Patent ID: 6013058
Filing Date: 2000-01-11
Classification: A61M,Y10S

Abstract:
In an access device for subcutaneous access for transfer of fluid into and/or out of a human or animal body and defining an internal passage therein and having a device entrance for access at one end by a cannula passing through the skin and at the other end by an implanted conduit such as a catheter, the improvement therein comprising:(a) locking structure within the device adjacent the internal passage and any cannula therein and restrained within the device,(b) means defining a shell structure surrounding the locking structure and having an internal surface adjacent to the locking structure,(c) means defining at least one essentially rigid blade within the shell spanning the gap between the surface of a cannula inserted in the passage and said internal shell surface, and(d) said internal shell surface being tapered toward the device entrance so that the beginning of inadvertent cannula withdrawal motion produces an increase in locking force against the at least one blade that in turn restrains cannula axial movement,the foregoing structure being constructed and arranged so that twisting the cannula pushes each blade from its locking alignment to an unlocking alignment to allow easy cannula withdrawal.