Product pages are written to tell you what a device can do. Two paragraphs buried in the instructions for use are written to tell you something else entirely: what the device was actually assessed for, and where it should not be used. They’re rarely on the product page, and they’re usually more informative than everything that is.
An intended-use statement defines what a device was designed and assessed to do; contraindications define the circumstances in which it should not be used at all. For a registered medical device both are required parts of the documentation, and both are written under regulatory scrutiny rather than marketing pressure — which is why they tend to be narrower, more specific, and more honest than anything on a product page. The intended-use statement typically names the parameter being monitored, the population it applies to (an age range, for instance), and the setting (home, clinical). Contraindications then exclude specific situations — and in infant monitoring, such statements commonly exclude infants with known breathing difficulties and exclude use for preventing SIDS, which are precisely the uses a worried parent might most readily assume. Consumer-positioned products aren’t required to publish either paragraph; their closest equivalent is a disclaimer, which is worth reading just as carefully. The practical habit: before relying on any monitoring feature, find the document that says what it’s for and what it isn’t — not the one that says what it can do.
§01Why these paragraphs are different from everything else
Almost every piece of text associated with a consumer product is written to persuade. The instructions-for-use document of a registered medical device contains sections written for a different reader: a regulator or assessor who will check them against the evidence submitted.
That changes the incentive completely. A marketing page benefits from being broad; an intended-use statement that overreaches the evidence is a problem during assessment. A product page benefits from leaving limitations unstated; contraindications exist specifically to state them. The result is a pair of paragraphs that describe the device the way the evidence supports rather than the way the market would prefer.
§02The four sections worth finding
Documentation varies by jurisdiction and device, but these four sections — or close equivalents — recur. The examples below are constructed to illustrate typical structure, not drawn from any real product.
A short statement of what the device is for. It usually specifies three things: what is measured or monitored, in whom, and where. Every word narrows the scope, and the narrowing is deliberate.
Typical structure“Intended to monitor [parameter] in infants aged [range] while asleep in a cot, in the home environment, by lay caregivers.” HOW TO READ IT: anything not named is outside scope. An age range excludes other ages; a setting excludes other settings; a named parameter excludes parameters the product page might imply.Who operates the device and who it’s used on. Often folded into the intended-use statement, sometimes separate. It matters because a device assessed for use by lay caregivers at home was assessed against that context — not against a clinical setting, and not against infants outside the stated population.
Typical structure“Intended users: infant caregivers in the home environment. Patient population: healthy infants within the stated age range.” HOW TO READ IT: the word “healthy,” where it appears, is doing a great deal of work — it defines who the device was not assessed for.The circumstances in which the device should not be used. This is the most specific statement of limits a device will ever carry, because it’s required to be explicit rather than implied.
Typical structure“Contraindicated for infants with known breathing difficulties. Contraindicated for monitoring for the prevention of SIDS.”In infant monitoring, exclusions of this kind are common — and they rule out exactly the uses a buyer might most assume. A device that is contraindicated for infants with breathing difficulties is not intended for the babies whose parents might be most motivated to buy a breathing monitor. That’s not a contradiction; it’s the evidence talking.
HOW TO READ IT: contraindications override everything else in the document. If your situation appears here, nothing on the product page changes that.Less absolute than contraindications, but often more practically useful: known failure modes, conditions that affect accuracy, and statements about false positives and false negatives. A document that acknowledges both kinds of error is describing a real device honestly; one that mentions neither hasn’t told you how it fails.
Typical structure“False positive or false negative readings are possible. Accuracy may be affected by [conditions]. Not a substitute for adult supervision.” HOW TO READ IT: this is where the device describes its own reliability boundaries. It’s the section most worth reading twice.FIG.01 — Each layer narrows the one above it. The product page describes capability; the documentation describes the assessed scope and then carves exclusions out of it. Reading only the top layer means missing both narrowings.
§03Contraindication, warning, precaution, disclaimer
Four words that appear in device documentation with different strengths. Worth distinguishing, because they’re easy to read as equivalent.
| Term | What it means | How strong |
|---|---|---|
| CONTRAINDICATION | A situation in which the device should not be used at all | Absolute — excludes the situation entirely |
| WARNING | A risk of serious harm that the user needs to know about | Strong — describes a hazard, not an exclusion |
| PRECAUTION | Something to do or avoid to use the device safely and effectively | Moderate — operational guidance |
| DISCLAIMER | A statement of what the product is not — typical on consumer-positioned devices | Scope-defining — tells you what regulatory category it’s outside |
TABLE.01 — The first three appear in medical device documentation; the fourth is where consumer products put the equivalent information. A disclaimer isn’t weaker than a contraindication in what it tells you — it’s telling you something different: that no assessment of the kind described in §02 took place.
§04Reading a consumer disclaimer
A consumer-positioned product has no intended-use statement in the regulatory sense and no contraindications. What it frequently has instead is a disclaimer — and disclaimers repay careful reading, because they’re often the most precise sentence on the page.
A typical disclaimer states that the product is not a medical device and is not intended to diagnose, treat, cure or prevent any disease or condition, often naming SIDS specifically, and sometimes acknowledging that false readings are possible. Each clause is informative. “Not a medical device” tells you no regulator assessed it for a medical purpose. “Not intended to prevent” tells you the manufacturer is not claiming it protects against the named condition. An acknowledgement of false readings tells you the manufacturer knows the feature is fallible.
The useful exercise is to place the disclaimer next to the headline. Where the headline suggests protection and the disclaimer disclaims it, the disclaimer is the accurate one — it’s the sentence written with legal exposure in mind. The language patterns that create that gap are covered in the health-claim language article.
§05Where to find these documents
§06What our own products’ intended use is
Our monitors aren’t medical devices, so they carry no intended-use statement in the regulatory sense and no contraindications. But the question is still worth answering plainly, because it’s the right question to ask of any product.
Stated in one sentence: our monitors are intended to let a caregiver see and hear a room remotely, over a dedicated FHSS link, with no internet connection. They provide video, audio, infrared night vision, two-way talk and an ambient room temperature reading. They are not intended to measure any vital sign, detect any medical condition, or reduce the risk of any condition, and they are not a substitute for supervision. If that sentence would be less reassuring than a product page, it’s because it describes the device accurately. Specifications are on the product pages.
§07Questions worth asking
- What is the stated intended use — parameter, population, setting — in the manufacturer’s own documentation?
- Are there contraindications, and does my situation appear among them?
- Does the documentation acknowledge false positives and false negatives, or mention neither?
- Is the product positioned as a medical device or not in my market — and if not, what does the disclaimer actually say?
- Does the headline claim fit inside the intended use, or does it reach beyond it?
- Is the document I’m reading for the version sold in my country?
§08Frequently asked questions
What is an intended-use statement?
A short statement in a device’s documentation defining what it was designed and assessed to do. For a registered medical device it typically specifies what is measured or monitored, in which population, and in which setting — for example, a parameter, an age range, and home use by lay caregivers. Because it’s written for regulatory assessment rather than marketing, it’s usually narrower and more precise than a product page, and anything not named in it falls outside the device’s assessed scope.
What are contraindications on a medical device?
Circumstances in which the device should not be used at all. They’re the most specific statement of limits a device carries, because documentation is required to state them explicitly. In infant monitoring, contraindications commonly exclude infants with known breathing difficulties and exclude use for preventing SIDS — which rules out precisely the uses a buyer might most readily assume. Contraindications override everything else in the documentation: if a situation appears there, nothing on the product page changes it.
What’s the difference between a contraindication and a warning?
A contraindication excludes a situation entirely — the device should not be used there. A warning describes a risk of serious harm the user needs to know about, without excluding use. A precaution is operational guidance for using the device safely and effectively. And a disclaimer, typical of consumer-positioned products, states what the product is not — usually that it isn’t a medical device and isn’t intended to diagnose or prevent any condition. Each carries different information.
Why don’t consumer baby monitors have contraindications?
Because they aren’t medical devices, so they aren’t assessed against a medical intended use and aren’t required to publish one or to state contraindications. Their closest equivalent is a disclaimer, which typically states the product is not a medical device and not intended to diagnose, treat or prevent any condition. That disclaimer is worth reading as carefully as a contraindication — where a headline suggests protection and the disclaimer disclaims it, the disclaimer is the sentence written with legal exposure in mind.
Where can I find a device’s intended use and contraindications?
Instructions for use are frequently published online as PDFs, often on manufacturers’ support sites. For US-cleared devices, public regulatory database entries include a stated indication for use. On product pages, disclaimers are commonly placed in small print at the foot of the page. And asking the manufacturer directly works: any maker of a regulated device should be able to state the intended use and any contraindications in a sentence. Check that the documentation is for the version sold in your market, since it can differ by country.
What is the intended use of True Bond monitors?
Our monitors aren’t medical devices, so they have no intended-use statement in the regulatory sense and no contraindications. Stated plainly: they’re intended to let a caregiver see and hear a room remotely over a dedicated FHSS link with no internet connection, providing video, audio, infrared night vision, two-way talk and an ambient room temperature reading. They’re not intended to measure any vital sign, detect or reduce the risk of any medical condition, or substitute for supervision.
Ask us for the one-sentence version
What our products are for, and what they aren’t — stated as plainly as an intended-use statement would require. It’s the right question to ask any manufacturer, including us.
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