Adaptive signal processing for infusion devices and related methods and systems
First Claim
Patent Images
1. A method comprising:
- storing, by a control module coupled to a sensing element, a plurality of unfiltered measurement values obtained from a sensing element in a first buffer, the plurality of unfiltered measurement values comprising periodically sampled output electrical signals from the sensing element, wherein the output electrical signals are influenced by a physiological condition in a body of a user;
determining, by the control module, a plurality of filtered measurements indicative of the physiological condition of the user based on the plurality of unfiltered measurement values;
storing, by the control module, the plurality of filtered measurements in a second buffer;
determining, by the control module, a first derivative metric associated with a current filtered measurement of the plurality of filtered measurements and a second derivative metric associated with the current filtered measurement based on the plurality of filtered measurements;
determining, by the control module, a process variance metric indicative of a signal characteristic of a current filtered measurement based at least in part on the first derivative metric and the second derivative metric;
determining, by the control module, an output filtered measurement indicative of the physiological condition of the user based at least in part on the current filtered measurement, the process variance metric, and a previous output measurement; and
transmitting, by a communications interface coupled to the control module, the output filtered measurement to an infusion device, wherein operation of the infusion device to deliver fluid to the body of the user is influenced by the output filtered measurement, the fluid influencing the physiological condition in the body of the user.
1 Assignment
0 Petitions
Accused Products
Abstract
Infusion systems, infusion devices, and related operating methods are provided. An exemplary method of operating an infusion device involves obtaining a filtered measurement indicative of a physiological condition of a user, determining a metric indicative of a characteristic of the filtered measurement based at least in part on one or more derivative metrics associated with the filtered measurement, and determining an output measurement indicative of the physiological condition of the user based at least in part on the filtered measurement, the metric, and a previous output measurement.
-
Citations
19 Claims
-
1. A method comprising:
-
storing, by a control module coupled to a sensing element, a plurality of unfiltered measurement values obtained from a sensing element in a first buffer, the plurality of unfiltered measurement values comprising periodically sampled output electrical signals from the sensing element, wherein the output electrical signals are influenced by a physiological condition in a body of a user; determining, by the control module, a plurality of filtered measurements indicative of the physiological condition of the user based on the plurality of unfiltered measurement values; storing, by the control module, the plurality of filtered measurements in a second buffer; determining, by the control module, a first derivative metric associated with a current filtered measurement of the plurality of filtered measurements and a second derivative metric associated with the current filtered measurement based on the plurality of filtered measurements; determining, by the control module, a process variance metric indicative of a signal characteristic of a current filtered measurement based at least in part on the first derivative metric and the second derivative metric; determining, by the control module, an output filtered measurement indicative of the physiological condition of the user based at least in part on the current filtered measurement, the process variance metric, and a previous output measurement; and transmitting, by a communications interface coupled to the control module, the output filtered measurement to an infusion device, wherein operation of the infusion device to deliver fluid to the body of the user is influenced by the output filtered measurement, the fluid influencing the physiological condition in the body of the user. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. A sensing device comprising:
-
a sensing element to output electrical signals influenced by a physiological condition of a user; a first buffer to maintain a plurality of unfiltered measurement values comprising periodically sampled output electrical signals from the sensing element; a second buffer to maintain a plurality of filtered measurements; a control module coupled to the sensing element, the first buffer, and the second buffer to; determine the plurality of filtered measurements indicative of the physiological condition of the user based on the plurality of unfiltered measurement values; determine a first derivative metric associated with a current filtered measurement of the plurality of filtered measurements and a second derivative metric associated with the current filtered measurement based on the plurality of filtered measurements; determine a process variance metric indicative of a signal characteristic of the current filtered measurement of the plurality of filtered measurements based at least in part on the first derivative metric and the second derivative metric associated with the current filtered measurement; and determine an output filtered measurement indicative of the physiological condition of the user based at least in part on the current filtered measurement, the process variance metric, and a previous output measurement; and a communications interface coupled to the control module to transmit the output filtered measurement. - View Dependent Claims (18, 19)
-
Specification