Endoscopy in clinic diagnose and cure of digestive disease is more and more broad,and the patients need that is more in limited medical source.In domestic,one endoscopy is repeated used .Because the endoscopy touches with patients’ body liquid,blood and organism,it could cause crossing infected without any rigid disinfect.the high-effective,rapid and safe disinfect for endoscopy becomes focus,and the electrolyzed water disinfect method reveals to become the new disinfect in domestic and abroad.

The actual disinfect for endoscopy

The effective disinfect of endoscopy is more and more important with the development of cure and inspect of endoscopy.According to the (disinfect rule in hospital)issued by Chinese health ministry,endoscopy is belonged with the disinfected endoscopy,and need to be disinfected to kill all bacteria before using including bacterial generation,virus and fungal and so on.US digestive endoscopy association has the statistic that most patient inspected by endoscopy in 1998,the infectious people is over 80%.Here is the focus for medical circle,patients and public agent that the HIV and helicobacter pylori hepatitis B virus is diffused by endoscopy.The papers about the endoscopy disinfect by association shows that the standard cleaning course is killing out the normal bacterial on endoscopy except mycobacterium tuberculosis,bacillus and virus.Here is the shortage of recovery of crossing infection by endoscopy .The not rigid disinfect for endoscopy need to be esteemed by clinic and medical staffs.

In domestic,most units take chemical detergent to disinfect,which is admitted by international to be attention with the concentration and disinfect time by glutaraldehyde 2% and disinfectant with chlorine by which the patients disinfect need 20-45 minutes and more water to clean with high cost.It cause drug-resistant to impact the disinfect effect due to the not rigid disinfect rule and low-effective detergent.The chemical detergent has certain side-effect and irritation for skin and harm the endoscopy and accessories.The waste could cause the pollution.

2. Oxidizing potential water and disinfect of endoscopy

2.1 concept and generation

Oxidizing potential water (EOW)possesses high ORP,low PH value and low concentration active chlorine,active oxygen and HCLO.It has strong effect of killing microbe.The 0.05% NACL solution by taking 5g NACL into water through the electrolysis cell with cation exchange membrane becomes acidic electrolyzed water in the platinum titanium alloy electrode.The electrolyzed water in positive pole possesses PH value 2.5±0.2 and ORP 1120±70mv to generate antibacterial including CL2,HOCL,HCL and 5±2free residual chlorine and so on.

2.2 killing bacterial mechanism

At present,the living value of bacterial and virus is PH value4-9 and ORP -400-900.Except that value,the bacterial is difficult to live and generate.The PH value and ORP in acidic water destroys the pathogen living atmosphere to change the potential difference inside cell leading to die because of adding permeability to destroy metabolism enzyme.Free potential chlorine and HCLO enhance the disinfect of acidic water.