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A New Venous Entry Detection Method Based on Electrical Bio-impedance Sensing.

Zhuoqi Cheng1, Brian L Davies2,3, Darwin G Caldwell2

  • 1Department of Advanced Robotics, Istituto Italiano di Tecnologia, 16163, Genoa, Italy. zhuoqi.cheng@iit.it.

Annals of Biomedical Engineering
|April 21, 2018
PubMed
Summary
This summary is machine-generated.

A new smart venous entry indicator (SVEI) uses electrical bio-impedance to detect veins, significantly improving peripheral intravenous catheterization (PIVC) success rates, especially for pediatric patients.

Keywords:
Concentric electrode needleElectrical bio-impedanceIn vivo bio-impedance measurementPeripheral intravenous catheterizationVenous entry detection

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Area of Science:

  • Biomedical Engineering
  • Medical Devices
  • Clinical Technology

Background:

  • Peripheral intravenous catheterization (PIVC) is a common medical procedure with a notably low success rate, particularly in pediatric patients.
  • Difficulties in locating veins due to their small size and fragility often necessitate multiple attempts, increasing patient discomfort and risk.
  • Existing methods lack precision in real-time venous entry detection, contributing to procedural inefficiencies.

Purpose of the Study:

  • To develop and evaluate a novel venous entry detection method using electrical bio-impedance.
  • To design and test a clinical device, the smart venous entry indicator (SVEI), incorporating this detection method.
  • To assess the impact of the SVEI on the success rate and efficiency of PIVC procedures.

Main Methods:

  • A concentric electrode needle (CEN) was used to measure electrical bio-impedance of contacting tissues.
  • Experiments were conducted on rat tail veins to determine optimal excitation frequencies for blood detection.
  • A smart venous entry indicator (SVEI) device was developed, utilizing bio-impedance measurements to signal venous entry.
  • A phantom study with naive subjects evaluated PIVC success rates with and without SVEI assistance.

Main Results:

  • Electrical bio-impedance measurement at 100 kHz excitation frequency achieved nearly 100% accuracy in identifying blood.
  • The SVEI demonstrated a significant improvement in PIVC success rates, increasing from 12% with conventional methods to 86% with SVEI assistance.
  • All subjects using SVEI achieved successful catheterization on their first attempt, unlike those using conventional methods.

Conclusions:

  • The proposed bio-impedance-based venous entry detection method is feasible and reliable.
  • The smart venous entry indicator (SVEI) shows great potential to enhance PIVC performance, particularly for non-expert clinicians and in pediatric cases.
  • Further clinical validation is recommended to support the widespread adoption of this technology.