US5163952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expandable polymeric stent with memory and delivery apparatus and method
Assignee: Individual
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Filing: 1990-09-14
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Granted: 1992-11-17
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Expires: 2010-09-14
Abstract
Abstract Self-restrained stent for use in a lumen of a vessel of a patient having a body with the vessel therein, comprising a substantially cylindrical member formed of a plastic material having a built-in elastic predetermined diameter and having a memory provided therein of a diameter greater than the predetermined diameter. The plastic is characterized in that it will attempt to assume the greater diameter in its memory upon occurrence of one or more of the following conditions: (a) adsorption of heat by the plastic material; (b) adsorption of a liquid by the plastic material; and (c) a change in the pH in the liquid in which the plastic member is disposed.
Inventors
- 👤 Michael Froix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:26
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/82; A61F2/86; A61F2/88; A61F2/90; A61F2/94; A61F2/95; A61F2/958; A61L; A61L31/00; A61L31/04; A61L31/041; A61L31/14; A61L31/146; A61L31/16; A61F2210/00; A61F2210/0004; A61F2210/0014; A61F2210/0023; A61F2210/0042; A61F2210/0047; A61F2250/00; A61F2250/0058; A61F2250/0067
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
190 words
A self-restrained stent for use in a lumen defined by a wall of a vessel of a patient having a body with the vessel therein, comprising a hollow substantially cylindrical member formed of a plastic material having an initial built-in elastic predetermined diameter which is less than the diameter of the lumen in the vessel so that the substantially cylindrical member can be inserted into the lumen of the vessel, said plastic material also having a memory based on a thermal transition provided therein of a diameter greater than the initial predetermined diameter and at least as great as the diameter of the lumen of the vessel, said plastic being characterized in that it will assume the greater diameter and move into engagement with the wall of the vessel upon the absorption of heat by the plastic material to activate said thermal transition which is achieved by one of the following selected from the group consisting of (a) a melting point of the main chain; (b) a melting point of the side chain; (c) a glass transition temperature; (d) a liquid crystal transition; and (e) a local mode molecular transition.
Claim 2
Dependent Claim
190 words
A self-restrained stent for use in a lumen defined by a wall of a vessel of a patient having a body with the vessel therein, comprising a hollow substantially cylindrical member formed of a plastic material having an initial built-in elastic predetermined diameter which is less than the diameter of the lumen in the vessel so that the substantially cylindrical member can be inserted into the lumen of the vessel, said plastic material also having a memory based on a thermal transition provided therein of a diameter greater than the initial predetermined diameter and at least as great as the diameter of the lumen of the vessel, said plastic being characterized in that it will assume the greater diameter and move into engagement with the wall of the vessel upon the absorption of heat by the plastic material to activate said thermal transition which is achieved by one of the following selected from the group consisting of (a) a melting point of the main chain; (b) a melting point of the side chain; (c) a glass transition temperature; (d) a liquid crystal transition; and (e) a local mode molecular transition.
Claim 3
Dependent Claim
55 words
A stent as in claim 1 wherein said plastic material has a thermal transition which is achieved by one of the following: (a) a melting point of the main chain; (b) a melting point of a side chain; (c) a glass transition temperature; (d) a liquid crystal transition; and (3) a local mode molecular transition.
Claim 4
Dependent Claim
34 words
A stent as in claim 1 wherein said substantially cylindrical member is formed of a substantially porous material to facilitate the ingrowth of neointimal and endothelial vessel tissue in the body of the patient.
Claim 5
Dependent Claim
14 words
A stent as in claim 1 wherein said substantially cylindrical member carries medical agents.
Claim 6
Dependent Claim
14 words
A stent as in claim 4 wherein said medical agent is a thrombolytic agent.
Claim 7
Dependent Claim
14 words
A stent as in claim 4 wherein said medical agent is a growth factor.
Claim 8
Dependent Claim
15 words
A stent as in claim 4 wherein said medical agent is a slow release medication.
Claim 9
Dependent Claim
13 words
A stent as in claim 1 wherein said plastic is a polymeric composition.
Claim 10
Dependent Claim
14 words
A stent as in claim 8 wherein said polymeric composition includes a thermal initiator.
Claim 11
Dependent Claim
14 words
A stent as in claim 8 wherein said polymeric composition includes an ultraviolet initiator.
Claim 12
Dependent Claim
14 words
A stent as in claim 8 wherein said polymeric composition includes a crosslinking agent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-17 | 1996-05-18 | 1996-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-17 | 2000-05-18 | 2000-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-17 | 2004-05-18 | 2004-11-17 | $7700.00 | Window Closed / Lapsed |