Fracture reduction mechanism for pelvic fracture minimally invasive surgery

A fracture reduction mechanism for minimally invasive pelvic fracture surgery, wherein:

• the fracture reduction mechanism comprises a support assembly, a drive assembly, a self-rotating clamping assembly, and a healthy side fixation assembly;
• wherein,
• the drive assembly comprises a synchronous rotation module, a first ball screw module, a second ball screw module, a third ball screw module, and an arc guide rail module;
• the first ball screw module can drive the self-rotating clamping assembly and the pelvic fracture block held thereby to move horizontally, enabling the fracture ends to separate and unlock, providing movement space for precise reduction of the fracture block;
• the support assembly is symmetrically arranged on the bedside rails on both sides of the operating table and slidably connected therewith, capable of translating along the bedside rail and in a direction perpendicular to the bed surface, reducing displacement of the fracture ends and implementing rough fracture reduction;
• the drive assembly drives the self-rotating clamping assembly to perform six degrees of freedom movement, implementing precise fracture reduction;
• the fracture reduction mechanism forms a frame-like closed structure through connection with the operating table via the bedside rail, through which the mechanism can utilize the operating table to provide self-counteracting stress;
• the synchronous rotation module is hinged with a U-shaped slot at the upper end of the column of the support assembly;
• the first ball screw module is arranged along the short axis direction of the bed, with both ends fixedly connected to the upper end of the upper support arm of the synchronous rotation module;
• the arc guide rail module is arranged along the short axis direction of the bed, the arc rack guide rail plane of the arc guide rail module is parallel to the base plane of the first ball screw module and located in front of it, mounted on the sliding platform of the first ball screw module through a bottom plate fixing ring;
• the second ball screw module is arranged in front of the arc guide rail module and parallel to the arc rack guide rail plane, connected to the arc guide rail sliding platform of the arc guide rail module through the sliding platform of the second ball screw module;
• the third ball screw module is arranged below the second ball screw module and perpendicular to the second ball screw module, connected to the lower support plate of the second ball screw module through the sliding platform of the third ball screw module;
• the movement of the ball screw module and arc guide rail module is controlled by ball screw nuts and rack and pinion;
• the self-rotating clamping assembly is located in front of the third ball screw module and fixedly installed on its front support plate, used for clamping the holding screw inserted into the pelvic fracture block, driving the pelvic fracture block to rotate about a fixed axis;
• the rotation axes of the three fixed-axis rotation components including the self-rotating clamping assembly, arc guide rail module, and synchronous rotation module intersect at one point, which is the rotation center of the entire mechanism;
• by manually adjusting the linear motion distances of the first, second, and third ball screw modules, the pelvic fracture block can be controlled to move linearly along the bed short axis direction, the arc rack guide rail radial direction, and the arc rack guide rail axial direction;
• by manually adjusting the rotation angles of the synchronous rotation module and arc guide rail module, the fracture block can be controlled to rotate about fixed axes along the bed short axis and arc rack guide rail axis;
• through the above mechanism, six degrees of freedom translation and rotation of the pelvic fracture block can be achieved;
• the healthy side fixation assembly is slidably connected with the bedside rail, used for fixing the healthy side hemipelvis.