The SLT Venous Fiber is intended for use in endovascular coagulation of the greater saphenous vein of the thigh in patients with superficial vein reflux.
Device Story
SLT Venous Fiber Delivery Systems consist of flexible optical fibers (Flat, Conical, or Diffuser models) designed to deliver laser energy for endovascular coagulation. The device is inserted into the vein via a catheter or cannula. The Diffuser fiber provides a uniform cylindrical coagulation zone; the Conical fiber provides a focused radial coagulation zone; the Flat fiber provides forward-directed high-energy density. The fibers connect to compatible laser systems (810nm-1064nm depending on model) via proprietary or SMA-905 connectors. Used by physicians in clinical settings to treat superficial vein reflux by thermally coagulating the greater saphenous vein. The output is laser energy that induces thermal tissue interaction, resulting in vein closure. The device is sterile and for single use only.
Clinical Evidence
No clinical data provided. Substantial equivalence is supported by animal study results demonstrating safe and effective performance comparable to the predicate devices.
Technological Characteristics
Flexible optical fibers with three tip geometries: Diffuser (cylindrical), Conical (radial), and Flat (forward). Compatible with laser wavelengths 810nm-1064nm. Connectors: SLT proprietary or SMA-905. Materials are biocompatible per USP Class VI and ISO 10993-1/4. Sterilized for single use.
Indications for Use
Indicated for endovascular coagulation of the greater saphenous vein of the thigh in patients with superficial vein reflux.
Regulatory Classification
Identification
(1) A carbon dioxide laser for use in general surgery and in dermatology is a laser device intended to cut, destroy, or remove tissue by light energy emitted by carbon dioxide.(2) An argon laser for use in dermatology is a laser device intended to destroy or coagulate tissue by light energy emitted by argon.
Predicate Devices
Diomed 810nm Surgical Lasers and EVLT Procedure Kit (K012398)
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Image /page/0/Picture/0 description: The image contains a logo for Surgical Laser Technologies. The logo has the letters SLT in bold black font on the left side of the image. To the right of the letters are the words Surgical, Laser, and Technologies stacked on top of each other in a smaller font.
147 Keystone Drive Montgomeryville, Pennsylvania 18936-9638
Tel: (215) 619-3600 (800) 366-4758 Fax: (215) 619-3209
AND AND ALL BA
JAN 2 7 2003
7.
## 510(k) SUMMARY SLT Venous Fiber Delivery Systems
K023624
This 510(k) summary of safety and effectiveness information for the SLT Venous Fiber Delivery Systems is being submitted in accordance with the requirements of SMDA 1990 and 21 CFR 807.92.
The assigned 510(k) number is:
Surgical Laser Technologies, Inc. Applicant:
Surgical Laser Technologies, Inc. Address: 147 Keystone Drive Montgomeryville, PA, 18936
Davis Woodward Contact Person: Vice President, CFO
(215) 619 3600 Telephone: (215) 619 3209 (fax)
Preparation Date: October 9, 2002
"SLT Venous Fiber Delivery Systems", comprised of the following models: Proprietary Device Name:
| Model Name | Model Number |
|--------------------------------|--------------|
| Venous Flat Fiber, SLT | 0041-6772 |
| Venous Flat Fiber, SMA-905 | 0041-6781 |
| Venous Conical Fiber, SLT | 0041-6752 |
| Venous Conical Fiber, SMA-905 | 0041-6761 |
| Venous Diffuser Fiber, SLT | 0041-6912 |
| Venous Diffuser Fiber, SMA-905 | 0041-6921 |
Surgical Laser Fiber Delivery System Common Name:
Laser surgical instrument for use in general and plastic surgery and in Classification dermatology (see 21 CFR 878.4810). Name:
Product Code: GEX
79, General and Plastic Surgery Panel:
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| Legally Marketed<br>Predicate Devices: | Diomed 810nm Surgical Lasers and EVLT Procedure Kit (K012398)<br>VNUS® Closure™ System (K003092)<br>VNUS® Closure™ System (K982816)<br>VNUS® Closure™™ System (K974521)<br>Ceralas D10-60 810nm Diode Laser System and ELVS Procedure Kit<br>(K020835)<br>Ceralas D Diode 980nm Laser System (K013691) |
|----------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Description of the<br>Device: | SLT Venous FDS products include the Venous Diffusing Fiber, the Venous<br>Conical Fiber, and the Venous Flat Fiber.<br><br>SLT Venous Diffuser Fibers are flexible fibers with an active diffusing<br>portion that diffuses the laser energy in a uniform pattern about its active<br>diffusing length, resulting in a cylindrical or elongated spheroidal zone of<br>coagulation.<br><br>SLT Venous Conical Fibers splay the laser energy radially at their distally<br>conical portion, providing a much smaller and more focused coagulation<br>zone than the Venous Diffuser Fiber.<br><br>SLT Venous Flat Fibers direct the laser energy forward from their distally<br>flat end, providing the highest energy density of the three SLT Venous<br>Fibers.<br><br>SLT Venous Fibers are available with SLT proprietary connectors (to fit<br>SLT Contact Laser™ Systems) and SMA-905 connectors (to fit lasers with<br>standard SMA-905 launch interfaces).<br><br>SLT Venous Diffuser Fibers are compatible for use only with lasers having<br>wavelengths between 980nm and 1064nm.<br><br>SLT Venous Conical and Flat Fibers are compatible for use with lasers<br>having wavelengths between 810nm and 1064nm.<br><br>SLT Venous Fibers are flexible and therefore, when used for endovascular<br>applications, a catheter, cannula, or similar device should be used to insert<br>the fiber into the vein.<br><br>SLT Venous Fiber products are sold sterile, and are intended for single use<br>only. |
| Indications for Use: | The SLT Venous Fiber is intended for use in endovascular coagulation of<br>the greater saphenous vein of the thigh in patients with superficial vein<br>reflux. |
| Substantial<br>Equivalence: | The intended use, method of tissue interaction, specifications, clinical<br>technique and animal study results of the SLT Venous Conical and Flat<br>Fiber Delivery Systems are the same or very similar to those of the legally<br>marketed fiber delivery system in the Diomed 810 Surgical Lasers and<br>EVLT™ Procedure Kit (K012398), to the legally marketed Ceralas D10-60<br>810nm Diode Laser System and ELVS Procedure Kit (K020835), and to the<br>legally marketed Ceralas D Diode 980nm Laser System (K013691). |
| | The intended use, method of tissue interaction (thermal), clinical technique<br>and animal study results of the SLT Venous Diffuser Fiber Delivery System<br>is the same or very similar to those of the legally marketed VNUS®<br>Closure™ System (K003092, K982816, K974521). |
| | The intended use, method of tissue interaction (thermal), clinical technique<br>and animal study results of the SLT Venous Flat Fiber Delivery System is<br>the same or very similar to those of the legally marketed Ceralas D Diode<br>980nm Laser System (K013691). |
| Safety and<br>Effectiveness: | Animal studies have demonstrated the substantially equivalent safe and<br>effective performance of the SLT Venous Conical and Flat Fiber Delivery<br>Systems with the legally marketed fiber delivery system in the Diomed 810<br>Surgical Lasers and EVLT™ Procedure Kit (K012398) to the legally<br>marketed Ceralas D10-60 810nm Diode Laser System and ELVS Procedure<br>Kit (K020835), and to the legally marketed Ceralas D Diode 980nm Laser<br>System (K013691). |
| | Animal studies have demonstrated the substantially equivalent safe and<br>effective performance of the SLT Venous Flat Fiber Delivery System with<br>the legally marketed VNUS® Closure™ System (K003092, K982816,<br>K974521). |
| | The intended use, method of tissue interaction (thermal), clinical technique<br>and animal study results of the SLT Venous Flat Fiber Delivery System is<br>the same or very similar to those of the legally marketed legally marketed<br>Ceralas D Diode 980nm Laser System (K013691). |
| | The materials used in the SLT Venous Fiber Delivery Systems are<br>biocompatible. |
| | Toxological testing and evaluation per both USP Class VI and ISO 10993-1,<br>including hemocompatibility testing per ISO 10993-4, were successfully<br>performed. |
| Conclusion: | Based on the foregoing, Surgical Laser Technologies, Inc., believes that the<br>SLT Venous Fiber Delivery Systems are substantially equivalent to and as<br>safe and effective as the legally marketed fiber delivery system in the<br>Diomed 810 Surgical Lasers and EVLT™ Procedure Kit (K012398), the<br>legally marketed VNUS® Closure™ System (K003092, K982816,<br>K974521), the legally marketed Ceralas D10-60 810nm Diode Laser System<br>and ELVS Procedure Kit (K020835), and the Ceralas D Diode 980nm Laser<br>System (K013691). |
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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 text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" around the perimeter. Inside the circle is an abstract symbol that resembles an eagle or bird-like figure, composed of three curved lines.
Public Health Service
Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850
JAN 2 7 2003
Surgical Laser Technologies, Inc. Davis Woodward Vice President, CFO 147 Keystone Drive Montgomervville, Pennsylvania 18936
Re: K023624
Trade/Device Name: SLT Venous Fiber Delivery Systems Regulation Number: 878.4810 Regulation Name: Laser surgical instrument for use in general and plastic Surgery and in dermatology Regulatory Class: Class II Product Code: GEX Dated: October 25, 2002 Received: October 29, 2002
Dear Mr. Woodward:
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 (PMA), 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.
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
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Page 2 - Mr. Davis Woodward
(21 CFR Part 807); labeling (21 CFR Part 801); good manufacturing practice requirements as set forth in the quality systems (OS) 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 (301) 594-4659. Also, please note the regulation entitled. "Misbranding by reference to premarket notification" (21CFR Part 807.97). Other general information on your responsibilities under the Act may be obtained from the Division of Small Manufacturers, International and Consumer Assistance at its toll-free number (800) 638-2041 or (301) 443-6597 or at its Internet address
http://www.fda.qov/cdrh/dsma/dsmamain.html
Sincerely yours.
Miriam C. Provost
for Celia M. Witten, Ph.D., M.D. Director Division of General, Restorative and Neurological Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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## 5. STATEMENT OF INDICATIONS FOR USE
| Applicant: | Surgical Laser Technologies, Inc.<br>147 Keystone Drive<br>Montgomeryville, PA, 18936<br>Establishment registration number: 2523356 |
|---------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------|
| 510(k) Number (if known): | K023624 |
| Device Name: | SLT Venous Fiber Delivery Systems |
| Indications for Use: | The SLT Venous Fiber is intended for use in endovascular coagulation of the greater saphenou vein of the thigh in patients with superficial vein reflux. |
(PLEASE DO NOT WRITE BELOW THIS LINE - CONTINUE ON ANOTHER PAGE IF NEEDED)
Concurrence of CDRH, Office of Device Evaluation (ODE)
Prescription Use
(Per 21 CFR 801.109) √
OR
Over-The-Counter Use _________________________________________________________________________________________________________________________________________________________
saphenous
Miriam C. Provost
Division Sign-Off) Division of General, Restorative and Neurological Devices
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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.
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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.