Unique Features of Theros® FMS Dilators

FMS stands for “Flexibilisation and Massage System”. This name already reveals much about our alternative approach compared with conventional dilators – inspired by nature:

• The new shape, inspired by the form of a fish (the narrower section is at the rear), prevents tissue compression as seen with wedge-shaped dilators.
• Moving the elliptical head back and forth creates gentle “waves” – producing a muscle-relaxing massage effect.
• Borosilicate glass, with its unmatched smooth surface, glides effortlessly like a fish through water and remains permanently hygienic.

Because of their unique design, FMS dilators are above all exceptionally gentle and tissue-friendly.

At the same time, they fulfil far more functions than conventional dilators:

• Stretching – but not primarily through widening and tissue compression as with conical silicone dilators. Instead, they use an alternative, exceptionally gentle method (see instructions for use).

• Massage without irritation of the mucous membranes: to help release spasms (vaginismus) or to gently reinnervate and revitalise scarred, hardened or traumatised tissue following radiotherapy or birth injuries.

• Treatment of hemorrhoids with optimal size selection according to individual anatomy and severity.

• Prostate massage / prostate stimulation – particularly effective thanks to exceptional glide, head shape and precise controllability.

• Cooling or heat applications (from approximately 30 mm diameter upwards) as an additional option: for example, flexibilisation with relaxing warmth or hemorrhoid treatment with decongesting cooling.

The Philosophy and Development of FMS Dilators

The development of FMS dilators is based on addressing the weaknesses of conventional conical silicone dilators. The focus: the gentlest possible application – in line with our philosophy of “quality without compromise”.

These quality features explain the exceptional effectiveness of our glass dilators – confirmed both in practice and through the highly positive feedback from many users.

Thanks to their special shape (the area of action is located at the head), regions deeper inside the body can also be targeted precisely – for example during prostate massage or treatment of vaginal tears – without the need to insert the entire dilator. The slim shaft protects the vaginal entrance or anal sphincter. The extremely smooth surface prevents irritation of the mucous membranes – whether during vaginal massage to loosen and revitalise tissue or during prostate massage to support a healthy prostate, potency and erections. Hemorrhoids often disappear after the very first application when repositioning is combined with cooling.

Applications

Vaginal Applications:

• Vaginismus
• Lichen sclerosus
• Birth preparation / perineal massage
• Birth or surgical injuries
• Dyspareunia – pain during vaginal penetration, including during menopause
• Neovagina
• Vaginal stenosis (after radiotherapy)

Anal Applications:

• Hemorrhoids
• Anal fissures
• Anal spasm

Unique Features of FMS Dilators

1. New shape for easier insertion
2. The smoothest surface of all materials according to ISO 25178
3. The world's largest range with 27 sizes
4. Can also be used to target deeper areas inside the body
5. All Sizes Are the Same Length
6. Effective in both directions
7. Sustainably temperature-controlled
8. 100% hygienic, biocompatible and sustainable
9. Certified medical device

1. A New Shape for Gentle Insertion

The conical shape of conventional dilators causes compression of the tissue during insertion, which increases significantly with depth. The vaginal entrance (or anal sphincter) yields to the pressure, contracts and can ultimately only be overcome with considerable force. The pain caused by the “thick end” may even be retraumatising.

For this reason, we completely redesigned the shape. The effective part of our glass dilators is not the thick rear section but the elliptical head. In nature, the ellipse represents minimal resistance in water and air. It glides smoothly into the body because tissue can “flow” backwards along the taper instead of being compressed. Around the slim shaft, tissue can move freely in both directions without pressure – everything remains “in flow”.

When moved back and forth, the ellipse creates a gently pulsating wave movement within the area of application – similar to a massage. Seven different silhouettes provide varying stimuli when several dilators from a set are used. The result: maximum effectiveness with maximum gentleness.

2. The Smoothest Surface According to ISO 25178

Silicone and plastic have inferior glide due to their surface structure and are also more problematic from a hygiene perspective. FMS dilators are made from mouth-blown borosilicate glass without seams – extremely durable and with the smoothest surface available. This makes applications possible in highly sensitive or traumatised areas without irritating the mucous membranes, for example in cases of inflamed hemorrhoids, after surgery, during extended flexibilisation massages or for prostate massage.

3. 27 Sizes for Individual Adaptation

We offer 27 sizes in 1–2 mm increments, multiple standard sets and freely configurable sets for vaginal or rectal applications – the largest range in the world. This allows you to find the ideal sizes for your body, your condition (for example Grade 1–3 hemorrhoids) and even for erotic stimulation or self-exploration.

Here we provide tips on how to determine the right size or the most suitable set for your application.

For applications below 14 mm, we offer our Theros® Bougie Dilators made from implant-grade steel.

4. Extended Range of Applications

With conventional conical dilators, the largest diameter is located at the rear. Their effect is therefore concentrated on the vaginal entrance or anal sphincter. Targeted treatment of deeper internal areas is difficult, and the pointed shape is not ideal for this purpose. We have changed that.

The area of action of our FMS dilators is located at the front elliptical head. This offers two advantages: effectiveness is not dependent on insertion depth, and internal problem areas can be treated precisely without excessively straining the entrance muscles. The gentle shape of the head allows broad, gentle stimulation or massage – for example of the prostate.

5. All Sizes Are the Same Length

Silicone dilators with smaller diameters are often shorter because the material lacks sufficient stability.

FMS dilators retain their shape and allow precise, safe control even at small diameters – which is why all sizes have the same length. This is particularly important at the beginning of treatment, as it allows the full length of the vaginal canal or rectum to be prepared gently without limiting effectiveness.

6. Effective in Both Directions

FMS dilators are not only effective during insertion, but especially through the alternating movement of insertion and withdrawal. When you “hold” the head in place, you intensively train the pelvic floor, vaginal muscles and sphincter muscles. The extremely smooth glass dilators allow this back-and-forth movement to be increased without irritating the mucous membranes – even to the point where it simulates the movement of a penis inside the vagina during sexual intercourse. This allows you to become accustomed to vaginal penetration again in a gentle and self-determined way – for example in cases of vaginismus or after a long period of abstinence. Here too, the advantage of the nature-inspired FMS shape becomes evident, as it simulates both the penis and the glans.

7. Sustainably Temperature-Controlled

FMS dilators from 30 mm upwards contain a sufficiently large cavity to allow long-lasting warming or cooling using water-soaked tissue paper. Warmth supports stretching, massage and erotic stimulation. Cold has a decongesting and anti-inflammatory effect and should be used when treating inflamed hemorrhoids. Further information can be found in the sections on vaginal and anal applications.

8. 100% Hygienic, Biocompatible and Sustainable

Borosilicate glass is not only extremely durable and smoother than any other material, but unlike silicone it is completely resistant to odours and discolouration, inert and biocompatible. The pore-free surface is easy to clean and, with simple cleaning, even fulfils clinical hygiene requirements. In addition, borosilicate glass is completely environmentally neutral and sustainable, unlike silicone.

9. Certified Medical Device

As a certified Class I medical device, the effectiveness of our dilators has been demonstrated. Their safety of use is confirmed by CE certification.

The Fascination of Borosilicate Glass

Borosilicate glass is a fascinating material. It was developed for the most demanding technical applications, is incredibly durable, withstands extreme temperature shocks and is completely resistant to acids and alkalis. FMS glass dilators therefore exceed the safety requirements of medical device regulations by a considerable margin. Specifications, safety certificates and breakage tests can be found in our downloads section.

At the same time, borosilicate glass possesses a fascinating refraction of light that evokes sensuality – which is why it is also frequently used in art.

FMS Dilators – Handmade with Care

Every FMS dilator is mouth-blown, manufactured in multiple stages and carefully inspected. Each piece is unique and combines the aesthetic value of craftsmanship with maximum effectiveness in use.