Patent US4769032A successfully refreshed from Google Patents.
US4769032A
Expired / Lapsed
US
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Prosthetic valve and monitoring system and method
Assignee: Individual
•
Filing: 1986-03-05
•
Granted: 1988-09-06
•
Expires: 2006-03-05
Abstract
Abstract A prosthetic heart valve which can be externally monitored is disclosed. In a first embodiment, the leaflets of the valve are magnetized, and the voltage induced in a coil juxtaposed thereto may be monitored. In a second embodiment, conductors are integrated with the leaflets. When the valve is then placed in a magnetic field, a voltage is induced in the conductors. The voltages induced in both valve configurations may be analyzed to indicate valve operation and conditions.
Inventors
- 👤 Bruce Steinberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:55
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/103; A61B5/11; A61F; A61F2/00; A61F2/02; A61F2/24; A61F2/2412; A61B5/68; A61B5/6846; A61B5/6867; A61B5/6869; Y; Y10; Y10S; Y10S623/00; Y10S623/90; Y10S623/902; Y10S623/904; Y10S623/912; Y10S623/913
Claims Analysis
Total Claims: 106
Claim 1
Independent Claim
90 words
Method of replacement of a heart valve of a patient with a prosthetic valve and of monitoring operation of the prosthetic valve, comprising the steps of: magnetizing one or more leaflets of a prosthetic valve; surgically replacing a dysfunctional heart valve or dysfunctional prosthetic valve with said prosthetic valve, said step of surgical replacing including the step of juxtaposing a coil of wire to the prosthetic valve; and monitoring the voltage induced in the coil of wire as a result of movement of the magnetized leaflets of the prosthetic valve.
Claim 2
Dependent Claim
90 words
Method of replacement of a heart valve of a patient with a prosthetic valve and of monitoring operation of the prosthetic valve, comprising the steps of: magnetizing one or more leaflets of a prosthetic valve; surgically replacing a dysfunctional heart valve or dysfunctional prosthetic valve with said prosthetic valve, said step of surgical replacing including the step of juxtaposing a coil of wire to the prosthetic valve; and monitoring the voltage induced in the coil of wire as a result of movement of the magnetized leaflets of the prosthetic valve.
Claim 3
Dependent Claim
14 words
The method of claim 1, wherein said coil is formed integrally with said valve.
Claim 4
Dependent Claim
28 words
The method of claim 2 wherein said coil is formed integrally with a base portion of said valve to which said one or more leaflets are pivotally attached.
Claim 5
Dependent Claim
17 words
The method of claim 1 wherein said valve is sutured to a vessel at its base portion.
Claim 6
Dependent Claim
13 words
The method of claim 1 wherein said leaflets are magnetized by ion implantation.
Claim 7
Dependent Claim
24 words
The method of claim 1, wherein said leaflets are magnetized by implantation of magnetized ion oxide pellets into one or more of said leaflets.
Claim 8
Dependent Claim
28 words
The method of claim 1 wherein said step of surgically replacing a dysfunctional heart valve includes the step of implanting signal conditioning and/or processing circuitry in the patient.
Claim 9
Dependent Claim
22 words
The method of claim 1 wherein said step of monitoring includes comparison of voltage signals derived from said coil with stored data.
Claim 10
Dependent Claim
17 words
The method of claim 8 wherein said stored data is data stored with respect to said patient.
Claim 11
Dependent Claim
29 words
As an article of manufacture, a prosthetic device comprising one or more magnetized leaflets, each of said one or more magnetized leaflets having at least one implanted magnetizing ion.
Claim 12
Dependent Claim
29 words
As an article of manufacture, a prosthetic device comprising one or more magnetized leaflets, each of said one or more magnetized leaflets having at least one implanted magnetizing ion.
Claim 13
Dependent Claim
38 words
The article of claim 10 further comprising a coil of wire located in a predetermined relation to said leaflets, said coil of wire having induced therein a voltage generated by movement of said one or more magnetized leaflets.
Claim 14
Dependent Claim
30 words
The article of claim 11 wherein said coil of wire is disposed in a base portion of said valve to which said one or more magnetized leaflets are pivotally mounted.
Claim 15
Dependent Claim
17 words
The article of claim 12 wherein said base portion is adapted to be sutured to a vessel.
Claim 16
Dependent Claim
55 words
In combination: a prosthetic heart valve having one or more magnetized leaflets; a coil of wire juxtaposed to said valve in order to have a voltage induced therein as a result of movement of said magnetized leaflets; and a diagnostic device adapted to be connected to said coil and to analyze the voltages induced therein.
Claim 17
Dependent Claim
55 words
In combination: a prosthetic heart valve having one or more magnetized leaflets; a coil of wire juxtaposed to said valve in order to have a voltage induced therein as a result of movement of said magnetized leaflets; and a diagnostic device adapted to be connected to said coil and to analyze the voltages induced therein.
Claim 18
Dependent Claim
16 words
The combination of claim 14 wherein said coil of wire is formed integrally with said valve.
Claim 19
Dependent Claim
26 words
The combination of claim 15 wherein said coil of wire is formed within a base portion of said valve to which said leaflets are pivotally attached.
Claim 20
Dependent Claim
20 words
The combination of claim 16 wherein said base portion of said valve is adapted to be sutured to a vessel.
Claim 21
Dependent Claim
20 words
The combination of claim 14 further comprising signal processing means adapted to be implanted in the body of a patient.
Claim 22
Dependent Claim
22 words
The combination of claim 14 wherein said diagnostic device comprises means for comparing voltages induced in said coil with stored comparison data.
Claim 23
Dependent Claim
39 words
The combination of claim 19 further comprising additional physiological monitoring devices and wherein said diagnostic device comprises means for comparing voltages induced in said coil with data produced by said additional physiological monitoring devices and with stored comparison data.
Claim 24
Dependent Claim
23 words
The combination of either of claims 19 and 20 wherein said stored comparison data is derived from a particular patient for subsequent comparison.
Claim 25
Dependent Claim
22 words
The combination of claim 14, further comprising oscilloscope means for providing a visible display responsive to the voltage induced in said coil.
Claim 26
Dependent Claim
20 words
The combination of claim 14 further comprising means responsive to said diagnostic device for providing an assessment of valve condition.
Claim 27
Dependent Claim
88 words
Method of replacement of a heart valve of a patient with a prosthetic valve and of monitoring operation of the prosthetic valve, comprising the steps of: attaching one or more conductors to one or more leaflets of a prosthetic valve; surgically replacing a dysfunctional heart valve or dysfunctional prosthetic value with said prosthetic valve; directing a magnetic field through the prosthetic valve; and monitoring the voltage induced in said one or more conductors as a result of movement of said one or more leaflets of the prosthetic valve.
Claim 28
Dependent Claim
88 words
Method of replacement of a heart valve of a patient with a prosthetic valve and of monitoring operation of the prosthetic valve, comprising the steps of: attaching one or more conductors to one or more leaflets of a prosthetic valve; surgically replacing a dysfunctional heart valve or dysfunctional prosthetic value with said prosthetic valve; directing a magnetic field through the prosthetic valve; and monitoring the voltage induced in said one or more conductors as a result of movement of said one or more leaflets of the prosthetic valve.
Claim 29
Dependent Claim
22 words
The method of claim 24 wherein said magnetic field is produced by a magnetic field generated within the body of the patient.
Claim 30
Dependent Claim
19 words
The method of claim 24 wherein said magnetic field is produced by means outside the body of the patient.
Claim 31
Dependent Claim
19 words
The method of claim 24 wherein said valve comprises a base portion adapted to be sutured to a vessel.
Claim 32
Dependent Claim
19 words
The method of claim 24 wherein said conductors are formed on said leaflets by implantation thereof with conductive ions.
Claim 33
Dependent Claim
11 words
The method of claim 24 wherein said conductors are discrete wires.
Claim 34
Dependent Claim
28 words
The method of claim 24 wherein said step of surgically replacing a dysfunctional heart valve includes the step of implanting signal conditioning and processing circuitry in the patient.
Claim 35
Dependent Claim
24 words
The method of claim 24 wherein said step of monitoring includes comparison of signals derived from said one or more conductors with stored data.
Claim 36
Dependent Claim
17 words
The method of claim 31 wherein said stored data is data stored with respect to said patient.
Claim 37
Dependent Claim
46 words
As an article of manufacture, a prosthetic heart valve comprising one or more leaflets, each having one or more electrical conductors formed thereon, said one or more electrical conductors adapted for connection in a circuit loop for allowing an induced detectable voltage to be formed therein.
Claim 38
Dependent Claim
46 words
As an article of manufacture, a prosthetic heart valve comprising one or more leaflets, each having one or more electrical conductors formed thereon, said one or more electrical conductors adapted for connection in a circuit loop for allowing an induced detectable voltage to be formed therein.
Claim 39
Dependent Claim
16 words
The article of claim 33 wherein said conductors are formed on said leaflets by implanted ions.
Claim 40
Dependent Claim
20 words
The article of claim 34 wherein said leaflets pivot on a base portion adapted to be sutured to a vessel.
Claim 41
Dependent Claim
47 words
In combination: a prosthetic heart valve comprising one or more leaflets each having one or more conductors integrated therewith; means for generating a magnetic field passing through said valve; and a diagnostic device adapted to be connected to said conductors and to analyze the voltages induced therein.
Claim 42
Dependent Claim
47 words
In combination: a prosthetic heart valve comprising one or more leaflets each having one or more conductors integrated therewith; means for generating a magnetic field passing through said valve; and a diagnostic device adapted to be connected to said conductors and to analyze the voltages induced therein.
Claim 43
Dependent Claim
27 words
The combination of claim 36 wherein said magnetic field is produced by coils within the confines of the body of a patient and juxtaposed to the valve.
Claim 44
Dependent Claim
23 words
The combination of claim 36 wherein said magnetic field is produced by coils outside of the confines of the body of a patient.
Claim 45
Dependent Claim
19 words
The combination of claim 38 wherein said valve comprises a base portion adapted to be sutured to a vessel.
Claim 46
Dependent Claim
18 words
The combination of claim 36 wherein said conductors are formed by implantation of conductive ions on said leaflets.
Claim 47
Dependent Claim
17 words
The combination of claim 36 wherein said conductors are discrete wires which are integrated into said leaflets.
Claim 48
Dependent Claim
20 words
The combination of claim 36 further comprising signal processing means adapted to be implanted in the body of a patient.
Claim 49
Dependent Claim
22 words
The combination of claim 36 wherein said diagnostic device comprises means for comparing voltages induced in said conductors with stored comparison data.
Claim 50
Dependent Claim
19 words
The combination of claim 43 wherein said stored comparison data is derived from a particular patient for subsequent comparison.
Claim 51
Dependent Claim
32 words
The combination of claim 43 wherein said diagnostic device further comprises additional physiological monitoring devices and comprises means for analyzing voltages induced in said coil using signals produced by said additional devices.
Claim 52
Dependent Claim
22 words
The combination of claim 36 further comprising oscilloscope means for providing a visible display responsive to the voltage induced in said conductors.
Claim 53
Dependent Claim
20 words
The combination of claim 46 further comprising means responsive to said diagnostic device for generating an assessment of valve condition.
Claim 54
Dependent Claim
52 words
A prosthetic heart valve, comprising: one or more magnetized leaflets adapted to move responsive to passage of blood through said valve; and a signal generation means for generating a detectable signal responsive to motion of said one or more leaflets, wherein said signal generation means is a conductor juxtaposed to said leaflets.
Claim 55
Dependent Claim
52 words
A prosthetic heart valve, comprising: one or more magnetized leaflets adapted to move responsive to passage of blood through said valve; and a signal generation means for generating a detectable signal responsive to motion of said one or more leaflets, wherein said signal generation means is a conductor juxtaposed to said leaflets.
Claim 56
Dependent Claim
58 words
A prosthetic heart valve, comprising: one or more magnetized leaflets adapted to move responsive to passage of blood through said valve; and a signal generation means for generating a detectable signal responsive to motion of said one or more leaflets, wherein said signal generation means is a conductor juxtaposed to said leaflets and said conductor is a coil.
Claim 57
Dependent Claim
58 words
A prosthetic heart valve, comprising: one or more magnetized leaflets adapted to move responsive to passage of blood through said valve; and a signal generation means for generating a detectable signal responsive to motion of said one or more leaflets, wherein said signal generation means is a conductor juxtaposed to said leaflets and said conductor is a coil.
Claim 58
Dependent Claim
92 words
A prosthetic heart valve, comprising: one or more magnetized leaflets adapted to move responsive to passage of blood through said valve, and said magnetized leaflets are pivotally mounted to a generally circular based portion of said valve, adapted to be sutured to a vein; and a signal generation means for generating a detectable signal responsive to motion of said one or more leaflets, wherein said signal generation means is a conductor juxtaposed to said leaflets, said conductor is a coil and said coil is disposed around said base portion of said valve.
Claim 59
Dependent Claim
92 words
A prosthetic heart valve, comprising: one or more magnetized leaflets adapted to move responsive to passage of blood through said valve, and said magnetized leaflets are pivotally mounted to a generally circular based portion of said valve, adapted to be sutured to a vein; and a signal generation means for generating a detectable signal responsive to motion of said one or more leaflets, wherein said signal generation means is a conductor juxtaposed to said leaflets, said conductor is a coil and said coil is disposed around said base portion of said valve.
Claim 60
Dependent Claim
64 words
A prosthetic heart valve comprising: one or more leaflets adapted to move responsive to passage of blood through said valve, wherein said one or more leaflets comprise conductors; and a signal generation means for generating a detectable signal responsive to motion of said one or more leaflets and said signal generation means comprises means for applying a magnetic field to said valve in operation.
Claim 61
Dependent Claim
64 words
A prosthetic heart valve comprising: one or more leaflets adapted to move responsive to passage of blood through said valve, wherein said one or more leaflets comprise conductors; and a signal generation means for generating a detectable signal responsive to motion of said one or more leaflets and said signal generation means comprises means for applying a magnetic field to said valve in operation.
Claim 62
Dependent Claim
81 words
A prosthetic heart valve comprising: one or more leaflets adapted to move responsive to passage of blood through said valves, said one or more leaflets comprise conductors and said conductors are formed by implanted conductive ions in the surface of the one or more leaflets; and a signal generation means for generating a detectable signal responsive to motion of said one or more leaflets and said signal generation means comprises means for applying a magnetic field to said valve in operation.
Claim 63
Dependent Claim
81 words
A prosthetic heart valve comprising: one or more leaflets adapted to move responsive to passage of blood through said valves, said one or more leaflets comprise conductors and said conductors are formed by implanted conductive ions in the surface of the one or more leaflets; and a signal generation means for generating a detectable signal responsive to motion of said one or more leaflets and said signal generation means comprises means for applying a magnetic field to said valve in operation.
Claim 64
Dependent Claim
70 words
A prosthetic heart vale, comprising: one or more leaflets adapted to move responsive to passage of blood through said valve, said leaflets comprise conductors and said conductors comprise wires surgically integrated with said leaflets; and a signal generation means for generating a detectable signal responsive to motion of said one or more leaflets and said signal generation means comprises means for applying a magnetic field for said valve in operation.
Claim 65
Dependent Claim
70 words
A prosthetic heart vale, comprising: one or more leaflets adapted to move responsive to passage of blood through said valve, said leaflets comprise conductors and said conductors comprise wires surgically integrated with said leaflets; and a signal generation means for generating a detectable signal responsive to motion of said one or more leaflets and said signal generation means comprises means for applying a magnetic field for said valve in operation.
Claim 66
Dependent Claim
74 words
A prosthetic heart valve comprising: one or more leaflets adapted to move responsive to passage of blood through said valve, wherein said one or more leaflets comprise conductors; and a signal generation means for generating a detectable signal responsive to motion of said one or more leaflets, said signal generation means comprises means for applying a magnetic field to said valve in operation, and said means for applying the magnetic field is surgically implantable.
Claim 67
Dependent Claim
74 words
A prosthetic heart valve comprising: one or more leaflets adapted to move responsive to passage of blood through said valve, wherein said one or more leaflets comprise conductors; and a signal generation means for generating a detectable signal responsive to motion of said one or more leaflets, said signal generation means comprises means for applying a magnetic field to said valve in operation, and said means for applying the magnetic field is surgically implantable.
Claim 68
Dependent Claim
91 words
A prosthetic heart valve comprising: one or more leaflets adapted to move responsive to passage of blood through said valves, said one or more leaflets comprise conductors and said conductors are formed by implanted conductive ions in the surface of the one or more leaflets; and a signal generation means for generating a detectable signal responsive to motion of said one or more leaflets, said signal generation means comprises means for applying a magnetic field to said valve in operation, and said means for applying the magnetic field is surgically implantable.
Claim 69
Dependent Claim
91 words
A prosthetic heart valve comprising: one or more leaflets adapted to move responsive to passage of blood through said valves, said one or more leaflets comprise conductors and said conductors are formed by implanted conductive ions in the surface of the one or more leaflets; and a signal generation means for generating a detectable signal responsive to motion of said one or more leaflets, said signal generation means comprises means for applying a magnetic field to said valve in operation, and said means for applying the magnetic field is surgically implantable.
Claim 70
Dependent Claim
80 words
A prosthetic heart valve, comprising: one or more leaflets adapted to move responsive to passage of blood through said valve, said leaflets comprise conductors and said conductors comprise wires surgically integrated with said leaflets; and a signal generator means for generating a detectable signal responsive to motion of said one or more leaflets, said signal generation means comprises means for applying a magnetic field for said valve in operation, and said means for applying the magnetic field is surgically implantable.
Claim 71
Dependent Claim
80 words
A prosthetic heart valve, comprising: one or more leaflets adapted to move responsive to passage of blood through said valve, said leaflets comprise conductors and said conductors comprise wires surgically integrated with said leaflets; and a signal generator means for generating a detectable signal responsive to motion of said one or more leaflets, said signal generation means comprises means for applying a magnetic field for said valve in operation, and said means for applying the magnetic field is surgically implantable.
Claim 72
Dependent Claim
42 words
A prosthetic heart valve comprising one or more leaflets, each of said one or more leaflets comprising magnetic material to induce a current; and a conductor located in predetermined relation to said leaflets, for allowing said induced current to be formed therein.
Claim 73
Dependent Claim
42 words
A prosthetic heart valve comprising one or more leaflets, each of said one or more leaflets comprising magnetic material to induce a current; and a conductor located in predetermined relation to said leaflets, for allowing said induced current to be formed therein.
Claim 74
Dependent Claim
28 words
The article of claim 57 wherein said conductor is disposed in a base portion of said valve to which said one or more magnetized leaflets are pivotally mounted.
Claim 75
Dependent Claim
17 words
The article of claim 58 wherein said base portion is adapted to be sutured to a vessel.
Claim 76
Independent Claim
73 words
A method of monitoring the operation of a prosthetic valve in the body, comprising the steps of: implanting said prosthetic valve into the body, said prosthetic valve having one or more magnetized leaflets and at least one conductor for allowing a voltage to be induced therein due to relative movement with respect to the magnetized leaflets; and monitoring the voltage induced in said at least one conductor as a result of such movement.
Claim 77
Independent Claim
73 words
A method of monitoring the operation of a prosthetic valve in the body, comprising the steps of: implanting said prosthetic valve into the body, said prosthetic valve having one or more magnetized leaflets and at least one conductor for allowing a voltage to be induced therein due to relative movement with respect to the magnetized leaflets; and monitoring the voltage induced in said at least one conductor as a result of such movement.
Claim 78
Dependent Claim
17 words
The method of claim 60, wherein said at least one conductor is formed integrally with said valve.
Claim 79
Dependent Claim
31 words
The method of claim 61, wherein said at least one conductor is formed integrally with a base portion of said valve to which said one or more leaflets are pivotally attached.
Claim 80
Dependent Claim
18 words
The method of claim 60, wherein said prosthetic valve is sutured to a vessel at its base portion.
Claim 81
Dependent Claim
13 words
The method of claim 60, wherein said leaflets are magnetized by ion implantation.
Claim 82
Dependent Claim
21 words
The method of claim 60, wherein said one or more magnetized leaflets are magnetized by implantation of magnetized iron oxide pellets.
Claim 83
Dependent Claim
24 words
The method of claim 60, wherein said step of implanting further includes the step of implanting signal conditioning and/or processing circuitry in the patient.
Claim 84
Dependent Claim
25 words
The method of claim 60, wherein the step of monitoring includes comparison of voltage signals derived from said at least one conductor with stored data.
Claim 85
Dependent Claim
17 words
The method of claim 67, wherein said stored data is data stored with respect to said patient.
Claim 86
Independent Claim
71 words
An apparatus for monitoring the operation of a prosthetic valve in the body, comprising: means for implanting said prosthetic valve into the body, said prosthetic valve having one or more magnetized leaflets and at least one conductor for allowing a voltage to be induced therein due to relative movement with respect to the magnetized leaflets; and means for monitoring the voltage induced in the conductors as a result of such movement.
Claim 87
Independent Claim
71 words
An apparatus for monitoring the operation of a prosthetic valve in the body, comprising: means for implanting said prosthetic valve into the body, said prosthetic valve having one or more magnetized leaflets and at least one conductor for allowing a voltage to be induced therein due to relative movement with respect to the magnetized leaflets; and means for monitoring the voltage induced in the conductors as a result of such movement.
Claim 88
Dependent Claim
17 words
The apparatus of claim 69, wherein said at least one conductor is formed integrally with said valve.
Claim 89
Dependent Claim
31 words
The apparatus of claim 70, wherein said at least one conductor is formed integrally with a base portion of said valve, to which said one or more leaflets are pivotally attached.
Claim 90
Dependent Claim
17 words
The apparatus of claim 69, wherein said valve is sutured to a vessel at its base portion.
Claim 91
Dependent Claim
16 words
The apparatus of claim 69, wherein said leaflets are implanted with at least one magnetized ion.
Claim 92
Dependent Claim
22 words
The apparatus of claim 69, wherein said one or more magnetized leaflets are implanted with at least one magnetized iron oxide pellet.
Claim 93
Dependent Claim
21 words
The apparatus of claim 69, wherein said prosthetic valve further includes means for signal conditioning and/or processing circuitry in the patient.
Claim 94
Dependent Claim
27 words
The apparatus of claim 69, wherein said means for monitoring includes means for comparison of voltage signals derived from said at least one conductor with stored data.
Claim 95
Dependent Claim
17 words
The apparatus of claim 76, wherein said stored data is data stored with respect to said patient.
Claim 96
Dependent Claim
48 words
A prosthetic valve comprising: one or more leaflets; a first portion containing magnetized material; a second portion containing at least one conductor; and said first or second portions being carried by said leaflets causing relative movement so as to induce a voltage in said at least one conductor.
Claim 97
Dependent Claim
48 words
A prosthetic valve comprising: one or more leaflets; a first portion containing magnetized material; a second portion containing at least one conductor; and said first or second portions being carried by said leaflets causing relative movement so as to induce a voltage in said at least one conductor.
Claim 98
Dependent Claim
18 words
The apparatus of claim 78, wherein said conductor or magnetized material is formed integrally with said prosthetic valve.
Claim 99
Dependent Claim
32 words
The apparatus of claim 79, wherein said conductor or magnetized material is formed integrally with a base portion of said prosthetic valve, to which said one or more leaflets are pivotally attached.
Claim 100
Dependent Claim
18 words
The apparatus of claim 78, wherein said prosthetic valve is sutured to a vessel at its base portion.
Claim 101
Dependent Claim
16 words
The apparatus of claim 78, wherein said one or more leaflets are magnetized by implanted ions.
Claim 102
Dependent Claim
19 words
The apparatus of claim 78, wherein said one or more leaflets are magnetized by implanted magnetized iron oxide pellets.
Claim 103
Dependent Claim
17 words
The apparatus of claim 78, further comprising means for signal conditioning and/or processing circuitry in the patient.
Claim 104
Dependent Claim
19 words
The apparatus of claim 78, further comprising means for monitoring the voltage induced in said at least one conductor.
Claim 105
Dependent Claim
28 words
The apparatus of claim 85, wherein said means for monitoring further includes means for comparison with said voltage derived from said at least one conductor with stored data.
Claim 106
Dependent Claim
16 words
The method of claim 86, wherein stored data is data stored with respect to said patient.
References Cited (Backward Citations)
US3197788A
Cited
US3487826A
Cited
US3516399A
Cited
US3529591A
Cited
US3696674A
Cited
US3959827A
Cited
US4038703A
Cited
US4245358A
Cited
US4349498A
Cited
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| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |