The description relates to self-dispensing electrodes. One example can include a curved hollow tube configured to hold a flowable conductive material and a selective retention mechanism positioned on the curved hollow tube and configured to retain the flowable conductive material in the hollow tube unless a force is imparted on the curved hollow tube.

A sensor includes a probe that acquires a blood light absorber concentration in a subject and a cuff that acquires a non-invasive blood pressure of the subject. In the sensor, the probe is configured to be attached to a first portion of a digit of the subject, and the cuff is configured to be attached to a second portion of the digit, the second portion being located on a periphery side with respect to the first portion.

A system useful for in vivo and ex vivo spectroscopy comprises a water source connected to supply water through a passage to an outlet at a flow rate sufficient to issue a laminar water jet from the outlet, a light source operative to emit a light beam that is guided to a sample by the water jet, and an analysis unit connected to receive collected light that has been emitted from the sample into the water jet and operable to analyze the collected light. Some embodiments provide endoscopes with integrated light guides.

The description relates to self-dispensing electrodes. One example can include a curved hollow tube configured to hold a flowable conductive material and a selective retention mechanism positioned on the curved hollow tube and configured to retain the flowable conductive material in the hollow tube unless a force is imparted on the curved hollow tube.