Same Catalogue, Different Revision: A Fleet Continuity Schedule

A committee that says “match last year’s fleet” is not asking for a promise. It is asking for a reference: something in the file that states which table, at which revision, with which fittings, is the standard the new units will be measured against. That reference exists in three pieces, and a factory can produce all three before the order is placed. First, a unit file that ties the delivered machines to a nameplate revision and an as-built configuration list. Second, an interface and accessory list that proves last year’s pads, straps and clamps still fit. Third, a dated spare-part window that says how long the fleet can be kept running and when the last chance to buy a part falls. A purchase order that names the model but not the revision carries none of that. The sections below show where the two buying routes separate, and what to send the factory this week.

Two Ways to Buy the Same Table Again

There are only two practical ways to place a second order for a product already in service. One repeats the catalogue reference and trusts that the model name means the same machine. The other builds a small schedule that names the installed fleet as the standard. They cost about the same at the quotation stage. They behave very differently eighteen months later, when a revision letter has moved and the biomedical team is trying to work out whether the new units can share the accessory pool.

Catalogue Re-Order: Cheap Until the Revision Letter Moves

The catalogue route assumes a model name is a stable object. In practice a manufacturer can change a motor, a handset, a pad material or a supplier of a casting without changing the model name, because the name describes a product family and the revision letter describes the build. Hospitals discover this at the worst moment: the new table arrives, the old pads do not seat, and the reason is a rail or clamp change nobody was told about. The route is not wrong for consumables or for a fleet that is being replaced rather than extended. It is wrong whenever the new units have to live beside the old ones for years, share accessories, and be maintained by the same technicians with the same parts.

Continuity Schedule: Slower, and It Survives a Committee

The schedule route adds a document the factory has to sign, and it usually adds two weeks to the order. What it buys is a measurable definition. The committee can read which revision is being supplied, which serial numbers define the reference fleet, which fittings stay compatible, and how long parts will be available. When the answer is “the revision has moved”, the schedule forces that fact into the open before the deposit, which is the only point where the hospital can still change its mind at no cost. It also makes the second acceptance test comparable to the first, because both tests are drawn from the same document rather than from whatever the installer happens to check on the day.

What Continuity Covers That a Contract Clause Does Not

A general continuity clause says the supplier will not change the product without approval. That sentence is useful and it is also unenforceable on its own, because “the product” has no definition in it. For medical equipment the definition lives in three places, and each one is a document a hospital can ask for by name.

The Nameplate Is the Reference

Every unit carries a rating plate with a model, a revision or build standard, a serial number and a year. The schedule should quote the plate data of the installed fleet and require the new units to carry the same revision, or to list every difference in a signed table. This single step converts “same model” into a testable statement. It also gives the biomedical team a fast field check: the technician reads the plate on delivery and compares it with the schedule, instead of comparing two brochures. Where the revision has already moved, the table becomes the change notice, and the committee can decide whether the differences matter for their clinical use before the units ship.

Interfaces and Accessory Pool

The parts that break a fleet are rarely the big assemblies. They are the side-rail profile, the clamp that holds a support, the pad fixing, the handset cradle, the mounting pattern on a light or pendant. Ask the factory to list the interface dimensions and fixing methods that will not change, and to state which of last year’s accessories remain compatible. If an accessory is being discontinued, that belongs in the same table with the replacement and its fit. Our guide to freezing the electrical variant before the rest of the order makes the same point about plugs and supply: the small interface is what stops a fleet from being interchangeable.

The Spare Window Needs a Date

“We support the product for many years” is not a commitment a maintenance budget can be built on. Ask for a date, or a period counted from delivery, during which named spare parts will be available, and for the notice period before a part is withdrawn. Add the last-time-buy arrangement: how much notice the hospital gets, and whether the factory will hold a final stock. The same question applies to consumables and to the pad and strap range, because a table with no replacement pads is out of service for a trivial reason. Our article on spare parts planning for imported medical equipment covers how to turn that window into a stock decision.

Building the Schedule Before the Order

The schedule is one or two pages plus annexes. It is built once, then reused for every later order to the same factory, which is why the effort pays back on the third order rather than the first.

1. Collect the plate data of the installed fleet: model, revision, serial numbers, year of manufacture, and the accessories each unit was delivered with.
2. Ask the factory to confirm the revision that will be supplied against this order and to attach the as-built configuration list for it.
3. List every interface that has to stay compatible, with the accessory or attachment it serves, and require a fit statement for each.
4. Request the spare-part availability window with a date, the last-time-buy notice period, and the parts list it covers.
5. Fix the acceptance test for the second order so it repeats the first: same measurements, same conditions, same record columns.
6. Add the change-notification route: who at the factory writes to whom at the hospital, and how far ahead of shipment.

The acceptance item is the one buyers most often leave out. If the first fleet was accepted against a datasheet with stated measurement conditions, the second order should be accepted the same way, otherwise the two deliveries are not comparable and the committee’s question about matching cannot be answered with evidence. The measurement conditions behind three identical datasheets are the part worth copying into the schedule as an annex.

Questions the Committee Will Ask

Two questions come up in almost every repeat purchase, and both have a documentary answer rather than a verbal one.

Is This the Same Table or an Equivalent?

An equivalent is a different build that the supplier believes performs the same duty. That belief is not a continuity commitment. Ask the factory to answer in one of two ways: either the supplied units carry the same revision as the reference fleet, or a signed difference table names each change and its effect on interfaces, accessories, spare parts and the acceptance test. A factory that can produce the difference table is telling the truth about the change. A factory that answers “equivalent, no difference” without a document is asking the hospital to accept an opinion.

What Happens If the Revision Has Already Moved?

This is common, and it is not automatically a reason to walk away. The hospital needs three things: the difference table, the factory’s statement of which differences are invisible to clinical use, and a decision record showing that biomedical engineering accepted them. Where the change touches the certified configuration of the device, the manufacturer also has obligations to its own quality system and, in the EU, to the technical documentation and notified-body arrangements that sit under the medical device framework, which is why a change of this kind is dated and traceable rather than informal. The European Commission’s medical devices pages set out that framework. If the change is significant enough to require reassessment, the factory can say so, and the hospital can plan a re-acceptance instead of discovering the difference during a maintenance visit.

Closing Perspective

Continuity is not a clause, it is a file. The clause is the easy part to negotiate and the hardest part to use, because it depends on documents that only exist if someone asked for them at the right moment. The three annexes described here, the plate data, the interface list and the dated spare window, are all things the factory already holds. Getting them attached to the order is the whole job. Do it once and the second order stops being a negotiation about trust and becomes a comparison of two documents. The software baseline that keeps two lights on the same version is the same discipline applied to firmware, and the written scope of supply before the deposit is where the annex list should first appear. A committee that can point at a signed schedule stops asking whether the new units match, because the answer is already in the file.