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 capillary channel to permit the sample to flow from the first end to the second end,c) the capillary channel comprising(i) a dry reagent on the conductive surface of one of the first and second 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 first and second layers having a first insulating pattern scored into its conductive surface to divide the conductive surface into two regions, insulated from each other, wherein the first insulating pattern has at least one serration with the capillary channel, whereby sample that flows across the first insulating pattern provides a conductive path from the first end to the second end.
7 Assignments
0 Petitions
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.
141 Citations
12 Claims
-
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 capillary channel to permit the sample to flow from the first end to the second end, c) the capillary channel comprising (i) a dry reagent on the conductive surface of one of the first and second 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 first and second layers having a first insulating pattern scored into its conductive surface to divide the conductive surface into two regions, insulated from each other, wherein the first insulating pattern has at least one serration with the capillary channel, whereby sample that flows across the first insulating pattern provides a conductive path from the first end to the second end.
Specification