| 摘要 |
A cylinder-piston unit, with at least one cylinder accommodating an injection solution and having an outlet opening, and with at least one piston. The cylinder, or a component mounted upstream of the cylinder, has an end face from which, during correct emptying of the cylinder-piston unit, a short cannula protrudes, which has an outlet opening at its free end. The outlet opening has a surface with a border which has a point near the bottom or an edge near the bottom. The point near the bottom or the edge near the bottom lies 0.15-0.3 mm away from the end face or the front-most point or edge thereof. A cylinder-piston unit is developed which is intended for a disposable injector and which is suitable for virtually painless penetration of the human skin, among other reasons for the administration of highly viscous injection solutions. |
| 主权项 |
1. Cylinder-piston unit (10), with at least one cylinder (20) accommodating an injection solution and having an outlet opening (71), and with at least one piston (80), the improvement which comprises:
the cylinder (20), or a component (110) mounted upstream of the cylinder (20), has an end face (46, 113) from which, during correct emptying of the cylinder-piston unit (10), a short cannula (61) protrudes, which has an outlet opening (71) at its free end, the short cannula (61) in fluid communication with the cylinder (20); the outlet opening (71) has a surface with a border (72) which has a point (74) near the bottom or an edge (76) near the bottom, and the point (74) near the bottom or the edge (76) near the bottom lies 0.15-0.3 mm away from the end face (46, 113) or the front-most point or edge (44) thereof. |
