Needle electrode-based electromechanical reshaping of rabbit septal cartilage: a systematic evaluation

Area of Science:

• Biomaterials Engineering
• Tissue Engineering
• Electrophysiology

Background:

• Electromechanical reshaping (EMR) utilizes oxidation-reduction reactions to induce cartilage shape change after mechanical deformation.
• Understanding the influence of electrical parameters is crucial for optimizing EMR applications.

Purpose of the Study:

• To investigate the impact of varying voltage and application duration on cartilage reshaping via EMR.
• To determine optimal parameters for achieving significant shape modification in cartilage specimens.

Main Methods:

• Rabbit septal cartilage specimens were mechanically deformed (90-degree bend) and subjected to EMR using a three-needle platinum electrode configuration.
• Constant voltages (1-8 V) were applied for durations of 1, 2, and 4 minutes.
• Numerical modeling guided electrode placement and voltage selection for optimal electric field distribution.

Main Results:

• Cartilage bend angle increased proportionally with both applied voltage and treatment duration.
• Clinically significant reshaping was not observed below a threshold of 4 V for 4 minutes.
• The maximum achieved bend angle was 35.7 ± 1.7 degrees at 8 V for 4 minutes.

Conclusions:

• EMR is a viable method for cartilage reshaping, with outcomes directly correlated to electrical parameters.
• Specific voltage and time thresholds are necessary for effective cartilage modification.
• This study provides key insights into optimizing EMR for potential therapeutic applications in cartilage repair and reconstruction.