章 618: Was Really Aggrieved

The top of the coronary artery plaque rotary grinding catheter was a metallic stainless steel drill head embedded with fine diamond particles. The catheter entered the blockage position of the coronary artery and Zheng Ren opened the drill head.

The drill head was welded to a long and soft spiral rotating catheter, driven by a gas turbine connected to it to rotate at a high speed of 180,000 to 200,000 rpm.

When the drill head rotated at high speed, it could grind the plaque into small debris and wash it to the far end. The debris could then pass through the capillary bed.

There was a cavity in the catheter to pass through a 300cm long guide wire as thin as 0.25cm.

The driving shaft was installed in the 4.3 F polyethylene sheath pipe. During operation, the sheath pipe was pressurized by 40 KPA and continuously washed with normal saline to cool and lubricate it.