DISPOSABLE HYGIENIC DEVICE FOR CLEANING AND DRYING REACTIVE DIAGNOSTIC STRIPS

Abstract: A disposable hygienic support for cleaning and drying reactive dia­ gnostic strips, these strips exhibiting a reacting surface portion in contact with which a fraction of biological material to be ana­ lysed is placed. The support comprises a substantially rigid cove­ ring (1) and an element of absorbent material (3) fixed therein.The element is accessible from at least two opposite ends of the cover­ ing to permit the insertion of the strip, in such a manner that its reactive portion is on the outside, and the removal of the latter by passing the absorbent element through after a predetermined time of reaction between the reactive portion and the biological liquid. The invention provides a very useful article for handling diagnostic strips in safety conditions.

Description: The present invention relates to a disposable hygienic device for cleaning and drying reactive diagnostic strips which are commonly used, not only in medical analysis laboratories, but also in hospital departments, in medical out-patients departments and also in the patient's home. As is known, such strips are supports of synthetic material, at one end of which a surface is fixed, referred to as the reactive surface, on which the chemical system on which the reaction is based has been absorbed or adsorbed. At the moment of use, such surface is bathed, by immersion or by dripping, with the biological material to be examined (blood, urine, serum, plasma etc). Such material remains on the reactive surface for the time determined by the method, after which it is removed, drying the strip with absorbent material, or dripping or washing with water, depending upon the type of reaction which takes place on the strip. Subsequently the reaction proceeds, generally developing a colour on the said reactive surface in proportion to the concentration of the substance to be assayed. Some of the instances of use of these reactive strips involve the risk that extraneous persons (particularly the operator) and the environment (particularly the surfaces on which the tests are undertaken) will become contaminated with the biological material to be examined, thus involving the danger of infection and contamination. There has thus been constantly increasing awareness of the need to provide protection systems which are simple to use and involve low cost, which permit the avoidance, or at least the greatest possible limitation, of the risks of infection and contamination, this need being emphasized, above all, following the deepening of awareness concerning the diffusion routes of particularly serious diseases, such as viral hepatitis and Aids. The object of the present invention is therefore to provide an adequate protection, both for environments and for operators, whether in the health sector or not, from the risk of contamination with biological material during certain phases of implementation of the tests using the reactive strips. This object is achieved with a disposable device for cleaning and drying a reactive surface (R) at one end of a diagnostic strip (S) of an excess of biological material to be analyzed placed on said surface, characterized in that it comprises a rigid chamber with a depressible wall (1b) and an element of absorbent material (3) fixed therein, the chamber being open at two opposite ends to permit (i) the insertion of said strip, in such a manner that the reactive surface and the opposite end of said strip are on the outside, and (ii) the removal of said strip through said chamber, after the biological material has been deposited on the reactive surface (R) and a prefixed reaction time between the reactive surface and the said biological material has elapsed, so that said reactive surface closely contacts said element of absorbent material (3) when a pressure is exerted on said wall (1b). The invention will now be illustrated in greater detail by the description, which follows, of one of its embodiments, on an exemplifying and non-limiting basis, given with reference to the accompanying drawings, in which: Figure 1 shows a hygienic device according to the present invention, in which a reactive strip ready for use has been inserted on an exemplifying basis; Figure 2 is a profile view of the device according to Figure 1; Figure 3 illustrates the device of Figure 1 in the open condition. With reference to the aforementioned figures, 1 indicates a flat element of substantially rigid or semi-rigid material folded into two parts 1a and 1b along a preprinted transverse ribbing line 2. The flat element 1 may be constructed, for example, of card which is preferably externally plastic-coated, in order to impart thereto a sufficient impermeability. On the internal face of one of the two parts of the flat element 1, for example on the internal face of the part 1b, there is fixed an absorbent element 3 (for example cotton, gauze, cellulose in general, synthetic material and the like). Along the two free sides of the two parts 1a and 1b, parallel to the ribbing line 2, there extend two tabs 4, by means of which the two aforementioned parts of the flat element 1 are closed, for example by means of adhesive, in such a manner as to form a flattened chamber, in the present embodiment, within which the absorbent element 3 is contained. A projecting edge 5 is then provided along one of the remaining sides of the part 1a of the flat element 1, i.e. that to which, in the present embodiment of the invention, the absorbent element 3 is not fixed. Finally, the part 1b, to which the absorbent element 3 is fixed, exhibits a further intermediate transverse fold line 6, as a result of which the part 1b assumes a shape which is substantially that of an inverted V broadly opened out towards the internal face of the part 1a. In the use of the hygienic support according to the invention, a reactive strip S is inserted within the flat element 1 which has been folded and closed, and in particular between the internal face of the part 1a and the absorbent element 3 fixed to the internal face of the part 1b. The insertion is facilitated by the fact that the part 1b is V-shaped, as a result of which, centrally, the absorbent element 3 is not compressed against the internal face of the part 1a. The reactive surface R of the strip S is positioned in correspondence with the edge 6, which consequently acts as support for the same, while the part 1a itself serves as sliding base for the strip S. After the organic material has been deposited on the reactive surface R, and the predetermined reaction time has elapsed, the strip S is extracted from the covering in such a manner that the reactive surface R slides in contact with the absorbent element 3, which cleans it and dries it. During the removal of the strip S, in order to ensure an improved contact with the absorbent element 3, it is expedient to press the part 1b centrally against the part 1a, in correspondence with the fold line 6. Once removed, the strip S is perfectly cleaned and dried and ready for the completion of the reaction, while the device is thrown away. It may be advantageous to provide on the part of the flat element 1 to which the absorbent element 3 is fixed (the part 1b, in the embodiment illustrated here) a liftable flap 7 taken along the transverse fold line 6 in correspondence with the margin close to the projecting edge 5, on which rests the portion of the strip S carrying the reactive surface R. In this way, even in the presence of reactive surfaces of solid thickness, the entrance of such surface R between the part 1a and the absorbent element 3 is not obstructed. By virtue of this expedient, moreover, the contact pressure which the absorbent element exerts on the reactive surface R is substantially constant from one test to the other and independent of the pressure exerted by the operator. It must, in fact, be borne in mind that, while the operator presses on the zone 8 of the support, which zone is indicated by the broken line in Figure 1, the cleaning of the reactive surface R takes place almost exclusively in correspondence with the absorbent area portion 3 underneath, or near, the liftable flap 7. This ensures a marked reliability of the results of the tests. In particular, when the reactive strip is used for tests on blood, a drop of which is generally taken from a finger, the part 1b may exhibit an opening in correspondence with the zone 8. From such opening a portion of the absorbent element 3 underneath is accessible, which can therefore be used to clean the point where the blood was taken. In this case, the absorbent element may be formed by two distinct elements, one of which is applied in proximity to the liftable edge 7 and intended to clean the reactive strip, and the other applied in correspondence with the opening 8 to clean the finger. Clearly, the configuration and the dimensions of the disposable hygienic device according to the present invention, illustrated above, are purely exemplifying and indicative, and it is clear that this may be implemented in any tubular or non-tubular conformation (for example folding) provided that it is suitable for the positioning of a reactive strip and for its subsequent cleaning and drying by means of contact with an absorbent element contained therein. The flat element 1 may then be constructed of any suitable material, provided that it has sufficient rigidity and, preferably, impermeability, such as, for example, polystyrene, PVC, tin foil, possibly covered with PVC etc. The absorbent element 3 may also be impregnated with chemical substances of various types, which are suitable, for example, to react with the reactive surface or with other specific properties. The disposable hygienic device according to the invention may be supplied in packs containing one or more units, possibly contained in cellophane-wrapped bags. Moreover, the hygienic device according to the invention may advantageously be supplied in combination with the reactive strip in suitable packs in foil, already inserted into the device and ready for use. The invention is not limited to the embodiment described and illustrated above, but includes any variants of implementation thereof.

Claims: A disposable hygienic device for cleaning and drying a reactive surface (R) at one end of a diagnostic strip (S) of an excess of biological material to be analyzed placed on said surface, characterized in that it comprises a rigid chamber with a depressible wall (1b) and an element of absorbent material (3) fixed therein, the chamber being open at two opposite ends to permit (i) the insertion of said strip, in such a manner that the reactive surface and the opposite end of said strip are on the outside, and (ii) the removal of said strip through said chamber, after the biological material has been deposited on the reactive surface (R) and a prefixed reaction time between the reactive surface (R) and the said biological material has elapsed, so that said reactive surface (R) closely contacts said element of absorbent material (3) when a pressure is exerted on said wall (1b). A device according to claim 1, in which said chamber is formed by a flat element (1) folded into two parts (1a, 1b) along an intermediate ribbing line (2), said depressible wall (1b) being one of said two parts (1a, 1b) to which said element of absorbent material (3) is fixed. A device according to claim 2, in which the part of said flat element to which the said absorbent element is fixed exhibits an inverted V profile above the other part thereof. A device according to any one of claims 2 and 3, in which said parts are connected to each other along respective edges (4) opposite to said ribbing line (2). A device according to any one of claims 2 to 4, in which the part of flat element (1) to which said element of absorbent material (3) which is not fixed has an extended side (5) for supporting the reactive surface (R) portion of said strip (S). A device according any one of claims 2 to 5, in which the part of said flat element (1) to which said element of absorbent material (3) is fixed has a liftable flap (7) formed at an intermediate position of the side facing said extended side (5). A device according to any one of claims 2 to 6, in which an opening (8) is formed on said part to which said element of absorbent material (3) is fixed in correspondance to the latter and in a position remote from said extended side (5).

Inventors: SAGGIORATO, RENATO
Applicants: SAGGIORATO, RENATO
Application year: 1988
Main classification: G01N33
IPC codes: B01L3, B01L11