US6306141B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Medical devices incorporating SIM alloy elements
Assignee: Medtronic Inc
•
Filing: 1995-06-07
•
Granted: 2001-10-23
•
Expires: 2015-06-07
Abstract
Abstract Medical devices which are currently proposed to use elements made from shape memory alloys may be improved by the use of stress-induced martensite alloy elements instead. The use of stress-induced martensite decreases the temperature sensitivity of the devices, thereby making them easier to install and/or remove.
Inventors
- 👤 James E. Jervis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:29
CPC Classifications
A; A61; A61C; A61C7/00; A61C7/12; A61B; A61B17/00; A61B17/064; A61B17/0642; A61B17/08; A61B17/56; A61B17/58; A61B17/68; A61B17/72; A61F; A61F2/00; A61F2/02; A61F2/24; A61F2/2409; A61F6/00; A61F6/06; A61F6/14; A61L; A61L27/00; A61L27/02; A61L27/04; A61L31/00; A61L31/02; A61L31/022; A61B2017/00831; A61B2017/00867; A61B2017/0647; A61B2017/0649; A61C2201/00; A61C2201/007; A61F2/01; A61F2/04; A61F2/06; A61F2/07; A61F2/30; A61F2002/30001; A61F2002/30003; A61F2002/3006; A61F2002/30092; A61F2210/00; A61F2210/0014; A61F2210/0019; A61L2400/00; A61L2400/16; A61L2430/00; A61L2430/02
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
223 words
A medical device for insertion into a mammalian body, the device comprising (a) a hollow placement device; (b) a memory alloy element formed at least partly from pseudoelastic shape-memory alloy, the alloy displaying reversible stress-induced martensite at about body temperature such that it has a stress-induced martensitic state and an austenitic state, the memory alloy element having (i) a deformed shape when the alloy is in its stress-induced martensitic state and (ii) a different unstressed shape when the alloy is in its austenitic state; and (c) a guide wire; the memory alloy element being within the hollow placement device, and the placement device being guidable by the guide wire, the hollow placement device stressing the memory alloy element at a temperature greater than the A s of the alloy so that the memory alloy element is in its deformed shape, wherein the memory alloy element can be extruded from the hollow placement device by the guide wire at a temperature greater than the A s of the alloy to transform at least a portion of the alloy from its stress-induced martensitic state so that the memory alloy element transforms from its deformed shape to its unstressed shape, and wherein the alloy is selected so that the transformation can occur without any change in temperature of the placement device or the memory alloy element.
Claim 2
Dependent Claim
223 words
A medical device for insertion into a mammalian body, the device comprising (a) a hollow placement device; (b) a memory alloy element formed at least partly from pseudoelastic shape-memory alloy, the alloy displaying reversible stress-induced martensite at about body temperature such that it has a stress-induced martensitic state and an austenitic state, the memory alloy element having (i) a deformed shape when the alloy is in its stress-induced martensitic state and (ii) a different unstressed shape when the alloy is in its austenitic state; and (c) a guide wire; the memory alloy element being within the hollow placement device, and the placement device being guidable by the guide wire, the hollow placement device stressing the memory alloy element at a temperature greater than the A s of the alloy so that the memory alloy element is in its deformed shape, wherein the memory alloy element can be extruded from the hollow placement device by the guide wire at a temperature greater than the A s of the alloy to transform at least a portion of the alloy from its stress-induced martensitic state so that the memory alloy element transforms from its deformed shape to its unstressed shape, and wherein the alloy is selected so that the transformation can occur without any change in temperature of the placement device or the memory alloy element.
Claim 3
Dependent Claim
13 words
The device of claim 1 wherein the memory alloy element is a stent.
Claim 4
Dependent Claim
17 words
The device of claim 2 , including a guide wire for endarterial placement of the stent graft.
Claim 5
Dependent Claim
19 words
The invention of claim 1 wherein the transformation occurs without any change in the state of the placement device.
Claim 6
Dependent Claim
14 words
The device of claim 1 , wherein the hollow placement device is a catheter.
Claim 7
Dependent Claim
126 words
A medical device which comprises: (a) a stent for endarterial placement within a human body so that the stent is substantially at human body temperature, the stent comprising a shape memory alloy which displays stress-induced martensite behavior at body temperature; and (b) a restraint holding the stent in a deformed configuration at a temperature less than the body temperature of the human for endarterial positioning of the stent within the human body in its deformed configuration, the deformation occurring through the formation of stress-induced martensite; wherein the stent is sufficiently deformed that when the stent is at human body temperature removal of the restraint from the stent, without change in temperature of the device, releases at least a portion of the stent from its deformed configuration.
Claim 8
Dependent Claim
126 words
A medical device which comprises: (a) a stent for endarterial placement within a human body so that the stent is substantially at human body temperature, the stent comprising a shape memory alloy which displays stress-induced martensite behavior at body temperature; and (b) a restraint holding the stent in a deformed configuration at a temperature less than the body temperature of the human for endarterial positioning of the stent within the human body in its deformed configuration, the deformation occurring through the formation of stress-induced martensite; wherein the stent is sufficiently deformed that when the stent is at human body temperature removal of the restraint from the stent, without change in temperature of the device, releases at least a portion of the stent from its deformed configuration.
Claim 9
Independent Claim
24 words
A device as claimed in 6 , in which the restraint is hollow, and the stent is positioned at least partially within the restraint.
Claim 10
Dependent Claim
17 words
A device as claimed in claim 6 or 7 , in which the restraint is a catheter.
Claim 11
Dependent Claim
44 words
A device as claimed in claim 6 or 7 , in which the stent has a transverse dimension and a longitudinal dimension, and wherein the stent is deformed by its transverse dimension being reduced, and wherein the restraint prevents transverse expansion of the stent.
Claim 12
Dependent Claim
46 words
The device of claim 6 , wherein the shape memory alloy element is sufficiently deformed that removal of the restraint from the shape memory alloy releases at least a portion of the shape alloy element from its deformed configuration without change in state of the restraint.
Claim 13
Dependent Claim
197 words
A medical device suitable for placement within a mammalian body for treatment of the mammalian body, the device comprising: (a) a stent formed at least partly from a pseudoelastic shape-memory alloy, the alloy having a reversible stress-induced martensitic state and an austenitic state, the memory alloy element having (i) a deformed shape when the alloy is in its stress-induced martensitic state and (ii) a different, unstressed shape; and (b) restraining means engaging and stressing the stent at a temperature less than the body temperature of the mammal and greater than the A s of the alloy for positioning the stent within the mammalian body while the stent is in its deformed shape; wherein the alloy is selected so that removal of the restraining means from the stent at a temperature greater than the A s of the alloy when the device is placed within the mammalian body, transforms at least a portion of the alloy from its stressed-induced martensitic state so that the stent transforms from its deformed relatively straightened shape towards its unstressed relatively coiled shape, without any change in temperature of the restraining means or the stent being required for the transformation of the alloy.
Claim 14
Dependent Claim
197 words
A medical device suitable for placement within a mammalian body for treatment of the mammalian body, the device comprising: (a) a stent formed at least partly from a pseudoelastic shape-memory alloy, the alloy having a reversible stress-induced martensitic state and an austenitic state, the memory alloy element having (i) a deformed shape when the alloy is in its stress-induced martensitic state and (ii) a different, unstressed shape; and (b) restraining means engaging and stressing the stent at a temperature less than the body temperature of the mammal and greater than the A s of the alloy for positioning the stent within the mammalian body while the stent is in its deformed shape; wherein the alloy is selected so that removal of the restraining means from the stent at a temperature greater than the A s of the alloy when the device is placed within the mammalian body, transforms at least a portion of the alloy from its stressed-induced martensitic state so that the stent transforms from its deformed relatively straightened shape towards its unstressed relatively coiled shape, without any change in temperature of the restraining means or the stent being required for the transformation of the alloy.
Claim 15
Dependent Claim
22 words
The device of claim 11 , wherein the transformation of the alloy occurs without any change in state of the restraining means.
Claim 16
Dependent Claim
12 words
The device of claim 11 wherein the restraining means is a catheter.
Claim 17
Dependent Claim
12 words
The device of claim 13 wherein the stent is within the catheter.
Claim 18
Dependent Claim
231 words
A medical device for treatment of a mammalian body, the device comprising: (a) a memory alloy stent formed at least partly from a pseudoelastic shape-memory alloy, the alloy displaying reversible stress-induced martensite at about the mammalian body temperature such that it has a stress-induced martensitic state and an austenitic state, the memory alloy stent having (i) a deformed relatively straightened shape when the alloy is in its stress-induced martensitic state and (ii) a different unstressed relatively coiled shape; and (b) a hollow restraining member with the memory alloy stent being within the restraining member, the restraining member engaging and stressing the memory alloy stent at a temperature less than the body temperature of the mammal and greater than the A s of the alloy for positioning the memory alloy stent within the human body while the memory alloy coil stent is in its deformed relatively straightened shape; wherein the restraining member and the memory alloy stent are movable relative to each other to transform at least a portion of the alloy from its stress-induced martensitic state at a temperature greater than the A s of the alloy so that the memory alloy element transforms from its deformed shape towards its unstressed relatively coiled shape, and wherein the alloy is selected so that the transformation can occur without any change in temperature of the restraining member or the memory alloy coil stent.
Claim 19
Dependent Claim
231 words
A medical device for treatment of a mammalian body, the device comprising: (a) a memory alloy stent formed at least partly from a pseudoelastic shape-memory alloy, the alloy displaying reversible stress-induced martensite at about the mammalian body temperature such that it has a stress-induced martensitic state and an austenitic state, the memory alloy stent having (i) a deformed relatively straightened shape when the alloy is in its stress-induced martensitic state and (ii) a different unstressed relatively coiled shape; and (b) a hollow restraining member with the memory alloy stent being within the restraining member, the restraining member engaging and stressing the memory alloy stent at a temperature less than the body temperature of the mammal and greater than the A s of the alloy for positioning the memory alloy stent within the human body while the memory alloy coil stent is in its deformed relatively straightened shape; wherein the restraining member and the memory alloy stent are movable relative to each other to transform at least a portion of the alloy from its stress-induced martensitic state at a temperature greater than the A s of the alloy so that the memory alloy element transforms from its deformed shape towards its unstressed relatively coiled shape, and wherein the alloy is selected so that the transformation can occur without any change in temperature of the restraining member or the memory alloy coil stent.
Claim 20
Dependent Claim
250 words
A medical device suitable for placement within a mammalian body for treatment of the mammalian body, the device comprising (i) a restraint, and (ii) a coil stent formed at least partly from a pseudoelastic shape-memory alloy, the alloy displaying reversible stress-induced martensite by virtue of being above its A s and above its M s and below its M d at about body temperature; such that it has a stress-induced martensitic state and an austenitic state, the element having (i) a relatively straightened shape when the alloy is in its stress-induced martensitic state and (ii) a different relatively coiled shape; wherein the restraint is (i) stressing the coil stent at a temperature less than the body temperature of the mammal for placement of the coil stent in its relatively straightened shape in the mammalian body and (ii) is capable of being at least partially removed from the coil stent while the coil stent is within the body at the body temperature and the coil stent is therefore at an operating temperature greater than the A s and M s and below the M d of the alloy, such removal of the restraint causing at least a portion of the alloy to transform from its stress-induced martensitic state to its austenitic state so that the coil stent spontaneously transforms from its relatively straightened shape towards its relatively coiled shape, and such transformation can occur without a change in temperature of the restraint or of the coil stent from the operating temperature.
Claim 21
Dependent Claim
250 words
A medical device suitable for placement within a mammalian body for treatment of the mammalian body, the device comprising (i) a restraint, and (ii) a coil stent formed at least partly from a pseudoelastic shape-memory alloy, the alloy displaying reversible stress-induced martensite by virtue of being above its A s and above its M s and below its M d at about body temperature; such that it has a stress-induced martensitic state and an austenitic state, the element having (i) a relatively straightened shape when the alloy is in its stress-induced martensitic state and (ii) a different relatively coiled shape; wherein the restraint is (i) stressing the coil stent at a temperature less than the body temperature of the mammal for placement of the coil stent in its relatively straightened shape in the mammalian body and (ii) is capable of being at least partially removed from the coil stent while the coil stent is within the body at the body temperature and the coil stent is therefore at an operating temperature greater than the A s and M s and below the M d of the alloy, such removal of the restraint causing at least a portion of the alloy to transform from its stress-induced martensitic state to its austenitic state so that the coil stent spontaneously transforms from its relatively straightened shape towards its relatively coiled shape, and such transformation can occur without a change in temperature of the restraint or of the coil stent from the operating temperature.
Claim 22
Dependent Claim
21 words
The device of claim 1 , 11 , 15 , or 16 , wherein the mammalian body is a human body.
Claim 23
Dependent Claim
138 words
A medical device comprising: (a) a wire stent formed at least partly from a pseudoelastic shape memory alloy, the alloy displaying reversible stress-induced martensite at about human body temperature such as it has a deformed shape when the alloy is in its stress-induced martensitic state and a different unstressed shape when the alloy is in its austenitic state; and (b) a restraint stressing the wire stent at a temperature greater than the A s of the alloy so that the wire stent is in its deformed shape, wherein the stent can be disengaged from the restraint upon placement in a human so that the stent transforms from its deformed shape to its unstressed shape, and wherein the alloy is selected so that the transformation can occur without any change in temperature of the restraint or the wire stent.
Claim 24
Dependent Claim
138 words
A medical device comprising: (a) a wire stent formed at least partly from a pseudoelastic shape memory alloy, the alloy displaying reversible stress-induced martensite at about human body temperature such as it has a deformed shape when the alloy is in its stress-induced martensitic state and a different unstressed shape when the alloy is in its austenitic state; and (b) a restraint stressing the wire stent at a temperature greater than the A s of the alloy so that the wire stent is in its deformed shape, wherein the stent can be disengaged from the restraint upon placement in a human so that the stent transforms from its deformed shape to its unstressed shape, and wherein the alloy is selected so that the transformation can occur without any change in temperature of the restraint or the wire stent.
Claim 25
Dependent Claim
24 words
The device of claim 6 , 11 , 15 , 16 or 18 , including a guide wire for endarterial placement of the stent.
Claim 26
Dependent Claim
26 words
The device of claim 15 , 16 , or 18 , wherein the transformation of the alloy occurs without any change in state of the restraint.
Claim 27
Dependent Claim
19 words
The device of claim 1 , 15 , 16 , or 18 , wherein the restraint is a catheter.
Claim 28
Dependent Claim
19 words
The device of claim 1 , 11 , 15 , or 18 wherein the stent is a coil stent.
References Cited (Backward Citations)
US3416531A
Cited
US3348548A
Cited
US3500820A
Cited
US3516412A
Cited
US3419010A
Cited
US3605725A
Cited
US3539033A
Cited
US3558369A
Cited
US3620212A
Cited
US4035007A
Cited
US3729008A
Cited
CA1001034A
Cited
US3740839A
Cited
US3789841A
Cited
US3889666A
Cited
US3857391A
Cited
US3757768A
Cited
US4037324A
Cited
US3868956A
Cited
US3786806A
Cited
US4198081A
Cited
US3890977A
Cited
US3939828A
Cited
US3960147A
Cited
US4080706A
Cited
US4033331A
Cited
GB1600000A
Cited
US4149911A
Cited
US4170990A
Cited
DE2703529A1
Cited
US4205293A
Cited
US4197593A
Cited
US4307723A
Cited
US4233690A
Cited
US4230123A
Cited
JPS5628980A
Cited
SU850067A1
Cited
US4310354A
Cited
US4401433A
Cited
JPS5710163A
Cited
JPS5775647A
Cited
SU940759A1
Cited
JPS5795452A
Cited
JPS57119744A
Cited
FR2529083A2
Cited
US4452236A
Cited
US4485816A
Cited
US4427000A
Cited
GB2106190A
Cited
JPS5825140A
Cited
JPS5829443A
Cited
JPS5841546A
Cited
JPS5844047A
Cited
JPS5850951A
Cited
US4425908A
Cited
US4411655A
Cited
US4601283A
Cited
GB2114005A
Cited
JPS58133225A
Cited
EP0102685A2
Cited
DE3225151A1
Cited
US4485805A
Cited
US4490112A
Cited
SU1110447A1
Cited
EP0105669A1
Cited
US4509517A
Cited
JPS5997115A
Cited
US4494531A
Cited
US4512338A
Cited
SU1113110A1
Cited
EP0129634A1
Cited
EP0132344A2
Cited
AU3086384A
Cited
JPS6045356A
Cited
US4925445A
Cited
US4586335A
Cited
EP0140621A1
Cited
US5190546A
Cited
JPS60100956A
Cited
EP0145166B1
Cited
US4505767A
Cited
US4665906A
Cited
US4543090A
Cited
US4556050A
Cited
US4616656A
Cited
JPS6476824A
Cited
JPH06220827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-10-22 | 2005-04-23 | 2005-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-10-22 | 2009-04-23 | 2009-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-10-22 | 2013-04-23 | 2013-10-23 | $7700.00 | Window Closed / Lapsed |