Medical Devices & Advanced Therapies for Epilepsy
For some people, seizures continue despite trying anti-seizure medications. When this happens, a neurologist or epilepsy specialist may discuss additional treatment options, including implanted medical devices and advanced therapies.
These options are most often considered for people with drug-resistant epilepsy. They do not work the same way, and they are not right for everyone, but they may help reduce seizure frequency, severity, or recovery time for some individuals.
On This Page
- How treatment devices differ from seizure alert devices
- Overview of VNS, RNS, and DBS
- Who these therapies may be considered for
- Important things to know about each option
- Questions to ask a neurologist or epilepsy specialist
Understanding the Difference
Medical device therapies are designed to help reduce seizures by delivering electrical stimulation to the body or brain. Seizure alert devices are different. They are designed to detect certain seizure-related signs and notify a caregiver or support person. They do not treat seizures.
VNS
Stimulates the vagus nerve in the neck using a small implanted device placed in the chest.
RNS
Monitors brain activity and responds when abnormal electrical activity is detected.
DBS
Provides programmed stimulation to a specific brain target involved in seizure networks.
Seizure Alert Devices
Detect certain seizure-related signs and send alerts. They are not treatment devices.
Overview of Device-Based Treatment Options
These therapies may be discussed when seizures are not well controlled with medication alone. Each option works differently and is considered based on the individual’s epilepsy type, seizure pattern, and medical history.
Vagus Nerve Stimulation
VNS uses a small implanted device to send regular electrical pulses to the left vagus nerve in the neck.
- Implanted in the chest with a lead to the neck
- Usually used together with medication
- May include magnet-activated stimulation
- Some newer systems include heart-rate responsive features
Responsive Neurostimulation
RNS monitors brain activity and delivers stimulation when abnormal electrical patterns are detected.
- Placed in the skull with leads at seizure focus areas
- Responds in real time to detected activity
- Provides brain activity data for the care team
- Designed for certain people with focal drug-resistant epilepsy
Deep Brain Stimulation
DBS delivers electrical stimulation to a specific deep brain target involved in seizure networks.
- Electrodes are placed in the brain
- Stimulation is programmed by a specialist
- Used alongside medication
- May be considered for some people with drug-resistant epilepsy
Vagus Nerve Stimulation (VNS)
Vagus Nerve Stimulation, often called VNS, is one of the best known device-based therapies used in epilepsy care. It involves a small pulse generator implanted under the skin in the chest and a lead connected to the left vagus nerve in the neck. The device sends gentle electrical stimulation at regular intervals throughout the day and night.
When VNS may be considered
- Seizures continue despite anti-seizure medication
- The person is not a candidate for resective epilepsy surgery
- Seizures are affecting quality of life, independence, or safety
- A specialist believes neuromodulation may be appropriate
Potential benefits
- May reduce seizure frequency for some people
- May reduce seizure severity or duration
- May improve recovery time after some seizures
- May improve quality of life for some individuals
Responsive Neurostimulation (RNS)
RNS is a brain-responsive therapy. Unlike VNS, which stimulates on a scheduled basis through the vagus nerve, RNS monitors brain activity directly and responds when it detects abnormal patterns that may lead to a seizure.
Who it may be considered for
- People with focal drug-resistant epilepsy
- People whose seizures begin in one or two identified areas
- People who are not good candidates for other surgical options
Important considerations
- Requires brain surgery
- Not appropriate for every type of epilepsy
- Used together with medication
- Requires ongoing specialist follow-up
Deep Brain Stimulation (DBS)
DBS is another neuromodulation option used in epilepsy care. It involves placing electrodes in a specific deep brain target associated with seizure pathways. A device implanted in the chest sends programmed stimulation to that target.
How DBS differs
- Like RNS, DBS involves electrodes placed in the brain
- Unlike RNS, DBS generally provides programmed stimulation rather than responsive stimulation
- Unlike VNS, DBS does not stimulate the vagus nerve in the neck
Important considerations
- Requires surgery
- Programming and follow-up are needed over time
- Medication is still usually part of treatment
- Benefits vary from person to person
Seizure Alert Devices
Seizure alert devices do not treat seizures. Instead, they may detect certain seizure-related signs such as repetitive movements, heart-rate changes, or nighttime patterns and send an alert to a caregiver or loved one.
Why this is separate
- These tools are designed for monitoring or alerting
- They do not deliver treatment stimulation
- They may support safety planning, especially for some seizure types
- They are different from VNS, RNS, and DBS
Who These Therapies May Be Considered For
Advanced therapies are typically discussed when seizures continue to affect safety, quality of life, or independence despite treatment with medication.
When Medication Is Not Enough
These options may be considered when seizures continue even after trying anti-seizure medications.
When Surgery Is Not the Right Fit
Some people may not be candidates for resective epilepsy surgery, or another approach may be considered more appropriate.
When Seizures Still Affect Daily Life
These therapies may be explored when seizures continue to affect safety, recovery, participation, independence, or overall quality of life.
Comparing Treatment Devices and Alert Devices
Each option serves a different purpose. This chart can help make the differences easier to understand.
| Option | Main Purpose | Where It Works | Main Difference |
|---|---|---|---|
| VNS | Sends regular stimulation through the vagus nerve | Vagus nerve in the neck | Does not require electrodes placed in the brain |
| RNS | Monitors brain activity and responds when abnormal activity is detected | Inside the skull with leads at seizure focus areas | Responsive rather than scheduled stimulation |
| DBS | Provides programmed stimulation to a specific brain target | Deep brain target | Involves electrodes placed in the brain |
| Seizure Alert Devices | Detect certain seizure-related signs and send alerts | Wearable, bedside, or external device | Do not treat seizures |
Questions to Ask a Neurologist or Epilepsy Specialist
If you are exploring medical device options, these questions may help guide the conversation.
About Fit
Is this therapy appropriate for my type of epilepsy? Why are you recommending this option? Am I a candidate for surgery, neuromodulation, or both?
About Benefits
What improvement might be realistic for me? Will this help reduce frequency, severity, or recovery time? How long might it take before we know if it is helping?
About Safety
What are the risks of surgery? What side effects are common? How could MRI access or future procedures be affected?
About Follow-Up
How often would appointments be needed? Will settings be adjusted over time? What should I expect long term?