System for the selective activation of functions in an implantable device by a magnetic field
First Claim
Patent Images
1. An implantable cardiac stimulation device that provides electrical stimulation to a patient'"'"'s heart, the device comprising:
- a power supply;
a pulse generating circuit that produces the electrical stimulation;
a magnetic enablement circuit that provides a signal when detecting an external magnetic field, wherein at least one parameter of the signal varies with a magnitude of the detected external magnetic field;
a sensor device that senses heart function and provides a heart signal indicative thereof;
a controller that receives the heart signal from the sensor device and induces the pulse generating circuit to provide the electrical stimulation when the controller determines that the heart is in need of the electrical stimulation, and wherein the controller receives the signal from the magnetic enablement circuit and, if the at least one parameter of the signal corresponds to a first value, the controller initiates a first preselected function, and if the at least one parameter of the signal corresponds to a second value, the controller initiates a second preselected function.
1 Assignment
0 Petitions
Accused Products
Abstract
An implantable medical device that includes a magnetic sensor circuit that senses the presence of an external magnetic field and provides a signal that is proportionate to the strength of the magnetic field. The implantable medical device uses the variable signal to determine whether a magnetic field is being applied that is selected to activate a preselected function. In one implementation, the preselected function is a power up sequence.
109 Citations
29 Claims
-
1. An implantable cardiac stimulation device that provides electrical stimulation to a patient'"'"'s heart, the device comprising:
-
a power supply; a pulse generating circuit that produces the electrical stimulation; a magnetic enablement circuit that provides a signal when detecting an external magnetic field, wherein at least one parameter of the signal varies with a magnitude of the detected external magnetic field; a sensor device that senses heart function and provides a heart signal indicative thereof; a controller that receives the heart signal from the sensor device and induces the pulse generating circuit to provide the electrical stimulation when the controller determines that the heart is in need of the electrical stimulation, and wherein the controller receives the signal from the magnetic enablement circuit and, if the at least one parameter of the signal corresponds to a first value, the controller initiates a first preselected function, and if the at least one parameter of the signal corresponds to a second value, the controller initiates a second preselected function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 29)
-
-
8. An implantable medical device that provides stimulation therapy to a patient, the device comprising:
-
a therapy delivery system; a magnetic enablement circuit that includes a magnetic field sensor that provides an activation signal when exposed to a magnetic field of a selected threshold; a controller that receives signals from the magnetic enablement circuit and provides signals to the therapy delivery system so as to induce the therapy delivery system to provide stimulation therapy to the patient and wherein the controller activates the implantable medical device upon receipt of the activation signal from the magnetic enablement circuit; a power supply that provides power to the therapy delivery system and the controller, wherein the controller and the therapy delivery system consume power at a normal operating rate upon activation and wherein the controller and the therapy delivery system consume power at a reduced rate, which is less than the normal operating rate prior to activation of the device to thereby conserve power prior to activation of the implantable medical device. - View Dependent Claims (9, 10, 11, 12, 13)
-
-
14. An implantable medical device that provides stimulation therapy to a patient, the device comprising:
-
a therapy delivery system that is adapted to deliver therapy to the patient when implanted in the patient; a magnetic field sensor that detects the presence of an external magnetic field and produces a magnetic signal that has a magnitude that varies with the magnitude of the detected external magnetic field; a controller that receives a signal corresponding to the magnetic signal wherein the controller uses the signal to initiate a first preselected function in response to detection of a first magnetic field having a first magnitude and a second preselected in response to detection of a second magnetic field having a second magnitude during operation of the implantable medical device. - View Dependent Claims (15, 16, 17, 18, 19, 20)
-
-
21. An implantable medical device that provides stimulation therapy to a patient, the device comprising:
-
means for delivering therapy to the patient when implanted in the patient; means for detecting the presence of an external magnetic field; means for producing a magnetic field signal that has at least one parameter that varies with the magnitude of the detected external magnetic field; means for initiating a first preselected function in response to a first magnetic field signal having a first parameter value and a second preselected function in response to a second magnetic field signal having a second parameter value. - View Dependent Claims (22, 23, 24, 25, 26, 27)
-
-
28. In an implantable cardiac stimulation device, a method comprising:
-
detecting an external magnetic field; determining a magnitude of the external magnetic field; and initiating a first preselected function in response to detection of an external magnetic field having a first magnitude and a second preselected function in response to detection of an external magnetic field having a second magnitude.
-
Specification