Title:
【発明の名称】呼吸用マスクのフイットテストを行う非侵入性定量方法並びにそれに関連した呼吸マスク装置
Document Type and Number:
Japanese Patent JPS63502007
Kind Code:
A
Abstract:
A method and apparatus for conducting the method for non-invasive, quantitative respirator fit testing. The method includes the steps of having the wearer properly position the respirator over his nose and mouth, inhale to create a negative pressure inside the respirator cavity volume, hold his breath and record the pressure differential versus time decay rate between the pressure inside the respirator cavity volume and that of the surrounding environment. The method may also include establishing a leakhole of known dimension, repeating the above steps and determining the volume of the respirator cavity based upon the results of the recorded differential pressure versus time by comparing the result to calibration curves. The apparatus of the present invention includes modifying a conventional face mask respirator by providing the respirator with a pressure sensor and a leakhole of known dimension. Preferably, the apparatus can also include a calculator to continuously calculate a quantitative factor to indicate the degree of protection, which is based upon the volume of the respirator cavity divided by the volumetric flow rate through the leakhole or holds of unknown dimension and location for a standard unit of time, given an initial negative pressure in the respirator cavity.
Inventors:
Willeke, Claus
Application Number:
JP50617186A
Publication Date:
August 11, 1988
Filing Date:
November 11, 1986
Export Citation:
Assignee:
University-City-of Cincinnati
International Classes:
A62B18/02; A62B27/00; (IPC1-7): A62B18/02; A62B27/00
Domestic Patent References:
| JP57079739B |
Attorney, Agent or Firm:
Kazuo Sato