Research Progress
High-performance inkjet print head enhances bioprinting productivity
发布时间: 2024-11-18 15:23  点击:134
 Bioprinting is a technology used to create three-dimensional structures, such as human tissues or organs, using bio-inks made of cells and hydrogels. However, conventional inkjet technology has difficulty dispensing bio-inks that are sensitive to temperature due to the heat generated during operation. Furthermore, conventional 3D bioprinting mainly utilizes simple syringe-type printing devices with a single needle, making it time-consuming to produce artificial organs like the brain, lungs, and heart.
The Bionics Research Center team, led by Dr. Byung Chul Lee at the Korea Institute of Science and Technology (KIST), in collaboration with Dr. Seung-Hyup Baek’s team at the Electronic Materials Research Center and Professor Tae-Keun Kim’s team at Korea University, has developed a bio-ink inkjet print head using the piezoelectric material PMN-PZT. This new print head is thinner but performs better than conventional designs. When applied, it enables the simultaneous dispensing of bio-ink at high resolution in multiple positions, significantly improving bioprinting productivity.
The findings have been published in Sensors and Actuators ("A relaxor-ferroelectric PMN-PZT thin-film-based drop-on-demand printhead for bioprinting applications with high piezoelectricity and low heat dissipation").
Schematic of a high-performance piezoelectric material-based print head for bioprinting applications
Schematic of a high-performance piezoelectric material-based print head for bioprinting applications. (Image: Korea Institute of Science and Technology)
The research team developed a multi-nozzle inkjet print head using high-performance PMN-PZT thin films. This technology allows individual control of 16 ink ejection units arranged at 300 μm intervals, resulting in 16 times higher driving efficiency compared to than conventional methods. This enhancement boosts productivity and stability in bioprinting, reducing the production time for artificial organs.
In experiments, the team successfully printed hydrogels, a type of bio-ink, at a diameter of 32μm—half the size of conventional methods. The print speed achieved was 1.2 m/s, approximately 60 times faster than traditional methods. Additionally, the heat generation was reduced by 73.4%, keeping the temperature increase below 3.2 degrees Celsius during printing, ensuring a stable output environment. This allows for precise dispensing of high-viscosity materials and minimizes the deformation of temperature-sensitive bio-inks.
The PMN-PZT-based print head developed in this research can be utilized in organoid fields such as artificial organ transplants and drug toxicity evaluations, where thermal stability has been challenging. Furthermore, the operating temperature remains below 30 degrees Celsius, preventing the deformation of temperature-sensitive electronic materials and providing a stable printing environment. Therefore, it has the potential for broad application in various industries, including electronic components beyond the medical field.
Dr. Lee stated, “The new print head using PMN-PZT thin film material has enhanced the potential for high-resolution 3D organoid model production,” adding, “We plan to commercialize a 3D bioprinter capable of creating organs applicable for transplantation and toxicity evaluation by experimenting with various bio-inks such as gelatin.”


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