Adaptive algorithm for access disconnect detection
First Claim
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1. A method for detecting an access disconnection, the method comprising:
- inputting or accessing information about a patient for an extracorporeal blood therapy;
inputting or accessing at least one value for an alert criterion for an access disconnection;
beginning the extracorporeal blood therapy;
reading a first of a plurality of properties concerning the therapy and blood of the patient, the plurality of properties selected from the group consisting of a distance between access needles for the extracorporeal therapy, a temperature of a portion of an extracorporeal blood therapy machine, a speed of a pump of the extracorporeal blood therapy machine, an administration of a bolus to the extracorporeal blood circuit, and a dialysate temperature;
proceeding with the extracorporeal blood therapy;
reading a second of the plurality of properties concerning the therapy and the blood of the patient;
calculating a change in the at least one value for the alert criterion based on the reading of the second of the plurality of properties; and
adjusting the at least one value for an alert for the access disconnect criterion.
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Abstract
An extracorporeal therapy machine removes blood from a patient in order to treat the blood and then return the blood to the patient. If the removal needle or the return needle is dislodged and blood is not returned, the patient may suffer a great blood loss. A new technique for detecting dislodgement uses the normal, initial values of a plurality of parameters of the patient and the therapy machine to set criteria or limits for an alarm, and then adjusts those criteria based on the later values of those parameters as they change during one therapy or over several therapies experienced by the patient.
66 Citations
23 Claims
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1. A method for detecting an access disconnection, the method comprising:
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inputting or accessing information about a patient for an extracorporeal blood therapy; inputting or accessing at least one value for an alert criterion for an access disconnection; beginning the extracorporeal blood therapy; reading a first of a plurality of properties concerning the therapy and blood of the patient, the plurality of properties selected from the group consisting of a distance between access needles for the extracorporeal therapy, a temperature of a portion of an extracorporeal blood therapy machine, a speed of a pump of the extracorporeal blood therapy machine, an administration of a bolus to the extracorporeal blood circuit, and a dialysate temperature; proceeding with the extracorporeal blood therapy; reading a second of the plurality of properties concerning the therapy and the blood of the patient; calculating a change in the at least one value for the alert criterion based on the reading of the second of the plurality of properties; and adjusting the at least one value for an alert for the access disconnect criterion. - View Dependent Claims (2, 3, 4)
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5. A method for detecting an access disconnection, the method comprising:
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inputting or accessing information about a patient for an extracorporeal blood therapy; selecting or accessing at least one electrical property value of an electrical circuit selected from the group consisting of the patient and an extracorporeal blood therapy machine as an alert criterion for an access disconnection; beginning the extracorporeal blood therapy; reading a first of a plurality of properties concerning the therapy and blood of the patient, the plurality of properties selected from the group consisting of a distance between access needles for the extracorporeal blood therapy, an elapsed time of the therapy, a temperature of at least a portion of the extracorporeal blood therapy machine, a speed of a pump of the extracorporeal blood therapy machine, administration of a bolus to the extracorporeal blood circuit; and
a dialysate temperature;proceeding with the extracorporeal blood therapy; reading a second of the plurality of properties concerning the therapy and the blood of the patient; calculating a change in the electrical property value of the alert criterion based on at least one change in the plurality of properties; and adjusting the alert criterion value. - View Dependent Claims (6, 7, 8)
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9. An access disconnect detection system, comprising:
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arterial and venous contacts configured for use with an extracorporeal blood therapy machine for administering a therapy; an electrical circuit connected to the contacts, the electrical circuit configured for sensing at least one electrical property sensed by the contacts; at least one sensor configured for sensing a plurality of properties concerning the patient or a component of the extracorporeal blood therapy machine, the plurality of properties selected from the group consisting of a pressure, a speed, an infusion rate, a presence or absence of a bolus, a presence or absence of a medication, a duration of time, and a temperature; a computer having a memory, the computer configured for receiving and storing values for the plurality of the properties concerning the patient and the extracorporeal blood therapy machine; and a computer program on a computer readable medium configured for accepting first values of the plurality of properties, and for using or setting an initial criterion for determining an access disconnection, and for accepting second values of the plurality of properties and for adjusting the criterion based on the second values. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An extracorporeal therapy machine, comprising:
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a machine for administering a dialysis therapy; arterial and venous contacts configured for use with the machine; an electrical circuit connected to the contacts, the electrical circuit configured for sensing an electrical property concerning the patient or a component of the machine; at least one sensor configured for sensing at least one of a plurality of properties concerning the patient, the therapy, and the machine, the at least one sensor selected from the group consisting of a clock, a pressure sensor, a temperature sensor, and a speed sensor; a computer having a memory, the computer configured for receiving and storing values for the plurality of properties concerning the patient, the therapy, and the machine; a computer program on a computer readable medium configured for accepting first values of the plurality of properties sensed by the at least one sensor, and for setting an initial criterion for determining an access disconnection, and for accepting second values of the plurality of properties sensed by the at least one sensor and for adjusting the criterion based on the second values; and at least one input device and one output device operably connected to the computer. - View Dependent Claims (18, 19)
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20. A hemodialysis machine for administering a hemodialysis therapy, the machine comprising:
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a housing containing components of the machine; a monitor for monitoring the machine; a dialyzer; at least one blood pump for moving blood of the patient to and from the patient and through the dialyzer; arterial and venous contacts configured for use with the machine; an electrical circuit connected to the contacts, the electrical circuit configured for sensing an electrical property concerning the patient or a component of the machine; a computer having a memory, the computer configured for controlling the machine and for receiving and storing values of a plurality of properties concerning the patient, the therapy, and the machine, the plurality of properties selected from the group consisting of a distance between access needles for the hemodialysis therapy, an elapsed time of the therapy, a temperature of at least a portion of the machine, a speed of a pump of the blood pump of the machine, administration of a bolus, and a dialysate temperature; a computer program on a computer readable medium configured for accepting first values of the plurality of properties, and for setting an initial value for a criterion for determining an access disconnection, and for accepting second values of the plurality of properties and adjusting the criterion value based on the second values; and at least one input device and one output device operably connected to the computer. - View Dependent Claims (21, 22, 23)
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Specification