Method of placing a cannula
First Claim
1. A method for inserting a cannula in a blood vessel, the method comprising:
- providing a cannula assembly including a cannula, a dilator, a needle and a guide wire, the dilator being telescopically received in a lumen of the cannula and having a passage formed therein, the needle and the guide wire being disposed in the passage of the dilator, the dilator further including a dilator tip being disposed at a distal end and having an opening formed therein;
advancing the cannula assembly with the needle extended through the opening of the dilator tip a predetermined distance through the outer wall of the blood vessel, the needle forming an incision in the blood vessel;
retracting the needle from the dilator tip;
extending the guide wire through the opening of the dilator tip and into the incision;
advancing the dilator and cannula over the guide wire and into the incision; and
removing the dilator, needle and guide wire from the cannula.
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Accused Products
Abstract
A cannula assembly for insertion in a blood vessel includes a cannula and a dilator. The cannula has a proximal end, a distal end, and a lumen extending therebetween. The dilator, which is telescopically received in the lumen of the cannula, includes proximal and distal ends, a passage extending between the proximal and distal ends, and a dilator tip disposed at the distal end. The cannula assembly further includes a needle and a guide wire disposed within the passage of the dilator. The dilator tip has an opening formed therein for receiving one of the needle and guide wire. The dilator tip is configured to limit insertion of the needle in the blood vessel.
208 Citations
20 Claims
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1. A method for inserting a cannula in a blood vessel, the method comprising:
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providing a cannula assembly including a cannula, a dilator, a needle and a guide wire, the dilator being telescopically received in a lumen of the cannula and having a passage formed therein, the needle and the guide wire being disposed in the passage of the dilator, the dilator further including a dilator tip being disposed at a distal end and having an opening formed therein; advancing the cannula assembly with the needle extended through the opening of the dilator tip a predetermined distance through the outer wall of the blood vessel, the needle forming an incision in the blood vessel; retracting the needle from the dilator tip; extending the guide wire through the opening of the dilator tip and into the incision; advancing the dilator and cannula over the guide wire and into the incision; and removing the dilator, needle and guide wire from the cannula. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for inserting a cannula in a blood vessel, the method comprising:
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providing a cannula assembly including a cannula, a dilator, a needle and a guide wire, the dilator being telescopically received in a lumen of the cannula and having a passage formed therein, the needle and the guide wire being disposed in the passage of the dilator, the dilator further including a dilator tip being disposed at a distal end and having an opening formed therein; advancing the cannula assembly with the needle extended through the opening of the dilator tip through the outer wall of the blood vessel; retracting the needle from the dilator tip; extending the guide wire through the opening of the dilator tip and into the blood vessel; advancing the dilator and cannula over the guide wire and into the blood vessel; and removing the dilator, needle and guide wire from the cannula. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification