The DePuy Synthes TOMOFIX Osteotomy System is intended for osteotomies, treatment of bone and joint deformities, fixation of fractures, and malalignment caused by injury or disease, such as osteoarthritis, of the distal femur and proximal tibia. Specifically, – The TOMOFIX Medial Proximal Tibia Plates are indicated for open- and closed-wedge osteotomies fixation of fractures, and malalignment caused by injury or disease, such as osteoarthritis, of the medial proximal tibia – The TOMOFIX Lateral Proximal Tibia Plates are indicated for open- and closed-wedge osteotomies fixation of fractures, and malalignment caused by injury or disease, such as osteoarthritis, of the lateral proximal tibia – The TOMOFIX Lateral Distal Femur Plates are indicated for open- and closed-wedge osteotomies fixation of fractures, and malalignment caused by injury or disease, such as osteoarthritis, of the lateral distal femur – The TOMOFIX Medial Distal Femur Plates are indicated for closed-wedge osteotomies fixation of fractures, and malalignment caused by injury or disease, such as osteoarthritis, of the medial distal femur
Device Story
System comprises five titanium plate families with locking and combination locking/compression holes; designed for stable fixation of osteotomies, fractures, and malalignments of distal femur and proximal tibia. Plates are anatomically contoured, available in right/left versions, and provided sterile or non-sterile. Used by orthopedic surgeons in clinical/surgical settings. Device provides mechanical stabilization of bone segments to facilitate healing and correct alignment. Benefits include restoration of joint function and reduction of deformity-related pain.
Clinical Evidence
Bench testing only. Mechanical performance demonstrated via axial testing, torsion testing, bending stiffness analysis (using ProEngineer CAD), and dynamic fatigue testing on plate-screw constructs mounted on sawbone models and POM-C test blocks.
Technological Characteristics
Titanium bone fixation plates with locking and combination locking/compression holes. Anatomically contoured. Mechanical performance validated via axial, torsion, and fatigue testing. No software or electronic components.
Indications for Use
Indicated for patients requiring osteotomies, fracture fixation, or correction of bone/joint deformities and malalignment (e.g., due to osteoarthritis) in the distal femur or proximal tibia.
Regulatory Classification
Identification
Single/multiple component metallic bone fixation appliances and accessories are devices intended to be implanted consisting of one or more metallic components and their metallic fasteners. The devices contain a plate, a nail/plate combination, or a blade/plate combination that are made of alloys, such as cobalt-chromium-molybdenum, stainless steel, and titanium, that are intended to be held in position with fasteners, such as screws and nails, or bolts, nuts, and washers. These devices are used for fixation of fractures of the proximal or distal end of long bones, such as intracapsular, intertrochanteric, intercervical, supracondylar, or condylar fractures of the femur; for fusion of a joint; or for surgical procedures that involve cutting a bone. The devices may be implanted or attached through the skin so that a pulling force (traction) may be applied to the skeletal system.
Synthes Large Fragment Dynamic Compression Locking System (K000682)
Submission Summary (Full Text)
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Food and Drug Administration 10903 New Hampshire Avenue Document Control Center - WO66-G609 Silver Spring, MD 20993-0002
August 29, 2014
Synthes (USA) Products LLC Ms. Kara A. R. Elkin Regulatory Affairs Specialist 1301 Goshen Parkway West Chester, Pennsylvania 19380
Re: K141796
Trade/Device Name: DePuy Synthes TOMOFIX Osteotomy System Regulation Number: 21 CFR 888.3030 Regulation Name: Single/multiple component metallic bone fixation appliance and accessories Regulatory Class: Class II Product Code: HRS Dated: August 1, 2014 Received: August 4, 2014
Dear Ms. Elkin:
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. 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 (reporting of medical device-related adverse events) (21 CFR 803); good manufacturing practice requirements as set
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Page 2 – Ms. Kara A.R. Elkin
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. If you desire specific advice for your device on our labeling regulation (21 CFR Part 801), please contact the Division of Industry and Consumer Education at its toll-free number (800) 638-2041 or (301) 796-7100 or at its Internet address
http://www.fda.gov/MedicalDevices/Resourcesfor You/Industry/default.htm. 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
http://www.fda.gov/MedicalDevices/Safety/ReportaProblem/default.htm for the CDRH's Office of Surveillance and Biometrics/Division of Postmarket Surveillance.
You may obtain other general information on your responsibilities under the Act from the Division of Industry and Consumer Education at its toll-free number (800) 638-2041 or (301) 796-7100 or at its Internet address
http://www.fda.gov/MedicalDevices/ResourcesforYou/Industry/default.htm.
Sincerely yours,
# Lori A. Wiggins -S
for Mark N. Melkerson Director Division of Orthopedic Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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See PRA Statement below.
Form Approved: OMB No. 0910-0120
Expiration Date: January 31, 2017
# Indications for Use
510(k) Number (if known)
## K141796
Device Name
DePuy Synthes TOMOFIX Osteotomy System
# Indications for Use (Describe)
The DePuy Synthes TOMOFIX Osteotomy System is intended for osteotomies, treatment of bone and joint deformities, fixation of fractures, and malalignment caused by injury or disease, such as osteoarthitis, of the distal femur and proximal tibia.
Specifically.
- The TOMOFIX Medial Proximal Tibia Plates are indicated for open- and closed-wedge osteotomies fixation of fractures, and malalignment caused by injury or disease, such as osteoarthritis, of the medial proximal tibia
- The TOMOFIX Lateral Proximal Tibia Plates are indicated for open- and closed-wedge osteotomies, fixation of fractures and malalignment caused by injury or disease. such as osteoarthritis, of the lateral proximal tibia
- The TOMOFIX Lateral Distal Femur Plates are indicated for open-and closed-wedge osteotomies, fixation of fractures and malalignment caused by injury or disease, such as osteoarthritis, of the lateral distal femur
- The TOMOFIX Medial Distal Femur Plates are indicated for closed-wedge osteotomies, fixation of fractures and malalignment caused by injury or disease, such as osteoarthritis, of the medial distal femur
Type of Use (Select one or both, as applicable)
Prescription Use (Part 21 CFR 801 Subpart D)
Over-The-Counter Use (21 CFR 801 Subpart C)
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Concurrence of Center for Devices and Radiological Health (CDRH) (Signature)
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______________________________________________________________________________________________________________________________________________________________________________
| 5.0 | 510(k) Summary | Page 1 of 3 |
|---------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------|
| Sponsor: | DePuy Synthes<br>1301 Goshen Parkway<br>West Chester, PA 19380 | |
| | Phone: (610) 719-1239<br>Fax: (484) 356-9682 | |
| | Contact Person: Kara A. R. Elkin<br>Date Prepared: August 1, 2014 | |
| Device Name: | DePuy Synthes TOMOFIX Osteotomy System | |
| Classification: | Product Code - HRS, Plate, Fixation, Bone, Class II, §888.3030 –<br>Single / multiple component metallic bone fixation appliance and<br>accessories. | |
| Predicate Devices: | Synthes TOMOFIX Medial Distal Femur Plates (K081353) | |
| | Synthes TOMOFIX Osteotomy System (K023941) | |
| | Synthes Large Fragment Dynamic Compression Locking System<br>(K000682) | |
| Device Description: | The DePuy Synthes TOMOFIX Osteotomy System consists of five<br>different titanium plate families with locking and combination<br>locking/compression holes. This system features plates designed to<br>provide stable fixation of osteotomies of the distal femur and<br>proximal tibia. | |
| | The DePuy Synthes TOMOFIX Medial Distal Femur Plates are part<br>of the DePuy Synthes TOMOFIX Osteotomy System used for closed<br>wedge femoral osteotomies. The subject plates are anatomically<br>contoured to fit the medial distal femur, are available in right and left<br>versions, as well as sterile and non-sterile. | |
| Intended Use: | The DePuy Synthes TOMOFIX Osteotomy System is intended for<br>osteotomies, treatment of bone and joint deformities, fixation of<br>fractures, and malalignment caused by injury or disease, such as<br>osteoarthritis, of the distal femur and proximal tibia. | |
| | Specifically,<br>– The TOMOFIX Medial Proximal Tibia Plates are indicated<br>for open- and closed-wedge osteotomies fixation of fractures,<br>and malalignment caused by injury or disease, such as<br>osteoarthritis, of the medial proximal tibia<br>– The TOMOFIX Lateral Proximal Tibia Plates are indicated<br>for open- and closed-wedge osteotomies fixation of fractures, | |
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and malalignment caused by injury or disease, such as osteoarthritis, of the lateral proximal tibia
- The TOMOFIX Lateral Distal Femur Plates are indicated for open- and closed-wedge osteotomies fixation of fractures, and malalignment caused by injury or disease, such as osteoarthritis, of the lateral distal femur
- The TOMOFIX Medial Distal Femur Plates are indicated for closed-wedge osteotomies fixation of fractures, and malalignment caused by injury or disease, such as osteoarthritis, of the medial distal femur
Substantial The intent of this submission is to update the indications for use Equivalence: statement of the DePuy Synthes TOMOFIX Osteotomy System (cleared under K023941) by specifying osteotomy type (open or closed) and specific anatomical region indicated for each plate family in the system. Information has been provided to support the use of the DePuy Synthes TOMOFIX Osteotomy System for the proposed indications to support a substantially equivalent decision in comparison to the predicate Synthes TOMOFIX Osteotomy System as cleared under K023941.
> It is also the intent of this submission to modify the design of the DePuy Synthes TOMOFIX Medial Distal Femur Plate. Information presented supports substantial equivalence of the DePuy Synthes TOMOFIX Medial Distal Femur Plate to the predicate devices, Synthes TOMOFIX Medial Distal Femur Plates (K081353), Synthes TOMOFIX Osteotomy System (K023941) and Synthes Large Fragment Dynamic Compression Locking System (K000682). The proposed plates have similar indications for use, design characteristics, materials, and incorporate the same fundamental technology.
Performance Data
Static and dynamic construct testing was completed for the plates included in the DePuy Synthes TOMOFIX Osteotomy System in order to demonstrate comparable mechanical performance to the predicates. The mechanical testing was designed to assess the stiffness and fatigue strength of the subject devices. The following tests and analyses were performed:
- Axial Testing conducted by mounting the plates on an ● osteotomized sawbone femur model and subjecting the plates to an axial load
- Torsion Testing - conducted by mounting the plates on an osteotomized sawbone femur model and subjecting the plates to a torsional load
- Bending Stiffness - ProEngineer CAD software was used to calculate and compare stiffness properties in the critical cross section of the plates
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- . Dynamic (Fatigue) Testing – conducted by mounting the plate-screw constructs on POM-C test blocks with a milled surface to match the bottom of the plate and introducing a cyclical axial force
The results of the mechanical testing and engineering analyses demonstrate substantial equivalence.
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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.
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?
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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.
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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.
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.
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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.