Medical for tracking patient functional status

• US 6,280,409 B1
• Filed: 09/28/1999
• Issued: 08/28/2001
• Est. Priority Date: 05/13/1998
• Status: Expired due to Term

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Padmanabhan, Vasant, Stone, Karen A.
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US09/408,469
• Time in Patent Office: 700 Days
• Field of Search: 604/66, 604/67
• US Class Current: 604/67
• CPC Class Codes: A61B 5/0031 Implanted circuitry
• CPC Class Codes: A61B 5/1118 Determining activity level
• CPC Class Codes: A61B 5/7232 involving compression of the physiological signal, e.g. to extend the signal recording period
• CPC Class Codes: G16H 40/63 for local operation
• CPC Class Codes: G16H 40/67 for remote operation
• CPC Class Codes: G16H 50/30 for calculating health indices; for individual health risk assessment

Abstract

An implantable medical device determines activity levels over a set of time periods, preferably on the order of seconds, minutes and hours and a display is enabled for days or weeks at recorded activity levels over a range of dates. This enables physical review of patient functional status. Additional physiologic data can be recorded along with the activity data, and this too may be reported out from the implanted device to a medical communications system for alarm purposes, filtrating drugs or other monitoring tasks.

Claims

1. A method of tracking patient functional status including the methods of:

a.) measuring activity counts with an implantable activity sensor;

b.) determining a number of activity counts sensed during a first time period of a first predetermined length, and if the number of sensed activity counts is greater than a predetermined value, recording the time period as an activity period;

c.) repeating for a predetermined number of subsequent time periods of the first predetermined length; and

d.) titrating patient medication levels based on a patient'"'"'s activity level as indicated by the number of time periods of the first predetermined length that are designated as activity periods.

2. The method of claim 1, including the method of displaying the activity periods on a user display.

3. The method of claim 2, and further including the method of further displaying a value indicative of an average activity level occurring during the first time period and all of the predetermined number of subsequent time periods.

4. The method of claim 1, including the method of determining the total amount of time represented by the time periods of the first predetermined length that are designated as activity periods.

5. The method of claim 1, and including the method of activating a patient alarm based on the number of time periods of the first predetermined length that are designated as activity periods.

6. The method of claim 1, and further including the step of repeating steps a.) through c.) a predetermined number of times prior to performing step d.).

7. The method of claim 6, and further including the step of determining if the number of time periods of the first predetermined length that are designated as activity periods during a second predetermined period of time is indicative of a pre-defined trend, and if so, performing step d.) based on the pre-defined trend.

8. The method of claim 1, and further including the method of transferring displayed data to a remote user display for viewing.