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Ann Thorac Surg 1997;63:1730-1736
© 1997 The Society of Thoracic Surgeons

Original Article: Cardiovascular

Silicone-Coated Polypropylene Hollow-Fiber Oxygenator: Experimental Evaluation and Preliminary Clinical Use

Takatsugu Shimono, MD, Yu Shomura, MD, Iwao Hioki, MD, Akira Shimamoto, MD, Hironori Tenpaku, MD, Yasumi Maze, MD, Koji Onoda, MD, Motoshi Takao, MD, Hideto Shimpo, MD, Isao Yada, MD

Department of Thoracic and Cardiovascular Surgery, Mie University School of Medicine, Tsu, Japan

Accepted for publication December 24, 1996.

Background. A membrane oxygenator consisting of a microporous polypropylene hollow fiber with a 0.2-µm ultrathin silicone layer (cyclosiloxane) was developed. Animal experimental and preliminary clinical studies evaluated its reliability in bypass procedures.

Methods. Five 24-hour venoarterial bypass periods were conducted on dogs using the oxygenator (group A). In 5 controls, bypass periods were conducted using the same oxygenator without silicone coating (group B). As a preliminary clinical study, 14 patients underwent cardiopulmonary bypass with the silicone-coated oxygenator.

Results. Eight to 16 hours (mean, 12.2 hours) after initiation of bypass, plasma leakage occurred in all group B animals, but none in group A. The O2 and CO2 transfer rates after 24 hours in group A were significantly higher than at termination of bypass in group B (p < 0.005 and p < 0.03, respectively). Scanning electron microscopy of silicone-coated fibers after 24 hours of bypass revealed no damage to the silicone coating of the polypropylene hollow fibers. In the clinical study, the oxygenator showed good gas transfer, acceptable pressure loss, low hemolysis, and good durability.

Conclusions. This oxygenator is more durable and offers greater gas transfer capabilities than the previous generation of oxygenators.




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 Ann. Thorac. Surg.Home page
A. Shimamoto, S. Kanemitsu, K. Fujinaga, M. Takao, K. Onoda, T. Shimono, K. Tanaka, H. Shimpo, and I. Yada
Biocompatibility of silicone-coated oxygenator in cardiopulmonary bypass
Ann. Thorac. Surg., January 1, 2000; 69(1): 115 - 120.
[Abstract] [Full Text] [PDF]

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 Ann. Thorac. Surg.Home page
H. Watanabe, J.-i. Hayashi, H. Ohzeki, H. Moro, M. Sugawara, and S. Eguchi
Biocompatibility of a silicone-coated polypropylene hollow fiber oxygenator in an in vitro model
Ann. Thorac. Surg., May 1, 1999; 67(5): 1315 - 1319.
[Abstract] [Full Text] [PDF]


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