Test sensor with multiple sampling routes
First Claim
1. An electrochemical test sensor comprising:
- a base layer having a sampling end and an electric contact end;
a middle layer having a width approximately equal to a width of the base layer, and having a sampling end and an electric contact end, the middle layer disposed above the base layer, the middle layer forming a cutout region;
an upper layer having a sampling end and an electric contact end, the upper layer being disposed above the middle layer;
a fluid chamber defined by the recessed edge of the middle layer defining the cutout region;
wherein the base layer further defines a recessed notch along its height on the sampling end, the recessed notch creating a bottom opening, the notch and bottom opening providing a fluid communication with the fluid chamber from a front edge and a bottom surface of the electrochemical test sensor, the recessed notch sized and configured to provide the fluid communication via capillary action; and
wherein the sampling end of the middle layer is recessed from a front edge of the sampling end of the upper layer and recessed from a front edge of the base layer sampling end, wherein the upper layer, middle layer, and base layer define two side openings in communication with the fluid chamber;
the fluid chamber having a sampling entrance defined by an open front opposite to the recessed edge of the middle layer, and by the recessed notch of the base layer, and by the two side openings, wherein a combined length of the open front and the two side openings of the fluid chamber is not greater than a perimeter length of the middle layer front edge.
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Accused Products
Abstract
An improved disposable electrochemical test sensor designed to facilitate sampling of fluid samples. It has a fluid chamber having a novel extra wide sampling entrance. The chamber provides a reservoir from which a sample fluid can be drawn into the chamber through capillary action. The novel extra wide sampling entrance of the test sensor provided by the present invention can draw blood into the chamber not only from the front of the sampling entrance as usual in convenient sensors, but also from the top, bottom, left corner and right corner of the sampling entrance. Thus it allows easy targeting the samples with small volume, picking up smeared samples and it is more tolerant to users who jam the tip of the sensor into users'"'"' finger.
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Citations
20 Claims
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1. An electrochemical test sensor comprising:
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a base layer having a sampling end and an electric contact end; a middle layer having a width approximately equal to a width of the base layer, and having a sampling end and an electric contact end, the middle layer disposed above the base layer, the middle layer forming a cutout region; an upper layer having a sampling end and an electric contact end, the upper layer being disposed above the middle layer; a fluid chamber defined by the recessed edge of the middle layer defining the cutout region; wherein the base layer further defines a recessed notch along its height on the sampling end, the recessed notch creating a bottom opening, the notch and bottom opening providing a fluid communication with the fluid chamber from a front edge and a bottom surface of the electrochemical test sensor, the recessed notch sized and configured to provide the fluid communication via capillary action; and wherein the sampling end of the middle layer is recessed from a front edge of the sampling end of the upper layer and recessed from a front edge of the base layer sampling end, wherein the upper layer, middle layer, and base layer define two side openings in communication with the fluid chamber; the fluid chamber having a sampling entrance defined by an open front opposite to the recessed edge of the middle layer, and by the recessed notch of the base layer, and by the two side openings, wherein a combined length of the open front and the two side openings of the fluid chamber is not greater than a perimeter length of the middle layer front edge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An electrochemical test sensor comprising:
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a base layer having a sampling end and an electric contact end, the base layer having electrodes at the sampling end, and electric contacts at the electric contact end, the electrodes being in communication with the electric contacts; a middle layer formed of an electrically insulating material having a width approximately equal to a width of the base layer, and having a sampling end and an electric contact end, the middle layer being disposed above the base layer, the middle layer forming a cutout region defined by at least a portion of a front edge being recessed from the sampling end of the middle layer along the width of the middle layer; an upper layer having a sampling end and an electric contact end, the upper layer being disposed above the middle layer; a fluid chamber defined on a top by the upper layer, on a bottom by the base layer, on a side by the recessed edge of the middle layer defining the cutout region, and having a sampling entrance defined by an open front opposite to the recessed edge of the middle layer, the fluid chamber sized and configured to receive a fluid by capillary action, and sized and configured to expose the electrodes of the base layer to the fluid; wherein the base layer further defines a recessed notch along its height on the sampling end, the recessed notch creating a bottom opening at a front bottom edge of the test sensor, the notch and bottom opening providing a fluid communication with the fluid chamber from a front edge and a bottom surface of the electrochemical test sensor, the recessed notch sized and configured to provide the fluid communication via capillary action, and positioned below an area defined by the fluid chamber so as to directly communicate with the fluid chamber, wherein the bottom opening is configured to allow a fluid to enter the fluid chamber against a force of gravity when the bottom surface of the electrochemical test sensor is parallel to a surface that the fluid is on, the upper layer disposed above the recessed notch such that the sampling end of the upper layer is not aligned with the sampling end of the base layer; and wherein the sampling end of the middle layer is recessed from a front edge of the sampling end of the upper layer and recessed from a front edge of the base layer sampling end, wherein the upper layer, middle layer, and base layer define two side openings in communication with the fluid chamber, the two side openings being defined by the sampling end of the middle layer being recessed from the front edge of the upper layer and base layer sampling ends, wherein a combined length of the open front and the two side openings of the fluid chamber is not greater than a perimeter length of the middle layer front edge. - View Dependent Claims (15, 16, 17, 20)
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18. An electrochemical test sensor comprising:
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a base layer having a sampling end and an electric contact end; a middle layer having a width approximately equal to a width of the base layer, and having a sampling end and an electric contact end, the middle layer disposed above the base layer, the middle layer forming a cutout region; an upper layer having a sampling end and an electric contact end, the upper layer being disposed above the middle layer; a fluid chamber defined by a recessed edge of the middle layer defining the cutout region; wherein the sampling end of the middle layer is recessed from a front edge of the sampling end of the upper layer and recessed from a front edge of the base layer sampling end, wherein the upper layer, middle layer, and base layer define two side openings in communication with the fluid chamber; wherein the sampling end of the upper layer is recessed from the sampling end of the base layer; and the fluid chamber having a sampling entrance defined by an open front opposite to the recessed edge of the middle layer, and by the two side openings, wherein a combined length of the open front and the two side openings of the fluid chamber is less than a perimeter length of the middle layer front edge. - View Dependent Claims (19)
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Specification