| 摘要 |
A cannula that is usable to remove blood from the heart during bypass surgery on a patient where the cannula has a flexible bladder located at or adjacent the location within the heart where the blood is being removed. The flexible bladder forms a closed chamber that communicates through a closed system to a pressure transducer external of the patient such that the pressure within the flexible bladder can be continuously monitored. By monitoring the pressure within the bladder, the user can insure that the pressure within the chamber of the heart does not become negative and thus harmful to the patient. The flexible bladder is partially filled with air and is sufficiently flexible and pliant so as to not be affected by the touching of the inner wall of the heart chamber. |
