Electrically-conductive patterns for monitoring the filling of medical devices
First Claim
1. A medical diagnostic device for measuring an analyte concentration of an electrically conductive biological fluid, comprising a multilayer structure having a first layer and a second layer sandwiching an intermediate layer, a) the first and second layers each comprising an insulating sheet, having a conductive surface adjoining the intermediate layer, b) the intermediate layer being an insulating layer with a cutout, having a first end and a second end, which, together with the first and second layers, defines a flow channel to permit the sample to flow from the first end to the second end, c) the flow channel comprising (i) a dry reagent on the conductive surface of one of the layers for reacting with the sample to yield a change in an electrical parameter that can be related to the analyte concentration of the fluid and (ii) an electrochemical cell, within which the electrical parameter is measured, d) the conductive surface of one of the layers having a first insulating pattern scored into its conductive surface to divide the second layer into two regions, insulated from each other, whereby sample that flows across the pattern provides a conductive path from the first end to the second end.
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Accused Products
Abstract
A flexible diagnostic device has a measurement cell that is sandwiched between the conductive surfaces of two conductive-coated insulating layers. At least one of the conductive surfaces is scored with an insulating pattern, so that the flow of a conductive fluid sample into the cell can be monitored.
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Citations
16 Claims
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1. A medical diagnostic device for measuring an analyte concentration of an electrically conductive biological fluid, comprising a multilayer structure having a first layer and a second layer sandwiching an intermediate layer,
a) the first and second layers each comprising an insulating sheet, having a conductive surface adjoining the intermediate layer, b) the intermediate layer being an insulating layer with a cutout, having a first end and a second end, which, together with the first and second layers, defines a flow channel to permit the sample to flow from the first end to the second end, c) the flow channel comprising (i) a dry reagent on the conductive surface of one of the layers for reacting with the sample to yield a change in an electrical parameter that can be related to the analyte concentration of the fluid and (ii) an electrochemical cell, within which the electrical parameter is measured, d) the conductive surface of one of the layers having a first insulating pattern scored into its conductive surface to divide the second layer into two regions, insulated from each other, whereby sample that flows across the pattern provides a conductive path from the first end to the second end.
- 14. A method for preparing an electrically conductive pattern comprising passing a web of a conductive-coated flexible insulator between a cutting die and anvil, in which the cutting die has a cutting element that is raised a height greater than the thickness of the conductive coating for scoring through preselected portions of the conductive coating.
Specification