We claim:
1. An expandable stent for implantation in a patient comprising a tubular metal body having open ends and a sidewall structure having openings therein and a coating disposed on a surface of said sidewall structure, said coating comprising a hydrophobic biostable elastomeric material and a biologically active material, wherein said coating continuously conforms to said structure in a manner that preserves said openings.
2. The stent of claim 1, wherein said coating is about 20 to about 200 m in thickness.
3. The stent of claim 1, wherein the coating continuously conforms to the structure in a manner that preserves said openings when the stent expanded.
4. The stent of claim 1, wherein the coating is applied to the surface of the sidewall structure by spraying a coating composition comprising a mixture of finely divided biologically active species and an about 4 to 6 wv % dispersion of uncured hydrophobic biostable elastomeric material in a solvent.
5. The stent of claim 1, wherein said coating is about 75 to about 200 m in thickness.
6. The stent of claim 1, wherein said coating is applied with said stent fully expanded.
7. The stent of claim 1, wherein said coating is applied with said stent rotated.
8. The stent of claim 1, wherein said stent is a self-expandable stent.
9. The stent of claim 1, wherein the metal is selected from the group consisting of stainless steel, titanium alloys, tantalum, and cobalt-chrome alloys.
10. The stent of claim 1, wherein the biostable elastomeric material is selected from the group consisting of polysiloxanes, polyurethanes, thermoplastic elastomers, ethylene vinyl acetate copolymers, polyolefin elastomers, ethylene-propylene terpolymer rubbers and combinations thereof.
11. The stent of claim 1, wherein the biostable elastomeric material is a polysiloxane and wherein said biologically active species is selected from the group consisting of heparin and dexamethasone.
12. An expandable stent for implantation in a patient comprising a tubular metal body having open ends and a sidewall structure having openings therein and a coating on a surface of said sidewall structure, said coating comprising a hydrophobic biostable elastomeric material and a biologically active material, wherein said openings are substantially free of webbing.
13. The stent of claim 1, wherein said coating is about 20 to about 200 m in thickness.
14. The stent of claim 12, wherein said openings are substantially in the shape of a parallelogram with first and third sides that are substantially parallel and second and fourth sides that are substantially parallel, and wherein said openings are substantially free of webbing such that any imaginary line extended orthogonally from said first side to said third side does not intersect said coating extending between said second and fourth sides.
15. The stent of claim 12, wherein the coating is applied to the surface of the sidewall structure by spraying a coating composition comprising a mixture of finely divided biologically active species and an about 4 to 6 wv % dispersion of uncured hydrophobic biostable elastomeric material in a solvent.
16. The stent of claim 12, wherein said coating is about 75 to about 200 m in thickness.
17. The stent of claim 12, wherein said coating is applied with said stent fully expanded.
18. The stent of claim 12, wherein said coating is applied with said stent rotated.
19. The stent of claim 12, wherein said stent is a self-expandable stent.
20. The stent of claim 12, wherein the metal is selected from the group consisting of stainless steel, titanium alloys, tantalum, and cobalt-chrome alloys.
21. The stent of claim 12, wherein the biostable elastomeric material is selected from the group consisting of polysiloxanes, polyurethanes, thermoplastic elastomers, ethylene vinyl acetate copolymers, polyolefin elastomers, ethylene-propylene terpolymer rubbers and combinations thereof.
22. The stent of claim 12, wherein the biostable elastomeric material is a polysiloxane and wherein said biologically active material is selected from the group consisting of heparin and dexamethasone.
23. A self-expandable stent for implantation in a patient comprising a tubular metal body having open ends and a sidewall structure having openings therein and a coating of about 75 to about 200 m in thickness on a surface of said sidewall structure, said coating comprising a biologically active material and a hydrophobic biostable elastomeric material selected from the group consisting of polysiloxanes, polyurethanes, thermoplastic elastomers, ethylene vinyl acetate copolymers, polyolefin elastomers, ethylene-propylene terpolymer rubbers and combinations thereof, wherein said coating continuously conforms to said structure in a manner that preserves said openings.
24. The stent of claim 23, wherein the coating continuously conforms to the structure in a manner that the openings are substantially free of webbing.
25. The stent of claim 23, wherein the coating continuously conforms to the structure in a manner that preserves the openings when the stent expanded.
26. The stent of claim 23, wherein said coating is applied to the surface of the sidewall structure while the stent is fully expanded and rotated by spraying, with an air brush with its pressure adjusted to from about 15 to about 25 psi, a coating composition comprising a mixture of finely divided biologically active species and a dispersion of uncured hydrophobic biostable elastomeric material in a solvent and then cured.
27. The stent of claim 23, wherein the stent is rotated at the speeds in the range of about 30 to about 50 rpm.
28. The stent of claim 23, wherein the coating composition is sprayed at a spray nozzle flow rate in the range of about 4 to about 10 ml.
29. The stent of claim 23, wherein the coating comprises more than one coating layer.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. An erectable, collapsible shelter having a collapsed configuration and an extended configuration, comprising:
a canopy having at least three sides and three corners;
a leg assembly having at least three legs supporting said canopy, said legs having an upper end and a lower end;
a perimeter truss linkage assembly having a plurality of perimeter truss pairs of link members connected to said leg assembly; and
a canopy peak support assembly movable between a raised position and a lowered position, said canopy peak support assembly supporting said canopy above the top of the leg assembly in said raised position.
2. The erectable, collapsible shelter of claim 1, wherein each of said legs comprise telescoping upper and lower sections, with said lower section being adapted for engagement with the ground.
3. The erectable, collapsible shelter of claim 1, wherein said leg assembly comprises a slider member slidably mounted to each of said legs.
4. The erectable, collapsible shelter of claim 1, wherein each of said perimeter truss pairs includes first and second link members pivotally connected together in a scissors configuration, said first and second link members having inner and outer ends, said outer end of each said first link member connected to the upper end of one said leg, and said outer end of each second link slidably connected to said leg.
5. The erectable, collapsible shelter of claim 1, wherein said canopy peak support assembly comprises a plurality of telescoping pole members having first and second ends, said first ends of said telescoping pole members being pivotally connected together, and said second ends of said telescoping pole members being pivotally connected to the leg assembly such that said telescoping pole members can moved between a downwardly directed position and an upwardly directed position supporting said canopy.
6. The erectable, collapsible shelter of claim 5, wherein said first ends of said telescoping pole members are pivotally connected together by a bracket member adapted for supporting said canopy.
7. The erectable, collapsible shelter of claim 5, wherein each of said telescoping pole members comprises hollow first and second telescoping sections, said first telescoping section slidably disposed within said second telescoping section and having a distal end for supporting said canopy and a proximal end, said second telescoping section having a spring loaded detent pin and an aperture for receiving said spring loaded detent pin, said first telescoping section having a corresponding medially located aperture located medially of said proximal end for receiving said spring loaded detent pin, whereby when said apertures of said first and second telescoping sections are aligned, said first and second telescoping sections are locked together by said detent pin.
8. The erectable, collapsible shelter of claim 7, wherein said first telescoping section further comprises a weighted internal stop member slidably disposed within said first telescoping section for movement between a first position blocking said detent pin when said first telescoping section is below said second telescoping section and a second position not blocking said detent pin when said first telescoping section is above said second telescoping section.
9. The erectable, collapsible shelter of claim 8, wherein said weighted internal stop member being retained in said first telescoping section between first and second stop members disposed within said first telescoping section
10. The erectable, collapsible shelter of claim 7, wherein said first telescoping section comprises a second aperture for receiving said spring loaded detent pin proximal to said medially located aperture, said surface of said first telescoping section defining a second aperture and a ramped channel for receiving said detent pin extending and becoming shallower distally from said second aperture, such that when said detent pin is received in said second aperture, said detent pin locks said first and second telescoping sections from being disengaged, and said detent pin can slide distally from said second aperture along said channel.
11. An erectable, collapsible shelter having a collapsed configuration and an extended configuration, comprising:
a canopy having at least three sides and three corners;
a leg assembly having at least three legs supporting said canopy, said legs having an upper end and a lower end;
a perimeter truss linkage assembly having a plurality of perimeter truss pairs of link members connected to said leg assembly; and
a canopy peak support assembly movable between a raised position and a lowered position, said canopy peak support assembly supporting said canopy above the top of the leg assembly in said raised position, said canopy peak support assembly including a plurality of telescoping pole members having first and second ends, said first ends of said telescoping pole members being pivotally connected together, and said second ends of said telescoping pole members being pivotally connected to the leg assembly such that said telescoping pole members can moved between a downwardly directed position and an upwardly directed position supporting said canopy..
12. The erectable, collapsible shelter of claim 11, wherein each of said legs comprise telescoping upper and lower sections, with said lower section being adapted for engagement with the ground.
13. The erectable, collapsible shelter of claim 11, wherein said leg assembly comprises a slider member slidably mounted to each of said legs.
14. The erectable, collapsible shelter of claim I 1, wherein each of said perimeter truss pairs includes first and second link members pivotally connected together in a scissors configuration, said first and second link members having inner and outer ends, said outer end of each said first link member connected to the upper end of one said leg, and said outer end of each second link slidably connected to said leg.
15. The erectable, collapsible shelter of claim 11, wherein said first ends of said telescoping pole members are pivotally connected together by a bracket member adapted for supporting said canopy.
16. The erectable, collapsible shelter of claim 11, wherein each of said telescoping pole members comprises hollow first and second telescoping sections, said first telescoping section slidably disposed within said second telescoping section and having a distal end for supporting said canopy and a proximal end, said second telescoping section having a spring loaded detent pin and an aperture for receiving said spring loaded detent pin, said first telescoping section having a corresponding medially located aperture located medially of said proximal end for receiving said spring loaded detent pin, whereby when said apertures of said first and second telescoping sections are aligned, said first and second telescoping sections are locked together by said detent pin.
17. The erectable, collapsible shelter of claim 16, wherein said first telescoping section further comprises a weighted internal stop member slidably disposed within said first telescoping section for movement between a first position blocking said detent pin when said first telescoping section is below said second telescoping section and a second position not blocking said detent pin when said first telescoping section is above said second telescoping section.
18. The erectable, collapsible shelter of claim 17, wherein said weighted internal stop member being retained in said first telescoping section between first and second stop members disposed within said first telescoping section
19. The erectable, collapsible shelter of claim 16, wherein said first telescoping section comprises a second aperture for receiving said spring loaded detent pin proximal to said medially located aperture, said surface of said first telescoping section defining a second aperture and a ramped channel for receiving said detent pin extending and becoming shallower distally from said second aperture, such that when said detent pin is received in said second aperture, said detent pin locks said first and second telescoping sections from being disengaged, and said detent pin can slide distally from said second aperture along said channel.