Substance delivery device

• US 20040247651A1
• Filed: 04/14/2004
• Published: 12/09/2004
• Est. Priority Date: 10/16/2001
• Status: Abandoned Application

• Current Assignee: Reckitt Benckiser Pty Limited (Reckitt Benckiser Group PLC)
• Original Assignee: Reckitt Benckiser Pty Limited (Reckitt Benckiser Group PLC)
• Inventors: Morgan, John Douglas Peter
• Application Number:
  US10/492,781
• Publication Number:
  US 20040247651A1
• Time in Patent Office: Days
• US Class Current: 424/443
• CPC Class Codes: A01M 1/2077 using an electrical resistance as heat source A01M1/2083 takes precedence
• CPC Class Codes: A01M 2200/012 Flying insects
• CPC Class Codes: A61L 9/02 using substances evaporated in the air by heating or combustion
• CPC Class Codes: A61L 9/03 Apparatus therefor
• CPC Class Codes: A61L 9/12 Apparatus, e.g. holders, therefor

Abstract

A substance delivery device is provided which provides for long-term release of active substances such as insecticides from a substrate impregnated with the active substances. Also provided is a method for producing the device and the use of the device in the delivery one or more active substances to the atmosphere.

Claims

1. A substance delivery device comprising (i) a substrate layer impregnated with one or more active substances, (ii) an outer layer which encloses the substrate layer and is substantially impermeable to the one or more active substances, and (iii) one or more apertures in the outer layer which permit release of the one or more active substances from the substrate layer into the atmosphere;

characterised in that the substrate layer is in direct fluid communication with the atmosphere;

the apertures are present only in a portion of the outer layer which in use is exposed to the atmosphere, and the total surface area of the apertures is less than 2% of the total surface area of the outer layer such that the one or more active substances are released into the atmosphere at a substantially linear rate.

2. A device according to claim 1 wherein the apertures constitute less than 1% of the total surface area of the outer layer.

3. A device according to claim 1 wherein the substrate layer further comprises one or more solvents.

4. A device according to claim 3 wherein at least one of the solvents has a molar enthalpy of vaporisation greater than 9 kcal/mol.

5. A device according to claim 1 wherein the substrate layer is heated to release the one or more active substances into the atmosphere

6. A device according to claim 1 wherein at least one of the apertures is present substantially in the centre of said portion which in use is exposed to the atmosphere.

7. A device according to claim 1 wherein there is only one aperture in the outer layer.

8. A device according to claim 1 where the substrate layer comprises one or more holes which are in at least partial alignment with the one or more apertures.

9. A device according to claim 8 wherein the holes extend partially through the substrate layer.

10. A device according to claim 9 wherein the holes extend completely through the substrate layer.

11. A device according to claim 1 which is substantially flat.

12. A device according to claim 11 wherein the substrate layer is a fibrous mat.

13. A device according to claim 1 wherein at least one of the one or more active substances is an insecticidal substance.

14. A device according to claim 13 wherein the insecticidal substance is a pyrethroid.

15. A device according to claim 13 wherein the substrate layer comprises an indicator layer comprising a material the light transmitting properties of which vary depending on the amount of solvent present in the substrate.

16. A substance delivery device for delivering one or more active substances to the atmosphere which device comprises a device according to claim 1 together with removable sealing means for sealing said apertures prior to use.

17. A method for producing a device according to claim 1 which comprises sealing a substrate layer comprising one or more active substances in an outer layer which is impermeable to the one or more substances;

and introducing one or more apertures in the outer layer.

18. A method for producing a device according to claim 1 which comprises sealing a substrate layer comprising one or more active substances in an outer layer which is impermeable to the one or more substances and which comprises one or more apertures.

19. A method according to claim 17 which further comprises sealing said one or more apertures with a removable sealing means.

20. A method for releasing one or more active substances into the atmosphere which method comprises heating a device according to claim 1 so as to cause release of the one or more active substances into the atmosphere via the apertures in the outer layer.

21. A method for inhibiting insect biting which method comprises heating a device according to claim 1, wherein at least one of the one or more active substances is an insecticidal substance, so as to cause release of the one or more insecticidal substances into the atmosphere via the apertures in the outer layer.