Methods and systems for detecting an occlusion in a blood circuit of a dialysis system
First Claim
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1. A dialysis system comprising:
- a manifold comprising an enclosed blood flow path, wherein said blood flow path comprises a blood inlet port, a blood outlet port, and a flexible tube positioned between said blood inlet port and blood outlet port;
a pressure sensor in physical communication with manifold at a position proximate said blood outlet port;
a non-transient memory in data communication with said pressure sensor and configured to store pressure values generated and transmitted by said pressure sensor;
at least one pump in physical contact with said flexible tube and configured to pump blood from a patient'"'"'s body, through a tube, and through said blood flow path; and
a controller in data communication with said pressure sensor, said non-transient memory, and said at least one pump, wherein said controller is configured to execute a plurality of programmatic instructions in order to;
receive said pressure values;
determine an average of n pressure values, where n is a subset of said pressure values;
determine a sum of m pressure values, where m is a subset of said pressure values and where m<
n;
apply a function of said average of n pressure values and said sum of m pressure values to generate an occlusion indicator value; and
based upon said pressure difference value, determine if an alarm should be triggered.
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Abstract
The present specification describes systems and methods for detecting an occlusion in a tubing carrying a patient'"'"'s blood through a manifold and into a dialyzer in a dialysis system. A controller measures pressures value of the blood at a predetermined point after exiting the manifold and before entering the dialyzer, calculates a historical running average, calculates a weighted sum of the most recent pressure values, and determines whether to trigger an occlusion alarm based on a function of the historical running average and the weighted sum of the most recent pressure values.
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Citations
30 Claims
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1. A dialysis system comprising:
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a manifold comprising an enclosed blood flow path, wherein said blood flow path comprises a blood inlet port, a blood outlet port, and a flexible tube positioned between said blood inlet port and blood outlet port; a pressure sensor in physical communication with manifold at a position proximate said blood outlet port; a non-transient memory in data communication with said pressure sensor and configured to store pressure values generated and transmitted by said pressure sensor; at least one pump in physical contact with said flexible tube and configured to pump blood from a patient'"'"'s body, through a tube, and through said blood flow path; and a controller in data communication with said pressure sensor, said non-transient memory, and said at least one pump, wherein said controller is configured to execute a plurality of programmatic instructions in order to; receive said pressure values; determine an average of n pressure values, where n is a subset of said pressure values; determine a sum of m pressure values, where m is a subset of said pressure values and where m<
n;apply a function of said average of n pressure values and said sum of m pressure values to generate an occlusion indicator value; and based upon said pressure difference value, determine if an alarm should be triggered. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A dialysis system comprising:
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a manifold comprising an enclosed blood flow path, wherein said blood flow path comprises a blood inlet port, a blood outlet port, and a flexible tube positioned between said blood inlet port and blood outlet port; a pressure sensor in physical communication with manifold at a position proximate said blood outlet port; a non-transient memory in data communication with said pressure sensor and configured to store pressure values generated and transmitted by said pressure sensor; at least one pump in physical contact with said flexible tube and configured to pump blood from a patient'"'"'s body, through a tube, and through said blood flow path; and a controller in data communication with said pressure sensor, said non-transient memory, and said at least one pump, wherein said controller is configured to execute a plurality of programmatic instructions in order to; receive said pressure values; determine an average of n pressure values, where n is a subset of said pressure values; determine a sum of m pressure values, where m is a subset of said pressure values, m<
n, and pressure values in the m subset of pressure values include pressure values sensed later in time than pressure values in the n subset of pressure values;obtain a difference of said average of n pressure values and said sum of m pressure values to generate an occlusion indicator value; compare said occlusion indicator value to a predefined threshold number; and based upon said comparison, determine if an alarm should be triggered. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification