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Development of Surgical Instrument Decontamination Unit (A88-184) SBIR 88.II. Phase 2.

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Final rept. 2 Apr 90-1 May 92,

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The design and operation of a unit for the decontamination of surgical instruments is described and test results reported. The unit is based in part on an amplification of the biocidal action of hydrogen peroxide using ultrasound to facilitate rapid sterilization of microbial spores, vegetative cells, and viruses. A prototype unit based on experience factors arising from earlier test data was utilized to establish system design and proposed operational procedures and parameters. It includes a spray rinse compartment, a temperature-controlled ultrasonic prewash compartment filled with 500 ppm quaternary ammonium solution, and a temperature-controlled ultrasonic sterilization compartment filled with 5 wt H 20 2 solution. Performance is improved by a combination of 80 KHz ultrasound generated simultaneously from each tank bottom and one side. Instruments are suspended on a movable rack for progressive rinsing, cleaning, and sterilization. Tests on a representative set of surgical instruments heavily contaminated with undiluted equine blood containing 10 - 10 spores per ml of Bacillus subtilis demonstrated that the efficiency of sterilization depends in large part on the design and configuration of the specific surgical instrument. Instruments with no hinge, sliding mechanisms, or tight-fitting internal control rods are readily decontaminated using wash and sterilize times of under 5 minutes. Simple hinged instruments such as towel clamps require up to 10 minutes in each of the wash and sterilize tanks. Scissors and rongeurs require 15 minutes in each tank. Surgical Instruments Ultrasonic Cleaning Clean Sterilizer Decontaminate Hydrogen Peroxide SBIR Phase II RA II.

Subject Categories:

  • Medical Facilities, Equipment and Supplies

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