초록 ▼

A limited backflow reflux valve for connection between a syringe, catheter, and bulk container of injection fluid. The reflux valve permits injection of fluid from the syringe through the catheter into the patient, and also permits refilling of the syringe from the bulk container, without disconnect

A limited backflow reflux valve for connection between a syringe, catheter, and bulk container of injection fluid. The reflux valve permits injection of fluid from the syringe through the catheter into the patient, and also permits refilling of the syringe from the bulk container, without disconnection of any tubing. The reflux valve also permits a limited volume of fluid to backflow from the catheter into the syringe, so that the catheter may be checked for patency, but prevents any further backflow along this path after this limited volume. Therefore, the limited backflow reflux valve not only permits injection through the catheter, but also permits both withdrawal of blood from the patient and refilling of the syringe from the bulk contrast media container, without requiring disconnection of the catheter or other tubing and without risk of contamination of the syringe or introduction of air, increasing the efficiency of the injection process, enhancing safety, and reducing waste of injection fluid.

대표청구항 ▼

[ What is claimed is:] [1.] A method of injecting fluid into a patient, comprising the steps of:providing a limited backflow reflux valve comprisinga housing,an inlet port in said housing,an outlet port in said housing,a bi-directional port in said housing,a first check valve permitting fluid flow o

[ What is claimed is:] [1.] A method of injecting fluid into a patient, comprising the steps of:providing a limited backflow reflux valve comprisinga housing,an inlet port in said housing,an outlet port in said housing,a bi-directional port in said housing,a first check valve permitting fluid flow only into said limited backflow reflux valve housing through said inlet port, anda second check valve permitting fluid flow from said limited backflow reflux valve housing through said outlet port, and permitting only a predetermined limited volume of fluid to backflow through said outlet port and into said limited backflow reflux valve housing, and preventing any further backflow through said outlet port into said limited backflow reflux valve housing beyond said limited volume,inserting a catheter into a patient and coupling said catheter to said outlet port,coupling a bulk container of said fluid to said inlet port,coupling a syringe to said bi-directional port,driving a piston in said syringe forwardly to force said fluid from said syringe and into said catheter through said limited backflow reflux valve housing, anddriving said piston in reverse in said syringe to initially extravasate said predetermined limited volume of fluid from said catheter into said limited backflow reflux valve housing, and thereafter draw fluid from said bulk container into said syringe,said driving steps being performed alternately without disconnection or reconnection of said syringe, catheter or bulk container from said limited backflow reflux valve.