INVACARE CHECK O2 PLUS CONCENTRATOR ANALYZER (CHECK O2 PLUS)
Applicant
Invacare Corp.
Product Code
CCL · Anesthesiology
Decision Date
Jul 9, 1999
Decision
SESE
Submission Type
Traditional
Regulation
21 CFR 868.1720
Device Class
Class 2
Indications for Use
The Invacare Check O2 Concentrator Analyzer device is a tool for use by service personnel to evaluate the output of an oxygen concentrator. Its intended use is to provide information to the service technician regarding oxygen content, flow rate, and pressure, of oxygen produced by an oxygen concentrator. It is not intended to be used by patients who are prescribed oxygen, nor is it intended to continuously monitor or confirm oxygen delivery to patient. Intended Environment: The Check O2 is intended to be used in an environment where Oxygen Concentrators are serviced or repaired. This includes Hospitals, Nursing Homes, Extended Care Facilities, Patient Homes and Respiratory Device Service and Repair Centers.
Device Story
Battery-powered, standalone oxygen analyzer; measures oxygen concentration, flow, and pressure from oxygen concentrators. Input: gas from concentrator via standard therapy tubing. Principle: ultrasonic technology measures gas density to determine oxygen concentration. Output: digital display of concentration, flow, and pressure. Used by service technicians in hospitals, nursing homes, and repair centers to verify concentrator performance. Not for patient use; not for continuous monitoring. Benefits: provides service personnel with diagnostic data to ensure concentrator output meets specifications.
Clinical Evidence
Bench testing only. Device tested for electrical, mechanical, and environmental performance requirements per 1993 FDA Reviewer Guidance for home use respiratory devices. Met all performance criteria.
Technological Characteristics
Ultrasonic sensor for oxygen concentration; battery-powered; standalone; dimensions/form factor not specified. Measures concentration (73-95.6%), flow (0-6 LPM), and pressure (0-10 PSI). Operating range +10 to +35 degrees Celsius. Dry indoor environment use only.
Indications for Use
Indicated for use by service personnel to evaluate oxygen concentrator output (oxygen concentration, flow rate, and pressure). Not for patient use or continuous monitoring of oxygen delivery.
Regulatory Classification
Identification
An oxygen gas analyzer is a device intended to measure the concentration of oxygen in respiratory gases by techniques such as mass spectrometry, polarography, thermal conductivity, or gas chromatography. This generic type of device also includes paramagnetic analyzers.
{0}------------------------------------------------
JUL - 9 1999
K984295
# 510(k) SUMMARY (Revised 4/15/99)
# Invacare Corporation's CHECK O2 PLUS OXYGEN ANALYZER
# Submitter's Name, Address, Telephone Number, Contact Person and Date Prepared.
Invacare Corporation One Invacare Way P.O. Box 4028 Elyria, Ohio 44036-2125 Phone: (440) 329-6000 Facsimile: (440) 365-4558
Contact Person: Edward A. Kroll Director , TQM and Regulatory Affairs
Date Prepared: November 30, 1998
# Name of Device and Name/Address of Sponsor
Invacare Corporation One Invacare Way P.O. Box 4028 Elyria, Ohio 44036-2125 Phone: (440) 329-6000 Facsimile: (440) 365-4558
### Common or Usual Name
Oxygen Analyzer
### Classification Name
Oxygen Gas Analyzer
### Predicate Devices
The Invacare Check O2 Plus is substantially equivalent to the Puritan Bennett Corporations' Model "Companion ROCI (K920338)."
{1}------------------------------------------------
## Intended Use
The Invacare Check O2 Concentrator Analyzer device is a tool for use by service personnel to evaluate the output of an oxygen concentrator. Its intended use is to provide information to the service technician regarding oxygen content, flow rate, and pressure, of oxygen produced by an oxygen concentrator. It is not intended to be used by patients who are prescribed oxygen, nor is it intended to continuously monitor or confirm oxygen delivery to patient.
Intended Environment: The Check O2 is intended to be used in an environment where Oxygen Concentrators are serviced or repaired. This includes Hospitals, Nursing Homes, Extended Care Facilities, Patient Homes and Respiratory Device Service and Repair Centers.
# Technological Characteristics and Substantial Equivalence
### A. Device Description
The Invacare Check O2 Plus is a lightweight, battery powered device which measures oxygen gas concentration, flow and pressure from an oxygen concentrator. The device is a standalone product and does not have any accessories, power supply adapters or fittings. This device is intended as a tool for use by oxygen concentrator service personnel, to evaluate the output of an oxygen concentrator. It is not intended to be used by patients who are prescribed oxygen, nor is it intended to continuously monitor or confirm delivery of oxygen to a patient.
The device connects to an oxygen concentrator through existing therapy tubing presently in use throughout the industry. The device is designed and calibrated for use only on the species mixture inherent with the output flow of a concentrator. Information provided is the concentrator's oxygen concentration, flow and pressure. Continuous monitoring of output gas flow between an operating concentrator and a patient is not possible. Use with any downstream devices or patient accessories is also not possible.
It is further intended that this device be used on clean, dry and unhumidified concentrator output In conjunction with the operating temperature of oxygen concentrators, the ambient gas. temperature range of the Check O2 Plus is within the range of +10 to +35 degrees Celsius and should remain in a dry indoor environment.
The concentrator gas is expected to fall within the following ranges and will be measured with the accuracy's listed below.
| Concentration: | 73% to 95.6% oxygen, ± 2% |
|----------------|------------------------------------------------------------------|
| Flow: | 0 to 6 Liters per minute, ± 0.3 L/M (5% of full scale) ± 1 digit |
| Pressure: | 0 to 10 PSI, ± 2% full scale |
| | 0 to 68.95 kPa, ± 2% full scale |
{2}------------------------------------------------
# A. Substantial Equivalence
The Invacare Check O2 Plus covered by this substantially equivalent to other legally marketed oxygen analyzer devices. Specifically, the Invacare Check O2 Plus is substantially equivalent to the Puritan Bennett Corporations' Model "Companion ROCI" (K920338 8/27/92). The Invacare Check O2 Plus is comparable this device in several aspects.
The Invacare Check O2 Plus has the same intended use, principle of operation and technological characteristics. Both devices are battery powered and have similar performance characteristics, features and specifications for accuracy of measured output. Finally, both sensors utilize ultrasonic technology for measuring oxygen concentration. This is a proven technique for measuring oxygen concentration as a function of gas density.
The Check O2 Plus differs from its predicate device in that it has the capability of measuring pressure and flow, as well as oxygen content. As such it is a more complete tool for use in analyzing concentrator output and measuring concentrator performance. Additionally, the Check O2 Plus device measures oxygen content within the range of < 73% to 95.6%, while the predicate device measure oxygen concentrator output in the ≤ 70 to < 85% range.
The Invacare Check O2 Plus differs from the Puritan Bennett device in that the Puritan Bennett device is designed as an optional retrofittable upgrade for an oxygen concentrator, that continuously monitors oxygen content, and informs the concentrator user whether oxygen purity is within acceptable ranges. This differs from the Invacare device, which is intended only as a tool for measuring concentrator output performance, and not as a means of continuously monitoring oxygen purity levels.
Although there are some differences between the Check O2 and its predicate device, these differences are minor and raise no new questions of safety and effectiveness. We believe, therefore, that the Invacare Check O2 Plus is substantially equivalent to the predicate device referenced in this submission, and trust that the information provided will be sufficient to enable FDA to find the Invacare Check O2 Plus substantially equivalent to the predicate device,
# Performance Data
The Invacare Check O2 Plus was tested in accordance with the electrical, mechanical and environmental performance requirements for home use respiratory devices set forth in the Anesthesiology and Respiratory Devices Branch's November 1993 document entitled "Reviewer Guidance for Premarket Notification Submissions". In all instances the Check O2 Plus met the required performance criteria and functioned as intended.
{3}------------------------------------------------
Image /page/3/Picture/1 description: The image is a black and white seal for the Department of Health & Human Services - USA. The seal is circular with the text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" around the perimeter. In the center of the seal is a stylized image of three human profiles facing to the right, with three curved lines above them.
Public Health Service
Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850
JUL - 9 1999
Mr. Edward A. Kroll Invacare Corporation One Invacare Way P.O. Box 4028 Elyria, OH 44036-2125
Re: K984295 Invacare Corporation's Model Check 02 Plus Concentrator Analyzer Requlatory Class: II (two) Product Code: 73 CCL Dated: April 15, 1999 Received: April 19, 1999
Dear Mr. Kroll:
We have reviewed your Section 510(k) notification of intent to market the device referenced above and we have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to legally marketed predicate devices marketed in interstate commerce prior to May 28, 1976, the enactment date of the Medical Device Amendments, or to devices that have been reclassified in accordance with the provisions of the Federal Food, Druq, and Cosmetic Act (Act). You may, therefore, market the device, subject to the general controls provisions of the Act. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration.
If your device is classified (see above) into either class II (Special Controls) or class III (Premarket Approval), it may be subject to such additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 895. A substantially equivalent determination assumes compliance with the Current Good Manufacturing Practice requirements, as set forth in the Quality System Regulation (QS) for Medical Devices: General regulation (21 CFR Part 820) and that, through periodic QS inspections, the Food and Druq Administration (FDA) will verify such assumptions. Failure to comply with the GMP regulation may result in regulatory action. In addition, FDA may publish further announcements concerning your device in the Federal Register. Please note: this response to your premarket notification submission does not affect any obligation you might have under sections 531 through 542 of the Act for devices under the Electronic Product Radiation Control provisions, or other Federal laws or regulations.
{4}------------------------------------------------
#### Page 2 - Mr. Edward A. Kroll
This letter will allow you to begin marketing your device as described in your 510(k) premarket notification. The FDA finding of substantial equivalence of your device to a legally marketed predicate device results in a classification for your device and thus, permits your device to proceed to the market.
If you desire specific advice for your device on our labeling regulation (21 CFR Part 801 and additionally 809.10 for in vitro diagnostic devices), please contact the Office of Compliance at (301) 594-4648. Additionally, for questions on the promotion and advertising of your device, please contact the Office of Compliance at (301) 594-4639. Also, please note the regulation entitled, "Misbranding by reference to premarket notification"(21 CFR 807.97). Other general information on your responsibilities under the Act may be obtained from the Division of Small Manufacturers Assistance at its toll-free number (800) 638-2041 or (301) 443-6597, or at its internet address "http://www.fda.gov/cdrh/dsma/dsmamain.html".
Sincerely yours,
Thomas J. Callahan
Thomas J. Callahan, Director Division of Cardiovascular, Respiratory, and Neurological Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
{5}------------------------------------------------
## 510(k) Number (if known): K984295 (Revised 4/15/99)
Device Name: Invacare Check O2 Concentrator Analyzer
#### Indications For Use:
The Invacare Check O2 Concentrator Analyzer device is a tool for use by service personnel to evaluate the output of an oxygen concentrator. Its intended use is to provide information to the service technician regarding oxygen content, flow rate, and pressure, of oxygen produced by an oxygen concentrator. It is not intended to be used by patients who are prescribed oxygen, nor is it intended to continuously monitor or confirm oxygen delivery to patient.
The Check O2 has measurement capability in the following ranges: 73% - 95.6% Oxygen Concentration 0 - 6 LPM Flow 0 - 10 PSI Pressure
Accuracy of the Device is:
± 2% Oxygen Concentration ± .3 LM Flow (5% of full scale) ± 1 digit ± 2 PSI Full Scale Pressure 0 to 68.95 kPa, ± 2% Full Scale
Intended Environment: The Check O2 is intended to be used in an environment where Oxygen Concentrators are serviced or repaired. This includes Hospitals, Nursing Homes, Extended Care Facilities, Patient Homes and Respiratory Device Service and Repair Centers.
(PLEASE DO NOT WRITE BELOW THIS LINE - CONTINUE ON ANOTHER PAGE IF NEEDED)
Concurrence of CDRH, Office of Device Evaluation (ODE)
(Division Sign-Off)
Division of Cardiovascular, Respiratory,
and Neurological Devices
Prescription Use X
(Per 21 CFR 801.109)
510(k) Number. K984295
OR
Over-The-Counter Use *_*_
(Optional Format 1-2-96)
Two short videos show you everything — or skip straight to the written tutorial if you'd rather read. You can reopen this any time from the Tutorial button in the top bar.
Part 1 — Search, results, and everyday workflows 16 min
Part 2 — Embeddings: the galaxy map 3 min
1. Search: exact and fuzzy
Type a phrase like "coronary artery calcification" into the search box. You get two kinds of results. Exact results match the literal phrase — prefix searches work ("coronary artery calcificati") but suffix searches do not. Fuzzy results match on the meaning and intent of your phrase rather than the exact words, and are sorted by relevance score. Hover over the Exact or Fuzzy badge on any row to see exactly why it matched.
Use the checkboxes above the results to narrow: SaMD keeps only software-only devices, AI / ML keeps only devices with AI.
Exact vs. fuzzy search: what's the difference?
Exact matches on the literal phrase (prefix search works, suffix does not). Fuzzy matches on the meaning and intent of the phrase rather than the exact words. Hover over the badge on any row to see why it matched.
You search "coronary artery calcification" and want only software devices with AI. What two filters do you apply?
Narrow by SaMD (software-only devices), then narrow by AI/ML (devices with AI).
2. The results table
Scroll right in the results table. The intended use is extracted for you — no need to open the PDF. The device story gives a high-level snapshot of what the device does and how it's used. The AI Performance sub-table shows each output name, acceptance criteria, observed values, and development/test dataset descriptions — the same format Innolitics uses for regulatory strategy outputs, and the fastest high-level fingerprint of an AI device. It is AI-generated but has been very reliable in practice.
Where do you find a device's intended use without opening the PDF?
Scroll right in the search results table. The intended use column is extracted for you; no need to dig into the 510(k) summary PDF.
What does the AI Performance sub-table show, and why is it useful?
Output name, acceptance criteria, observed values, development dataset description, and test dataset description. It's the same format we use for regulatory strategy output and Fast 510(k) input, and the fastest high-level fingerprint of an AI device. AI-generated but reliable in practice.
3. Judging fuzzy relevance
Fuzzy results trail off in relevance as you scroll. Use three signals to decide how far down to go: the fuzzy badge explanations, the intended use column, and whether your target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, you're past the relevant zone. A top hit with a low score (~0.4) and a stretched explanation is a hint the closest predicates are far away — the project may be headed for De Novo. Note the fuzzy search is a pattern match: it doesn't handle negation ("not") well, and hardware devices can appear — filter by SaMD/AI ML to cut them.
How do you judge how far down fuzzy search results to go?
Use the relevancy signals: the fuzzy badge explanations, the intended use column, and whether the target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, results are trailing off in relevancy.
4. Device detail page: chat and citations
Click a device name to open its detail page: device facts on the left, a chat window on the right. Ask something like "Describe the training data". The answer carries little citation bubbles — click one to jump to the highlighted passage in the source PDF, so you can verify every AI answer against the document. There's also a Download PDF button for sharing.
How do you verify an AI chat answer on the device detail page?
Click the citation bubbles to jump to the relevant highlight in the source document.
Reading rule for every project: how many summaries do you read in full?
At least the three most relevant 510(k) or De Novo summaries, in full. After that, use targeted chat questions to confirm your memory quickly. The tool supports this professional habit — it doesn't replace it.
5. Side-by-side comparison
Select multiple rows in the results table (aim for under ~10), then open the PDF Viewer tab. Ask one question — it goes to all selected devices in parallel, each with citations. This is the fastest way to compare and contrast devices: training data, PCCP scope, how they handled adding new scanners, and so on.
What does the side-by-side PDF viewer mode do?
Select multiple devices, open the PDF viewer tab, and ask one question (e.g., "Describe the training data"). It queries all selected devices simultaneously with citations, so you can compare and contrast quickly.
6. Collections
With rows selected, go to the Collections tab and create a labeled collection (e.g., "Cobb Angle Project"). Reload that selection any time — before a client call, pull up the collection and ask questions across all of its devices at once.
How do you save a set of selected devices for later use?
Select the rows, go to the Collections tab, and create a labeled collection (e.g., "Cobb Angle Project"). You can reload the selection anytime and carry it into the PDF viewer and other tabs that support selections.
7. Product codes and the regulations tree
Click a product code in the results to jump to it in the regulations tree — identification text, sibling product codes, and devices you can open in a PDF viewer on the right. Click a regulation number to see its identification, special controls, and related product codes. You can also search by product code or regulation number at the top of the tree. Always read the special controls if any exist for your device — it broadens your search and sharpens pre-kickoff research.
What can you do from the regulations tree view?
Browse product codes and regulation numbers, read the identification text and special controls, browse sibling product codes, open device PDFs on the right, and search by product code or regulation number at the top of the tree.
8. Chart view
Click Show Chart and segment by regulation number (or product code) to see which regulations dominate your result set. Clicking a regulation takes you into the regulations tree. Great for spotting that most matches are, say, hardware laparoscopic devices — a cue to go back and filter.
How do you see which regulations dominate a search result set?
Click "Show Chart" and segment by Regulation Number. Clicking a regulation takes you to the regulations tree.
9. The predicate graph
Open the Predicates tab for a family-tree view of predicate relationships. Click a node to trace its parents and children; selections from search carry over pre-selected. Commonly predicated devices are worth reading — a lot of people predicated them for a reason. The visual lineage is also handy on client calls, e.g. to show how a predicate family evolved and justify why your predicate still holds.
In the predicate graph, why are commonly predicated devices worth reading?
A lot of people predicated them for a reason. Clicking a node traces parents and children, and selections from search carry over pre-selected.
10. Embeddings: the galaxy map
The Embeddings tab plots every matching document in a 2-D "galaxy map" where semantically similar devices cluster together. Hover or click clusters to explore, and let AI label the clusters for you. Embeddings beat product codes for grouping: two devices can carry different product codes (LLZ vs. QIH) yet do the same thing — the embedding captures the meaning of the intended use and device story. This is also exactly how retrieval-augmented generation (RAG) works under the hood, and it makes a great visual on client calls.
Try it yourself
Head to the search page and work through a few of these AI/ML fuzzy searches to build intuition: perivascular fat on CT · aortic valve calcification opportunistic screening on noncontrast CT · breast cancer prediction on digital pathology slides · autism detection · gestational age prediction · a hearing aid that can also detect a pulse · foundation model based analysis of ECG · large language models · penetration test. Watch how the relevance scores, intended use, and AI Performance tables tell you when results stop being meaningful.