Arterial Wall Penetration Forces in Needles versus Cannulas

Area of Science:

• Dermatology and Aesthetic Medicine
• Medical Device Safety
• Anatomical Research

Background:

• Facial soft-tissue filler injections carry risks of arterial penetration.
• Cannulas are proposed as a safer alternative to needles for filler injections.
• Assessing the safety of different cannulas versus needles is crucial for minimizing vascular complications.

Purpose of the Study:

• To compare the safety of various-sized cannulas against correspondingly sized needles for facial soft-tissue filler application.
• To determine if cannulas offer a reduced risk of facial artery penetration compared to needles.

Main Methods:

• Penetration force testing was conducted on facial and superficial temporal arteries in four fresh frozen cephalic specimens.
• Needles (20-, 22-, 25-, 27-gauge) and cannulas (22-, 25-, 27-gauge) were used in 294 penetration procedures.
• Force required for intraarterial penetration was continuously measured.

Main Results:

• Penetration force decreased significantly with smaller gauge needles and cannulas.
• 22- and 25-gauge cannulas required significantly greater force for arterial penetration compared to needles of the same size.
• No significant difference in penetration force was observed between 27-gauge needles and 27-gauge cannulas.

Conclusions:

• 22- and 25-gauge cannulas are safer than correspondingly sized needles for facial filler injections due to higher penetration force requirements.
• 27-gauge cannulas do not offer a safety advantage over 27-gauge needles in terms of arterial penetration force.
• Cannula size is a critical factor in determining safety during facial filler procedures.