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Infusion pumps designed for use in the administration of analgesics that are intended for implantation. These pumps are frequently battery-powered devices that use a syringe-driven mechanism, an infusion rate controller, and an internal reservoir containing the analgesic solution. The solution is delivered from the implanted pump to a subcutaneous catheter with a needle at the distal end that is typically inserted in the desired position. The pump must be able to deliver a continuous or intermittent flow and/or deliver bolus doses of analgesics when necessary. Implantable analgesic infusion pumps are used mainly to treat otherwise intractable chronic pain; dedicated implantable pumps designed to deliver medication to the space that contains the spinal fluid (i.e., the intrathecal space) are also available.
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