| 摘要 |
A stick-free blood collection system (10) includes elongated inner sheaths (14), and outer sheaths (12), and a syringe, including a needle and blood collection tube (21), mounted with the inner sheath. The inner sheath, and hence the syringe, are axially moveable within the outer sheath. The outer sheath has a small aperture (32) at the distal end thereof to permit passage of the needle through the outer sheath and into the patient. The outer sheath also includes an angled flat portion (30) at the distal end to mount the outer sheath onto the patient in a practical fashion whereby the needle can be telescopically injected into the patient. During operation, the outer sheath is mounted at an angle relative to the surface of the patient, and the needle enters the surface at that angle to draw blood therein. The inner and outer sheaths have mating interconnections which engage when a user twists the inner sheath relative to the outer sheath, thereby preventing axial displacement of one sheath relative to the other sheath. |
