Cryotherapy in Opthalmology Cryo Cautery Machine Cryotherapy Machine
1. Working Principle Based on the Joule-Thomson principle, the cryotherapy apparatus usesliquid carbon dioxide or liquid nitrous oxide as therefrigerant for freezing or thawing. In the freezing process, the cycling system of the apparatus conducts the high-pressure refrigerantto the cryoprobeand release it at the tip of thecryoprobe. In the thawing process, the apparatus closes control valve of vent-pipe first and then conduct the high-pressure carbon dioxide to the venting system. With the rising of the gas pressure in the cryoprobe, the temperature risesto room temperature. The operator can use the pedal to switch between the freezing and thawing processes
2. Performance, structure and composition The cryotherapy apparatus comprises the main cabinet, cryoprobe, pressure relief valve and control pedal. 1) Normal working pressure: 5.0MPa - 5.5MPa 2) Time display error: ± 5s/min 3) Cryoprobe temperature:
≤-70ºC(Refrigerant: CO2)
≤-80ºC(Refrigerant: N2O)
4) Freezing and thawing process duration: ≤6s 5) Pressure releasing duration: 90s 6) Rated voltage and frequency used: 220v/110v±10%, 50Hz/60Hz±2% 7) Instrument input power: <10VA 8) Fuse specification: F1AL250V 9) Accuracy of pressure gauges: 2.5
3. Scope of application It is applicable for cryosurgery for ophthalmic diseases on the retina or in the ciliary body.
4. Safety Parameters and Technical Parameters (in Chinese Standard) 1) ProtectionClass: Class I 2) Protection Type: Type B (non AP/PG) 3) Water Ingress Protection: IPX1 4) Operation Mode: Intermittent 5) Not comprise the component for the protection against defibrillation discharge effect 6) The apparatus does not comprise the IO for signal 7) Movability: movable 8) Type of the low temperature thermometer: analog 9) Type of thermocouple: Type T 10) Range of thermometer: 0ºC-85ºC 11) Electromagnetic compatibility: comply with the requirements of electromagnetic compatibility for medical device
5. Operating conditions 1) Working temperature: 20-30ºC 2) Relative humidity: ≤85% 3) Air pressure: 500-1060hPa 4) Power: 220v/110vAC 50Hz/60Hz 5) Refrigerant purity:>99.5% (N2O/CO2) 6) Gas pressure: 5-6.0MPa
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