A Surgical Needle Probe for Electrical Impedance Measurements

C03375: Tissue Sensing Needle

Novelty:

An insertion tool that integrates a sensor to detect differences between tissue-type differences during placement.

Value Proposition:

Laparoscopic procedures have become commonplace in many surgical fields, as they are less invasive and reduce recovery times. However, these benefits come at the cost of visualization of the tools, especially during insertion. While imaging techniques can be used to confirm placement, they cannot always be used for real-time inspection. For experienced surgeons, tactile feedback may provide some indication on what tissue is being pierced, but this is not available in most robotic surgical systems. This technology provides a means for tissue-type feedback during needle insertion, through a sensor. Other advantages include:

Technical Details:

Johns Hopkins researchers have developed an electrical impedance probe constructed within a surgical needle. The probe consists of a two-part trocar needle designed to acquire impedance measurements at its point. Since the impedance of cells varies by cell type, the new probe may be used to confirm needle position in a desired anatomical target or to identify the nature of cells surrounding the tip of the needle

Looking for Partners:

To develop and commercialize the technology as a new means to confirm tool placement during laparoscopic and robotic surgical procedures.

Stage of Development:

Prototype

Data Availability:

Depth versus Impedance plots for porcine kidney insertions

Publications/Associated Cases:

Journal of Urology. October 2001; Vol 166: 1520–1523.