A catheter having a secondary port that enables flushing a fluid from a portion of the catheter. The secondary port is disposed along the length of the catheter tube so as to be near an entry point of the catheter into a patients body. A clamp is disposed adjacent to the secondary port on a side proximate to the patients body. The secondary port and clamp enable flushing of a fluid from a portion of the catheter that is external to the patients body and disposal of a clot- or obstruction-dissolving agent into the external portion of the catheter. Upon removal of the clot or obstruction, the secondary port and clamp enable removal of the dissolving agent and replenishing the fluid in the external portion of the catheter to resume provision of the fluid to the patient.
