CANNULA FOR CONNECTING MEDICAL DEVICES TO BIOLOGICAL SYSTEMS

• US 20170036006A1
• Filed: 04/10/2015
• Published: 02/09/2017
• Est. Priority Date: 04/10/2014
• Status: Active Grant

• Current Assignee: University Health Network
• Original Assignee: University Health Network
• Inventors: Harrison, Daniel Gavin, Frost, Geoffrey Samuel, Waddell, Thomas Kenneth, Wyvill, Laura Ann, Keshavjee, Shafique, Yang, Randy, Cracauer, Raymond Francis, Cypel, Marcelo
• Granted Patent: US 11,045,633 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A01N 1/0247 for perfusion, i.e. for circulating fluid through organs, blood vessels or other living parts
• CPC Class Codes: A61M 2039/0258 for vascular access, e.g. blood stream access
• CPC Class Codes: A61M 2039/0261 Means for anchoring port to the body, or ports having a special shape or being made of a specific material to allow easy implantation/integration in the body
• CPC Class Codes: A61M 2039/0264 with multiple inlets or multiple outlets
• CPC Class Codes: A61M 2039/0273 for introducing catheters into the body
• CPC Class Codes: A61M 2039/0276 for introducing or removing fluids into or out of the body
• CPC Class Codes: A61M 39/0247 Semi-permanent or permanent transcutaneous or percutaneous access sites to the inside of the body peritoneal dialysis catheters A61M1/285; tracheostomy devices A61M16/0465; measuring pressure within the body A61B5/03; colostomy devices A61F5/445; gastrotomy feeding tubes A61J15/0015; means for fixing a feeding tube outside of the body A61J15/0053

Abstract

A cannula for connecting a medical device to a biological system is taught. The cannula includes a tissue engagement portion, preferably in the form of an annulus, to which a vacuum is applied through the cannula to attract and hold tissue of the biological system in an initial connection while an affixment device is applied to complete the connection. In addition to a working fluid conduit, comprising a main port, a working fluid passage and a working fluid port, and a port to apply the vacuum, the cannula can include a sensor port to allow sensing pressure or other characteristics of the working fluid at a point closely adjacent to the connection between the cannula and the biological system.

Claims

1. A cannula for connecting a medical device to a biological system, comprising:

a body including a main port for a working fluid, a working fluid port, and a conduit extending through the body between the working fluid port and the main port;

the body further including a tissue engagement portion encircling the working fluid and

the body further including vacuum port, at least one vacuum outlet at the tissue engagement portion, and at least one vacuum passage extending through the body between the at least one vacuum outlet and the vacuum port,

2. The cannula of claim 1, the tissue engagement portion further comprising a groove about the exterior of the body the groove including the at least one vacuum outlet,

3. The cannula of claim 2 wherein the groove includes a plurality of vacuum outlets in fluid communication with the vacuum port via a plurality of vacuum passages,

4. The cannula of claim 1, the body further including a sensing port, a sample port adjacent the working fluid port, and a sensing passage extending through the body between the sensing port and the sample port.

5. The cannula of claim 1, further comprising a solid state sensor located adjacent the working fluid port.

6. The cannula of claim 5 wherein the solid state sensor is a pressure sensor.

7. The cannula of claim 1, the body further including stand offs adjacent the working fluid port to inhibit direct contact between the working fluid port and a biological system to which the cannula is connected.

8. The cannula of claim 7 wherein the stand offs are in the form of upstanding flutes.

9. The cannula of claim 7 wherein the stand offs are in the form of cage about the working fluid port.

10. The cannula of claim 1 wherein the cross section of the body presented to the biological system is circular.

11. The cannula of claim 1, wherein the cross section of the body presented to the biological system is one of ellipsoidal and irregular.

12. The cannula of claim 1 wherein the body is formed by injection molding.

13. The cannula of claim 1 wherein the body is formed by 3D printing.

14. The cannula of claim 1, the conduit including a chamber adjacent to the working fluid port.

15. The cannula of claim 14, wherein the chamber is conical.

20. A method of connecting a cannula according to claim 1 to a biological system, comprising:

placing biological tissue over the at least one vacuum outlet of the tissue engagement portion;

applying a vacuum to the vacuum port;

applying an affixment device about the tissue engagement portion to affix the biological tissue to the tissue engagement portion; and

removing the vacuum from the vacuum port.

16. A cannula kit to connect medical device to a biological system, the comprising:

a cannula having;

a body including a main port for a working fluid, a working fluid port, and a conduit extending through the body between the working fluid port and the main port;

the body further including a tissue engagement portion encircling the working fluid port;

the body further including a vacuum port, at least one vacuum outlet at the tissue engagement portion, and at least one vacuum age extending through the body between the at least one vacuum outlet and the vacuum port; and

an affixment device to encircle tissue of a biological system at the tissue engagement portion and to maintain the tissue engaged therewith.

17. The kit of claim 16 wherein the affixment device is a surgical suture.

18. The kit of claim 16 wherein the affixment device is a resilient O-ring.

19. The kit of claim 16 wherein the affixment device is a cable tie.