Patent US4021863A successfully refreshed from Google Patents.
US4021863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heart valve prosthesis
Assignee: MKV Corp
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Filing: 1976-09-13
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Granted: 1977-05-10
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Expires: 1996-09-13
Abstract
Abstract A heart valve having an annular base and a free-floating pivoting disc which alternately closes the annulus and is moved by blood flow pressure to an angularly open and positionally displaced orientation. A disc guide strut extending through a central opening in the disc generally directs and controls the movement of the disc from the open to closed position. A single outflow pivot is provided in planar alignment with the disc guide strut, and this pivot coupled with the absence of a wedging position for the disc minimizes the tendency to produce areas of blood stagnation.
Inventors
- 👤 Arne Woien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:45
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/24; A61F2/2403; A61F2/2406; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7898; Y10T137/7903
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
345 words
A heart valve for controlling the flow of blood comprising: a. a valve base of a generally annular configuration defining a circular opening therethrough, said valve base having an outflow side and an inflow said and an interior wall; b. inflow pivot members extending inwardly from said wall into said opening along a chordal axis towards one another and in a first plane generally parellel to the plane of said valve base, said inflow pivots being spaced towards the inflow side of said valve base; c. a single outflow pivot member extending radially into said opening from said wall and perpendicular to the chordal axis of said inflow pivot members, said outflow pivot member being generally in a second plane parallel to the plane of said valve base with the interior surface thereof spaced in the direction of the axis of said valve base from the interior surface of said inflow pivot members; d. a disc guide strut projecting generally inwardly from said wall towards the center of said valve base opening in a third plane intersecting the axis of said valve base opening and of the outflow pivot, said strut defining an S-shaped curve extending diagonally upstream out of said valve base and curving back to pass axially through the center of said opening and then curving diagonally downstream of said valve base to terminate in a free end; e. a valve disc of circular shape having a diameter slightly smaller than said opening, said valve disc defining an axial orifice therethrough of a diameter slightly larger than the diameter of said guide strut, said valve disc being mounted in said valve base with said guide strut extending through said orifice and being positioned when in the closed mode intermediate said inflow pivots and said single outflow pivot; and, f. a valve disc stop shoulder extending inwardly from said wall on the side of said opening opposite said outflow pivot, said shoulder being in the first plane so that said valve disc in the closed position is in the plane of said valve base.
Claim 2
Dependent Claim
345 words
A heart valve for controlling the flow of blood comprising: a. a valve base of a generally annular configuration defining a circular opening therethrough, said valve base having an outflow side and an inflow said and an interior wall; b. inflow pivot members extending inwardly from said wall into said opening along a chordal axis towards one another and in a first plane generally parellel to the plane of said valve base, said inflow pivots being spaced towards the inflow side of said valve base; c. a single outflow pivot member extending radially into said opening from said wall and perpendicular to the chordal axis of said inflow pivot members, said outflow pivot member being generally in a second plane parallel to the plane of said valve base with the interior surface thereof spaced in the direction of the axis of said valve base from the interior surface of said inflow pivot members; d. a disc guide strut projecting generally inwardly from said wall towards the center of said valve base opening in a third plane intersecting the axis of said valve base opening and of the outflow pivot, said strut defining an S-shaped curve extending diagonally upstream out of said valve base and curving back to pass axially through the center of said opening and then curving diagonally downstream of said valve base to terminate in a free end; e. a valve disc of circular shape having a diameter slightly smaller than said opening, said valve disc defining an axial orifice therethrough of a diameter slightly larger than the diameter of said guide strut, said valve disc being mounted in said valve base with said guide strut extending through said orifice and being positioned when in the closed mode intermediate said inflow pivots and said single outflow pivot; and, f. a valve disc stop shoulder extending inwardly from said wall on the side of said opening opposite said outflow pivot, said shoulder being in the first plane so that said valve disc in the closed position is in the plane of said valve base.
Claim 3
Dependent Claim
25 words
A heart valve in accordance with claim 1 wherein said stop shoulder is formed by the juncture of said disc guide strut with said wall.
Claim 4
Dependent Claim
61 words
A heart valve in accordance with claim 1 wherein the interior inflow edge of said outflow pivot member is curved to facilitate pivotal movement of said valve disc to the open position and has a sloped surface at about 70°-75° to the plane of said valve base which defines with said inflow pivots the maximum open angle of said valve disc.
Claim 5
Dependent Claim
46 words
A heart valve in accordance with claim 1 wherein said guide strut has the portion which passes axially through said opening of a circular shape and a larger cross-section than the balance of said guide strut with the larger portion tapering smoothly to the smaller portions.
Claim 6
Dependent Claim
28 words
A heart valve in accordance with claim 3 wherein said outflow pivot member has a generally ellipsoidal cross-section with the major axis in the direction of blood flow.
Claim 7
Dependent Claim
36 words
A heart valve in accordance with claim 4 wherein the portion of said guide strut between the wall and axial section has a generally ellipsoidal cross-section with the major axis in the direction of blood flow.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |