Ultrasonic decontamination device

• US 10,517,977 B2
• Filed: 07/10/2015
• Issued: 12/31/2019
• Est. Priority Date: 07/18/2014
• Status: Active Grant

• Current Assignee: Nitta Corporation
• Original Assignee: Nitta Corporation
• Inventors: Sakaki, Akio
• Primary Examiner(s): Joyner, Kevin
• Assistant Examiner(s): Mull, Holly M
• Application Number:
  US14/796,433
• Publication Number:
  US 20160022852A1
• Time in Patent Office: 1,635 Days
• Field of Search: 422 28
• CPC Class Codes: A61L 2/20 Gaseous substances, e.g. vapours
• CPC Class Codes: A61L 2/208 Hydrogen peroxide
• CPC Class Codes: A61L 2/22 Phase substances, e.g. smokes, aerosols or sprayed or atomised substances
• CPC Class Codes: A61L 2/24 Apparatus using programmed or automatic operation
• CPC Class Codes: A61L 2202/13 Biocide decomposition means, e.g. catalysts, sorbents
• CPC Class Codes: A61L 2202/14 Means for controlling sterilisation processes, data processing, presentation and storage means, e.g. sensors, controllers, programs
• CPC Class Codes: A61L 2202/25 Rooms in buildings, passenger compartments
• CPC Class Codes: A61L 2209/111 Sensor means, e.g. motion, brightness, scent, contaminant sensors
• CPC Class Codes: A61L 2209/132 Piezo or ultrasonic elements for dispensing
• CPC Class Codes: A61L 2209/135 Vaporisers for active components
• CPC Class Codes: A61L 2209/211 Use of hydrogen peroxide, liquid and vaporous
• CPC Class Codes: A61L 9/122 comprising a fan
• CPC Class Codes: A61L 9/14 using sprayed or atomised substances including air-liquid contact processes

Abstract

A device and method for decontaminating the interior of a biosafety cabinet using a drug considered to be safe for humans is provided. A device for decontaminating the interior of a biosafety cabinet includes an ultrasonic atomizer for atomizing a peracetic acid disinfectant using ultrasound and releasing droplets; a diffusion fan; a circulation fan; a temperature-humidity sensor; and a controller.

Claims

1. A method for decontaminating the interior of a biosafety cabinet, the method comprising:

providing an exhaust HEPA filter in the interior of the biosafety cabinet;

providing an interior duct within the interior of the biosafety cabinet;

installing an ultrasonic atomizer, having a nozzle, for atomizing a peracetic acid disinfectant by ultrasonic vibration and releasing droplets, a diffusion fan, a temperature-humidity sensor, and a circulation fan in a work area of the biosafety cabinet, the diffusion fan being connected to the ultrasonic atomizer, wherein the diffusion fan is installed at a periphery of the nozzle of the ultrasonic atomizer;

releasing droplets by activating the ultrasonic atomizer and atomizing the peracetic acid disinfectant by ultrasound, and gasifying the droplets; and

circulating the gasified peracetic acid in the interior of the biosafety cabinet,

providing the work area with a return inlet configured to return the circulated gasified peracetic acid into the work area and an outlet configured to convey the circulated gasified peracetic acid from the work area,

wherein an impending flow of the peracetic acid gas at an exit of the interior duct is partially returned to the work area through the return inlet while at least a portion of the impending flow of the peracetic acid gas is exhausted to the outside via only the exhaust HEPA filter without being recirculated through the work area and at a position that is proximate the return inlet.

2. The method according to claim 1, wherein the peracetic acid gas is circulated in the interior of the bio safety cabinet by the circulation fan.

3. The method according to claim 2, wherein the peracetic acid gas is circulated in the interior of the biosafety cabinet and partially exhausted to the exterior by operating the circulation fan and creating circulation of air leading from the work area into the interior duct, to a circulation HEPA filter, and back to the work area, and exhausting some of the air through an exhaust HEPA filter to the exterior.

4. The method according to claim 1, wherein gasification of the droplets of the peracetic acid disinfectant is promoted by the diffusion fan.

5. The method according to claim 1, wherein the humidity in the work area is controlled at 85 to 90%.

6. The method according to claim 1, further comprising installing the diffusion fan within 10 cm of the nozzle.