Method of supporting and/or applying particulate materials

• US 20070054040A1
• Filed: 09/08/2005
• Published: 03/08/2007
• Est. Priority Date: 09/08/2005
• Status: Active Grant

• Current Assignee: Medafor Incorporated (Becton, Dickinson & Co)
• Original Assignee: Medafor Incorporated (Becton, Dickinson & Co)
• Inventors: Skow, Lynn, Drake, James
• Granted Patent: US 7,517,355 B2
• Time in Patent Office: Days
• US Class Current: 427/180
• CPC Class Codes: A61L 26/0023 Polysaccharides
• CPC Class Codes: A61L 26/0085 Porous materials, e.g. foams or sponges
• CPC Class Codes: B05B 11/062 designed for spraying particulate material
• CPC Class Codes: B05B 7/1413 Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising a container fixed to the discharge device
• CPC Class Codes: B05D 1/28 performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
• CPC Class Codes: B05D 2401/32 applied as powders
• CPC Class Codes: C08L 5/02 Dextran; Derivatives thereof

Abstract

Masses of particles are structurally supported by the application of vacuum through a support surface having holes thereon that are smaller than the average diameter of the particle mass that is to be supported. The reduced pressure structurally supports particles on the support surface. The mass of particles tends is so well supported that it tends retain its shape unless additional forces are applied. The system comprises the vacuum applicator (e.g., pump), a vacuum carrying system and the support surface. When a mass of particles is supported on the support surface under vacuum, the particles can be carried to a target surface, the mass of particles pressed against the target surface, the mass conforming to the target surface, and the vacuum reduced or stopped, depositing the particle mass onto the surface in excellent shape compliance with that surface.

Claims

1. A method of applying particulates to a surface comprising:

providing at a location a mass of particulates having an average particle diameter;

providing a porous surface with pores having a shortest average dimension of pore openings,

the shortest average dimension of pore openings being less than the average particle diameter,

providing a gas pressure on a first side of the porous surface,

providing a lesser gas pressure on a second side of the porous surface to create a pressure differential across the porous surface,

contacting the first side of the porous surface with the mass of particulates,

removing the porous surface from the location, carrying a portion of the mass of particulates on the first side of the porous surface by pressure established by the differential pressure.

2. The method of claim 1 wherein the portion of the mass of particles comprises a layer of particles having an average of at least 20 particles thickness in the portion of the mass of particles across the porous surface.

3. The method of claim 1 wherein the thickness of the portion of the mass of particles comprises at least 1 mm in thickness.

4. The method of claim 1 wherein the average particle diameter is less than 10,000 microns.

5. The method of claim 1 wherein the average particle diameter is less than 1,000 microns.

6. The method of claim 1 wherein the average particle diameter is between 1 and 1,000 microns.

7. The method of claim 2 wherein the pressure differential is at least 50 mm Hg.

8. The method of claim 3 wherein the pressure differential is at least 50 mm Hg.

9. The method of claim 3 wherein the pressure differential is at least 100 mm Hg.

10. The method of claim 3 wherein the pressure differential is at least 100 mm Hg.

11. The method of claim 8 wherein the porous surface comprises a filter on a support.

12. The method of claim 9 wherein the porous surface comprises a filter on a support.

13. The method of claim 10 wherein the porous surface comprises a filter on a support.

14. The method of claim 1 wherein the portion of the mass of particles is pressed against a second surface while at least a portion of the pressure differential is maintained, a surface of the particle mass conforms to contours on the second surface, the pressure differential is reduced, the porous surface is moved away from the second surface and at least a second portion of the portion of particle mass is left against the second surface.

15. The method of claim 14 wherein application of the particles comprises a method for enhancing the formation of clots on a wound of an animal where blood is present comprising the steps of applying porous particles of dimensions of from about 0.5 to 1000 micrometers as the second portion of particle mass to at least a portion of said wound where blood is present in said wound, allowing said porous particles to remain in contact with said blood in said wound while clotting initiates in said wound.

16. The method of claim 15 wherein said porous particles have molecular sieve cutoff values between about 5,000 Daltons and 200,000 Daltons.

17. The method of claim 14 wherein said pores comprise from 5 to 35% of the volume of the porous particles.

18. The method of claim 14 wherein said particles are applied to a surface of said wound with blood as free-flowing particles.

19. The method of claim 14 wherein said porous particles are applied to said wound surface along with another material selected from the group consisting of antibiotics, antifungal agents, topical pain reducing medication, pharmaceuticals, anti-inflammatants, and tissue enzyme inhibitors.

20. The method of claim 14 wherein the wound comprises broken soft tissue within a human body.

21. A method for enhancing the formation of clots on a wound of an animal where blood is present comprising the steps of applying porous particles according to the process of claim 14, the particles having average diameter dimensions of from about 0.5 to 1000 nanometers to at least a portion of said wound where blood is present, allowing said porous particles to remain in contact with said blood while clotting initiates.