Studies on spinal braces. With special reference to the effects of increased abdominal pressure.

Strong pressure exerted upon the abdomen by a fabric corset for a long period might cause abnormal increase in the intraabdominal pressure. This may possibly result in disturbance of the viscera. Therefore, we measured changes in the intraabdominal pressure and the pressures in the abdominal aorta, vena cava and portal vein. We also examined the histological changes in the liver in normal adult dogs wearing a fabric corset for a long time. We found that the pressure in the abdominal aorta remains almost constant, although the intraabdominal pressure and the pressures of vena cava and portal vein were increased. This may indicate the presence of congestion. Histological findings in the liver tissue of dogs suggest the presence of some abnormality. We have developed a dynamic and functional "Wakayama Medical College" type of spinal brace as a result of these findings.