×

Dosimetric spacer for calculating dosage administered

  • US 5,842,468 A
  • Filed: 07/14/1997
  • Issued: 12/01/1998
  • Est. Priority Date: 10/27/1994
  • Status: Expired due to Term
First Claim
Patent Images

1. Apparatus for administering a fluid medicament to a patient in a gas for inhalation and for calculating the dosage administered to the patient comprisinga holding chamber for temporarily holding the medicament and gas prior to inhalation;

  • means for introducing a quantity of the medicament into the holding chamber;

    a sensor for sensing the introduction of the medicament into the holding chamber;

    detector means for detecting the rate of flow of gas inhaled by a patient from the holding chamber; and

    calculation means operably connected to the sensor and to the detector means for calculating the amount of medicament received by a patient on the basis of;

    the preset quantity of medicament released into the holding chamber;

    of the preset volume of the holding chamber;

    the time elapsed from the sensing of the introduction of the medicament;

    and of the detected rate of flow of gas inhaled from the holding chamber;

    the calculation being made by assessing the concentration of the medicament in the holding chamber on a time basis during reduction of the said concentration within the holding chamber due at least in part to deposition of the medicament within the holding chamber, and by determining the volume of the gas received by the patient during inhalation, and the time elapsed from the sensed introduction of medicament to the inhalation by the patient.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×