Cannula with removable sleeve

• US 20070260218A1
• Filed: 05/05/2006
• Published: 11/08/2007
• Est. Priority Date: 05/05/2006
• Status: Active Grant

• Current Assignee: Children's Hospital & Medical Center
• Original Assignee: Children's Hospital & Medical Center
• Inventors: Eghtesady, Pirooz
• Granted Patent: US 8,529,514 B2
• Time in Patent Office: Days
• US Class Current: 604/510
• CPC Class Codes: A61M 2025/0681 Systems with catheter and outer tubing, e.g. sheath, sleeve or guide tube
• CPC Class Codes: A61M 25/0041 pre-formed, e.g. specially adapted to fit with the anatomy of body channels urethral catheters A61F2/04
• CPC Class Codes: A61M 25/007 Side holes, e.g. their profiles or arrangements; Provisions to keep side holes unblocked
• CPC Class Codes: A61M 25/0662 Guide tubes

Abstract

A venous cannula is disclosed having an insertion hole near the distal end and a leading end hole at the distal end. The cannula further includes a removable sleeve that is fitted within the insertion hole and preferably extends at least from the insertion hole to the leading end hole. In a preferred embodiment, the cannula also includes an introducer that fits within the removable sleeve and extends at least the length of the removable sleeve. The removable sleeve and introducer are designed to facilitate use of the Seldinger technique with the venous cannula. Additionally, a method for use of the Seldinger technique with the cannula is disclosed.

Claims

1. A cannula comprising:

an elongated tubular body having a leading end and a proximal end, the tubular body having a first opening at the leading end and a second opening at the proximal end, and the tubular body having a third opening distal from the leading end; and

a removable tubular sleeve extending at least the length from the third opening to the first opening, the removable sleeve having an open proximal end and an open leading end;

the removable tubular sleeve being one of substantially straight and slightly angled so as to facilitate guidance of the removable tubular sleeve along a guidewire;

the first and third opening being spaced from each other by at most 6.35 centimeters.

2. A cannula of claim 1 wherein at least a portion of the leading end of the removable sleeve extends beyond the first body opening when the removable sleeve is fully inserted into the third body opening.

3. A cannula of claim 1 wherein the diameter of the opening on the leading end of the sleeve is smaller than the diameter of the first body opening.

4. A cannula of claim 2 wherein the leading end of the removable sleeve that extends beyond the first body opening is smaller in diameter than the first body opening.

5. A cannula of claim 1 wherein the diameter of the removable sleeve at the first body opening is greater than diameter of the removable sleeve at the open leading end.

6. A cannula of claim 1 wherein the cannula further comprises a tubular introducer fitted through the removable sleeve at the third body opening.

7. A cannula of claim 6 wherein the introducer has an introducer proximal end nearest the open proximal end of the removable sleeve and an introducer leading end nearest the open leading end of the removable sleeve, at least a portion of the leading end of the introducer extends out of the open leading end of the removable sleeve when fully inserted into the removable sleeve at the third body opening.

8. A cannula of claim 7 wherein the introducer has a substantially tapered leading end.

9. A cannula of claim 7 wherein the portion of the leading end of the introducer that extends out of the leading end of the removable sleeve is smaller in diameter than the opening at the leading end of the removable sleeve.

10. A cannula of claim 7 wherein a portion of the proximal end of the introducer extends out of the open proximal end of the removable sleeve.

11. A cannula of claim 10 wherein the portion of the proximal end of the introducer that extends out of the third body opening is larger in diameter than the third body opening.

12. A cannula of claim 1 wherein the tubular body is angled about a heel.

13. A cannula of claim 12 wherein the third body opening is located at the heel.

14. A cannula of claim 12 wherein the proximal end is angled away from the leading end to approximately form a right angle.

15. The cannula of claim 12 wherein the first opening and the third opening lie substantially along the same axis.

16. A cannula of claim 1 wherein the third body opening can extend from the tubular body of a substantially straight cannula.

17. A cannula of claim 1 wherein additional openings are present between the first body opening and third body opening.

18. A cannula of claim 1 wherein the removable sleeve has an annular shoulder at the proximal end that is shaped to abut and encircle the third body opening.

19. A cannula of claim 1 wherein the first and third openings are spaced from each other at a distance no less than 0.5 cm and no more than 4.5 cm.

20. A method of introducing a cannula into a vessel, comprising the steps of:

(a) providing a cannula comprising an elongated tubular body having a leading end and a proximal end, the tubular body having a first opening at the leading end and a second opening at the proximal end, and the tubular body having a third opening distal from the leading end; and

a removable tubular sleeve extending at least the length from the third opening to the first opening, the removable sleeve having an open proximal end and an open leading end;

the removable tubular sleeve being one of substantially straight and slightly angled so as to facilitate guidance of the removable tubular sleeve along a guidewire;

the first and third opening being spaced from each other by at most 6.35 centimeters;

(b) providing an opening into a vessel and using a suture to maintain the opening;

(c) inserting a needle into the vessel at the opening, the needle having a shaft that extends the entirety of the needle;

the needle being open at both the top of the shaft and bottom of the shaft;

(d) threading one end of a guidewire through the needle and into the vessel;

(e) removing the needle over the guidewire;

(f) threading the other end of guidewire through the removable sleeve and leading end of the cannula body from the opening at the leading end of the sleeve through the opening at the proximal end of the sleeve;

(g) moving the leading end of the cannula body and removable sleeve down the length of the guidewire to a position abutting the opening of the vessel;

(h) inserting a portion of the leading end of the cannula body and a least a portion of the leading end of the removable sleeve into the vessel;

(i) removing the removable sleeve from the leading end of the cannula body.

21. The method of claim 20 further including the step of tightening the suture about the cannula body prior to removing the removable sleeve from the leading end of the cannula body.

22. The method of claim 20 further including the step of tightening the suture about the cannula body following the removal of the removable sleeve from the leading end of the cannula body.

23. The method of claim 20 further including the step of positioning the entirety of the leading end of the cannula body within the vessel.

24. The method of claim 20 wherein the cannula also comprises an introducer, the introducer is fitted through the removable sleeve at the third opening of the tubular body, and the introducer is removed from the leading end of the cannula body at approximately the same time as the removable sleeve.

25. The method of claim 20 further includes the step of dilating the opening of the vessel following removal of the needle from the guidewire and prior to introduction of the cannula.

26. The method of claim 25 wherein the vessel is dilated by a portion of the removable sleeve.

27. The method of claim 25 wherein the vessel is dilated by a portion of an introducer.