Suture techniques and patch materials using an in-vitro model for watertight closure of in-utero spina bifida repair

Area of Science:

• Fetal Surgery
• Biomedical Engineering
• Neurosurgery

Background:

• In-utero spina bifida (SB) repair offers significant benefits but faces challenges like Chiari II malformation and cerebrospinal fluid (CSF) leakage.
• Understanding in-utero CSF pressures is crucial for optimizing surgical techniques and preventing post-operative complications.

Purpose of the Study:

• To determine cerebrospinal fluid (CSF) pressures within the myelomeningocele sac during mid-gestation.
• To develop an in-vitro model for evaluating surgical methods for watertight closure in fetal SB repair.

Main Methods:

• CSF pressures were measured in a mid-gestation in-utero setting.
• An in-vitro chicken thigh model simulated fetal tissue to test watertight closure efficacy.
• Primary closure methods (minimal vs. moderate traction) and patch-based closures (locking vs. non-locking sutures) were evaluated.

Main Results:

• Minimal wound edge traction yielded better seals in primary closures compared to moderate traction.
• The locking suture technique proved superior for watertight closure in patch-based repairs.
• 165 in-vitro experiments were conducted using pre-determined CSF pressures ranging from 6-12.5 cm.

Conclusions:

• Minimal traction is optimal for primary in-utero SB repair closures.
• Locking sutures are recommended for patch-based closures to ensure watertight seals.
• Individualized surgical approaches are essential for enhancing clinical outcomes in fetal spina bifida repair.