Patent US4051840A successfully refreshed from Google Patents.
US4051840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dynamic aortic patch
Assignee: L'VAD TECHNOLOGY Inc A CORP OF MI
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Filing: 1976-01-05
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Granted: 1977-10-04
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Expires: 1996-01-05
Abstract
Abstract An improved dynamic aortic patch is surgically implanted in the thoracic aorta and is systematically inflated and deflated to generate pressure waves in the bloodstream. The pressure waves assist the heart by augmenting the circulation of the blood through the body. The patch includes a flexible inflatable bladder and an independent envelope. The envelope has a reinforced surface for limiting and directing inflation of the bladder inwardly toward the lumen of the aorta.
Inventors
- 👤 Adrian Kantrowitz
- 👤 Paul S. Freed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:50
CPC Classifications
A; A61; A61M; A61M60/00; A61M60/20; A61M60/289; A61M60/10; A61M60/122; A61M60/126; A61M60/135; A61M60/139; A61M60/40; A61M60/465; A61M60/468; A61M60/80; A61M60/839
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
173 words
In a mechanical auxiliary blood pumping apparatus such as an aortic patch or the like adapted to be surgically implanted in an aortic vessel for assisting blood circulation and including a flexible, air tight bladder to be systematically inflated and deflated by application of fluidic pressure, and an envelope for said bladder having a non-thrombogenic surface facing the interior of the aortic vessel, the improvement comprising: said bladder and said envelope being distinct, separate, independent components of said apparatus, said envelope being adapted to be implanted and sutured into the aortic vessel in a tight, sealing relationship to the intima of the vessel to prevent leakage and loss of blood outwardly of the vessel, with said non-thrombogenic surface facing the interior of said aortic vessel, and said bladder being thereafter removably positioned within said envelope whereby said envelope is permanently implantable without damage to said bladder such as by puncturing during suturing and the like and whereby said bladder is insertable and removable without removal of said envelope and thus without extracorporeal bypass.
Claim 2
Dependent Claim
173 words
In a mechanical auxiliary blood pumping apparatus such as an aortic patch or the like adapted to be surgically implanted in an aortic vessel for assisting blood circulation and including a flexible, air tight bladder to be systematically inflated and deflated by application of fluidic pressure, and an envelope for said bladder having a non-thrombogenic surface facing the interior of the aortic vessel, the improvement comprising: said bladder and said envelope being distinct, separate, independent components of said apparatus, said envelope being adapted to be implanted and sutured into the aortic vessel in a tight, sealing relationship to the intima of the vessel to prevent leakage and loss of blood outwardly of the vessel, with said non-thrombogenic surface facing the interior of said aortic vessel, and said bladder being thereafter removably positioned within said envelope whereby said envelope is permanently implantable without damage to said bladder such as by puncturing during suturing and the like and whereby said bladder is insertable and removable without removal of said envelope and thus without extracorporeal bypass.
Claim 3
Dependent Claim
37 words
The invention as defined in claim 1 wherein said flexible bladder is formed of a thin film and has longitudinal filaments therein for preventing the bladder from closing the entrapping fluid therein during deflation of said bladder.
Claim 4
Dependent Claim
46 words
The invention as defined in claim 1 wherein said envelope includes a second surface facing the thoracic cavity, said second surface being reinforced by cross-stitching to prevent said second surface from stretching and to thereby direct and limit said bladder inflation inwardly of the aortic vessel.
Claim 5
Dependent Claim
42 words
The invention as defined in claim 1 wherein one end of said flexible bladder includes a flexible hollow tube in communication with the interior of the bladder for supplying fluid to said bladder to permit said bladder to be inflated and deflated.
References Cited (Backward Citations)
US3585983A
Cited
US3766567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |