Heister Mouth Gag, Screw Action
$ 45.00
The Heister mouth gag is a mechanical, self retaining surgical instrument used to hold the patient’s mouth open, giving stable, adjustable exposure of the oral cavity against the closing pull of the jaw muscles. AI Mode describes a thumb screw that drives the two flat jaws apart a little at a time and holds them at the width set, used in oral and maxillofacial, dental and ENT surgery. Ours has two straight jaws cross cut at the tips, opened by a screw with a broad thumb disc, at 45 dollars.
Key Features
- Screw action, turned by a broad thumb disc
- Two straight jaws
- Cross cut grip at the jaw tips
- Holds at any width the screw is turned to
- Made from high quality medical grade stainless steel, reusable
- 45 dollars
- Three year replacement warranty against manufacturing defects
- Item code ADT-05.05
Available on backorder
What the Heister mouth gag is
The Heister mouth gag opens the mouth by screw. Its two straight jaws go in between the teeth closed, and a screw at the base, turned by a broad thumb disc, drives them apart. Every turn opens the jaw a little further, and wherever the turning stops, the gag holds. There is no catch to slip and no step to jump: the screw mouth gag holds any width at all, which is why it suits a jaw that is stiff or hard to open.
Google AI Mode, read on 5 November 2026, describes the Heister mouth gag as a mechanical, self retaining surgical instrument used to hold the mouth open during clinical procedures. In its words, it gives stable, adjustable exposure of the oral cavity while resisting the closing pressure of the jaw muscles. Turning the screw drives a threaded bolt that spreads two flat, heavy blades apart step by step and locks the mouth at the width set, and the working ends carry serrations that grip the teeth.
Gemini, read the same day, places it in oral and maxillofacial surgery, general anesthesia and emergency trauma, on the biting surfaces of the teeth, the incisors and the spaces between the teeth. It lists the Heister jaw spreader and the Heister screw mouth gag as catalog names, and sets it apart from the Denhardt by the central thumb screw, where the Denhardt has a ratcheted hand lever.
AI Mode names oral and maxillofacial surgery, dental surgery and ENT surgery, including tonsillectomy, and says the gag widens the view and spares the jaw muscles during a long procedure. As a dental mouth gag, it is the one a dentist reaches for when a patient cannot hold the mouth open for the length of the work.
Key design features
Screw action
Our photograph shows a threaded screw at the base of the jaws, with a broad, flat disc on its end for the thumb and finger. Turning the disc opens the jaws; turning it back closes them. The screw holds by itself, so once it is set the gag cannot creep closed, and the opening can be changed by a fraction of a turn.
Two straight jaws
The two jaws are straight and narrow. Closed, they slip in between the front or the side teeth even when the mouth is barely open; then the screw spreads them. That is the working of a dental mouth spreader: it starts thin and opens wide.
Cross cut tips
The tips of the jaws in our photograph are cut across. The cuts bite on the edges of the teeth and stop the jaws sliding off as they open. AI Mode describes serrated jaws for the same grip against the teeth.
A broad thumb disc
The disc on the screw is wide and flat, so the thumb gets a full purchase on it and the screw turns smoothly under load. A jaw that is clenching pushes back hard, and a small knob would be hard to turn. As a Heister jaw spreader, the disc is the reason it opens a stiff jaw with a steady hand.
What the listing gives you
One pattern at one price, read off the listing on 5 November 2026. What it tells you is set out below, and where each detail was read from.
| What you get | Detail | Read from |
|---|---|---|
| Action | Screw, turned by a thumb disc | Our photograph |
| Jaws | Two, straight | Our photograph |
| Tips | Cross cut | Our photograph |
| Options | One size | The listing |
| Price | 45 dollars | The order form |
Where it is used
AI Mode and Gemini, read on 5 November 2026, name these cases for the Heister mouth gag. The reasons in the last column are ours, read off the screw and the jaws.
| Case | What it holds open | Why this one |
|---|---|---|
| Dental surgery | The jaw, for the length of the work | Screw holds any width |
| Oral and maxillofacial surgery | A stiff or clenched jaw | Thin jaws start between the teeth |
| Tonsillectomy | The jaw, for the throat view | Named by AI Mode |
| Emergency and anesthesia | The jaw, for access to the mouth | Named by Gemini |
What it does, and what it must not do
The Heister mouth gag opens the jaw by screw and holds it there. It does not hold the tongue or the cheeks. Open it a turn at a time; forcing a stiff jaw with the screw can damage the teeth the jaws rest on.
| Job | Use the Heister? | What to use instead or beside it |
|---|---|---|
| Opening a stiff jaw a little at a time | Yes | This is the job it is made for |
| Holding the jaw on a ratchet from one side | No | The Denhardt mouth gag |
| A frame with tongue blades and cheek arms | No | The Dingman mouth gag complete set |
| Holding the tongue down | Beside it | The Wieder tongue depressor |
| Levering a tooth or bone | Never | An elevator |
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.
| Instrument | Working end, from our photograph | Handle or frame, from our photograph | Size or options | Price |
|---|---|---|---|---|
| Bruenings depressor | flat blade at each end, four windows in each | flat strip, angled at the middle | one size | 5 dollars |
| Doyen depressor | broad plain blade, flared at each end | none, the blade is bent through its middle | 16 cm or 13.5 cm | 7 dollars |
| Hartmann depressor | angled blade with a ribbed face | open loop handle | one size | 12 dollars |
| Tobold depressor | angled blade with a ribbed face | solid flat handle | 15 cm or 14.5 cm | 17 dollars |
| Wieder depressor | angled ribbed blade with three windows | slotted handle ending in a hook | four blade sizes | 17 dollars |
| Denhardt gag | two tooth plates | crossing arms with a ratchet and a release lever | one size | 36 dollars |
| Dingman gag set | frame with cheek arms and a tongue blade holder | three tongue blades in the set | complete set | 150 dollars |
| Heister gag (this page) | two straight jaws, cross cut at the tips | a screw turned by a broad thumb disc | one size | 45 dollars |
| Roser-Koenig gag | serrated jaw tips | scissor action handles with a ratchet | 19 cm or 16 cm | 30 dollars |
| Luniatschek packer | a fine V notched tip at each end, one curved | knurled round handle | one size | 24 dollars |
Materials and finish
Every Heister 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 Heister mouth gag has a plain steel finish. Before each case, run the screw through its full travel. A thread that binds or turns rough should be cleaned and lubricated before use, and a bent jaw should be set aside.
Caring for it
Rinse the Heister mouth gag as soon as the case ends, before saliva dries in the thread. Open the jaws fully, brush the screw and the tips, wash it, dry it, and steam sterilize it on the normal cycle. A drop of instrument lubricant on the thread keeps the screw turning freely.
Ordering and wholesale
The Heister 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 Heister mouth gag used for?
It holds the mouth open with a stable, adjustable opening against the closing pull of the jaw, in oral and maxillofacial, dental and ENT surgery, in AI Mode’s words. Ours is screw action with straight jaws, at 45 dollars.
How does the Heister screw work?
Turning the broad thumb disc drives the screw, and the screw spreads the two jaws apart. Turned back, it closes them. The screw holds by itself at any point, so the opening can be set by a fraction of a turn and stays there.
Why choose a screw gag over a ratchet gag?
A screw holds any width and opens in very small steps, which suits a jaw that is stiff or clenched. A ratchet gag such as the Denhardt opens faster with a squeeze, but holds only at the steps of its ratchet.
Is a Heister jaw spreader the same instrument?
Yes. Gemini lists the Heister jaw spreader and the Heister screw mouth gag as catalog names for this pattern. All three describe the same two straight jaws spread by a screw, with a broad thumb disc to turn it.
Can it be autoclaved?
Yes. It is stainless steel with no coating, and it goes through the normal steam cycle with the rest of the tray. Open the jaws fully first so steam reaches the thread, then dry it and lubricate the screw now and then.
Related products and categories
Three more instruments from the same oral access tray: the Roser-Koenig mouth gag, the Luniatschek gauze packer and the Bruenings tongue depressor. The rest of the range is under maxillofacial instruments, which sits inside our ENT instruments.
| Weight | 0.2 kg |
|---|
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Processing Time: In-stock items are dispatched within 24-48 hours. For custom or out-of-stock items, production time is approximately 10-15 days.
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