Surgery Today

, Volume 43, Issue 11, pp 1298–1304 | Cite as

A newly designed bioabsorbable substitute for the treatment of diaphragmatic defects

  • Masayasu Aikawa
  • Mitsuo Miyazawa
  • Kojun Okamoto
  • Yasuko Toshimitsu
  • Katsuya Okada
  • Naoe Akimoto
  • Yosuke Ueno
  • Isamu Koyama
  • Yoshito Ikada
Original Article



Earlier studies have investigated the suitability of various materials and autologous grafts for the repair of diaphragmatic defects. Our group investigated the feasibility of using an artificial diaphragm (AD) to repair wide diaphragmatic defects.


Twelve pigs were laparotomized and, in each pig, a defect was fashioned by resecting a round 8-cm diameter hole in the left diaphragm. Next, the defect was repaired by implanting an AD. The animals were relaparotomized 8 or 24 weeks after implantation for gross, histological and radiological observation of the implanted sites.


All recipient animals survived until killing for evaluation. Chest X-ray examinations showed no differences between the preoperative diaphragms and the grafted diaphragms at 8 and 24 weeks after implantation. At 8 weeks after implantation, the implanted sites exhibited fibrous adhesions to the liver and lungs without deformities or penetrations. Parts of the surface tissue at the graft sites had a varnished appearance similar to those of the native diaphragm. Histology performed at 8 weeks detected no trace of the ADs in the graft sites; however, numerous inflammatory cells and profuse fibrous connective tissue were observed. At 24 weeks after implantation, no differences were found in the thorax between the areas with the grafts and the unaffected areas. Histology of the graft sites in the thorax confirmed growth of mesothelial cells similar to that observed in the native diaphragm.


Artificial diaphragms can be a novel substitute for diaphragmatic repair.


Diaphragmatic reconstruction Diaphragmatic defect Bioabsorbable polymer Congenital diaphragmatic hernia Diaphragmatic invasion Post-traumatic diaphragmatic hernia 


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Copyright information

© Springer Japan 2012

Authors and Affiliations

  • Masayasu Aikawa
    • 1
  • Mitsuo Miyazawa
    • 1
  • Kojun Okamoto
    • 1
  • Yasuko Toshimitsu
    • 1
  • Katsuya Okada
    • 1
  • Naoe Akimoto
    • 1
  • Yosuke Ueno
    • 1
  • Isamu Koyama
    • 1
  • Yoshito Ikada
    • 2
  1. 1.Department of Surgery, Gastrointestinal CenterSaitama Medical University International Medical CenterHidakaJapan
  2. 2.Division of Life ScienceNara Medical UniversityNaraJapan

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