It is not uncommon to have epidural or spinal pain pump with marcaine, dilaudid , mophine and clonidine or the combination of it.
A short paragraph copied below for your info about the procedure.
"Anesthesiologists, neurosurgeons, and other doctors who specialize in spine disorders implant the pump. Surgery is performed as an outpatient. It is a two-part process and usually takes three to four hours. You will have anesthesia during the procedure. Most patients are discharged to home the same day as the procedure.
The catheter or small plastic tubing is inserted into the intrathecal space through a small incision near the spine and secured there. Careful placement of the catheter is important as the medication is only beneficial if placed in the area surrounding the spinal cord, the intrathecal space. Once the catheter is in place, an extension catheter is threaded under the skin around to your abdomen where the pump will be implanted.
Next your surgeon makes a four to six inch incision in the side of your abdomen, below the waistline. The pump is then inserted between the skin and muscle layers. The catheter is then attached to the pump. Medication is then allowed to flow from the device through the tubing.
Positioning of the catheter is checked with fluoroscopy. Fluoroscopy is an imaging technique using a continuous X-ray beam that is passed through the body part being examined. You are placed between the X-ray beam and a fluorescent screen. The image is transmitted to a TV-like monitor so that live video images can be played. This allows the physician to watch the procedure he/she is performing to ensure proper placement of the catheter. It also allows them to check and make sure the medication from the pump is delivered correctly."
A much detailed and longer version for you in the following link.if you do not mind the graphics.
Please know that my personal opinion is not intended nor implied to be a substitute for professional medical advice. If provided, information are for educational purposes.Consult doctor is a MUST for changing of treatment plans.