Priming sensor for a medical fluid delivery system

Patent metadata

Field	Value
Publication number	US-2024399040-A1
Application number	US-202418800704-A
Country	US
Kind code	A1
Filing date	Aug 12, 2024
Priority date	Apr 8, 2019
Publication date	Dec 5, 2024
Grant date	—

Abstract

A priming sensor for a medical fluid delivery device is disclosed. In an example, the priming sensor includes light emitters and a detector. The detector is configured to detect light emitted by the emitters that interacts with a patient tube connected to the priming sensor. A processor of a medical fluid delivery device causes the emitters to operate in a sweep pattern during a sweep period. The processor receives output data from the detector that is indicative of light detected during the sweep period. The processor creates an output waveform corresponding to the sweep period based on the output data and compares the output waveform to at least one reference waveform to determine one of (a) a no-tube state, (b) a dry tube state, or (c) a wet tube state. The processor provides an output indicative of the comparison for operation of the medical fluid delivery device.

First claim

The invention is claimed as follows:

1 . A peritoneal dialysis apparatus comprising:
at least one pump configured to move fluid through a patient tube; a priming sensor including a holder section configured to retain an end of the patient tube, the priming sensor further including a first emitter, a second emitter, a third emitter, and a detector, the detector configured to detect light emitted by the first emitter, the second emitter, and the third emitter that interacts with the patient tube; a display screen; a processor configured to operate the priming sensor, the at least one pump, and the display screen; and a memory storing instructions, which when executed by the processor, cause the processor to:
(i) cause the first emitter, the second emitter, and the third emitter to operate in a sweep pattern during a sweep period, where a peak brightness of the first emitter occurs before a peak brightness of a second emitter, and the peak brightness of the second emitter occurs before a peak brightness of the third emitter,
(ii) receive output data from the detector that is indicative of light detected during the sweep period, and
(iii) use the output data to determine one of (a) a no-tube state, (b) a dry tube state, or (c) a wet tube state, and
(iv) provide an output indicative of the determination from (iii),
wherein the memory stores additional instructions, which when executed by the processor, cause the processor to:
receive an indication that a patient is starting a dialysis therapy,
instruct, via the display screen, the patient to insert the end of the patient tube into the holder section of the priming sensor,
perform (i) to (iv) at least once,
when the output is indicative of (b) the dry tube state, begin a priming sequence by causing the at least one pump to pump fluid through the patient tube from a fluid source and performing (i) to (iv) at least once, and
during the priming sequence when the output is indicative of (c) the wet tube state, end the priming sequence by causing the at least one pump to stop and instruct, via the display screen, the patient to remove the patient tube from the holder section and connect the end of the patient tube to a patient line set or a catheter.

2 . The peritoneal dialysis apparatus of claim 1 , wherein the memory stores further instructions, which when executed by the processor, cause the processor to:
receive an indication the patient line is connected to the patient line set or the catheter; and start a dialysis treatment by causing the at least one pump to pump fluid through the patient tube.

3 . The peritoneal dialysis apparatus of claim 1 , wherein the memory stores further instructions, which when executed by the processor, cause the processor to instruct when the output is indicative of (b) the dry tube state before the priming sequence, via the display screen, the patient to connect at least one fluid source to a respective source tube of the peritoneal dialysis apparatus.

4 . The peritoneal dialysis apparatus of claim 1 , wherein the memory stores further instructions, which when executed by the processor, cause the processor to:
during the priming sequence when the output is indicative of (c) the wet tube state, repeatedly increment a threshold counter and perform (i) to (iv) at least once until either (a) the no-tube state is detected or the counter exceeds a limit; and when the counter exceeds the limit, at least one of:
display, via the display screen, at least one message indicative that the patient tube has not yet been connected to the patient line set or the catheter; or
cause an alarm to be activated.

5 . The peritoneal dialysis apparatus of claim 1 , wherein the memory stores further instructions, which when executed by the processor, cause the processor to:
during the priming sequence when the output is indicative of (b) the dry tube state, repeatedly increment a threshold counter and perform (i) to (iv) at least once until either (c) the wet tube state is detected or the counter exceeds a limit; and when the counter exceeds the limit, at least one of:
display, via the display screen, at least one message indicative of a priming error; or
cause an alarm to be activated indicative of a priming error.

6 . The peritoneal dialysis apparatus of claim 5 , wherein the memory stores further instructions, which when executed by the processor, cause the processor to:
receive an indication the priming error has been corrected; and restart the priming sequence.

7 . The peritoneal dialysis apparatus of claim 1 , wherein the memory stores further instructions, which when executed by the processor, cause the processor to:
before the priming sequence when the output is indicative of (a) the no-tube state, repeatedly increment a threshold counter and perform (i) to (iv) at least once until either (b) the dry tube state is detected or the counter exceeds a limit; and when the counter exceeds the limit, at least one of:
display, via the display screen, at least one message indicative the patient tube should be inserted into the holder section; or
cause an alarm to be activated.

8 . The peritoneal dialysis apparatus of claim 1 , wherein the memory stores further instructions, which when executed by the processor, cause the processor to:
increment a counter each time (c) the wet tube state is determined; compare a value of the counter to a counter threshold; and determine (c) the wet tube state when the value of the counter equals or exceeds the counter threshold.

9 . The peritoneal dialysis apparatus of claim 1 , wherein the processor causes the emitters to operate in the sweep pattern by:
at a first time, causing the first emitter to emit light during a first time period according to an activation pattern that is defined by instructions in the memory; at a second time after the first time, causing the second emitter to emit light during a second time period according to the activation pattern; and at a third time after the second time, causing the third emitter to emit light during a third time period according to the activation pattern.

10 . The peritoneal dialysis apparatus of claim 9 , wherein the second time begins during the first time period or after the first time period, and the third time begins during the second time period or after the second time period.

11 . The peritoneal dialysis apparatus of claim 9 , wherein the second time begins between halfway through and ¾ of the way through the first time period, and the third time begins between halfway through and ¾ of the way through the second time period.

12 . The peritoneal dialysis apparatus of claim 9 , wherein the activation pattern specifies a control of a brightness of the light emitted by the first, second, and third emitters by increasing a duty cycle from a start of a respective time period until half of the respective time period where the peak brightness is reached, and decreasing the duty cycle from half of the respective time period until the end of the respective time period.

13 . The peritoneal dialysis apparatus of claim 9 , wherein the activation pattern corresponds to a Gaussian impulse waveform.

14 . The peritoneal dialysis apparatus of claim 1 , wherein the first emitter is located on a first side of the patient tube opposite from the detector which is located on a second side of the patient tube when the patient tube is inserted into the priming sensor.

15 . The peritoneal dialysis apparatus of claim 14 , wherein the second emitter is located on the first side of the patient tube adjacent to the first emi

Assignees

• Baxter Int
• Vantive Health Gmbh

Inventors

• Zafiris John

Classifications

• A61M2205/331

  used as turbidity change detectors, e.g. for priming-blood or plasma-hemoglubine-interface detection · CPC title

• A61M2205/3306

  Optical measuring means · CPC title

• A61M1/3643 Primary

  Priming, rinsing before or after use · CPC title

• A61M1/288 Primary

  Priming (priming in extracorporeal blood circuits A61M1/3643) · CPC title

• A61M1/28 Primary

  Peritoneal dialysis {; Other peritoneal treatment, e.g. oxygenation} · CPC title