DEVICES FOR COLLECTING BLOOD AND ADMINISTERING MEDICAL FLUID

摘要

The present invention relates to devices capable of both collecting blood samples and administering medical fluids to a patient on a repeated and continual basis using one insertion site in a patient's vein. The device passively collects blood utilizing intrinsic venous blood pressure and capillary action, thereby preventing vacuum-induced vein collapse and then facilitates active flow of blood for collecting by extending a syringe plunger. The device typically includes a main tubing segment connected to a cannula for vein insertion and a syringe port and a volumeter for collecting blood branch separately from the main tubing segment. The procedure may be repeated depending on the quantity of blood to be obtained. The device may be used to administer medical fluids to the patient by removing the residual blood from the device by flushing with sterile saline and administering medical fluids through the device.