Methods and systems for electrospinning using low power voltage converter

Patent metadata

Field	Value
Publication number	US-11788207-B2
Application number	US-202117502611-A
Country	US
Kind code	B2
Filing date	Oct 15, 2021
Priority date	Feb 5, 2018
Publication date	Oct 17, 2023
Grant date	Oct 17, 2023

Abstract

An electrospinning system, method, and apparatus comprises a dual polarity high voltage power supply with much less power out for safe operation, a solution dispensing assembly held at high positive potential by the dual polarity power supply, a Corona discharge assembly held at high negative potential by the dual polarity power supply, and a drum collector held at ground potential wherein a solution is drawn from the solution dispensing assembly to the drum collector thereby forming a fiber mat.

First claim

What is claimed is:

1. An electrospinning system comprising:
a power supply;
a circulation assembly connected to the power supply, the circulation assembly comprising:
a dispenser;
a plurality of spikes arranged in a helical pattern and held at a potential by the power supply, at least one spike affixed to a rotating cylinder; and
a conduit configured to allow a solution to flow through the dispenser wherein the solution is deposited on the plurality of spikes; and

a collector wherein the solution is drawn from the plurality of spikes to the collector via a potential difference between the dispenser and collector, forming a fiber mat on the collector.

2. The electrospinning system of claim 1 wherein the circulation assembly comprises:
a solution tank;
a pump;
a conduit connecting the pump to the dispenser; and
an exit from the dispenser connecting the dispenser back to the solution tank.

3. The electrospinning system of claim 2 wherein the circulation assembly comprises:
at least one internal groove formed in the dispenser, wherein the at least one spike affixed to the rotating cylinder passes through the internal groove to contact the solution.

4. The electrospinning system of claim 3 wherein the circulation assembly comprises:
at least one slit formed in the dispenser, wherein the at least one spike affixed to the rotating cylinder passes through the slit.

5. The electrospinning system of claim 1 further comprising:
an array of one or more dry micro-tip needles beyond the collector.

6. The electrospinning system of claim 1 wherein each of the at least one spikes comprise needles.

7. The electrospinning system of claim 1 further comprising:
a motor and a drive shaft configured to rotate the rotating cylinder.

8. The electrospinning system of claim 1 wherein the collector comprises a drum collector.

9. The electrospinning system of claim 8 further comprising:
a ground connected to the drum collector.

10. The electrospinning system of claim 1 wherein the collector comprises a conveyor belt assembly.

11. The electrospinning system of claim 1 wherein the power supply comprises a dual polarity power supply.

12. An apparatus comprising:
a dual polarity power supply;
a circulation assembly connected to the power supply, the circulation assembly comprising:
a dispenser;
a plurality of spikes arranged in a helical pattern and held at a potential by the power supply, affixed to a rotating cylinder held at a potential by the dual polarity power supply; and
a conduit configured to allow a solution to flow through the dispenser wherein the solution is deposited on the plurality of spikes; and

a collector held at an opposite potential by the dual polarity power supply the solution is drawn from the plurality of spikes to the collector forming a fiber mat on the collector.

13. The apparatus of claim 12 wherein the circulation assembly comprises:
a solution tank;
a pump;
a conduit connecting the pump to the dispenser;
an exit from the dispenser connecting the dispenser back to the solution tank;
at least one internal groove formed in the dispenser, wherein the at least one spike affixed to the rotating cylinder passes through the internal groove to contact the solution; and
at least one slit formed in the dispenser, wherein the at least one spike affixed to the rotating cylinder passes through the slit.

14. The apparatus of claim 12 further comprising:
an array of one or more dry micro-tip needles beyond the collector.

15. The apparatus of claim 12 wherein each of the at least one spikes comprise needles.

16. The apparatus of claim 12 further comprising:
a motor and a drive shaft configured to rotate the rotating cylinder.

17. The apparatus of claim 12 wherein the collector comprises at least one of:
a drum collector; and
a conveyor belt assembly.

18. A method comprising:
holding a solution associated with a circulation assembly at a potential with a dual polarity power supply, the circulation assembly comprising: a dispenser, a plurality of spikes arranged in a helical pattern affixed to a rotating cylinder held at a potential by the dual polarity power supply, and a conduit configured to allow a solution to circulate through the dispenser and a solution tank;
holding a collector at an opposite potential with the dual polarity power supply; and
collecting a fiber mat on a collector wherein the solution is drawn from the circulation assembly to the collector according to a potential difference.

19. The method of claim 18 further comprising:
turning the collector with a motor, the collector comprising a drum collector.

20. The method of claim 18 wherein the dual polarity power supply is configured to operate at 4 watts of output power while maintaining a 0 to 40 kV DC and 0 to −20 kV DC output in dual polarity mode.

Assignees

• Fermi Res Alliance Llc

Inventors

• Bidhar Sujit

Classifications

• D01D5/0084 Primary

  Coating by electro-spinning, i.e. the electro-spun fibres are not removed from the collecting device but remain integral with it, e.g. coating of prostheses · CPC title

• D01D5/0038

  the fibre formed by solvent evaporation, i.e. dry electro-spinning · CPC title

• D01D5/0061

  characterised by the electro-spinning apparatus · CPC title

• D01D5/0069

  characterised by the spinning section, e.g. capillary tube, protrusion or pin · CPC title

• D01D5/0076

  characterised by the collecting device, e.g. drum, wheel, endless belt, plate or grid (D01D5/0046 takes precedence) · CPC title