A self-expanding return cannula for ECMO

The design of the self-expanding reflux cannula solves the problems of blood perfusion resistance and vascular injury in the ECMO system, enabling adaptation to different vascular sizes and blood supply to the distal limb, simplifying the surgical procedure and reducing patient suffering.

CN116271305BActive Publication Date: 2026-02-27BEIHANG UNIV
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Patent Information

Application Number
CN202310118341.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-01-30
Publication Date
2026-02-27
Estimated Expiration
2043-01-30

AI Technical Summary

Technical Problem

In existing ECMO systems, venous-to-arterial cannulation can easily lead to increased blood perfusion resistance, and the vasodilation procedure before cannulation may damage blood vessels. The problem of distal limb ischemia after femoral artery cannulation has not been effectively solved, which increases the complexity of the operation and the patient's suffering.

Method used

Design a self-expanding reflux cannula for ECMO, including an inner lining, an outer lining, and a self-expanding vascular stent. The implanted cannula is kept in a constricted state by a sheath, and it self-expands under blood pressure after implantation. A shunt structure is set up to supply blood to the distal limb, avoiding expansion procedures and bypass perfusion.

Benefits of technology

It enables adaptation to various blood vessel sizes without damaging blood vessels, reduces surgical complexity, solves the problem of distal limb ischemia, provides bidirectional blood supply, and reduces patient suffering.

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Abstract

The application discloses a self-expanding reflux cannula for ECMO and relates to the technical field of medical devices.The self-expanding reflux cannula comprises an implantation tube, a sleeve and a connecting pipe.The implantation tube comprises an inner covering film, an outer covering film and a self-expanding vascular stent.The inner covering film is arranged on the inner wall of the self-expanding vascular stent, and the outer covering film is arranged on the outer wall of the self-expanding vascular stent.The self-expanding vascular stent is in a mesh tube structure and can be radially expanded and contracted.The inner covering film and the outer covering film are both in a tubular shape and can be radially expanded and contracted with the self-expanding vascular stent.The sleeve is arranged on the implantation tube and can be separated from the implantation tube.The sleeve is used for maintaining the implantation tube in a radially contracted state.The one end of the connecting pipe is in communication with one end of the implantation tube, and the other end of the connecting pipe is used for being in communication with an arterial blood outlet of an ECMO system.The implantation tube, the sleeve and the connecting pipe are all flexible tubes.The cannula can be adapted to various blood vessels of different sizes, can avoid causing arterial blood vessel injury due to expansion of the blood vessel and can also supply blood to a distal limb end.
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