Vacuum erection devices and constriction rings: how they work and what to look for

Status: FDA Class II medical device (external penile rigidity device, product code LKY), exempt from 510(k) premarket notification. Source: FDA Product Classification database and 21 CFR 876.5020, checked 2026-10-17.

In short: a vacuum erection device, or VED, is a non-drug treatment for erectile dysfunction that a man can buy without a prescription (FDA guidance). It uses suction to draw blood into the penis and an elastic ring at the base to help keep it there (NIDDK, Treatment for ED). The American Urological Association (AUA) guideline says men with ED should be told about it, calls it “an effective and low-cost treatment option for select men,” and says only devices with a vacuum limiter should be used (Burnett et al., AUA guideline, Journal of Urology, 2018). This page covers how the device works, the safety features the FDA describes, the side effects, who should be careful, and how to choose one without relying on a brand ranking. Evidence level: a guideline-listed option with a Moderate Recommendation and Grade C evidence; most studies are small and older, with one recent meta-analysis.

How does a vacuum erection device work?

A vacuum erection device pulls blood into the penis with suction, then holds it there with a ring. NIDDK describes three parts: “a plastic tube to put around your penis,” “a pump that creates a vacuum,” and “an elastic ring that helps you to keep an erection” (NIDDK). The FDA’s guidance describes the same sequence: the cylinder goes over the flaccid penis, the hand or motorized pump creates the vacuum, and once an erection forms the user often slides a constriction ring to the base before taking the cylinder off (FDA special controls guidance, 2004). Because it works mechanically, a VED can draw blood in even when nerve signals are disrupted, which is one reason it is used in prostate cancer care (Yuan et al., International Journal of Impotence Research, 2010).

A VED sits alongside pills, injections and implants in the AUA’s list of options, which our overview of ED treatment options beyond pills lays out side by side.

What is a constriction ring, and can it be used on its own?

A constriction ring is a band of soft, flexible material placed at the base of the erect penis to slow blood flowing back out. The FDA’s guidance says a ring can be used alone “when an erection can be achieved but not maintained,” and together with a vacuum pump when an erection cannot be created at all (FDA guidance). Rings are covered by the same FDA classification as vacuum pumps, and the FDA recommends a quick-release tab or handle so the ring can be taken off fast.

The ring carries the most important time warning in the FDA’s labeling recommendations. It asks makers to box a precaution limiting use of the ring “to no longer than 30 minutes per use,” and to warn users not to fall asleep wearing one, because prolonged use “may cause permanent injury to the penis” (FDA guidance, section 5). The instructions that come with a specific device set the rest of its use.

How does the FDA regulate vacuum erection devices?

The FDA regulates vacuum pumps, constriction rings and penile splints together as “external penile rigidity devices,” defined as devices “intended to create or maintain sufficient penile rigidity for sexual intercourse” (21 CFR 876.5020). They are Class II devices under product code LKY, and they are exempt from 510(k) premarket notification (FDA Product Classification, LKY). In plain terms, a maker does not need to send the FDA a premarket submission first, but the device still has to meet the FDA’s general controls and a set of “special controls” written into a 2004 guidance document covering design and labeling.

That guidance also draws a line around what these devices are for. It says devices sold for penile enlargement, for treating curvature such as Peyronie’s disease, or for preventing or reversing ED fall outside this classification and raise “new questions of safety and effectiveness” (FDA guidance, section 2). A product marketed with those claims is not being sold as the device type described here.

Do vacuum erection devices work?

For many men, yes, though the evidence base is mostly small and older studies. The AUA guideline reports high satisfaction, a mean of 77% for both men and their partners, and says VEDs work in the general ED population and in men with diabetes, spinal cord injury, after prostate removal and with other conditions (AUA guideline, Statement 13). A 2025 meta-analysis of 18 studies (1,065 men) with ED that had not responded well to pills found a pooled success rate of 80%, defined as successful intercourse or intercourse satisfaction; its authors called for larger randomized trials (Zhang et al., International Journal of Impotence Research, 2025).

Source: Zhang et al., 2025. These are group averages across studies, not a forecast for any one man. Longer follow-up has been reported too: in a 1993 study of 216 men, about 70% of those who answered a survey a median of 29 months later were still using the device regularly (Cookson and Nadig, Journal of Urology, 1993). Only about 57% of the men answered that later survey, so the figure may not hold for everyone who tried the device. For how ED is linked with blood sugar, see ED and diabetes.

What side effects does NIDDK list?

NIDDK lists four things to expect: you may need practice or adjustment, the penis may feel cold or numb, it may look purple or bruised, and ejaculation may be weaker. It adds that the bruises “are usually painless and will disappear in a few days,” and that a weaker ejaculation “doesn’t affect the pleasure of climax or orgasm” (NIDDK). The AUA’s list is similar: short-lived pinpoint spots or bruising, discomfort or pain, difficulty with ejaculation and difficulty with the device, and it says most of these “are minor and resolved without intervention” (AUA guideline).

Bruising is the most common. The 2025 meta-analysis put its pooled rate at 24.3%, and higher, at 31.4%, in men with spinal cord injury (Zhang et al., 2025). The FDA’s sample troubleshooting sheet links redness and bruising to pumping too fast or too much, and recommends seeing a physician if it continues past the first few practice sessions (FDA guidance, Attachment 1).

Who should be careful with a vacuum device, such as men on blood thinners?

Men who bleed or bruise easily are the main group to check first. The AUA says men “receiving anti-coagulant therapy and/or who have bleeding disorders or have a history of priapism should use VEDs with caution” (AUA guideline, Statement 13). The FDA’s recommended labeling goes further and tells users not to use a vacuum pump if they have sickle cell disease, a history of prolonged erections, or are “taking large quantities of aspirin or other blood thinners,” because these raise the risk of bruising and hematoma, a swelling filled with blood (FDA guidance, section 5). Do not stop or change a blood thinner to use a device; that is a conversation for the clinician who prescribed it.

The FDA’s recommended warnings and precautions name a few other groups:

• Reduced feeling in the penis. Do not use the device, because a man who cannot feel pain may not know he is being injured.
• Weak hands. Do not use the device if reduced hand strength would make the ring hard to remove.
• Alcohol or drugs. Do not use a pump or ring under their influence, because judgment is impaired.
• Peyronie’s disease, priapism or a urethral stricture. The device may make these conditions worse. Our explainers on Peyronie’s disease and priapism cover each one.

What features matter, such as a vacuum limiter?

The vacuum limiter is the one feature the AUA names directly: “Only VEDs containing a vacuum limiter should be used,” whether the device is bought over the counter or by prescription (AUA guideline). The FDA describes it as an automatic safety valve that limits vacuum pressure, and notes that vacuum pumps typically draw less than 17 inches of mercury (FDA guidance, section 4). The rest of the FDA’s design recommendations make a practical checklist:

Source: FDA special controls guidance, sections 4 and 5.

What is the best vacuum pump for erectile dysfunction?

No guideline or study we found names a single best vacuum pump, and this page does not rank brands. The sources describe a safe device instead: one with a vacuum limiter, a quick release, rings in several sizes with a grab tab, and clear instructions (AUA guideline; FDA guidance). Beyond those features, the right device is the one that fits a man’s body, hands and health, and a clinician can help match it.

How do you choose a device without a ranking?

Start with the features table above, then add three practical checks. First, make sure the description names a vacuum limiter or automatic pressure-relief valve, because the AUA treats it as essential. Second, decide between a hand pump and a battery pump based on hand strength and dexterity, since the FDA warns against use if weak hands would make removal hard. Third, think about getting the device through a clinician. The FDA notes these are over-the-counter devices but are “often used in consultation with a physician,” and makers may choose to sell only through professional channels. In that setting, the FDA says, a physician evaluates whether a device is appropriate and goes over any instructions specific to you (FDA guidance, footnote 4).

Expect a learning curve. NIDDK says you “may need to practice with or adjust” the device, and a review of studies after prostate surgery found results appeared better when men were enrolled in programs built around helping them keep using it (Pirola et al., International Journal of Impotence Research, 2023). Be wary of any device sold with enlargement or “reversal” claims, which fall outside the FDA classification described above.

Penile implant vs pump: what is the difference?

The main difference is surgery. A vacuum device is external, used only when needed and removed afterward, while a penile implant is placed inside the body in an operation (NIDDK). NIDDK says “Most people with ED do not need surgery,” and that an implant is considered when other options have been tried and the ED has not improved. The AUA lists both as options men should be told about, the implant with a Strong Recommendation (Statement 18), and says implant surgery should not be done while a man has a body-wide, skin or urinary tract infection (Statement 20) (AUA guideline). Some implants also use a small pump placed in the scrotum, which is a different thing from an external vacuum pump.

Sources: NIDDK; AUA guideline; FDA guidance.

How does a vacuum device compare with injections?

Both work without relying on a pill, and in one small randomized crossover trial both proved workable over the long term. Fifty men tried each method in turn; among the 44 who finished, 57% preferred injections, 27% the vacuum device and 14% wanted both, and 80% were still using one or both methods 18 to 24 months later (Soderdahl et al., British Journal of Urology, 1997). Younger men, men with ED of shorter duration and men whose ED followed prostate removal leaned more strongly toward injections. The trial is old and small, so it shows that preferences vary rather than which method is better.

Can a vacuum device help after prostate cancer treatment?

It is one of the tools used after prostate surgery. The AUA lists men after prostatectomy among those in whom VEDs are effective (AUA guideline), and a 2010 review describes VEDs as the centerpiece of many “penile rehabilitation” programs because they draw blood in regardless of nerve damage (Yuan et al., 2010). A 2023 scoping review of 16 studies found that every study reported better erectile function scores with a VED, alone or with a pill, than in comparison groups, though the studies used different schedules and lengths of treatment (Pirola et al., 2023). In a dedicated VED clinic run at two Irish teaching hospitals, men’s scores improved with a VED after surgery but stayed below their pre-surgery level (Nason et al., International Journal of Impotence Research, 2016). Our guide to ED after prostate cancer treatment covers recovery timelines and the other options.

When should you talk to a clinician about a vacuum device?

Before buying one, if you have not had your ED checked. The FDA’s recommended warning tells users to see a physician first “to avoid a potentially harmful delay in diagnosing” causes such as diabetes, multiple sclerosis, liver cirrhosis, chronic kidney failure or alcohol use disorder (FDA guidance, section 5). Our explainer on how ED is diagnosed covers what that check usually involves. Talk to a clinician too if you take a blood thinner, have a bleeding disorder, sickle cell disease, Peyronie’s disease or reduced feeling in the penis, or if bruising, pain or numbness keeps coming back. Whether a VED fits, and how it fits with any other treatment, is a decision for you and your clinician. Our guide on when to see a doctor about ED covers how to raise it.

Sources

1. Burnett AL et al. Erectile Dysfunction: AUA Guideline. Journal of Urology, 2018 (Statement 13 and discussion)
2. Erectile Dysfunction: AUA Guideline, American Urological Association (Statements 13, 18 and 20)
3. Treatment for Erectile Dysfunction, National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), last reviewed October 2024
4. 21 CFR 876.5020, External penile rigidity devices, Electronic Code of Federal Regulations
5. Product Classification: device, external penile rigidity (product code LKY), US Food and Drug Administration
6. Class II Special Controls Guidance Document: External Penile Rigidity Devices, US Food and Drug Administration, December 2004
7. Zhang F et al. Efficacy of vacuum erectile device in refractory erectile dysfunction: a systematic review and meta-analysis. International Journal of Impotence Research, 2025
8. Cookson MS, Nadig PW. Long-term results with vacuum constriction device. Journal of Urology, 1993
9. Soderdahl DW et al. Intracavernosal drug-induced erection therapy versus external vacuum devices in the treatment of erectile dysfunction. British Journal of Urology, 1997
10. Yuan J et al. Vacuum therapy in erectile dysfunction: science and clinical evidence. International Journal of Impotence Research, 2010
11. Pirola GM et al. Vacuum erection device for erectile function rehabilitation after radical prostatectomy: which is the correct schedule? A systematic, scoping review. International Journal of Impotence Research, 2023
12. Nason GJ et al. Efficacy of vacuum erectile devices (VEDs) after radical prostatectomy: the initial Irish experience of a dedicated VED clinic. International Journal of Impotence Research, 2016