Patent US2395109A successfully refreshed from Google Patents.
US5876383A
Expired / Lapsed
US
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Cannula
Assignee: Edwards Lifesciences Corp
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Filing: 1997-09-30
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Granted: 1999-03-02
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Expires: 2017-09-30
Abstract
Abstract An improved aortic cannula is provided for use in heart bypass surgery. The cannula includes an elongated tube with a terminal end. The terminal end has a ramped surface leading to the discharge opening, with a lip extending approximately 70°-90° to the longitudinal axis of the cannula at the bottom of the discharge opening. The curved surface and lip cause the blood to exit the cannula opening in a direction approximately 70°-90° from the longitudinal axis of the cannula, and in a direction toward the ascending aorta. With the improved cannula of the present invention, no blood is directed towards the aortic arch, thereby minimizing the risk of stroke from dislodged plaque commonly found in the aortic arch. The curved surface of the terminal end also reduces the blood flow turbulence, thereby decreasing pressure requirements. The width of the opening allows blood to be discharged in a broadcast band with a radius of approximately 90°.
Inventors
- 👤 Robert K. Grooters
- 👤 Robert J. Todd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:44
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/0067; A61M25/0068; A61M2210/00; A61M2210/12; A61M2210/127; A61M25/0021
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
74 words
An aortic cannula for supplying blood to the aorta during heart surgery, comprising: an elongated tube having a longitudinal axis and a terminal end with an opening therein; a ramped surface adjacent the terminal end to direct the flow of blood from the cannula in a direction approximately 70°-90° to the longitudinal axis, and the terminal end including a substantially flat lip extending from the ramped surface and beyond the perimeter of the tube.
Claim 2
Dependent Claim
74 words
An aortic cannula for supplying blood to the aorta during heart surgery, comprising: an elongated tube having a longitudinal axis and a terminal end with an opening therein; a ramped surface adjacent the terminal end to direct the flow of blood from the cannula in a direction approximately 70°-90° to the longitudinal axis, and the terminal end including a substantially flat lip extending from the ramped surface and beyond the perimeter of the tube.
Claim 3
Dependent Claim
16 words
The cannula of claim 1 wherein the lip extends approximately 70°-90° relative to the longitudinal axis.
Claim 4
Dependent Claim
20 words
The cannula of claim 1 wherein the opening is disposed on the tube to direct blood toward the ascending aorta.
Claim 5
Dependent Claim
21 words
The cannula of claim 1 wherein the opening has a substantial width permitting a fanned broadcast of blood from the opening.
Claim 6
Dependent Claim
20 words
The cannula of claim 1 wherein the terminal end of the tube is angled with respect to the longitudinal axis.
Claim 7
Dependent Claim
22 words
The cannula of claim 5 wherein the angle of the terminal end is approximately 8° to 18° relative to the longitudinal axis.
Claim 8
Dependent Claim
55 words
An improved aortic cannula for supplying blood to the aorta during open heart surgery, comprising: an elongated tube having a longitudinal axis and a terminal end with an opening therein; and wherein the opening having a curved perimeter edge and a substantial width so as to produce a fanned broadcast of blood from the opening.
Claim 9
Dependent Claim
55 words
An improved aortic cannula for supplying blood to the aorta during open heart surgery, comprising: an elongated tube having a longitudinal axis and a terminal end with an opening therein; and wherein the opening having a curved perimeter edge and a substantial width so as to produce a fanned broadcast of blood from the opening.
Claim 10
Dependent Claim
43 words
The cannula of claim 7 further comprising a substantially flat lip on the terminal end adjacent the opening and extending approximately 70°-90° relative to the longitudinal axis to direct blood blow from the cannula in a direction substantially 70°-90° to the longitudinal axis.
Claim 11
Dependent Claim
15 words
The cannula of claim 8 wherein the lip extends beyond the perimeter of the tube.
Claim 12
Dependent Claim
36 words
The cannula of claim 7 further comprising a ramped surface on the terminal end and located upstream from the lip to minimize turbulence of the blood flow as the blood exits the opening of the tube.
Claim 13
Dependent Claim
21 words
The cannula of claim 7 wherein the opening is disposed on the tube to direct blood flow toward the ascending aorta.
Claim 14
Dependent Claim
20 words
The cannula of claim 7 wherein the terminal end of the tube is angled with respect to the longitudinal axis.
Claim 15
Dependent Claim
22 words
The cannula of claim 7 wherein the angle of the terminal end is approximately 8° to 18° relative to the longitudinal axis.
Claim 16
Dependent Claim
14 words
The cannula of claim 1 wherein the opening has a non-planar curved perimeter edge.
Claim 17
Dependent Claim
22 words
The cannula of claim 14 wherein the opening has opposite sides extending approximately 180° with respect to the perimeter of the tube.
Claim 18
Dependent Claim
22 words
The cannula of claim 1 wherein the opening has opposite sides extending approximately 180° with respect to the perimeter of the tube.
Claim 19
Dependent Claim
12 words
The cannula of claim 1 wherein the opening has recessed opposite sides.
Claim 20
Dependent Claim
24 words
The cannula of claim 1 wherein the opening has an upper portion, and the lip extends substantially beyond the upper portion of the opening.
Claim 21
Dependent Claim
22 words
The cannula of claim 7 wherein the opening has opposite sides extending approximately 180° with respect to the perimeter of the tube.
Claim 22
Dependent Claim
12 words
The cannula of claim 7 wherein the opening has recessed opposite sides.
Claim 23
Independent Claim
69 words
A method of minimizing stroke or embolism in a patient during open heart surgery, comprising: making an opening in the aorta; inserting a cannula through the opening, the cannula having a terminal end with an opening therein through which blood is discharged; orienting the cannula opening so as to be directed toward the ascending aorta, thereby precluding blood flow from the cannula in a direction toward the aortic arch.
Claim 24
Independent Claim
69 words
A method of minimizing stroke or embolism in a patient during open heart surgery, comprising: making an opening in the aorta; inserting a cannula through the opening, the cannula having a terminal end with an opening therein through which blood is discharged; orienting the cannula opening so as to be directed toward the ascending aorta, thereby precluding blood flow from the cannula in a direction toward the aortic arch.
Claim 25
Dependent Claim
26 words
The method of claim 21 further comprising directing the blood out of the cannula in a direction approximately 70°-90° from the longitudinal axis of the cannula.
Claim 26
Dependent Claim
38 words
The method of claim 21 wherein the blood is directed along a ramped surface adjacent the opening at the terminal end of the cannula, the ramped surface changing the blood flow path approximately 70°-90° from the longitudinal axis.
Claim 27
Dependent Claim
25 words
The method of claim 21 wherein the blood is directed along a lip adjacent the opening and extending approximately 70°-90° relative to the longitudinal axis.
Claim 28
Dependent Claim
19 words
The method of claim 21 wherein the blood is broadcast from the opening in a radius of approximately 90°.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-03-01 | 2002-08-31 | 2003-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-01 | 2006-08-31 | 2007-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-01 | 2010-08-31 | 2011-03-02 | $7700.00 | Window Closed / Lapsed |