The T-FIX® 3DSI Joint Fusion System is intended for fixation of sacroiliac joint disruptions, and intended for sacrolliac joint fusion for conditions including; - sacroiliac joint disruptions - degenerative sacroiliitis - to augment immobilization and stabilization of the sacrolliac joint in skeletally mature patients undergoing sacropelvic fixation as part of a lumbar of thoracolumbar fusion and - acute, non-acute and non-traumatic fractures involving the sacroiliac joint
Device Story
T-FIX® 3DSI Joint Fusion System consists of cannulated, 3D-printed titanium alloy bone screws and associated surgical instruments. Device used by surgeons in clinical settings to treat sacroiliac joint dysfunction. Screws feature headless, zero-profile design; distal single-lead thread; proximal double-lead thread. Implanted across sacroiliac joint to anchor sacrum to pelvis, preventing joint motion. Provides structural stabilization for fusion. Benefits patient by immobilizing joint to alleviate pain and instability associated with disruptions or fractures.
Clinical Evidence
Bench testing only. Mechanical performance evaluated via static cantilever bending, axial pullout, torque to failure, and dynamic cantilever bending per ASTM F543 and ASTM F2193. Bacterial endotoxin testing performed per ANSI/AAMI ST72 and USP <161> to verify compliance with pyrogen limits.
Technological Characteristics
Materials: Ti-6Al-4V Grade 23 titanium alloy (ASTM 3001) with HA nano surface treatment. Design: Cannulated, 3D-printed, headless bone screws; single-lead distal thread, double-lead proximal thread. Energy source: None (mechanical). Connectivity: None. Sterilization: Not specified (standard).
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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June 24, 2022
Image /page/0/Picture/1 description: The image shows the logos of the Department of Health & Human Services and the U.S. Food & Drug Administration (FDA). The Department of Health & Human Services logo is on the left, featuring a stylized human figure. To the right is the FDA logo, with the letters "FDA" in a blue square and the words "U.S. FOOD & DRUG ADMINISTRATION" in blue text.
Cutting Edge Spine, LLC Kyle Kuntz Manager R&D 6012 Waxhaw Hwy Mineral Springs, North Carolina 28108
### Re: K214123
Trade/Device Name: T-FIX® 3DSI Joint Fusion System Regulation Number: 21 CFR 888.3040 Regulation Name: Smooth Or Threaded Metallic Bone Fixation Fastener Regulatory Class: Class II Product Code: OUR Dated: May 18, 2022 Received: May 20, 2022
### Dear Kyle Kuntz:
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
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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/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
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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# Indications for Use
510(k) Number (if known) K214123
Device Name T-FIX® 3DSI Joint Fusion System
Indications for Use (Describe)
The T-FIX® 3DSI Joint Fusion System is intended for fixation of sacroiliac joint disruptions, and intended for sacrolliac joint fusion for conditions including;
- sacroiliac joint disruptions
- degenerative sacroiliitis
- to augment immobilization and stabilization of the sacrolliac joint in skeletally mature patients undergoing sacropelvic fixation as part of a lumbar of thoracolumbar fusion and
- acute, non-acute and non-traumatic fractures involving the sacroiliac joint
Type of Use (Select one or both, as applicable)
X Prescription Use (Part 21 CFR 801 Subpart D)
Over-The-Counter Use (21 CFR 801 Subpart C)
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Image /page/3/Picture/0 description: The image shows the logo for Cutting Edge Spine (CES). The logo features a stylized design above the text. The design consists of three curved lines in orange, green, and blue, arranged in a spiral-like formation. Below the design, the letters "CES" are displayed in a bold, sans-serif font, with the words "CUTTING EDGE SPINE" written in a smaller font size underneath.
K214123 Page 1 of 3
# 5. 510(k) Summary
#### I. SUBMITTER
Date Prepared: 5-18-22
Applicant: Cutting Edge Spine, LLC 6012 Waxhaw Hwy Mineral Springs, NC 28108
| Contact Person: | Kyle Kuntz, Manager R&D |
|-----------------|------------------------------|
| Tel: | (704) 243-0892 |
| e-mail: | k.kuntz@cuttingedgespine.com |
## Application Correspondents:
| Contact Person: | Kyle Kuntz, Manager R&D<br>Tel: (704) 243-0892<br>e-mail: k.kuntz@cuttingedgespine.com |
|--------------------|----------------------------------------------------------------------------------------|
| Alternate Contact: | Brad Roof, Quality Manager |
Brad Roof, Quality Manager Tel: (704) 243-0892 e-mail: b.roof(@cuttingedgespine.com
#### II. DEVICE
| Trade Name: | T-FIX® 3DSI Joint Fusion System |
|-----------------------|----------------------------------------------------------------------------------------|
| Common or Usual Name: | Sacroiliac Joint Fixation Device |
| Classification Name: | Per 21 CFR as follows:<br>888.3040: Smooth or threaded metallic bone fixation fastener |
| Regulatory Class: | II |
| Product Codes: | OUR |
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Image /page/4/Picture/1 description: The image is a logo for Cutting Edge Spine (CES). The logo features a stylized, abstract design above the text. The abstract design consists of three curved lines in different colors: orange, green, and blue. Below the abstract design is the text "CES" in large, bold, black letters, with three horizontal lines stacked on top of each other to form the "E". Below "CES" is the text "CUTTING EDGE SPINE" in smaller, black letters.
#### III. PREDICATE DEVICES
| | 510(k)<br>Number | Device | Manufacturer |
|-------------------------|------------------|------------------------------------------|----------------------------|
| Primary<br>Predicate | K203138 | FIREBIRD SI Fusion<br>System | Orthofix Inc. |
| Additional<br>Predicate | K190025 | EVOL® SI Joint<br>Fusion System | Cutting Edge Spine,<br>LLC |
| Additional<br>Predicate | K181881 | Outlet Sacroiliac Joint<br>Fusion System | SIJ Surgical |
#### IV. DEVICE DESCRIPTION
The T-FIX® 3DSI Joint Fusion System, a line extension of the EVOL® -SI Fusion System (K190025), is intended to treat dysfunctions of the sacroiliac joint. The subject T-FIX® 3DSI Joint Fusion System includes cannulated, 3D printed, titanium alloy bone screws as well as a full complement of instruments to place them in the body. The subject T-FIX® screw is headless so that it may be implanted with a zero profile. The distal portion of the screw has a single lead thread and the proximal end has a double lead thread. The subject T-FIX® is designed to cross the sacroiliac joint anchoring the sacrum to the pelvis thereby preventing motion of the sacroiliac joint. The subject T-FIX® screws are made from a titanium alloy Ti-6A1-4V Grade 23 per ASTM 3001 and offered with a HA nano surface treatment.
#### INDICATIONS FOR USE V.
The T-FIX® 3DSI Joint Fusion System is intended for fixation of sacroiliac joint disruptions, and intended for sacroiliac joint fusion for conditions including;
- sacroiliac joint disruptions ●
- . degenerative sacroiliitis
- to augment immobilization and stabilization of the sacroiliac joint in skeletally mature patients undergoing sacropelvic fixation as part of a lumbar of thoracolumbar fusion and
- . acute, non-acute and non-traumatic fractures involving the sacroiliac joint
### COMPARISON OF TECHNOLOGICAL CHARACTERISTICS WITH VI. PREDICATE DEVICES
Documentation was submitted which demonstrated that the T-FIX® 3DSI Joint Fusion System, a line extension of the EVOL® -SI Fusion System (K190025) is substantially equivalent to the predicate devices based on a comparison of the following characteristics:
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Image /page/5/Picture/1 description: The image contains the logo for Cutting Edge Spine (CES). The logo features two curved lines in green and orange above a blue curved line. Below the curved lines, the letters CES are written in a bold, sans-serif font. Underneath the letters, the words "CUTTING EDGE SPINE" are written in a smaller font.
- Same FDA product codes
- Same Indications for Use
- . Same Structural Support Mechanism
- Same Surgical Approach
- Anatomical Region: SI Joint
- Same Implant Materials
- Similar Product Dimensions ●
- Equivalent Mechancial Performance ●
- All Available by prescription only
- All Made for single use ●
- Same Sterilization
- Similar Technology .
#### NON-CLINICAL AND CLINICAL PERFORMANCE TESTING VII.
### Mechanical Testing
Testing was performed for the T-FIX® 3DSI Joint Fusion System and demonstrated substantial equivalent performance to the identified predicates. The mechanical tests were performed in accordance to these test methods:
Static cantilever bending, Axial Pullout, Torque to Failure, and Dynamic cantilever bending
- ASTM F543
- ASTM F2193
In all, the biomechanical testing results demonstrate that the T-FIX® 3DSI Joint Fusion System is substantially equivalent to the predicate device.
# Non-Pyrogenicity Endotoxin Testing
The bacterial endotoxin test, also known as Limulus Amebocyte Lysate (LAL) on the worst case subject EVOL® -SI Joint Fusion System implants verify that the subject implants (line extension T-FIX® 3DSI) meet the 20 endotoxin units (EU)/device pyrogen limit specification, as outlined in ANSI/AAMI ST72, Bacterial endotoxins - Test methods, routine monitoring, and alternatives to batch testing and USP <161>, Transfusion and Infusion Assemblies and Similar Medical Devices.
#### CONCLUSIONS VIII.
Based upon a comparison of technological characteristics, intended use, design features, and mechanical performance, the T-FIX® 3DSI Joint Fusion System does not raise any new safety or efficacy concerns and has demonstrated substantial equivalence to the identified predicates.
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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 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).
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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.
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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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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.
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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.
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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.