CaverSTIM device shows initial promise for post-prostatectomy erectile dysfunction

madman

Super Moderator
* Electrical neurostimulation of the penis, they explain, targets the penile-nerve supply that may be impaired by disease, injury, or aging, thus promoting authentic nerve functioning. The authors argue that this approach may address limitations of existing treatments by acting as a restorative therapy rather than a compensatory one.


* “We are grateful to Dr. [Arthur] Burnett, and the other co-authors for advancing this work, which we believe will represent a cornerstone for the field of neurostimulation and erectile dysfunction management. By stimulating the cavernous nerves at a time when injury is predictable, we may be able to promote neural rehabilitation and facilitate functional recovery rather than accepting postoperative erectile dysfunction as inevitable. While larger controlled trials are required, the early data strongly support continued clinical investigation.”


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Key Takeaways
  • The CaverSTIM device demonstrated safety and feasibility in a first-in-man study, with 9 out of 10 patients regaining potency post-RARP.
  • The study reported no device-related infections or pain, and only mild, transient discomfort in two patients.
  • A larger clinical trial is planned to further evaluate the device's safety, tolerability, and efficacy in restoring erectile function.
  • Neurostimulation targets impaired penile-nerve supply, potentially offering a restorative therapy for erectile dysfunction rather than a compensatory one.









Data from a first-in-man clinical study (NCT05650866) of the CaverSTIM device have been published in BJU International, showing encouraging outcomes with the implantable cavernous nerve neurostimulator in restoring erectile function following robot-assisted radical prostatectomy (RARP).1

In addition to the early phase trial results, a review on the scientific rationale for using implantable neurostimulation was concurrently published in Nature Urology Review.2


Pim van WeselImage Credit: Comphya

Pim van Wesel


“These publications reflect a major step forward for CaverSTIM and for Comphya,” said Pim van Wesel, CEO of Comphya, in a news release from the company.2 “Seeing our technology validated in a first-in-man clinical study reinforces our confidence that neuromodulation can meaningfully improve quality-of-life outcomes for men undergoing prostate cancer surgery. This progress is an important milestone as we work toward making erectile function rehabilitation a realistic expectation rather than an exception.”

First-in-man study

In total, the prospective pilot study included 10 men who were potent before undergoing RARP. All patients received the CaverSTIM implant during the procedure and were asked to activate the device every day during the 6 months of follow-up.4

Overall, use of the device was shown to be safe and feasible, with no device explantations, device-relation infections, nor pain reported during stimulation. Two patients reported mild, transient discomfort. Implantation of the device added approximately 45 minutes to the RARP procedure.

Patients in the study also showed promising early functional outcomes, with 9 of 10 patients regaining potency following prostatectomy. Many patients in the trial were also able to resume unaided sexual intercourse.


Based on these results, Comphya announced plans to initiate a larger controlled clinical trial of the CaverSTIM device following completion of the pilot studies. The larger scale trial would build on these initial studies by further assessing the safety, tolerability, and efficacy of the device in restoring erectile function post-prostatectomy. The company also noted that use of the CaverSTIM device is being explored for other neurogenic causes of erectile dysfunction, such as spinal cord injury.


Rationale for neurostimulation

Investigators also published a scientific review outlining the rationale for implantable neurostimulation for managing post-prostatectomy erectile dysfunction. According to the authors, this approach is backed by 150 years of research showing erection responses following electrical stimulation.

Electrical neurostimulation of the penis, they explain, targets the penile-nerve supply that may be impaired by disease, injury, or aging, thus promoting authentic nerve functioning. The authors argue that this approach may address limitations of existing treatments by acting as a restorative therapy rather than a compensatory one.


Rodrigo Fraga, PhDImage Credit: Comphya

Rodrigo Fraga, PhD


“The strength of this technology lies in its alignment with our understanding of erectile neurophysiology,” concluded co-author Rodrigo Fraga, PhD, COO of Comphya, in the news release. “We are grateful to Dr. [Arthur] Burnett, and the other co-authors for advancing this work, which we believe will represent a cornerstone for the field of neurostimulation and erectile dysfunction management. By stimulating the cavernous nerves at a time when injury is predictable, we may be able to promote neural rehabilitation and facilitate functional recovery rather than accepting postoperative erectile dysfunction as inevitable. While larger controlled trials are required, the early data strongly support continued clinical investigation.”
 
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Advancements in Neuromodulation for the Treatment of Sexual Dysfunction
Executive Summary
Recent clinical developments and systematic reviews indicate that neuromodulation—specifically the use of implantable neurostimulators—represents a significant shift in the management of sexual dysfunction. Traditionally, treatments for erectile dysfunction (ED) have been compensatory (e.g., PDE5 inhibitors or injections). However, emerging technologies like the CaverSTIM™ device aim to be restorative, promoting neural rehabilitation and functional recovery of the cavernous nerves.
A landmark first-in-man pilot study demonstrated that the CaverSTIM device is safe and feasible, with 9 out of 10 patients regaining potency following robot-assisted radical prostatectomy (RARP). Concurrently, broader systematic reviews suggest that various neuromodulation interventions, including spinal cord stimulation (SCS) and peripheral nerve stimulation (PNS), show promise in improving sexual desire, arousal, and satisfaction across both male and female populations. While these initial outcomes are highly encouraging, the field requires larger controlled trials to establish definitive efficacy and standardized treatment protocols.
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The Landscape of Sexual Dysfunction and Current Limitations
Sexual dysfunction is defined as significant distress caused by repeated problems related to sexual experience, response, and pleasure. It is categorized into desire, arousal, orgasmic, and genital pain disorders.
Impact on Patient Quality of Life
Emotional and Physical: Dysfunction leads to distress, lack of functionality, and increased risks of depression and mood disorders.
Interpersonal: It negatively impacts marital satisfaction and can threaten a couple’s ability to conceive.
Neurological Etiology: In patients with conditions such as Parkinson’s, multiple sclerosis, or spinal cord injuries, the disruption of long spinal tracts or pelvic autonomic nerves makes sexual dysfunction pathologically distinct and often harder to treat.
Limitations of Existing Treatments
Most current therapies are compensatory rather than restorative:
Pharmaceuticals: PDE5 inhibitors (e.g., sildenafil) and injections (alprostadil) manage symptoms but do not repair underlying nerve damage.
Mechanical/Surgical: Vacuum constriction devices and penile prostheses provide functional solutions without restoring natural biological pathways.
Psychosexual Therapy: Often the only option for many disorder types but limited in addressing physical nerve impairment.
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CaverSTIM™: A Restorative Approach to Post-Prostatectomy ED
CaverSTIM, developed by Comphya SA, is a first-in-class implantable neurostimulator designed to restore erectile function in patients who do not respond to oral medications, particularly following prostate cancer surgery.
First-in-Man Clinical Study Outcomes (NCT05650866)
A prospective pilot study involving 10 men who were potent before undergoing RARP yielded the following results:
Efficacy: 90% (9 of 10) of patients regained postoperative potency. Many patients were able to resume unaided sexual intercourse.
Safety and Tolerability: No device-related infections, no pain during stimulation, and no device explantations were reported.
Surgical Impact: The implantation of the device added approximately 45 minutes to the standard RARP procedure.
Patient Experience: Two patients reported only mild, transient discomfort. The daily stimulation routine is generally imperceptible to the user.
Device Mechanics and Operation

ComponentDescription
Implantable Pulse Generator (IPG)Contains a rechargeable battery and electronics; implanted subcutaneously in the lower abdomen.
Electrode ArrayTwo arrays implanted in the pelvic cavity to activate nerves responsible for penile erection.
External ControllersUsed by clinicians to tailor parameters and by patients to operate the system remotely.
Scientific Rationale: Neural Rehabilitation
The rationale for this technology is based on over 150 years of research regarding electrical stimulation and erection responses. By stimulating the cavernous nerves at a predictable time of injury (during surgery), the device promotes neural rehabilitation. This approach targets the penile-nerve supply impaired by disease or aging, aiming for "authentic nerve functioning" rather than accepting postoperative ED as an inevitable outcome.
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Systematic Review of Broad Neuromodulation Interventions
A 2022 systematic review analyzed the efficacy of various neuromodulation interventions, including spinal cord stimulation (SCS), peripheral nerve stimulation (PNS), and sacral nerve stimulation (SNS), for treating sexual dysfunction.
Key Findings by Gender
Male Patients: Improvements were noted in erectile function, sexual desire, and overall satisfaction. (Note: One study reported a decline in ejaculation and orgasm, highlighting the need for more research).
Female Patients: Improvements were observed in desire, arousal, orgasm, lubrication, and quality of "sex life," as well as a reduction in dyspareunia (genital pain).
Efficacy and Utility
Neuromodulation interventions, originally indicated for chronic pain (SCS) or urinary/bowel dysfunction (SNS), often result in secondary positive improvements in sexual function. This suggests a potential utility for these therapies even when sexual dysfunction is not the primary indication.
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Future Directions and Clinical Considerations
While the early data for devices like CaverSTIM and broader neuromodulation are promising, several gaps remain:
Clinical Trials: Comphya plans to initiate larger controlled trials to further evaluate the safety and efficacy of CaverSTIM.
Expanded Indications: Research is ongoing to determine if these technologies can benefit other neurogenic causes of ED, such as spinal cord injuries.
Standardization: Further research is required to determine how different stimulation parameters (waveform, amplitude, and frequency) affect outcomes.
Risk Factors: It remains unknown if patients with high preoperative opioid requirements or extensive histories of genitourinary surgery will achieve the same level of success.
Key Quotes
"This progress is an important milestone as we work toward making erectile function rehabilitation a realistic expectation rather than an exception." — Pim van Wesel, CEO of Comphya
"By stimulating the cavernous nerves at a time when injury is predictable, we may be able to promote neural rehabilitation and facilitate functional recovery rather than accepting postoperative erectile dysfunction as inevitable." — Rodrigo Fraga, PhD, COO of Comphya
 

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