Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Reexamination Certificate
1999-04-16
2001-05-08
Nguyen, Anhtuan T. (Department: 3763)
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
C604S164040, C604S170030, C604S174000
Reexamination Certificate
active
06228071
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to cannulae for introduction and withdrawal of fluids to and from a patient. A specific application of the present invention is for the return of oxygenated blood to the patient from a bypass system. The cannula of the present invention is particularly useful as an arterial cannula for cannulating the ascending aorta to return oxygenated blood to the patient for stopped-heart surgical procedures.
Conventional cannulae are generally long, flexible tubes which are draped over the patient when cannulating the ascending aorta. The cannulae can interfere with surgical procedures performed in the chest since the cannula cannot be bent enough to be moved completely out of the surgical field.
It is an object of the invention to provide improved methods and devices for cannulating a patient. In another object of the invention, improved methods and devices for cannulating the ascending aorta are provided.
SUMMARY OF THE INVENTION
The devices and methods of the present invention provide improved devices and methods for cannulating a patient. The cannula has a lumen and proximal and distal portions. The distal portion extends from the proximal portion and terminates at the distal end.
The proximal portion and distal portion are preferably angled relative to one another so that the proximal portion can be moved out of the surgical field and draped over the patient's chest. The distal portion may be angulated relative to the proximal portion in any manner such as a simple curve or bi-linear. The distal portion preferably forms an angle with the proximal portion of 60-150 degrees and the distal portion extends for about 25-35 mm.
When introducing the cannula into a vessel such as the ascending aorta, a stiffening element is introduced into the lumen to straighten the distal portion. After the cannula has been introduced into the patient, the stiffening element is removed permitting the distal portion to angulate relative to the proximal portion for moving the cannula out of the surgical field.
In another aspect of the invention, the stiffening element has an rounded tip which extends beyond the distal end of the cannula to facilitate introduction. The stiffening element also preferably includes an incising element for incising the vessel during introduction. The cannula may also have a stabilizing ring mounted to the distal portion. The stabilizing ring preferably has suture holders and forms an angle of 5-30 degrees with the cannula.
These and other advantages of the invention will become evident from the following description, drawings and claims.
REFERENCES:
patent: 3605725 (1971-09-01), Bentov
patent: 5498251 (1996-03-01), Dalton
patent: 5599300 (1997-02-01), Weaver et al.
Deckman Robert K.
Komtebedde Jan
Moshe Meir H.
Heartport Inc.
Hoekendijk Jens E.
Nguyen Anhtuan T.
Thompson Michael M.
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