EXPANDABLE MODULAR INTERVERTEBRAL IMPLANT Russian patent published in 2024 - IPC A61F2/44 

FIELD: medicine.

SUBSTANCE: bone fusion device intended for insertion between upper and lower vertebrae, includes at least one folding sliding element containing a support part with proximal and distal ends, and lateral sides. At least one folding sliding element is made with possibility of dynamic change of dimensions of device for bone fusion to increase the volume of the bone fusion device. Bone fusion device is actuated at the proximal end of the support portion by means of a detachable tool to advance the distal end of the support portion to increase the interstitial space between the upper and lower vertebrae, in order to deliver the device to the implantation site. Device is in a compact form of the first form factor, the first surface area of which is in contact with the upper and lower vertebrae, and the first volume is located inside the interstitial space. At least one extending element is rotatable by means of a detachable tool from a folded position outward in a direction from one of the lateral sides of the support portion and an abutment against at least one of the upper vertebra and the lower vertebra and expanding the bone fusion device into a second form factor, having a second surface area in contact with the upper vertebra and lower vertebrae, and a second volume in the interstitial space. Dynamically varying prismatic element for use in an intervertebral implantable device for bone fusion comprises an interlocking modular element, at least one folded structural element and an engaging part. Coupling modular element passes through the distal and proximal ends of the device and has at least one folded structural element connected to it, for each of which geometric shapes and holes are provided. At least one folded structural element is pivotally connected to the interlocking modular element, which enables to use it in the folded position and to be inserted between the upper and lower vertebrae, as well as in the unfolded position for dynamic change of the device form factor. Engaging part is located at the distal end of the device. Coupling modular element is configured to be actuated at the proximal end by means of a detachable tool to advance the engaging portion to increase the interstitial space between the upper and lower vertebrae, thereby allowing the device to be delivered to the implantation site, wherein the device is provided in the form of a compact first form factor, the first surface area of which is in contact with the upper and lower vertebrae, and the first volume is located inside the interstitial space. Device is made with possibility of lateral opening using detachable tool on coupled modular element and folded structural element so as to transform from a compact first form factor into a decomposed second form factor, which implies a decomposed device with an increased second volume, and a larger second surface area compared to the first form factor. Method of implantation of dynamically transforming intervertebral implantable device for bone fusion includes the following stages: separation of the upper and lower vertebrae to move the device in the interstitial space between the upper and lower vertebrae to the implantation site; inserting the device into the interstitial space in a compact configuration of a first form factor; rotating the device around the axis in a first direction so that the folded structure can rotate in a lateral direction; rotation of the folded structure around the axis in the same first direction in order to unfold the folded structure so that it opens laterally outward from the device for transition to the second form factor; as well as fastening of the unfolded structure at the implantation point in the configuration of the second form factor in order to provide a larger surface area and volume within the surrounding interstitial space between the superior and inferior vertebrae. Method of implantation of dynamically transforming intervertebral implantable device for bone fusion includes the following stages: separation of the upper and lower vertebrae to move the device in the interstitial space between the upper and lower vertebrae to the implantation site; inserting the device into the interstitial space in a compact configuration of a first form factor; rotating the device around the axis in a first direction so that the folded structure can rotate in a lateral direction; rotation of the folded structure around the axis in the second direction opposite to the first one in order to unfold the folded structure and thus to provide its lateral opening in the outward direction from the device for transition to the second form factor; as well as fastening of the unfolded structure at the implantation point in the configuration of the second form factor in order to provide a larger surface area and volume within the surrounding interstitial space between the superior and inferior vertebrae.

EFFECT: inventions provide the possibility of increasing the volume of the interbody cage from the first folded or folded position to the second opened or unfolded position in such a way that the perimeters of the contact surfaces between the interbody cage and the vertebrae increased from the folded position to the unfolded position of the cage.

12 cl, 94 dwg