Method of preventing short sampling of a capillary or wicking fill device
First Claim
1. A method of manufacture of a device for sampling a fluid, the device comprising a pre-chamber having an interior surface and a first volume, the pre-chamber being capable of exerting a first capillary force, the device further comprising a sensing chamber in fluid communication with the pre-chamber, the sensing chamber having an interior surface and a second volume, the sensing chamber being capable of exerting a second capillary force, wherein the first volume is not less than the second volume, and wherein a differential exists between the capillary forces, the differential being sufficient to cause flow of fluid from the pre-chamber to substantially fill the sensing chamber, the method comprising the steps of:
- forming an aperture extending through a sheet of electrically resistive material, said aperture defining a side wall of the sensing chamber;
mounting a first thin layer to a first side of the sheet and extending over the aperture whereby to define a first sensing chamber end wall;
mounting a second layer to a second side of the sheet and extending over the aperture whereby to define a second sensing chamber end wall in substantial overlying registration with the first thin layer, whereby said sheet and layers form a strip;
removing a section of the strip which overlaps the sensing chamber and an edge of the strip whereby to define a notch;
mounting a first covering layer to a first side of the strip and extending over the notch whereby to define a first pre-chamber wall; and
mounting a second covering layer to a second side of the strip and extending over the notch whereby to define a second pre-chamber wall in substantial overlying registration with the first covering layer.
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Abstract
The current invention provides a device, and a method for using the device, for ensuring that a capillary or wicking fill device is fully filled. In particular this invention is directed to, but not limited to, use with capillary or wicking action filled electrochemical sensors suitable for use in analyzing blood or interstitial fluids.
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Citations
43 Claims
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1. A method of manufacture of a device for sampling a fluid, the device comprising a pre-chamber having an interior surface and a first volume, the pre-chamber being capable of exerting a first capillary force, the device further comprising a sensing chamber in fluid communication with the pre-chamber, the sensing chamber having an interior surface and a second volume, the sensing chamber being capable of exerting a second capillary force, wherein the first volume is not less than the second volume, and wherein a differential exists between the capillary forces, the differential being sufficient to cause flow of fluid from the pre-chamber to substantially fill the sensing chamber, the method comprising the steps of:
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forming an aperture extending through a sheet of electrically resistive material, said aperture defining a side wall of the sensing chamber;
mounting a first thin layer to a first side of the sheet and extending over the aperture whereby to define a first sensing chamber end wall;
mounting a second layer to a second side of the sheet and extending over the aperture whereby to define a second sensing chamber end wall in substantial overlying registration with the first thin layer, whereby said sheet and layers form a strip;
removing a section of the strip which overlaps the sensing chamber and an edge of the strip whereby to define a notch;
mounting a first covering layer to a first side of the strip and extending over the notch whereby to define a first pre-chamber wall; and
mounting a second covering layer to a second side of the strip and extending over the notch whereby to define a second pre-chamber wall in substantial overlying registration with the first covering layer. - 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, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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Specification