INTRO

• Peripheral nerve block catheters have unacceptably high failure rates, preventing clinical adoption.

• Secondary dislocation is a key problem and needs to be addressed for future nerve block catheter designs.

ANALYSIS

• Secondary dislocation is caused by

• Lack of internal fixation near target

• External fixation on skin

• Forces acting on the catheter on the path from insertion site (skin) to target near nerve

• Tissue movement, including muscle contraction, tissue swelling and other factors

• Different anatomic regions have specific characteristics of forces and dislocation distances

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POTENTIAL SOLUTIONS

• Internal fixation mechanism

• Mechanical

• Chemical

• Combination

• Sufficient anchoring force to prevent secondary dislocation

• Safe

CONCLUSION

• Peripheral nerve block catheters need to be redesigned to solve the problem of secondary dislocation