Syringe with PECVD lubrication
A syringe or other vessel having a substrate surface coated by PECVD is provided. The PECVD coating is made by generating plasma from a gaseous reactant comprising an organosilicon precursor and optionally O 2 . The lubricity, hydrophobicity and/or barrier properties of the coating are set by setting the ratio of the O 2 to the organosilicon precursor in the gaseous reactant, and/or by setting the electric power used for generating the plasma. In particular, a lubricity coating made by said method is provided. Vessels coated by said method and the use of such vessels protecting a compound or composition contained or received in said coated vessel against mechanical and/or chemical effects of the surface of the uncoated vessel material are also provided.
1. A syringe comprising a barrel and a plunger, the barrel having an interior surface coated at least in part with a lubricity coating made by:
(a) providing a gas comprising a monocyclic siloxane, O 2 , and a noble gas, in the vicinity of the interior surface; and
(b) generating a plasma in the gas using charged electrodes, thus forming a coating on the interior surface by plasma enhanced chemical vapor deposition (PECVD) under conditions effective to form a lubricity coating on the interior surface comprising a crosslinked monocyclic siloxane chemical structure and having a plunger initiation force Fi of 4.8 to 11 N;
wherein the conditions effective include: a ratio of the O 2 to the monocyclic siloxane, a power used for generating the plasma, a ratio of the noble gas to the monocyclic siloxane, or any combination thereof.
2. The syringe of claim 1 , in which the plunger initiation force F i is from 5.1 to 11 N.
3. The syringe of claim 1 , in which the plunger initiation force F i is from 5.4 to 11 N.
4. The syringe of claim 1 , in which a plunger maintenance force F m is from 3.5 to 11 N.
5. The syringe of claim 1 , in which a plunger maintenance force F m is from 4.3 to 11 N.
6. The syringe of claim 1 , in which a plunger maintenance force F m is from 4.4 to 11 N.
7. The syringe according to claim 1 which contains a medicament in contact with the lubricity coating.
8. The syringe of claim 1 , wherein the lubricity coating has an atomic ratio Si w O x C y or Si w N x C y wherein w is 1, x is from about 0.5 to about 2.4, and y is from about 0.6 to about 3.
9. The syringe of claim 1 , wherein the lubricity coating has an average thickness of from 10 to 1000 nm.
10. The syringe of claim 1 , wherein the syringe barrel is COC, wherein the gas in step (a) comprises octamethylcyclotetrasiloxane, O 2 and Ar, and wherein the plasma is generated by applying a power density from 6 W/ml to 0.1 W/ml in relation to the volume of the syringe lumen.
11. The syringe of claim 1 , which contains a medicament.
12. The syringe of claim 1 , in which the monocyclic siloxane comprises octamethylcyclotetrasiloxane (OMCTS).