Test strip for determining concentration of multiple...

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Details

G01N 33/92 (2006.01) C12Q 1/44 (2006.01) G01N 33/52 (2006.01) G01N 33/543 (2006.01)

Patent

CA 2471726

A multilayer test strip [20] that measures concentrations of multiple analytes from a single whole blood sample [58]. The test strip [201 includes a test matrix [36] of several layers held together in constant contact by a test strip holder [22]. The invention is characterized in that it has no moving parts, which is made possible by the novel use of an elongate disbursement layer [38] that spreads blood throughout its entire length, despite having layers [40, 110] with known wicking properties adjacent to and in contact with it [38]. Since the invention relies primarily on a vertical flow format, the test strip [20] is advantageously quite compact. With a single 35 microliter sample [58] of blood applied thereto, the novel test strip [20] can provide readings of total cholesterol, HDL cholesterol and triglycerides. From these, LDL can be calculated, thereby providing a full "lipid panel." Other analytes such as glucose and ketoses may be included in the test strip [20] in addition to or in lieu of one or more of the other analytes.

L'invention concerne un bâtonnet diagnostique multicouches (20) mesurant des concentrations de plusieurs analytes à partir d'un échantillon sanguin complet unique (58). Ce bâtonnet diagnostique (20) comprend une matrice de diagnostic (36) constituée de plusieurs couches maintenues ensemble en contact constant par le biais d'un support de bâtonnet diagnostique (22). L'invention est caractérisée en ce qu'elle ne comporte aucune partie mobile, ce qui est rendu possible par la nouvelle utilisation d'une couche d'étalement allongée (38) permettant d'étaler le sang sur toute la longueur du bâtonnet, bien que le bâtonnet comporte des couches (40, 110) présentant des propriétés d'absorption capillaire connues, adjacentes à la couche (38) et en contact avec la couche (38). Puisque l'invention repose essentiellement sur un format d'écoulement vertical, le bâtonnet diagnostique (20) est assez avantageusement compact. Lorsqu'on applique sur le bâtonnet un échantillon de sang unique (58) de 35 microlitres, le nouveau bâtonnet diagnostique (20) permet d'obtenir des lectures de cholestérol total, de cholestérol HDL et de triglycérides. A partir de ces lectures, LDL peut être calculé, ce qui permet d'obtenir "un bilan lipidique" total. D'autres analytes tels que le glucose et les cétones peuvent être compris dans le bâtonnet diagnostique (20) en plus d'un ou de plusieurs autres analytes, ou au lieu d'un ou de plusieurs autres analytes.

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