Test strip with slot vent opening
First Claim
1. A test strip, comprising:
- a base substrate having electrodes formed thereon;
a reagent layer overlying a portion of the base substrate;
a spacing layer overlying at least the reagent layer;
a chamber cover overlying a first portion of the spacing layer;
a body cover overlying a second portion of the spacing layer, the chamber cover and the body cover having a slot therebetween;
wherein the spacing layer has a void that defines a sample receiving chamber between the base substrate and the chamber cover, wherein the slot is in communication with the sample receiving chamber, the slot defining a vent opening between the chamber cover and the body cover that allows air to escape as fluid enters the sample receiving chamber; and
wherein the reagent layer is disposed in the sample receiving chamber and covering at least one of the electrodes and extends under the spacing layer and is sandwiched between the spacing layer and the base substrate.
7 Assignments
0 Petitions
Accused Products
Abstract
A test strip with a covering layer having a novel slot. The slot divides the inventive covering layer into two parts and provides a vent opening that allows air to escape as fluid enters a cavity or sample receiving chamber formed in the test strip. In preferred embodiments, the covering layer is clear such that the user can see through it and the slot doubles as a “fill line.” The user can thus watch the fluid sample enter the test strip, progress through the capillary cavity, and then stop at the slot or fill-line. This provides positive assurance to the user that the sample size is sufficient and the test strip has been filled properly. The present invention also provides an advantageous method of mass-producing the inventive test strips without having to align the slot or vent opening laterally with respect to the test strips and without having to punch a vent opening. The method is also well suited to mass production by roll processing techniques.
381 Citations
23 Claims
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1. A test strip, comprising:
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a base substrate having electrodes formed thereon; a reagent layer overlying a portion of the base substrate; a spacing layer overlying at least the reagent layer; a chamber cover overlying a first portion of the spacing layer; a body cover overlying a second portion of the spacing layer, the chamber cover and the body cover having a slot therebetween; wherein the spacing layer has a void that defines a sample receiving chamber between the base substrate and the chamber cover, wherein the slot is in communication with the sample receiving chamber, the slot defining a vent opening between the chamber cover and the body cover that allows air to escape as fluid enters the sample receiving chamber; and wherein the reagent layer is disposed in the sample receiving chamber and covering at least one of the electrodes and extends under the spacing layer and is sandwiched between the spacing layer and the base substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification