US6324431B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transcutaneous energy transfer device with magnetic field protected components in secondary coil
Assignee: Abiomed Inc
•
Filing: 1999-07-02
•
Granted: 2001-11-27
•
Expires: 2019-07-02
Abstract
Abstract The invention provides a transcutaneous energy transfer device having an external primary coil and an implanted secondary coil inductively coupled to the primary coil, electronic components subcutaneously mounted within the secondary coil and a mechanism which reduces inductive heating of such components by the magnetic field of the secondary coil. For one embodiment of the invention, the mechanism for reducing inductive heating includes a cage formed of a high magnetic permeability material in which the electronic components are mounted, which cage guides the flux around the components to prevent heating thereof. For an alternative embodiment of the invention, a secondary coil has an outer winding and either a counter-wound inner winding or an inner winding in the magnetic field of the outer winding. For either arrangement of the inner coil, the inner coil generates a magnetic field substantially canceling the magnetic field of the outer coil in the area in which the electronic components are mounted.
Inventors
- 👤 Farhad Zarinetchi
- 👤 Robert M. Hart
- 👤 Michael G. Verga
- 👤 Stephen J. Keville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:00
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/372; A61N1/378; A61N1/3787
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
100 words
A transcutaneous energy transfer device comprising: an external primary coil adapted to receive an alternating drive signal for generating a magnetic field; an implantable secondary coil having mounted therein electronic components, said secondary coil for inducing a current when said secondary coil is inductively coupled to said primary coil, said induced current in said secondary coil generating a magnetic field; and a cage formed of a magnetically permeable material enclosing said electronic components to reduce inductive heating of said electronic components caused by the magnetic field of said primary and secondary coils; wherein said cage has walls of varying thickness.
Claim 2
Dependent Claim
100 words
A transcutaneous energy transfer device comprising: an external primary coil adapted to receive an alternating drive signal for generating a magnetic field; an implantable secondary coil having mounted therein electronic components, said secondary coil for inducing a current when said secondary coil is inductively coupled to said primary coil, said induced current in said secondary coil generating a magnetic field; and a cage formed of a magnetically permeable material enclosing said electronic components to reduce inductive heating of said electronic components caused by the magnetic field of said primary and secondary coils; wherein said cage has walls of varying thickness.
Claim 3
Dependent Claim
43 words
The transcutaneous energy transfer device of claim 1 , wherein the thickness of said walls is such that a lowest total mass is achieved while the strength of said magnetic fields in said walls is below a saturation density of said cage material.
Claim 4
Dependent Claim
40 words
The transcutaneous energy transfer device of claim 2 , wherein said thickness of said cage walls is a minimum thickness such that magnetic flux density of said magnetic fields through said cage walls is approximately equal to said saturation density.
Claim 5
Dependent Claim
22 words
The transcutaneous energy transfer device of claim 1 , wherein the material has high magnetic permeability in the range of approximately 2000-5000.
Claim 6
Dependent Claim
15 words
The transcutaneous energy transfer device of claim 1 , wherein the material is a ferrite.
Claim 7
Dependent Claim
15 words
The transcutaneous energy transfer device of claim 1 , wherein the material is laminated iron.
Claim 8
Dependent Claim
26 words
The transcutaneous energy transfer device of claim 1 , wherein sidewalls of said cage are thicker than a top wall and bottom wall of said cage.
Claim 9
Dependent Claim
31 words
The transcutaneous energy transfer device of claim 7 , wherein the strength of said magnetic fields in said cage is greater in said sidewalls than in said top and bottom walls.
Claim 10
Dependent Claim
96 words
A transcutaneous energy transfer device comprising: an external primary coil adapted to receive an alternating drive signal for generating a magnetic field; an implantable housing; a secondary coil contained within said implantable housing, said secondary coil having mounted therein electronic components, said secondary coil for inducing a current when said secondary coil is inductively coupled to said primary coil; a cage formed of a magnetically permeable material enclosing said electronic components, said cage having walls of varying thickness; and a heat distribution layer thermally coupled to said cage and to an internal surface of said housing.
Claim 11
Dependent Claim
96 words
A transcutaneous energy transfer device comprising: an external primary coil adapted to receive an alternating drive signal for generating a magnetic field; an implantable housing; a secondary coil contained within said implantable housing, said secondary coil having mounted therein electronic components, said secondary coil for inducing a current when said secondary coil is inductively coupled to said primary coil; a cage formed of a magnetically permeable material enclosing said electronic components, said cage having walls of varying thickness; and a heat distribution layer thermally coupled to said cage and to an internal surface of said housing.
Claim 12
Dependent Claim
27 words
The transcutaneous energy transfer device of claim 9 , wherein said heat distribution layer is comprised of multiple alternating layers of high and low heat conductivity materials.
Claim 13
Dependent Claim
25 words
The transcutaneous energy transfer device of claim 9 , wherein the material of said cage has high magnetic permeability in the range of approximately 2000-5000.
Claim 14
Dependent Claim
34 words
The transcutateous energy transfer device of claim 9 , wherein said housing is formed from a material having a thermal conductivity so as to provide a substantially uniform distribution of heat along the housing.
References Cited (Backward Citations)
US3195540A
Cited
US3357434A
Cited
US3888260A
Cited
US3824129A
Cited
US3942535A
Cited
US3934177A
Cited
US4068292A
Cited
US4012769A
Cited
US4041955A
Cited
US4071032A
Cited
DE2720011A1
Cited
US4104701A
Cited
US4186749A
Cited
US4441498A
Cited
US4517585A
Cited
US4539433A
Cited
US4586508A
Cited
US4741339A
Cited
US4679560A
Cited
US4665896A
Cited
US5000178A
Cited
US5214392A
Cited
US4944299A
Cited
EP0507360A2
Cited
US5312439A
Cited
US5324316A
Cited
US5358514A
Cited
JPH0746164A
Cited
US5411537A
Cited
US5527348A
Cited
US5621369A
Cited
US6048601A
Cited
US5951459A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-11-26 | 2005-05-28 | 2005-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-11-26 | 2009-05-28 | 2009-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-11-26 | 2013-05-28 | 2013-11-27 | $7700.00 | Window Closed / Lapsed |