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The analysis of silicone foley catheter and latex urinary catheter to prevent urinary tract infection

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Author : Joe Wong
Update time : 2021-11-30 11:24:30
The analysis of silicone foley catheter and latex urinary catheter to prevent urinary tract infection

Urinary tract infection is a common clinical infectious disease. It is reported that nosocomial urinary tract infection accounts for 35%-50% of nosocomial infections, ranking first among nosocomial infections. Urinary tract infections reported in China accounted for the second highest number of nosocomial infections, at 35%, second only to respiratory tract infections at 42%. Among those with urinary tract infections, the rate of developing Xianheng sepsis is as high as 2%-4%, and the mortality rate is as high as 12%. Urinary tract infections caused by indwelling urinary catheters account for a large proportion of nosocomial infections. Studies have reported that the bacterial infection rate of patients with indwelling catheters is 13% within 72 hours, and the infection rate reaches 90% after 15 days. Therefore, it is very important to prevent urinary tract infections caused by indwelling catheters. The different materials have a great influence on the infection rate of urinary infections. At present, latex foley catheters and silicone foley catheters are the most commonly used clinically. We have conducted research and analysis on the secondary urinary tract infection rate of these two types of foley catheters indwelling in the human body. The details are as follows.

1. Investigation objects: The investigated cases are bone, spine and neurosurgery patients with indwelling catheters and no urinary system diseases from January 2015 to May 2017. The urobacterial test was negative at the time of admission. There were 310 cases in total. There were 170 males and 140 females. The age range from 25 to 70 years. The average catheter-indwelling time was 10 days. The patients were randomly divided into two groups, 180 cases in the experimental group, using silicone foley catheters; 130 cases in the control group, using latex foley catheters
2. Experimental method: a. Conventional catheterization method, double-lumen catheter (Fr14-Fr20) is used, the patient is in a supine position, and the patient is required to bend the hips and knees, separate the legs, expose the vulva, and disinfect the vulva according to the procedure. Bacteria operation, instruct the patient to breathe deeply, slowly insert the urine tube, 5-6cm deep after seeing the urine, and then inject normal saline into the airbag, connect the urine bag, and end the operation. b. Urine examination, according to aseptic operation, draw 10ml of urine, and immediately send the urine for bacterial culture. The time was the 3rd day, the 7th day and the 10th day after indwelling. Patients with indwelling catheters use 0.5% iodophor cotton balls to disinfect the urine mouth and surrounding skin every day, the urine bag is changed every two weeks, and the urinary catheter is changed once a week.
3. Judgment criteria: According to the "Diagnostic Criteria of Urinary System Etiology in the Diagnostic Standards for Hospital Infections" of the Ministry of Health, the number of gram-positive cocci colonies in urine culture is ≥104 cfu/ml, and the number of gram-negative bacilli colonies ≥105 cfu/ml.
Conclusion: The study showed that there was no statistically significant difference in the incidence of infection between the experimental group and the control group within 7 days of indwelling patients; when the indwelling time exceeded 7 days, the experimental group was significantly lower than the control group. From the characteristics of the material itself, the additives added to the latex catheter transfer from the inside to the surface, and stimulate the urethra to produce white secretion deposits, and the patient has an inflammatory reaction. Compared with silicone catheters, latex foley catheters are made of materials with poor histocompatibility, it is easy to be regarded as a foreign body in the body, which activates the immune system. White blood cells, lymphocytes and phagocytes will accumulate around the latex foley catheter, resulting in varying degrees of inflammatory reactions and promoting the formation of bacterial biofilms. Silicone foley catheters have good biocompatibility, and human tissues have very little response to them, and are not easy to cause foreign body reactions in the body. Therefore, the tissues around the foley catheters do not produce inflammatory reactions. Therefore, silicone as the material of the urinary catheter can reduce the irritation to the urethral mucosa, delay the formation of bacterial biofilm, and ultimately reduce the rate of urinary infection.