5.2 Distribution Systems

Distribution: The Final Step

Distribution is the last stage of the sterile-processing workflow, getting the right supplies to the right place at the right time while protecting the sterile barrier. The model a facility chooses depends on volume, predictability, and how customized the supply mix must be.

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The Four Distribution Systems

1. Case Cart System

The dominant model for surgical supply. A cart is assembled for each specific case from the surgeon's preference card (the documented list of instruments and supplies a surgeon wants for a given procedure).

• Contains sterile instrument trays, disposables, sutures, drapes, gowns, gloves, and specialty items.
• Usually built the evening before surgery and staged in a clean holding area.
• Verified against the preference card and pick list, then delivered to the operating room (OR) and checked by the team.

Advantages: customization reduces waste and forgotten items, supports advance planning, and centralizes everything for one case.

2. Exchange Cart System

A full pre-stocked cart replaces a depleted cart on the unit; CS returns the empty cart to a standard level. Efficient for high-volume, standardized supply areas because the swap is fast and the count is predictable.

3. PAR-Level System

Each storage location has a Periodic Automatic Replenishment (PAR) level, a fixed maximum quantity per item. A technician counts on a schedule and refills up to PAR. Levels are set from usage history and adjusted for seasonality and procedure volume.

4. Requisition System

Departments request specific items as needed. Least proactive, but ideal for infrequently used or specialty items where pre-stocking would waste shelf space.

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Choosing a System

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FIFO Rotation (First-In, First-Out)

FIFO ensures the oldest sterilized items are issued first:

• When restocking, place newer items behind older ones.
• Check sterilization or load dates during restocking.
• Reduces packaging degradation over time, important even under event-related sterility.
• Essential where time-related expiration dates are in force.

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Transport of Sterile Items

• Use covered or enclosed carts; never transport open sterile packages.
• Protect packages from moisture, crushing, and puncture.
• Inspect at receipt; reject any package with a compromised barrier and return it for reprocessing.
• Keep transport time and handling to a minimum.

Clean vs. Soiled Traffic

• Never transport sterile and contaminated items together in the same cart or elevator load.
• Route sterile items away from soiled corridors and the decontamination area.
• In facilities with clean and soiled elevators, sterile loads use the clean path; cover items moving through public corridors.

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Supply-Chain Models You Must Know

Scenario: A trauma case needs an implant set the facility rarely uses. Under consignment, the implants already sit in CS, owned by the vendor, and are charged only when opened, so the case proceeds without a costly outright purchase.

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Common Exam Traps

• The case cart benchmark is 99 percent, not 100 percent; perfect accuracy is the aim, but under-1-percent error is the accepted standard.
• FIFO means newest-behind, oldest-first; do not confuse it with placing new items in front.
• Consignment stock is supplier-owned until used, distinct from outright purchase or vendor-managed systems.

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Documentation and Traceability

Every distribution event should be recorded so a specific tray or lot can be traced from CS to the patient. At minimum the record captures what was sent, where, when, and by whom. For instrument trays, the load number ties the tray to its sterilization cycle and the biological indicator result for that load. This chain is what lets a department respond to a failed indicator or a recall by pulling exactly the affected items rather than quarantining everything.

Key points technicians should be able to apply:

• A case cart that arrives with a wet outer wrapper or a torn pouch is rejected at the point of receipt, documented, and the item is reprocessed.
• If a load's biological indicator later fails, distribution records identify which patients and rooms received items from that load.
• Counts on returned exchange carts feed back into PAR adjustments, linking distribution data to inventory decisions.

Coordinating With the Operating Room

Distribution succeeds or fails on communication with the OR. Preference cards drift out of date as surgeons change technique, so periodic review with the OR keeps case carts accurate and prevents the most common defect, a missing or wrong item. Add-on and emergency cases break the planned schedule; CS must be able to build or supplement a cart quickly, which is why fast-access specialty and implant stock often lives near the case-cart staging area.

When a case is delayed or cancelled, the cart returns to CS. Unopened sterile items with intact barriers can be restocked, while opened or compromised items are reprocessed or discarded. Treating a returned cart as automatically clean is a common error, each package is inspected before it goes back on the shelf.