Instantaneous Piezoelectric Nanogenerator for Pacemaker Applications.

Area of Science:

• Biomedical Engineering
• Materials Science
• Energy Harvesting

Background:

• Implantable nanogenerators (NGs) offer a path to self-sustainable power for cardiovascular implantable electronic devices (CIEDs).
• Low conversion efficiency of mechanical energy to electrical energy has hindered practical application of NGs for charging power storage.

Purpose of the Study:

• To develop an enhanced piezoelectric nanogenerator (i-PENG) design to overcome the efficiency limitations of conventional PENGs.
• To demonstrate the i-PENG's capability to rapidly charge a power storage component for biomedical applications.

Main Methods:

• Designed an instantaneous piezoelectric nanogenerator (i-PENG) to amplify output spikes from a regular PENG.
• Integrated the i-PENG with a rectifier and micro capacitor to create a self-contained power system.
• Tested the integrated system's performance by implanting it on a pig's heart surface.

Main Results:

• The i-PENG design achieved approximately 7 times higher output amplitude compared to a regular PENG.
• The enhanced electrical energy output resulted in a substantially faster capacitor charging rate.
• The integrated system charged a 100 μF capacitor to 4 V in 13 minutes on a pig's heart.

Conclusions:

• The i-PENG design principle effectively increases piezoelectric energy output for powering implantable biomedical devices.
• The developed system successfully operated a commercial pacemaker, demonstrating its practical viability.
• This work paves the way for self-powered implantable devices using enhanced piezoelectric energy harvesting.