Injection moulding of a catheter
First Claim
1. A method for one-piece injection moulding of a soft needle catheter having a hub and a tube-shaped flexible part both formed by said one-piece injection moulding, comprising the steps of:
- feeding a molten polymer into a mould having a core which is used to form an interior of said catheter, the mould and the core together defining a hub cavity to form said hub and a tube-shaped cavity to form said tube-shaped flexible part;
said feeding step including using a core having a cone-shaped part that extends from the hub cavity into the tube-shaped cavity and a cylindrical part extending from a distal end of said cone-shaped part to create within said tube-shaped cavity a tube-shaped flexible part having a cylindrical portion formed distal from said hub and a cone-shaped portion extending between said hub cavity and said cylindrical portion;
removing the core from the catheter when the polymer has been sufficiently cured for the core to be removed; and
removing the one-piece injection moulded soft needle catheter from the mould when the polymer has been sufficiently cured to be removed.
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Accused Products
Abstract
A method for one-piece injection molding of a soft needle catheter having a hub and a tube-shaped flexible part. According to the method, a molten polymer is fed into a mold which includes a core that is used to form the interior of the catheter, the core defining a hub cavity and a tube-shaped cavity. The hub cavity includes a cone-shaped part and a cylindrical part, with the cone-shaped part extending into the tube-shaped cavity. When the polymer is sufficiently cured, the core is removed from the catheter and the catheter is removed from the mold.
58 Citations
21 Claims
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1. A method for one-piece injection moulding of a soft needle catheter having a hub and a tube-shaped flexible part both formed by said one-piece injection moulding, comprising the steps of:
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feeding a molten polymer into a mould having a core which is used to form an interior of said catheter, the mould and the core together defining a hub cavity to form said hub and a tube-shaped cavity to form said tube-shaped flexible part; said feeding step including using a core having a cone-shaped part that extends from the hub cavity into the tube-shaped cavity and a cylindrical part extending from a distal end of said cone-shaped part to create within said tube-shaped cavity a tube-shaped flexible part having a cylindrical portion formed distal from said hub and a cone-shaped portion extending between said hub cavity and said cylindrical portion; removing the core from the catheter when the polymer has been sufficiently cured for the core to be removed; and removing the one-piece injection moulded soft needle catheter from the mould when the polymer has been sufficiently cured to be removed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. The method for one-piece injection moulding of a soft needle catheter having a hub and a tube-shaped flexible part both formed by said one-piece injection moulding, comprising the steps of:
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feeding a molten polymer into a mould having a core which is used to form an interior of said catheter, the mould and the core together defining a hub cavity to form said hub and a tube-shaped cavity to form said tube-shaped flexible part; said feeding step including using a core having a cone-shaped part that extends from the hub cavity into the tube-shaped cavity and a cylindrical part extending from a distal end of said cone-shaped part to a distal tip of said catheter to create within said tube-shaped cavity, in a single moulding step, a tube-shaped flexible part having a cylindrical portion formed distal from said hub and extending to said distal tip and a cone-shaped portion extending between said hub cavity and said cylindrical portion; removing the core from the catheter when the polymer has been sufficiently cured for the core to be removed; and removing the one-piece injection moulded soft needle catheter from the mould when the polymer has been sufficiently cured to be removed. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification