical walls delimiting at least four cavity compartments configured to be filled with a non-toxic saline solution, and wherein the vertical walls comprise orifices and/or porous membranes configured to induce the saline solution to flow from one cavity compartment toward another upon heterogeneous application of a pressure comprised between 0.05 and 3 MPa in a duration comprised between 10 seconds and 60 minutes, and to revert back to its native compartment upon removal of said pressure in a duration comprised between 10 seconds and 180 minutes, and wherein the walls are distributed asymmetrically in the inner cavity so that a posterior part of the inner cavity comprises fewer and/or larger cavity compartments than an anterior part of the inner cavity.
1 . Intervertebral disk prosthesis comprising an external multilayered casing surrounding an internal membrane delimiting an outer space and an inner cavity,
wherein the multilayered casing comprises four layers, the four layers including an external most layer reinforced with a rigid material, two intermediate layers as a radial backbone, and a flexible and waterproof innermost layer,
wherein the inner cavity is partitioned by vertical walls delimiting at least four cavity compartments configured to be filled with a non-toxic saline solution,
wherein the vertical walls comprise porous membranes configured to induce the saline solution to flow from one cavity compartment toward another upon heterogeneous application of a pressure comprised between 0.05 and 3 MPa in a duration comprised between 10 seconds and 60 minutes, and to revert back to its native compartment upon removal of said pressure in a duration comprised between 10 seconds and 180 minutes,
wherein the vertical walls are distributed asymmetrically in the inner cavity so that a posterior part of the inner cavity comprises larger cavity compartments than an anterior part of the inner cavity, and
wherein the vertical walls are anchored into the external most layer of the multilayered casing.
2 . Intervertebral disk prothesis according to claim 1 , wherein the inner cavity comprises pressure sensors.
3 . Intervertebral disk prothesis according to claim 1 , wherein the vertical walls comprise at least one vertical wall presenting a tubular shape.
4 . Intervertebral disk prothesis according to claim 1 , wherein a density of the non-toxic saline solution in the inner cavity is constant.
5 . Intervertebral disk prothesis according to claim 1 , wherein the vertical walls comprise orifices with a dimension between 1 mm and 6 mm.
6 . Intervertebral disk prothesis according to claim 1 , wherein the external casing is made of a 3D printable material.
7 . Intervertebral disk prothesis according to claim 1 , wherein the vertical walls are made of the same material as the internal membrane.
8 . Intervertebral disk prothesis according to any claim 1 , wherein the non-toxic saline solution is physiological serum.
9 . Intervertebral disk prothesis according to claim 1 , further comprising sensors configured to measure parameters of the intervertebral disk prothesis and wirelessly communicate the parameters to an external device, wherein said parameters are selected from a group consisting of pressure, pH, and salinity.
10 . Intervertebral disk prosthesis of claim 1 , wherein the rigid material includes polyester, polyethylene, or a mixture thereof.
11 . Method for filling an intervertebral disk prothesis according to claim 1 , wherein it comprises the step of measuring the pressure during the filling of the intervertebral disk prothesis.
12 . Method for positioning an intervertebral disk prothesis according to claim 1 between two cervical vertebrae wherein the intervertebral disk prothesis is filled with the non-toxic saline solution before being positioned between the two vertebrae.
13 . Method for positioning an intervertebral disk prothesis according to claim 1 between two lumbar vertebrae wherein the intervertebral disk prothesis is filled with the non-toxic saline solution after being positioned between the two vertebrae.
14 . Method for positioning an intervertebral disk prothesis according to claim 1 between two vertebrae wherein a probe is used to monitor the pressure during the positioning of the intervertebral disk prosthesis.
15 . Method for positioning an intervertebral disk prothesis according to claim 14 , wherein the probe is left in place at the end of the positioning.
16 . Medical treatment comprising replacing a defective intervertebral disk of a patient with a intervertebral disk prothesis according to claim 1 , wherein the maximum pressure applied on the defective intervertebral disk without lifting any charge is calculated based on the weight and height of the patient and the dimensions of orifices defined in the vertical walls are configured to induce the saline solution to flow from one cavity compartment toward another upon heterogeneous application of said calculated pressure in a duration comprised between 10 seconds and 60 minutes, and to revert back to its native compartment upon removal of said pressure in a duration comprised between 10 seconds and 180 minutes.