The type of system you are using is called an intrathecal (IT). Intrathecal means within the spinal canal. The spinal canal is the opening for the spinal cord to travel from the brain down to the bottom of the spine. Delivering pain medication through the spinal canal directly into the spinal fluid is a fast and effective way to override pain messages to the brain.
This type of pain control is done with a pump that can be implanted (placed) inside the body. The pump is usually placed in the abdomen with a catheter (tube) up into the spinal canal. When placed internally, the intrathecal pump provides a constant stream of pain relieving medications into the spinal fluid. Various medications can be used. They all have advantages and disadvantages. Opioids (narcotics) are commonly tried first.
There are several types of intrathecal drug delivery systems. Some are totally implanted inside the body. Others have an external pump. The internal pumps are often placed in the abdomen. They have a catheter tube that goes into the spinal canal to deliver the drug.
Some units don’t have an actual pump. Instead, they have a catheter that goes from just under the skin to the spinal canal. A tiny opening under the skin (called the port) makes it possible to shoot an injection of medication from the outside into the catheter.
Newer pump models have programmable options for amount of drug delivered allowing preset times to be determined. Others make it possible to self-administer (the patient controls when and how much drug is delivered). Newer pumps have improved life — they are more durable and last longer. Some make it possible to use two different drugs administered without mixing them together.
It’s best to talk this over with your prescribing physician and/or the team members who are helping you manage your pain. Selection of devices depends on cost, features needed by the patient, drug doses and flow required for optimal pain control, and availability.