Abstract
The aim of the present study was to evaluate the potential hazards of multiple use of disposable syringes and needles for insulin injections over a long period of time. A special syringe container (pen-case) was developed to carry the syringe with insulin. In the microbial trial 24 patients, each injecting insulin for 1 week with one disposable needle, were studied for 201 patient-weeks with 5829 injections. Cultures of 154 needles, 155 syringe rinses, 154 pen-case rinses and the remains of insulin in 201 vials revealed no relevant contamination. In the clinical trial 100 diabetic patients were followed up for up to 7 years. Each syringe was reused for 1 to 12 weeks and each needle for 1 to 40 days (4 to 200 injections). Only sporadic redness not exceeding 4 mm2 was seen at sites of about 560,000 insulin injections. Thus, the repeated use of syringes and needles in one diabetic patient may be recommended as a convenient and safe approach in insulin administration.
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