Methods and systems for controlling a state of a neurostimulator
First Claim
1. A method for selecting a state of operation of an active implantable medical device, the method comprising:
- outputting a signal from a magnet sensor of the implantable medical device when a magnetic field is detected relative to the implantable medical device by the magnet sensor, the implantable medical device operating in a current state at the time of a first detection of the magnetic field;
initiating a timer of the implantable medical device that tracks an elapsed-magnet-detection time period over which the signal is continuously output;
comparing by a processor of the implantable medical device, the elapsed-magnet-detection time period to a first interval characterized by a first interval end point and a second interval characterized by a second interval end point that is different from the first interval end point;
if the elapsed-magnet-detection time period exceeds the second interval end point, outputting a signal from the processor that forces the state of operation of the active implantable medical device to a first state regardless of the current state, wherein the first state corresponds to a therapy disabled state;
if the elapsed-magnet-detection time period terminates between the first interval end point and the second interval end point, outputting a signal from the processor that toggles the state of the active implantable medical device from the current state to either the first state or to a different state;
if the elapsed-magnet-detection time period terminates before the first interval end point, maintaining the state of the active implantable medical device in the current state;
monitoring a number of times the state of operation of the implantable medical device has changed from a therapy enabled state to the therapy disabled state within a period of time due to terminations of the elapsed-magnetic-detection time period; and
preventing the state of the active implantable medical device from being changed from the therapy disabled state to the therapy enabled state when the elapsed-magnetic-detection time period terminates between the first interval end point and the second interval end point, and the number of times exceeds a threshold value.
4 Assignments
0 Petitions
Accused Products
Abstract
A method and system is described for ensuring a state of an active implantable medical device based on the presence and persistence of a magnetic field. The output of a magnetic field sensor is monitored. The active implantable medical device is maintained in a first state, for so long as the presence of a magnetic field is detected by the magnetic field sensor, until a first interval is surpassed. If the first interval is surpassed, then a determination is made as to whether a second interval has been surpassed. If it is determined that the second interval has not been surpassed, then the active implantable medical device is transitioned into a second state. If it is determined that the second interval has been surpassed, then it is ensured that the active implantable medical device is in a predetermined one of the first and second states.
18 Citations
13 Claims
-
1. A method for selecting a state of operation of an active implantable medical device, the method comprising:
-
outputting a signal from a magnet sensor of the implantable medical device when a magnetic field is detected relative to the implantable medical device by the magnet sensor, the implantable medical device operating in a current state at the time of a first detection of the magnetic field; initiating a timer of the implantable medical device that tracks an elapsed-magnet-detection time period over which the signal is continuously output; comparing by a processor of the implantable medical device, the elapsed-magnet-detection time period to a first interval characterized by a first interval end point and a second interval characterized by a second interval end point that is different from the first interval end point; if the elapsed-magnet-detection time period exceeds the second interval end point, outputting a signal from the processor that forces the state of operation of the active implantable medical device to a first state regardless of the current state, wherein the first state corresponds to a therapy disabled state; if the elapsed-magnet-detection time period terminates between the first interval end point and the second interval end point, outputting a signal from the processor that toggles the state of the active implantable medical device from the current state to either the first state or to a different state; if the elapsed-magnet-detection time period terminates before the first interval end point, maintaining the state of the active implantable medical device in the current state; monitoring a number of times the state of operation of the implantable medical device has changed from a therapy enabled state to the therapy disabled state within a period of time due to terminations of the elapsed-magnetic-detection time period; and preventing the state of the active implantable medical device from being changed from the therapy disabled state to the therapy enabled state when the elapsed-magnetic-detection time period terminates between the first interval end point and the second interval end point, and the number of times exceeds a threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 11, 12)
-
-
9. A method for controlling a state of operation of an active implantable medical device comprising:
-
outputting a signal when a magnetic field is detected relative to the implantable medical device, wherein the implantable medical device is operating in a current state being one of a therapy enabled state or a therapy disabled state; initiating a timer that tracks an elapsed-magnet-detection time period over which the signal is continuously output; if the elapsed-magnet-detection time period terminates during a first time interval beginning at first detection of the magnetic field, maintaining the implantable medical device in the current state; if the elapsed-magnet-detection time period terminates during a second time interval beginning at the end of the first time interval, setting the implantable medical device to a different state than the current state, the different state being;
1) the therapy disabled state when the current state is the therapy enabled state, and
2) the therapy enabled state when the current state is the therapy disabled state;if the elapsed-magnet-detection time period does not terminate during the second time interval, upon termination of the second time interval, setting the implantable medical device to a predetermined one of the current state and the different state; monitoring a number of times the state of operation of the implantable medical device has changed from a therapy enabled state to the therapy disabled state within a period of time due to terminations of the elapsed-magnetic-detection time period; and preventing the state of the active implantable medical device from being changed from the therapy disabled state to the therapy enabled state when the elapsed-magnetic-detection time period terminates between the first interval end point and the second interval end point, and the number of times exceeds a threshold value. - View Dependent Claims (10)
-
-
13. A method for selecting a state of operation of an active implantable medical device, the method comprising:
-
outputting a signal from a magnet sensor of the implantable medical device when a magnetic field is detected relative to the implantable medical device by the magnet sensor, the implantable medical device operating in a current state at the time of a first detection of the magnetic field; initiating a timer of the implantable medical device that tracks an elapsed-magnet-detection time period over which the signal is continuously output; comparing by a processor of the implantable medical device, the elapsed-magnet-detection time period to a first interval characterized by a first interval end point and a second interval characterized by a second interval end point that is different from the first interval end point; if the elapsed-magnet-detection time period exceeds the second interval end point, outputting a signal from the processor that forces the state of operation of the active implantable medical device to a first state regardless of the current state, wherein the first state corresponds to a therapy disabled state; if the elapsed-magnet-detection time period terminates between the first interval end point and the second interval end point, outputting a signal from the processor that toggles the state of the active implantable medical device from the current state to either the first state or to a different state; if the elapsed-magnet-detection time period terminates before the first interval end point, maintaining the state of the active implantable medical device in the current state; monitoring a number of times the state of operation of the implantable medical device has changed from a therapy enabled state to the therapy disabled state within a period of time due to terminations of the elapsed-magnetic-detection time period; and changing from the therapy disabled state to a nominal therapy enabled state when the elapsed-magnetic-detection time period terminates between the first interval end point and the second interval end point, and the number of times exceeds a threshold value, wherein the nominal therapy enabled state corresponds to a therapy having a strength less than the therapy enabled state.
-
Specification