| 摘要 |
FIELD: medical equipment. ^ SUBSTANCE: test unit is applied for characterisation of prosthetic cardiac valve for replacement of affected natural cardiac valves. Test unit contains canal connecting vessel with hydropneumatic accumulator. Chamber containing analysed valve is mounted in canal. Lower end of gauge tube is connected to outlet chamber canal, and its upper end to hydropneumatic accumulator. Locking element opens or closes canal outlet to hydropneumatic accumulator. Pneumatic actuator assembly with heart rate controller is connected to hydropneumatic accumulator and provides required pressure. Hydropneumatic accumulator is attached to vessel or measuring tank through drain cup with float and back pressure valves and distribution valve. Vessel, gauge tube and measuring tank are provided with appropriate level indicators. If locking element is open and hydropneumatic accumulator is connected to measuring tank with distribution valve, analysed valve capacity is measured. If locking element is closed and hydropneumatic accumulator is connected to vessel with distribution valve, return crossflow of analysed valve if measured. ^ EFFECT: invention provides approximation of valve test conditions close to living organism environment. ^ 7 cl, 4 dwg |
