Medical treatment system and methods using a plurality of fluid lines

A tubing state detector comprising:

• a detector housing having an outward side comprising a connector holding channel for a connector located on a distal end of a tubing segment and a tube portion to receive the tubing segment, the connector having a first portion connected to the distal end of the tubing segment and a second portion for direct connection to a patient catheter;
• the detector housing having an opposing inner side comprising a cavity in which a plurality of sensor elements are positioned;
• the sensor elements comprising one or more light emitters and an optical sensor, each said emitter and the optical sensor positioned adjacent to a transparent or translucent portion of the detector housing and configured for the optical sensor to sense light from the one or more light emitters;
• the connector holding channel comprising a cradle substantially conforming to a shape of the connector and configured to secure the connector within the connector holding channel;
• the tube portion is axially aligned with the connector holding channel and positioned below the connector holding channel;
• wherein the tubing state detector is arranged to detect the presence of the tubing segment or connector after the connector is placed within the connector holding channel.

A tubing state detector comprising:

• a detector housing having an outward side comprising a connector holding channel for a connector located on a distal end of a tubing segment, the connector having a first portion connected to the distal end of the tubing segment and a second portion for direct connection to a patient catheter, the detector housing further including a tube portion for receiving the tubing segment connected to the first portion of the connector, the connector holding channel being positioned above the tube portion of the detector housing;
• the detector housing having an opposing inner side comprising a cavity in which a plurality of sensor elements are positioned;
• the sensor elements comprising one or more light emitters and an optical sensor configured for the optical sensor to sense light emitted from the one or more light emitters, each said light emitter and the optical sensor positioned adjacent to a transparent or translucent portion of the tube portion of the detector housing such that the emitted light is transmitted through the tubing segment;
• and
• the connector holding channel comprising a cradle substantially conforming to a shape of the connector and configured to secure the connector within the connector holding channel;
• wherein the tubing state detector is arranged to detect the presence of the tubing segment after the connector is placed within the connector holding channel.