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Method and apparatus for coating of substrates |
| RE40722 |
Method and apparatus for coating of substrates
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| Patent Drawings: | |
| Inventor: |
Chappa |
| Date Issued: |
June 9, 2009 |
| Application: |
11/823,055 |
| Filed: |
June 26, 2007 |
| Inventors: |
Chappa; Ralph A. (Prior Lake, MN)
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| Assignee: |
SurModics, Inc. (Eden Prairie, MN) |
| Primary Examiner: |
Fletcher, III; William Phillip |
| Assistant Examiner: |
Sellman; Cachet I |
| Attorney Or Agent: |
Pauly, DeVries Smith & Deffner, L.L.C. |
| U.S. Class: |
427/2.24; 118/300; 118/311; 118/320; 427/2.1; 427/421.1; 427/425 |
| Field Of Search: |
427/2.24; 427/2.1; 427/421.1; 118/300; 118/320; 118/311 |
| International Class: |
A61L 33/00; B05D 1/02 |
| U.S Patent Documents: |
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| Foreign Patent Documents: |
2351016; 33 35 502; 33 35 502; WO-00/01322; WO-01/32382; WO-01/32382; WO-02/20174; WO-02/20174; WO-03/004072; WO-03/004072; WO-2004/028579; WO-2004/028699; WO-2004/037443; WO-2004/037443 |
| Other References: |
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| Abstract: |
The invention relates to methods and apparatuses that reduce problems encountered during coating of a device, such as a medical device having a cylindrical shape. In an embodiment, the invention includes an apparatus including a bi-directional rotation member. In an embodiment, the invention includes a method with a bi-directional indexing movement. In an embodiment, the invention includes a coating solution supply member having a major axis oriented parallel to a gap between rollers on a coating apparatus. In an embodiment, the invention includes a device retaining member. In an embodiment, the invention includes an air nozzle or an air knife. In an embodiment, the invention includes a method including removing a static charge from a small diameter medical device. |
| Claim: |
I claim:
1. A method for coating a stent comprising the steps of: a) placing the stent on a device rotator, the device rotator comprising a pair of rollers, the pair comprising a first rollerand a second roller separated by a gap not wider than the device; b) disposing a coating material on the stent, comprising spraying a coating material from a nozzle, wherein the nozzle is arranged to direct spray at the gap; c) rotating the stent afirst amount of rotation by rotating at least one of the first or second rollers in a first direction, the first amount of rotation sufficient to release sticking between the stent and the first or second roller; and d) rotating the stent a secondamount of rotation by rotating at least one of the first or second rollers in a second direction, the first direction being opposite of the second direction; wherein the second amount of rotation is greater than the first amount of rotation.
2. The method of claim 1, further comprising repeating steps b) through d) a plurality of times.
3. The method of claim 1, further comprising moving the nozzle in a direction parallel to the first roller.
4. The method of claim 3, wherein the steps of disposing and moving are performed simultaneously.
5. The method of claim 1, wherein step c) is performed prior to the coating material being dry.
6. The method of claim 1, the nozzle comprising a sonicating member.
7. The method of claim 6, the sonicating member comprising a channel for gas flow.
8. The method of claim 1, the coating material comprising a material selected from the group consisting of poly(ethylene-co-vinyl acetate) and poly(n-butyl methacrylate).
9. The method of claim 1, the coating material comprising an active agent.
10. The method of claim 1, further comprising regulating the humidity, temperature, or both, around the stent.
11. The method of claim 1, the stent having a cylindrical shape and no greater than 2.0 mm in diameter.
12. The method of claim 1, wherein the steps are performed as part of a batch process for coating a plurality of medical devices. |
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