Fluid delivery systems, devices, and methods for delivery of hazardous fluids
A catheter including an outer conduit and an inner conduit positioned within the outer conduit, the inner conduit having a smaller diameter that that of the outer conduit. A volume between the outer conduit and the inner conduit define a first lumen which may deliver a first fluid to a patient, and an inside diameter of the inner conduit defines a second lumen which may deliver a second fluid to the patient such that the fluid flow of the first fluid and the second fluid exiting the catheter has a flow profile where the first fluid surrounds the second fluid and the second fluid is prevented from contact with inner walls of a blood vessel of the patient in a vicinity of a tip of the catheter.
1. A catheter, comprising:
an outer conduit; and
an inner conduit positioned within the outer conduit and having a diameter smaller than a diameter of the outer conduit,
wherein a volume between the outer conduit and the inner conduit define a first lumen adapted to deliver a first fluid to a patient, and an inside diameter of the inner conduit define a second lumen adapted to deliver a second fluid to the patient such that a fluid flow of the first fluid and the second fluid exiting the catheter has a flow profile where the first fluid surrounds the second fluid and the second fluid is prevented from contact with inner walls of a blood vessel of the patient in a vicinity of a tip of the catheter,
wherein the first fluid is saline and the second fluid is a hazardous pharmaceutical.
2. The catheter of claim 1 , wherein the inner conduit ends rearward of the outer conduit.
3. The catheter of claim 1 , wherein the second fluid is an antitumor chemotherapy pharmaceutical.
4. A method for delivering a hazardous pharmaceutical comprising:
providing a catheter comprising an outer conduit, and an inner conduit positioned within the outer conduit and having a diameter smaller than a diameter of the outer conduit, wherein a volume between the outer conduit and the inner conduit define a first lumen adapted to deliver a first fluid to a patient, and an inside diameter of the inner conduit define a second lumen adapted to deliver a second fluid to the patient;
flowing the first fluid through the first lumen; and
after a predetermined time, flowing the second fluid through the second lumen,
wherein the fluid flow of the first fluid and the second fluid exiting the catheter has a flow profile where the first fluid surrounds the second fluid such that the second fluid is prevented from contact with inner walls of a blood vessel of the patient in a vicinity of a tip of the catheter.
5. The method of claim 4 , wherein the first fluid is saline and the second fluid is a hazardous pharmaceutical.
6. The method of claim 4 , further comprising reducing a flow rate of the first fluid by an amount equal to a flow rate of the second fluid at the predetermined time, such that a flow rate of the fluid exiting the catheter remains constant.
7. The method of claim 6 , further comprising reducing the flow rate of the second fluid to zero after sufficient amount of the second fluid has been administered; and increasing the flow rate of the first fluid so that the flow rate of the fluid exiting the catheter remains constant.
8. The method of claim 4 , wherein delivery of the second fluid is continuous until all of the second fluid is delivered.
9. The method of claim 4 , wherein delivery of the second fluid is periodic and separated by delivery of only the first fluid between pulses of the second fluid.