Patent ID: 8444609

Claim:
A liquid therapeutic substance delivery system comprising: an implantable medical device for delivering a liquid therapeutic substance to a delivery site within a patient, the delivery device including: a housing defining a catheter outlet; a reservoir maintained by the housing for containing the therapeutic substance, the reservoir forming a reservoir outlet; a reservoir fill port fluidly connected to the reservoir; a catheter access port apart from the reservoir fill port and including a needle inlet defining a passage, a well fluidly coupled to the catheter outlet via a fluid pathway, and a septum disposed between the well and the needle inlet; and a denial device associated with the catheter access port and including: a pin arranged to be movable between a first position in which the pin blocks passage of a needle into the well and a second position in which the pin does not prevent passage of a needle into the well, a biasing element biasing the pin to the first position, a solenoid operatively coupled to the pin and providing an energized state and a de-energized state, the solenoid being adapted and arranged such that in the energized state, the solenoid operates to move the pin from the first position to the second position, wherein the well is not fluidly sealed relative to an exterior of the medical device by the pin in the first position.