US3755823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible stent for heart valve
Assignee: Medtronic Inc
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Filing: 1971-04-23
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Granted: 1973-09-04
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Expires: 1991-04-23
Abstract
Abstract An arrangement for heart valves that includes a stent having apexes interconnected by arms, the apexes being deflectable inwardly upon hemodynamic loading of the heart valve for reducing the stress in the valve tissue, the stent being covered by a cloth sleeve which may have an integral bead or flap for attachment to the heart, padding being provided beneath portions of the sleeve for protection, and a reinforcing ring extending around the assembly over the marginal portions of the heart valve, with sutures extending through the reinforcing ring and tissue of the heart valve for forming an attachment to the stent.
Inventors
- 👤 W Hancock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:14
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/24; A61F2/2412; A61F2/2418; A61F2/2409; Y; Y10; Y10S; Y10S623/00; Y10S623/90
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
138 words
A stent for a heart valve comprising a framework of annular configuration, said framework including spaced apical portions extending around the longitudinal axis thereof and arms interconnecting said apical portions, for thereby providing an attachment for the commissures and cusps of a heart valve, said framework including means for permitting substantial resilient deflection of said apical portions inwardly toward said longitudinal axis of said framework such that there is an apical portion so deflected a distance of at least approximately 2 millimeters in response to predetermined loading on said apical portions, which loading is that produced by hemodynamic pressure of approximately 2.3 psi. when a heart valve is mounted on said framework and grafted in the heart of a human, and return of said apical portions to the original positions thereof upon the removal of said predetermined loading.
Claim 2
Dependent Claim
138 words
A stent for a heart valve comprising a framework of annular configuration, said framework including spaced apical portions extending around the longitudinal axis thereof and arms interconnecting said apical portions, for thereby providing an attachment for the commissures and cusps of a heart valve, said framework including means for permitting substantial resilient deflection of said apical portions inwardly toward said longitudinal axis of said framework such that there is an apical portion so deflected a distance of at least approximately 2 millimeters in response to predetermined loading on said apical portions, which loading is that produced by hemodynamic pressure of approximately 2.3 psi. when a heart valve is mounted on said framework and grafted in the heart of a human, and return of said apical portions to the original positions thereof upon the removal of said predetermined loading.
Claim 3
Dependent Claim
39 words
A device as recited in claim 1 in which, for said means for permitting said resilient deflection of said apical portions, said arms are twistable as torsion bars upon the application of said predetermined loading to said apical portions.
Claim 4
Dependent Claim
32 words
A device as recited in claim 2 in which said apical portions are relatively rigid so as to be substantially undistorted upon the application of said predetermined loading to said apical portions.
Claim 5
Dependent Claim
35 words
A device as recited in claim 2 in which said framework includes additional arms collectively of annular shape, said additional arms being spaced axially from said first-mentioned arms and relatively closer to said apical portions.
Claim 6
Dependent Claim
23 words
A device as recited in claim 4 in which said additional arms incline axially away from said apical portions intermediate said apical portions.
Claim 7
Dependent Claim
35 words
A device as recited in claim 5 in which said additionAl arms are deflectable to take a permanent set while retaining the resilience thereof for varying the distances thereof from the axis of said framework.
Claim 8
Dependent Claim
24 words
A device as recited in claim 6 including in addition means interconnecting said first-mentioned arms and said additional arms for stiffening said additional arms.
Claim 9
Dependent Claim
34 words
A device as recited in claim 7 in which said means interconnecting said first-mentioned arms and said additional arms includes members connecting to said additional arms at locations angularly spaced from said apical portions.
Claim 10
Dependent Claim
24 words
A device as recited in claim 8 in which said members are substantially at the midpoints of said first-mentioned arms and said additional arms.
Claim 11
Dependent Claim
25 words
A device as recited in claim 8 in which said members are in pairs, positioned one on either side of each of said apical portions.
Claim 12
Dependent Claim
20 words
A device as recited in claim 10 in which said members of each pair are divergent toward said additional arms.
Claim 13
Dependent Claim
38 words
A device as recited in claim 11 in which said framework includes a post interconnecting each of said apical portions and said first-mentioned arms, each of said posts being positioned between said members of each of said pairs.
Claim 14
Dependent Claim
19 words
A device as recited in claim 2 in which said framework is constructed of a resilient stainless steel material.
Claim 15
Dependent Claim
18 words
A device as recited in claim 2 in which said framework is constructed of a resilient plastic material.
Claim 16
Dependent Claim
32 words
A device as recited in claim 14 including in addition a metal ring around the exterior of said framework at the end thereof remote from said apical portions for reinforcing said framework.
Claim 17
Dependent Claim
44 words
A device as recited in claim 15 in which said framework includes an annular groove receiving said ring, said groove having an inner surface tapering away from said apical portions so that said ring will not restrict said resilient deflection of said apical portions.
Claim 18
Dependent Claim
137 words
A heart valve assembly comprising a stent, said stent including a generally tubular framework having spaced apexes at one end and arms inter-connecting said apexes, said apexes being normally spaced a predeter-mined distance from the longitudinal axis of said framework, a heart valve on said framework, said heart valve having commissures substantially at said apexes and cusps having marginal portions adjacent said arms, and means for attaching said heart valve to said framework, said framework including means for permitting substantial resilient deflection of said apexes inwardly toward said axis a distance of at least approximately 2 millimeters in response to hemodynamic pressure of approximately 2.3 psi. on said heart valve upon grafting of said heart valve in a heart, and return of said apexes to said predetermined distance from said axis upon removal of said hemodynamic pressure.
Claim 19
Dependent Claim
137 words
A heart valve assembly comprising a stent, said stent including a generally tubular framework having spaced apexes at one end and arms inter-connecting said apexes, said apexes being normally spaced a predeter-mined distance from the longitudinal axis of said framework, a heart valve on said framework, said heart valve having commissures substantially at said apexes and cusps having marginal portions adjacent said arms, and means for attaching said heart valve to said framework, said framework including means for permitting substantial resilient deflection of said apexes inwardly toward said axis a distance of at least approximately 2 millimeters in response to hemodynamic pressure of approximately 2.3 psi. on said heart valve upon grafting of said heart valve in a heart, and return of said apexes to said predetermined distance from said axis upon removal of said hemodynamic pressure.
Claim 20
Dependent Claim
39 words
A device as recited in claim 17 in which, for said means for permitting said resilient deflection of said apical portions, said arms are twistable as torsion bars upon the application of said predetermined loading to said apical portions.
Claim 21
Dependent Claim
32 words
A device as recited in claim 18 in which said apical portions are relatively rigid so as to be substantially undistorted upon the application of said predetermined loading to said apical portions.
Claim 22
Dependent Claim
26 words
A device as recited in claim 17 including in addition a material selected from the group consisting of cloth or sponge means entirely covering said framework.
Claim 23
Dependent Claim
88 words
A device as recited in claim 17 including in addition a first material selected from the group consisting of cloth or sponge means, said material including an annular element extending over the marginal edge portion of said heart valve at said one end, said means for attaching said heart valve to said framework including sutures, said sutures extending through said material and said heart valve with loop portions of said sutures engaging said material for thereby preventing said sutures from pulling through the tissue of said heart valve.
Claim 24
Dependent Claim
54 words
A device as recited in claim 21 in which said material includes a sleeve entirely receiving said framework so as to provide an inner layer and an outer layer, and including an annular bead on the exterior of said outer layer intermediate the ends thereof for providing a means for attachment to a heart.
Claim 25
Dependent Claim
38 words
A device as recited in claim 22 in which said bead is integral with said outer layer, and including a ring of a second material selected form the group consisting of sponge or felt received in said bead.
Claim 26
Dependent Claim
36 words
A device as recited in claim 23 in which said first material includes padding between said layers at the locations of said apexes for protecting said sutures and said layers from being abraded by said framework.
Claim 27
Dependent Claim
24 words
A device as recited in claim 24 in which said padding includes a layer of felt on both sides of each of said apexes.
Claim 28
Dependent Claim
71 words
A device as recited in claim 17 including in addition a material selected from the group consisting of cloth or sponge means, said material including an uninterrupted sleeve entirely receiving said framework so as to provide an inner layer and an outer layer, and an integral generally flat uninterrupted annular flap at the end of said stent opposite from said one end for providing a means for attachment to a heart.
Claim 29
Dependent Claim
129 words
A heart valve assembly comprising a stent, said stent including a generally tubular framework having spaced apexes at one end and arms interconnecting said apexes, said arms being inclined away from said apexes at locations intermediate said apexes, a heart valve on said framework, said heart valve having commissures substantially at said apexes and cusps having marginal portions adjacent said arms, an annular member of material selected from the group consisting of cloth or sponge material overlying the marginal edge portion of said heart valve at said one end, and sutures extending through said annular member and said marginal edge portions for attaching said heart valve to said framework, said sutures having loop portions engaging said annular member for thereby protecting said heart valve from damage by said sutures.
Claim 30
Dependent Claim
129 words
A heart valve assembly comprising a stent, said stent including a generally tubular framework having spaced apexes at one end and arms interconnecting said apexes, said arms being inclined away from said apexes at locations intermediate said apexes, a heart valve on said framework, said heart valve having commissures substantially at said apexes and cusps having marginal portions adjacent said arms, an annular member of material selected from the group consisting of cloth or sponge material overlying the marginal edge portion of said heart valve at said one end, and sutures extending through said annular member and said marginal edge portions for attaching said heart valve to said framework, said sutures having loop portions engaging said annular member for thereby protecting said heart valve from damage by said sutures.
References Cited (Backward Citations)
US3197788A
Cited
US3570014A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |