Please assess the completion status of the following clinical trial:

Trial Title: ED50 of Cis-atracurium for Laryngeal Mask Incubation in General Anesthesia

Study Design Characteristics:
- Allocation: None
- Intervention Model: None
- Observational Model: COHORT
- Primary Purpose: None
- Time Perspective: PROSPECTIVE
- Masking: None
- Phase: None
- Number of Arms: None

Eligibility Criteria:
Inclusion Criteria:~1. ASA Ⅱ\~Ⅲlevel;~2. BMI18.5-30；~3. Those who intend to undergo short urological surgery ( operation time \< 1h );~4. Age 25\~75 years~5. Estimated amount of bleeding \< 5ml / kg.~Exclusion Criteria:~1. Neuromuscular diseases or metabolic diseases;~2. Preoperative complicated with water and electrolytes disorders ( such as hypokalemia and hypocalcemia );~3. Serious hepatic and renal insufficiency and serious heart and lung diseases;~4. Predictable difficult airway;~5. Take drugs ( such as aminoglycoside, polymyxin, phenytoin sodium, carbamazepine, etc. ) that affect the nerve-muscle transmission function or the efficacy of muscle relaxants before surgery;~6. Muscle relaxation drug allergy;~7. Previous history of alcoholism or drug abuse.

- Gender: ALL
- Minimum Age: 25 Years
- Maximum Age: 75 Years
- Healthy Volunteers: f

Study Arms:
- 0.15mg/ kg group (Type: None): Administration method of cis-atracurium: the dose of the first patient is 0.15 mg / kg, and the ratio between adjacent doses is 1.5. If the laryngeal mask insertion condition of this patient is satisfactory, the next patient will use the lower dose. If the laryngeal mask insertion condition of this patient is not satisfactory, the next patient will use a higher dose. Starting from the first case of dissatisfaction, the number of observation units is counted. Dissatisfaction - satisfaction occurs at 7 exchange points and then the test ends.
- 0.1mg/ kg group (Type: None): Administration method of cis-atracurium: the dose of the first patient is 0.15 mg / kg, and the ratio between adjacent doses is 1.5. 0.15/1.5=0.1 ( If the laryngeal mask insertion condition of this patient is satisfactory, the next patient will use the lower dose. If the laryngeal mask insertion condition of this patient is not satisfactory, the next patient will use a higher dose. Starting from the first case of dissatisfaction, the number of observation units is counted. Dissatisfaction - satisfaction occurs at 7 exchange points and then the test ends.)
- 0.07mg/ kg group (Type: None): Administration method of cis-atracurium: the dose of the first patient is 0.15 mg / kg, and the ratio between adjacent doses is 1.5. 0.1/1.5=0.0667 ( If the laryngeal mask insertion condition of this patient is satisfactory, the next patient will use the lower dose. If the laryngeal mask insertion condition of this patient is not satisfactory, the next patient will use a higher dose. Starting from the first case of dissatisfaction, the number of observation units is counted. Dissatisfaction - satisfaction occurs at 7 exchange points and then the test ends.)
- 0.05mg/ kg group (Type: None): Administration method of cis-atracurium: the dose of the first patient is 0.15 mg / kg, and the ratio between adjacent doses is 1.5. 0.07/1.5=0.0466( If the laryngeal mask insertion condition of this patient is satisfactory, the next patient will use the lower dose. If the laryngeal mask insertion condition of this patient is not satisfactory, the next patient will use a higher dose. Starting from the first case of dissatisfaction, the number of observation units is counted. Dissatisfaction - satisfaction occurs at 7 exchange points and then the test ends.)
- 0.03mg/ kg group (Type: None): Administration method of cis-atracurium: the dose of the first patient is 0.15 mg / kg, and the ratio between adjacent doses is 1.5. 0.05/1.5=0.0333 ( If the laryngeal mask insertion condition of this patient is satisfactory, the next patient will use the lower dose. If the laryngeal mask insertion condition of this patient is not satisfactory, the next patient will use a higher dose. Starting from the first case of dissatisfaction, the number of observation units is counted. Dissatisfaction - satisfaction occurs at 7 exchange points and then the test ends.)
- 0.02mg/ kg group (Type: None): Administration method of cis-atracurium: the dose of the first patient is 0.15 mg / kg, and the ratio between adjacent doses is 1.5. 0.03/1.5=0.02( If the laryngeal mask insertion condition of this patient is satisfactory, the next patient will use the lower dose. If the laryngeal mask insertion condition of this patient is not satisfactory, the next patient will use a higher dose. Starting from the first case of dissatisfaction, the number of observation units is counted. Dissatisfaction - satisfaction occurs at 7 exchange points and then the test ends.)

Based on this trial design, predict the completion outcome and termination type (if applicable).