Patent ID: 7285246

Claim:
A disposable device for detecting the presence of a substance in a test fluid, comprising: a flexible and resilient first housing of generally cylindrical shape; an ampoule positioned within a lumen of said first housing; said ampoule adapted to sealably retain an indicator reagent; said ampoule adapted to be ruptured when subjected to a manually applied, radially inwardly directed force applied to said first housing; said ampoule having an outer diameter substantially less than a diameter of said lumen; a first filter positioned within a lumen of said first housing in abutting relation to a first end of said ampoule; a second filter positioned within a lumen of said first housing in abutting relation to a second end of said ampoule; said first and second filters being snugly received within said lumen of said first housing; said ampoule having rounded opposite ends; a first concavity formed in an inboard end of said first filter; a second concavity formed in an inboard end of said second filter; said first concavity being complementary in size and shape to a convex first rounded end of said ampoule; said second concavity being complementary in size and shape to a convex second rounded end of said ampoule; whereby said indicator reagent undergoes a visually detectible change in the presence of a predetermined amount of said substance; whereby said first and second concavities hold said ampoule in substantially coincident relation to a longitudinal axis of symmetry of said first housing.