Development of cost-effective biocompatible packaging for microelectronic devices.

Area of Science:

• Biocompatible Materials Science
• Medical Device Engineering
• Implantable Device Technology

Background:

• Developing safe and effective implantable medical devices requires robust packaging solutions.
• Current packaging methods face challenges with biocompatibility and long-term stability in physiological environments.
• Preventing metal ion leaching from device components is critical for patient safety.

Purpose of the Study:

• To propose a cost-effective, miniaturized, and biocompatible packaging method for implantable medical devices.
• To explore barrier materials and fabrication processes for individual die encapsulation.
• To ensure the long-term integrity and safety of implantable devices.

Main Methods:

• Investigated various common cleanroom materials for die encapsulation.
• Conducted accelerated aging tests using bio-fluid at elevated temperatures.
• Evaluated noble metals, specifically platinum (Pt), for electrode metallization.
• Performed calculations for cost-effectiveness of selective plating versus sputtering.

Main Results:

• Several common cleanroom materials demonstrated effectiveness in preventing metal leaching.
• Some conductive barrier materials degraded in bio-fluid under accelerated testing, indicating insufficient long-term resistance.
• Noble metals, particularly Pt, were identified as superior candidates for electrode covering.
• Selective plating of Pt was found to be more cost-effective than sputtering, with Pt recycling being crucial for sputter process cost reduction.

Conclusions:

• A novel, small, soft, and comfortable implantable package is achievable through explored methods.
• Noble metal coatings are essential for ensuring the long-term resistance of electrodes to body fluids.
• Optimized fabrication processes, including selective plating and material recycling, enhance cost-effectiveness for implantable device packaging.