The goal of this project is to develop an implantable micro-transponder for measurement of interstitial fluid pressure (IFP) in solid tumors. IFP is an important clinical parameter indicating the accessibility of many solid tumors to therapeutic agents. This is in light of the fact that higher levels of IFP in tumors impede the efficient delivery of drugs. In addition to chemotherapy, radiation therapy can also benefit from lowering the IFP by increasing the oxygen partial pressure in hypoxic tumor regions. The ability to measure IFP using an implantable micro-transponder would provide valuable data for evaluating various pharmacological agents used to lower the IFP. In addition, by measuring the IFP, one can tailor the administration of IFP lowering drugs to optimize their efficacy (e.g., administration of the chemotherapeutic agent when the IFP is reduced). During the course of the proposed research we will develop a micro-transponder for wireless measurement of IFP inside solid tumors. The micro-device consists of a capacitive pressure sensor with an integrated Guyton capsule connected to an inductor, thus forming a parallel LC circuit whose resonant frequency is a measure of interstitial pressure. The LC resonator is packaged inside a glass tube (1.5mm in diameter and 1cm in length) with the Guyton capsule side exposed to the tissue. The presence of Guyton capsule allows accurate measurements of IFP following the implantation since interstitial fluid can easily ingress into the device.

Public Health Relevance

The objective of this proposal is to develop an implantable micro-transponder for measurement of interstitial fluid pressure (IFP) in solid tumors. High levels of IFP impede the effective delivery of drugs to many tumors. The ability to measure IFP using an implantable micro-transponder would provide valuable data for evaluating various pharmacological agents and tailoring the administration of IFP lowering drugs to optimize their efficacy.

Agency
National Institute of Health (NIH)
Institute
National Institute of Biomedical Imaging and Bioengineering (NIBIB)
Type
Exploratory/Developmental Grants (R21)
Project #
5R21EB013486-02
Application #
8399010
Study Section
Bioengineering, Technology and Surgical Sciences Study Section (BTSS)
Program Officer
Korte, Brenda
Project Start
2011-12-15
Project End
2014-11-30
Budget Start
2012-12-01
Budget End
2014-11-30
Support Year
2
Fiscal Year
2013
Total Cost
$175,767
Indirect Cost
$34,567
Name
Purdue University
Department
Engineering (All Types)
Type
Schools of Engineering
DUNS #
072051394
City
West Lafayette
State
IN
Country
United States
Zip Code
47907