Fomon Rasp, Flat and Convex Double Ended, Coarse or Fine
$ 32.00
The Fomon rasp in the flat and convex pattern is a double ended nasal rasp with a different SHAPE at each end rather than a different grit: one end is flat, for levelling the straight run of the bony dorsum, and the other is convex, for following a surface that curves away under it. Both ends cut on the draw stroke, and the instrument is ordered coarse or fine depending on whether it does the reduction or the finishing. Turning it over is quicker than changing instruments, which is why the double ended Fomon patterns have stayed on rhinoplasty trays.
Key Features
- Double ended: one flat face and one convex face on the same handle
- Two options: Coarse Reverse Cut and Fine Reverse Cut
- Both ends reverse cutting, so the working force runs back out of the nose
- Center grip handle, balanced the same whichever end is down
- Satin finish, no glare back into the field
- High quality medical grade stainless steel, fully autoclavable
- Three year replacement warranty against manufacturing defects
- Item code AO-16.75
What a Fomon rasp in the flat and convex pattern is
Most double ended rasps put two grits on one handle. This Fomon rasp puts two shapes on it. One end is flat and one end is convex, and the choice between them is about the surface in front of the surgeon rather than about how much bone has to come off.
The flat face is for the straight middle third of the dorsum, where it loads evenly across the bone. The convex face is for where the dorsum starts to fall away, at the shoulders of a hump or over the keystone, and a flat face on a curve like that touches at its two corners and nothing in between. Both faces cut on the draw.
Key design features
Flat at one end, convex at the other
A flat face and a curved surface do not get along: the face bridges the curve and loads on its corners, which is how a rasp leaves two parallel scratches instead of a smooth surface. A convex face sits into the hollow and contacts along its length. Having both on one handle means the surgeon can follow the dorsum from the root to the tip without stopping.
Both ends cut on the draw
Reverse cutting means the teeth lean forward and bone comes away as the instrument is pulled toward the surgeon. On a push the force runs along the nasal bones and up into the root, which is where a green stick fracture starts. On a draw it runs back out of the nose, and the surgeon feels resistance before anything moves. Both ends of this rasp are built that way deliberately.
Coarse or fine, and why it is one or the other
Because both ends are already committed to a shape, the coarseness is a single choice across the whole instrument. The coarse version reduces; the fine version dresses. A surgeon who does their own hump reduction usually wants both instruments on the tray, and a surgeon who only levels what an osteotome left wants the fine one.
The center grip
The handle sits in the middle and the two ends are matched in mass, so the instrument balances the same way whichever end is down. On a rasp that gets turned over several times in a case, that is the difference between one familiar instrument and two unfamiliar ones.
Which Fomon rasp to order
These two are this product’s own option list. Both carry the same flat and convex ends; the difference is how much bone each stroke takes.
| Option | What it does | Who orders it |
|---|---|---|
| Coarse Reverse Cut | Reduces. Takes a bony hump down and leaves a surface that needs dressing | Surgeons doing their own reduction with a rasp rather than an osteotome |
| Fine Reverse Cut | Dresses. Levels and smooths what a coarser instrument or an osteotome left | THE ONE TO ORDER IF YOU ARE ORDERING ONE, because most dorsal work ends with a fine pass |
| Both, on a working tray | Reduction and finishing with the same two shapes at each stage | A rhinoplasty list that runs weekly. The two instruments together cover the whole sequence |
Where it is used
It is a dorsal instrument, and the convex end widens where it can be used compared with a single flat rasp.
| Procedure | What the flat and convex Fomon rasp does there |
|---|---|
| Dorsal hump reduction | Flat end levels the straight run, convex end dresses the shoulders where the hump falls away |
| Septorhinoplasty | Levels the bony dorsum once the septal work is done |
| Keystone area contouring | The convex end earns its place here, on the curve where bone meets upper lateral cartilage |
| Lateral osteotomy | Smooths the cut margin so the mobilized bone lies flat rather than on a ridge |
| Nasal fracture reduction | Takes down a healed prominence, using whichever face matches the surface |
What it abrades, and what it must leave alone
A double ended rasp has an idle abrading face in the field at all times, which is the thing this table exists to say.
| Tissue | What this rasp does with it |
|---|---|
| Nasal bones and the bony dorsum | Removes. The working tissue for the flat end |
| The curved bone at the shoulders and the keystone | Removes. The reason the convex end is on the instrument |
| Bony septum and nasal spine | Removes, in short passes with the fine version. Thin bone and easy to overrun |
| Periosteum | MUST BE LEFT ALONE. Raise the flap first, and keep the idle end away from raised tissue |
| Upper lateral cartilage | Tears rather than cuts. Cartilage clogs the teeth and the face stops working, which is the signal to lift off |
How it compares with the other finishing surfaces
Against the other double ended patterns on this site, the question is whether the two ends should differ in shape or in grit.
| Instrument | What differs between its two ends | Where it belongs |
|---|---|---|
| Fomon rasp, flat and convex, as here | SHAPE. One flat face, one convex face, one coarseness | A dorsum that changes curvature along its length, which is most of them |
| Fomon nasal raspatory, carbide | GRIT. Two coarsenesses of carbide on one handle | Reduction and finishing in one instrument, on a list where the rasp is used weekly |
| A single ended nasal rasp | Nothing. One face, one job | A tray that already carries several rasps and does not need a compromise |
| A diamond coated rasp | Nothing, but the face is far finer than anything here | The last pass under thin skin, after this instrument has done the levelling |
Materials and finish
Every Fomon rasp we make is cut from high quality medical grade stainless steel. The steel itself is made to a German specification. We do not publish a grade number, because the number on a certificate tells a surgeon nothing about how an abrasive face holds up after fifty autoclave cycles, and the answer to that is in the finish rather than in the alloy.
The teeth are machined into both faces rather than applied to them, so nothing is bonded that can shed and nothing plated that can chip. The coarse end wears faster than the fine end simply because it does more work, which is normal on a double ended instrument. A rasp that tears instead of cutting has reached the end of its working life.
Caring for it
Rinse it before the case is cleared and clean both ends, even the one that did not work. Bone dust packs between machined teeth and sets, and a packed face cuts like a smooth one, which is how a good rasp gets thrown out early.
Brush along the teeth with a soft nylon brush, in the direction they lean, never against them and never with wire. Enzymatic cleaner, ultrasonic cycle, deionized water rinse, dry fully, autoclave at 134 degrees Celsius. Lay it in a rack rather than a pile, so neither face rests against another instrument.
Ordering and wholesale
The Fomon rasp in the flat and convex pattern is made in our own workshop and sold direct, which is why the price sits where it does against the catalogue houses. Order one for a single set, or in quantity for a hospital list or a distributor line; we do OEM work under your own brand and your own item numbers, and we will hold a run to your pattern rather than ours if you send a sample. 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 nose rasping surgery used for?
Reshaping the bony part of the nose. A rasp files the nasal bones down a fraction of a millimeter at a time, which is how a dorsal hump is levelled and how the bone is smoothed after it has been cut. It is the finishing work of a rhinoplasty rather than the cutting work.
What is the difference between the flat end and the convex end?
The surface each one fits. A flat face loads evenly on the straight middle third of the dorsum. A convex face sits into a curve, at the shoulders of a hump or over the keystone, where a flat face would bridge across and touch only at its corners.
Should I order the coarse or the fine Fomon rasp?
Fine, if you are ordering one. Most dorsal work ends with a fine pass, and the coarse version is for surgeons who reduce the hump with a rasp rather than with an osteotome. A weekly rhinoplasty list usually carries both.
What surgical tools are used in rhinoplasty?
Osteotomes and saws to cut bone, elevators to raise the soft tissue envelope, retractors to hold it open, scissors and knives for the cartilage, and rasps to level and smooth what the cutting instruments left. This rasp belongs to that last group, which is the one that decides what the nose looks like through the skin.
Is this the same as the Fomon nasal raspatory?
No, and the two are easy to mix up because both are double ended Fomon patterns. This one has two SHAPES, flat and convex, in one coarseness. The raspatory has two GRITS of tungsten carbide and a raspatory shank for lifting the periosteum. Different item codes and different jobs.
Related products and categories
The rest of the double ended and carbide group: Gallaher bone and nasal rasp with finger ring where the stroke needs a finger ring behind it, Dingman cartilage abrader for the cartilage graft that sits on the dorsum this rasp levels, and McIndoe nasal rasp in tungsten carbide when the face has to hold its bite for years rather than cases.
The full range is in raspatories and saws, and the tray this belongs to is in rhinoplasty instruments.
| Weight | 0.09 kg |
|---|---|
| Tip options | Coarse Reverse Cut, Fine Reverse Cut |
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