The MicroSelectron V3 is intended to enable an operator to apply, by remote control, a radionuclide source into the body (including Interstitial, Intracavitary, Intraluminal, Bronchial, Endovascular and Intra-operative) or to the surface of the body for radiation therapy.
Device Story
MicroSelectron V3 is a remote-controlled radionuclide applicator system for brachytherapy. It accepts treatment data manually or via import from a treatment planning system. The system uses a treatment unit with dual drive mechanisms and stepper motors to move a radiation source through up to 30 channels into applicators placed in or on the patient. It supports High Dose Rate (HDR) and Pulsed Dose Rate (PDR) delivery modes. Operated by clinicians in a clinical setting, the system includes a Treatment Control Station (TCS) for data entry and self-testing, a Treatment Control Panel (TCP) for execution, and optional remote units for monitoring. The system ensures safety through interlocks, self-diagnostics, and user authorization levels. By automating precise source positioning, it enables controlled radiation delivery to target tissues, potentially improving therapeutic outcomes while minimizing radiation exposure to staff.
Clinical Evidence
No clinical data provided. Substantial equivalence is based on bench testing and design verification of the modified system components, including the indexer, source drive mechanisms, and software functionality.
Technological Characteristics
Remote-controlled radionuclide applicator system. Components: Treatment Unit (TU) with dual stepper motors, position encoders, and battery backup; Treatment Control Panel (TCP); Treatment Control Station (TCS) computer. Supports up to 30 channels. Source dwell positions: 48 per channel. Step sizes: 2.5 mm or 10 mm. Connectivity: DICOM import/export. Software: System performs pre-treatment self-tests of connections, memory, battery, and indexer status.
Indications for Use
Indicated for patients requiring radiation therapy via interstitial, intracavitary, intraluminal, bronchial, endovascular, or intra-operative application, or surface application of a radionuclide source.
Regulatory Classification
Identification
A remote controlled radionuclide applicator system is an electromechanical or pneumatic device intended to enable an operator to apply, by remote control, a radionuclide source into the body or to the surface of the body for radiation therapy. This generic type of device may include patient and equipment supports, component parts, treatment planning computer programs, and accessories.
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Image /page/0/Picture/0 description: The image shows the word "Nucletron" in bold, black font, next to a square logo. The logo contains a black circle with two white circles on either side. The logo is enclosed in a black square.
NUCLETRON B.V.
Waardgelder 1 3905 TH Veenendaal 3900 AX Veenendaal P.O.Box 930 The Netherlands Phone +31 318 557133 Fax +31 318 550485
Department of Health and Human Services Centre of Device and Radiological Health Office of Device Evaluation Special 510(k) section
AUG 1 7 2006
# 510(K) SUMMARY OF SAFETY AND EFFECTIVENESS INFORMATION as required by section 807.92(c)
### Submitter of 510(k):
| Company name: | Nucletron Corporation |
|----------------------|---------------------------------------------------------|
| Registration number: | 1121753 |
| Address: | 8671 Robert Fulton Drive<br>Columbia, MD 21046 |
| Phone: | 410-312-4100 |
| Fax: | 410-312-4197 |
| Correspondent: | Lisa Dimmick<br>Director Assurance & Regulatory Affairs |
# Modified Device Name:
| Trade/Proprietary Name: | MicroSelectron V3 |
|-------------------------|--------------------------------------------------|
| Common/Usual Name: | Afterloader |
| Classification Name: | Remote controlled radionuclide applicator system |
| Classification: | 21Cfr892.5700 Class II |
| Product Code | JAQ |
# Legally Marketed Device(s)
Our device is substantially equivalent to the legally marketed predicate device cited in the table below:
| 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------<br>turer | --------------------------------------------------------------------------------------------------------<br>1000 - 100 - 100 - 100 - 100 - 100 - 100 - 100 - 100 - 100 - 100 - 100 - 100 - 100 - 100 - 100 - 100 - 100 - 100 - 100 - 100 - 100 - 100 - 100 - 100 - 100 - 100 - 100 - 100 -<br>Production |
|-------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Nucletron | Micro | KDA1024<br>1<br>------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
### Description:
The MicroSelectron V3 delivers a radiation dose distribution conforming to treatment data, which is either, manually entered at the workstation or imported from a treatment planning system.
For a treatment, a source and applicator are minimally required. Treatment can be administered via up to 30 applicators connected to 30 channels in the treatment unit. The dose distributions are achieved by sequentially letting the source dwell in required positions within the applicators,
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A channel has 48 possible dwell position has a number, whereby position 1 represents the farthest possible (distal) position from the treatment unit and 48 the closest (proximal) position. The step size, which is the minimum distance between the centres of consecutive dwell positions, can be set to 2.5 mm, or 10 mm. All channels that are used for a given treatment have the same step size. Treatment in a channel starts at the proximal programmed dwell position. When the dwell time in the proximal position has elapsed, treatment continues in the next programmed dwell position and so on until the last dwell position has been completed; whereupon, the procedure is repeated in the next programmed channel (if applicable).
The required dose distribution can be delivered according to two principles:
- The "high dose rate brachytherapy"principle (HDR), i.e. only one treatment cycle as . described above is given during a treatment session. The treatment is completed when the last programmed channel is completed.
- . The "pulsed dose rate brachytherapy" principle (PDR), i.e. treatment cycles (pulses) are given at regular intervals (periods). A pulse includes treatment in a number of channels (determined by the user) depending on the type of application. After having delivered one pulse, the system enters a quiescent state, the duration of which is equal to the period time minus the pulse time. The period time is the elapsed time between two consecutive pulses. The second pulse starts at the end of the first period time. The whole sequence as described above for the first pulse will then be repeated. The treatment is completed when the last pulse has been delivered.
The MicroSelectron V3 consists of the following main components:
#### . Treatment Unit (TU)
The Treatment Unit contains:
- Safe for the source
- . Dual drive mechanisms with two stepper motors
- Position encoders for the source assembly and the check cable, respectively .
- . Channel indexer
- . An electrical adjustment for the height of the treatment head
- Electronic control circuit boards .
- Battery pack and the power supply .
#### . Treatment Control Panel (TCP)
The Treatment Control Panel (TCP) transfers treatment data from the treatment control station to the treatment unit. After the Start button is pressed at the TCP, the treatment unit will execute treatment according to this data. The TCP monitors a treatment by exchanging status messages with the treatment unit and treatment control station.
#### . Treatment Control Station (TCS)
The Treatment Control Station is a computer with a monitor and a keyboard for user programmable functions, data entry, and detailed operational information. Once the Treatment Control Station is activated, and before any radiation treatment can be initiated, the system performs a self-test of all components which relate to safe operation. This diagnostic program checks the system connections, memory status, backup battery status, indexer status, Control Panel indicators, internal clock and audible alarm. For data integrity and security the system allows the definition of multiple types of users with different levels of authorization. This authorization is linked to the users password for the Treatment Control Station.
Patient and treatment data as well as applicator data is stored in the database at the treatment control station. The database stores information of treatment sessions (fractions or pulses) given a course of treatment.
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#### . Remote Control Unit (RCU) (optional for HDR)
The Remote Control Unit (RCU) is mounted outside the treatment room. After preparing a patient and programming the system, treatment can be started. Treatment can be interrupted and later resumed so that a nurse or physician can enter the treatment room and administer care to the patient. The unit also provides information about the treatment and system status.
#### . Nurse Station Display (Optional)
The Nurse Station Display (NSD) gives staff members the possibility to remotely monitor the treatment and system status. After selecting one of up to four treatment units, the information of the selected treatment unit is shown. The nurse station display works in the same way as the remote control unit for the treatment information, error information, settings, and audible alarm.
The radiotherapy treatment planning software is not part of this 510(k) submission. Applicators and Transfer Tubes as available for microSelectron-HDR/PDR (k953946 & k041933) are also applicable for the microSelectron V3 System.
The modifications to the previously cleared device K041933 are:
- Addition of HDR functionality, part of previously cleared device K902533 .
- . Increase of the number of channels of the indexer from 18 to 30.
- . Addition of DICOM import and export functionality
- . Increase of maximum source strength for treatment of patients from 40.000 uGy.m3h (10Ci) to 48.000 µGy.m2/h (12Ci)
### Intended use:
The modified device has the same intended use as the legally marketed predicate device cited:
The MicroSelectron V3 is intended to enable an operator to apply, by remote control, a radionuclide source into the body (including Interstitial, Intracavitary, Intraluminal, Bronchial, Endovascular and Intra-operative) or to the surface of the body for radiation therapy.
### Summary of technological considerations:
MicroSelectron V3 is substantially equivalent to the cleared predicate device, microSelectron PDR, 510(k)#: K041933.
Signature
3 APRIL 2006
Date
Name: Dick van Waes Title: Business Director Brachytherapy & Imaging Nucletron B.V. Veenendaal, The Netherlands
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Image /page/3/Picture/1 description: The image shows the logo for the U.S. Department of Health & Human Services. The logo is circular and contains the words "U.S. Department of Health & Human Services USA" around the perimeter. In the center of the circle is an abstract symbol that resembles an eagle or other bird.
Food and Drug Administration 9200 Corporate Blvd. Rockville MD 20850
AUG 1 7 2006
Ms. Lisa Dimmick Director Regulatory Affairs Nucletron Corporation 8671 Robert Fulton Drive COLUMBIA MD 21046
Re: K061354
Trade/Device Name: MicroSelectron V3 Regulation Number: 21 CFR 892.5700 Regulation Name: Remote controlled radionuclide applicator system Regulatory Class: II Product Code: JAQ Dated: July 17, 2006 Received: July 19, 2006
### Dear Ms. Dimmick:
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. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration.
If your device is classified (see above) into either class II (Special Controls) or class III (Premarket Approval), it may be subject to such additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 898. In addition, FDA may publish further announcements concerning your device in the Federal Register.
Image /page/3/Picture/10 description: The image is a circular logo with the letters "FDA" in the center. Above the letters, the numbers "1906-2006" are displayed. Below the letters, the word "Centennial" is written in a stylized font. Three stars are arranged below the word "Centennial". The logo appears to be a commemorative emblem for the FDA's centennial anniversary.
Promoting Public .
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Page 2 -
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); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820); and if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.
This letter will allow you to begin marketing your device as described in your Section 510(k) premarket notification. The FDA finding of substantial equivalence of your device to a legally marketed predicate device results in a classification for your device and thus, permits your device to proceed to the market.
If you desire specific advice for your device on our labeling regulation (21 CFR Part 801), please contact the Office of Compliance at one of the following numbers, based on the regulation number at the top of this letter:
| 21 CFR 876.xxx | (Gastroenterology/Renal/Urology) | 240-276-0115 |
|----------------|----------------------------------|--------------|
| 21 CFR 884.xxx | (Obstetrics/Gynecology) | 240-276-0115 |
| 21 CFR 894.xxx | (Radiology) | 240-276-0120 |
| Other | | 240-276-0100 |
Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21CFR Part 807.97). You may obtain other general information on your responsibilities under the Act from the Division of Small Manufacturers, International and Consumer Assistance at its toll-free number (800) 638-2041 or (240) 276-3150
or at its Internet address http://www.fda.gov/cdrl/industry/support/index.html.
Sincerely yours,
Nancy C. Hogdon
Nancy C. Brogdon Director, Division of Reproductive, Abdominal, and Radiological Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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# Indications for Use Statement
510(k) Number
Device Name
Indications for Use
K061354
MicroSelectron V3
The MicroSelectron V3 is intended to enable an operator to apply, by remove control, a radionvelide source into the body (including Interstitial, Intracavitary, Intraluminal, Bronchial, Endovascular and Intra-operative) or to the surface of the body for radiation therapy.
# PLEASE DO NOT VRITE BELOW THIS LINE - CONTINUE ON ANOTHER PAGE IF NEEDED
OR
Concurrence of CDRH, Office of Device Evaluation (ODE)
Prescription Use (Per 21 CFR 801.109)
Over-The-Counter Use
Nancy Brodon
(Division Sign-Off) Division of Reproductive, Abdominal, and Radiological Devices 510(k) Number _
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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.
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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.
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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.
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Reading rule for every project: how many summaries do you read in full?
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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.
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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.
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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.