# Acoustic Field Enabled Polymeric Nanoparticle Deposition onto Vessel Walls for Enhanced Drug Delivery

## TL;DR

This paper explores using sound waves to guide drug-carrying nanoparticles to specific areas of blood vessels, improving targeted drug delivery.

## Contribution

The novel use of low-frequency acoustic fields to enhance nanoparticle deposition on vessel walls, independent of nanoparticle surface chemistry.

## Key findings

- Acoustic fields increased nanoparticle fluorescence on vascular tissue by 1000-fold at a flow rate of 2 m/min.
- NP deposition was independent of NP surface chemistry.
- A 100-fold increase in fluorescence was observed in ex vivo human vessel walls with localized acoustic fields.

## Abstract

Polymeric nanoparticles
(NPs) are promising tools for transporting
and localizing therapeutics with intravenous delivery. Targeting these
vehicles to specific tissue sites is challenging. Here, we investigate
the use of low-frequency acoustic fields to drive polymeric NPs from
circulating blood onto blood vessel walls by using concepts of elastic
material deformation. By varying the shear flow rate and duration
of acoustic field exposure, we achieved a 1000-fold increase in NP
fluorescence intensity on vascular tissue compared with no acoustic
field at a flow rate of 2 m/min. Interestingly, we found that acoustic-field-enhanced
NP deposition is independent of NP surface chemistry. We also showcase
a 100-fold increase in the area of fluorescence detected following
NP delivery to an intact, ex vivo human vessel wall
when a localized acoustic field is applied. This work suggests that
local administration of acoustic fields can control polymeric NP biodistribution
after intravenous delivery and enhance the treatment of tissue-specific
pathologies.