Patent CA1150122A successfully refreshed from Google Patents.
CA1150122A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Double-lumen cannula
Assignee: Vas Cath Inc
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Filing: 1980-04-16
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Granted: 1983-07-19
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Expires: 2000-04-16
Abstract
Abstract McCARTHY & McCARTHY C A N A D A ABSTRACT OF THE DISCLOSURE A dual lumen cannula for use in haemodialysis by inserting the cannula into the subclavian vein of a patient to contemporaneously remove blood from the vein for treatment and to return treated blood to the vein downstream from the point of removal. The cannula includes inner and outer lumens and blood is withdrawn through the space between the lumens. Treated blood is returned to the inner lumen. The outer lumen is shaped to have a curvature similar to that of the portion of the vein receiving the cannula and is sufficiently flexible to be straightened during insertion without damage or kinking. The outer lumen has a tapered distal end portion which fits snugly about a part of the inner lumen and defines openings adjacent this end portion to withdraw blood from the vein. Similarly the inner lumen defines openings in a portion outside the outer lumen for returning blood down-stream from the point of removal of the blood. The inner lumen can be withdrawn between haemodialysis treatments leaving only the outer lumen in position and heparinized physiological saline solution can be injected into the outer lumen to prevent blood clotting. If desired, the inner lumen may be left in place between treatments and both inner and outer lumens kept patent with heparinization.
Inventors
- 👤 Geoffrey S. Martin
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-10-23 01:06
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/14; A61M5/158; A61M5/1582; A61M25/00; A61M25/0021; A61M25/0023; A61M25/0026; A61M25/003; A61M2025/0031; A61M2025/0039
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
286 words
A dual lumen cannula for use in haemodialysis by inserting the cannula into the subclavian vein of a patient to contemporaneously remove blood from the vein for treatment and to return treated blood to the vein downstream from the point of removal, the cannula comprising: an elongated tubular outer lumen having a smooth outer surface and being of a material suitable for residing in the subclavian vein and adjacent tissue for extended periods of time, the outer lumen having a residual curvature similar to that of the portion of the vein receiving the cannula and being sufficiently flexible to be straightened during insertion without damage or linking, and defining a tapered distal end portion and openings adjacent this end portion to withdraw blood from the vein; an outer portion coupled to an end opposite said end portion of the outer lumen and including two branches communicating with the outer lumen; an elongated tubular inner lumen adapted to reside essentially inside one of said two branches of the outer portion and inside the outer lumen, the inner and outer lumens and the outer portion being proportioned to permit flow of blood about the inner lumen and through the outer lumen and outer portion, the inner lumen including means for coupling the inner lumen to said one branch of the outer portion to seal the space between this portion and the inner lumen and being proportioned to project outwardly of the tapered end portion of the outer lumen which tapered end portion fits snugly about the inner lumen in sealing engagement therewith, the inner lumen also defining openings outside the outer lumen for returning treated blood to the vein downstream of the aforementioned openings in the outer lumen.
Claim 2
Dependent Claim
286 words
A dual lumen cannula for use in haemodialysis by inserting the cannula into the subclavian vein of a patient to contemporaneously remove blood from the vein for treatment and to return treated blood to the vein downstream from the point of removal, the cannula comprising: an elongated tubular outer lumen having a smooth outer surface and being of a material suitable for residing in the subclavian vein and adjacent tissue for extended periods of time, the outer lumen having a residual curvature similar to that of the portion of the vein receiving the cannula and being sufficiently flexible to be straightened during insertion without damage or linking, and defining a tapered distal end portion and openings adjacent this end portion to withdraw blood from the vein; an outer portion coupled to an end opposite said end portion of the outer lumen and including two branches communicating with the outer lumen; an elongated tubular inner lumen adapted to reside essentially inside one of said two branches of the outer portion and inside the outer lumen, the inner and outer lumens and the outer portion being proportioned to permit flow of blood about the inner lumen and through the outer lumen and outer portion, the inner lumen including means for coupling the inner lumen to said one branch of the outer portion to seal the space between this portion and the inner lumen and being proportioned to project outwardly of the tapered end portion of the outer lumen which tapered end portion fits snugly about the inner lumen in sealing engagement therewith, the inner lumen also defining openings outside the outer lumen for returning treated blood to the vein downstream of the aforementioned openings in the outer lumen.
Claim 3
Dependent Claim
40 words
A dual lumen cannula claimed in claim 1 in which each of the two branches of the outer portion includes a flexible tube capable of being nipped for sealing purposes after removal of the inner cannula and between haemodialysis treatments.
Claim 4
Dependent Claim
279 words
A dual lumen cannula for use in haemodialysis by inserting the cannula into the subclavian vein of a patient -to contemporaneously remove blood from the vein for treatment and to return treated blood to the vein downstream from the point of removal, the cannula comprising; an elongated tubular outer lumen having a smooth outer surface and being of a material suitable for residing in the subclavian vein and adjacent tissue for extended periods of time, the outer lumen having a residual curvature similar to that of the portion of the vein receiving the cannula and being sufficiently flexible to be straightened during insertion without damage or kinking, and defining a tapered distal end portion and openings adjacent this end portion -to withdraw blood from the vein; an outer portion coupled to an end opposite said end portion of the outer lumen and including two branches communicating with the outer lumen; an elongated tubular inner lumen adapted to reside essentially inside one of said two branches of the outer portion and inside the outer lumen, the inner and outer lumens and the outer portion being proportioned to permit flow of blood about the inner lumen and through the outer lumen and outer portion, the inner lumen including means for coupling the inner lumen to said one branch of the outer portion to seal the space between this portion and the inner lumen and being proportioned to fit snugly inside the tapered end portion of the outer lumen in sealing engagement therewith, the inner lumen also defining at least one opening outside the outer lumen for returning treated blood to the vein downstream of the aforementioned openings in the outer lumen.
Claim 5
Dependent Claim
279 words
A dual lumen cannula for use in haemodialysis by inserting the cannula into the subclavian vein of a patient -to contemporaneously remove blood from the vein for treatment and to return treated blood to the vein downstream from the point of removal, the cannula comprising; an elongated tubular outer lumen having a smooth outer surface and being of a material suitable for residing in the subclavian vein and adjacent tissue for extended periods of time, the outer lumen having a residual curvature similar to that of the portion of the vein receiving the cannula and being sufficiently flexible to be straightened during insertion without damage or kinking, and defining a tapered distal end portion and openings adjacent this end portion -to withdraw blood from the vein; an outer portion coupled to an end opposite said end portion of the outer lumen and including two branches communicating with the outer lumen; an elongated tubular inner lumen adapted to reside essentially inside one of said two branches of the outer portion and inside the outer lumen, the inner and outer lumens and the outer portion being proportioned to permit flow of blood about the inner lumen and through the outer lumen and outer portion, the inner lumen including means for coupling the inner lumen to said one branch of the outer portion to seal the space between this portion and the inner lumen and being proportioned to fit snugly inside the tapered end portion of the outer lumen in sealing engagement therewith, the inner lumen also defining at least one opening outside the outer lumen for returning treated blood to the vein downstream of the aforementioned openings in the outer lumen.
References Cited (Backward Citations)
No citation records indexed.
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