1. An effective method which is simply and widely used is adopted in vernier adjustment technology for the request of angulate symmetry or turning round synchronism.

2. Capsule subglobose, ca. 9 mm in diam. , valves slightly smooth and flat, not obviously angulate .

3. Herbs annual. Stems decumbent or erect, 30-90 cm tall, branched, angulate , with sparse retrorse prickles along angles.

4. Independently, the present invention provides methods and mechanisms in which the chin support can angulate independently of the collar body.

5. Main Outcome Measurements: The capsule was manipulated in the esophagus for 10 minutes. It was easy to make the capsule turn somersaults and to angulate at the cardioesophageal junction.