With the advance in plastic surgery, tubed pedicle has extensively been used to make up defects of tissue, and in the field of otorhinolaryngology, it is also utilized in various plastic surgeries.
The present studies were undertaken to know whether it was possible to make a narrow and long tubed pedicle, which was necessary to build up the external ear of the microtia. For this purpose, circulation in the tubed pedicle was investigated clinically, and also experimentally by using tubed pedicle in the back of the rabbit.
1) A photoelectric blood flow met er was made to determine both the pulse wave which was principally arterial, and the absolute blood amount in the tubed pedicle.
2) Results obtained with the photoelectric blood flow meter and with skin thermometer were compared each other, and close correlation was observed between them.
3) Macroscopical changes, length-width ratio and the direct ion of blood flow by ligature of tubes were examined in clinical cases.
4) Establishment of circulation after making tubed pedicle in the back of the rabbit was investigated with the photoelectric blood flow meter and the following results was obtained At the next day after making the tubed pedicle, the pulse wave could be recorded from the majority of the cases, but the direction of blood flow was not discernible; thereafter the direction became gradually clear, and after 6 days, it was distinct.
5) The blood vessel and the surround ing tissue were observed in rabbits from immediately after making tubed pedicles, and it was found that there was no qualitative difference in cross section of the tube between the both ends and middle part, but there was quantitat ive difference, that is, healing process was retarded in the middle as compared with the both ends. Edema and cellular infiltration predominated from 3 to 5 days, capillary proliferation and increase in fibroblasts which came on from the 5th day, were visible as late as about 12 days, and on the 14th day, normal tissue was nearly restored except for degeneration in some parts. The time thereafter is considered optimal for transplantation.
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