K141942 · Centinel Spine, Inc. · OVD · Nov 7, 2014 · Orthopedic
Device Facts
Record ID
K141942
Device Name
MIDLINE II TI
Applicant
Centinel Spine, Inc.
Product Code
OVD · Orthopedic
Decision Date
Nov 7, 2014
Decision
SESE
Submission Type
Traditional
Regulation
21 CFR 888.3080
Device Class
Class 2
Attributes
Therapeutic
Indications for Use
The MIDLINE II™ / MIDLINE II -Ti™ is indicated for use with autogenous bone graft in patients with degenerative disc disease (DDD) at one or two contiguous levels from L2 to S1. These DDD patients may also have up to Grade I Spondylolisthesis or retrolisthesis at the involved levels. DDD is defined as discogenic back pain with degeneration of the disc confirmed by history and radiographic studies. These patients should be skeletally mature and have had six months of non-operative treatment. Patients with previous non-fusion spinal surgery at the treated level may be treated. These implants may be implanted via a laparoscopic or an open anterior approach. The MIDLINE II™ / MIDLINE II -Ti™ is a stand-alone system intended to be used with the bone screws provided and requires no additional supplementary fixation systems. The MIDLINE II™ / MIDLINE II -Ti™ system must be used with bone grafting material (autograft only).
Device Story
Intervertebral body fusion device; stand-alone system; used for spinal fusion at L2-S1 levels. Device implanted via laparoscopic or open anterior approach; secured with provided titanium unicortical cancellous bone screws; requires no supplemental fixation. Input: autogenous bone graft (autograft only). Output: structural support for intervertebral space to facilitate fusion. Used by surgeons in clinical/OR settings. Benefits: stabilization of spinal segment in DDD patients; reduction of discogenic pain. Device modification includes addition of titanium coating and lordotic angle options.
Clinical Evidence
Bench testing only. No clinical data presented. Mechanical testing included static compression, static compression-shear, dynamic compression, dynamic torsion, dynamic compression-shear, expulsion, and subsidence per ASTM F2077-11 and F2267-04. Coating validation included static tensile bonding, shear bonding, and Taber abrasion testing.
Technological Characteristics
Radiolucent PEEK-OPTIMA LT1 or Zeniva ZA PEEK (ASTM F2026); Tantalum X-ray markers (ASTM F560); optional plasma-sprayed commercially pure titanium coating (ASTM F1580). Titanium alloy (Ti-6Al-4V, ASTM F136) bone screws. Dimensions: 11-21mm height, 30-42mm width, 24-30.2mm length, 8°-20° lordotic angles. Sterile.
Indications for Use
Indicated for skeletally mature patients with degenerative disc disease (DDD) at one or two contiguous levels from L2 to S1, including those with up to Grade I Spondylolisthesis or retrolisthesis. Patients must have discogenic back pain confirmed by history/radiography and have failed six months of non-operative treatment. Includes patients with prior non-fusion spinal surgery at the treated level.
Regulatory Classification
Identification
An intervertebral body fusion device is an implanted single or multiple component spinal device made from a variety of materials, including titanium and polymers. The device is inserted into the intervertebral body space of the cervical or lumbosacral spine, and is intended for intervertebral body fusion.
Special Controls
*Classification.* (1) Class II (special controls) for intervertebral body fusion devices that contain bone grafting material. The special control is the FDA guidance document entitled “Class II Special Controls Guidance Document: Intervertebral Body Fusion Device.” See § 888.1(e) for the availability of this guidance document.(2) Class III (premarket approval) for intervertebral body fusion devices that include any therapeutic biologic (e.g., bone morphogenic protein). Intervertebral body fusion devices that contain any therapeutic biologic require premarket approval.
(c)
*Date premarket approval application (PMA) or notice of product development protocol (PDP) is required.* Devices described in paragraph (b)(2) of this section shall have an approved PMA or a declared completed PDP in effect before being placed in commercial distribution.
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Food and Drug Administration 10903 New Hampshire Avenue Document Control Center - WO66-G609 Silver Spring, MD 20993-0002
November 7, 2014
Centinel Spine, Incorporated % Mr. Justin Eggleton Director, Spine Regulatory Affairs Musculoskeletal Clinical Regulatory Advisers, LLC 1331 H. Street Northwest, 12th Washington, District of Columbia 20005
Re: K141942
Trade/Device Name: MIDLINE IITM / MIDLINE II-TiTM Regulation Number: 21 CFR 888.3080 Regulation Name: Intervertebral body fusion device Regulatory Class: Class II Product Code: OVD Dated: October 8, 2014 Received: October 9, 2014
Dear Mr. Eggleton:
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 - Mr. Justin Eggleton
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.
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" (21CFR 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 vours.
## Mark N. Melkerson -S
Mark N. Melkerson Director Division of Orthopedic Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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## Indications for Use
510(k) Number (if known) K141942
Device Name MIDLINE IITM / MIDLINE II-TiTM
#### Indications for Use (Describe)
The MIDLINE II™ / MIDLINE II -Ti™ is indicated for use with autogenous bone graft in patients with degenerative disc disease (DDD) at one or two contiguous levels from L2 to S1. These DDD patients may also have up to Grade I Spondylolisthesis or retrolisthesis at the involved levels. DDD is defined as discogenic back pain with degeneration of the disc confirmed by history and radiographic studies. These patients should be skeletally mature and have had six months of non-operative treatment. Patients with previous non-fusion spinal surgery at the treated level may be treated. These implants may be implanted via a laparoscopic or an open anterior approach.
The MIDLINE II™ / MIDLINE II -Ti™ is a stand-alone system intended to be used with the bone screws provided and requires no additional supplementary fixation systems.
The MIDLINE II™ / MIDLINE II -Ti™ system must be used with bone grafting material (autograft only).
Type of Use (Select one or both, as applicable)
2 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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# 510(k) Summary
| Device Trade Name: | MIDLINE IITM / MIDLINE II-TiTM |
|------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Manufacturer: | Centinel Spine, Inc.<br>900 Airport Road, Suite 3B<br>West Chester, PA 19380 |
| Contact: | Mr. John Parry<br>Development Manager<br>Phone: (484) 887.8813<br>J.Parry@centinelspine.com |
| Prepared by: | Justin Eggleton<br>Musculoskeletal Clinical Regulatory Advisers, LLC<br>1331 H Street NW, 12th Floor<br>Washington, DC 20005<br>Phone: (202) 552-5800<br>Fax: (202) 552-5798 |
| Date Prepared: | October 8, 2014 |
| Classifications: | 21 CFR §888.3080, Intervertebral body fusion device |
| Class: | II |
| Product Codes: | OVD |
| Primary Predicate: | K133286 (MIDLINETM) |
| Additional Predicates: | STALIF MIDLINE™ (K101301), Aesculap SIBD XP Spinal<br>System (K111122), SpineSmith Cynch Spinal System (K102090),<br>NuVasive Brigade Hyperlodotic System (K123045), Theken Spine<br>VuaPOD (K101310) |
| Reference Device: | K133200 (STALIF C® Ti) |
### Indications For Use:
The MIDLINE III™ / MIDLINE II-Ti™ is indicated for use with autogenous bone graft in patients with degenerative disc disease (DDD) at one or two contiguous levels from L2 to S1. These DDD patients may also have up to Grade I Spondylolisthesis or retrolisthesis at the involved levels. DDD is defined as discogenic back pain with degeneration of the disc confirmed by history and radiographic studies. These patients should be skeletally mature and have had six months of non-operative treatment. Patients with previous non-fusion spinal surgery at the
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treated level may be treated. These implants may be implanted via a laparoscopic or an open anterior approach.
The MIDLINE II™ / MIDLINE II-Ti™ is a stand-alone system intended to be used with the bone screws provided and requires no additional supplementary fixation systems.
The MIDLINE IIIM / MIDLINE II-Ti™ system must be used with bone grafting material (autograft only).
## Device Description:
The MIDLINE III™ / MIDLINE II-Ti™ is a radiolucent intervertebral body fusion device manufactured from either PEEK-OPTIMA® LT1 supplied by Invibio or Zeniva ZA PEEK supplied by Solvay per ASTM F2026 with three metallic X-ray markers manufactured from unalloyed Tantalum (ASTM F560) and plasma sprayed with optional commercially pure titanium (CPT) per ASTM F1580. The device is secured with titanium (Ti-6A1-4V per ASTM F136) unicortical cancellous bone screws provided and is intended to be used without supplemental fixation. The purpose of this 510(k) is to modify the MIDLINE™ (K133286) to include a titanium coating (ASTM F1580-12) and an additional lordotic option.
The MIDLINE II™ / MIDLINE II-Ti™ is provided in 11-21mm heights, 30-42mm widths, 24-30.2mm lengths, and lordotic angles ranging from 8°-20°. The devices are provided sterile.
### Predicate Device:
The subject MIDLINE IIIM / MIDLINE II-Ti™ device is substantially equivalent to predicate MIDLINE™ and STALIF MIDLINE™ devices (K133286, K101301) with respect to indications, design, function, and performance.
### Substantial Equivalence:
Testing performed indicate that the MIDLINE II™ / MIDLINE II-Ti™ is as mechanically sound as predicate devices. Testing included static compression, static compressionshear, dynamic compression, dynamic torsion, dynamic compression-shear, expulsion, and subsidence per ASTM F2077-11 and F2267-04. In addition, coating validation testing was performed, including static tensile bonding, shear bonding, and Taber abrasion testing. The results demonstrate that the acceptance criteria defined by predicate device performance were met.
### Conclusion:
Centinel Spine provided sufficient information to demonstrate the MIDLINE III™ / MIDLINE II-Ti™ is substantially equivalent to predicate MIDLINE™ and STALIF MIDLINE™ devices (K133286, K101301).
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.
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.