Low cost implantable medical device
First Claim
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1. A method of adjusting an operating parameter in an implantable cardiac pacemaker, said pacemaker having at least one transistor having a floating gate, wherein voltage on said floating gate controls said operating parameter, said method comprising the following ordered steps:
- a. activating said implantable cardiac pacemaker;
b. measuring said operating parameter;
c. determining if said operating parameter is less than a predetermined value;
d. applying a programming pulse to the floating gate of said transistor to increase said operating parameter if said operating parameter is less than said predetermined value;
e. measuring said operating parameter after said application of said programming pulse; and
f. repeating steps c through e continuously until said operating parameter is at least equal to said predetermined value.
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Abstract
A low cost, limited-function implantable medical device. The device'"'"'s synchronous circuits are driven by an ultra-slow master clock signal produced without utilization of a crystal oscillator. The device is non-invasively programmable by means of an externally applied programming magnet, which is detected by a solid state magnetic sensor (MAGFET) circuit in the implanted device. The MAGFET circuit is capable of discriminating between two polarity orientations of the programming magnet, so that one polarity is associated with increasing programmable parameters and the opposite polarity is associated with decreasing programmable parameters. Upon initial placement and detection of the programming magnet, the disclosed device performs a threshold margin test comprising three asynchronous stimulating pulses at the current pulse width and pulse amplitude settings.
93 Citations
24 Claims
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1. A method of adjusting an operating parameter in an implantable cardiac pacemaker, said pacemaker having at least one transistor having a floating gate, wherein voltage on said floating gate controls said operating parameter, said method comprising the following ordered steps:
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a. activating said implantable cardiac pacemaker; b. measuring said operating parameter; c. determining if said operating parameter is less than a predetermined value; d. applying a programming pulse to the floating gate of said transistor to increase said operating parameter if said operating parameter is less than said predetermined value; e. measuring said operating parameter after said application of said programming pulse; and f. repeating steps c through e continuously until said operating parameter is at least equal to said predetermined value. - View Dependent Claims (2, 3, 4, 6)
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5. A method of adjusting an operating parameter in an implantable cardiac pacemaker, said pacemaker containing at least one transistor having a floating gate, wherein voltage on said floating gate controls said operating parameter, said method comprising the following ordered steps:
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a. activating said implantable cardiac pacemaker; b. measuring said operating parameter; c. determining if said operating parameter is greater than a predetermined value; d. applying a programming pulse to the floating gate of said transistor to decrease said operating parameter if said operating parameter is greater than said predetermined value; e. measuring said operating parameter after said application of said programming pulse; and f. repeating steps c through e continuously until said operating parameter is no greater than said predetermined value. - View Dependent Claims (7, 8, 9)
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10. A method of adjusting an operating parameter in an implantable stimulator circuit, said implantable stimulator circuit having at least one transistor having a floating gate, wherein voltage on said floating gate controls said operating parameter, said method comprising the following ordered steps:
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a. activating said implantable stimulator circuit; b. measuring said operating parameter; c. determining if said operating parameter is less than a predetermined value; d. applying a programming pulse to the floating gate of said transistor to increase said operating parameter if said operating parameter is less than said predetermined value; e. measuring said operating parameter after said application of said programming pulse; and f. repeating steps c through e continuously until said operating parameter is at least equal to said predetermined value. - View Dependent Claims (11, 12, 13, 14, 15, 16, 18)
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17. A method of adjusting an operating parameter in an implantable stimulator circuit, said implantable stimulator circuit containing at least one transistor having a floating gate, wherein voltage on said floating gate controls said operating parameter, said method comprising the following ordered steps:
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a. activating said implantable stimulator circuit; b. measuring said operating parameter; c. determining if said operating parameter is greater than a predetermined value; d. applying a programming pulse to the floating gate of said transistor to decrease said operating parameter if said operating parameter is greater than said predetermined value; e. measuring said operating parameter after said application of said programming pulse; and f. repeating steps c through e continuously until said operating parameter is no greater than said predetermined value. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification
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Current AssigneeMedtronic Incorporated (Medtronic Plc)
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Original AssigneeMedtronic Incorporated (Medtronic Plc)
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InventorsNelson, Gary E., Thompson, David L.
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Primary Examiner(s)Kamm, William E.
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Assistant Examiner(s)Parker, Marianne
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Application NumberUS08/078,382Time in Patent Office614 DaysField of Search607/9, 607/30, 607/32, 607/60US Class Current607/9CPC Class CodesA61N 1/37211 Means for communicating wit...A61N 1/37254 Pacemaker or defibrillator ...
