Reel-to-reel bioforensic aerosol collection and storage system

• US 8,506,686 B2
• Filed: 02/02/2011
• Issued: 08/13/2013
• Est. Priority Date: 02/03/2010
• Status: Active Grant

• Current Assignee: Midwest Research Institute
• Original Assignee: Midwest Research Institute
• Inventors: Langle, Joseph M., Fischer, Michael F., Egan, James M., Waller, Alexander J., Clement, Joseph W., Radke, Darren J.
• Primary Examiner(s): Chiesa, Richard L
• Application Number:
  US13/019,494
• Publication Number:
  US 20110185904A1
• Time in Patent Office: 923 Days
• Field of Search: 96/19, 96/25, 96 39- 43, 96/52, 96/94, 96/98, 535/45, 422/62, 422/66, 422/83, 422/88, 493/189, 493/194
• US Class Current: 96/39
• CPC Class Codes: B01D 46/42 Auxiliary equipment or operation thereof
• CPC Class Codes: B03C 2201/04 Ionising electrode being a wire
• CPC Class Codes: B03C 3/08 characterised by presence of stationary flat electrodes arranged with their flat surfaces parallel to the gas stream
• CPC Class Codes: B03C 3/10 characterised by presence of electrodes moving during separating action
• CPC Class Codes: B03C 3/155 Filtration
• CPC Class Codes: B03C 3/45 Collecting-electrodes
• CPC Class Codes: B03C 3/47 flat, e.g. plates, discs, gratings
• CPC Class Codes: B03C 3/51 Catch- space electrodes, e.g. slotted-box form
• CPC Class Codes: B03C 3/68 Control systems therefor electricity supply or control systems for cleaning the electrodes B03C3/746, B03C3/763
• CPC Class Codes: B03C 3/88 Cleaning-out collected particles

Abstract

A reel-to-reel aerosol collection and storage system for capturing and storing a plurality of separate samples of aerosol particles using electrostatic precipitation technology for collecting such particles onto a tape mechanism for analysis at a future time. The particles are collected onto a region of the collection tape for a defined period of time and then that portion of the collection tape is advanced out of the collection zone and manipulated so as to form sealed pouches or pockets which can be either severed from the collection tape for individual storage in a temperature controlled storage container, or which can be stored on a take-up reel in a temperature controlled environment. The collected aerosol particles are stored with a buffer fluid to preserve and maintain the viability of the collected particles for future extraction and analysis. Several embodiments for forming sealed pouches or pockets and methods of storing the collected particles are disclosed.

Claims

1. An aerosol collection and storage system for capturing and storing aerosol particles comprising:

an inlet for receiving ambient air into the system;

an outlet for allowing ambient air to exit the system;

a collection zone for receiving the ambient air from said inlet;

a first feed reel for holding an unexposed collection tape for movement through said collection zone;

a second take-up reel for receiving and storing the collection tape from said first feed reel, said collection tape being movable from said first feed reel through said collection zone and onto said second take-up reel;

means for collecting the aerosol particles contained within the ambient air which passes through said collection zone onto that portion of the collection tape located within said collection zone;

a pouch forming mechanism located between said collection zone and said second take-up reel, said pouch forming mechanism including apparatus for folding the collection tape containing the collected aerosol particles onto itself;

a dispensing mechanism for injecting a fluid into the folded collection tape containing the collected aerosol particles;

heat sealing means for sealing a portion of the folded collection tape to form a sealed pouch containing the collected aerosol particles and the injected fluid;

heat sealing means for heat sealing the folded collection tape at a location above the sealed pouch;

means for severing the folded collection tape at a location between the sealed pouch and the heat sealed location above said sealed pouch; and

a storage container for receiving the severed sealed pouch.

2. The aerosol collection and storage system defined in claim 1 wherein said collection tape remains stationary for a predetermined period of time within said collection zone during the collection of the aerosol particles onto that portion of said collection tape located therein.

3. The aerosol collection and storage system defined in claim 1 wherein said means for collecting the aerosol particles contained within the ambient air onto that portion of the collection tape located within said collection zone includes an electrostatic precipitator system for electrically charging the aerosol particles as they flow through said collection zone.

4. The aerosol collection and storage system defined in claim 3 wherein said electrostatic precipitator system includes at least one electrode and an oppositely charged collection surface, said collection tape being movable between said at least one electrode and said oppositely charged collection surface.

5. The aerosol collection and storage system defined in claim 1 wherein said collection tape is coated with a water soluble material.

6. The aerosol collection and storage system defined in claim 1 wherein said means for severing the folded collection tape includes heat severing means.

7. The aerosol collection and storage system defined in claim 1 wherein said system is portable.

8. The aerosol collection and storage system defined in claim 1 wherein said storage container is temperature controlled.

9. The aerosol collection and storage system defined in claim 1 including a blower system for drawing ambient air into said inlet.

10. The aerosol collection and storage system defined in claim 1 including means for advancing the collection tape unto said second take-up reel after the sealed pouch has been severed therefrom.

11. The aerosol collection and storage system defined in claim 10 wherein said means for advancing the said collection tape onto said second take-up reel includes an electronic control system for sequentially moving a portion of said collection tape into and out of said collection zone.

12. The aerosol collection and storage system defined in claim 1 wherein said apparatus for folding the collection tape includes a reciprocally movable carriage platform, said carriage platform including a pair of spaced apart retractable and extendable pin members and being movable between a first position wherein said pin members, when extended, extend over a portion of said collection tape, and a second position wherein said pin members are engaged with said collection tape and have positioned said collection tape in a folded configuration.

13. The aerosol collection and storage system defined in claim 1 wherein said heat sealing means includes a pair of plate members, said pair of plate members being positioned and located such that said folded collection tape is positioned therebetween, said pair of plate members being movable into contact with each other and including heat sealing portions for sealing said formed pouch.

14. The aerosol collection and storage system defined in claim 1 including an onboard computer system and an associated electronics package for controlling and sequencing all of the operations of said system.

15. The aerosol collection and storage system defined in claim 14 including a user programmable interface for allowing a user to program system parameters for controlling the operation of said system.

16. The aerosol collection and storage system defined in claim 15 wherein said programmable system parameters include sample flow rate, collection start/stop times, collection duration time and frequency, and temperature of storage container.

17. The aerosol collection and storage system defined in claim 14 including data storage capability for recording the date, sample flow rate, and collection start and stop times for each formed sealed pouch containing the collected aerosol particles therewithin.

18. The aerosol collection and storage system defined in claim 1 wherein said collection tape is sequentially moved through said collection zone for collecting and storing a plurality of formed sealed pouches, each sealed pouch containing collected aerosol particles.

19. The aerosol collection and storage system defined in claim 1 wherein said sealed pouch includes identification means relating to the collected aerosol particles contained therein.

20. The aerosol collection and storage system defined in claim 19 wherein said identification means includes a barcode associated with each respective sealed pouch for identifying the collected aerosol particles contained therein.

21. The aerosol collection and storage system defined in claim 20 including an onboard computer system for recording the barcode associated with each respective sealed pouch.

22. The aerosol collection and storage system defined in claim 21 including a barcode scanner for automatically reading the barcode associated with each respective sealed pouch, said onboard computer system associating each respective barcode with data associated with the collected aerosol particles stored in each respective sealed pouch.

23. The aerosol collection and storage system defined in claim 22 wherein the data associated with the collected aerosol particles stored in each respective sealed pouch includes date, sample flow rate, and collection start and stop times.

24. An aerosol collection and storage system for capturing and storing aerosol particles comprising:

an inlet for receiving ambient air into the system;

an outlet for allowing ambient air to exit the system;

a collection zone for receiving ambient air from said inlet;

a first reel for holding an unexposed collection tape for movement through said collection zone;

a second reel for receiving and storing said collection tape from said first reel, said collection tape being sequentially movable from said first reel through said collection zone and onto said second reel;

an electrostatic precipitator system for collecting aerosol particles contained within the ambient air onto that portion of said collection tape located within said collection zone as the ambient air passes through said collection zone;

a pouch forming mechanism located between said collection zone and said second reel, said pouch forming mechanism including a pair of plate members positioned in spaced apart relationship relative to each other and a pair of spaced apart retractable and extendable pin members, said pin members being movable between a first position wherein said pin members, when extended, extend over a portion of said collection tape and a second position wherein said pin members, when extended, engage said collection tape and position said collection tape in a folded arrangement between said pair of plate members, said plate members being movable into engagement with each other thereby folding the collection tape onto itself in an overlapped configuration, the collected aerosol particles being positioned between said overlapped collection tape portions, said plate members having portions thereof for heat sealing the side edges of the overlapped collection tape portion to form a pouch having one side open;

said pair of plate members further including a portion thereof for heat sealing the open portion of said pouch for forming a sealed pouch containing the collected aerosol particles;

said pair of plate members further including a portion thereof for heat sealing the overlapped collection tape at a location above the sealed pouch;

said pair of plate members further including a portion thereof for heat severing said overlapped collection tape at a location between said sealed pouch and the heat sealed location above said sealed pouch;

a storage container for receiving the sealed pouch when severed from said collection tape; and

control means for advancing said collection tape onto said second reel after said sealed pouch has been severed therefrom.

25. The aerosol collection and storage system defined in claim 24 including a dispensing mechanism for injecting a buffer fluid into the open side portion of said pouch prior to heat sealing said open portion to faun a sealed pouch.

26. The aerosol collection and storage system defined in claim 24 including an onboard computer system and an associated electronics package for controlling the sequential movement of the collection tape through said collection zone, the movement of said pair of spaced pin members and said pair of plate members, the operation of said dispensing mechanism, and the operation of said heat sealing portions associated with said pair of plate members.

27. The aerosol collection and storage system defined in claim 26 wherein said onboard computer system controls the sample flow rate, the collection start and stop times, and the collection duration time and frequency.

28. The aerosol collection and storage system defined in claim 26 including a user programmable interface for allowing a user to program system parameters for controlling the operation of said system.

29. The aerosol collection and storage system defined in claim 26 including data storage means for recording and storing the date, collection start and stop times, and sample flow rate for each sealed pouch containing the collected aerosol particles therewithin.

30. The aerosol collection and storage system defined in claim 29 wherein each sealed pouch has a barcode associated respectively therewith, said onboard computer system being configured to read and record the barcode associated with each respective sealed pouch and to associate and store the date, collection start and stop times, and sample flow rate for the collected aerosol particles associated with each such sealed pouch with the corresponding barcode.

31. An aerosol collection and storage system for capturing and storing aerosol particles comprising:

an inlet for receiving ambient air into the system;

an outlet for allowing ambient air to exit the system;

a collection zone for receiving ambient air from said inlet;

a first reel for holding an unexposed collection tape for movement through said collection zone;

a second reel for receiving and storing said collection tape from said first reel, said collection tape being sequentially movable from said first reel through said collection zone and onto said second reel;

an electrostatic precipitator system for collecting aerosol particles contained within the ambient air onto that portion of said collection tape located within said collection zone as the ambient air passes therethrough;

a pouch forming mechanism located between said collection zone and said second reel, said pouch forming mechanism including a pair of plate members positioned in spaced apart relationship to each other and a pair of spaced apart retractable and extendable pin members which are reciprocally movable between a first position wherein said pin members, when extended, extend over a portion of said collection tape and a second position wherein said pin members, when extended, engage said collection tape and position said collection tape in an overlapping arrangement between said pair of plate members, said plate members being movable into engagement with each other thereby pressing said collection tape onto itself in an overlapped configuration, the collected aerosol particles being positioned between said overlapped collection tape portions;

said plate members having portions associated therewith for heat sealing the side edges of the overlapped collection tape portions to form a pouch having one side open;

a dispensing mechanism for injecting a buffer fluid into the open side portion of said pouch;

said pair of plate members further including a portion thereof for heat sealing the open side portion of said pouch for forming a sealed pouch containing the collected aerosol particles and the injected fluid therewithin; and

control means for advancing said collection tape and said sealed pouches onto said second reel for storage thereon.

32. The aerosol collection and storage system defined in claim 31 wherein said second reel and the sealed pouches stored thereon are in a temperature controlled environment.

33. The aerosol collection and storage system defined in claim 31 wherein the sealed pouches stored on said second reel are conductively cooled through said second reel.

34. The aerosol collection and storage system defined in claim 31 wherein each sealed pouch includes a barcode for identifying the collected aerosol particles associated with each respective sealed pouch.

35. The aerosol collection and storage system defined in claim 34 including an onboard computer system for recording the barcode associated with each respective sealed pouch and for associating each such barcode with data associated with the collected aerosol particles stored in each respective sealed pouch including date, sample flow rate, and collection start and stop times.

36. An aerosol collection and storage system for capturing and storing aerosol particles comprising:

an inlet for receiving ambient air into the system;

an outlet for allowing ambient air to exit the system;

a collection zone for receiving the ambient air from said inlet;

a first reel for holding an unexposed collection tape for movement through said collection zone;

a second reel for receiving and storing said collection tape from said first reel, said collection tape being movable from said first reel through said collection zone and onto said second reel;

an electrostatic precipitator system for collecting aerosol particles contained within the ambient air onto that portion of said collection tape located within said collection zone as the ambient air passes through said collection zone;

said collection tape being stationary for a predetermined period of time within said collection zone during the collection of the aerosol particles onto that portion of said collection tape located therein;

a third reel for holding at least one unexposed moistened pad stored on a tape material and covered with a protective cover, said moistened pad tape material being movable into contact with said collection tape after aerosol particles are collected thereon;

a fourth reel positioned and located for receiving and storing the protective cover associated with the moistened pad tape material as such protective cover is removed from such tape material en route to contact with said collection tape thereby exposing the at least one moistened pad;

said exposed at least one moistened pad being moved into contact with the collected aerosol particles on said collection tape after removal of said protective cover;

means for sealing the exposed at least one moistened pad to the collected aerosol particles on said collection tape when said at least one moistened pad is placed in contact with the collected aerosol particles; and

means for advancing the collection tape and associated moistened pad onto said second reel after the tape material containing said at least one moistened pad is sealed to said collection tape.

37. The aerosol collection and storage system defined in claim 36 wherein said moistened pad tape material is sealed to said collection tape through the use of adhesive means.

38. The aerosol collection and storage system defined in claim 36 wherein said moistened pad tape material is sealed to said collection tape through the use of heat sealing means.

39. The aerosol collection and storage system defined in claim 36 wherein said at least one moistened pad includes a buffer fluid for preserving and maintaining the viability of the collected aerosol particles for future extraction and analysis.

40. The aerosol collection and storage system defined in claim 36 wherein said moistened pad tape material includes a plurality of unexposed moistened pads, and wherein said collection tape is sequentially moved through said collection zone for collecting and storing a plurality of different groups of aerosol particles at spaced locations on said collection tape, and wherein said exposed moistened pads are sequentially moved into contact with the plurality of different groups of collected aerosol particles on said collection tape for storage on said second reel.