Coating processes – Medical or dental purpose product; parts; subcombinations;... – Implantable permanent prosthesis
Reexamination Certificate
2002-01-14
2004-01-27
Beck, Shrive P. (Department: 1762)
Coating processes
Medical or dental purpose product; parts; subcombinations;...
Implantable permanent prosthesis
C427S002100, C427S002250, C427S002280, C427S002300, C427S261000, C427S286000, C427S287000, C427S256000, C427S258000, C427S259000, C427S282000, C427S409000
Reexamination Certificate
active
06682771
ABSTRACT:
FIELD OF THE INVENTION
The present invention generally regards the coating of work-pieces. More particularly, the present invention regards a method and system for precision coating implantable medical appliances using a solenoid type fluid dispensing head.
BACKGROUND INFORMATION
The positioning and deployment of medical appliances within a target site of a patient is a common, often-repeated procedure of contemporary medicine. These appliances or implants are used for innumerable medical purposes including the reinforcement of recently re-enlarged lumens and the replacement of ruptured vessels.
Coatings are often applied to these medical appliances to increase their effectiveness. These coatings may provide a number of benefits including reducing the trauma suffered during the insertion procedure, facilitating the acceptance of the medical appliance into the target site, and improving the post-procedure effectiveness of the appliance.
Expandable stents, stent grafts, balloon delivery systems, and aneurism coils are specific examples of medical appliances or implants that may be coated and inserted within the body. Expandable stents are tube-like medical appliances that often have a mesh-like structure designed to support the inner walls of a lumen. These stents are typically positioned within a lumen and, then, expanded to provide internal support for it. Because of the direct contact of the stent with the inner walls of the lumen, stents have been coated with various compounds and therapeutics to enhance their effectiveness. When this coating is haphazardly applied or has somehow been removed during the stent's manufacture or delivery, the stent's effectiveness can be compromised. In certain circumstances, defective implanted stents must be removed and replaced through a second medical procedure—an unwanted result.
Indiscriminate coating methods such as dip-coating and spray-coating have been used to coat stents as well as other medical appliances. These methods are, however, both wasteful and difficult to control. For example, dipping can result in non-uniform application of the coating to the appliance, thereby placing more coating at one end or region of the stent and making it difficult to predict the dosage of therapeutic that will be delivered when the stent or other appliance is implanted. The indiscriminate nature of dipping is also problematic as it may lead to the cracking and crumbling of coating at the junctions, hinges, and flexing members of the mesh-like stents. The coating that covers the hinged portions of the stent is highly susceptible to exfoliation because, as the stent is expanded, intolerable stresses may develop within the coating.
FIGS. 1 and 2
are illustrative of some of the concerns stemming from an indiscriminate coating process like dipping. In
FIG. 1
, stent
11
is shown in a closed, pre-deployment state. Here, stent
11
has been previously dipped in a vat of therapeutic in the direction of arrow
16
. In other words, the right side of stent
11
was the leading edge entering the dipping vat. As can be seen, the coating of stent
11
is heavier on the right side than on the left side and covers each of the junctions
13
throughout the entire stent
11
. As can also be seen, the coating becomes progressively thicker and covers more of the space between each of struts
12
as you travel from the left side to the right side of stent
11
. This increasing thickness of coating is indicative of a stent that has been dipped and let stand on one of its ends as the coating dries and adheres to the stent.
FIG. 2
shows the unevenly coated stent
11
of
FIG. 1
in an expanded state as it may be after it is positioned within a body. As is evident, the expansion of stent
11
has led to the cracking and crumbling of coating
15
. Also evident is that the coating has been removed from most if not all of the junction points
13
after stent
11
has been expanded.
SUMMARY OF THE INVENTION
A system and method for coating a medical appliance is provided. In accord with one embodiment, a system for applying a coating to a medical appliance having accessible patterned surfaces is provided. This system may include: a processor, an appliance support, and a solenoid type fluid dispensing head having an electromagnetically controlled valve. In this system the appliance support may be adapted to hold the medical appliance and to provide direct access for a coating to contact the exposed external patterned surfaces of the medical appliance. The solenoid type fluid dispensing head in this system may move with respect to the medical appliance and may be in communication with a source of coating and with the processor. The processor in this system may contain commands that instruct the solenoid type fluid dispensing head to force coating onto the accessible patterned surfaces of the medical appliance in a pattern that correlates with the accessible patterned surfaces of the medical appliance.
A method for applying a coating to a medical appliance having an accessible patterned surface is also provided. In one embodiment this method may include holding the medical appliance, providing direct access to the external surfaces of the medical appliance, and receiving command signals that instruct a solenoid type fluid dispensing head to force coating onto the accessible patterned surfaces of the medical appliance in a pattern that correlates with the accessible patterned surfaces of the medical appliance.
REFERENCES:
patent: 4207356 (1980-06-01), Waugh
patent: 4743252 (1988-05-01), Martin, Jr. et al.
patent: 5059266 (1991-10-01), Yamane et al.
patent: 5104400 (1992-04-01), Berguer et al.
patent: 5804083 (1998-09-01), Ishii et al.
patent: 5935331 (1999-08-01), Naka et al.
patent: 6056993 (2000-05-01), Leidner et al.
patent: 6058843 (2000-05-01), Young
patent: 6063339 (2000-05-01), Tisone et al.
patent: 6107004 (2000-08-01), Donadio, III
patent: 6176874 (2001-01-01), Vacanti et al.
patent: 6193923 (2001-02-01), Leyden et al.
patent: 6287628 (2001-09-01), Hossainy et al.
patent: 6395326 (2002-05-01), Castro et al.
patent: 0 850 651 (1998-07-01), None
patent: WO 01/91918 (2001-12-01), None
Rogers, John A, “Microcontact Printing and Electroplating on Curved Substrates: Production of Free-Standing Three-Dimensinal Metallic Microstructures”, 1997, 9, No. 6, pp. 475-477.*
Microdrop Brochure, “undated” “Microdosing of Liquids In The Piko-To Nanoliter-Range”.
P. F. Blazdell, et al., “Application of a continuous ink jet printer to solid freeforming of ceramics” Journal of Materials Processing Technology 99, (2000) pp. 94-102.
Jin Hua Song, et al., “Formulation and Multilayer Jet Printing of Ceramic Inks”, Journal of the American Ceramic Society Incorporating Advanced Ceramic Materials and Communications, vol. 82, No. 12, Dec. 1999, pp. 3374-3380.
Matthew Mott, et al., “Microengineering of Ceramics by Direct Ink-Jet Printing”, Journal of the American Ceramic Society Incorporating Advanced Ceramic Materials and Communications, vol. 82, No. 7, Jul. 1999, pp. 1653-1658.
M. J. Wright, et al., “Ceramic Deposition using and electromagnetic Jet Printer Station”, Journal of Materials Science Letters 18, (1999), pp. 99-101.
D. A. Grigoriev, et al., “Preparation of Silicon Carbide by Electrospraying of a Polymeric Precursor”, vol. 81, No. 4, (2001), pp. 285-291.
P. Miao, “Electrostatic Atomization of Ultra Fine Spray of Ceramic Solution”, Institute of Physics Conference Series No. 163, Proceedings of the 10th International Conference, Cambridge Mar. 28-31, 1999, pp. 119-122.
Kitty A. M. Seerden, et al., “Ink Jet Printing of Wax-Based Alumina Suspensions”, Journal of the American Ceramic Society Incorporating Advanced Ceramic Materials and Communications, vol. 84, No. 11, Nov. 2001, pp. 2514-2520.
J. R. G. Evans, et al., “Combinatorial Searches of Inorganic Materials using the Ink-Jet Printer Science, Philosophy and Technology”, Journal of the European Ceramic Society, vol. 21, No. 13, (2001), pp. 2291-2299.
P. F. Blazdell, et al., “Preparation of Ceramic Inks for Solid Freeforming
Boulais Dennis R.
Kulkarni Praveen
Sahatijian Ron
Zhong Sheng-ping
Beck Shrive P.
Kenyon & Kenyon
Kolb Michener Jennifer
Sci-Med Life Systems, Inc.
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