Introducer sheath assembly with hub
A tearaway introducer sheath assembly ( 10 ) for use in implantation of a catheter into a patient, having an elongated polytetrafluoroethylene sheath tube ( 12 ) and a proximal polyethylene hub component ( 16 ). The hub comprises two halves ( 22 ) insert molded about the sheath tube proximal end and joined to each other by frangible webs ( 28 ) enabling manual splitting. At least one pair of opposed holes ( 42 ) is formed through the tube proximal end portion 44 , and a polyethylene liner ( 46 ) is inserted into the tube's proximal end portion. The polyethylene flows into the at least one pair of holes ( 42 ) to fuse with the liner, establishing a pair of physical joints ( 50 ′) integrally joining the liner ( 46 ) to a respective hub half ( 22 ). Upon manual splitting of the hub halves, the sheath tube easily splits along its length as a result of a property of the polytetrafluoroethylene material.
1. An introducer sheath assembly, comprising:
an elongated sheath tube having a distal end and a proximal end and a longitudinal passageway extending therethrough, the sheath tube proximal end having at least one pair of opposed holes therethrough;
a hub affixed to and extending about at least a portion of an external surface of the proximal end of the sheath tube; and
an interior lining portion extending along an inside surface of the sheath tube proximal end,
wherein joints integrally join the hub to the interior lining portion through the at least one pair of opposed holes through the sheath tube adjacent the sheath tube proximal end thereby joining the hub to the elongated sheath tube.
2. The assembly of claim 1 , wherein the interior lining portion has an inner diameter generally equal to a diameter of the sheath tube passageway and the diameter of the sheath tube proximal end is expanded for the interior lining portion to be disposed therewithin.
3. The assembly of claim 1 , wherein the hub and the interior lining portion are adapted to be manually split apart into associated halves after insertion of a catheter through the introducer sheath, and the elongated sheath tube is adapted to be split upon splitting of the hub and interior lining portion, and respective ones of the at least one pair of opposed joints are joined to respective ones of the hub/lining portion halves.
4. The assembly of claim 3 , wherein the elongated sheath tube is formed of a first material, and the hub is formed of a second material different from the first material.
5. The assembly of claim 4 , wherein the interior lining portion is a liner preformed of a material at least sufficiently compatible with the second material to form an integral joint therewith during molding of the hub to the elongated sheath tube proximal end.
6. The assembly of claim 5 , wherein the liner includes a proximal liner portion projecting proximally from the proximal end of the sheath tube after insertion into the enlarged proximal sheath tube end portion, for eventual bonding with the hub upon molding.
7. The assembly of claim 5 , wherein the liner includes score lines extending along opposite sides thereof to facilitate the initiation of splitting thereof for eventual sheath removal.
8. The assembly of claim 5 , wherein the liner includes notches extending distally from the proximal end thereof to facilitate the initiation of splitting thereof for eventual sheath removal.
9. The assembly of claim 5 , wherein the liner is formed of the second material.
10. The assembly of claim 9 , wherein the sheath tube is formed of polytetrafluoroethylene and the hub and liner are formed of polyethylene.
11. The assembly of claim 5 , wherein the sheath tube is formed of polytetrafluoroethylene and the hub is formed of polyethylene.
12. The assembly of claim 5 , wherein the sheath tube at least includes notches on opposed sides of the proximal end of the proximal portion and further includes proximal projections from the proximal end angularly spaced about 90° from the notch locations, and wherein the liner includes corresponding proximal projections extending from the proximal end thereof similarly angularly spaced about 90° from score lines extending therealong on opposed sides, facilitating appropriate angular orientation between the sheath tube and the liner during molding of the hub component thereto, all to facilitate eventual splitting of the introducer assembly.
13. The assembly of claim 1 , wherein the sheath tube proximal end has at least two pairs of opposed holes therethrough, resulting in at least two pairs of opposed joints.
14. A tearaway introducer sheath assembly, comprising:
an elongated sheath tube having a distal end and a proximal end and a longitudinal passageway extending therethrough, the sheath tube proximal end having at least one pair of opposed holes therethrough;
a hub affixed to and extending about at least a portion of an external surface of the proximal end of the sheath tube; and
an interior lining portion extending along an inside surface of the sheath tube proximal end,
wherein at least one pair of opposed joints integrally join the hub to the interior lining portion through the at least one pair of opposed holes through the sheath tube adjacent the sheath tube proximal end thereby joining the hub to the elongated sheath tube, and
wherein the hub and the interior lining portion are adapted to be manually split apart into associated halves after insertion of a catheter through the introducer sheath, and the elongated sheath tube is adapted to be split upon splitting of the hub and interior lining portion, and respective ones of the at least one pair of opposed joints are joined to respective ones of the hub/lining portion halves.
15. The assembly of claim 14 , wherein the elongated sheath tube is formed of a first material, and the hub is formed of a second material different from the first material, and wherein the interior lining portion is a liner preformed of a material at least sufficiently compatible with the second material to form an integral joint therewith during molding of the hub to the elongated sheath tube proximal end.
16. The assembly of claim 15 , wherein the sheath tube is formed of polytetrafluoroethylene.
17. The assembly of claim 15 , wherein the sheath tube at least includes notches on opposed sides of the proximal end of the proximal portion and further includes proximal projections from the proximal end angularly spaced about 90° from the notch locations, and wherein the liner includes corresponding proximal projections extending from the proximal end thereof similarly angularly spaced about 90° from score lines extending therealong on opposed sides, facilitating appropriate angular orientation between the sheath tube and the liner during molding of the hub component thereto, all to facilitate eventual splitting of the introducer assembly.
18. The assembly of claim 14 , wherein the liner includes a proximal liner portion projecting proximally from the proximal end of the sheath tube after insertion into the enlarged proximal sheath tube end portion, for eventual bonding with the hub upon molding.
19. The assembly of claim 18 , wherein the liner is formed of the second material.
20. The assembly of claim 19 , wherein the sheath tube is formed of polytetrafluoroethylene and the hub and liner are formed of polyethylene.
21. The assembly of claim 14 , wherein the liner includes score lines extending along opposite sides thereof to facilitate the initiation of splitting thereof for eventual sheath removal.
22. The assembly of claim 14 , wherein the liner includes notches extending distally from the proximal end thereof to facilitate the initiation of splitting thereof for eventual sheath removal.
23. The assembly of claim 14 , wherein the sheath tube proximal end has at least two pairs of opposed holes therethrough, resulting in at least two pairs of opposed joints.