US 5,904,708 A · System and method for deriving relative physiologic signals

Abstract

A patient monitoring and/or therapy delivery system and method employing an implantable medical device for sensing absolute physiologic signal values within the body of a patient, e.g., absolute blood pressure, temperature, etc., and an external monitoring device for monitoring and conveying ambient signal values to the implantable medical device, wherein the absolute physiologic signal values and the ambient signal values are combined to derive relative physiologic signal values for storage and/or control of a therapy provided by the implantable medical device. In the context of an implantable physiologic monitor, the relative and optionally, the absolute and/or ambient physiologic signal values are stored in memory for telemetry out to an external programmer in an uplink RF telemetry transmission initiated by medical personnel operating the external programmer. In the context of an implantable therapy delivery device, the relative physiologic signal values are also employed in therapy delivery algorithms.

Claims44

Dependent claims

An implantable medical device method for deriving relative physiologic signal value data for use by and/or storage within an implantable medical device implanted within a patient's body comprising the steps of:

providing an external monitoring device associated with the patient, and in the external monitoring device,
sensing an ambient state or condition outside the body affecting a sensed physiologic state or condition within the body;
deriving an ambient signal value from the sensed ambient state or condition;
and
conveying the ambient signal value from the external monitoring device to the implantable medical device;
and
in the implantable medical device implanted in the patient's body,
sensing a physiologic state or condition within the body of the patient;
deriving an absolute physiologic signal value from the sensed physiologic state or condition;
receiving the ambient signal value conveyed from the external monitoring device;
and
combining the derived absolute physiologic signal value and the conveyed ambient signal value to derive a relative physiologic signal value therefrom.

9 more elements

A system for deriving relative physiologic signal values from absolute physiologic signal values for use by and/or storage within an implantable medical device comprising:

an external monitoring device associated with the patient comprising,
external sensing means for sensing an ambient state or condition outside the body affecting a sensed physiologic state or condition within the body;
signal processing means coupled with said external sensing means for deriving an ambient signal value from the sensed ambient state or condition;
and
signal conveying means for conveying the ambient signal value from the external monitoring device to the implantable medical device;
and
the implantable medical device implanted within a patient's body comprising,
implantable sensing means for sensing a physiologic state or condition within the body of the patient;
signal processing means coupled with said implantable sensing means for deriving an absolute physiologic signal value from the sensed physiologic state or condition;
receiving means for receiving ambient signal values conveyed from said signal conveying means;
and
means for combining each derived absolute physiologic signal value and the sensed ambient signal value to derive a relative physiologic signal value therefrom.

9 more elements

providing an external monitoring device associated with the patient, and in the external monitoring device,
periodically sensing an ambient state or condition outside the body affecting a sensed physiologic state or condition within the body and deriving an ambient signal value from each sensed ambient state or condition;
storing a plurality of the ambient signal values;
and
conveying the plurality of ambient signal values from the external monitoring device to the implantable medical device;
and
in the implantable medical device implanted in the patient's body,
periodically sensing a physiologic state or condition within the body of the patient and deriving an absolute physiologic signal value from each sensed physiologic state or condition;
storing a plurality of the absolute physiologic signal values;
receiving the plurality of ambient signal values conveyed from the external monitoring device;
and
combining the plurality of derived absolute physiologic signal values and the plurality of conveyed ambient signal values to derive a plurality of relative physiologic signal values therefrom.

9 more elements

A system for deriving relative physiologic signal values from absolute physiologic signal values for use by and/or storage within an implantable medical device comprising:

an external monitoring device associated with the patient comprising,
external sensing means for periodically sensing an ambient state or condition outside the body affecting a sensed physiologic state or condition within the body;
signal processing means coupled with said external sensing means for deriving an ambient signal value from the sensed ambient state or condition;
memory means for storing a plurality of the ambient signal values;
and
signal conveying means for conveying the plurality of ambient signal values from the external monitoring device to the implantable medical device;
and
the implantable medical device implanted within a patient's body comprising,
implantable sensing means for periodically sensing a physiologic state or condition within the body of the patient;
signal processing means coupled with said implantable sensing means for deriving an absolute physiologic signal value from the sensed physiologic state or condition;
receiving means for receiving the plurality of ambient signal values conveyed from said signal conveying means;
and
means for combining the plurality of derived absolute physiologic signal values with the plurality of sensed ambient signal values to derive a plurality of relative physiologic signal values therefrom.

10 more elements

Dependencies are inferred from the claim text.

System and method for deriving relative physiologic signals

Life of this patent

System and method for deriving relative physiologic signals

Life of this patent

Abstract

Claims44