Method for manufacturing catheter and catheter manufactured by this manufacturing method
A catheter manufacturing method includes positioning a shaft in a cavity of a mold. The shaft is an elongated tubular body configured to be inserted into a living body. The mold includes a first mold die and a second mold die that contact one another to define a closed space which is the cavity. The method includes injecting a molding material into the cavity from a gate at a position between the proximal end and the distal end of the shaft in the axial direction. The injecting position is offset from the center of the shaft in the transverse direction. The method includes molding a hub onto the shaft by solidifying the injected molding material in the cavity onto the outer surface of the shaft.
1. A catheter manufacturing method comprising:
positioning a shaft in a cavity of a mold, the shaft being an elongated tubular body having a lumen formed therein and configured to be inserted into a living body, the mold comprising a first mold die and a second mold die, the first and second mold dies contacting one another to define a closed space which is the cavity between the first and second mold dies, the shaft extending from a proximal end to a distal end in an axial direction and having a transverse direction perpendicular to the axial direction, the shaft possessing an outer surface and a center at a midpoint of the shaft in the transverse direction;
injecting a molding material into the cavity from a gate positioned between the proximal end and the distal end of the shaft in the axial direction, the position being offset from the center of the shaft in the transverse direction; and
molding a hub onto the shaft by solidifying the injected molding material in the cavity onto the outer surface of the shaft.
2. The catheter manufacturing method according to claim 1 , wherein
the mold has a runner directing the molding material to flow from outside the cavity toward the gate, the runner possessing a longitudinal axis, and
the positioning of the shaft in the cavity of the mold such that the axial direction of the shaft has is offset and orthogonal with respect to the longitudinal axis of the runner.
3. The catheter manufacturing method according to claim 2 , wherein
the hub comprises a tubular hub main body and a wing protruding outward from an outer peripheral surface of the hub main body,
the cavity comprises a first space for molding the hub main body and a second space for molding the wing, the second space having a longitudinal axis, and
the shaft is positioned to be parallel to the longitudinal axis of the second space.
4. The catheter manufacturing method according to claim 3 , wherein the longitudinal axis of the runner intersects with the second space such that the molding material is injected directly into the second space.
5. The catheter manufacturing method according to claim 1 , comprising:
the positioning of the shaft in the cavity of the mold being performed by positioning the shaft in a recess of either the first mold die or the second mold die and moving the first and second mold dies relative to one another to clamp the mold to define the closed space, and
pressing the shaft using at least one pin while the mold is clamped.
6. The catheter manufacturing method according to claim 5 , wherein a concave portion is formed in the hub by the pin after the injecting of the molding material and the molding of the hub.
7. The catheter manufacturing method according to claim 5 , wherein the at least one pin is a plurality of the pins that are arranged side by side along the axial direction of the shaft.
8. The catheter manufacturing method according to claim 5 , comprising: withdrawing the pin from the cavity after the molding of the hub onto the shaft; and opening the mold after the withdrawing of the pin from the cavity.