High-power holmium laser is currently the most effective and common equipment for intracavitary lithotripsy through the natural cavity of the urethra and the percutaneous renal channel (especially the natural cavity for lithotripsy). Liquid perfusion is necessary and very important for holmium laser lithotripsy Conditions, there are several key points worthy of attention and attention:

1. The liquid circulating in the cavity at high speed can eliminate the haze phenomenon during stone crushing, and ensure the continuous clearness of the endoscope, and the holmium laser can continue to efficiently and safely crush stone, just like a high-powered BMW car on a closed highway. The high power and safe driving can only be exerted in the fog and fine weather.

2. The effective circulation of liquid must be at the front end of the endoscope objective lens, that is, the working area of ​​the holmium laser fiber tip, in order to effectively ensure the clarity of the endoscope (like the irradiation area of ​​a car headlight) and quickly and effectively eliminate the holmium laser working area Therefore, the liquid access must be jetted from the front end of the endoscope to be the most reasonable.

3. The outer diameter of the endoscope must match the inner diameter of the selected sheath. The so-called match is the effective perfusion flow of the endoscope, which must be greater than the minimum flow of heat generated by the holmium laser lithotripsy (continuous perfusion 40ml/min).

4. Control the liquid pressure in the cavity within a safe range, the safe range is less than 30mmHg (infection less than 15mmHg), the liquid pressure setting and operation through the front part of the lens body cannot meet the above-mentioned precise pressure control requirements, because it is determined that the intracavity pressure is perfusion Flow instead of perfusion pressure!

5. The sheath space is a key indicator that determines the perfusion flow and intraluminal pressure. The application of instruments directly detects the intraluminal pressure and can detect the maximum liquid output that the sheath space can carry.

6. Active attraction is an effective means to reduce the pressure of the liquid in the cavity.

VII. Liquid pressure cannot be accurately judged by the naked eye. Pressure can only be accurately expressed through data.

8. Intelligent suction can accurately control the pressure of the liquid in the cavity. Under continuous liquid perfusion, the pressure is maintained within the set safety range, and when the warning value and limit value are reached, there is an alarm and automatic shutdown protection device.