Medical treatment system and methods using a plurality of fluid lines
A medical treatment system, such as peritoneal dialysis system, may include control and other features to enhance patient comfort and ease of use. For example, a peritoneal dialysis system may include patient line state detector for detecting whether a patient line is primed before it is to be connected to the patient. The patient line state detector can also the ability to detect whether a patient line has been properly mounted for priming. Both patient line presence/absence and fill state can be determined using an optical system, e.g., one that employs a single optical sensor.
1. A fluid line detection system comprising:
a pump arranged to pump a liquid to a patient;
a fluid line having a proximal end fluidly connected to the pump and arranged to transfer the liquid from the pump to the patient, the fluid line having a distal end connector at a distal end of the fluid line, the distal end connector having a first portion connected to the distal end of the fluid line and a second portion for direct connection to a patient catheter, the distal end being opposite the proximal end; and
a fluid line detector comprising a receptacle including an open, U-shaped channel arranged to removably receive and hold the first portion of the distal end connector in the open, U-shaped channel and to position the distal end of the fluid line connected to the first portion of the distal end connector within the open, U-shaped channel of the fluid line detector;
wherein the fluid line detector is arranged to detect the presence and absence of the fluid line, or to detect the presence and absence of liquid in the distal end of the fluid line.
2. The fluid line detection system of claim 1 , wherein the fluid line detector comprises one or more light emitters on a first side of the channel, and a sensor on an opposing second side of the channel.
3. The fluid line detection system of claim 2 , wherein the first and second sides of the channel adjacent to the one or more light emitters and the sensor are transparent or translucent to allow transmission and reception of a light signal.
4. The fluid line detection system of claim 1 , wherein the fluid line detector includes:
a first light emitter having a first optical axis directed toward a space in which the distal end of the fluid line is to be positioned;
a second light emitter having a second optical axis directed toward the space, the second light emitter being next to the first light emitter; and
an optical sensor having a sensor optical axis and positioned on a side of the space opposite the first and second light emitters and arranged to receive light emitted by the first and second light emitters to detect the presence or absence of the fluid line, or whether the fluid line is primed with the liquid fluid.
5. The fluid line detection system of claim 4 , wherein the sensor optical axis is approximately collinear with the first optical axis.
6. The fluid line detection system of claim 5 , wherein the first optical axis passes approximately through a center of the distal end of the fluid line when it is positioned within the space.
7. The fluid line detection system of claim 4 , wherein the second optical axis is approximately parallel to the first optical axis.
8. The fluid line detection system of claim 7 , wherein the second optical axis is offset from a center of the distal end of the fluid line when it is positioned within the space.
9. The fluid line detection system of claim 4 , further comprising a third light emitter next to the first and second light emitters, and having a third optical axis arranged at an oblique angle relative to the sensor optical axis.
10. The fluid line detection system of claim 9 , where the oblique angle is about 110-120 degrees.
11. The fluid line detection system of claim 9 , wherein a calibration light level is detected by the optical sensor when the distal end of the fluid line is absent from the space, and wherein the optical sensor and third light emitter are arranged so that a light level detected by the optical sensor is over about 150% of the calibration light level when the distal end of the fluid line contains no liquid, and is less than about 125% of the calibration light level when the distal end of the fluid line contains the liquid.
12. The fluid line detection system of claim 9 , wherein the optical sensor and third light emitter are arranged so that a light level detected by the optical sensor is greater than a pre-determined threshold level when the distal end of the fluid line in the space contains no liquid, and is less than the threshold level when the distal end of the fluid line in the space contains the liquid.
13. The fluid line detection system of claim 12 , wherein the threshold level is about 125-150% of a light level detected by the optical sensor when the distal end of the fluid line is absent from the space.
14. The fluid line detection system of claim 4 , wherein positioning of the first light emitter and second light emitter is arranged so that the optical sensor detects a first light level from the first light emitter when the distal end of the fluid line is not positioned in the space and detects a second light level from the first light emitter that is lower than the first light level when the distal end of the fluid line is positioned in the space.
15. The fluid line detection system of claim 4 , wherein positioning of the first and second light emitters is arranged so that the optical sensor detects a light level from the first and second light emitters that is within about 15-20% of a calibration light level from the first and second light emitters when the distal end of the fluid line is absent from the space.
16. The fluid line detection system of claim 2 , wherein the first and second light emitters are light emitting diodes.
17. The fluid line detection system of claim 1 , wherein the distal end of the patient line has a cylindrical flexible outer surface and the fluid line detector is arranged to hold the distal end of the patient line without substantially deforming the distal end of the patient line.
18. The fluid line detection system of claim 1 , wherein the fluid line detector is arranged to detect the presence and absence of the fluid line, and the presence and absence of liquid in the distal end of the fluid line.
19. The fluid line detection system of claim 1 , wherein the first portion of the distal end connector has a different size and/or shape than the fluid line at the distal end, and a tubing portion of the open, U-shaped channel that receives the distal end of the fluid line connected to the first portion of the distal end connector and the first portion of the distal end connector are configured such that the distal end connector is not receivable within the tubing portion of the open, U-shaped channel.
20. The fluid line detection system of claim 1 , wherein the first portion of the distal end connector removably received by the open, U-shaped channel is wider than the distal end of the fluid line connected to the first portion of the distal end connector.
21. The fluid line detection system of claim 1 , wherein the distal end connector includes a connector cap.
22. The fluid line detection system of claim 21 , wherein a portion of the fluid line detector conforms to the shape of the connector cap.