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A device for coating an exterior of an elongate object includes a housing structure with an elongate chamber having first and second opposite ends. A port communicates with the first end for receiving the elongate object and an outlet is located at the second end. An air supply passage and a coating

A device for coating an exterior of an elongate object includes a housing structure with an elongate chamber having first and second opposite ends. A port communicates with the first end for receiving the elongate object and an outlet is located at the second end. An air supply passage and a coating material supply passage communicate with the elongate chamber. Pressurized air and coating material are adapted to enter the elongate chamber through the air supply passage and the coating material supply passage, respectively, to form a mist in the elongate chamber moving toward the outlet while coating the exterior of the object. A method of coating an exterior surface of the elongate object with the coating material includes holding the elongate object lengthwise in the elongate chamber, mixing the pressurized air and the coating material to form a mist, and coating the exterior surface while directing the mist around the exterior surface and toward the outlet of the elongate chamber.

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1. A device for coating an exterior of an elongate object, comprising: a housing structure including an elongate coating chamber having first and second opposite ends, a port communicating with said first end for receiving the elongate object into the coating chamber and an outlet at said second end

1. A device for coating an exterior of an elongate object, comprising: a housing structure including an elongate coating chamber having first and second opposite ends, a port communicating with said first end for receiving the elongate object into the coating chamber and an outlet at said second end, said elongate coating chamber having at least first and second sections, said first section located closer to said outlet than said second section and said first section having a greater cross sectional area than said second section, the housing structure further including an air supply passage and a coating material supply passage communicating with said elongate coating chamber; anda ring shaped structure communicating between said air supply passage and said elongate coating chamber, said ring shaped structure configured to cause a swirling motion of the pressurized air;wherein pressurized air and coating material are adapted to enter said elongate coating chamber through said air supply passage and said coating material supply passage, respectively, to form a mist of the air and coating material that is directed into said elongate coating chamber and generally toward said outlet while coating the exterior of the elongate object inserted into said elongate coating chamber through said port; and wherein said ring shaped structure further includes a central passage through which the coating material is adapted to be directed into the air moving with the swirling motion to thereby form the mist. 2. The device of claim 1, further comprising: a mixing passage communicating with said air supply passage and said coating material supply passage, said mixing passage further communicating with said elongate coating chamber, wherein pressurized air and coating material are adapted to enter said mixing passage through said air supply passage and said coating material supply passage, respectively, to form the mist of the air and coating material that is directed into said elongate coating chamber and generally toward said outlet while coating the exterior of the object inserted into said elongate coating chamber through said port. 3. The device of claim 2, wherein said elongate coating chamber includes a central axis coaxial with said port, and said mixing passage extends transverse to said elongate coating chamber. 4. The device of claim 1, further comprising a coating material injecting element including a tube with an outlet, said tube extending through said central passage. 5. The device of claim 4, wherein said ring shaped structure further comprises a ring shaped wall surrounding an inner space and disposed around a central axis, and wherein said central passage extends along the central axis, said ring shaped wall further including a plurality of air directing passages communicating between said air supply passage and said inner space and directing the pressurized air into said inner space in the swirling motion around said central axis. 6. The device of claim 1, wherein said ring shaped structure further comprises a plurality of stand-off elements forming additional air passages communicating between said air supply passage and said elongate coating chamber. 7. The device of claim 1, further comprising: a valve member and a valve seat mounted in said coating material supply passage, said valve member movable with respect to said valve seat to selectively supply the coating material to the elongate coating chamber. 8. The device of claim 7, wherein said housing structure further comprises a first sub-housing and a second sub-housing, said first sub-housing being removably coupled to said second sub-housing and containing said elongate coating chamber, and said second sub-housing containing said valve member and said valve seat. 9. The device of claim 1, wherein the elongate object further comprises a hollow needle, and further comprising: a needle holder including an interior air space and a needle holding element configured to secure a first end of the needle in communication with the interior air space while an open second end of the needle extends outwardly from said needle holder for insertion through said port and into said elongate coating chamber, wherein said interior air space is adapted to be pressurized with air to force air through the needle and prevent clogging of the open second end of the needle with the coating material. 10. The device of claim 1, wherein said port is configured to allow additional air to be drawn into said elongate coating chamber as the mist is coating the exterior of the elongate object. 11. A device for coating an exterior of an elongate object, comprising: a housing structure including an elongate coating chamber having first and second opposite ends, said elongate coating chamber including a port communicating with said first end for receiving the elongate object and an outlet at said second end, an air supply passage, a coating material supply passage, and a mixing passage communicating with said air supply passage and said coating material supply passage, said mixing passage further communicating with said elongate coating chamber; anda ring shaped structure communicating between said air supply passage and said mixing passage, said ring shaped structure configured to cause the pressurized air to enter said mixing passage with a swirling motion, said ring shaped structure further including a central passage through which the coating material is directed into said mixing passage and into the air moving with the swirling motion;wherein the pressurized air and coating material in said mixing passage form a mist in said elongate coating chamber moving toward said outlet while coating the exterior of an object inserted into said elongate coating chamber through said port. 12. The device of claim 11, wherein said ring shaped structure further comprises a ring shaped wall surrounding an inner space and disposed around a central axis, and wherein said central passage extends along the central axis, said ring shaped wall further including a plurality of air directing passages communicating between said air supply passage and said inner space and directing the pressurized air into said inner space in the swirling motion around the central axis. 13. The device of claim 12, wherein said ring shaped wall further comprises a plurality of stand-off elements forming additional air passages communicating between said air supply passage and said mixing passage. 14. The device of claim 11, further comprising a coating material injecting element including a tube with an outlet, said tube extending through said central passage with said outlet positioned in said mixing passage. 15. The device of claim 11, further comprising: a valve member and a valve seat mounted in said coating material supply passage, said valve member movable with respect to said valve seat to selectively supply the coating material to the elongate coating chamber. 16. The device of claim 11, wherein said port is configured to allow additional air to be drawn into said elongate coating chamber as the mist is coating the exterior of the elongate object. 17. The device of claim 11, wherein said elongate coating chamber includes a central axis coaxial with said port, and said mixing passage extends transverse to said elongate coating chamber. 18. The device of claim 11, wherein the elongate object further comprises a hollow needle, and further comprising: a needle holder including an interior air space and a needle holding element configured to secure a first end of the needle in communication with the interior air space while an open second end of the needle extends outwardly from said needle holder for insertion through said port and into said elongate coating chamber, wherein said interior air space is adapted to be pressurized with air to force air through the needle and prevent clogging of the open second end of the needle with the coating material. 19. The device of claim 11, wherein said ring shaped structure includes an air passage forming a constriction into said mixing passage thereby causing a Venturi effect of the air entering said mixing passage. 20. The device of claim 11, further comprising: a valve member and a valve seat mounted in said coating material supply passage, said valve member movable with respect to said valve seat to selectively supply the coating material to the elongate coating chamber. 21. The device of claim 20, wherein said housing structure further comprises a first sub-housing and a second sub-housing, said first sub-housing being removably coupled to said second sub-housing and containing said mixing passage, said ring shaped structure and said elongate coating chamber, and said second sub-housing containing said valve member and said valve seat. 22. The device of claim 11, wherein said port is configured to allow additional air to be drawn into said elongate coating chamber as the mist is coating the exterior of the elongate object. 23. A device for coating an exterior of an elongate object, comprising: a housing structure including an elongate coating chamber having first and second opposite ends, a port communicating with said first end for receiving the elongate object into the coating chamber and an outlet at said second end, the housing structure further including an air supply passage and a coating material supply passage communicating with said elongate coating chamber; andan air swirling structure communicating between said air supply passage and said elongate coating chamber, said air swirling structure configured to cause a swirling motion of the pressurized air;wherein pressurized air and coating material are adapted to enter said elongate coating chamber through said air supply passage and said coating material supply passage, respectively, to form a mist of the air and coating material that is directed into said elongate coating chamber and generally toward said outlet while coating the exterior of the elongate object inserted into said elongate coating chamber through said port; and wherein said air swirling structure further includes a central passage through which the coating material is adapted to be directed into the air moving with the swirling motion to thereby form the mist. 24. The device of claim 23, said elongate coating chamber having at least first and second sections, said first section located closer to said outlet than said second section and said first section having a greater cross sectional area than said second section. 25. The device of claim 23, further comprising a mixing passage communicating with said air supply passage and said coating material supply passage, said coating material supply passage extending within said mixing passage and including an outlet in said mixing passage, said mixing passage further communicating with said elongate coating chamber, wherein pressurized air and coating material are adapted to enter said mixing passage through said air supply passage and said coating material supply passage, respectively, to form the mist of the air and coating material that is directed into said elongate coating chamber and generally toward said outlet while coating the exterior of the object inserted into said elongate coating chamber through said port.