| 摘要 |
A catheter pulse device is disclosed which is activated by vacuum signals and which is used adjacent to or directly attached to a catheter for withdrawing fluids from a patient's body cavity, such as the stomach. The device operates immediately following the normal cessation of suction in an intermittent suction system and returns a minute quantity of the withdraw fluid back into the catheter itself to clear the withdrawal passageways. The pulse device provides protection against an excess of vacuum from reaching the patients cavity by utilizing a specially designed valve that opens and closes the path between a source of regulated vacuum and the patient. That valve is balanced such that it initially opens at or approximately at the point the vacuum on the patient side of the valve reaches the regulated vacuum set by the doctor or other knowledgeable personnel, and thus the vacuum to the patient does not exceed a set amount. The pulse device can therefore be used in a system where the device itself is located directly on or adjacent the catheter itself, thus eliminating long distensible passageways between the pulse device and the patient and thereby minimizing the detrimental reservoir effect of such long passageways. |
