甲壳素长纤维增强聚己内酯的制备及重建犬胸壁缺损的实验研究

目的观察可降解性甲壳素长纤维增强聚己内酯(PCL)人工肋条用于犬胸壁缺损重建的作用。方法采用熔融共混、模压法制备甲壳素长纤维增强PCL人工肋条。建立10只10cm×8cm的胸壁缺损犬动物模型,对其中8只犬采用甲壳素长纤维增强PCL人工肋条(实验组)、2只犬采用Marlex网(对照组)进行缺损修复,观察人工胸壁的植入状况及胸壁组织的再生过程,术后1,4和6个月时进行X线摄片、CT扫描检查。结果所有犬无手术死亡和围手术期死亡。实验组2只出现轻度的反常呼吸,2周后反常呼吸消失;无胸壁塌陷、感染,无严重并发症。肋骨断端接触处新生骨增生明显,与人工肋条紧密接触,界面良好,固定牢靠。对照组术后有明显的胸壁塌陷和反常呼吸,网材有皱折发生。结论可降解性甲壳素长纤维增强PCL人工肋条能够对胸壁提供有效的支撑作用。

Experimental study of degradable chitin long fiber reinforced polycaprolactone for reconstruction of chest wall defects

OBJECTIVE: To investigate the application of a novel degradable biomaterial as a chest wall prosthesis and provide valuable scientific basis for clinical application. METHODS: Preparation of chitin long fiber reinforced polycaprolactone (PCL) by means of melt blending and modeling. Full-thickness chest wall defects of 10 cm x 8 cm was created in 10 dogs and then repaired with long chitin fiber reinforced PCL artificial rib in 8 dogs (tested group) and Marlex mesh in 2 dogs (control group). It was dynamically observed that the situation of the implanted chest wall prosthesis and the progress of the regeneration of the chest wall tissue postoperatively. RESULTS: No operative and perioperative deaths were observed in all experimental dogs. In tested group, slight paradoxical respiration occurred in 2 dogs and could not be seen in 2 weeks. No chest wall subsidence and infection occurred. New bone tissue obviously regenerated around both resection ends of the ribs and integrated tightly with artificial ribs. In control group, there were evidently paradoxical respiration and chest wall subsidence. Marlex mesh folded and was enveloped by fibrous tissue. CONCLUSION: Degradable chitin long fiber reinforced PCL can provide effective support to chest walls and is a practicable material for chest wall reconstruction.