The Stone Clear ultrasonic propulsion device is indicated for the repositioning of residual stone fragments post-lithotripsy that are located in the upper urinary tract of adult patients to facilitate passage, where any individual fragment is less than or equal to 5 mm.
Device Story
Stone Clear is a portable, hand-held ultrasonic propulsion system used to reposition residual urinary stone fragments (≤ 5 mm) post-lithotripsy. The system comprises a high-voltage generator, a piezoelectric therapy probe, and a coaxial diagnostic ultrasound imaging probe. The operator applies coupling gel, scans the abdomen to locate fragments, and aligns the therapy probe. Upon foot-pedal activation, the generator drives the therapy probe to emit focused acoustic pulses; momentum exchange from these pulses pushes fragments toward the calyx or kidney exit. Real-time imaging allows the operator to monitor displacement and manually terminate the burst (max 1-3 seconds). The device is used in clinical environments to facilitate stone passage, potentially reducing the need for invasive interventions. The system includes RFID technology for pay-per-use licensing and supports coexistence with other devices on the same platform.
Clinical Evidence
Bench testing only. Compliance with IEC 60601-1 (electrical safety), IEC 60601-1-2 (EMC), IEC 60601-2-5/2-36/2-37, and IEC 61846 (acoustic power, intensity, focal geometry, and probe heating) was demonstrated. Software verification and validation were performed per IEC 62304.
Technological Characteristics
System includes high-voltage generator, piezoelectric therapy probe, and diagnostic ultrasound imaging probe. Coaxial alignment of imaging and therapy transducers. Hand-held, portable form factor. Connectivity includes RFID for licensing. Standards met: IEC 60601-1, IEC 60601-1-2, IEC 60601-2-5, IEC 60601-2-36, IEC 60601-2-37, IEC 61846, and IEC 62304.
Indications for Use
Indicated for adult patients with residual stone fragments (≤ 5 mm) in the upper urinary tract post-lithotripsy to facilitate passage.
Regulatory Classification
Identification
An ultrasonic urinary stone propulsion device visualizes urinary stones in the upper urinary tract and delivers focused acoustic pulses to reposition the stones to facilitate their passage. The Stone Clear device is indicated for the repositioning of residual stone fragments post-lithotripsy that are located in the upper urinary tract of adult patients to facilitate passage, where any individual fragment is less than or equal to 5 mm.
Special Controls
In combination with the general controls of the FD&C Act, the ultrasonic urinary stone propulsion device is subject to the following special controls: (1) Clinical performance data must demonstrate that the device performs as intended under anticipated conditions of use. Data must evaluate the following: The device performance in repositioning urinary stones and facilitating their (i) passage: and (ii) Device and procedure related adverse events, including pain, discomfort, hematuria, and urinary obstruction. (2) Non-clinical performance testing must demonstrate that the device performs as intended under anticipated conditions of use. The following performance characteristics must be tested: Acoustic output characteristics, including acoustic power and intensity, focal (i) geometry, and target accuracy; and Probe surface heating. (ii) (3) Performance testing must demonstrate the electromagnetic compatibility (EMC), electrical safety, and mechanical safety of the device in the intended use environment. (4) Performance data must demonstrate that all patient-contacting components of the device are biocompatible. (5) Performance data must validate the reprocessing instructions for the reusable components of the device. (6) Software verification, validation, and hazard analysis must be performed. (7) Labeling must include: The size of the stones treated with the device; (i) The acoustic properties of the device: (ii) (iii) Specific instructions on identifying an appropriate acoustic window; (iv) Summary of the clinical performance data conducted with the device; and (v) Reprocessing instructions.
Predicate Devices
Stone Clear ultrasonic urinary stone propulsion device (DEN230082)
Submission Summary (Full Text)
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[LOGO]
FDA
U.S. FOOD & DRUG
ADMINISTRATION
July 29, 2026
Sonomotion, Inc.
Emily Hergenreter
VP, Clinical Affairs
1600 W. Hillsdale Blvd., Suite 105
San Mateo, California 94402
Re: K262200
Trade/Device Name: Stone Clear (BWSC-LP9-02)
Regulation Number: 21 CFR 876.4690
Regulation Name: Ultrasonic Urinary Stone Propulsion Device
Regulatory Class: II
Product Code: QNA
Dated: June 29, 2026
Received: June 29, 2026
Dear Emily Hergenreter:
We have reviewed your section 510(k) premarket notification of intent to market the device referenced above and 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, Drug, and Cosmetic Act (the Act) that do not require approval of a premarket approval application (PMA). You may, therefore, market the device, subject to the general controls provisions of the Act. Although this letter refers to your product as a device, please be aware that some cleared products may instead be combination products. The 510(k) Premarket Notification Database available at https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfpmn/pmn.cfm identifies combination product submissions. 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. Please note: The Center for Devices and Radiological Health (CDRH) does not evaluate information related to contract liability warranties. We remind you, however, that device labeling must be truthful and not misleading.
If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it may be subject to additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 898. In addition, the Food and Drug Administration (FDA) may publish further announcements concerning your device in the Federal Register.
Additional information about changes that may require a new premarket notification are provided in the FDA guidance documents entitled "Deciding When to Submit a 510(k) for a Change to an Existing Device"
U.S. Food & Drug Administration
10903 New Hampshire Avenue
Silver Spring, MD 20993
www.fda.gov
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K262200 - Emily Hergenreter
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(https://www.fda.gov/media/99812/download) and "Deciding When to Submit a 510(k) for a Software Change to an Existing Device" (https://www.fda.gov/media/99785/download).
Your device is also subject to, among other requirements, the Quality Management System Regulation (QMSR) (21 CFR Part 820), which includes, but is not limited to, ISO 13485 clause 7.3 (Design controls), ISO 13484 clause 8.3 (Nonconforming product), and ISO 13485 clause 8.5 (Corrective and preventative action). Please note that regardless of whether a change requires premarket review, the QMSR requires device manufacturers to review and approve changes to device design and production (ISO 13485 clause 7.3 and 21 CFR 820.70) and document changes and approvals in the device master record (21 CFR 820.181).
Please be advised that FDA's issuance of a substantial equivalence determination does not mean that FDA has made a determination that your device complies with other requirements of the Act or any Federal statutes and regulations administered by other Federal agencies. You must comply with all the Act's requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Part 801); medical device reporting (reporting of medical device-related adverse events) (21 CFR Part 803) for devices or postmarketing safety reporting (21 CFR Part 4, Subpart B) for combination products (see https://www.fda.gov/combination-products/guidance-regulatory-information/postmarketing-safety-reporting-combination-products); good manufacturing practice requirements as set forth in the Quality Management System Regulation (QMSR) (21 CFR Part 820) for devices or current good manufacturing practices (21 CFR Part 4, Subpart A) for combination products; and, if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR Parts 1000-1050.
All medical devices, including Class I and unclassified devices and combination product device constituent parts are required to be in compliance with the final Unique Device Identification System rule ("UDI Rule"). The UDI Rule requires, among other things, that a device bear a unique device identifier (UDI) on its label and package (21 CFR 801.20(a)) unless an exception or alternative applies (21 CFR 801.20(b)) and that the dates on the device label be formatted in accordance with 21 CFR 801.18. The UDI Rule (21 CFR 830.300(a) and 830.320(b)) also requires that certain information be submitted to the Global Unique Device Identification Database (GUDID) (21 CFR Part 830 Subpart E). For additional information on these requirements, please see the UDI System webpage at https://www.fda.gov/medical-devices/device-advice-comprehensive-regulatory-assistance/unique-device-identification-system-udi-system.
Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR 807.97). For questions regarding the reporting of adverse events under the MDR regulation (21 CFR Part 803), please go to https://www.fda.gov/medical-devices/medical-device-safety/medical-device-reporting-mdr-how-report-medical-device-problems.
For comprehensive regulatory information about medical devices and radiation-emitting products, including information about labeling regulations, please see Device Advice (https://www.fda.gov/medical-devices/device-advice-comprehensive-regulatory-assistance) and CDRH Learn (https://www.fda.gov/training-and-continuing-education/cdrh-learn). Additionally, you may contact the Division of Industry and Consumer Education (DICE) to ask a question about a specific regulatory topic. See
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the DICE website (https://www.fda.gov/medical-devices/device-advice-comprehensive-regulatory-assistance/contact-us-division-industry-and-consumer-education-dice) for more information or contact DICE by email (DICE@fda.hhs.gov) or phone (1-800-638-2041 or 301-796-7100).
Sincerely,
Mark R. Kreitz -S
for Mark J. Antonino, M.S.
Assistant Director
DHT3B: Division of Reproductive,
Gynecology, and Urology Devices
OHT3: Office of Gastrorenal, ObGyn,
General Hospital, and Urology Devices
Office of Product Evaluation and Quality
Center for Devices and Radiological Health
Enclosure
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| Indications for Use | | |
| --- | --- | --- |
| Please type in the marketing application/submission number, if it is known. This textbox will be left blank for original applications/submissions. | K262200 | ? |
| Please provide the device trade name(s). | | ? |
| Stone Clear (BWSC-LP9-02) | | |
| Please provide your Indications for Use below. | | ? |
| The Stone Clear ultrasonic propulsion device is indicated for the repositioning of residual stone fragments post-lithotripsy that are located in the upper urinary tract of adult patients to facilitate passage, where any individual fragment is less than or equal to 5 mm. | | |
| Please select the types of uses (select one or both, as applicable). | ☑ Prescription Use (21 CFR 801 Subpart D) ☐ Over-The-Counter Use (21 CFR 801 Subpart C) | ? |
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K262200
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Stone Clear (Gen 2.0)
Special 510(k) Premarket Notification
Property of SonoMotion, Inc.
# 510(K) SUMMARY
# 1. SUBMITTER INFORMATION
| Applicant Name: | SonoMotion, Inc. |
| --- | --- |
| Applicant Address: | 1600 W Hillsdale Blvd Suite 105 San Mateo, CA 94402 |
| Primary Correspondent: | Emily Hergenreter, VP – Clinical Affairs SonoMotion 925-594-9600 emily.hergenreter@sonomotion.com |
| Secondary Correspondent: | Oren Levy, CEO SonoMotion 415-672-2631 oren.levy@sonomotion.com |
| Date Prepared | June 29, 2026 |
# 2. DEVICE INFORMATION
| Proprietary Trade Name: | Stone Clear™ |
| --- | --- |
| Common Name: | Ultrasonic urinary stone propulsion device |
| Classification Name: | Ultrasonic urinary stone propulsion device |
| Product Code: | QNA |
| Regulatory Class: | Class II |
| Regulation Number: | 21 CFR 876.4690 |
| Panel: | Gastroenterology/Urology |
# 3. PREDICATE DEVICE
The Stone Clear device is substantially equivalent to the previously cleared Stone Clear ultrasonic urinary stone propulsion device (DEN230082, Product Code: QNA).
# 4. DEVICE DESCRIPTION
The Stone Clear device is intended for the repositioning of residual stone fragments located in the upper urinary tract of adult patients to facilitate passage, where any individual fragment is less than or equal to 5 mm. The primary components include a diagnostic ultrasound imaging workstation, imaging probes, a high voltage signal generator, and a piezoelectric therapy probe. The generator controls and drives the therapy probe, which delivers the acoustic pulses required for repositioning the stone fragments. A lens is used to focus the acoustic waves to the stone target. The exchange in momentum from the focused
Attachment 47:
510(k) Summary
Page 1 of 4
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K262200
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Stone Clear (Gen 2.0)
Special 510(k) Premarket Notification
Property of SonoMotion, Inc.
ultrasound beam to the stone fragment(s) causes the fragment(s) to move away from the face of the transducer.
The imaging workstation and associated ultrasound imaging probe provide the user interface and real-time image guidance for the Stone Clear procedure. The imaging and therapy (pushing) probe are coaxially aligned, with the imaging probe docking into the housing of the therapy probe through a capture mechanism (collar). The probe assembly is designed to couple directly to the patient's skin and to be hand-held. A foot pedal is used to initiate the therapy push pulse from the Generator.
The Stone Clear device is a portable system the size of a diagnostic ultrasound system, and the user operates the device similar to a diagnostic ultrasound system. The user applies ultrasound coupling gel to the therapy/imaging probes, places the probe assembly against the patient's skin, and scans the abdomen to locate the stone fragment(s) using standard ultrasound imaging techniques. Once the target fragment(s) is identified, the operator adjusts the probe position so that the fragment(s) is within the target zone, with the direction of pushing force toward the exit of the calyx or kidney. This may be accomplished by adjusting the probe position and/or the patient position. The operator initiates therapy by pressing the foot pedal and monitors the displacement of the fragment(s) in real-time via the coaxial aligned imaging probe. The operator has the option to stop the therapy burst at any time by releasing the foot pedal. If the foot pedal is not released, the Generator will terminate the therapy burst when the maximum duration (e.g., 1 to 3 seconds) is reached.
## 5. INTENDED USE/INDICATIONS FOR USE
The Stone Clear ultrasonic propulsion device is indicated for the repositioning of residual stone fragments post-lithotripsy that are located in the upper urinary tract of adult patients to facilitate passage, where any individual fragment is less than or equal to 5 mm.
The Indication for Use for the Stone Clear device is the same as the predicate device.
## 6. TECHNOLOGICAL CHARACTERISTICS COMPARISON
The SonoMotion Stone Clear device has similar technological characteristics as the predicate device. The differences between the Stone Clear and predicate device do not introduce new or different questions of safety or effectiveness.
### Similar Technological Characteristics
The subject Stone Clear device maintains the following similar technological characteristics as the predicate device:
- Non-invasive repositioning of residual stone fragments with focused ultrasound
- Primary system components include a high voltage generator, therapy probe, control console, and imaging/localization system
- Single piezoelectric therapy probe
Attachment 47:
510(k) Summary
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K262200
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Stone Clear (Gen 2.0)
Special 510(k) Premarket Notification
Property of SonoMotion, Inc.
- Therapy probe couples directly to the skin
- Uses an FDA cleared ultrasound imaging device for imaging/localization system
- Imaging transducer is mounted inline with the therapeutic acoustic wave path
- Probe assembly is handheld
- Transportable for use in multiple healthcare environments
# **Technological Differences**
The Stone Clear device achieves the same function as the predicate device with the following minor technological differences:
- Introduction of RFID technology to support pay-per-use licensing
- Minor system updates (software and user interface) to support pay-per-use licensing
- Coexistence of Stone Clear and Break Wave devices on the same device platform
# **7. PERFORMANCE DATA**
# **Non-Clinical Performance Data**
Applicable safety and performance requirements for medical devices from the following compliance standards were met in support of this premarket notification. Testing is consistent with the predicate device and supports substantial equivalence.
- Electrical Safety and EMC
- IEC 60601-1
- IEC 60601-1-2
- Basic Safety and Performance of Medical Electrical Equipment
- IEC 60601-1
- Acoustic Power and Intensity
- IEC 60601-2-5
- IEC 60601-2-36
- IEC 61846
- IEC 60601-2-37
- Focal Geometry and Target Accuracy
- IEC 60601-2-36
- IEC 61846
- Probe Surface Heating
- IEC 60601-2-37
- Software Verification and Validation Testing
- IEC 62304
Additional verification and validation testing was performed to ensure the device met all its design specifications.
Attachment 47:
510(k) Summary
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K262200
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Stone Clear (Gen 2.0)
Special 510(k) Premarket Notification
Property of SonoMotion, Inc.
### 8. CONCLUSION
Following the FDA guidance document, “The 510(k) Program: Evaluating Substantial Equivalence in Premarket Notifications,” SonoMotion has established that the Stone Clear (Gen 2.0) device is substantially equivalent to the predicate device. The Stone Clear subject device has the same intended use and many similar characteristics as the predicate device. The non-clinical data provided in support of this premarket notification demonstrate that the minor technological differences between the subject and predicate devices do not raise any new or different questions of safety and effectiveness.
Attachment 47:
510(k) Summary
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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.
