MEDICAL INSTRUMENT FOR MEASURING FLUID PRESSURE

摘要

A medical instrument for measuring fluid pressure interposable in any of a variety of intravascular infusion apparatus. The instrument includes a body having a through passage, a closed chamber and capillary tube forming a pressure gauge, a valve chamber including a vent and a valve member in the valve chamber. With one end of the through passage connected to the patient and the other end of the through passage connected to a source of fluid the valve member may be manipulated to permit infusion of the fluid, to block infusion and allow a return flow of fluid from the patient while venting the through passage, capillary tube and closed chamber, and to block infusion and allow a return flow of fluid from the patient into the valve chamber and capillary tube while blocking the vent so that the pressure of the return flow of fluid may be measured.