Element for analyzing body fluids
First Claim
1. A multi-layer analytical element comprising in this order, a light transmitting and water impermeable support, a first non-fibrous porous layer, a second non-fibrous porous layer, and a fibrous porous layer, the three porous layers being locally bonded together with an adhesive to allow for through-holes so as not to substantially interfere with uniform penetration of a liquid therethrough, at least one of the non-fibrous porous layers containing a reagent composition which undergoes a detectable optical change in the presence of a component to be analyzed, said optical change being detectable in the first non-fibrous porous layer, wherein said first non-fibrous porous layer comprises a polysulfone.
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Abstract
A multi-layer analytical element for analyzing body fluids includes a light transmitting and water impermeable support having provided thereon a fist non-fibrous porous layer, a second non-fibrous porous layer, and a fibrous porous layer in this order, the three porous layers being bonded together in one piece with an adhesive locally applied in such a manner that small through-holes are formed so as not to substantially interfere with uniform penetration of the liquid. At least one of the non-fibrous porous layers contains a reagent composition which undergoes a detectable optical change in the presence of a component to be analyzed, which optical change is detectable in the first non-fibrous porous layer, and wherein the non-fibrous porous layer comprises polysulfone. The analytical element enables dry analyses with improved precision independently of the hematocrit value of samples.
54 Citations
16 Claims
- 1. A multi-layer analytical element comprising in this order, a light transmitting and water impermeable support, a first non-fibrous porous layer, a second non-fibrous porous layer, and a fibrous porous layer, the three porous layers being locally bonded together with an adhesive to allow for through-holes so as not to substantially interfere with uniform penetration of a liquid therethrough, at least one of the non-fibrous porous layers containing a reagent composition which undergoes a detectable optical change in the presence of a component to be analyzed, said optical change being detectable in the first non-fibrous porous layer, wherein said first non-fibrous porous layer comprises a polysulfone.
- 7. A multi-layer analytical element comprising in this order, a light transmitting and water impermeable support, a water permeable layer, a first non-fibrous porous layer, a second non-fibrous porous layer, and a fibrous porous layer in this order, the three porous layers being bonded locally together with an adhesive to allow for through-holes so as not to substantially interfere with uniform penetration of a liquid therethrough, at least one of the water permeable layer and non-fibrous porous layers containing a reagent composition which undergoes a detectable optical change in the presence of a component to be analyzed, said optical change being detectable in the water permeable layer, wherein said first non-fibrous porous layer comprises polysulfone.
Specification