Double lumen hemodialysis catheter

• US 4,134,402 A
• Filed: 07/05/1977
• Issued: 01/16/1979
• Est. Priority Date: 02/11/1976
• Status: Expired due to Term

• Current Assignee: Sakharam D. Mahurkar
• Original Assignee: Sakharam D. Mahurkar
• Inventors: Mahurkar, Sakharam D.
• Primary Examiner(s): Truluck, Dalton L.
• Application Number:
  US05/812,901
• Time in Patent Office: 560 Days
• Field of Search: 128/214 R, 128/214.4, 128/221, 128/347, 128/348, 128/350 R, 128/DIG. 3
• US Class Current: 604/44
• CPC Class Codes: A61M 2025/0031 characterized by lumina for withdrawing or delivering, i.e. used for extracorporeal circuit treatment
• CPC Class Codes: A61M 2025/0037 characterized by lumina being arranged side-by-side
• CPC Class Codes: A61M 5/1582 Double lumen needles

Abstract

A double lumen continuous flow hemodialysis needle and cannula having contiguous lumens of different lengths, the shorter lumen acting as blood intake lumen and the longer as a blood return lumen, each lumen having a beveled edge sloping outwardly and away from the needle which can be inserted percutaneously and which minimizes the possibility of mixing cleansed blood with blood entering the intake lumen.

Claims

1. A double lumen hemodialysis catheter, comprising a unitary straight tube the periphery of which in transverse cross section defines a single closed plane curve at any point along the entire straight tube, an internal divider extending along a longitudinal portion of said tube and forming said tube into a blood intake lumen and a blood return lumen, one end of said blood return lumen extending beyond the associated end of said blood inlet lumen a distance sufficient to prevent mixing of the returned blood with the blood taken in, the one end of said blood return lumen being beveled with the extending from the lumen periphery opposite said divider and rearward of the distal end toward the distal end and said divider, the associated end of said blood inlet lumen being beveled with the bevel extending from the lumen periphery opposite said divider and rearward of the associated distal end toward the associated distal end and said divider, the distal end of said blood inlet lumen terminating rearward of the juncture of the blood return lumen bevel and the associated lumen periphery each of said lumens defining blood flow paths parallel one to the other along the entire length thereof and at the ends thereof such that blood entering said intake lumen and blood leaving said return lumen enter and exit the associated blood vessel in a direction substantially parallel to the vessel wall.

2. The invention as claimed in claim 1, wherein said blood inlet lumen bevel terminates at said divider rearward of said blood return bevel intersection with said tube periphery.

3. The invention as claimed in claim 1 wherein the end of the blood return lumen extends beyond the end of the blood intake lumen at least one-quarter inch but no greater than three-quarter inch.

4. The invention as claimed in claim 1 wherein the intake lumen is provided with an aperture at its side near its end.

5. A double lumen hemodialysis catheter comprising:

a first blood intake lumen having a blood intake port, a second blood intake lumen rotatably and removably interposed in said first lumen and having a blood intake port, means for rotating said second lumen so as to align said intake ports, a blood return lumen contiguous with said first and second lumens the end of said blood return lumen extending beyond the blood intake port of the first blood intake lumen a sufficient distance to prevent returning blood from re-entering said blood intake ports, said blood return lumen having a beveled end sloping outwardly and away from the catheter, so that the catheter can be inserted by a single puncture for continuous bi-directional blood flow.

6. The invention as claimed in claim 5 wherein the end of the blood return lumen extends between one inch and three inches past the blood intake port of the first blood intake lumen.

7. The invention as claimed in claim 5 further comprising indexing means for aligning said intake ports.