All eleven models of the Silcraft Whirlpool System are intended to be used for hydromassage and bathing.
Device Story
Silcraft Whirlpool System consists of tubs, shower wands, control consoles, water temperature controls, whirlpool motors, and jets. Patients are transported into tubs via lift/transfer devices or walk-in doors. Attendants or patients adjust water volume, temperature, and aeration via control console valves/knobs. Whirlpool jet direction is manually adjusted. Built-in disinfection systems (on most models) facilitate cleaning. Used in clinical or bathing settings to provide hydromassage and hygiene. Benefits include assisted bathing and therapeutic hydromassage for patients with limited mobility.
Clinical Evidence
No clinical data provided. Substantial equivalence is based on the long history of use of hydrobaths with similar technological characteristics and design.
Technological Characteristics
System components include a tub, shower wand, control console, water temperature control, whirlpool motor, multiple whirlpool jets, and an optional built-in automatic or manual disinfection system. Operated via manual valve and aeration switch adjustments. Compatible with non-AC-powered patient lift/transfer devices.
Indications for Use
Indicated for full immersion bathing and hydromassage of patients. Models 2001, 3700D, 3600, and 3600XL are for lower extremities in a sitting position. Models 2300 and 3300 are for patients in a sitting position. Models 4300, 5300, 4400SS, and 5400SS are for patients in a reclining position.
Regulatory Classification
Identification
An immersion hydrobath is a device intended for medical purposes that consists of water agitators and that may include a tub to be filled with water. The water temperature may be measured by a gauge. It is used in hydrotherapy to relieve pain and itching and as an aid in the healing process of inflamed and traumatized tissue, and it serves as a setting for removal of contaminated tissue.
Special Controls
*Classification.* Class II (special controls). The device, when it is a hydromassage bath or a powered sitz bath, is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 890.9.
Predicate Devices
Freedom Bath (Grand Traverse Technologies, Inc.)
Sanitas Whirlpool Bathing System (Dutton-Lainson Company)
Whirlpool Bathing System (Arjo-Century, Inc.)
Height Adjustment Tank with Hygiene Chair (Arjo-Century, Inc.)
Setma VHT Bathing System (Setma, Inc.)
Submission Summary (Full Text)
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FEB 2 6 1998
K971593
# 510(k) SUMMARY FOR SILCRAFT CORPORATION'S SILCRAFT WHIRLPOOL SYSTEM
Submitter's Name, Address, Telephone Number, And Contact Person
Silcraft Corporation 528 Hughes Drive Traverse City, MI 49686
Contact: Lee Dunsirn Silcraft Corporation Phone: (616) 946-4221 Facsimile: (616) 946-1740
#### Date Prepared
May 1, 1997
# Proprietary Name of the Devices
(1) Silcraft Access 3700 Whirlpool System, Access 3600 Whirlpool System, Model 2001 Bather, Model 2300 Junior Sit Tub, Model 3300 Sit Tub, Model 4300 Supine Tub, Model 5300 Supine Maxi Tub, Model 4400SS Whirlpool System, and Model 5400SS Whirlpool System
(2) Silcraft Model 1800 Lift, Model 1850 Lift, Model 1400 Sling Lift; Venture Sling Lift, Venture II Sling Lift, Model 1300 Traverse Battery Operated Lift/Transfer System, and Model 1200 Traverse Battery Operated Lift/Transfer System
(3) Silcraft Disinfectant
# Common or Usual Names
Whirlpool System Patient Lift and Transfer Device General Purpose Disinfectant
#### Classification Names
Immersion Hydrobath (21 C.F.R. § 890.5100) Non-AC-powered Patient Lift (21 C.F.R. § 880.5510) Medical Device Disinfectant (No classification regulation)
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# Predicate Devices
- Grand Traverse Technologies, Inc.'s Freedom Bath; (1)
- Dutton-Lainson Company's Sanitas Whirlpool Bathing System; (2)
- Arjo-Century, Inc.'s Whirlpool Bathing System; (3)
- Arjo-Century, Inc.'s Height Adjustment Tank with Hygiene Chair; and (4)
- Setma, Inc.'s Setma VHT Bathing System (5)
#### Intended Use
All eleven models of the Silcraft Whirlpool System are intended to be used for hydromassage and bathing.
# Principles of Operation
The principles of operation of the all models of the Silcraft Whirlpool System and the predicate are very similar. First, patients access these tubs by means of certain patient transport and lift devices; in certain models, ambulatory patients enter these devices through a door in the side of the tub. Second, once the patient is comfortably position in a seated or reclining in the Silcraft tub or a predicate device's tub, the attendant (or the patient in certain models of the Silcraft Whirlpool System and a couple of the predicate devices) adjusts the valves on the control console to set the volume and temperature of the water flowing into the tub or shower. Third, the attendant (or the patient in certain models of the Silcraft Whirlpool System and a couple of the predicate devices) operates the whirlpool feature of the device by adjusting one or more aeration switches or knobs on the control panel. The attendant (or the patient in certain models of the Silcraft Whirlpool System and a couple of the predicate devices) then manually adjust both the direction of the whirlpool jets by turning them. Fourth, patients exit the Silcraft Whirlpool System's or the predicate devices' tubs by means of the same patient transport and lift devices thev used to enter the tubs or by simply exiting the tub through the tub door in certain models. Fifth, the attendant cleans and disinfects the tub using the devices' built-in disinfection system.
#### Technical Characteristics
Ten of the eleven models of the Silcraft Whirlpool System and all of the predicate devices consist primarily of the following components: (1) a tub; (2) a shower wand; (3) a control console; (4) a water temperature control; (5) a whirlpool motor; (6) multiple whirlpool jets; and (7) a built-in automatic or manual disinfection system. One models does not have a built-in disinfection system.
Each model of the Silcraft Whirlpool System and all of the predicate devices are labeled for use with one or more patient lift and/or transfer devices, including certain Silcraft transporters and lifts ("the Silcraft Patient Lift"). The
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Silcraft Patient Lift and the legally marketed lifts are intended be used to transport patients from the bed to the bath and vice versa and to lift them into and out of the tub. Any minor technological differences between the Silcraft Patient Lifts, most of which are exempt from 510(k) requirements, and legally marketed lifts do not raise any new questions of safety or effectiveness.
The labeling for the models of the Silcraft Whirlpool System that have built-in disinfection systems state that Silcraft Disinfectant should be used to disinfect the devices. This general purpose disinfectant is registered with the Environmental Protection Agency ("EPA"). For this reason, the Silcraft Disinfectant device is substantially equivalent to reference products FDA has on file.
## Summary Basis for the Finding of Substantial Equivalence
The safety and effectiveness of the Silcraft Whirlpool System is based on the long history of use of hydrobaths with very similar technological characteristics. The Silcraft Whirlpool System and all of the predicate have the same intended use: bathing and hydromassage. The various models of the Silcraft Whirlpool System also have very similar principles of operation and technological characteristics as the predicate devices. Moreover, the minor technological differences between the Silcraft Whirlpool System and the predicate devices, namely the number of valves on their control consoles, certain components of their disinfection systems and different features of the lifts which they are labeled for use with, do not raise any new questions of safety or effectiveness. Thus, each model of the Silcraft Whirlpool System is substantially equivalent to the predicate devices.
All of the Silcraft Patient Lifts are exempt from 510(k) requirements because they are non-AC-powered lifts. Nevertheless, these patient lifts are substantially equivalent to legally marketed lifts with which the predicate devices are labeled for use because they have the same intended use, similar principles of operation and technological characteristics. Any minor differences in their technological characteristics do not raise any new questions of safety or effectiveness.
The BA a egistered Silerate Disinfect ant is substantial equivalent, to other general purpose disinfectants hy virtue of its EPA registration and compliance with BPA and Tandum of danderstanding cogarding liquid chamicale germicides and TDA syuidance documents regarding general purpose disinfectants of and-bydrobath 6mm
3
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Image /page/3/Picture/2 description: The image shows the logo for the U.S. Department of Health & Human Services. The logo consists of a stylized eagle with three heads, representing the department's focus on health, human services, and science. The eagle is surrounded by the text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" in a circular arrangement. The logo is black and white.
Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850
FEB 2 6 1998
Mr. Howard M. Holstein Hogan & Hartson Representing Silcraft Corporation 555 Thirteenth Street, NW Washington, DC 20004-1109
Re: K971592 XTank2 Mobile Extremity Whirlpool System K971593 Silcraft Whirlpool System Regulatory Class: II Product Code: ILJ February 11, 1998 Dated: February 12, 1998 Received:
Dear Mr. Holstein:
We have reviewed your Section 510 (k) notifications of intent to market the devices referenced above and we have determined these devices are substantially equivalent (for the indications for use stated in the enclosures) to 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, Drug, and Cosmetic Act (Act). You may, therefore, market the devices, 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 devices are classified (see above) into either class II (Special Controls) or class III (Premarket Approval), they may be subject to such additional controls. Existing major regulations affecting your devices can be found in the Code of Federal Requlations, Title 21, Parts 800 to 895. ਬ substantially equivalent determination assumes compliance with the current Good Manufacturing Practice requirement, 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 Drug Administration (FDA) will verify such assumptions. Failure to comply with the GMP regulation may result in regulatory In addition, FDA may publish further announcements action. concerning your devices 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.
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Page 2 - Mr. Howard M. Holstein
This letter will allow you to begin marketing your devices as described in your 510 (k) premarket notification. The FDA acberrood in your bial equivalence of your devices to legally marketed predicate devices results in a classification for marketed producted as permits your devices to proceed to the market.
If you desire specific advice for your devices 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) 594-4659. Additionally, for questions on the promotion and advertising of your devices, please contact the Office of Compliance at (301) 594-4639. Also, please note the regulation entitled, "Misbranding by reference to ene regaracton chercleda, "... EFR 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/dsmamain.html".
Sincerely yours,
Colton M. Witten, Ph.D.
Celta M. Witten, Ph.D., M.D. Director Division of General and Restorative Devices
Office of Device Evaluation Center for Devices and Radiological Health
Enclosures
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510(k) Number (if known):
Silcraft Whirlpool System Device Name:
Indications For Use:
Models 2001, 3700D, 3600, and 3600XL: Full immersion bathing and hydromassage of the lower extremities of patients in a sitting position.
Models 2300 and 3300: Full immersion and hydromassage of patients in a sitting position.
Models 4300, 5300, 4400SS, and 5400SS: Full immersion bathing and hydromassage of patients in a reclining position.
# (PLEASE DO NOT WRITE BELOW THIS LINE - CONTINUE ON ANOTHER PAGE IF NEEDED)
Concerrence of CDRR, Office of
A. Odeda
Prescription Use (Per 21 CFR 801.109)
OR
**Over-The-Counter Use**
(Optional Formal 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.