Possible to activate inside and backside of the target porous materials

Carrier gas-filled type new structured atmospheric plasma system (*)

Advantage

  • Available in dry process treatment, avoiding chemical treatment
  • Proven hydrophilic treatment on PLA scaffold for bone regeneration
  • Short processing times of a few seconds to a few minutes
  • To be demonstrated for a wide range of processing materials (HA, β-TCP, PI, PP, PET, PTFE)

Background and Technology

Modification and cleaning technologies for porous materials are required to obtain solderability and to modify affinity surfaces for bonding and adhesion with other materials. For such needs, there are various technologies such as UV or plasma treatment process. Among these, atmospheric pressure plasma irradiation process is characterized by its simplicity and high speed. But existing process enabled us to treat only outermost surface of porous materials and it was extremely hard to treat interior of the materials. As for the hydrophilic treatment, there is a method of NaOH solution immersion, but it has disadvantages such as several hours of treatment time, the need for rinsing time and degradation of mechanical strength after treatment.

This device is equipped with a space made of an enclosure material (glass, alumina, zirconia, etc.) filled with 99% or more carrier gas (He, Ar etc.) to accommodate the processing material, electrodes to generate plasma, and a plasma propagation path (left photo). The plasma is irradiated from the outside of the processing chamber, but it can pass through the walls of the camber like a tunnel, propagating the inside. This device can activate the interior and the backside of the porous materials in a short time.

After implantation of the bone regeneration scaffold, it takes a long time for the regenerated bone to cover and stabilize the scaffold, because the scaffold has a hydrophobic surface, which makes it difficult for blood to penetrate and gain affinity with bone cells.

A PLA bone regeneration scaffold fabricated by a 3D printer was treated in the atmospheric pressure He carrier gas-filled space of this system for 5 min. Hydrophilic modification of the inner surface of the scaffold was confirmed by the fact that water was permeated in 0.8 s from the surface opposite the plasma irradiation.

It is expected to be applicable not only to the medical field, but also to other industrial needs that are difficult to meet with existing methods, such as the need to modify the flow of thermally conductive fluids into porous materials for heat management, and affinity surface treatment.

  ()Once the air in the chamber is exhausted, it is filled with the carrier gas

Patent

JP2019-155512

Applicant

University Public Corporation Osaka

Expectations

We are looking for partner companies that are interested in commercialization of this equipment or the evaluation and development of products and applications using this technology.

Product No. ON-03922b

Published

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