US4610662A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the elimination or the enlargement of points of constriction in vessels carrying body fluids
Assignee: Schneider Medintag AG
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Filing: 1983-07-22
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Granted: 1986-09-09
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Expires: 2003-07-22
Abstract
Abstract For the provision of an apparatus to lessen or remove points of constriction in vessels of all types whereby ruptures and tears are to be avoided in the vessel walls and, during the treatment of stenosis in blood vessels, the danger of infarction is to be avoided, through use of a treatment catheter (1) that is equipped with two expandable balloons (4, 5) which seal off both sides of a point of constriction (6) in a vessel, whereby the degree of expansion of both balloons (4, 5) can be controlled externally, it is proposed that there be mounted in the wall of the treatment catheter (1) within the region confined by the balloons (4, 5) an inlet piece (A) for the supply of media capable of dissolving or crumbling into smaller particles the material (7) at the point of constriction and an outlet piece (B) for the removal of the material (7) dissolved or crumbled at the point of constriction, whereby these pieces are connected with an externally accessible conduit (10, 11) (FIG. 1).
Inventors
- 👤 Andreas Weikl
- 👤 Volkmar Merkel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:07
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/10; A61M25/1011; A61B; A61B17/00; A61B17/22; A61B2017/22051; A61B2017/22054; A61B2017/22082; A61B2017/22084; A61M2025/1043; A61M2025/1052
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
A method of treating stenosis by eliminating or expanding the points of constriction which are customarily formed of a sponge-like calcified and fatty tissue in blood carrying vessels of the body through use of a flexible treatment catheter having separate support conduits formed by longitudinal partition walls and at whose end two balloons are situated, said method comprising the steps of sealing off the section of the blood vessel containing the stenosis with the two balloons, introducing a solvent of predetermined concentration and duration of effect to act upon the stenosis through a first support conduit in the catheter such that the tissue of the stenosis is dissolved, softened, or crumbled into smaller particles, and draining the particles from the sealed section of the blood vessel through a second separate support conduit.
Claim 2
Independent Claim
132 words
A method of treating stenosis by eliminating or expanding the points of constriction which are customarily formed of a sponge-like calcified and fatty tissue in blood carrying vessels of the body through use of a flexible treatment catheter having separate support conduits formed by longitudinal partition walls and at whose end two balloons are situated, said method comprising the steps of sealing off the section of the blood vessel containing the stenosis with the two balloons, introducing a solvent of predetermined concentration and duration of effect to act upon the stenosis through a first support conduit in the catheter such that the tissue of the stenosis is dissolved, softened, or crumbled into smaller particles, and draining the particles from the sealed section of the blood vessel through a second separate support conduit.
Claim 3
Dependent Claim
31 words
The method defined in claim 1, and including maintaining the circulation of blood contained in the blood-carrying vessels to the downstream organs by a further separate support conduit in the catheter.
Claim 4
Dependent Claim
50 words
The method defined in claim 1, wherein the solvent, as determined by its type, concentration, and duration of effect, acts upon the stenosis only to soften the tissue to permit it to be removed as a whole by the treatment catheter when the treatment catheter is withdrawn from the vessel.
Claim 5
Dependent Claim
52 words
The method defined in claim 1, wherein the solvent, as determined by its type, concentration, and duration of effect, acts upon the stenosis to such an extent that the tissue of the stenosis is crumbled into smaller particles which are removed through the second separate draining support conduit of the treatment catheter.
Claim 6
Dependent Claim
21 words
The method defined in claim 1, wherein the solvents are selected from the group consisting of enzymes, acids and alkaline solutions.
Claim 7
Dependent Claim
13 words
The method defined in claim 5, wherein the acid is a nitrous acid.
Claim 8
Dependent Claim
13 words
The method defined in claim 5, wherein the alkaline solution is caustic soda.
Claim 9
Dependent Claim
28 words
The method defined in claim 1, characterized in that the duration of effect of the solvent on the stenosis is limited to a predetermined time interval by inhibitors.
Claim 10
Dependent Claim
32 words
The method defined in claim 1, and including a circulating rinse for the removal of the tissue at the point of constriction which has been dissolved, softened or crumbled into smaller particles.
Claim 11
Dependent Claim
20 words
The method defined in claim 9, characterized in that the double-balloon catheter is used for performing the circulating rinse process.
References Cited (Backward Citations)
DE1069823B
Cited
US2687131A
Cited
FR1460776A
Cited
FR2350849A1
Cited
DE2816391A1
Cited
DE2848484A1
Cited
US4224929A
Cited
DE2834956A1
Cited
GB2054385A
Cited
US4271839A
Cited
DE2933266A1
Cited
US4430083A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-08 | 1990-03-10 | 1990-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-08 | 1994-03-10 | 1994-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-08 | 1998-03-10 | 1998-09-09 | $7700.00 | Window Closed / Lapsed |