Replication of microstructures on three-dimensional geometries by injection moulding of liquid silicone rubber

Yang Zhang, Michael Mischkot, Hans Nørgaard Hansen, Poul-Erik Hansen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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Abstract

In this paper, liquid silicon rubber (LSR) parts with micro pillars are studied. The LSR parts were produced by injection moulding and are used as anchoring device for electrode implants inside humans. Micro-structures with specific dimension on implant surfaces can reduce encapsulation by the human body, thereby improving implant performance. This paper presents a method of applying micro structure on 3D parts. A Ni-plate with micro holes on the surface was cut into inserts and stuck in a cavity for injection moulding. 1000 injection moulding cycles were performed. Key dimensions of the pillars were monitored at intervals of the production on LSR parts on different locations. This paper focuses on characterization methods for the dimensions of the pillars on LSR parts. Due to the transparency and elasticity of LSR material, conventional stylus or optical instruments cannot be used to measure the height of the pillars. A confocal microscope with infinite focus was used instead. Moreover, SEM was employed to illustrate the topography visually. It is believed that the uniformity of the height of the pillar array is critical for proliferation of human cells, hence the standard deviation of the height was studied with the aid of SPIP®. The replication degree of LSR pillars is calculated based on the height measurement. The injection moulding process is also discussed in this paper.
Original languageEnglish
Title of host publicationProceedings of the 15th International Conference on Metrology and Properties of Engineering Surfaces, ASPE
Number of pages8
PublisherAmerican Society for Precision Engineering
Publication date2015
Publication statusPublished - 2015
Event15th International Conference on Metrology and Properties of Engineering Surfaces - University of North Carolina, Charlotte, NC, United States
Duration: 2 Mar 20155 Mar 2015
Conference number: 15

Conference

Conference15th International Conference on Metrology and Properties of Engineering Surfaces
Number15
LocationUniversity of North Carolina
Country/TerritoryUnited States
CityCharlotte, NC
Period02/03/201505/03/2015

Keywords

  • Micro-structure
  • Liquid silicon rubber
  • Injection moulding

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