Evaluation of Cleaning Methods for Device with Lumen Instruments

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  • HIRAOKA Yasuko
    Department of Infection Control and Prevention, Asahikawa Red Cross Hospital
  • ICHIKAWA Yukari
    Department of Infection Control and Prevention, Asahikawa Red Cross Hospital

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Other Title
  • 管腔器材を用いた各種洗浄法の判定
  • カンコウキザイ オ モチイタ カクシュ センジョウホウ ノ ハンテイ
  • Evaluation of cleaning methods for device with Luman instruments

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Abstract

  The increase in arthroscopic procedures requires effective intratubular washing of luminal divices to assure sterility of equipment. The present experimental study tested the washing efficiency of equipment parts. The experimental equipment parts consisted of Group I silicon tube (length 40 cm, diameter 4 mm) and Group II stainless steel tube (length 40 cm, diameter 2 mm) with wire (7 strands with diameter 0.7 mm)passed through the lumen of the tubes. Human blood was injected into each device, 1 cm3 for Group I and 0.5 cm3 for Group II, and allowed to stand for 19 hours and 40 minutes. The experimental parts (5 in Groups I and II) were then washed with five different methods A to E. Methods A and B were intended to determine remnant human blood by visual contact after soaking in 1% weak alkali cleanser enzyme systems and washing with a water-gun. Method A used an ultrasonic bath Washer-Disinfector after removing the wire from the lumen. Method B was similar but used a water stream in the Washer-Disinfector. Method C used a washing machine for tubes with vacuum, suction, and water ejection functions. Method D used the washing machine with only the suction function is for D. No preliminary washing or dissolution was used for Methods C and D. Tubes were washed with a condition of anchoring exposure. Method E also used soaking in weak alkali cleanser as for Methods A and B, after which the wire was removed from the lumen for hand washing. Wash appraisal method was based on using a chromatometer to determine the amount of remnant protein(μg). Remnant protein amounts for Groups I and II ware as follows: Method A, 141 μg and 154 μg, Method B, 1410 μg and 707 μg, Method C, 5 μg and 2 μg, Method D, 14 μg and 5 μg, Method E, 2426 μg and 129 μg, respectively. The highest amount of remnant protein was 2426 μg in the silicon tube washed by hand. Tube equipment parts containing human blood are best washed by Methods C and D.<br>

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