RESUMEN
Objective To observe the response of the guiding vane to axial flow pump by testing two types of miniature axial flow pump,which have been developed by our group in recent years.Methods Two types of axial flow pump were tested in a mock circulation apparatus.Results The outputs of the two types of miniature axial flow pump all attain 5L/min against the pressure of 13.332kPa,which is enough for left ventricular assistance.The outputs are similarly related to their pre-load and after-load pressure.In this study,the guiding vane does not produce a significant affection on the hydrodynamic characteristic of the axial follow pump.Conclusion The guiding vane may be neglected in the design to improve the blood compatibility of a axial flow pump heart assist device.
RESUMEN
Objective To explore the feasibility of Lugol's iodine staining in association with P53 oncoprotein test to detect early esophageal cancer and precancerous lesions through endoscopy. Methods Lugol's iodine was sprayed on esophageal mucosa under endoscopy in 78 patients with suspected early malignancy. Severe dysplasia which taken from unstained position by iodine were prepared immunohistochemically for P53 oncoprotein study. Then endoscopic mucosal resection (EMR) was performed to these severe dysplasia with P53 oncoprotein－ positive mucosa. Results There were 31 unstained areas (25 patients) including squamous cell carcinomas (n=3) and severe dysplasias (n=16). Expression of P53 was found in 7 severe dysplasia (43.8％ ),and 1 carcinoma in situ was found by EMR. Conclusion This modified method seemed feasible not only to detect early esophageal cancer,but also to resect severe dysplasia mucosa selectively by EMR.