Test without limits

Choose between two types of evaluations

Evaluations allow patients to try InterStim™ therapy to assess its efficacy so they can make an educated decision with their physician about whether to proceed with implantation. In general, the evaluation is successful if the patient experiences a significant (50% or greater) reduction in symptoms.

Basic evaluation

The basic evaluation (also referred to as peripheral nerve evaluation or PNE) is typically used to evaluate patients with bladder control and bowel control problems. It is initiated through a simple procedure, during which the lead is placed in the upper buttock.

This lead connects to an external neurostimulator (ENS) that the patient wears on a belt. For up to 7 days (depending on physician guidance), the patient completes a symptom diary that is eventually compared to a baseline (established by using a symptom diary prior to the evaluation).¹

Advanced evaluation

The advanced evaluation (also referred to as Stage 1) is initiated through an outpatient procedure performed in a hospital or surgical center.

The patient also wears an ENS during the advanced evaluation, which lasts up to 14 days (depending on physician guidance). Symptom diaries are used to measure results.

Complications can occur with the evaluation, including movement of the wire, technical problems with the device, and some temporary pain. Patients should be instructed on operating the test device and given other precautions related to the evaluation as well as activity restrictions.