Optically Guided Epidural Needle Placement Using 405-nm Wavelength for Accurate Puncture

Area of Science:

• Anesthesiology
• Medical Devices
• Biomedical Engineering

Background:

• The loss of resistance (LOR) method is the standard for epidural anesthesia but has limitations.
• Accurate needle placement is crucial for effective and safe epidural anesthesia.
• Existing methods for locating the epidural space can be challenging for operators.

Purpose of the Study:

• To evaluate the efficacy of a novel optical auxiliary device for guiding needle placement into the epidural space.
• To compare the success rate of epidural space identification using the optical auxiliary versus traditional methods.
• To assess the optical signal changes during needle insertion through different tissue layers.

Main Methods:

• The study involved 60 lumbar punctures in 20 porcine models.
• An optical auxiliary device was used to monitor signal changes during needle insertion.
• Needle tip position was confirmed using C-arm fluoroscopy.
• Optical signal strengths from the ligamentum flavum and epidural space were recorded and analyzed.

Main Results:

• A significant decrease in optical signal strength was observed upon entering the epidural space (67% reduction).
• Signal strength in the ligamentum flavum was 1.38 ± 0.57, and in the epidural space was 0.46 ± 0.35.
• The optical auxiliary guided needle placement achieved an 87% success rate in locating the epidural space.
• No significant differences in signal strength decrease were found across lumbar segments L2-L3, L3-L4, and L4-L5.

Conclusions:

• The optical auxiliary provides real-time visual feedback, enabling accurate and efficient needle insertion into the epidural space.
• This technology has the potential to enhance the safety and effectiveness of epidural anesthesia.
• The distinct optical signal changes aid in precise identification of tissue layers during needle navigation.