A catheter suitable for delivering an electric current to the oesophagus of a person with dysphagia is disclosed. A sleeve (3) has electrodes (4) that can be positioned independently of the main elongate shaft of the catheter by relative movement of the sleeve on the catheter. The movable sleeve (3) can be fixed in place on the shaft. The invention also relates to methods for positioning electrodes at a treatment site in the body for diagnostic or therapeutic applications, particularly electrical pharyngeal stimulation. A feeding tube may also be supplied in the shaft. Separate nutritional and stimulation functionality allows for the stimulation function, i.e. electrode carrying sleeve, to be removed from the patient on completion of electrical treatment, whilst the feeding tube remains in position in the patient. The use of pressure sensors for the detection of high pressure in the upper oesophagus sphincter of patient is also disclosed.
