US5685865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low velocity aortic cannula
Assignee: Cleveland Clinic Foundation
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Filing: 1994-10-07
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Granted: 1997-11-11
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Expires: 2014-10-07
Abstract
Abstract A low velocity aortic cannula having a proximal end, a distal end, and a lumen therebetween for conducting blood, the distal end being adapted for insertion into the aorta during heart surgery to provide blood to the aorta. There is a diffuser at least partially blocking the distal end of the cannula, and a plurality of outlet openings in the side of the distal end of the cannula. In one embodiment the distal end of the cannula is closed with a cap, and the diffuser is a rounded cone extending generally upstream in the lumen. The outlet openings are located in the sidewall of the cannula. In a second embodiment of the invention, the diffuser has a helical configuration, and partially blocks the distal opening of the cannula. Additional openings are provided in the sidewall to permit flow. According to the method of this invention, an opening is formed in the aorta, the distal end of one of the embodiments of the cannula is inserted into the opening, and blood flow through the cannula is established.
Inventors
- 👤 Delos M. Cosgrove
- 👤 J. Fredrick Cornhill
- 👤 Christopher M. Boykin
- 👤 Nelson L. Huldin
- 👤 William G. O'Neill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:14
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/0067; A61M25/0068; A61M25/007; A61M1/00; A61M1/36; A61M1/3621; A61M1/3653; A61M1/3659; A61M25/01; A61M25/06; A61M2025/0073; A61M2210/00; A61M2210/12; A61M2210/127
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
127 words
An improved aortic cannula having a sidewall with a proximal end, a distal end, and a lumen therebetween for conducting blood, the distal end being adapted for insertion into the aorta during heart surgery to provide blood to the aorta, the improvement comprising: a cap for blocking axial flow from the distal end of the cannula; a diffuser in the distal end of the lumen for diverting at least part of the flow through the cannula, the diffuser extending generally upstream in the lumen toward the proximal end of the cannula, and tapering in the upstream direction; and at least two outlet openings in the sidewall of the cannula adjacent the diffuser, the outlet openings comprising slots in the sidewall of the cannula, adjacent the distal end.
Claim 2
Dependent Claim
127 words
An improved aortic cannula having a sidewall with a proximal end, a distal end, and a lumen therebetween for conducting blood, the distal end being adapted for insertion into the aorta during heart surgery to provide blood to the aorta, the improvement comprising: a cap for blocking axial flow from the distal end of the cannula; a diffuser in the distal end of the lumen for diverting at least part of the flow through the cannula, the diffuser extending generally upstream in the lumen toward the proximal end of the cannula, and tapering in the upstream direction; and at least two outlet openings in the sidewall of the cannula adjacent the diffuser, the outlet openings comprising slots in the sidewall of the cannula, adjacent the distal end.
Claim 3
Dependent Claim
20 words
The improved aortic cannula according to claim 1 wherein the diffuser has a generally conical shape, with a blunt tip.
Claim 4
Dependent Claim
24 words
The improved aortic cannula according to claim 1 wherein the outlet openings comprise slots in the sidewall of the cannula, adjacent the distal end.
Claim 5
Dependent Claim
17 words
The improved aortic cannula according to claim 3 wherein the proximal ends of the slots are rounded.
Claim 6
Dependent Claim
20 words
The improved aortic cannula according to claim 3 wherein the slots extend proximally beyond the proximal end of the diffuser.
Claim 7
Dependent Claim
17 words
The improved aortic cannula according to claim 3 wherein there are three outlet openings in the sidewall.
Claim 8
Dependent Claim
17 words
The improved aortic cannula according to claim 3 wherein there are four outlet openings in the sidewall.
Claim 9
Dependent Claim
17 words
The improved aortic cannula according to claim 3 wherein there are six outlet openings in the sidewall.
Claim 10
Dependent Claim
31 words
The improved aortic cannula according to claim 1 further comprising a deflector distally below each outlet opening for deflecting at least a portion of the flow from each opening radially outwardly.
Claim 11
Dependent Claim
17 words
The improved aortic cannula according to claim 9 wherein the deflector comprises an indentation in the cap.
Claim 12
Dependent Claim
20 words
The improved aortic cannula according to claim 10 wherein the indentation has the shape of a portion of a sphere.
Claim 13
Dependent Claim
82 words
An aortic cannula for insertion into the aorta during heart surgery to provide blood to the aorta, the cannula comprising a sidewall having a proximal end and a distal end and a lumen therethrough, a cap at the distal end closing the lumen, a diffuser projecting proximally from the cap and tapering in the proximal direction, and outlet openings in the sidewall of the cannula adjacent the diffuser, allowing flow diverted by the diffuser to exit from the sides of the cannula.
Claim 14
Dependent Claim
82 words
An aortic cannula for insertion into the aorta during heart surgery to provide blood to the aorta, the cannula comprising a sidewall having a proximal end and a distal end and a lumen therethrough, a cap at the distal end closing the lumen, a diffuser projecting proximally from the cap and tapering in the proximal direction, and outlet openings in the sidewall of the cannula adjacent the diffuser, allowing flow diverted by the diffuser to exit from the sides of the cannula.
Claim 15
Dependent Claim
17 words
The aortic cannula according to claim 12 wherein the diffuser is generally conical, having a blunt tip.
Claim 16
Dependent Claim
19 words
The aortic cannula according to claim 12 wherein the distal end of the cap has a rounded, hemispherical shape.
Claim 17
Dependent Claim
19 words
The aortic cannula according to claim 12 wherein the distal end of the cap has a rounded, conical shape.
Claim 18
Dependent Claim
19 words
The aortic cannula according to claim 12 wherein the distal end of the cap has a rounded, beveled shape.
Claim 19
Dependent Claim
23 words
The aortic cannula according to claim 12 wherein the outlet openings comprise slots in the sidewall, adjacent the distal end of the cannula.
Claim 20
Dependent Claim
17 words
The improved aortic cannula according to claim 17 wherein the proximal ends of the slots are rounded.
Claim 21
Dependent Claim
21 words
The improved aortic cannula according to claim 17 wherein the slots extend further proximally than the proximal end of the diffuser.
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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) | 2000-11-10 | 2001-05-12 | 2001-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-11-10 | 2005-05-12 | 2005-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-11-10 | 2009-05-12 | 2009-11-11 | $7700.00 | Window Closed / Lapsed |