If you’re considering sacral neuromodulation for overactive bladder, urinary retention, or fecal incontinence, you’ve likely encountered two names: Axonics and InterStim. Both systems offer life-changing treatment for patients who haven’t found relief with traditional approaches, but understanding the differences between these technologies is crucial for making the best decision for your long-term health and quality of life.
As we move through 2026, the landscape of sacral neuromodulation continues to evolve, with significant technological advances making treatment more effective, convenient, and comfortable than ever before. At Bladder Center Phoenix, we’ve had extensive experience with both systems, and we’re here to provide you with an honest, comprehensive comparison to help guide your decision.
Understanding Sacral Neuromodulation: The Foundation
What Is Sacral Neuromodulation?
Before diving into the comparison between Axonics and InterStim, it’s important to understand what sacral neuromodulation is and why it’s become the gold standard treatment for many bladder and bowel conditions.
Sacral neuromodulation is a minimally invasive treatment that uses gentle electrical stimulation to restore normal communication between the bladder, bowel, and brain. The therapy works by modulating nerve signals in the sacral region (near the base of the spine) that control pelvic organ function.
Think of it as a pacemaker for your pelvic organs. Just as a cardiac pacemaker helps regulate heart rhythm, a sacral neuromodulator helps regulate bladder and bowel function by delivering precisely calibrated electrical pulses to the relevant nerves.
Who Benefits from Sacral Neuromodulation?
Sacral neuromodulation has proven highly effective for treating:
- Overactive Bladder (OAB): Including urgency, frequency, and urgency incontinence
- Urinary Retention: Difficulty emptying the bladder completely
- [Fecal Incontinence](/fecal-incontinence): Loss of bowel control
- Chronic Pelvic Pain: In some cases, particularly when related to pelvic floor dysfunction
The treatment is particularly valuable for patients who haven’t achieved adequate relief from conservative treatments like medications, behavioral modifications, or less invasive procedures.
The Evolution of Sacral Neuromodulation Technology
A Brief History
Sacral neuromodulation has been available for over two decades, with InterStim being the pioneer in this field. Medtronic’s InterStim system received FDA approval in 1997 for urinary symptoms and later for fecal incontinence, establishing sacral neuromodulation as a viable treatment option for millions of patients.
However, as with any medical technology, the first-generation systems had limitations that affected patient experience and long-term outcomes. These included:
- Relatively large device size
- Limited battery life requiring frequent surgical replacements
- MRI restrictions that could complicate future medical care
- Programming limitations that made optimization challenging
The Next Generation: Axonics
Recognizing the potential for improvement in sacral neuromodulation technology, Axonics developed a next-generation system that addresses many of the limitations of earlier devices. The Axonics system received FDA approval in 2019 and has quickly gained recognition for its technological advances and improved patient experience.
The development of Axonics represents more than just incremental improvement—it’s a fundamental rethinking of how sacral neuromodulation devices should be designed to meet patient needs in the 21st century.
Comprehensive Axonics vs InterStim Comparison
Device Size and Patient Comfort
Axonics Advantage: Significantly Smaller Profile
One of the most immediately noticeable differences between Axonics and InterStim is device size. The Axonics neurostimulator is substantially smaller than the InterStim device:
- Axonics: Approximately 5cc in volume (about the size of a stopwatch)
- InterStim: Approximately 16cc in volume (significantly larger and thicker)
What This Means for Patients:
The smaller size of the Axonics device translates to several real-world benefits:
- Improved Comfort: The device is less noticeable under the skin and causes less discomfort during daily activities
- Better Cosmetic Result: Smaller profile means less visible bulging under the skin
- Easier Implantation: Smaller surgical pocket required, potentially leading to easier recovery
- Reduced Skin Complications: Less risk of skin-related issues over the device site
- Enhanced Body Image: Many patients report feeling more confident about the appearance of their implant site
Patient Experience: Sarah, a 52-year-old Phoenix resident, explains: “I was initially concerned about having a visible bulge under my skin. With the Axonics device, I honestly forget it’s there most of the time. Even my husband can barely tell where it is unless I point it out.”
Battery Life: The Game-Changing Difference
Axonics Revolutionary Advantage: 15+ Year Battery Life
Perhaps the most significant difference between the two systems is battery longevity:
- Axonics: 15+ years of battery life
- InterStim: Typically 5-7 years, with some patients needing replacement sooner
The Impact of Battery Life:
This difference in battery longevity has profound implications for patients:
Fewer Surgeries: With Axonics, most patients will never need a battery replacement surgery during their lifetime. InterStim patients typically require 2-3 replacement surgeries over a 15-20 year period.
Reduced Long-term Costs: While both systems may have similar initial costs, the long-term expenses associated with multiple replacement surgeries make Axonics more cost-effective over time.
Less Anxiety: Many InterStim patients report anxiety as their battery replacement surgery approaches. Axonics patients can enjoy peace of mind knowing they likely won’t face this concern.
Simplified Life Planning: With 15+ years of battery life, patients don’t need to plan their lives around upcoming surgeries or worry about device replacement timing.
Lower Risk Profile: Fewer surgeries mean fewer opportunities for complications, infections, or other surgical risks.
Patient Perspective: Michael, a 47-year-old Phoenix businessman, shares: “When I learned I might need surgery every 5-7 years with InterStim, I hesitated. The idea of multiple surgeries over my lifetime was concerning. The 15+ year battery life of Axonics made the decision easy—it’s essentially a one-time procedure for me.”
MRI Compatibility: Future-Proofing Your Healthcare
Axonics Clear Advantage: Full-Body MRI Compatibility
MRI compatibility represents another crucial difference between the systems:
- Axonics: Conditionally approved for full-body MRI scans at 1.5T and 3T
- InterStim: Limited MRI compatibility with restrictions on body regions and imaging parameters
Why MRI Compatibility Matters:
As we age, the likelihood of needing MRI scans increases significantly. MRI is the gold standard for diagnosing numerous conditions including:
- Stroke and neurological conditions
- Joint and spine problems
- Cancer detection and monitoring
- Cardiac conditions
- Abdominal issues
The InterStim Limitation: Patients with traditional InterStim devices often face difficult decisions when MRI scans are medically necessary. Options may include:
- Limiting scan parameters, potentially reducing diagnostic quality
- Undergoing device removal and replacement surgery
- Accepting alternative, potentially less effective imaging methods
The Axonics Solution: Patients with Axonics devices can receive medically necessary MRI scans throughout their lifetime without device removal or replacement. While specific protocols must be followed, the capability is there when needed.
Real-World Impact: Dr. Martinez, a Phoenix radiologist, notes: “I’ve seen patients with older neuromodulation devices struggle to get appropriate imaging when they need it. The full-body MRI compatibility of Axonics eliminates a significant barrier to comprehensive medical care.”
Charging and Power Management
Axonics: Modern Wireless Charging
- Charging Method: Wireless charging through the skin using an external charging pad
- Charging Frequency: Approximately 1 hour every few weeks
- Convenience: Can charge while reading, watching TV, or relaxing
- Flexibility: Charging can be done at home, work, or while traveling
InterStim: Non-Rechargeable Battery
- Power Source: Fixed battery that cannot be recharged
- Battery Management: No maintenance required until replacement surgery needed
- Predictability: Battery life gradually decreases over time
Patient Convenience Comparison:
While InterStim’s non-rechargeable design means no ongoing maintenance, the trade-off is much more frequent surgical procedures. Most patients find that the minimal charging requirement of Axonics is far preferable to repeated surgeries.
Patient Experience: Lisa, a 61-year-old retiree, explains: “I was initially concerned about having to charge a device, but it’s become part of my routine. I charge it while I read before bed a few times a month. It’s so much better than thinking about surgery every few years.”
Programming and Control Options
Axonics: Advanced Digital Control
- Patient Control: Smartphone app allows discreet therapy adjustments
- Programming Flexibility: Multiple program options can be stored and switched between
- Real-time Adjustments: Patients can optimize therapy for different activities or times of day
- Data Tracking: App can track therapy usage and symptom patterns
InterStim: Traditional Programming Approach
- Patient Control: Handheld programmer for basic adjustments
- Programming Options: More limited programming flexibility
- Clinical Programming: Most adjustments require clinic visits
- Established Protocols: Well-established programming approaches based on decades of experience
The Modern Advantage: While InterStim’s established programming protocols are effective, Axonics’ modern approach offers more personalization and patient control. The smartphone app integration reflects contemporary expectations for medical device management.
Clinical Effectiveness and Patient Outcomes
Success Rates: Both Systems Deliver Results
It’s important to note that both Axonics and InterStim have demonstrated excellent clinical effectiveness:
Axonics Clinical Results:
- Up to 95% patient satisfaction in clinical studies
- Significant reduction in overactive bladder symptoms
- High rates of symptom resolution for urinary retention
- Excellent outcomes for fecal incontinence treatment
InterStim Track Record:
- Over two decades of proven clinical success
- Extensive real-world data from hundreds of thousands of patients
- Well-documented long-term effectiveness
- Established treatment protocols for various conditions
The Clinical Reality: Both systems are highly effective for appropriate candidates. The choice often comes down to patient preferences regarding device features, battery life, and long-term considerations rather than clinical effectiveness.
Comparative Studies: Recent studies directly comparing Axonics and InterStim have shown similar effectiveness for symptom improvement, with patient preference often favoring Axonics due to the technological advantages mentioned above.
Surgical Considerations
Implantation Procedure Similarities:
Both Axonics and InterStim use similar surgical techniques:
- Outpatient procedure performed under light sedation
- Test stimulation period to confirm appropriate placement
- Similar recovery times and post-operative care requirements
- Comparable risks associated with the implantation procedure
Axonics Surgical Advantages:
- Smaller surgical pocket required due to device size
- Potentially faster procedure due to simplified implantation
- Less tissue dissection required for device placement
InterStim Surgical Considerations:
- Well-established surgical techniques with decades of refinement
- Extensive surgeon experience and training programs available
- Proven track record of successful implantations
Surgeon Perspective: Dr. Johnson, a Phoenix urologist experienced with both systems, notes: “Both procedures are straightforward, but the smaller Axonics device does make implantation somewhat easier and often results in less post-operative discomfort for patients.”
Patient Selection: Who Benefits from Each System?
Ideal Candidates for Both Systems
Both Axonics and InterStim are appropriate for patients who:
- Have failed conservative treatments for bladder or bowel dysfunction
- Experience moderate to severe symptoms that impact quality of life
- Are willing to undergo minor surgery for long-term symptom improvement
- Have realistic expectations about treatment outcomes
- Can commit to appropriate follow-up care
When Axonics May Be Preferred
Axonics may be the better choice for patients who:
- Are younger and want to minimize lifetime surgeries
- Prioritize device discretion and comfort
- May need future MRI scans for other health conditions
- Appreciate modern technology features like smartphone app control
- Are concerned about long-term treatment costs
- Want the latest technology available
When InterStim Might Be Considered
InterStim may be appropriate for patients who:
- Prefer a well-established system with extensive long-term data
- Don’t want to manage device charging
- Have specific anatomical considerations that favor the InterStim approach
- Are working with a surgeon who has extensive InterStim experience but limited Axonics experience
Important Note: The choice between systems should be made in consultation with an experienced physician who can evaluate your specific situation and needs.
Real Patient Experiences: Axonics vs InterStim
Jennifer’s Journey: Choosing Axonics
Jennifer, a 44-year-old Phoenix teacher, spent months researching both options before choosing Axonics:
“As a teacher, I’m on my feet all day and needed something that wouldn’t be noticeable or uncomfortable. The smaller size of Axonics was appealing, but what really sold me was the battery life. I’m relatively young and didn’t want to plan my career around surgery every five to seven years. The 15+ year battery life means I can focus on my students and my life, not on medical procedures.”
Six months after implantation, Jennifer reports:
- Complete resolution of urgency incontinence episodes
- Reduction in daily bathroom trips from 15+ to 6-7
- Return to full teaching activities without anxiety about bathroom access
- High satisfaction with the smartphone app for discreet therapy adjustments
Robert’s Choice: InterStim Experience
Robert, a 68-year-old Phoenix retiree, chose InterStim based on his physician’s extensive experience with the system:
“My urologist had been doing InterStim procedures for over 15 years and had excellent results. At my age, the battery replacement surgery in 5-7 years didn’t seem as concerning, and I appreciated having a system with such a long track record.”
Robert’s outcome has been excellent:
- Significant improvement in urinary retention symptoms
- Ability to empty bladder completely for the first time in years
- Elimination of intermittent catheter use
- High satisfaction with symptom improvement
The Key Insight: Both patients achieved excellent results with their chosen systems. The decision often comes down to individual priorities, age considerations, and physician expertise.
Cost Considerations: Upfront vs. Long-term
Initial Costs
The initial costs for both Axonics and InterStim procedures are generally comparable:
- Device costs are similar
- Surgical fees are comparable
- Insurance coverage is typically equivalent for both systems
Long-term Cost Analysis
The total cost of ownership differs significantly due to battery life differences:
Axonics Long-term Costs:
- Initial implantation procedure
- Routine follow-up care
- Minimal ongoing costs for 15+ years
- Potential device replacement after 15+ years (may not be needed in many patients’ lifetimes)
InterStim Long-term Costs:
- Initial implantation procedure
- Battery replacement surgery every 5-7 years
- Multiple replacement procedures over a patient’s lifetime
- Associated surgical risks and recovery time with each replacement
Financial Impact: For a 50-year-old patient, choosing Axonics over InterStim could potentially save tens of thousands of dollars over their lifetime by eliminating 2-3 replacement surgeries.
Insurance Considerations: Most insurance plans that cover sacral neuromodulation will cover either system. However, patients should verify coverage and understand any potential differences in copays or deductibles between systems.
Technology Innovation and Future Considerations
Axonics: Cutting-Edge Technology
Axonics represents the latest in neuromodulation technology:
- Advanced Battery Technology: Lithium-ion rechargeable battery designed for longevity
- Miniaturization: State-of-the-art electronics packed into the smallest available package
- Digital Integration: Smartphone app with advanced features and data tracking
- MRI Innovation: Full-body MRI compatibility through advanced shielding technology
- Wireless Charging: Convenient, safe wireless power transfer
InterStim: Proven Reliability
InterStim offers the advantages of a mature, well-tested system:
- Long-term Data: Over 25 years of clinical experience and patient follow-up
- Established Protocols: Well-documented programming and management approaches
- Surgeon Familiarity: Most experienced neuromodulation surgeons have extensive InterStim training
- Track Record: Hundreds of thousands of successful implantations worldwide
- Refined Techniques: Decades of surgical technique refinement
Looking Toward the Future
Continued Innovation: Both companies continue to invest in research and development:
- Axonics: Focus on advanced programming algorithms, extended battery life, and enhanced patient interfaces
- InterStim: Development of next-generation devices with improved features and capabilities
Emerging Technologies: The field of neuromodulation continues to evolve with potential future developments including:
- Closed-loop systems that automatically adjust stimulation
- Improved targeting techniques for optimal lead placement
- Enhanced diagnostic tools for patient selection
- Combination therapies integrating multiple treatment approaches
Making Your Decision: Key Factors to Consider
Primary Decision Factors
When choosing between Axonics and InterStim, consider these crucial factors:
1. Age and Long-term Perspective
- Younger patients may benefit more from Axonics’ 15+ year battery life
- Older patients may be less concerned about multiple future surgeries
2. Lifestyle and Activity Level
- Active patients may prefer the smaller, more comfortable Axonics device
- Patients who prioritize simplicity might prefer InterStim’s no-maintenance approach
3. Future Healthcare Needs
- Consider the likelihood of needing future MRI scans
- Axonics provides more flexibility for future diagnostic imaging
4. Technology Comfort Level
- Patients who enjoy technology may appreciate Axonics’ smartphone app
- Those who prefer traditional approaches might favor InterStim’s established system
5. Physician Expertise
- Consider your physician’s experience with both systems
- Success rates can be influenced by surgeon familiarity with the chosen system
Questions to Ask Your Physician
When discussing your options, consider asking:
- What is your experience with both Axonics and InterStim?
- Based on my specific condition and anatomy, which system do you recommend?
- What are the success rates you’ve seen with each system?
- How do you handle programming and follow-up care for each system?
- What are the potential complications specific to each system?
- How do the long-term costs compare for my specific situation?
The Phoenix Advantage: Access to Advanced Care
Specialized Expertise in Phoenix
Phoenix residents are fortunate to have access to physicians experienced with both Axonics and InterStim systems. This expertise ensures that patients can make decisions based on their individual needs rather than being limited by provider capabilities.
At Bladder Center Phoenix, our experience with both systems allows for truly personalized treatment recommendations based on:
- Patient age and life expectancy
- Specific symptoms and medical history
- Lifestyle and activity requirements
- Long-term healthcare goals
- Personal preferences regarding technology and convenience
Comprehensive Evaluation Process
The decision between Axonics and InterStim should be made as part of a comprehensive evaluation that includes:
- Detailed Symptom Assessment: Understanding the specific nature and severity of your symptoms
- Medical History Review: Evaluating previous treatments and medical conditions
- Imaging Studies: When appropriate, imaging to evaluate anatomy and optimal device placement
- Trial Stimulation: Testing response to sacral neuromodulation before permanent implantation
- Lifestyle Assessment: Understanding how treatment fits into your daily life and future plans
Patient Success Stories: Both Systems Work
Maria’s Axonics Success
Maria, a 39-year-old Phoenix marketing executive, chose Axonics after careful consideration:
“I researched both options extensively. The combination of the smaller device, longer battery life, and MRI compatibility made Axonics the clear choice for me. I’m young and active, and I wanted technology that would grow with me rather than limit me.”
Results after one year:
- 90% reduction in urgency episodes
- Complete elimination of urgency incontinence
- Return to high-intensity exercise without concerns
- Excellent satisfaction with smartphone app control
David’s InterStim Journey
David, a 71-year-old retired Phoenix firefighter, selected InterStim:
“My doctor had done hundreds of InterStim procedures with great success. At my age, I wasn’t as concerned about future surgeries, and I liked the idea of a system with such a proven track record. The thought of not having to charge anything was appealing.”
Outcomes at 18 months:
- Significant improvement in urinary retention
- Elimination of daily catheter use
- Major improvement in quality of life
- Very satisfied with treatment choice
The Common Thread: Both patients achieved excellent results with their chosen systems. Success is possible with either option when appropriate patient selection and expert implantation are combined.
Addressing Common Concerns
“How Do I Know Which System Is Right for Me?”
The best system for you depends on your individual circumstances:
- Consult with an experienced physician who works with both systems and can provide unbiased recommendations
- Consider your age and long-term goals when evaluating battery life differences
- Think about your comfort with technology and whether you prefer simple or advanced device features
- Evaluate your future healthcare needs, particularly potential MRI requirements
- Discuss your lifestyle and activity level with your physician
“What If I Choose Wrong?”
It’s natural to worry about making the wrong decision, but several factors should provide reassurance:
- Both systems are highly effective for appropriate candidates
- Success rates are excellent for both Axonics and InterStim
- Revision options exist if needed, though they’re rarely necessary
- Your physician’s expertise in patient selection and device programming is more important than the specific system chosen
“Is Newer Always Better?”
While Axonics offers technological advances, InterStim’s long track record is also valuable:
- Innovation Benefits: Axonics’ advances in battery life, size, and MRI compatibility are significant
- Proven Reliability: InterStim’s decades of use demonstrate long-term safety and effectiveness
- Individual Considerations: The “best” system depends on your specific needs and priorities
The Role of [Urinary Incontinence](/urinary-incontinence) Treatment
Both Axonics and InterStim are highly effective for treating various forms of [urinary incontinence](/urinary-incontinence), including:
- Urgency Incontinence: Loss of urine associated with sudden, strong urges to urinate
- Mixed Incontinence: Combination of urgency and stress incontinence symptoms
- Overflow Incontinence: Related to urinary retention and incomplete bladder emptying
The comprehensive approach to treating urinary incontinence often involves addressing multiple symptoms simultaneously, which both systems can accomplish effectively.
Looking Forward: Your Decision Timeline
Typical Decision Process
Most patients follow a similar timeline when choosing between Axonics and InterStim:
Week 1-2: Initial consultation and education about both systems
Week 3-4: Additional research and consideration of personal factors
Week 5-6: Follow-up consultation to discuss preferences and make decision
Week 7-8: Pre-operative preparation and trial stimulation scheduling
Week 9-10: Trial stimulation period and evaluation of response
Week 11-12: Permanent implantation procedure (if trial successful)
Taking Your Time
Don’t rush this important decision:
- Gather Information: Research both systems thoroughly
- Ask Questions: Ensure all your concerns are addressed
- Consider Your Future: Think about long-term implications
- Consult Others: Speak with family members or friends who might provide valuable perspectives
- Trust Your Instincts: Choose the option that feels right for your situation
Ready to Choose Your Path to Better Bladder Health?
The choice between Axonics and InterStim represents an important decision in your journey toward better bladder and bowel health. Both systems offer excellent clinical results and can dramatically improve your quality of life. The key is selecting the system that best aligns with your individual needs, lifestyle, and long-term health goals.
At Bladder Center Phoenix, we’re committed to helping you make an informed decision based on your unique situation. Our experience with both systems allows us to provide unbiased recommendations and expert care regardless of which system you choose.
Whether you’re drawn to Axonics’ technological innovations and longer battery life, or you prefer InterStim’s proven track record and established protocols, the most important step is moving forward with treatment that can give you back your freedom and confidence.
Your journey to better bladder health doesn’t have to be traveled alone. Expert guidance, comprehensive evaluation, and personalized treatment recommendations can help ensure you make the best decision for your long-term health and happiness.
Ready to explore your options between Axonics and InterStim? Contact Bladder Center Phoenix today to schedule your comprehensive consultation. Discover which advanced sacral neuromodulation system is right for your unique needs and take the first step toward lasting relief. Call now or visit our website to schedule your free consultation—your personalized treatment plan awaits.