The SIR-Spheres® Microspheres Activity Calculator (SMAC) is intended as a tool to assist with developing personalized dose activity calculations, based on relevant data, for patients undergoing selective internal radiation therapy (SIRT) with SIR-Spheres Y-90 resin microspheres. Using the BSA formula, the SMAC automatically performs calculations that are typically done manually by a physicist and/ or licensed healthcare practitioner. The algorithms used have been established and documented in scientific literature.
Device Story
SMAC is a web-based software tool for physicians and licensed healthcare practitioners in hospitals, clinics, or interventional suites. It automates Y-90 resin microsphere dose activity calculations for SIRT. Input: patient-specific data (height, weight). Operation: software applies the Body Surface Area (BSA) formula (BSA = 0.20247 × height^0.725 × weight^0.425) to compute prescribed activity. Output: calculated dose activity (GBq). The device does not perform imaging. It serves as a decision-support tool; clinicians retain responsibility for final therapy determination. Benefits include increased efficiency and reduced manual calculation errors.
Clinical Evidence
No clinical data. Performance evaluation based on bench testing of software functionality and verification of calculation accuracy against the documented BSA formula.
Technological Characteristics
Web-based software application; compatible with major web browsers (Chrome, Firefox, Safari, Opera, IE 9+). Implements a deterministic mathematical algorithm (BSA formula) for dosimetry. Standalone calculation tool; no imaging capabilities. No physical materials of construction.
Indications for Use
Indicated for patients undergoing selective internal radiation therapy (SIRT) with SIR-Spheres Y-90 resin microspheres to assist in developing personalized dose activity calculations.
Regulatory Classification
Identification
An emission computed tomography system is a device intended to detect the location and distribution of gamma ray- and positron-emitting radionuclides in the body and produce cross-sectional images through computer reconstruction of the data. This generic type of device may include signal analysis and display equipment, patient and equipment supports, radionuclide anatomical markers, component parts, and accessories.
{0}------------------------------------------------
October 23, 2020
Image /page/0/Picture/1 description: The image contains the logo of the U.S. Food and Drug Administration (FDA). The logo consists of two parts: the Department of Health & Human Services logo on the left and the FDA logo on the right. The FDA logo features the letters 'FDA' in a blue square, followed by the words 'U.S. FOOD & DRUG ADMINISTRATION' in blue text.
Sirtex Medical US Holdings, Inc. Sirtex Medical Pty Ltd. % Mr. Michael P. Hanley Senior Regulatory Affairs Specialist 300 Unicorn Park, 2nd Floor WOBURN MA 01801
Re: K202392
Trade/Device Name: SIR-Spheres Microspheres Activity Calculator (SMAC) Regulation Number: 21 CFR 892.1200 Regulation Name: Emission computed tomography system Regulatory Class: Class II Product Code: KPS Dated: August 19, 2020 Received: August 21, 2020
Dear Mr. Hanley:
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 (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 located 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: 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, FDA may publish further announcements concerning your device in the Federal Register.
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 of medical device-related adverse events) (21 CFR 803) for
{1}------------------------------------------------
devices or postmarketing safety reporting (21 CFR 4, Subpart B) for combination products (see https://www.fda.gov/combination-products/guidance-regulatory-information/postmarketing-safety-reportingcombination-products); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820) for devices or current good manufacturing practices (21 CFR 4, Subpart A) for combination products; and, if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.
Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR Part 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-device-safety/medical-device-reportingmdr-how-report-medical-device-problems.
For comprehensive regulatory information about mediation-emitting products, including information about labeling regulations, please see Device Advice (https://www.fda.gov/medicaldevices/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 the DICE website (https://www.fda.gov/medical-device-advice-comprehensive-regulatoryassistance/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.
For
Thalia T. Mills, Ph.D. Director Division of Radiological Health OHT7: Office of In Vitro Diagnostics and Radiological Health Office of Product Evaluation and Quality Center for Devices and Radiological Health
Enclosure
{2}------------------------------------------------
# Indications for Use
510(k) Number (if known) K202392
Device Name
SIR-Spheres Microspheres Activity Calculator (SMAC)
Indications for Use (Describe)
The SIR-Spheres® Microspheres Activity Calculator (SMAC) is intended as a tool to assist with developing personalized dose activity calculations , based on relevant data, for patients undergoing selective internal radiation therapy (SIRT) with SIR-Spheres Y-90 resin microspheres . Using the BSA formula, the SMAC automatically performs calculations that are typically done manually by a physicist and/ or licensed healthcare practitioner. The algorithms used have been established and documented in scientific literature.
| Type of Use (Select one or both, as applicable) | |
|-----------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------|
| <div><span style="font-size:16px">☒</span> Prescription Use (Part 21 CFR 801 Subpart D)</div> | <div><span style="font-size:16px">☐</span> Over-The-Counter Use (21 CFR 801 Subpart C)</div> |
### CONTINUE ON A SEPARATE PAGE IF NEEDED.
This section applies only to requirements of the Paperwork Reduction Act of 1995.
#### *DO NOT SEND YOUR COMPLETED FORM TO THE PRA STAFF EMAIL ADDRESS BELOW.*
The burden time for this collection of information is estimated to average 79 hours per response, including the time to review instructions, search existing data sources, gather and maintain the data needed and complete and review the collection of information. Send comments regarding this burden estimate or any other aspect of this information collection, including suggestions for reducing this burden, to:
> Department of Health and Human Services Food and Drug Administration Office of Chief Information Officer Paperwork Reduction Act (PRA) Staff PRAStaff@fda.hhs.gov
"An agency may not conduct or sponsor, and a person is not required to respond to, a collection of information unless it displays a currently valid OMB number."
{3}------------------------------------------------
#### SECTION 5 K202392 510 (k) Summary
### 510(k) Summary – SIR-Spheres Microspheres Activity Calculator (SMAC)
This 510(k) Summary is being submitted in accordance with the requirements of the Safe Medical Device Act (SMDA) of 1990. The content contained in this 510 (k) summary has been provided in conformance with 21 CFR 807.92(c).
Date Prepared: August 19, 2020
### A. Sponsor
Sirtex Medical Pty Ltd Shop 6, 207 Pacific Hwy St Leonards NSW 2065, Australia
### B. Contact
Michael Hanley Senior Regulatory Affairs Specialist 781-721-3842 Email: Michael.Hanley@sirtex.com
### C. Device Name
Trade Name:
| Trade Name: | SIR-Spheres Microspheres Activity Calculator (SMAC) |
|-----------------------|-----------------------------------------------------------------|
| Common/Usual Name: | System, Imaging Processing, Radiological |
| Classification Panel: | Radiology |
| Pro Code: | KPS/Class II |
| Regulation Number | 21 CFR 892.1200 |
### D. Legally Marketed Device (Predicate Device)
The following legally marketed device has been used for comparison.
| Proprietary/Trade Name | |
|------------------------|-------------------------------------|
| Trade Name: | HERMES Hybrid3D v3.0 SIRT (K181468) |
### E. Description of the device that is subject of this premarket notification:
The SIR-Spheres Microspheres Activity Calculator (SMAC) is a software modelling program that is designed to assist physicians and licensed healthcare practitioners when prescribing Selective Internal Radiation Therapy (SIRT) with SIR-Spheres Y-90 resin microspheres. It allows physicians
510(k) Premarket Notification Sirtex Medical Pty Ltd.
{4}------------------------------------------------
and licensed healthcare practitioners to determine an individualized dose activity calculation based upon specific patient characteristics. The program computes the prescribed activity calculation using the Body Surface Area (BSA) formula that has been published in peer reviewed journals of medicine and models treatment parameters. This is a tool only and does not replace the need for the physician or licensed healthcare practitioner to make an independent determination of the therapy best suited for the patient.
The SIR-Spheres Microspheres Activity Calculator (SMAC) tool employs a simple algorithm to calculate Y90 dose activity based on the Body Surface Area (BSA) model and patient specific user inputs. The SMAC tool does not incorporate imaging capabilities.
The HERMES Hybrid3D SIRT (K181468) is an acceptable predicate device because both devices perform dosimetry calculations based on the BSA formula
Calculated Activity (GBq)
BSA (m2) = 0.20247 × height (m)0.725 x weight(kg)0
# Figure 1: Prescribed activity calculation of SIR-Spheres resin microspheres
### F. Indications for Use/Intended Use
The proposed SMAC Calculator application has the following Indications for Use: The SIR-Spheres® Microspheres Activity Calculator (SMAC) is intended as a tool to assist with developing personalized dose activity calculations, based on relevant patient data, for patients underqoing selective internal radiation therapy (SIRT) with SIR-Spheres Y-90 resin microspheres. Using the BSA formula, the SMAC automatically performs calculations that are typically done manually by a physician or licensed healthcare practitioner. The algorithms used have been established and documented in scientific literature.
### The proposed SMAC Calculator application has the following Intended Use:
The SIR-Spheres Microspheres Activity Calculator (SMAC) is intended as a tool to assist with developing personalized dose activity calculations, based on relevant patient data, for patients undergoing selective internal radiation therapy (SIRT) with SIR-Spheres Y-90 resin microspheres.
{5}------------------------------------------------
## G. Summary of Similarities and Differences in Technological Characteristics and Performance
The proposed SMAC software is equivalent when compared to the marketed predicate in comparison to software design, function, and operation as the identified predicate. The table below provides the comparison of the devices.
| Characteristic | Proposed Device:<br>Sirtex<br>SIR-Spheres Microspheres<br>Activity Calculator (SMAC) | Predicate: Hermes<br>Medical Solutions<br>Hybrid 3D<br>K181468 | Comparison |
|------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Indications<br>for Use | The SIR-Spheres®<br>Microspheres Activity<br>Calculator (SMAC) is<br>intended as a tool to assist<br>with developing<br>personalized dose activity<br>calculations, based on<br>relevant patient data, for<br>patients undergoing<br>selective internal radiation<br>therapy (SIRT) with SIR-<br>Spheres Y-90 resin<br>microspheres. Using the<br>BSA formula, the SMAC<br>automatically performs<br>calculations that are<br>typically done manually by<br>a physician or licensed<br>healthcare practitioner.<br>The algorithms used have<br>been established and<br>documented in scientific<br>literature. | Hybrid3D is a software<br>application that can be<br>used to process, display,<br>analyze and manage<br>nuclear medicine and<br>other medical imaging<br>data transferred from<br>other workstations or<br>acquisition stations | Similar<br><br>Both software<br>programs<br>calculate dose<br>based on the<br>exact same<br>SIRTEX BSA<br>formula as seen<br>in the<br>instructions for<br>use.<br><br>Hybrid 3D<br>includes more<br>features than<br>dose calculation,<br>whereas the<br>SMAC only<br>provides the<br>software<br>automation of<br>the formula. |
| Intended<br>Users | Physicians and licensed<br>healthcare practitioners | The user may be an<br>experienced physician,<br>medical physicist,<br>technologist nurse or<br>other operator who has<br>been trained by an<br>authorized distributor or | Very Similar |
| Characteristic | Proposed Device:<br>Sirtex<br>SIR-Spheres Microspheres<br>Activity Calculator (SMAC) | Predicate: Hermes<br>Medical Solutions<br>Hybrid 3D<br>K181468 | Comparison |
| | | by Hermes Medical<br>Solutions. | |
| Device<br>Environment | Hospital, Clinic<br>Office Based Interventional<br>Suite (OBIS) | Hospital<br>Clinic | Similar:<br>Both the<br>proposed and<br>predicate devices<br>are intended to<br>be used in<br>licensed<br>healthcare<br>facilities |
| Operating<br>Platform | The SMAC system is<br>designed to be supported<br>by the last two versions of<br>the web browsers:<br>Chrome, Firefox, Safari,<br>Opera, Mobile Safari, and<br>Internet Explorer (IE)<br>mobile as well as Internet<br>Explorer 9+ and android<br>browser 2.3. | Microsoft Windows 7 & 10<br>(64 bit only) / Windows<br>Server | Similar<br>Proposed<br>device's<br>operating<br>platform has<br>been evaluated<br>for browser<br>compatibility. |
| Algorithms to<br>Perform<br>Calculations | Algorithm performs Y90<br>dose calculations based<br>upon the Body Surface<br>Area (BSA) model using<br>patient specific<br>characteristics. | Algorithm performs Y90<br>dose calculations based<br>upon the Body Surface<br>Area (BSA) model using<br>patient specific<br>characteristics. | Identical<br>The proposed<br>and predicate<br>devices utilize the<br>BSA Method to<br>perform dose<br>calculations. |
{6}------------------------------------------------
### H. Performance Data
The performance evaluation of the proposed SMAC Calculator included testing conducted in accordance to the following FDA Guidance Documents, domestic and international standards:
510(k) Premarket Notification Sirtex Medical Pty Ltd.
{7}------------------------------------------------
Results of this testing demonstrate safety and effectiveness of the proposed device and substantial equivalence.
### I. Substantially Equivalent / Conclusion
The Proposed device is determined to be substantially equivalent to the predicate device based on:
- The Intended Use and Indications for Use
- Operating principles/technology
- . Results of safety and performance testing
- Responses to questions posed in FDA 510 (k) "Substantial Equivalence" Decision Making . Flowchart
Predicate graph will load when search results are available.
Embedding visualization will load when search results are available.
PDF viewer will load when search results are available.
Loading panels...
Select an item from Submissions
Click any panel, subpart, regulation, product code, or device to see details here.
Section Matches
Results will appear here.
Product Code Matches
Results will appear here.
Special Control Matches
Results will appear here.
Loading collections...
Loading
My Alerts
You will receive email notifications based on the filters and frequency you set for each alert.
Sort by:
Create Alert
Search Filters
Agent Token
Create a read-only bearer token for Claude, ChatGPT, or other agents that can call HTTP APIs.
Copy this now. It will not be shown again.
Connected apps
Apps you authorized through browser sign-in. Disconnecting revokes their access immediately.
Learn the FDA Browser
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.