Surgical Instrument Stringer: Types, Uses and How to Choose the Right One
A hemostat can look clean and still hold soil in its box lock. Whether that hinge is exposed or shielded often comes down to one steel bar. That bar is a surgical instrument stringer.
Most clinics buy stringers without much thought. Then a set comes back with stiff hinges or visible residue, and the question starts: were the instruments really open?
This article explains what a stringer does, the main types, how to pick the right width, and how to load one.
What Is a Surgical Instrument Stringer?
A surgical instrument stringer is a metal bar that threads through the finger rings of hinged instruments. It holds them open during washing and sterilization, so cleaning solution and steam can reach every surface. Most are U-shaped or D-shaped with a lock at one end.
Stringers suit ring-handled instruments such as hemostats, needle holders, scissors, and forceps. Instruments without rings need something else. STERIS, for example, points to band clamps for those.
Who uses them? Any team that reprocesses hinged instruments in-house. That includes hospital sterile processing departments, ambulatory surgery centers, dental and oral surgery offices, and outpatient clinics. Smaller practices sometimes skip stringers because their trays are short. The open-hinge guidance still applies to a tray of six instruments, just as it does to a tray of sixty.
Why Hinged Instruments Must Stay Open
The box lock is the hinge where two halves meet. It is hard to clean. Soil can sit in the joint, and a closed hinge blocks both detergent and steam.
The CDC’s Guideline for Disinfection and Sterilization in Healthcare Facilities is clear on this. It says hinged instruments should be opened, and loads must let steam circulate around each item. The same guideline says hinged instruments should be fully opened in a washer-disinfector so detergent can make contact.
Closing the ratchet has a mechanical cost too. One manufacturer’s care guide warns that processing needle holders and forceps with the ratchet closed may crack box locks and hinges.
Cleaning is also never perfect, which is why exposure matters. A study in the Journal of Hospital Infection measured residual protein on 120 reprocessed instruments from five NHS sterile service departments. Median levels per tray set ranged from 163 to 756 μg per instrument.
The stakes are real. The World Health Organization reports that 11% of patients who have surgery in low- and middle-income countries develop an infection. No study ties stringers alone to lower infection rates. But they are a simple tool that helps teams keep instruments open, as the guidance asks.
Types of Instrument Stringers
Names vary by maker. These are the styles you will see most often.
| Type | How it works | Good fit for |
| U-shaped (hairpin) | Open-ended bar that spreads instruments apart | Organizing ring-handled instruments and holding them steady during washing |
| Spring lock | Spring male and female ends snap together | A secure closing: one maker lists 2.5-inch widths in lengths from 6 to 16 inches |
| Pin lock | Double-hinged bar joined at the middle by a male and female closure | Trays where a firm closure matters |
| Center lock | Lock sits at the center of the bar | General tray sets |
| Adjustable | Width and length can be set to fit | Teams that want one stringer for prep and washing |
Other styles, such as pull-to-open, ball-and-socket and T-bar, also exist. Check each product page and the instructions for use (IFU) before you buy.
How to Choose the Right Width and Length
Start with width. According to Healthmark, stringers for sterilization prep are usually 2 to 3 inches wide. Stringers for washing are often 5 to 6 inches wide, which opens instruments further to the washer spray. That split once meant buying two sets of stringers. An adjustable model solves it by changing width on the same bar.
Next, check length. Match it to the number of instruments, then test the fit in your tray. Catalogs run from about 4 to 20 inches, so there is room to match your sets.
Here is a simple way to think about it. If your team washes and sterilizes with the same stringers, an adjustable model keeps inventory small. If you run separate prep and wash stations, fixed-width stringers for each station may be easier to track.
Look for stainless steel with finished edges. Smooth edges keep handling safer for the people loading trays.
How to Load an Instrument Stringer
- Clean first: Sterilization does not replace cleaning. Leftover soil can shield microbes from the process.
- Open each instrument: Release the ratchet so the hinge is fully open.
- Group by type: Keep similar instruments together on the bar.
- Thread the rings: Slide the finger rings onto the stringer.
- Lock the stringer: Check that it holds before you move it.
- Place it in the tray: Do not overload. Steam needs space to move.
- Follow the IFU: Use the instrument and tray maker’s directions.
Common Mistakes to Avoid
- Loading instruments with the ratchet closed
- Overloading one stringer or the whole tray
- Mixing different metals in ultrasonic baths, which can cause pitting and etching
- Reusing a bent, rusty or loose-locking stringer
Two related tools are worth knowing. Band clamps hold instruments that have no rings. A wash cradle, such as the one Healthmark sells, holds hinged instruments open in automated washers.
What to Check Before You Buy
- Width for your workflow: prep, washing, or both
- A lock that works easily with gloved hands
- Length that fits your tray
- Stainless steel with finished edges
- The maker’s IFU, including cleaning and sterilization guidance
- Enough stringers for every set
If you are building or restocking instrument sets, Next Edge Surgical LLC supplies dental and surgical instruments from Salt Lake City, Utah. It is a useful contact when you want everything for a set lined up in one place.
FAQs
What is a surgical instrument stringer used for?
It keeps hinged, ring-handled instruments open during cleaning and sterilization. That lets detergent and steam reach the box lock and other joints.
Why must hinged instruments be sterilized open?
A closed hinge shields its inner surfaces. The CDC guideline says hinged instruments should be opened and steam should circulate freely around every item.
What size instrument stringer do I need?
Match width to the job: about 2 to 3 inches for sterilization prep and 5 to 6 inches for washing. Pick a length that fits your instruments and tray. An adjustable stringer can cover both widths.
How do you put instruments on a stringer?
Clean them first, open each one, and release the ratchet. Thread the finger rings onto the bar, lock it, and place it in the tray without overloading.
Conclusion
A stringer is a small tool with a clear job. It keeps hinges open so cleaning and sterilization can reach them. Pick the right width, load it correctly, and follow the maker’s IFU. For help sourcing instruments for your sets, visit Next Edge Surgical LLC
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