Method of plasma treatment of an internal and/or external surface of a hollow electrically non-conductive body and a device for carrying out this method
Field: Medical | Plasma technologies
The invention is a method for plasma treatment of the internal and/or external surface of a hollow electrically non-conductive bodies (made of, for example, glass, ceramics or polymeric materials) in order to obtain the desired surface properties for their end use (e.g. hydrophilicity or hydrophobicity, biocompatibility, antimicrobial properties, and the like).
The essence of the invention is a method and a device for such a treatment offered by the use of electric plasma generated at atmospheric pressure. By this the long hollow electrically non-conducting bodies can be treated evenly and easily by the plasma treatment on their inner and outer surfaces, thereby adjusting their surface properties.
The device for plasma treatment of the external and internal surfaces of an electrically non-conductive hollow body can be used mainly in production processes where it is often necessary to modify the properties of surfaces of products (e.g. hoses, tubes, bottles, containers, cuvettes, fibers and capillaries, catheters and similar hollow instruments and aids used in medicine such as blood bags and similar containers for medical use) in order to obtain the desired surface properties for their end use (e.g., hydrophilicity or hydrophobicity, biocompatibility, antimicrobial properties, electrical conductivity, surface permeability for gases and liquids, sorption properties, adhesion).
For these mentioned surface treatments, so-called "wet methods" are typically currently used. Through the use of liquid solvents and aggressive acidic and alkaline solutions, it is possible to achieve, for example, the cleaning and etching of surfaces, biological decontamination, surface activation, the creation of chemical groups, covering a surface with thin layers of other materials, and surface immobilization of nanoparticles.
The present method provides such treatment without the disadvantages associated with the use of heavy chemistry (e.g., hazardous handling, toxic waste), namely by using electrical plasma generated at atmospheric pressure from a surface of a liquid. The advantage of using an electrically conductive liquid is that it does not corrode and erode the electrodes. Plasma surface treatment is fast and homogeneous.
IP protection status
Patent of the Czech Republic, USA, and Singapore. The European patent is validated in Germany, France, the United Kingdom of Great Britain and Northern Ireland, Ireland, Italy, and Switzerland.