Patent US3720200A successfully refreshed from Google Patents.
US3720200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intra-arterial blood pump
Assignee: KONTROL CARDIOVASCULAR Inc
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Filing: 1971-10-28
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Granted: 1973-03-13
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Expires: 1991-10-28
Abstract
Abstract The disclosure illustrates an intra-aortic circulatory assist balloon pump, expanding and contracting in synchronism with a patient''s heart rhythm to assist systemic circulation. The balloon pump comprises an elongated elastic membrane having a number of compartments supplied with pressure for expansion from an exterior source via a central tube and orifices between compartments. A second tube connects one of the end compartments and extends to an exterior flexible capacitance device that preferentially expands relative to the end compartment, thereby preventing ''''bubble blowing.
Inventors
- 👤 J Laird
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:01
CPC Classifications
A; A61; A61M; A61M60/00; A61M60/80; A61M60/841; A61M60/843; A61M60/10; A61M60/122; A61M60/126; A61M60/135; A61M60/139; A61M60/20; A61M60/295; A61M60/50; A61M60/508; A61M60/538; A61M60/554; A61M60/855; A61M60/89; A61M60/894; A61M60/247; A61M60/253; A61M60/268; A61M60/274
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
190 words
An intra-aortic circulatory assist balloon pump positionable in a patient''s aorta for inflation and deflation by an exterior pressurizing means in synchronism with the patient''s heart rhythm, said balloon pump comprising: an elastic elongated generally tubular closed end membrane having an outside diameter approximating the inner diameter of the aorta: a plurality of transverse flexible webs dividing said membrane into a pair of end compartments and a plurality of middle compartments, said webs having orifices of predetermined areas; means for forming a first passageway extending from the interior of said elastic membrane and adapted to be coupled to said exterior pressurizing means, said passageway means having an opening into a middle compartment in said membrane; means for forming a second passageway having a first end connecting with at least one of the end compartments of said membrane and a second end extending outside of said patient; and a capacitance device connected to the second end portion of said second passageway means, said capacitance device being preferentially expandable relative to said end compartment during pressurization of said membrane thereby minimizing early inflation of said end compartment relative to said middle compartments.
Claim 2
Dependent Claim
190 words
An intra-aortic circulatory assist balloon pump positionable in a patient''s aorta for inflation and deflation by an exterior pressurizing means in synchronism with the patient''s heart rhythm, said balloon pump comprising: an elastic elongated generally tubular closed end membrane having an outside diameter approximating the inner diameter of the aorta: a plurality of transverse flexible webs dividing said membrane into a pair of end compartments and a plurality of middle compartments, said webs having orifices of predetermined areas; means for forming a first passageway extending from the interior of said elastic membrane and adapted to be coupled to said exterior pressurizing means, said passageway means having an opening into a middle compartment in said membrane; means for forming a second passageway having a first end connecting with at least one of the end compartments of said membrane and a second end extending outside of said patient; and a capacitance device connected to the second end portion of said second passageway means, said capacitance device being preferentially expandable relative to said end compartment during pressurization of said membrane thereby minimizing early inflation of said end compartment relative to said middle compartments.
Claim 3
Dependent Claim
190 words
An intra-aortic circulatory assist balloon pump positionable in a patient''s aorta for inflation and deflation by an exterior pressurizing means in synchronism with the patient''s heart rhythm, said balloon pump comprising: an elastic elongated generally tubular closed end membrane having an outside diameter approximating the inner diameter of the aorta: a plurality of transverse flexible webs dividing said membrane into a pair of end compartments and a plurality of middle compartments, said webs having orifices of predetermined areas; means for forming a first passageway extending from the interior of said elastic membrane and adapted to be coupled to said exterior pressurizing means, said passageway means having an opening into a middle compartment in said membrane; means for forming a second passageway having a first end connecting with at least one of the end compartments of said membrane and a second end extending outside of said patient; and a capacitance device connected to the second end portion of said second passageway means, said capacitance device being preferentially expandable relative to said end compartment during pressurization of said membrane thereby minimizing early inflation of said end compartment relative to said middle compartments.
Claim 4
Dependent Claim
190 words
An intra-aortic circulatory assist balloon pump positionable in a patient''s aorta for inflation and deflation by an exterior pressurizing means in synchronism with the patient''s heart rhythm, said balloon pump comprising: an elastic elongated generally tubular closed end membrane having an outside diameter approximating the inner diameter of the aorta: a plurality of transverse flexible webs dividing said membrane into a pair of end compartments and a plurality of middle compartments, said webs having orifices of predetermined areas; means for forming a first passageway extending from the interior of said elastic membrane and adapted to be coupled to said exterior pressurizing means, said passageway means having an opening into a middle compartment in said membrane; means for forming a second passageway having a first end connecting with at least one of the end compartments of said membrane and a second end extending outside of said patient; and a capacitance device connected to the second end portion of said second passageway means, said capacitance device being preferentially expandable relative to said end compartment during pressurization of said membrane thereby minimizing early inflation of said end compartment relative to said middle compartments.
Claim 5
Dependent Claim
24 words
Apparatus as in claim 1 wherein said capacitance device comprises an elastic membrane connected to the second end portion of said second passageway means.
Claim 6
Dependent Claim
23 words
Apparatus as in claim 1 wherein said second passagewAy means connects with the end compartment of said membrane adjacent to the patient''s heart.
Claim 7
Dependent Claim
47 words
Apparatus as in claim 1 further comprising a first check valve connecting said first passageway means to another middle compartment of said membrane, said first check valve permitting fluid to pass only from said chamber to said first passageway means, thereby assisting the deflation of said membrane.
Claim 8
Dependent Claim
42 words
Apparatus as in claim 4 further comprising a second check valve connecting said second tube to said first tube, said second check valve only permitting flow from said second tube to said first tube whereby the deflation of said membrane is assisted.
Claim 9
Dependent Claim
28 words
Apparatus as in claim 5 wherein said first and second elongated tubes are coaxial with one another, said second tube being positioned through the interior of said tube.
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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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |