A tracheostomy dilator moulded from a plastics material is formed with an S shape having a flexible, tapered patient end region 3 for insertion to the trachea. A handle region 5 at the opposite end has a substantially constant diameter along its length. A passage 10 along the dilator receives a guide member, the tip 2 of the patient end 3 of the dilator making a stepless transition with the surface of the guide member.
