# US 10,121,638 B1 · Atmospheric-pressure plasma jet generating device

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- Number: US 10,121,638 B1
- Document ID: US10121638B1
- Status: Granted
- Kind: B1
- Application number: 16/003,514
- Filed: 2018-06-08
- Granted: 2018-11-06
- Earliest claimed: 2018-02-13
- Assignees: National Chiao Tung University
- Applicants: National Chiao Tung University
- Inventors: Jong-Shinn Wu; Chih Tung Liu; Chun Ping Hsiao; Mu Chien Wu
- Web page: https://patentgrep.com/patent/US10121638B1

## CPC

- H01J 37/32009: {Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources (plasma generation in general H05H1/24)}
- H05H 1/2431: {using cylindrical electrodes, e.g. rotary drums}
- H05H 1/245: {the plasma being activated using internal electrodes}
- H05H 1/466: {using capacitive coupling means, e.g. electrodes}
- H05H 2240/10: at atmospheric pressure
- H05H 2245/36: Sterilisation of objects, liquids, volumes or surfaces
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)
- H05H: PLASMA TECHNIQUE (apparatus or processes specially adapted for producing X-rays H05G2/00); PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS

## Abstract

An atmospheric-pressure plasma jet generating device is disclosed, which comprises a housing, a discharge tube, an air inlet, and an outlet. The air inlet is connected to the outlet and the discharge tube. The discharge tube includes an internal electrode, a first dielectric material, and an external electrode. The first dielectric material is placed between the external electrode and the internal electrode, and there are some channels between internal electrode and first dielectric tube. An external power source is electrically connected to the internal electrode and the external electrode to generate a high electric field within the discharge tube. When the working gas flows through the discharge tube from the air inlet, the plasma is generated by the high electric field, and then flows out through the outlet. The present invention can generate non-thermal atmospheric-pressure plasma jet for biomedical processing.

## Claims

### Claim 1

An atmospheric-pressure plasma jet generating device comprising
a housing including a discharge tube, an air inlet, and an outlet, wherein said outlet is formed on a bottom of said discharge tube; said air inlet is interconnected with said discharge tube and said outlet; said discharge tube includes an internal electrode, an external electrode and a first dielectric material; said first dielectric material is annularly disposed between said external electrode and said internal electrode; said internal electrode provides channels inside said discharge tube; an external power source is electrically connected with said internal electrode and said external electrode through cables and provides a high electric field inside said discharge tube; while an external gas flows into said discharge tube via said air inlet, said high electric field inside said discharge tube ionize said external gas to generate atmospheric-pressure plasma; said atmospheric-pressure plasma flows out of said discharge tube through said outlet.

### Claim 2 (depends on 1)

The atmospheric-pressure plasma jet generating device according to claim 1, wherein a first gap exists between said internal electrode and said first dielectric; a second gap exists between said first dielectric and said external electrode.

### Claim 3 (depends on 2)

The atmospheric-pressure plasma jet generating device according to claim 2, wherein a sum of a length of said first gap and a length of said second gap is less than 0.3 mm.

### Claim 4 (depends on 1)

The atmospheric-pressure plasma jet generating device according to claim 1, wherein said external power source is electrically connected with said internal electrode or said external electrode of said discharge tube through cables.

### Claim 5 (depends on 1)

The atmospheric-pressure plasma jet generating device according to claim 1, wherein a cross section of said internal electrode with said channel may have but is not limited to have a shape of a fan, at least one fan, a plurality of V notches, or a plurality of grooves.

### Claim 6 (depends on 1)

The atmospheric-pressure plasma jet generating device according to claim 1, wherein said external gas is selected from a group including air, nitrogen, oxygen, argon, helium, carbon dioxide, and combinations thereof.

### Claim 7 (depends on 1)

The atmospheric-pressure plasma jet generating device according to claim 1, which generates a plasma jet with a temperature of 25-100° C.

### Claim 8 (depends on 1)

The atmospheric-pressure plasma jet generating device according to claim 1, wherein said plasma is inserted under the water surface to form a plasma activated aqueous solution.

### Claim 9 (depends on 1)

The atmospheric-pressure plasma jet generating device according to claim 1, wherein said housing further includes a second dielectric material disposed between a sidewall of said housing and said discharge tube; while said discharge tube is electrically connected with said external power source, said second dielectric material prevents said external power source from discharging electricity to said housing.