Medical Instrument Cleaning

The main difficulty is removing oil, carbon, scale, biofilm, process residue, and particles from bores, channels, tubes, hoses, ports, and internal passages without damaging the surface, loading the brush, or carrying contamination back into the process.

The work happens in wet indoor area and cleanroom against tissue residue, protein and disinfectant residue.

The part people get wrong: the residue tells you the filament, but the access opening tells you the construction. Get them in that order and the shortlist is short.

5 targets, each with its own opening, residue and contact requirement.

What the equipment leaves you to work inside:

Single- or double-ended channel brush, valve brush, external instrument brush or model-specific cleaning tool.

How the brush is usually carried on the machine:

• Driven brush — use when oil, carbon, scale, biofilm, process residue, and particles needs repeatable scrubbing or controlled relative movement
• Passive or free-running brush — use for loose contamination and lower process complexity on bores, channels, tubes, hoses, ports, and internal passages
• Localized hand, strip, or tube brush — use where only an edge, gap, port, or maintenance point needs contact

In practical brush terms: match the construction to the access before anything else. A geometry that cannot reach the target will not be rescued by a better filament.

Medical-reprocessing-grade nylon/PBT or approved wire/abrasive only when the instrument IFU permits it; documented stem and handle materials.

What the duty rules out before you start comparing grades:

The IFU comes first: it fixes the channel diameter, the permitted materials, and whether a brush may be used. Everything else follows from it.

Work through it in this order:

1. Identify the target part and measure the access opening or clearance
2. Describe the residue: what it is, how thick it sits, and how strongly it holds
3. Choose the construction that can physically reach that target
4. Set the filament from surface risk, working temperature and cleaning chemistry
5. Fix filament diameter, free trim length and density for the contact pressure you need
6. Run one cycle and check the result before committing to a production quantity

Before you commit to a quantity, send the channel diameter and length for each instrument, together with the relevant page of the IFU.

Washer-disinfectors and ultrasonic cleaning deliver a validated, recordable result that manual brushing cannot claim. If the IFU does not authorise a brush on that channel or that surface, the brush is out of scope no matter how well it would work.

• Selecting a brush before reading the device IFU, which is what actually authorises the size and the material
• Changing brush material while leaving excessive engagement, poor alignment, or no discharge path unchanged
• Copying a worn brush without recording motion, direction, mounting, and the original working diameter

If the brush is already in service and the result is wrong, work from the symptom: