The DHD Stealth Metered Dose Inhaler (MDI) Spacer (Without Integral Actuator) assists with the delivery of aerosolized medications when used in conjunction with commercially available Metered Dose Inhaler (MDI) canisters with their associated actuator elbows. In addition, for convenience, the MDI canister/elbow, may be stored inside of the Stealth when not in use (the spacer acts as the MDI canister/elbow holding chamber). Pilot is a one piece, silicone rubber face mask that may be attached to the Stealth MDI holding chamber as an interface between the Stealth MDI and the patient's face/mouth region. Federal (USA) Law restricts this device to sale by or on the order of a physician.
Device Story
Pilot is a single-piece, injection-molded silicone rubber face mask designed as an accessory for the Stealth MDI Spacer. It attaches to the spacer via a tapered fitting with a stop ledge to ensure secure connection. The device serves as an interface between the Stealth MDI holding chamber and the patient's face/mouth region. It is intended for single-patient use and is manually cleanable in warm soapy water. The mask is available in small, medium, and large sizes to accommodate different facial structures. By providing a mask interface, the device assists in the delivery of aerosolized medications, helping to reduce coordination and technique-related challenges associated with standard MDI use. It is used in both clinical and home environments under physician prescription.
Clinical Evidence
No clinical data or specific studies were conducted for this submission. The device is a passive accessory; substantial equivalence is based on design and material characteristics.
Technological Characteristics
Material: Bayer LSR 20 series silicone rubber. Form factor: Single-piece, injection-molded, tapered fitting with stop ledge. Sizes: Small, medium, large. Connectivity: Mechanical interface only. Energy source: None. Sterilization: Manual cleaning by user.
Indications for Use
Indicated for patients capable of following directions for MDI spacer therapy as determined by a physician, including those requiring a mask interface for aerosolized medication delivery. May be used in hospital or home settings.
Regulatory Classification
Identification
A nebulizer is a device intended to spray liquids in aerosol form into gases that are delivered directly to the patient for breathing. Heated, ultrasonic, gas, venturi, and refillable nebulizers are included in this generic type of device.
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KC981167
# JUN 1 8 1998
ಿಗೆ
### 510(k) SUMMARY As Required by 807.92(c)
3-4-98
Stealth/Pilot (Final Name to Be Determined)
MDI Spacer with Facemask
Spacer - Class II - 868.5630
Oxygen Mask - Class 1 - 868.5580
- DHD Healthcare 1. Submitter: 125 Rasbach Street Canastota, NY 13032
Phone: 315-697-2221 315-697-8083 Fax:
-
-
-
Contact:
Jean Wallace, Manager, Regulatory Affairs
#### 2. Device Name
- Trade Name ●
- . Common name Classification name
#### 3. Predicate Device:
- 1-"ACE" MDI Spacer 510(k)'s K913326A, K953206, K961973 DHD Canastota, NY 13032
- "Stealth" MDI Spacer 2-510(k) K973532 DHD Canastota, NY 13032
The Pilot device is a mask attachment for the Stealth Metered Dose 4. Device Description: Inhaler (MDI) Spacer. The Pilot mask fits directly onto the Stealth MDI Spacer.
Pilot is a single piece, injection molded, silicone rubber piece. It is intended for single patient use and may be disassembled from the Stealth MDI for convenient cleaning the device, by hand, in warm soapy water.
The Pilot mask will be available in several sizes. and large masks. The mask sizes are designed to fit comfortably to a users face.
The masks also include a tapered fitting designed to mate with the Stealth mouthpiece. The tapered fitting includes a small ledge which serves as a stop, preventing the mask from being advanced too far onto the Stealth mouthpiece.
#### ഹ് Intended Use
ﻟﻤﺴﺘﻌﻤﻠﻬﺎ
Pilot is a one piece, silicone rubber face mask that may be attached to the Stealth MDI holding chamber as an interface between the Stealth MDI and the patient's face/mouth region. The DHD Stealth Metered Dose Inhaler (MDI) Spacer (Without Integral Actuator) assists with the delivery of aerosolized medications when used in conjunction with commercially available Metered Dose Inhaler (MDI) canisters with their associated actuator elbows. In addition, for convenience, the MDI canister/elbow, may be stored inside of the Stealth when not in use (the spacer acts as the MDI canister/elbow holding chamber).
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## 6. Technological Information
- 6.1 The mask must fit securely to the Stealth MDI spacer and be easily removed for cleaning. The tapered interface between the Pilot mask and Stealth mouthpiece meets this requirement. No testing is required. Pilot meets this requirement.
- 6.2 The mask shall be available in three sizes. As shown by the drawings in the device description, the Pilot mask will be available in small, medium and large sizes. No testing is required. Pilot meets this requirement.
- 6.3 The mask must not interfere with MDI spacer performance. The mask system does not contain any valving, nor does the mask interface interfere with any of the functional areas of the Stealth spacer. No additional testing is required. Pilot meets this requirement.
- 6.4 The mask shall be manufactured from a clear or translucent elastomer. The Bayer LSR 20 series of silicone rubber is clear/translucent. No additional testing is required. Pilot meets this requirement.
### 7. Summary of Studies
There were no specific studies completed in association with this submission.
- Conclusions Drawn from Studies 8. None
ﺳﻨﺴﻪ
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Image /page/2/Picture/1 description: The image shows the seal of the Department of Health & Human Services USA. The seal is circular, with the words "DEPARTMENT OF HEALTH & HUMAN SERVICES USA" arranged around the perimeter. In the center of the seal is an abstract image of an eagle with three overlapping wings.
Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850
JUN 18 1998
Mr. Jean Wallace Manager, Requlatory Affairs DHD Healthcare One Madison Street Wampsville, NY 13163
Re : K981167 Stealth Pilot Kit Requlatory Class: II (two) Product Code: 73 CAF Dated: March 23, 1998 April 1, 1998 Received:
Dear Mr. Wallace:
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. However, you are responsible to determine that the medical devices you use as components in the kit have either been determined as substantially equivalent under the premarket notification process (Section 510(k) of the act), or were legally on the market prior to May 28, 1976, the enactment date of the Medical Device Amendments. Please note: If you purchase your device components in bulk (i.e., unfinished) and further process (e.g., sterilize) you must submit a new 510(k) before including these components in your kit. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, and 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
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Page 2 - Mr. Jean Wallace
inspections, FDA will verify such assumptions. Failure to comply with the GMP regulation may result in regulatory action. In addition, the Food and Drug Administration (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.
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 the 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,
Woy Saparmem mma
Thomas J. Callahan, Ph Director Division of Cardiovascular, Respiratory, and Neurological Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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Page 1 of of _1__
... . . . . . . . . . . . . . . . . . . . . . . . . . . .
~10(k) Number (if known): ____________________________________________________________________________________________________________________________________________________
Stealth Metered Dose Inhaler Kit - Adding Pilot Face Mask Device Name:
Indications For Use:
- 1 Purpose:
The DHD Stealth Metered Dose Inhaler (MDI) Spacer (Without Integral Actuator) assists with the rns Bris Gount Medications when used in conjunction with commercially available Metered Dose Inhaler (MDI) canisters with their associated actuator elbows. In addition, for convenience, the MDI canister/elbow, may be stored inside of the Steath when not in use (the spacer acts as the MDI canister/elbow holding chamber). Pilot is a one piece, silicone rubber face mask that may be attached to the Stealth MDI holding chamber as an interface between the Stealth MDI and the patient's face/mouth region.
- 2 Claims:
- Use of the Stealth Spacer, without integral actuator, assists with the delivery of aerosolized 2.1 medications from Metered Dose Inhaler (MDI) canisters.
- Use of the Stealth Spacer reduces patient coordination and technique oriented problems 2.2 associated with MDI drug delivery.
- When used with the Stealth Spacer, the Pilot face mask reduces coordination and 2.3 technique problems associated with MDI drug delivery in lieu of the Stealth Mouthpiece.
- 3 Target Patient Population:
- Patients capable of following directions for hand held use of Metered Dose Inhaler (MDI) 3.1 Spacer therapy as determined by a physician.
- Patients requiring mask interface. Pilot allows a clinical choice for use of the Stealth 3.2 MDI spacer with a mouthpiece and/or a mask .
- 4 Intended Environment For Use
- Labeling reflects the statement: "Federal (USA) Law restricts this device to sale by or on the 4.1 order of a physician."
- 4.2 May be used in hospital as well as the home.
- 5 Legally Marketed Predicate Devices:
- ACE® Aerosol Cloud Enhancer, manufactured by DHD Healthcare, Canastota, New 5.1 York.
- 5.2 Stealth Metered Dose Inhaler(MDI) Spacer, manufactured by DHD Healthcare, Canastota, NY 13032
(PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED)
| Concurrence of CDRH, Office of Device Evaluation (ODE) | | |
|--------------------------------------------------------|----|----------------------|
| | | |
| Prescription Use | OR | Over-The-Counter Use |
| (Per 21 CFR 801.109) | | |
Wolf Sapmka MD
(Division Sign-Off)
Division of Cardiovascular, Respiratory, and Neurological Devices
| 510(k) Number | K981167 |
|---------------|---------|
|---------------|---------|
(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.