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A Water-Resistant, Self-Healing Encapsulation Layer for a Stable, Implantable Wireless Antenna.

Soojung An¹, Hyunsang Lyu¹, Duhwan Seong¹

¹Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea.

|August 26, 2023

Summary

A new self-healing fluoroelastomer (SHFE) provides durable, water-resistant encapsulation for implantable wireless antennas. This material enables stable in vivo communication, protecting devices from biofluids and damage.

Keywords:

encapsulation fluoroelastomer implantable antenna packaging self-healing water-resistant wireless communication

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Area of Science:

Biomedical Engineering
Materials Science
Implantable Devices

Background:

Polymers are crucial for implantable devices in biomedical engineering.
Developing robust encapsulation materials is essential for device longevity and function.

Purpose of the Study:

To introduce a novel water-resistant, self-healing fluoroelastomer (SHFE) for encapsulating implantable antennas.
To evaluate the SHFE's properties and its efficacy in enabling in vivo wireless communication.

Main Methods:

Fabrication of implantable wireless antennas using SHFE encapsulation.
Characterization of SHFE properties: modulus, stretchability, water resistance (WVTR), and underwater self-healing.
In vivo experiments on rodents to assess communication performance and material stability over 4 weeks.

Main Results:

The SHFE demonstrated a tissue-like modulus (~0.4 MPa) and high stretchability (>450%) even after underwater self-healing.
Excellent water resistance (WVTR: 17.8610 g m⁻² day⁻¹) and underwater self-healing via dipole-dipole interactions were confirmed.
Stable wireless communication (15 mm distance) was achieved in vivo for 4 weeks without SHFE deformation.

Conclusions:

The SHFE is a promising encapsulation material for high-performance implantable devices.
Its water resistance, self-healing capabilities, and biocompatibility support long-term in vivo operation.
This work advances the development of reliable implantable wireless communication systems.