How Long Does Vacuum Bell Therapy Take? A Timeline

Most published cohorts describe vacuum bell therapy in years, not months. Zhou and colleagues (2024, n=65) reported a mean treatment duration of 23.2 months, and Cincinnati Children's Hospital describes the device as worn daily over one to two years. The strongest outcomes are tied to sustained daily use over months rather than weeks.

Key points

• Published cohorts measure this therapy in years. Zhou and colleagues (2024, n=65) reported a mean treatment duration of 23.2 months, with a wide spread (SD 9.86 months).
• The two things that most influence the result are starting while the cartilage is still pliable and keeping daily use going over months rather than weeks.
• Cincinnati Children's Hospital describes the device as worn daily over one to two years.
• The daily commitment is a minimum of 30 minutes twice daily initially, extending to several hours daily thereafter (Haecker 2016).
• Adherence, not the device, sets most timelines. Zhou and colleagues (2024) found 60% of children paused use for more than two weeks at least once, which works against the consistency the outcome data rewards.
• No validated treatment-length guideline exists after 20 years of clinical use (Haecker et al. 2024).

The short answer, expanded

Vacuum bell therapy uses a silicone suction cup and a hand pump to create negative pressure over the sunken part of the chest, lifting the sternum and the attached rib cartilage while the device is applied. Turning that repeated lift into a change that persists takes a long time, because the mechanism is gradual remodelling rather than a single manoeuvre.

There is no single duration to quote, and anyone who gives you one is guessing. What the literature supports is a range measured in years, with the low end near a year for shallow deformities in very young children and the high end well past two years for adolescents and adults. The mean treatment duration in a recent caregiver survey was 23.2 months (Zhou et al. 2024, n=65), and Cincinnati Children's Hospital describes daily wear over one to two years. Two things move a given person within that range: how young they start and how consistently they use the device. Both are covered below, because a timeline you cannot keep is not a timeline.

What the evidence actually shows

How long treatment actually runs

The clearest duration figure comes from Zhou and colleagues (2024, n=65), a caregiver survey published in Frontiers in Pediatrics. Mean treatment duration was 23.20 months, with a standard deviation of 9.86 months. That spread matters as much as the average, because a roughly two-year mean hides children who finished sooner and children still going well past three years. These are subjective caregiver reports rather than imaging, so read the duration as what families actually did, not as a fixed prescription.

What separates fast from slow

Duration is not random. The published cohorts run for years rather than months: Scaife and colleagues (2025, n=240) reported a successful outcome in 66% of patients, and a Swiss cohort at University Hospital Basel reported significant improvement in about 80% of 140 patients. Two things separate the people who respond from the people who do not. Younger cartilage is more pliable, so adolescents typically respond faster and more completely than adults. And consistency of daily use over months is the dominant factor in the outcome. The practical reading is blunt. The treatment length this therapy rewards is long, and starting young improves the odds rather than shortening the calendar.

The youngest children

Luo and colleagues (2022, n=139) studied preschool children with a mean age of 4.6 years, also in Frontiers in Pediatrics, tracking chest depth with a three-dimensional scanner. Two factors independently predicted complete correction: shallower initial depth (odds ratio 0.69) and a longer treatment period (odds ratio 1.58). In plain terms, deeper chests and shorter courses did worse. This was short-term follow-up, so it speaks to how long correction takes to reach, not to whether it lasts.

The daily commitment inside the timeline

The calendar is only half the picture. The other half is hours per day. The protocol traced to the modern device sets a minimum of 30 minutes twice daily during an initial period, extending to several hours daily thereafter (Haecker 2016). The engineer who developed the device corrected his own chest over roughly two and a half years of daily use (Klobe cohort). Cincinnati Children's Hospital, a major paediatric centre with no product to sell, describes the device as worn daily over one to two years. After 20 years of clinical application, Haecker and colleagues (2024) note plainly that no validated guidelines for treatment length exist, which is why these figures describe practice rather than prescribe it.

The adherence caution

The number most often misread in this literature is an adherence figure, not a success figure. Zhou and colleagues (2024) found that 39 of the 65 children, or 60%, paused use for more than two weeks at least once. That is not a correction rate and it is not a milestone. It is the consistency problem that lengthens real timelines. Set it against a therapy whose published cohorts are measured in years, and the mechanism is clear. Haje and colleagues (2021, n=115) found that structured support raised adherence from 58% to 83%, which is the gap between those who keep going and those who stop.

Who this works best for

The timeline is shortest and the odds are best for a recognisable group.

• Children and younger adolescents. Cartilage that has not begun to ossify responds faster to sustained deformation, which is why this group typically improves more quickly than adults.
• Shallower deformities. Shallower initial depth independently predicted complete correction in the preschool cohort (Luo et al. 2022, n=139).
• A flexible chest wall. Where the sternum visibly lifts under the device, the mechanical precondition is met and progress tends to come sooner.
• People who can stay consistent for years. Sustained daily use over months is the dominant factor in the outcome. Consistency here is a dosing requirement, not a virtue.

Who this does not work for

A realistic timeline also means naming the people for whom no timeline applies.

• Rigid, ossified chests. If the sternum does not visibly lift under suction, more time does not supply what the mechanism needs. This is common in deep, long-standing adult deformity, which is usually a surgical conversation.
• People who cannot commit the hours. The largest single failure group is not biological. If a minimum of 30 minutes twice daily, building toward several hours, is not realistic in your life for a year or more, the duration data does not describe your case.
• Anyone expecting change in weeks. The immediate post-session lift is temporary and partially reverses within hours (Haecker 2016). Mistaking that for durable progress ends more courses than any biological factor.
• Pectus carinatum. A protruding sternum is the opposite deformity and needs compression bracing, not suction. A vacuum bell is not indicated.

Anyone with breathlessness disproportionate to exertion, palpitations, chest pain or exercise intolerance should be assessed by a physician before starting, because those symptoms change the calculation and are not something a device purchase should precede.

What this means in practice

Three things follow from the evidence.

Plan in years and judge progress in seasons. The realistic unit is one to two years of daily use, and often longer in adolescents and adults. Judging progress week to week guarantees disappointment, because the visible lift after a session is temporary. Measure in the morning, before the first session, using the same landmarks and posture each time, and compare across months rather than from one week to the next.

Protect the timeline by protecting adherence. The single modifiable variable is whether you keep going. Structured support, skin management and scheduled review all act on the pause rate that lengthens real courses (Haje et al. 2021, n=115).

The downside of a trial is small next to the alternative. Surgical repair in the United States commonly runs 40,000 to 70,000 dollars, with uninsured cases reported up to 100,000, and involves a bar in the chest for two to three years plus a second operation to remove it. A vacuum bell trial costs a few hundred dollars and can be stopped at any time. Six months of consistent use is usually enough to see whether a chest is responding, and stopping closes no surgical door.

Not sure whether this applies to you?

The two questions this article cannot answer for you are whether your own chest is a reasonable candidate, and which device size fits it. Both depend on measurements only you can take.

The FormaChest assessment takes about four minutes. It screens your situation against the variables the research identifies as predictive (age, depth of the indentation, chest flexibility and symptoms) and returns an honest read on whether conservative treatment is a reasonable first step. That includes telling you when the answer is to see a surgeon first, which it does for roughly the situations described in the section above.

It also returns a vacuum bell size recommendation based on your own measurements, at no cost.

Sizing is normally not free or simple in this category. The usual process is to email photographs of your bare chest to a company and wait for a reply, or to print paper templates and tape them to yourself, with the manufacturer warning that self-measurement may produce the wrong model. The assessment asks for numbers you can take alone with a ruler. No photographs, no email exchange, no deposit.

Take the free assessment →

What the research does not tell us

A realistic timeline has to include the gaps in the evidence that produces it.

No randomised trials of duration. Every figure here comes from retrospective, observational or survey data. No trial has compared shorter against longer courses head to head, so the 24-month threshold is an association, not a proven dose.

No validated guidelines. Haecker and colleagues (2024) state this directly after 20 years of use. Daily hours, session length and total course length vary between centres, which is a large part of why reported timelines disagree.

Weak durability data. Short-term cohorts like Luo (2022, n=139) show correction can be reached, but whether it holds through later growth is not well established.

Selection bias. Families who stay with a two-year treatment differ from those who do not, which likely makes published timelines look tidier than the general experience.

About this guide This article is published by FormaChest, a European manufacturer of vacuum bell correction systems, registered in Romania as AUGUMENTUM SRL. We make the device described above, and every figure quoted is cited to its source so you can verify it independently. The adherence problem described in this article is the reason FormaChest ships the bell, brace and gel together rather than a device alone: the vacuum bell, a chest support brace, post-session skin care, the written protocol, and scheduled follow-up. Bought together, the bell, brace and gel are $461.40 in the men's line and $491.40 in the women's line, where every competitor in this category sells the device by itself. See what is included →Tomas Titus is the founder of FormaChest (AUGUMENTUM SRL, Craiova, Romania). He had pectus excavatum and corrected it without surgery, documenting his own vacuum bell treatment on camera, taking each measurement before a session rather than after. His chest depth went from 25mm to 4mm. That is one person's result at 19; published adult timelines run 12 to 24 months and results vary. He is not a clinician, and nothing in this article is a substitute for assessment by one.

Related questions

• What is pectus excavatum?
• Does the vacuum bell actually work?
• Why won't my vacuum bell hold a seal?
• Is it too late for a vacuum bell as an adult?
• Can exercise fix pectus excavatum?

References

1. Scaife ER, et al. Vacuum bell therapy for pectus excavatum. 2025. n=240
2. Luo D, Cheng K, Yuan M, Xu C, He T. Efficacy and determinants of vacuum bell treatment in preschool children with pectus excavatum. Frontiers in Pediatrics. 2022. PMID 36313864
3. Zhou L, Deng F, Tian Y, et al. Questionnaire-based subjective evaluation of factors influencing vacuum bell treatment effectiveness in children with pectus excavatum. Frontiers in Pediatrics. 2024. DOI 10.3389/fped.2024.1467215
4. Haecker FM. Vacuum bell therapy. Annals of Cardiothoracic Surgery. 2016. PMID 27747177
5. Haecker FM, et al. 20 years clinical application of the vacuum bell for conservative treatment of pectus excavatum. Journal of Thoracic Disease. 2024. PMID 39268139
6. Haje SA, et al. Adherence in conservative treatment of pectus deformities. 2021. n=115
7. Cincinnati Children's Hospital Medical Center. Vacuum bell therapy for pectus excavatum. Patient education resource.

This article is for information only and is not medical advice. Pectus excavatum should be diagnosed and assessed by a qualified physician. If you have chest pain, breathlessness, palpitations or reduced exercise tolerance, seek medical assessment before beginning any treatment.

Last reviewed: July 2026.