Molded catheter tip
A catheter has extruded length of tubing and an injection molded tip that facilitates insertion of the catheter into the body. The catheter is fabricated by the steps of providing the tubing, for example, by extruding the tubing from a thermoplastic resin cutting the tubing to the desired length, inserting a plug into the tubing, inserting one end of the tubing into an injection mold cavity, creating and forming a tip in an injection molding step, and demolding the tubing with the formed tip.
1. A urinary catheter, comprising:
a urinary catheter shaft having a length of polymer tubing made from a polymer material, the length of polymer tubing having an axial lumen defined therein, the lumen having an inside diameter, the polymer tubing terminating at an end;
a non-porous polymer plug inserted in the lumen a distance sufficient to axially recess the polymer plug from the end of the polymer tubing, at least a portion of the polymer plug having a maximum outside diameter at least as large as the inside diameter of the lumen, the polymer plug having a length wherein the polymer plug is in direct contact with the polymer material of the polymer tubing at least along a portion of the length of the polymer plug; and
a tip attached to an end of the polymer tubing, the tip including a stubshaft that extends into the lumen and is bonded to the polymer plug at a plug-to-tip bond line.
2. The urinary catheter of claim 1 further comprising a hydrophilic coating on an exterior surface of the polymer tubing and tip.
3. The urinary catheter of claim 1 wherein the polymer tubing has an inner wall and an outer wall.
4. The urinary catheter of claim 1 wherein the polymer tubing has an inner wall and an outer wall and further comprising a hydrophilic coating on an exterior surface of the outer wall and tip.
5. The urinary catheter of claim 1 wherein the polymer plug has at least one tapered end.
6. The urinary catheter of claim 1 wherein the tip has an apex at a free end thereof with a depression formed in the apex.
7. The urinary catheter of claim 1 , wherein the plug is a solid material.
8. The urinary catheter of claim 1 , wherein the tip is a solid material.
9. The urinary catheter of claim 1 , wherein the tip is a non-porous material.
10. The urinary catheter of claim 3 , wherein the plug and the inner wall are comprised of the same material.
11. The urinary catheter of claim 3 , wherein the plug, the tip and the outer wall are comprised of the same material.
12. The urinary catheter of claim 3 , wherein the plug and the inner wall are comprised of a similar material.
13. The urinary catheter of claim 3 , wherein the plug, the tip and the outer wall are comprised of a similar material.
14. The urinary catheter of claim 3 , wherein the outer wall is comprised of at least one of the group including polyethylenes, polypropylenes, polyvinylchlorides, polytetrafluoroethylenes, polyvinylacetates, polystyrenes, polyesters, polyurethane, polyamides, ethylene vinyl acetate copolymers, copolymers of ethylene with other comonomers such as acrylic acid, or combinations thereof.
15. The urinary catheter of claim 3 , wherein the outer wall comprises a water swellable polymer.
16. The urinary catheter of claim 3 , wherein the tip comprises a water swellable polymer.
17. The urinary catheter of claim 1 , wherein the tip is integral with the end of the tubing.
18. The urinary catheter of claim 1 , wherein the tip and the end face of the tubing exhibit a strong bond.
19. The urinary catheter of claim 1 , wherein the tip is formed by injection molding.