Patent US3349638A successfully refreshed from Google Patents.
US5324261A
Expired / Lapsed
US
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Drug delivery balloon catheter with line of weakness
Assignee: Medtronic Inc
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Filing: 1992-12-11
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Granted: 1994-06-28
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Expires: 2012-12-11
Abstract
Abstract A balloon catheter includes a sheath surrounding the balloon, the sheath having a longitudinal line of weakness and a drug-containing viscous matrix material intermediate between the balloon and the sheath such that when the balloon is positioned and inflated in the body lumen it causes the sheath to burst at the line of weakness and release viscous matrix material onto said body lumen. The device provides accurate placement of the dosage required at the location in need of treatment. The catheter is especially useful in balloon angioplasty procedures.
Inventors
- 👤 Rodney R. Amundson
- 👤 Vincent W. Hull
- 👤 Michael Dror
- 👤 Robert S. Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:20
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/10; A61M25/104; A61F; A61F2/00; A61F2/95; A61F2/958; A61L; A61L29/00; A61L29/14; A61L29/16; A61F2250/00; A61F2250/0058; A61F2250/0067; A61L2300/00; A61L2300/40; A61L2300/404; A61L2300/406; A61L2300/41; A61L2300/416; A61L2300/42; A61L2300/60; A61L2300/62; A61L2300/622; A61M2025/1043; A61M2025/105; A61M2025/1081; A61M2025/1086; A61M25/1002
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
110 words
In a catheter of the type comprising a catheter body and an inflatable balloon positioned along the length of the catheter body; the improvement comprising: a sheath over the balloon, the sheath having a longitudinal line of weakness sufficient to cause the sheath to burst at the line of weakness as the balloon is inflated; and a viscous matrix material intermediate between the balloon and the sheath, said viscous matrix material having a drug or combination of drugs for treatment or diagnostics within a body lumen such that when the balloon is inflated it causes the sheath to burst at the line of weakness and expose the viscous matrix material.
Claim 2
Dependent Claim
110 words
In a catheter of the type comprising a catheter body and an inflatable balloon positioned along the length of the catheter body; the improvement comprising: a sheath over the balloon, the sheath having a longitudinal line of weakness sufficient to cause the sheath to burst at the line of weakness as the balloon is inflated; and a viscous matrix material intermediate between the balloon and the sheath, said viscous matrix material having a drug or combination of drugs for treatment or diagnostics within a body lumen such that when the balloon is inflated it causes the sheath to burst at the line of weakness and expose the viscous matrix material.
Claim 3
Dependent Claim
13 words
The catheter of claim 1 wherein said viscous matrix also includes drug-containing microcapsules.
Claim 4
Dependent Claim
13 words
The catheter of claim 1 wherein said viscous matrix has anti-restenosis drugs therein.
Claim 5
Dependent Claim
29 words
The catheter of claim 1 wherein said viscous matrix comprises a bioabsorbable polymer selected from the group consisting of polyorthoester, polysaccharide, polyphosphoester, polyglycolic acid, polylactic acid and polyvinyl pyrrolidone.
Claim 6
Dependent Claim
15 words
The catheter of claim 1 wherein said viscous matrix material is sealed within the sheath.
Claim 7
Dependent Claim
19 words
The catheter of claim 5 wherein the sheath is sealed at its proximal and distal ends to the catheter.
Claim 8
Dependent Claim
14 words
The catheter of claim 1 wherein the sheath is made from an elastomeric material.
Claim 9
Dependent Claim
13 words
The catheter of claim 7 wherein the elastomeric material is a silicone elastomer.
Claim 10
Independent Claim
95 words
A method for applying a drug to a body lumen comprising the steps of: a. inserting a dilatation catheter having a drug-containing viscous matrix material on the exterior of a catheter balloon and a sheath having a longitudinal line of weakness over the balloon and viscous matrix material into a body lumen to a point where treatment is desired; b. bursting the sheath at the line of weakness by expanding said balloon, thereby exposing the viscous matrix material; c. releasing the exposed viscous matrix material against the lumen wall; and d. removing said dilatation catheter.
Claim 11
Independent Claim
95 words
A method for applying a drug to a body lumen comprising the steps of: a. inserting a dilatation catheter having a drug-containing viscous matrix material on the exterior of a catheter balloon and a sheath having a longitudinal line of weakness over the balloon and viscous matrix material into a body lumen to a point where treatment is desired; b. bursting the sheath at the line of weakness by expanding said balloon, thereby exposing the viscous matrix material; c. releasing the exposed viscous matrix material against the lumen wall; and d. removing said dilatation catheter.
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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) | 1997-06-27 | 1997-12-27 | 1998-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-27 | 2001-12-27 | 2002-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-27 | 2005-12-27 | 2006-06-28 | $7700.00 | Window Closed / Lapsed |