US5893869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retrievable inferior vena cava filter system and method for use thereof
Assignee: University of Iowa Research Foundation
•
Filing: 1997-02-19
•
Granted: 1999-04-13
•
Expires: 2017-02-19
Abstract
Abstract A percutaneous filter system for providing temporary filtering of emboli from the blood is disclosed, the filter system including a delivery catheter having a first working access lumen and a second filter deployment/retrieval lumen containing a filtering device which is deployable therefrom. The filtering device includes a deployment/retrieval wire section and a filtering element formed at the distal end of said deployment/retrieval wire section. The filtering element is made of shape memory/superelastic material and is formed to have a distally expanding frustoconical pre-disposed shape which, when the filtering element is deployed by being extended distally from the delivery catheter through the filter deployment/retrieval lumen thereof, defines a filtering channel that is offset from said deployment/retrieval axis and extends about the extended axis of the working access lumen of the delivery catheter. When the filtering element is so deployed within a blood vessel, emboli trapped within the filtering element are funneled toward working access lumen of the delivery catheter and can easily be aspirated or otherwise removed therethrough. With the filtering element in place in its deployed position, other instrumentation may also be passed through the working access lumen of the delivery catheter and the filtering channel to gain access into the blood vessel as desired.
Inventors
- 👤 William H. Barnhart
- 👤 Elvira V. Lang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:54
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/01; A61B; A61B17/00; A61B17/22; A61F2002/016; A61F2210/00; A61F2210/0014; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0006; A61F2230/0063; A61F2230/0091
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
171 words
A filtering system for filtering emboli from blood within a blood vessel, said filtering system comprising: a delivery catheter having a first working access lumen defining a working access axis, and a second filter deployment/retrieval lumen defining a filter deployment/retrieval axis; and a filtering device receivable within said filter deployment/retrieval lumen, said filtering device including a deployment/retrieval wire section and a filtering element formed at the distal end of said deployment/retrieval wire section, said filtering element being made of shape memory/superelastic material and being formed to have a pre-disposed shape which, when said filtering element has been deployed by being extended distally from said delivery catheter through said filter deployment/retrieval lumen thereof, defines a filtering channel that is offset from said deployment/retrieval axis and which extends about the extended axis of the working access lumen of the delivery catheter, whereby when said filtering element is so deployed within a blood vessel, emboli trapped within the filtering element are funneled toward the working access lumen of said delivery catheter for removal therethrough.
Claim 2
Dependent Claim
171 words
A filtering system for filtering emboli from blood within a blood vessel, said filtering system comprising: a delivery catheter having a first working access lumen defining a working access axis, and a second filter deployment/retrieval lumen defining a filter deployment/retrieval axis; and a filtering device receivable within said filter deployment/retrieval lumen, said filtering device including a deployment/retrieval wire section and a filtering element formed at the distal end of said deployment/retrieval wire section, said filtering element being made of shape memory/superelastic material and being formed to have a pre-disposed shape which, when said filtering element has been deployed by being extended distally from said delivery catheter through said filter deployment/retrieval lumen thereof, defines a filtering channel that is offset from said deployment/retrieval axis and which extends about the extended axis of the working access lumen of the delivery catheter, whereby when said filtering element is so deployed within a blood vessel, emboli trapped within the filtering element are funneled toward the working access lumen of said delivery catheter for removal therethrough.
Claim 3
Dependent Claim
41 words
The filtering system for filtering emboli from blood within a blood vessel of claim 1 wherein the filtering channel defined by said filtering element is at least as large as the diameter of said working access lumen of said delivery catheter.
Claim 4
Dependent Claim
31 words
The filtering system for filtering emboli from blood within a blood vessel of claim 1 wherein said filtering element is generally expanding in the distal direction away from said delivery catheter.
Claim 5
Dependent Claim
24 words
The filtering system for filtering emboli from blood within a blood vessel of claim 1 wherein said filtering element forms a generally frustoconical shape.
Claim 6
Dependent Claim
52 words
The filtering system for filtering emboli from blood within a blood vessel of claim 1 wherein the filter axis is offset from said deployment/retrieval wire an amount approximately equal to the distance between the axes of the filter deployment/retrieval lumen and the working access lumen at the distal end of said catheter.
Claim 7
Dependent Claim
34 words
The filtering system for filtering emboli from blood within a blood vessel of claim 1 wherein the diameter of the working access lumen is substantially larger than the diameter of the filter deployment/retrieval lumen.
Claim 8
Dependent Claim
43 words
The filtering system for filtering emboli from blood within a blood vessel of claim 1 wherein said filtering element includes a series of turns and wherein each turn successively increases in diameter from the most proximal to the most distal of said turns.
Claim 9
Dependent Claim
28 words
The filtering system for filtering emboli from blood within a blood vessel of claim 7 wherein there are a total of between 4 to 8 of said turns.
Claim 10
Dependent Claim
35 words
The filtering system for filtering emboli from blood within a blood vessel of claim 8 wherein the diameter of the most distal of said turns is greater than the inner diameter of the blood vessel.
Claim 11
Dependent Claim
36 words
The filtering device for filtering emboli from blood within a blood vessel of claim 1 wherein the shape memory/superelastic alloy from which said filtering element is made is in its superelastic temperature range at blood temperature.
Claim 12
Dependent Claim
28 words
The filtering system for filtering emboli from blood within a blood vessel of claim 10 wherein said filtering device is an integrally formed, one-piece wire made of Nitinol.
Claim 13
Dependent Claim
29 words
The filtering system for filtering emboli from blood within a blood vessel of claim 1 wherein the filter deployment/retrieval lumen is enlarged at the distal end of said catheter.
Claim 14
Dependent Claim
32 words
The filtering system for filtering emboli from blood within a blood vessel of claim 1 wherein said catheter has an outer surface that is tapered at the distal end of said catheter.
Claim 15
Independent Claim
222 words
A method for filtering emboli from blood within a blood vessel, said method comprising the steps of: introducing a delivery catheter into the blood vessel, the delivery catheter having a first working access lumen defining a working access axis, and a second filter deployment/retrieval lumen defining a filter deployment/retrieval axis, and a filtering device received within the filter deployment/retrieval lumen, the filtering device including a deployment/retrieval wire section and a filtering element formed at the distal end of the deployment/retrieval wire section, the filtering element being made of shape memory/superelastic material and being formed to have a pre-disposed shape which, when the filtering element has been deployed by being extended distally from the delivery catheter through the filter deployment/retrieval lumen thereof, defines a filtering channel that is offset from the deployment/retrieval axis and which extends about the extended axis of the working access lumen of the delivery catheter; advancing the distal end of the delivery catheter to a desired location within the blood vessel; and advancing the filtering device relative to the delivery catheter so that the filtering element exits the filter deployment/retrieval lumen at the distal end of the catheter and expands into its pre-disposed shape within the blood vessel, whereby emboli trapped within the filtering element are funneled toward the working access lumen of the delivery catheter for removal therethrough.
Claim 16
Independent Claim
222 words
A method for filtering emboli from blood within a blood vessel, said method comprising the steps of: introducing a delivery catheter into the blood vessel, the delivery catheter having a first working access lumen defining a working access axis, and a second filter deployment/retrieval lumen defining a filter deployment/retrieval axis, and a filtering device received within the filter deployment/retrieval lumen, the filtering device including a deployment/retrieval wire section and a filtering element formed at the distal end of the deployment/retrieval wire section, the filtering element being made of shape memory/superelastic material and being formed to have a pre-disposed shape which, when the filtering element has been deployed by being extended distally from the delivery catheter through the filter deployment/retrieval lumen thereof, defines a filtering channel that is offset from the deployment/retrieval axis and which extends about the extended axis of the working access lumen of the delivery catheter; advancing the distal end of the delivery catheter to a desired location within the blood vessel; and advancing the filtering device relative to the delivery catheter so that the filtering element exits the filter deployment/retrieval lumen at the distal end of the catheter and expands into its pre-disposed shape within the blood vessel, whereby emboli trapped within the filtering element are funneled toward the working access lumen of the delivery catheter for removal therethrough.
Claim 17
Dependent Claim
41 words
The method for filtering emboli from blood within a blood vessel of claim 14 in which the filtering channel defined by said filtering element is at least as large as the diameter of the working access lumen of the delivery catheter.
Claim 18
Dependent Claim
31 words
The method for filtering emboli from blood within a blood vessel of claim 14 in which the filtering element is generally expanding in the distal direction away from the delivery catheter.
Claim 19
Dependent Claim
24 words
The method for filtering emboli from blood within a blood vessel of claim 14 in which the filtering element forms a generally frustoconical shape.
Claim 20
Dependent Claim
30 words
The method for filtering emboli from blood within a blood vessel of claim 14 further includes the step of applying suction to the desired location through the working access lumen.
Claim 21
Dependent Claim
44 words
The method for filtering emboli from blood within a blood vessel of claim 18 wherein said applying suction step includes advancing a catheter having proximal and distal ends through the working access lumen, said catheter having a suction source connected at its proximal end.
Claim 22
Dependent Claim
43 words
The method for filtering emboli from blood within a blood vessel of claim 14 which additionally includes the step of passing another instrument through the working access lumen of the delivery catheter and the filtering channel to gain access into the blood vessel.
Claim 23
Dependent Claim
36 words
The method for filtering emboli from blood within a blood vessel of claim 14 in which the shape memory/superelastic alloy from which the filtering element is made is in its superelastic temperature range at blood temperature.
References Cited (Backward Citations)
US3472230A
Cited
US3908661A
Cited
US4564014A
Cited
US4425908A
Cited
US4610662A
Cited
US4573966A
Cited
US4655771B1
Cited
US4655771A
Cited
US4494531A
Cited
US4585000A
Cited
US4842579B1
Cited
US4842579A
Cited
US4926858A
Cited
US4610622A
Cited
US4577631A
Cited
US4790812A
Cited
US4866061A
Cited
US4866061B1
Cited
US4723549A
Cited
US4793348A
Cited
US4781177A
Cited
US4794928A
Cited
US4873978A
Cited
US4957501A
Cited
US4886061A
Cited
US4990156A
Cited
US4832055A
Cited
US5059178A
Cited
US5102415A
Cited
US5059205A
Cited
US5242462A
Cited
US5100425A
Cited
US5092839A
Cited
US5531788A
Cited
US5133733A
Cited
US5300086A
Cited
US5154724A
Cited
US5329942A
Cited
US5160342A
Cited
US5108419A
Cited
US5147379A
Cited
US5413586A
Cited
US5350398A
Cited
US5147370A
Cited
US5415630A
Cited
US5397310A
Cited
US5324304A
Cited
US5549626A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-04-12 | 2002-10-12 | 2003-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-04-12 | 2006-10-12 | 2007-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-04-12 | 2010-10-12 | 2011-04-13 | $7700.00 | Window Closed / Lapsed |