Claims
- 1. A system for performing extracorporeal blood treatment, said system comprising:an arterial cannula including a tubular body adapted to be implanted within an arterial lumen and a tubular access leg having a first end connected to a junction on the tubular body, wherein blood flowing through a lumen of the tubular body can selectively flow out through the access leg; and a venous cannula implantable within a venous lumen and including an access leg to selectively permit blood return to the venous lumen.
- 2. A system as in claim 1, further comprising an arterial port adapted to be connected to a second end of the access leg of the arterial cannula and to receive percutaneous attachment of an arterial catheter.
- 3. A system as in claim 2, further comprising a venous port adapted to be connected to an end of the access leg of the venous cannula.
- 4. A system as in claim 3, wherein the venous cannula consists essentially of the access leg and is adapted to be planted freely within the venous lumen.
- 5. A system as in claim 1, wherein the tubular body has a length in the range from 10 mm to 50 mm and an outer diameter in the range from 3 mm to 10 mm.
- 6. A system as in claim 5, wherein the access leg has a length in the range from 25 mm to 700 mm and an outer diameter in the range from 3 mm to 10 mm.
- 7. A system as in claim 1, wherein at least a portion of the access leg is sufficiently compliant so that no substantial forces may be transmitted to the tubular body through the access leg.
- 8. A system as in claim 7, wherein at least a portion of the access leg adjacent to the tubular body has a bending stiffness which is less than that of the adjacent tubular body.
- 9. A system as in claim 8, wherein said portion of the access leg has a hoop strength sufficient to withstand an internal pressure of −250 mmHg.
- 10. A system as in claim 1, wherein the tubular body is circumferentially reinforced.
- 11. A system as in claim 10, wherein the circumferential reinforcement comprises a helical wire or circumferential corrugation.
- 12. A system as in claim 1, wherein the access leg is circumferentially reinforced.
- 13. A system as in claim 12, wherein the circumferential reinforcement comprises a helical wire or circumferential corrugation.
- 14. A system as in claim 1, further comprising a pressure-responsive valve at the junction, said valve inhibiting blood flow across the junction in the absence of a pressure differential thereacross.
- 15. A system as in claim 14, wherein the valve is incorporated in the tubular body so that no structure of the valve intrudes into the vascular lumen.
- 16. A system as in claim 15, wherein the valve is a slit valve formed in the tubular body at the junction.
CROSS-REFERENCES TO RELATED APPLICATIONS
The present application is a continuation of application Ser. No. 08/724,948, filed Oct. 2, 1996, which is a continuation-in-part of application Ser. No. 08/539,105, filed on Oct. 4, 1995 now U.S. Pat. No. 5,807,356, which was a continuation-in-part of application Ser. No. 08/183,151, filed on Jan. 18, 1994 now U.S. Pat. No. 5,562,617, the full disclosures of which are incorporated herein by reference.
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Foreign Referenced Citations (3)
Number |
Date |
Country |
0 228 532 |
Jul 1987 |
EP |
2616667 |
Jun 1987 |
FR |
61-52710 |
Nov 1986 |
JP |
Non-Patent Literature Citations (2)
Entry |
Wigness, B.D., “Bidirectional Implantable Vascular Access Modality,” Trans. Amer.Ssoc.for Art. Int. Organs., Chicago, Illinois; (Apr. 1982) 28:54-57. |
Implantofix: Drug Delivery System, Bethlehem, Pennsylvania, 1-13. |
Continuations (1)
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Number |
Date |
Country |
Parent |
08/724948 |
Oct 1996 |
US |
Child |
09/472593 |
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US |
Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
08/539105 |
Oct 1995 |
US |
Child |
08/724948 |
|
US |
Parent |
08/183151 |
Jan 1994 |
US |
Child |
08/539105 |
|
US |