초록 ▼

An implantable positive pressure medication infusion device is provided which is programmable over a wide dynamic range and yet the maximum flow of medication into the body, in the event the inlet valve of the device leaks or fails in the valve open position, is limited to a safe value which is much

An implantable positive pressure medication infusion device is provided which is programmable over a wide dynamic range and yet the maximum flow of medication into the body, in the event the inlet valve of the device leaks or fails in the valve open position, is limited to a safe value which is much lower than the maximum programmable infusion rate of the device. An auxiliary flow restrictor is also provided which bypasses the programmable pumping unit and assures a minimum flow of medication into the body in the event of failure of the programmable pumping unit or its electronic drive. An arrangement is also provided for detecting catheter clogging or failure of the programmable pumping unit in either a positive or negative pressure device.

대표청구항 ▼

In an implantable medication infusion device, the combination of, a medication reservoir having a movable wall portion, a pressure stabilizing chamber in communication with said movable wall portion and filled with a fluid having a pressure which is greater than the pressure of the body in which sai

In an implantable medication infusion device, the combination of, a medication reservoir having a movable wall portion, a pressure stabilizing chamber in communication with said movable wall portion and filled with a fluid having a pressure which is greater than the pressure of the body in which said device is implanted, a solenoid operated pulsatile pumping unit having an inlet communicating with said reservoir through an inlet valve; and a flow restrictor positioned between said pumping unit and a catheter outlet, said flow restrictor permitting; and continuous flow of medication to said catheter outlet at a safe value rate in the event said inlet valve remains open.