| 主权项 |
1. A catheter hub apparatus comprising:
a. a distal hub member coupled to a proximal end of a catheter sheath comprising
i. a body member having an inside surface defining a longitudinal lumen, andii. a proximal hub attachment member comprising a proximally-extending arm and a resilient projection; b. a proximal hub member fixedly coupled to a proximal end of a catheter comprising
i. an outer wall defining an internal cavity and having an open distal end,ii. a central mounting section comprising a distally-extending annular wall defining a longitudinal lumen, an annular shelf, and an opening at a proximal end of the proximal hub member, andiii. a catch opening formed in the outer wall of the proximal hub member; c. a core member disposed in the central mounting section of the proximal hub member, the core member comprising
i. a wall defining a longitudinal lumen,ii. a flange at a proximal end of the core member,iii. an annular detent, andiv. an annular recess; d. a sealing member attached to the inside surface of the body member of the distal hub member, the sealing member comprising a wall defining a longitudinal lumen of the sealing member, the longitudinal lumen of the sealing member having a diameter greater than an outside diameter of the core member; e. a hemostasis valve interfacing with the inside surface of the body member of the distal hub member and an annular shelf on a distal end of the sealing member; and f. an o-ring seated within the annular recess of the core member; g. wherein the catheter fixedly coupled to the proximal hub member is disposed within the catheter sheath coupled to the distal hub member, the resilient projection is configured to engage with and at least partially pass through the catch opening to removably couple the distal hub member and the proximal hub member, the catheter is longitudinally movable within the sheath until the distal hub member is removably coupled to the proximal hub member, and the distal hub member disengages from the proximal hub member by disengaging the resilient projection from the catch opening and to longitudinally move the catheter and proximal hub member proximally away from the distal hub member, the hemostasis valve forms a fluid barrier preventing proximal fluid flow between a distal end of the longitudinal lumen of the distal hub member and the annular shelf on the distal end of the sealing member, and the o-ring forms a fluid barrier between a distal end of the longitudinal lumen of the sealing member and the internal cavity of the proximal hub member; the distal hub member further includes a side port in fluid communication with the longitudinal lumen of the distal hub member; and the wall of the core member comprises a first annular taper formed at the distal end of the core member and a second annular taper intermediate the annular recess and the flange at a proximal end of the core member; the longitudinal lumen of the sealing member includes a narrow distal section, a wide proximal section, a tapering intermediate section, and a tapering proximal section; the first annular taper of the core member interfaces with the tapering proximal section of the sealing member, such that the o-ring interfaces with the surface of the longitudinal lumen of the sealing member and creates the fluid barrier between the longitudinal lumen of the sealing member and the first annular taper of the core member; the sealing member is attached to the inside surface of the distal hub member by press fit or adhesives. |
