System and method for employing temperature measurements to control the operation of an implantable medical device
First Claim
Patent Images
1. A medical implantable device for delivering therapy to a patient, comprising:
- a therapy delivery unit delivering the therapy to the patient;
a temperature sensor circuit generating temperature measurements corresponding to the device; and
a control circuit coupled to the temperature sensor circuit to control system functions of the device other than the delivered therapy in response to the temperature measurements generated by the temperature sensor circuit.
1 Assignment
0 Petitions
Accused Products
Abstract
A medical implantable device that includes a temperature sensor circuit and a control circuit coupled to the temperature sensor circuit to control non-therapy operation of the medical implantable device in response to temperature measurements obtained by the temperature sensor circuit.
155 Citations
28 Claims
-
1. A medical implantable device for delivering therapy to a patient, comprising:
-
a therapy delivery unit delivering the therapy to the patient;
a temperature sensor circuit generating temperature measurements corresponding to the device; and
a control circuit coupled to the temperature sensor circuit to control system functions of the device other than the delivered therapy in response to the temperature measurements generated by the temperature sensor circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 28)
-
-
17. An implantable medical device (IMD), comprising:
-
a current supply;
a temperature sensor circuit sensing a temperature correspond to the implantable medical device, the temperature sensing circuit including two mismatched transistors connected to the current supply, the mismatched transistors having substantially the same collector current and having a voltage difference proportional to the temperature of the IMD;
a control circuit responsive to the voltage difference to control system functions of the medical implantable device based on the temperature. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
a resistor, wherein a difference in output voltage at the base of the mismatched transistors is applied across the resistor; and
an amplifier connected to the resistor to provide an output signal proportional to the temperature to the control circuit.
-
-
19. The IMD of claim 17, wherein the mismatched transistors are bipolar transistors having a predetermined ratio.
-
20. The IMD of claim 19, and further comprising:
-
an amplifier device coupled to the mismatched transistors; and
a gain circuit connected to a negative input of said amplifier device to automatically set a scale and resolution of said temperature sensor circuit.
-
-
21. The IMD of claim 18, wherein the amplifier includes a programmable gain programmable to indicate a first range of temperatures with coarse resolution to encompass storage conditions of the IMD, and a second range of temperatures with fine resolution to encompass operating conditions of said IMD.
-
22. The IMD of claim 21 and further including an analog to-digital converter to provide a digital temperature output of said output voltage proportional to said first and second range of temperatures.
-
23. The IMD of claim 22, further comprising a plurality of electronic components connected to the analog-to-digital converter wherein said digital temperature output is provided to the electronic components for digital processing and storage, and for monitoring a plurality of functions controlled by the electronic components.
-
24. The IMD of claim 17, further comprising:
-
a battery providing power to the implantable medical device; and
means for storing information corresponding to available power in the battery and indicating that the available power is at a predetermined value, wherein the control circuit includes circuits to prevent the storing means from indicating that the available power is at the predetermined value when the control circuit determines that the voltage difference indicates the temperature is outside of a predetermined operating temperature range.
-
-
25. The IMD of claim 17, and further including a storage device coupled to the control circuit, and wherein the control circuit includes circuits to prevent access to the storage device when the temperature is outside of a predetermined operating temperature range.
-
26. The IMD of claim 17, and further including a circuit to delivery electrical stimulation to tissue of a patient.
-
27. The IMD of claim 17, wherein the IMD includes at least one circuit that is temperature sensitive, and wherein the control circuit includes a circuit to calibrate the at least one circuit that is temperature sensitive based on the temperature of the IMD.
Specification