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Dialysis catheter having rigid and collapsible lumens and related method
| Details |
Inventors: Palestrant, Aubrey M.;
Assignee:
Primary Examiner: McDermott; Corrine M.
Assistant Examiner:
Attorney, Agent or Firm: Cahill, Sutton & Thomas, P.L.C.
A multiple-lumen catheter includes a first generally-cylindrical flexible lumen extending between a first distal end and a second proximal end; the first lumen is sufficiently rigid to maintain its generally-cylindrical shape when negative pressure is applied thereto for aspirating fluid from the blood vessel. A second flexible lumen also extends between a first distal end and a second proximal end alongside the first lumen. The first distal end of the second lumen is sufficiently pliable to collapse and flatten in the absence of any positive fluid pressure applied to the second lumen; upon the application of a positive fluid pressure to the second lumen, the collapsible first, distal end of the second lumen expands and assumes a generally-cylindrical shape for introducing fluid into the blood vessel. The first collapsible end of the second lumen can extend beyond the-first non-collapsible end of the first lumen for introducing fluid into the blood vessel through the second lumen at a point spaced apart from the first end of the first lumen. In hemodialysis applications, the first lumen is used to aspirate blood, and the second lumen is used to return cleansed blood. |
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DETAILED DESCRIPTION Briefly described, and in accordance with the preferred embodiments disclosed herein, the present invention relates to a multiple lumen catheter for placement into a blood vessel of a patient and including a first flexible lumen having a generally-cylindrical shape extending between opposing first and second ends.
This first lumen, while being flexible, is sufficiently rigid to maintain its generally-cylindrical shape, and resist a collapse, even when negative pressure is applied thereto, as when aspirating fluid from the blood vessel through the first lumen.
The multiple lumen catheter also includes a second flexible lumen secured to the first lumen and extending generally parallel to the first flexible lumen thereto between opposing first and second ends.
Unlike the first lumen, the first end of the second lumen is sufficiently pliable to collapse and flatten in the absence of any positive fluid pressure applied to the second lumen; on the other hand, when a positive fluid pressure is applied to the second end of the second lumen, it is sufficiently pliable to expand and assume a generally-cylindrical shape for introducing fluid into the blood vessel.
The first ends of both the first and second lumens are adapted to extend within the blood vessel of the patient generally proximate to one another, while the second ends of the first and second lumens remain outside the patient's body for exchanging fluids with the blood vessel of the patient.
The second end of the second lumen, which is disposed outside the patient's body, is sufficiently rigid to maintain a generally-cylindrical shape in the absence of any positive fluid pressure applied to the second end of the second lumen.
The second lumen includes a transition region which separates the collapsible first end thereof from the remaining non-collapsible portion of the second lumen; following insertion of the catheter, the transition region extends within the blood vessel of the patient.
The catheter described above can be advantageously used to perform hemodialysis
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Heart Surgery 
