DEVICE FOR INTERSPINAL SPONDILODESISES Russian patent published in 2023 - IPC A61B17/70 

FIELD: intervertebral prostheses.

SUBSTANCE: invention relates to a device that can be percutaneously implanted between adjacent vertebral spinous processes of a living being for the immovable connection of vertebrae to each other, obtaining fusion, besides, the invention includes a device system for interspinous fusion and instruments for its introduction in a minimally invasive way. Device (1) for interspinous fusion contains a central body defining the longitudinal direction; a proximal body and a distal body opposite each other relative to the said central body; a pair of near clamps (21, 22) and a pair of distant clamps (23, 24), opposite to each other relative to the central body, spaced apart from each other along the longitudinal direction; a proximal and distal housing actuating system configured to be percutaneously actuated to cause relative linear motion and cause the clamps (21, 22, 23, 24) to rotate about the proximal and distal housings such that the clamps (21, 22, 23, 24) perform a move from a closed configuration to an open configuration; connecting rods that connect the central body to a pair of near clamps (21, 22) and a pair of distant clamps (23, 24). The central body is configured to be inserted between two adjacent spinous processes (100, 110). The near body and the far body are made with the possibility of rectilinear movement towards each other along the longitudinal direction. A pair of proximal clamps (21, 22) and a pair of distal clamps (23, 24) contain a first end connected by hinges to the proximal body and to the distal body, and a second end configured to abut the spinous processes (100, 110). The connecting rods comprise the first hinge points on the said central body and the second hinge points on a corresponding clamp (21, 22, 23, 24). The second ends in the closed clamp configuration are located at a first distance from the first hinge points and at a second distance from the corresponding second hinge points, respectively. The first distance is shorter than the second distance so that when the clamps (21, 22, 23, 24) are moved from a closed configuration to an open configuration, the second ends move substantially transverse to the longitudinal axis and minimize entrapment of biological tissue between the second ends of the clamps and the spinous processes. (100, 110). The system for interspinous fusion contains the above-described device for interspinous fusion and an insertion device (200). The input device (200) includes an input tube (202) configured to be inserted between two spinous processes (100, 110). The introduction tube (202) contains a distal end. The insertion tube (202) is configured to guide the interspinous fusion device while the interspinous fusion device protrudes from the distal end of the insertion tube (202). The inlet tube (202) includes two rigid wings (206, 207) extending from the distal end. The rigid wings (206, 207) are oriented in such a way that when the interspinous fusion device protrudes from the distal end, the interspinous fusion device is freely movable from a closed configuration to an open configuration in a predetermined fusion plane comprising a longitudinal direction, and the rigid wings (206, 207) are located parallel to the specified plane of spinal fusion. The interspinous fusion device is easy to manufacture, easy to operate, easy to center between the spinous processes, can be inserted between the spinous processes with minimal effort, it contains very few parts to assemble, allows to perform precise symmetrical movement to secure the clamps to the spinous processes, holds firmly spinous processes, so that a durable fusion can be obtained. The interspinous fusion device traps a minimal amount of tissue between the prosthesis and the spinous processes when the device is locked onto the spinous processes.

EFFECT: interspinous fusion device and minimally invasive implant instrumentation system allow the interspinous fusion device to be inserted between the spinous processes with minimal effort.

15 cl, 27 dwg