Desiccation Chamber and Methods for Drying Biological Materials

• US 20090090022A1
• Filed: 10/07/2008
• Published: 04/09/2009
• Est. Priority Date: 10/09/2007
• Status: Abandoned Application

• Current Assignee: Hememics Biotechnologies, Inc.
• Original Assignee: Hememics Biotechnologies, Inc.
• Inventors: HO, David H., BRUTTIG, Stephen P.
• Application Number:
  US12/246,951
• Publication Number:
  US 20090090022A1
• Time in Patent Office: Days
• US Class Current: 34/406
• CPC Class Codes: F26B 11/12 in stationary drums or other mainly-closed receptacles with moving stirring devices F26B11/22 takes precedence
• CPC Class Codes: F26B 21/06 Controlling, e.g. regulating, parameters of gas supply F26B21/14 takes precedence; control in general G05
• CPC Class Codes: F26B 21/14 using gases or vapours other than air or steam , e.g. inert gases
• CPC Class Codes: F26B 25/12 Walls or sides; Doors
• CPC Class Codes: F26B 25/225 by repeated or continuous weighing of the material or a sample thereof
• CPC Class Codes: F26B 3/28 by radiation, e.g. from the sun
• CPC Class Codes: F26B 5/04 by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum F26B11/049 and F26B17/128 take precedence

Abstract

Methods and devices of drying biological materials are described, including a desiccation chamber that may be used to dry biological materials while substantially preserving functional integrity of those materials. The desiccation devices and methods provide optimal conditions and ease of use for drying biological materials. The devices and methods provided here may be used to prepare biological materials for use in one or more of diagnostic, therapeutic, industrial, and research applications.

Claims

1. A drying device for drying a biological material to a desired moisture content while preserving functional integrity of the biological material, comprising:

one or more walls defining a desiccation chamber;

an opening for placing a biological material into the desiccation chamber;

an access door proximate the opening for selectively covering the opening;

a support mechanism in the desiccation chamber for supporting the biological material within the desiccation chamber;

a weight sensing mechanism in the desiccation chamber for sensing a weight of the biological material being dried in the desiccation chamber;

a temperature control mechanism for regulating the temperature in the desiccation chamber, the temperature control mechanism comprising a heater operatively coupled to the desiccation chamber, and a temperature sensor in the desiccation chamber for sensing a temperature in the desiccation chamber; and

a humidity control mechanism for regulating a moisture level within the desiccation chamber, the humidity control mechanism comprising a humidity sensor for sensing a moisture level in the desiccation chamber.

2. The drying device of claim 1, further comprising a gas control mechanism operatively coupled to the desiccation chamber for regulating a level of gas in the desiccation chamber.

3. The drying device of claim 2, wherein the desiccation chamber may be filled with an inert gas, and the gas control mechanism maintains the desiccation chamber under gaseous saturation.

4. The drying device of claim 2, wherein the gas control mechanism further comprises:

a gas inlet and inlet valve for controlling a flow of gas into the desiccation chamber; and

a gas outlet and outlet valve for controlling a flow of gas out of the desiccation chamber.

5. The drying device of claim 4, wherein the gas outlet and outlet valve are operatively coupled to a vacuum source for creating a sub-atmospheric condition within the desiccation chamber.

6. The drying device of claim 1, further comprising a contamination control mechanism operatively coupled to the desiccation chamber.

7. The drying device of claim 6, wherein the contamination control mechanism further comprises a device to generate ultra-violet light or gamma radiation.

8. The drying device of claim 1, further comprising a motion mechanism disposed within the desiccation chamber for moving the biological material within the desiccation chamber to ensure thorough mixing and equal exposure of the biological material to drying.

9. The drying device of claim 8, wherein the motion mechanism further comprises one of:

a turn table, a shaking device, an orbital shaker device, a vibrating device, a rocker device, or a motion device.

10. The drying device of claim 1, wherein the temperature control mechanism further comprises an air circulating device operatively coupled to the desiccation chamber for circulating an atmosphere within the desiccation chamber.

11. The drying device of claim 1, wherein the temperature control mechanism regulates a temperature in the desiccation chamber in a range of about 70 and about 105 degrees Fahrenheit.

12. The drying device of claim 1, wherein the humidity control mechanism regulates a humidity level in the desiccation chamber in a range of about 0% and about 5% relative humidity.

13. The drying device of claim 1, wherein the gas control mechanism regulates a gas level within the desiccation chamber by evacuating a gas from the desiccation chamber to create a sub-atmospheric condition within the desiccation chamber.

14. The drying device of claim 1, wherein the gas control mechanism regulates a gas level within the desiccation chamber by introducing an inert gas into the desiccation chamber.

15. The drying device of claim 1, further comprising a control module for controlling one or more of:

the temperature control mechanism, the humidity control mechanism, the gas regulating mechanism, the contaminant control mechanism, the weight sensing mechanism, and/or the motion mechanism.

16. The drying device of claim 15, wherein the weight sensing mechanism is operatively coupled to the support mechanism, wherein the weight sensing mechanism measures a change in weight of the biological material disposed on the support mechanism during the drying process, and the control module determines a moisture content of the biological material based upon a change in weight of the biological material.

17. The drying device of claim 1, further comprising:

a seal between the opening and the access door of the desiccation device for forming an airtight, or substantially airtight, seal between the opening and the access door;

wherein the one or more walls comprise a double wall construction having an inner wall and an outer wall; and

insulation disposed between the inner wall and the outer wall, the insulated double wall construction maintaining a stable temperature within the desiccation chamber.

18. The drying device of claim 1, further comprising a computing device for controlling the drying device.

19. A desiccation method for drying a biological material comprising:

placing a biological material into a desiccation chamber of a desiccation device;

supplying the desiccation chamber with an inert gas to a predetermined level;

heating the inert gas and biological material in the desiccation chamber;

regulating the temperature within the desiccation chamber to a predetermined range;

regulating the humidity within the desiccation chamber to a predetermined range;

measuring a weight of the biological material being dried in the desiccation chamber;

removing the dried biologic material from the desiccation chamber once the biological material is dried to a predetermined level of dryness.

20. The method of claim 19, further comprising reducing contamination of the biological material to a predetermined level to inactivate potential pathogens.

21. The method of claim 19, further comprising:

measuring a change in weight of the biological material during the drying process; and

determining a moisture content of the biological material based upon a change in weight of the biological material.

22. The method of claim 19, further comprising exposing the biological material to substantially equal drying during the desiccation process by:

moving the biological material about within the desiccation chamber using a motion mechanism; and

mixing the biological material through the movement of the biological material.

23. The method of claim 19, wherein supplying an inert gas to a predetermined level further comprises supplying nitrogen approaching and approximating 100%.

24. The method of claim 19, wherein regulating the temperature to a predetermined level further comprises regulating the temperature between about 70 and about 105 degrees Fahrenheit.

25. The method of claim 19, wherein regulating the humidity within a predetermined range further comprises regulating the humidity between about 0% and about 5% relative humidity.

26. The method of claim 19, wherein removing the biological material at a predetermined level of dryness further comprises removing the biological material when the biological material is in a dry state.

27. The method of claim 19, wherein removing the biological material at a predetermined level of dryness further comprises removing the biological material when the biological material is in a semi-dry state.

28. The method of claim 19, further comprising controlling one or more functions of the operation of the desiccation device using a control module and microprocessor.

29. A drying device for drying a biological material comprising:

a desiccation chamber;

a support mechanism in the desiccation chamber for supporting the biological material within the desiccation chamber;

a weight sensing mechanism in the desiccation chamber for sensing a weight of the biological material being dried in the desiccation chamber;

a temperature control mechanism for regulating the temperature in the desiccation chamber, the temperature control mechanism comprising a heater operatively coupled to the desiccation chamber, and a temperature sensor for sensing a temperature in the desiccation chamber;

a humidity control mechanism for regulating a moisture level within the desiccation chamber, the humidity control mechanism comprising a humidity sensor for sensing a moisture level in the desiccation chamber; and

a gas control mechanism operatively coupled to the desiccation chamber for regulating a level of inert gas in the desiccation chamber.

30. The drying device of claim 29, further comprising a contamination control mechanism operatively coupled to the desiccation chamber, the contamination control mechanism regulating contaminants in the desiccation chamber.

31. The drying device of claim 29, further comprising a computing device for controlling one or more functions/conditions/parameters for the drying device.