Roser Koenig Mouth Gag, 19 cm or 16 cm, with Ratchet

What the Roser Koenig mouth gag is

The Roser Koenig mouth gag works like a pair of scissors run backward. The jaws go in between the back teeth closed, and squeezing the handles together drives the jaws apart. A ratchet between the handles catches the opening and holds it, so the hand can let go. Long handles give leverage, which is what a heavy, tense jaw needs at the start of a tonsil case.

Google AI Mode, read on 5 November 2026, describes the Roser Koenig mouth gag as a self retaining surgical instrument used in dental, oral, maxillofacial and ENT surgery. In its words, it has a scissor style, bayonet shaped frame designed to lock the jaw in an open position for an unobstructed view and stable access. A ratchet and lever hold the opening at the width set, the curved jaws stay out of the surgeon’s line of sight, and outward facing serrations grip the teeth. It gives a shorter and a longer length.

Gemini, read the same day, places it in ENT, oral and maxillofacial surgery and adenotonsillectomy, on the biting surfaces of the molars, the dental arches and the back of the cheek. It lists the Koenig mouth gag and the Roser mouth spreader as catalog names, and sets it apart from the Denhardt by its long scissor handles and the ratchet arc made for wide spreading along the back teeth.

That makes it a tonsillectomy mouth gag first. In a mouth gag for tonsillectomy, the jaw has to be held wide for the whole case while the throat is worked on, and the scissor leverage and the ratchet do exactly that. As a self retaining mouth gag, it needs no hand on it once it is set.

Key design features

Scissor action

The handles and jaws cross at a single joint, as a scissor does, but squeezing the handles opens the jaws. The long handles multiply the hand’s force at the teeth, so a tense jaw opens without strain on the wrist. Our photograph shows the crossing at the joint and the long handles below it.

A ratchet between the handles

A toothed ratchet runs between the handles in our photograph. As the jaws open, it catches each step and holds it. To close the gag, the catch is released and the jaws come together. AI Mode describes a ratchet and lever with the same job.

Serrated jaw tips

The tips of the jaws are serrated. They bite on the biting surfaces of the back teeth and hold there, so the gag does not slide forward out of the mouth as the jaw pushes against it. AI Mode describes the serrations facing outward, toward the teeth.

Two lengths

The listing sells the 19 cm and the 16 cm, both at 30 dollars. The longer gives more leverage and suits an adult jaw; the shorter is lighter and fits a smaller mouth. AI Mode gives a shorter and a longer length for this pattern too.

Which length to order

Two lengths at one price, read off the variations on 5 November 2026. The guide in the second column is ours.

Where it is used

AI Mode and Gemini, read on 5 November 2026, name these cases for the Roser Koenig mouth gag. The reasons in the last column are ours, read off the handles, the ratchet and the jaws.

What it does, and what it must not do

The Roser Koenig mouth gag spreads the jaw open by leverage and holds it on a ratchet. It does not hold the tongue down. Open it steadily, a step at a time; the leverage is strong enough to hurt the teeth if it is forced.

How it compares with the rest of the oral access tray

Ten oral access instruments make up this family on our site. The working ends and handles are read off each listing’s own photograph, the options off the variations and the prices off the order form, on 5 November 2026.

Materials and finish

Every Roser Koenig mouth gag we make is formed from high quality medical grade stainless steel. The steel itself is made to a German specification. We do not publish a grade number.

The Roser Koenig mouth gag has a plain steel finish. Before each case, open it through the full ratchet and close it again. Ratchet teeth worn round let the catch slip, and a gag that slips closed during a case is unsafe, so it should be set aside.

Caring for it

Rinse the Roser Koenig mouth gag as soon as the case ends, before saliva and blood dry in the joint, the ratchet and the serrations. Brush them all, wash it, dry it, and steam sterilize it on the normal cycle with the jaws open. A drop of instrument lubricant on the joint keeps the action smooth.

Ordering and wholesale

The Roser Koenig mouth gag is made by Adas Instruments in our own workshop and sold direct, which is why the price sits where it does against the catalog houses. Order one for a single tray, or in quantity for a hospital list or a distributor line. We do OEM work under your own brand and your own item numbers. Send us a sample and we will hold a run to your pattern rather than ours. Stock items ship from our own workshop. Backorder items take 10 to 12 working days to make. Every instrument carries a three year replacement warranty against manufacturing defects. Production is controlled under an ISO 13485 quality management system.

Frequently asked questions

What is the Roser Koenig mouth gag used for?

It locks the jaw open for a clear, steady view of the mouth in dental, oral, maxillofacial and ENT surgery, in AI Mode’s words. Gemini names adenotonsillectomy. Ours is scissor action with a ratchet, 19 cm or 16 cm, at 30 dollars.

Is a Koenig mouth gag the same instrument?

Yes. Gemini lists the Koenig mouth gag and the Roser mouth spreader as catalog names for this pattern. Both describe the same scissor action gag with a ratchet and serrated jaws that hold the jaw open from the back teeth.

Which Roser Koenig length should I order?

Take the 19 cm for adults and for a tense or heavy jaw, where the extra leverage helps. Take the 16 cm for smaller mouths and children. Both are 30 dollars, and a tray for a mixed ENT list can carry one of each.

Why is it used for tonsillectomy?

A tonsil case needs the jaw held wide for its whole length while both of the surgeon’s hands work in the throat. The scissor leverage opens a tense jaw, and the ratchet holds it there with no hand on the gag.

Can the Roser Koenig be autoclaved?

Yes. It is stainless steel with no coating, and it goes through the normal steam cycle with the rest of the tray. Sterilize it with the jaws open, so steam reaches the joint and the ratchet, and dry it fully.

Related products and categories

Three more instruments from the same oral access tray: the Luniatschek gauze packer, the Bruenings tongue depressor and the Doyen tongue depressor. The rest of the range is under maxillofacial instruments, which sits inside our ENT instruments.