WO2002068046B1 - Mems switching circuit and method for an implantable medical device - Google Patents

Mems switching circuit and method for an implantable medical device

Info

Publication number
WO2002068046B1
WO2002068046B1 PCT/US2001/047000 US0147000W WO02068046B1 WO 2002068046 B1 WO2002068046 B1 WO 2002068046B1 US 0147000 W US0147000 W US 0147000W WO 02068046 B1 WO02068046 B1 WO 02068046B1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
electrical
imd
micro
mems
Prior art date
Application number
PCT/US2001/047000
Other languages
French (fr)
Other versions
WO2002068046A1 (en
Inventor
David L Thompson
Daniel L Greeninger
Michael F Mattes
Original Assignee
Medtronic Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Medtronic Inc filed Critical Medtronic Inc
Priority to DE60125817T priority Critical patent/DE60125817T2/en
Priority to EP01989982A priority patent/EP1339452B1/en
Publication of WO2002068046A1 publication Critical patent/WO2002068046A1/en
Publication of WO2002068046B1 publication Critical patent/WO2002068046B1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/362—Heart stimulators
    • A61N1/37—Monitoring; Protecting
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/362—Heart stimulators
    • A61N1/365—Heart stimulators controlled by a physiological parameter, e.g. heart potential
    • A61N1/368—Heart stimulators controlled by a physiological parameter, e.g. heart potential comprising more than one electrode co-operating with different heart regions
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
    • A61N1/362—Heart stimulators
    • A61N1/37—Monitoring; Protecting
    • A61N1/3718—Monitoring of or protection against external electromagnetic fields or currents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/38—Applying electric currents by contact electrodes alternating or intermittent currents for producing shock effects
    • A61N1/39—Heart defibrillators
    • A61N1/3906—Heart defibrillators characterised by the form of the shockwave
    • A61N1/3912—Output circuitry therefor, e.g. switches
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • A61N1/18—Applying electric currents by contact electrodes
    • A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
    • A61N1/38—Applying electric currents by contact electrodes alternating or intermittent currents for producing shock effects
    • A61N1/39—Heart defibrillators
    • A61N1/3956—Implantable devices for applying electric shocks to the heart, e.g. for cardioversion

Abstract

An improved switching system for use with an implantable medical device (IMD) is described. The system utilizes Micro-Electrical-Mechanical system (MEMS) switches in place of one or more switches formerly implemented using transistor networks. Any type of switching circuit used within an IMD may be implemented using this technology. For example, MEMS switches may be utilized in a circuit for selectably delivering electrical stimulation to a patient, and/or in a circuit for providing surge protection. The fabrication of the MEMS switches may be performed using one or more separate tubs or wells on a silicon substrate to isolate switching circuitry from other IMD circuitry.

Claims

AMENDED CLAIMS[Received by the International Bureau on 11 October 2002 (11.10.02): original claims 1-43 replaced by amended claims 1-43 (6 pages)]
1. An implantablc medical device (IMD), characterized by: a first circuit adapted to perform a first function; a second circuit adapted to perform a second function; and a switching circuit coupled to the first and second circuits to selectively electrically couple the first circuit to the second circuit, the switching circuit comprising at least one Micro-Electrical-Mechanical System (MEMs).
2. The IMD of claim 1, characterized in' that the first circuit includes a circuit to supply electrical charge, and the second circuit comprises a circuit to deliver the electrical charge to a body.
3. The IMD of claim 1, characterized rnithat the first circuit includes a source of electrical power. ,
4. The IMD of claim 3, characterized in 'that the second circuit includes a circuit to receive the electrical power.
5. The IMD of claim 1, characterized in that the switching circuit includes a circuit to selectively electrically isolate the first circuit from the second circuit to prevent the second circuit from voltage surges experienced by the first circuit.
6. The IMD of claim 1, characterized m that the second circuit is adapted to provide at least one return current path for the first circuit.
7. The IMD of claim 1, characterized in that the Micro-Electrical-Mechanical System includes an activation mechanism that is electromagneticaJly activated.
8. The IMD of claim 1, characterized in that the Micro-Electrical-Mechanical System includes an activation mechanism that is thermally activated. 14
9. The D of claim 1, characterized in that at least one of the first and second circuits is adapted to provide high- voltage electrical stimulation to a body.
10 The IMD of claim 1 , characterized in that the Micro-Electrical-Mechanical
System includes an activation mechanism that is electro-statically activated.
11. The IMD of claim 1 , characterized in that the first circuit includes multiple medical electrical leads, the second circuit includes a circuit to generate an electrical signal, and the switching circuit includes a circuit to route the electrical signal to the multiple medical electrical leads.
12. The IMD of claim 1 , characterized in that the MD is implemented using a single integrated circuit die including multiple wells, at least one of the first and second circuit is implemented in one of the multiple wells, and the switching circuit is implemented using a different one of the multiple wells.
13. The MD of claim 5, characterized m that the switching circuit is substantially suspended above the different one of the multiple wells.
14. An implantable medical device (MD), characterized by: a first circuit that is capable of providing electrical stimulation to a patient; and a switching circuit coupled to the first circuit to selectively allow the electrical stimulation to be provided to the patient, the switching circuit comprising a Micro-
Electric al-Mechanical system (MEMs)
15. The IMD of claim 14, further characterized by a control circuit coupled to the switching circuit to control the switching circuit such that the electrical stimulation is selectively provided to the patient. 15
16. The MD of claim 15, further characterized by a surge protection circuit coupled to the first circuit.
17. The MD of claim 16, characterized in that the surge protection circuit includes a Micro-Electrical-Mechanical system (MEMs)
18. The MD of claim 14, characterized in that the MD is implemented using a single integrated circuit die including multiple wells, the first circuit is implemented in one of the multiple wells, and the switching circuit is implemented using a different one of the multiple wells.
19. The IMD of claim 18, characterized in that the switching circuit is substantially suspended above the different one of the multiple wells.
20. The MD of claim 14, characterized in that the control circuit provides at least one electrical signal to control the switchin •ge c ' ircuit.
21. The MD of claim 14, characterized in that the Micro-Electrical-Mechanical system includes an activation mechanism that is electromagnetically activated.
22. The MD of claim 14, characterized in that the Micro-Electrical-Mechanical system includes an activation mechanism that is thermally activated.
23. The MD of claim 14, characterized in that the Micro-Electrical-Mechamcal system includes an activation mechanism that is electrostatically activated.
24. The MD of claim 14, characterized in that the switching circuit includes a MEMs switch to select a return current path. 16
25. The MD of claim 14, characterized in that the first circuit is capable of delivering high-voltage electrical stimulation
26. The IMD of claim 14, characterized in that the stimulation circuit includes a circuit to deliver high-voltage electrical stimulation.
27. The IMD of claim 14, characterized in thai the Micro-Electrical-Mechanical system is a latching switch.
28. The MD of claim 14, characterized in that the Micro-Electrical-Mechanical system is a momentary-contact switch.
29. A method of controlling delivery of electrical stimulation to a body, characterized by: ) generating a stimulation signal; and b.) utilizing a Micro-Electncal-Mechanical system (MEMs) switch to control delivery of the stimulation signal to the body.
30. The method of claim 29, characterized in that step b.) includes generating an electrical control signal to close the MEMs switch.
31. The method of claim 29, characterized in that step b.) includes generating an electro-magnetic control signal to close the MEMs switch.
32. The method of claim 29, characterized in that step b.) includes generating a thermal control signal to close the MEMs switch.
33. The method of claim 29, characterized in that the stimulation signal is a high- voliage stimulation signal.
34. The method of claim 29, characterized in that the stimulation signal is a pacing signal. 17
35. The method of claim 29, further characterized by utilizing a MEMs switch to select a return current path.
36. The method of claim 29, further characterized by: detecting an electrical disturbance; and utilizing a MEMs switch to manage the electrical disturbance.
37. A method of operating an iraplantable medical device, characterized by- (a) providing a first circuit adapted to perform a first function; (b) providing a second circuit adapted to perform a second function; and
(c) utilizing at least one Micro-Electrical-Mechanical System (MEMs) to selectively electrically couple the first and second circuits.
38. The method of claim 37, further characterized utilizing the first circuit to deliver power to the second circuit after the first and second circuits are selectively electπcally coupled.
39. The method of claim 37, further characterized by utilizing at portion of the second circuit as a return current path for the first circuit after the first and second circuits are selectively electrically coupled.
40. The method of claim 37, characterized in that step (c) includes electrically isolating the first circuit from the second circuit when a electrical disturbance is sensed in at least one of the first and the second circuits.
41. The method of claim 37, characterized in that step (c) includes utilizing an electromagnetic signal to cause the MEMs to electπcally couple the first and second circuits.
42. The method of claim 37, characterized m that step (c) includes utilizing a thermal signal to cause the MEMs to electrically couple the first and second circuits. 18
43. The method of claim 37, further characterized by utilizing the first and second circuits to deliver electrical stimulation to a patient.
PCT/US2001/047000 2000-11-03 2001-11-02 Mems switching circuit and method for an implantable medical device WO2002068046A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE60125817T DE60125817T2 (en) 2000-11-03 2001-11-02 MEMS circuit and method for an implantable medical device
EP01989982A EP1339452B1 (en) 2000-11-03 2001-11-02 Mems switching circuit and method for an implantable medical device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US24579500P 2000-11-03 2000-11-03
US60/245,795 2000-11-03

Publications (2)

Publication Number Publication Date
WO2002068046A1 WO2002068046A1 (en) 2002-09-06
WO2002068046B1 true WO2002068046B1 (en) 2003-01-03

Family

ID=22928105

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/047000 WO2002068046A1 (en) 2000-11-03 2001-11-02 Mems switching circuit and method for an implantable medical device

Country Status (4)

Country Link
US (1) US6804552B2 (en)
EP (1) EP1339452B1 (en)
DE (1) DE60125817T2 (en)
WO (1) WO2002068046A1 (en)

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Also Published As

Publication number Publication date
EP1339452B1 (en) 2007-01-03
EP1339452A1 (en) 2003-09-03
DE60125817T2 (en) 2007-10-11
US6804552B2 (en) 2004-10-12
US20020095187A1 (en) 2002-07-18
DE60125817D1 (en) 2007-02-15
WO2002068046A1 (en) 2002-09-06

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