**I. Primary Application Scenarios**
Especially appropriate for clinically difficult blood collection situations:
- **Patients With Special Vascular Conditions:** Infants, geriatric patients, individuals with obesity, those possessing fragile or delicate veins, and long-term chemotherapy recipients.
- **Special Blood Collection Sites:** Superficial venous punctures at locations including dorsal hand veins, scalp veins (in pediatric cases), and dorsal foot veins.
- **Frequent or Intermittent Blood Collection:** Continuous monitoring in Intensive Care Units (ICU) or Neonatal Intensive Care Units (NICU).
- **Blood Culture Specimen Collection:** The stable tubing configuration facilitates sterile inoculation into multiple culture containers.
- **Patients With Limited Cooperation:** The tubing's cushioning design suits individuals who are anxious or unable to stay entirely motionless.
**II. Specifications and Key Operational Points**
**Common Specifications**
- **Needle Specifications:** 20G to 25G (a lower G value corresponds to a finer needle).
- **Tubing Length:** Typically 18cm, 30cm, or shorter variants.
- **Interface Types:** Direct vacuum tube connection interface, syringe interface, or universal interface with connecting tubing.
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