Detection strip for detecting and identifying chemical air contaminants, and portable detection kit comprising said strips

• US 5,035,860 A
• Filed: 02/20/1990
• Issued: 07/30/1991
• Est. Priority Date: 02/24/1989
• Status: Expired due to Fees

• Current Assignee: Duphar International Research B.V. (Abbott Laboratories)
• Original Assignee: Duphar International Research B.V. (Abbott Laboratories)
• Inventors: Kooijmans, Kees R., Kleingeld, Adriaan, Kragtwijk, Wilhelmus F.
• Primary Examiner(s): Warden, Robert J.
• Assistant Examiner(s): Hampel, Howard
• Application Number:
  US07/481,322
• Time in Patent Office: 525 Days
• Field of Search: 422/56, 422/58, 422/61, 422/86-88, 436/165, 436/167, 436/104, 436/902, 435/810
• US Class Current: 422/413
• CPC Class Codes: G01N 31/22 using chemical indicators G01N31/02 takes precedence

Abstract

The invention relates to a portable detection kit including a number of detection strips and at least one device for breaking reservoirs within the detection strips. The detection strips detect and identify chemical air contaminants and comprise a holder. The holder has a plurality of spaced carriers which are capable of absorbing the air contaminants and optionally comprise reagents which can be influenced by the air contaminants. The holder further has a plurality of color-producing agents opposite to the carriers. The agents, in contact with the absorbed air contaminants or with the reagents, can cause a color reaction in the presence of a liquid. The color-producing agents, which are dissolved in the quantities of liquid required for the color reaction, are held in closed reservoirs having easily breakable walls. The collective reservoirs are provided between the carriers and a flexible strip is such a manner that when mechanical pressure is exerted on the flexible strip at the area of the reservoirs, the flexible strip will yield, as a result of which the reservoirs will break and the contents thereof will be contacted with the absorbed air contaminants or with the reagents.

Claims

1. A portable detection kit for detecting and identifying chemical air contaminants, comprising a number of detection strips and at least one device for breaking the reservoirs contained in the detection strips,

said device comprising one or more spaced switches, a base plate and an open space between the switches and the base plate which is proportioned so that a detection strip can be inserted into it, in which the switches can be switched, and are constructed so that in the presence of a detection strip provided in the device, upon switching a mechanical pressure is exerted on the reservoirs via a flexible strip, said pressure causing the reservoirs on the carriers supported by the base plate to be broken,

wherein the detection strips each comprise a holder having a plurality of spaced carriers, which are capable of absorbing the air contaminants and having a plurality of color-producing agents opposite the carriers, which agents, in contact with the absorbed air contaminants, can cause a color reaction in the presence of a liquid, said detection strip being characterized in that the color-producing agents, dissolved in the quantities of liquid required for the color reaction, are contained in closed reservoirs having walls which are easily broken by mechanical force, and the collective reservoirs are provided between the carriers and a flexible strip in such a manner that when a mechanical pressure is exerted on said flexible strip at the area of the reservoirs said flexible strip will yield, as a result of which the reservoirs, which are supported by a suitable support, will break and the contents thereof will be contacted with the absorbed air contaminants.

2. A detection kit as claimed in claim 1, wherein the base plate of the device for breaking the reservoirs provided in the detection strips comprises one or more thermostatic heating elements.

3. A detecttion kit as claimed in claim 1 or 2, wherein the reservoirs are manufactured from glass and the switches are constructed as tilting cams which can be pivoted around a pin, said cams causing the glass reservoirs to be broken when the switches are moved from a quiescent state into an operative state.

4. A detection kit as claimed in claim 3, wherein the tilting cams are constructed so that, after switching to the operative state, they are blocked by the presence of a detection strip provided in the device and that they can return to their quiescent state only after removing the detection strip.

5. A detection kit as claimed in claim 1, wherein the spaced carriers further comprise reagents disposed on the spaced carriers which reagents are affected by the air contaminants and exhibit or prevent a color reaction upon exposure to such air contaminants.