Patent US5616137A successfully refreshed from Google Patents.
US5616137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low velocity aortic cannula
Assignee: Michigan Critical Care Consultants Inc
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Filing: 1995-02-22
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Granted: 1997-04-01
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Expires: 2015-02-22
Abstract
Abstract An aortic cannula having a distal end adapted to be inserted into the aorta to deliver fluid to the aorta has a flexible tip with a plurality of helical slits that widen and narrow in response to the pressure in the cannula, widening in response to an increase in pressure to reduce exit velocity of the fluid.
Inventors
- 👤 Erin J. Lindsay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:16
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/0067; A61M25/0068; A61M25/007; A61M25/01; A61M25/06; A61M2025/0073
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
81 words
An improved aortic cannula having a sidewall with a proximal end and a distal end and a lumen therebetween for conducting fluid, the distal end adapted to be inserted into the aorta to deliver fluid to the aorta, the improvement comprising a plurality of helical slits through the sidewall of the distal end of the cannula that widen and narrow proportionally in response to pressure inside the cannula, widening in response to an increase in pressure to reduce fluid exit velocity.
Claim 2
Dependent Claim
81 words
An improved aortic cannula having a sidewall with a proximal end and a distal end and a lumen therebetween for conducting fluid, the distal end adapted to be inserted into the aorta to deliver fluid to the aorta, the improvement comprising a plurality of helical slits through the sidewall of the distal end of the cannula that widen and narrow proportionally in response to pressure inside the cannula, widening in response to an increase in pressure to reduce fluid exit velocity.
Claim 3
Dependent Claim
22 words
The improved aortic cannula according to claim 1 wherein the slits are oriented at an angle with respect to the radial direction.
Claim 4
Dependent Claim
32 words
The improved cannula according to claim 2 wherein the slits are oriented in the opposite direction as the helical turn of the slits, when viewed from the proximal to the distal direction.
Claim 5
Dependent Claim
14 words
The improved aortic cannula according to claim 2 wherein the helical slits turn clockwise.
Claim 6
Dependent Claim
22 words
The improved aortic cannula according to claim 4 wherein the slits are oriented at an angle with respect to the axial direction.
Claim 7
Dependent Claim
25 words
The improved cannula according to claim 5 wherein the slits are oriented in a counter-clockwise direction, when viewed from the proximal to the distal direction.
Claim 8
Dependent Claim
22 words
The improved aortic cannula according to claim 1 wherein the slits are oriented at an angle with respect to the axial direction.
Claim 9
Dependent Claim
22 words
The improved aortic cannula according to claim 1 wherein the slits extend generally outwardly and distally through the wall of the cannula.
Claim 10
Dependent Claim
15 words
The improved aortic cannula according to claim 1 wherein there are at least three slits.
Claim 11
Dependent Claim
20 words
The improved aortic cannula according to claim 1 wherein there is an opening through the distal end of the cannula.
Claim 12
Dependent Claim
23 words
The improved aortic cannula according to claim 10, wherein the opening through the distal end of the cannula widens in the distal direction.
Claim 13
Dependent Claim
27 words
The improved aortic cannula according to claim 1 where there is a diffuser inside the lumen for diverting at least a portion of the flow radially outwardly.
Claim 14
Dependent Claim
14 words
The improved aortic cannula according to claim 12 wherein the diffuser is generally conical.
Claim 15
Dependent Claim
27 words
The improved aortic cannula according to claim 13 wherein there is an opening through the distal end of the cannula, extending generally axially through the conical diffuser.
Claim 16
Dependent Claim
20 words
The improved aortic cannula according to claim 14 wherein the opening in the distal end widens in the distal direction.
Claim 17
Dependent Claim
107 words
An aortic cannula having a sidewall with a proximal end and a distal end and a lumen therebetween for conducting fluid, the distal end adapted to be inserted into an aorta to deliver fluid to the aorta, the distal end being closed, except for a plurality of helical slits in the sidewall that widen proportionally to the fluid pressure in the lumen to allow fluid to flow outwardly therethrough, when the pressure inside the lumen is greater than that surrounding the distal end, and which close to block flow into the lumen when the pressure inside the lumen is not greater than that surrounding the distal end.
Claim 18
Dependent Claim
107 words
An aortic cannula having a sidewall with a proximal end and a distal end and a lumen therebetween for conducting fluid, the distal end adapted to be inserted into an aorta to deliver fluid to the aorta, the distal end being closed, except for a plurality of helical slits in the sidewall that widen proportionally to the fluid pressure in the lumen to allow fluid to flow outwardly therethrough, when the pressure inside the lumen is greater than that surrounding the distal end, and which close to block flow into the lumen when the pressure inside the lumen is not greater than that surrounding the distal end.
Claim 19
Independent Claim
109 words
A method of delivering fluid to the aorta of a patient comprising the steps of: making a slit in the aorta of the patient; inserting the distal end of a cannula into the aorta through the slit, the cannula having a plurality of helical slits through the sidewall of the distal end of the cannula, circumferentially spaced around the distal end of the cannula; delivering fluid to the cannula sufficient to cause the distal end of the cannula to turn oppositely from the direction of the helical slits, thereby widening the slots to permit the liquid to flow from the distal end of the cannula through the widened slits.
Claim 20
Independent Claim
109 words
A method of delivering fluid to the aorta of a patient comprising the steps of: making a slit in the aorta of the patient; inserting the distal end of a cannula into the aorta through the slit, the cannula having a plurality of helical slits through the sidewall of the distal end of the cannula, circumferentially spaced around the distal end of the cannula; delivering fluid to the cannula sufficient to cause the distal end of the cannula to turn oppositely from the direction of the helical slits, thereby widening the slots to permit the liquid to flow from the distal end of the cannula through the widened slits.
Claim 21
Independent Claim
93 words
A method of delivering fluid to the aorta of a patient comprising the steps of: making a slit in the aorta of the patient; inserting the distal end of a cannula into the aorta through the slit, the cannula having a plurality of helical slits through the sidewall of the distal end of the cannula, circumferentially spaced around the distal end of the cannula; and delivering fluid to the cannula sufficient to widen the helical slots to permit the liquid to flow from the distal end of the cannula through the widened slits.
Claim 22
Independent Claim
93 words
A method of delivering fluid to the aorta of a patient comprising the steps of: making a slit in the aorta of the patient; inserting the distal end of a cannula into the aorta through the slit, the cannula having a plurality of helical slits through the sidewall of the distal end of the cannula, circumferentially spaced around the distal end of the cannula; and delivering fluid to the cannula sufficient to widen the helical slots to permit the liquid to flow from the distal end of the cannula through the widened slits.
Claim 23
Dependent Claim
97 words
An aortic cannula having an inner and outer wall with a proximal and distal end and a lumen therebetween for conducting fluid, the distal end adapted to be inserted into an aorta to deliver fluid to the aorta, the distal end having a plurality of helical slits therein through which fluid can exit the cannula and enter the aorta, the slits having a distal bias extending distally from the inner wall of the cannula to the outer wall of the cannula to impart a distal bias to the fluid that flows through the slits of the cannula.
Claim 24
Dependent Claim
97 words
An aortic cannula having an inner and outer wall with a proximal and distal end and a lumen therebetween for conducting fluid, the distal end adapted to be inserted into an aorta to deliver fluid to the aorta, the distal end having a plurality of helical slits therein through which fluid can exit the cannula and enter the aorta, the slits having a distal bias extending distally from the inner wall of the cannula to the outer wall of the cannula to impart a distal bias to the fluid that flows through the slits of the cannula.
Claim 25
Dependent Claim
55 words
The aortic cannula according to claims 19 wherein the slits have a distal bias such that in longitudinal cross-section the slit extends radially and distally from the inner wall of the cannula to the outer wall of the cannula to impart a distal bias to the fluid that flows through the slits of the cannula.
Claim 26
Independent Claim
68 words
A method of delivering fluid to the aorta of a patient comprising the steps of: making a slit in the aorta of the patient; inserting the distal end of a cannula into the aorta through the slit, the cannula having a plurality of helical slits therein which have a distal bias; and delivering fluid to the cannula to create a distally-biased flow from the slits into the aorta.
Claim 27
Independent Claim
68 words
A method of delivering fluid to the aorta of a patient comprising the steps of: making a slit in the aorta of the patient; inserting the distal end of a cannula into the aorta through the slit, the cannula having a plurality of helical slits therein which have a distal bias; and delivering fluid to the cannula to create a distally-biased flow from the slits into the aorta.
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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) | 2000-03-31 | 2000-09-30 | 2001-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-31 | 2004-09-30 | 2005-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-31 | 2008-09-30 | 2009-04-01 | $7700.00 | Window Closed / Lapsed |