The Triton™ Sacroiliac Joint Fixation system is intended for fixation of sacroiliac joint distruptions, and intended for sacroiliac joint fusion for conditions including; -sacroiliac joint disruptions, -degenerative sacroilititis -to augment immobilization and stabilization of the sacroiliac joint in skeletally mature patients undergoing sacropelvic fixation as part of a lumbar or thoracolumbar fusion and -Acute, non-acute, and non-traumatic fractures involving the sacroiliac joint
Device Story
Triton™ Sacroiliac Joint Fixation System consists of sterile, cannulated titanium alloy screws (8mm, 12mm, 14mm diameters) and non-sterile instrumentation. Screws feature 3 fluted channels for bone collection; 12mm and 14mm variants include open, porous-filled windows for autograft/allograft packing. Used by surgeons in clinical settings to achieve joint fixation and fusion. Implants provide mechanical stabilization of sacroiliac joint disruptions and fractures. Surgeon inserts screws to immobilize the joint, facilitating fusion; graft material packed into windows promotes bone growth. System benefits patients by stabilizing painful or unstable sacroiliac joints, potentially reducing pain and improving structural integrity of the pelvic region.
Clinical Evidence
No clinical data. Substantial equivalence supported by bench testing including static pull-out (ASTM F543), static torsion (ASTM F543), and static/dynamic cantilever testing (ASTM F2193). Biocompatibility assessed per ISO 10993-1.
Technological Characteristics
Implants: Ti-6Al-4V ELI titanium alloy (ASTM F3001, Class C). Instrumentation: medical-grade stainless steel, aluminum, plastics. Design: Cannulated screws with fluted channels and porous-filled windows. Sterilization: Sterile implants. Mechanical principle: Bone fixation fastener.
Indications for Use
Indicated for skeletally mature patients requiring sacroiliac joint fixation or fusion due to sacroiliac joint disruptions, degenerative sacroiliitis, acute/non-acute/non-traumatic fractures, or as augmentation for sacropelvic fixation during lumbar/thoracolumbar fusion.
Regulatory Classification
Identification
A smooth or threaded metallic bone fixation fastener is a device intended to be implanted that consists of a stiff wire segment or rod made of alloys, such as cobalt-chromium-molybdenum and stainless steel, and that may be smooth on the outside, fully or partially threaded, straight or U-shaped; and may be either blunt pointed, sharp pointed, or have a formed, slotted head on the end. It may be used for fixation of bone fractures, for bone reconstructions, as a guide pin for insertion of other implants, or it may be implanted through the skin so that a pulling force (traction) may be applied to the skeletal system.
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August 31, 2021
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ChoiceSpine, LLC Kim Finch Director of Regulatory Affairs 400 Erin Drive Knoxville, Tennessee 37919
Re: K211449
Trade/Device Name: Triton™ Sacroiliac Joint Fixation System Regulation Number: 21 CFR 888.3040 Regulation Name: Smooth Or Threaded Metallic Bone Fixation Fastener Regulatory Class: Class II Product Code: OUR Dated: July 29, 2021 Received: July 30, 2021
Dear Kim Finch:
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/cdrl/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
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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 (OS) 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 medical devices and radiation-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/cdrl-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
Colin O'Neill, M.B.E. Assistant Director DHT6B: Division of Spinal Devices OHT6: Office of Orthopedic Devices Office of Product Evaluation and Quality Center for Devices and Radiological Health
Enclosure
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#### DEPARTMENT OF HEALTH AND HUMAN SERVICES Food and Drug Administration
## Indications for Use
510(k) Number (if known) K211449
#### Device Name
Triton™ Sacroiliac Joint Fixation system
Indications for Use (Describe)
The Triton™ Sacroiliac Joint Fixation system is intended for fixation of sacroiliac joint distruptions, and intended for sacroiliac joint fusion for conditions including;
-sacroiliac joint disruptions,
-degenerative sacroilititis
-to augment immobilization and stabilization of the sacroiliac joint in skeletally mature patients undergoing sacropelvic fixation as part of a lumbar or thoracolumbar fusion and
-Acute, non-acute, and non-traumatic fractures involving the sacroiliac joint
> Prescription Use (Part 21 CFR 801 Subpart D)
Over-The-Counter Use (21 CFR 801 Subpart C)
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# 510(k) Summary
| Date: | July 7, 2021 |
|-------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Sponsor: | ChoiceSpine, LLC<br>400 Erin Drive<br>Knoxville, TN 37919 |
| Phone: | 865-246-3333 |
| Fax: | 865-246-3334 |
| Contact Person: | Kim Finch, Director of Regulatory Affairs |
| Proposed Proprietary<br>Trade Name: | Triton™ Sacroiliac Joint Fixation System |
| Product Class: | Class II |
| Classification Name: | Triton™ Sacroiliac Joint Fixation System<br>• 21 CFR 888.3040- Smooth or Threaded Metallic Bone Fixation Fastener |
| Device Product Code: | Triton™ Sacroiliac Joint Fixation System<br>• OUR |
| Purpose of Submission: | The purpose of this submission is to gain clearance for the new Triton™ Sacroiliac Joint Fixation System. |
| Device Description: | The Triton™ Sacroiliac Joint Fixation System is a multiple component system<br>consisting of non-sterile instruments and sterile, cannulated Ø8mm, Ø12mm<br>and Ø14mm Screws offered in multiple lengths. The Triton SI Screws are<br>manufactured from medical-grade titanium alloy (Ti-6Al-4V ELI) per ASTM<br>F3001, Class C. The implants feature 3 fluted channels for bone collection and<br>a tapered proximal tip. The Ø12mm and Ø14mm Screws feature multiple<br>open and porous-filled windows for packing and disbursement of autograft<br>and allograft materials. |
| Indications for Use: | The Triton™ Sacroiliac Joint Fixation System is intended for fixation of<br>sacroiliac joint disruptions, and intended for sacroiliac joint fusion for<br>conditions including;<br>• sacroiliac joint disruptions<br>• degenerative sacroiliitis<br>• to augment immobilization and stabilization of the sacroiliac joint in<br>skeletally mature patients undergoing sacropelvic fixation as part of a<br>lumbar or thoracolumbar fusion and<br>• Acute, non-acute, and non-traumatic fractures involving the sacroiliac<br>joint. |
| Materials: | The Triton™ Sacroiliac Joint Fixation System implants are composed of a<br>titanium alloy (Ti-6Al- 4V ELI per ASTM F3001, Class C). The system<br>instrumentation is made from medical grade stainless steels, aluminum, and |
| Predicate Devices: | Primary Predicate:<br>Orthofix Firebird SI Fusion System (K203138)<br>Additional Predicates:<br>Synthes Ø6.5mm Cannulated Screw (K021932)<br>Zyga Technology, Inc. SImmetry® Sacroiliac Joint Fusion System (K151818)<br>ChoiceSpine Hawkeye VBR System (K171686) |
| Non-clinical Testing: | Static Pull Out per ASTM F543<br>Static Torsion per ASTM F543<br>Static Cantilever per ASTM F2193<br>Dynamic Cantilever per ASTM F2193 |
| Conclusion/Technological Characteristics: | The only difference between the Triton™ Sacroiliac Joint Fixation System and<br>the predicate devices are device geometry. The differences in geometry are<br>not significant and would not adversely affect the use of the product. The<br>Triton™ System is substantially equivalent in material, size offerings,<br>classification, anatomical location, manufacturing and sterilization methods, |
| | surgical approach, principle of operation, indications for use, and mechanical<br>testing plan. The system components were assessed in accordance with ISO |
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plastics.
10993-1 and found substantially equivalent to the predicate devices.
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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.
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.