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

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.