US5562714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic field strength regulator for implant
Assignee: Medtronic Inc
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Filing: 1995-02-03
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Granted: 1996-10-08
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Expires: 2015-02-03
Abstract
Abstract An efficient low cost means for regulating the output level of a magnetic field transmitter. A feedback coil tightly coupled to an output coil is designed to produce an output voltage just above the supply level for the output stage of the transmitter when the desired output level is achieved. The feedback sense coil tightly coupled to an output coil is designed to produce an output voltage just above a regulated power supply level for the output stage of the transmitting antenna until a desired output level is achieved. The feedback coil is diode coupled to the regulated power supply lines of the transmitter. When the output level increases above the regulation level the diodes begin to conduct returning energy to the supply and preventing further increase of the transmitting antenna signal.
Inventors
- 👤 John J. Grevious
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:49
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/18; A61N1/32; A61N1/36; A61N1/372; A61N1/37211; A61N1/37217; A61N1/37223
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
95 words
A medical device system, comprising: an implantable medical device having a receiving antenna; an external programmer means for transmitting information to a pacemaker including a transmitter, said transmitter in turn comprising: a transmitting antenna; means for supplying a radio frequency signal to said transmitting antenna to cause generation of a magnetic field; means for sensing strength of said magnetic field; and means responsive to said sensing means for variably loading said magnetic field to regulate said magnetic field strength, said loading means loads said magnetic field to restrict said field to a predetermined maximum level.
Claim 2
Dependent Claim
95 words
A medical device system, comprising: an implantable medical device having a receiving antenna; an external programmer means for transmitting information to a pacemaker including a transmitter, said transmitter in turn comprising: a transmitting antenna; means for supplying a radio frequency signal to said transmitting antenna to cause generation of a magnetic field; means for sensing strength of said magnetic field; and means responsive to said sensing means for variably loading said magnetic field to regulate said magnetic field strength, said loading means loads said magnetic field to restrict said field to a predetermined maximum level.
Claim 3
Dependent Claim
20 words
A system according to claim 1, wherein said loading means loads said magnetic field to maintain a constant magnetic field.
Claim 4
Dependent Claim
19 words
A system according to claim 1, wherein said loading means comprises means for regulating Q of said transmitting antenna.
Claim 5
Dependent Claim
51 words
A system according to claim 3 wherein said sensing means comprises a sensing antenna having an electrical connection through diodes to a power supply so that the Q of said transmitting antenna is regulated by draw down of energy by said sense antenna through said diode connection to said power supply.
Claim 6
Dependent Claim
111 words
A medical device system, comprising: an implantable medical device having a receiving antenna; an external programmer means for transmitting information to a pacemaker including a transmitter, said transmitter in turn comprising: a transmitting antenna; means for supplying a radio frequency signal to said transmitting antenna to cause generation of a magnetic field; means for sensing strength of said magnetic field, said sensing means further comprises a sensing antenna; and means responsive to said sensing means for variably loading said magnetic field to regulate said magnetic field strength, said loading means further comprises means for allowing current flow through said sensing antenna in response to said magnetic field reaching a predetermined level.
Claim 7
Dependent Claim
111 words
A medical device system, comprising: an implantable medical device having a receiving antenna; an external programmer means for transmitting information to a pacemaker including a transmitter, said transmitter in turn comprising: a transmitting antenna; means for supplying a radio frequency signal to said transmitting antenna to cause generation of a magnetic field; means for sensing strength of said magnetic field, said sensing means further comprises a sensing antenna; and means responsive to said sensing means for variably loading said magnetic field to regulate said magnetic field strength, said loading means further comprises means for allowing current flow through said sensing antenna in response to said magnetic field reaching a predetermined level.
Claim 8
Dependent Claim
84 words
A programmer for transmitting information to an implantable medical device by means of a transmitter, said transmitter in turn comprising: a transmitting antenna; means for supplying a radio frequency signal to said transmitting antenna to cause generation of a magnetic field; means for sensing strength of said magnetic field: and means responsive to said sensing means for variable loading said magnetic field to regulate said magnetic field strength, said loading means loads said magnetic field to restrict said field to a predetermined maximum level.
Claim 9
Dependent Claim
84 words
A programmer for transmitting information to an implantable medical device by means of a transmitter, said transmitter in turn comprising: a transmitting antenna; means for supplying a radio frequency signal to said transmitting antenna to cause generation of a magnetic field; means for sensing strength of said magnetic field: and means responsive to said sensing means for variable loading said magnetic field to regulate said magnetic field strength, said loading means loads said magnetic field to restrict said field to a predetermined maximum level.
Claim 10
Dependent Claim
20 words
A programmer according to claim 6, wherein said loading means loads said magnetic field to maintain a constant magnetic field.
Claim 11
Dependent Claim
19 words
A programmer according to claim 6, wherein said loading means comprises means for regulating Q of said transmitting antenna.
Claim 12
Dependent Claim
18 words
A programmer according to claim 6, wherein said sensing means comprises a sensing antenna reaching a predetermined level.
Claim 13
Dependent Claim
99 words
A programmer for transmitting information to an implantable medical device by means of a transmitter, said transmitter in turn comprising: a transmitting antenna; means for supplying a radio frequency signal to said transmitting antenna to cause generation of a magnetic field; means for sensing strength of said magnetic field, said sensing means further comprises a sensing antenna; and means responsive to said sensing means for variably loading said magnetic field to regulate said magnetic field strength, said loading means comprises means for allowing current flow through said sensing antenna in response to said magnetic field reaching a predetermined level.
Claim 14
Dependent Claim
99 words
A programmer for transmitting information to an implantable medical device by means of a transmitter, said transmitter in turn comprising: a transmitting antenna; means for supplying a radio frequency signal to said transmitting antenna to cause generation of a magnetic field; means for sensing strength of said magnetic field, said sensing means further comprises a sensing antenna; and means responsive to said sensing means for variably loading said magnetic field to regulate said magnetic field strength, said loading means comprises means for allowing current flow through said sensing antenna in response to said magnetic field reaching a predetermined level.
Claim 15
Dependent Claim
62 words
A transmitter system for use in a programmer useful to communicate with an implantable medical device comprising: a transmitting antenna; a power supply means connected via an amplifier to provide power to encoded signal for transmission by said transmitting antenna, secondary antenna means for receiving transmission by said transmitting antenna and for controlling Q of said transmitting antenna by absorbing transmitted power.
Claim 16
Dependent Claim
62 words
A transmitter system for use in a programmer useful to communicate with an implantable medical device comprising: a transmitting antenna; a power supply means connected via an amplifier to provide power to encoded signal for transmission by said transmitting antenna, secondary antenna means for receiving transmission by said transmitting antenna and for controlling Q of said transmitting antenna by absorbing transmitted power.
Claim 17
Dependent Claim
20 words
A transmitter system as set forth in claim 11 wherein said absorbed transmitted power is shunted to said power supply.
Claim 18
Dependent Claim
27 words
A transmitter as set forth in claim 11 wherein said absorbed transmitted power is supplied to said power supply means through connection thereto via a diode means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-10-08 | 2000-04-08 | 2000-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-10-08 | 2004-04-08 | 2004-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-10-08 | 2008-04-08 | 2008-10-08 | $7700.00 | Window Closed / Lapsed |