Abstract: A safety syringe adapted consists of an outer casing that supports a conventional hypodermic needle and an inner casing which supports a blunt cannula that is disposed inside the inner lumen of the hypodermic needle. The inner casing is keyed to the outer casing by one or more pins that engage helical tracks formed along the inner surface of the outer casing. Rotation of the inner casing relative to the outer casing advances the inner casing so that the blunt cannula is moved from a retracted position within the needle to an extended position in which the blunt end of the cannula extends beyond the tip of the needle.

Abstract: A safety syringe adapted consists of an outer casing that supports a conventional hypodermic needle and an inner casing which supports a blunt cannula that is disposed inside the inner lumen of the hypodermic needle. The inner casing is keyed to the outer casing by one or more pins that engage helical tracks formed along the inner surface of the outer casing. Rotation of the inner casing relative to the outer casing advances the inner casing so that the blunt cannula is moved from a retracted position within the needle to an extended position in which the blunt end of the cannula extends beyond the tip of the needle.

Abstract: The device of the present invention is a bite block for use with endotracheally intubated patients. The bite block is generally U-shaped and made of a hard but pliable material. The termini of each of the legs of the "U" are wedge shaped, being thinner at the terminus of each leg. A curved rib connects the two legs. The combination of the wedge-shaped legs and the curved rib allow the interjaw compressive forces to be borne by the molars rather than the incisors or front teeth.