Self-sealing cannula

• US 10,695,483 B2
• Filed: 11/11/2015
• Issued: 06/30/2020
• Est. Priority Date: 11/14/2014
• Status: Active Grant

• Current Assignee: University of Maryland Baltimore County (University of Maryland)
• Original Assignee: University of Maryland Baltimore County (University of Maryland)
• Inventors: Wu, Zhongjun, Griffith, Bartley P., Rajagopal, Keshava
• Primary Examiner(s): Deak, Leslie R
• Application Number:
  US15/526,107
• Publication Number:
  US 20170303958A1
• Time in Patent Office: 1,693 Days
• CPC Class Codes: A61B 17/3417 Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating syringe needles A61M5/32; dilators A61M29/00
• CPC Class Codes: A61B 17/3421 Cannulas
• CPC Class Codes: A61B 17/3439 with means for changing the inner diameter of the cannula, e.g. expandable A61B17/3423, A61B17/3431 take precedence; catheters A61M25/0662
• CPC Class Codes: A61B 2017/00247 Making holes in the wall of the heart, e.g. laser Myocardial revascularization
• CPC Class Codes: A61B 2017/3419 Sealing means between cannula and body
• CPC Class Codes: A61B 2017/3425 for internal organs, e.g. heart ports
• CPC Class Codes: A61M 1/3659 Cannulae pertaining to extracorporeal circulation
• CPC Class Codes: A61M 60/109 incorporated within extracorporeal blood circuits or systems
• CPC Class Codes: A61M 60/117 for assisting the heart, e.g. transcutaneous or external ventricular assist devices
• CPC Class Codes: A61M 60/148 in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
• CPC Class Codes: A61M 60/178 drawing blood from a ventricle and returning the blood to the arterial system via a cannula external to the ventricle, e.g. left or right ventricular assist devices
• CPC Class Codes: A61M 60/216 including a rotating member acting on the blood, e.g. impeller
• CPC Class Codes: A61M 60/253 including a displacement member directly acting on the blood
• CPC Class Codes: A61M 60/38 Blood oxygenation
• CPC Class Codes: A61M 60/857 Implantable blood tubes
• CPC Class Codes: A61M 60/861 Connections or anchorings for connecting or anchoring pumps or pumping devices to parts of the patient's body
• CPC Class Codes: A61M 60/865 Devices for guiding or inserting pumps or pumping devices into the patient's body

Abstract

The present invention discloses a self-sealing cannula that through a self-sealing mechanism fixed on the ventricular wall or atrial wall, the cannula body is attached to the self-sealing fixture and blood is drawn into the lumen via an external pump and returned to the circulation system through a separate cannula; in the case of the double lumen cannula embodiment, the blood will be drawn into the drainage lumen of the double lumen cannula and returned through an infusion lumen at the desired location.

Claims

1. A self-sealing cannula system, comprising:

a first cannula having a distal end and a proximal end; and

a flexible, self-sealing closure attached to said first cannula approximately at said distal end of said first cannula, said closure comprising a hollow, elongate structure defining an open interior, wherein said first cannula is removably attached to said interior of said closure, and wherein said closure is configured to automatically seal upon removal of said first cannula from said closure;

wherein said self-sealing closure is expandable from a compressed state, in which an outer wall of said closure defines an elongate, hollow cylinder, into an uncompressed state, in which an outer wall of said closure defines an upper disc, a lower disc, and a generally cylindrical wall extending between said upper disc and said lower disc; and

wherein said hollow cylinder further comprises a first connecting member on an interior of said hollow cylinder, and said first cannula further comprises a second connecting member on an exterior of said first cannula configured for removable attachment to said first connecting member.

2. The self-sealing cannula system of claim 1, further comprising a removable sheath encasing said closure and at least a portion of said first cannula, said removable sheath compressing said closure into said compressed state, and wherein said closure is further configured to automatically expand from said compressed state to said uncompressed state upon removal of said sheath within a patient'"'"'s body.

3. The self-sealing cannula system of claim 2, wherein said closure is temperature-responsive and further configured to expand from said compressed state to said uncompressed state in response to a patient'"'"'s body temperature.

4. The self-sealing cannula system of claim 1, wherein said first connecting member and said second connecting member comprise a mating threaded connection.

5. The self-sealing cannula system of claim 1, wherein said closure further comprises a distal end and a proximal end, and said integrally-formed self-sealing shutter further comprises a self-closing iris at said closure proximal end.

6. The self-sealing cannula system of claim 5, wherein said iris is configured to automatically close said closure proximal end upon removal of said first cannula from said closure.

7. The self-sealing cannula system of claim 1, further comprising:

a second cannula positioned within said first cannula and extendable from said distal end of said first cannula.

8. The self-sealing cannula system of claim 7, said second cannula having a distal end formed of an expandable wire frame.

9. The self-sealing cannula system of claim 8, wherein said expandable wire frame of said second cannula is temperature responsive and configured to expand in response to a patient'"'"'s body temperature.

10. The self-sealing cannula system of claim 7, further comprising a blood pump attached to said first cannula, and a blood oxygenator attached to said second cannula.

11. The self-sealing cannula system of claim 1, wherein said closure is formed of temperature responsive wire mesh.

12. The self-sealing cannula system of claim 11, wherein said wire mesh further comprises a superelastic Nitinol alloy.

13. The self-sealing cannula system of claim 1, wherein said closure further comprises a self-sealing shutter integrally affixed to a bottom end of said generally cylindrical wall of said closure.

14. A self-sealing cannula system, comprising:

a first cannula having a distal end and a proximal end;

a flexible, self-sealing closure attached to said first cannula approximately at said distal end of said first cannula, said closure comprising a hollow, elongate structure defining an open interior, wherein said first cannula is removably attached to said interior of said closure, and wherein said closure is configured to automatically seal upon removal of said first cannula from said closure; and

a second cannula positioned within said first cannula and extendable from said distal end of said first cannula, said second cannula having a distal end formed of an expandable wire frame.