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Apparatus for monitoring respiratory performance

  • US 4,294,262 A
  • Filed: 05/30/1979
  • Issued: 10/13/1981
  • Est. Priority Date: 05/31/1978
  • Status: Expired due to Term
First Claim
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1. Respiratory performance monitoring apparatus comprising means forming a chamber having a wall formed by a non-magnetizable material and ports whereby respiratory gas flow to be monitored when the apparatus is being used is passed through said chamber, and a pneumatic-to-electric transducer adapted to actuate an electronic readout unit, the transducer including a rotor mounted rotatably within said chamber so as to be driven by respiratory gas flow through said chamber, at least one rare earth magnet mounted on said rotor, and a sensitive Hall effect sensor mounted outside the chamber on the opposite side of said wall in close proximity to the path of rotation of said at least one magnet within said chamber whereby an output indicative of rotation of the rotor can be derived from output signals emitted by said Hall effect sensor, the Hall effect sensor and the non-magnetizable material of said wall being able to withstand temperatures of the order to which the apparatus is subjected for sterilization purposes.

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