US4889137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for improved use of heart/lung machine
Assignee: United States Department of Health and Human Services
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Filing: 1988-05-05
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Granted: 1989-12-26
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Expires: 2008-05-05
Abstract
Abstract Long term closed chest partial and total cardiopulmonary bypass by peripheral cannulation for severe right and/or left ventricular failure is achieved by the use of a percutaneous coil positioned in the pulmonary artery across the pulmonary artery valve to decompress the left heart.
Inventors
- 👤 Theodor Kolobow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:44
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/95; A61F2/82; A61F2/86; A61F2/88; A61M; A61M1/00; A61M1/36; A61M1/3621; A61M1/3666
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
37 words
A method of assisting cardiopulmonary bypass, comprising threading a coil through the right atrium, the right ventricle and into the pulmonary artery across the pulmonary artery valve to keep the pulmonary artery valve open during cardiopulmonary bypass.
Claim 2
Independent Claim
37 words
A method of assisting cardiopulmonary bypass, comprising threading a coil through the right atrium, the right ventricle and into the pulmonary artery across the pulmonary artery valve to keep the pulmonary artery valve open during cardiopulmonary bypass.
Claim 3
Dependent Claim
49 words
A method according to claim 1 wherein said coil is maintained during said threading in a first condition wherein the diameter of said coil is small, and said coil is then changed to a second condition of increased diameter when said coil is positioned across the pulmonary artery valve.
Claim 4
Dependent Claim
49 words
A method according to claim 2 wherein said coil comprises a twisted hollow tubing closed at its distal end and formed of an elastomeric plastic or rubber, said method comprising inflating said tubing after said coil has been placed across the pulmonary artery valve to effect said increased diameter.
Claim 5
Dependent Claim
33 words
A method according to claim 3 wherein said tubing is reinforced so that upon said inflation thereof it inflates primarily to increase the diameter of said coil without substantially increasing the length thereof.
Claim 6
Dependent Claim
34 words
A method according to claim 3 wherein contacting surfaces of adjacent coil sections of said coil are fused or bonded together so that upon said inflation said coil enlarges primarily in a radial direction.
Claim 7
Dependent Claim
41 words
A method according to claim 1 wherein said coil comprises a twisted wire formed of elastomeric plastic or rubber having good memory, good anti-fatigue properties, being capable of being distorted and having sufficient rigidity to maintain the pulmonary artery valve open.
Claim 8
Dependent Claim
61 words
The method of claim 6, wherein said twisted wire is maintained in a flattened state within an axial bore of a catheter until said wire is proximal said pulmonary artery valve, said wire is then released from said catheter so as to expand to an enlarged state and lodge within said pulmonary artery valve to keep said pulmonary artery valve open.
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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) | 1992-12-25 | 1993-06-26 | 1993-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-25 | 1997-06-26 | 1997-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-25 | 2001-06-26 | 2001-12-26 | $7700.00 | Window Closed / Lapsed |