Valve for use with a catheter or the like

摘要: A miniature valve for use with a catheter or the like in which cylindrical body is made up of male member and female telescoped together so as to define opposed annular seats surrounding through-opening. disc rubber having central domed portion containing an axial slit mounted between seats, members being detented that periphery pinched thereby displacing radially inwardly keep normally sealed against flow either direction. The has leur type connection adjacent underside dome top dome. spaced respect when cooperating connector inserted into tip engages open permit straight through through-opening In injecting fluids withdrawal therefrom using catheter, it frequently desirable provide can be opened closed at will. Such should capable working reliably liquids gases. typical usage may employed seal air pumped cuff endotracheal tube. another permanently secured intravenous needle left place patient permits subsequent series additions withdrawals upon attachment standard syringe leur-type taper, re-closing positively withdrawn. common such purpose so-called "Roberts" outer shell internal seat, piston movable therein, spring bias piston, sealing ring seat. When unseated flow, fluid must make two sharp 90° turns traversing valve. blood turbulence induced by tends cause precipitation clotting not only affects quality but increases risk clogging malfunction valve; example, fail reseal itself cutting off flow. It object present invention highly reliable operation all types fluids, both liquid gaseous, provides free bends, minimizing turbulence. therefore ideally suited control causes sedimentation clotting, reduces level passageways. extremely simple construction consisting three parts, telescoping soft captured them. related easily assembled requiring pressing predetermined condition achieve permanent assembly pre-stress while guarding any overstressing thereof. manufactured economically without adherence close tolerances nonetheless on universal basis medical fittings type. yet which, although assembled, cannot disassembled tamper proof. sterile many times desired, even venous usage, impairing its integrity. this precludes leakage from incident opening closing preventing escape fluid, particularly tend form dried accumulation interferes conventional valves. Indeed, valve, minor limited film surface automatically dislodged flexing next time operated.