Surgical instruments: spiral joint mechanism and spinal minimally invasive surgery spreader

Abstract

This invention relates to a spinal minimally invasive surgery retractor, comprising: a main rod assembly having a left main rod and a right main rod, serving as the main body of the spinal minimally invasive surgery retractor; the front end of the left main rod having a helical shaft joint mechanism; the front end of the right main rod having another helical shaft joint mechanism; a cylindrical assembly rotatably connected to the main rod assembly, having a left cylinder and a right cylinder for retracting and maintaining the wound area; a retracting knob, locked to a retracting screw hole on the side of the main rod assembly, for simultaneously and symmetrically adjusting the retracting angle of the left and right cylinders; and a tail-end main rod screwed to a tail-end fixing member to engage with the main rod assembly; the tail-end main rod having another helical shaft joint mechanism.

Claims

1. A helical joint mechanism for a surgical instrument, comprising: a rotating shaft having an external rotating thread formed on its outer surface, the external rotating thread providing a surgical instrument component for screwing onto the rotating shaft; a locking shaft connected to the rotating shaft, the locking shaft having a locking external thread formed on its outer surface; and a locking knob having an internal locking thread formed on its inner surface, the internal locking thread being screwable onto the locking external thread; wherein the diameter of the rotating shaft is smaller than the diameter of the locking shaft, and the rotation directions of the external rotating thread and the external locking thread are opposite; When the locking internal thread is engaged with the locking external thread, when the locking knob is loosened to the point where there is a gap between it and the surgical instrument component, the surgical instrument component can rotate along the rotating external thread to adjust the angle; when the locking knob is tightened along the locking external thread to the point where there is no gap between it and the surgical instrument component, the surgical instrument component is locked, and the angle of the surgical instrument component is fixed.

2. The helical shaft joint mechanism as described in claim 1, wherein, The rotating external thread and the locking external thread are double-threaded.

3. A spinal minimally invasive surgical retractor, comprising: a main rod assembly having a left main rod and a right main rod, serving as the main body of the spinal minimally invasive surgical retractor; the front end of the left main rod having a helical shaft joint mechanism as described in claim 1; the front end of the right main rod having another helical shaft joint mechanism; a cylindrical assembly rotatably connected to the main rod assembly, having a left cylinder and a right cylinder for retracting and maintaining the wound area; a retracting knob locked to a retracting screw hole on the side of the main rod assembly for simultaneously and symmetrically adjusting the retracting angle of the left cylinder and the right cylinder; a tail-end main rod screwed to a tail-end fixing member for engagement with the main rod assembly; the tail-end main rod having another helical shaft joint mechanism.

4. The spinal minimally invasive surgery spreader as described in claim 3, wherein, When the cylinder assembly is adjusted inward or outward, if the locking knob is loosened to the point where there is a gap between it and the cylinder assembly, the cylinder assembly can rotate along the external rotation thread to adjust the cylinder assembly's deflection angle; if the locking knob is tightened along the locking external thread to the point where there is no gap between it and the cylinder assembly, the cylinder assembly is locked, thus fixing the cylinder assembly's deflection angle.

5. The spinal minimally invasive surgery spreader as described in claim 3, wherein, When the tilt angle of the spinal minimally invasive surgery retractor is adjusted in the up and down direction, if the locking knob is loosened to the point where there is a gap between it and the tail end fixation member, the spinal minimally invasive surgery retractor can rotate along the external rotating thread to adjust the tilt angle; if the locking knob is tightened along the locking external thread to the point where there is no gap between it and the tail end fixation member, the spinal minimally invasive surgery retractor is locked, thus fixing the tilt angle of the spinal minimally invasive surgery retractor.

6. The spinal minimally invasive surgery spreader as described in claim 3, wherein, The spinal minimally invasive surgery spreader further includes a wrench; the wrench is detachably mounted to the locking knob for assisting in loosening or tightening the locking knob; the wrench is detachably mounted to the cylindrical assembly for assisting in rotating the cylindrical assembly.

7. The spinal minimally invasive surgery spreader as described in claim 3, wherein, The thickness of the main rod assembly is 8mm to 10mm.

8. The spinal minimally invasive surgery spreader as described in claim 3, wherein, The spinal minimally invasive surgery retractor further includes a three-section tube connecting piece, which is connected to the tail end main rod, for mounting the spinal minimally invasive surgery retractor on the operating table.

9. The spinal minimally invasive surgery spreader as described in claim 3, wherein, The tail ends of the left main rod and the right main rod have a toothed meshing structure, which locks the left main rod and the right main rod in place to maintain the symmetry of the opening angle when the opening angle of the left cylinder and the right cylinder is adjusted.

Images