Syringe
First Claim
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1. A syringe comprising:
- a barrel,a gasket contacting tightly with an inner surface of the barrel,a plunger extending from the gasket to a rear end of the syringe for sliding the gasket in the barrel, the inner surface of the barrel being coated with a lubricant containing a straight silicone oil as a main component, a fine silica powder, and a nonionic surfactant, the lubricant containing 5 to 20% by weight of the fine silica powder and 0.1 to 15% by weight of the nonionic surfactant, andthe syringe being adapted to inject a drug solution containing a drug having a surface activity.
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Accused Products
Abstract
A syringe coated with a lubricant containing a silicone oil and a fine silica powder on the inner surface of the barrel of the syringe can be used for injection of a surface-active drug solution without oil droplet formation on the inner surface while preventing an increase of the gasket sliding friction.
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Citations
8 Claims
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1. A syringe comprising:
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a barrel, a gasket contacting tightly with an inner surface of the barrel, a plunger extending from the gasket to a rear end of the syringe for sliding the gasket in the barrel, the inner surface of the barrel being coated with a lubricant containing a straight silicone oil as a main component, a fine silica powder, and a nonionic surfactant, the lubricant containing 5 to 20% by weight of the fine silica powder and 0.1 to 15% by weight of the nonionic surfactant, and the syringe being adapted to inject a drug solution containing a drug having a surface activity. - View Dependent Claims (2, 3, 4, 5)
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6. A prefilled syringe comprising:
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a barrel, a gasket contacting tightly with an inner surface of the barrel, a plunger extending from the gasket to a rear end of the syringe for sliding the gasket in the barrel, the inner surface of the barrel being coated with a lubricant containing a straight silicone oil as a main component, a fine silica powder, and a nonionic surfactant, the lubricant containing 5 to 20% by weight of the fine silica powder and 0.1 to 15% by weight of the nonionic surfactant, and the syringe being filled with a drug solution containing a drug having a surface activity. - View Dependent Claims (7, 8)
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Specification