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A medical device, such as a catheter shaft, having an inner lumen defined by a layer of polymer coating, and a method for forming such a medical device. In some embodiments, the method generally includes the steps of applying a polymer coating to an elongated mandrel, and constructing the remainder

A medical device, such as a catheter shaft, having an inner lumen defined by a layer of polymer coating, and a method for forming such a medical device. In some embodiments, the method generally includes the steps of applying a polymer coating to an elongated mandrel, and constructing the remainder of the catheter shaft body around the polymer coated mandrel. In some embodiments, the polymer coating layer is made from water dispersible polymer or water soluble polymer.

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What is claimed is: 1. A method for forming a medical device comprising: providing an elongated mandrel; providing an aqueous coating solution including water and a water soluble polymer dissolved in the water wherein the water soluble polymer comprises polyvinyl alcohol, polyethyleneoxide, polyeth

What is claimed is: 1. A method for forming a medical device comprising: providing an elongated mandrel; providing an aqueous coating solution including water and a water soluble polymer dissolved in the water wherein the water soluble polymer comprises polyvinyl alcohol, polyethyleneoxide, polyethyleneglycol, polyvinylpyrrolidone, carboxymethylcellulose, hydroxyethylcellulose, or mixtures thereof; applying the aqueous coating solution to the elongated mandrel to define a polymer coating layer on the mandrel, wherein the polymer coating layer is a generally continuous layer of the water soluble polymer, and wherein the generally continuous polymer coating layer comprises the water soluble polymer that is water soluble or water dispersible prior to curing, and is not water soluble after curing; disposing at least one additional layer around a portion of the polymer coating layer, wherein the one additional layer includes a reinforcing layer; and removing the elongated mandrel to expose an inner lumen at least partially defined by the polymer coating layer. 2. The method of claim 1, wherein the polymer coating layer comprises polytetrafluroethylene, polytetrafluoroehylene, polyacrylic acid, or mixtures thereof. 3. The method of claim 1, wherein after the applying step, the polymer coating layer is cured. 4. The method of claim 1, wherein after the applying step, the polymer coating layer is heat treated. 5. The method of claim 1, wherein the aqueous coating solution is applied to the elongated mandrel through dip coating. 6. The method of claim 1, wherein the aqueous coating solution is applied to the elongated mandrel through extrusion. 7. The method of claim 1, wherein the polymer coating layer has a thickness in the range of about 0.0005 and about 0.005 of an inch. 8. The method of claim 1, wherein the polymer coating layer has a thickness in the range of about 0.001 and about 0.003 of an inch. 9. The method of claim 1, a wherein the reinforcing layer comprises one or more elongated filaments. 10. The method of claim 1, wherein the reinforcing layer includes a braid. 11. The method of claim 1, wherein the reinforcing layer includes a coil. 12. A method for forming a catheter shalt having a polymer coated inner lumen, the method comprising: providing an aqueous coating solution including water and a water soluble polymer dissolved in the water wherein the water soluble polymer comprises polyvinyl alcohol, polyethyleneoxide, polyethyleneglycol, polyvinylpyrrolidone, carboxymethylcellulose, hydroxyethylcellulose, or mixtures thereof; applying the aqueous coating solution to an elongated mandrel to define a polymer coating, wherein the polymer coating is a generally continuous layer of the water soluble polymer; disposing a reinforcement material around the mandrel and onto the polymer coating; disposing at least one outer member over the reinforcement material and polymer coating; and removing the mandrel from the polymer material to expose the polymer coated inner lumen. 13. A method for fanning a catheter shaft having a polymer coated inner lumen, the method comprising: providing an aqueous fluid comprising a water soluble polymer composition dissolved in water, wherein the polymer composition consists essentially of polyvinyl alcohol, polyethyleneoxide, polyethyleneglycol, polyvinylpyrrolidone, carboxymethylcellulose, hydroxyethylcellulose, or mixtures thereof, and wherein the water soluble polymer composition is the sole polymer component within the aqueous fluid; applying the aqueous fluid to an elongated mandrel to define a polymer coating; disposing a reinforcement material around the mandrel and onto the polymer coating; disposing at least one outer member over the reinforcement material and polymer coating; and removing the mandrel from the polymer material to expose the polymer coated inner lumen. 14. The method of claim 1, wherein the coating solution further includes one or more additives or modifiers. 15. The method of claim 13, wherein the aqueous fluid further includes one or more additives or modifiers. 16. The method of claim 12, wherein the coating solution further includes one or more additives or modifiers.