Echogenic Needle Sheath for Ultrasound-Guided TAP Block
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Solution Overview
Problem
Conventional abdominal field blocks provide limited analgesic effects and require multiple blind injections, with unpredictable success, whereas transversus abdominis plane (TAP) blocks aim to target spinal nerves but are typically performed blind, lacking precision.
Innovation Solution
An ultrasound-guided TAP procedure using an echogenic needle and sheath, with ultrasound imaging to accurately deposit local anesthetic in the TAP plane, followed by placement of a catheter for controlled anesthetic delivery, enhancing precision and effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If blind injection technique is used for TAP block, then the procedure is simple and quick, but the accuracy and precision of anesthetic placement is poor
Solution Approach 1:
An echogenic needle with indicator features is introduced as an intermediary tool between the practitioner and the TAP plane. The needle includes visual indicators (such as reflective surfaces or colored markers) that are visible through ultrasound imaging, allowing real-time tracking of needle position and orientation without requiring complex imaging systems or multiple needles.
Solution Approach 2:
The needle incorporates visual indicators that create contrast against surrounding tissues during ultrasound imaging. These indicators may include reflective surfaces that appear bright on ultrasound, colored markers visible through the skin, or echogenic materials that enhance visibility, enabling precise visualization of needle trajectory and tip location within the TAP plane.
2Area of stationary object
If multiple blind injections are performed, then the analgesic field coverage may be increased, but the unpredictability and time required increase
Solution Approach 1:
The system provides real-time visual feedback through ultrasound imaging, allowing the practitioner to observe needle penetration, confirm entry into the TAP plane, and verify anesthetic spread. This feedback loop enables single-injection precision by confirming correct placement before injecting, eliminating the need for multiple trial injections and significantly improving predictability of success.
Solution Approach 2:
The echogenic needle indicators add a visual dimension to the injection process, transforming the blind tactile procedure into a visually-guided procedure. By incorporating visual markers on the needle that are detectable through ultrasound, the system enables three-dimensional spatial awareness of needle position and orientation, ensuring accurate anesthetic delivery in a single attempt.
3Measurement precision
If ultrasound guidance is used for TAP block, then the accuracy of anesthetic placement is improved, but the procedure time and complexity increase
Solution Approach 1:
The needle is pre-prepared with echogenic indicators and visual markers before the procedure begins. This preliminary preparation ensures that when ultrasound imaging is initiated, the needle is immediately visible without requiring adjustment or additional setup time. The indicators are permanently attached or integrated into the needle structure, eliminating the need for time-consuming alignment or calibration during the procedure.
4Ease of operation
If blind TAP technique is used, then the ease of operation is high, but the manufacturing precision of anesthetic delivery is poor
Solution Approach 1:
The procedure replaces reliance on tactile sensation and anatomical landmarks (mechanical sense) with visual detection through ultrasound imaging. The echogenic needle indicators provide optical/visual information about needle position, allowing practitioners to maintain the simplicity of blind insertion technique while achieving precision through visual feedback rather than tactile feedback.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The ultrasound-guided TAP procedure improves the accuracy and extent of analgesia, making it suitable for various lower abdominal surgeries by ensuring precise placement of the anesthetic within the TAP plane, thereby enhancing postoperative pain relief.
Implementation Method 1
The needle is an echogenic device in that it is readily 'detected' by the probe during ultrasound imaging
Data Source
AI summary
A procedure and kit are provided for performing an ultrasound-guided transversus abdominis plane (TAP) procedure. The patient's abdomen is scanned with an ultrasound probe to identify and mark the external oblique, internal oblique, and TAP. An introducer sheath is placed over a fluid delivery needle such that the distal end of the needle extends beyond the distal end of the sheath, the needle having echogenic properties for ultrasound imaging. The needle and sheath are ultrasonically guided into the TAP. A local anesthetic or saline/anesthetic combination is injected through the needle to create a liquid pool in the TAP. The needle is removed from the sheath while maintaining the sheath within the TAP and a catheter is subsequently advanced through the sheath and into the pooled liquid in the TAP. The sheath is withdrawn while maintaining the catheter located within the TAP. A catheter is connected to a source of local anesthetic for providing a defined volume of anesthetic to the catheter site at a controlled delivery rate.