Cranial PSI Accessories are indicated for use as accessories to the OSSDSIGN Cranial PSI for the reconstruction of cranial defects. They are indicated for non-load bearing applications for patients in whom cranial growth is complete and for use with an intact dura, with or without duraplasty.
Device Story
OSSDSIGN Cranial PSI Accessories are patient-specific, additively manufactured (PA2200 polyamide) tools designed to support the implantation of the OSSDSIGN Cranial PSI. The accessory suite includes: Anatomical Models (Original/Modified) for visual/tactile orientation; a Plastic Drawing Guide for marking bone removal sites; and a Cranial Implant Trial for confirming implant fit, fixation, and soft tissue coverage. All accessories are derived from the same patient-specific CT image data as the parent implant. Used in clinical settings by physicians; models are non-sterile; guides and trials are provided sterile. These tools facilitate accurate surgical planning and placement of the cranial implant, potentially improving surgical outcomes and fit.
Clinical Evidence
Bench testing only. Biocompatibility testing performed per ISO 10993-5 (cytotoxicity), ISO 10993-11 (systemic toxicity), ISO 10993-10 (sensitization/irritation), USP 40-NF 35 (pyrogen), and ISO 10993-4 (hemolysis). Analytical extractable chemical analysis performed per ISO 10993-18. Performance testing included deformation testing (<1mm deviation), simulated clinical use for particle generation (no visible particles), and dimensional integrity verification.
Technological Characteristics
Additively manufactured PA2200 polyamide. Patient-specific dimensions derived from CT data. Non-sterile (models) and sterile (guides/trials) configurations. No active energy source. Software-assisted design based on patient anatomy.
Indications for Use
Indicated for patients with complete cranial growth requiring cranial defect reconstruction using OSSDSIGN Cranial PSI; non-load bearing applications; requires intact dura (with/without duraplasty).
Regulatory Classification
Identification
A preformed nonalterable cranioplasty plate is a device that is implanted in a patient to repair a skull defect and is constructed of a material, e.g., stainless steel or vitallium, that cannot be altered or reshaped at the time of surgery without changing the chemical behavior of the material.
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Image /page/0/Picture/0 description: The image contains the logo of the U.S. Food and Drug Administration (FDA). On the left is the Department of Health & Human Services logo. To the right of that is the FDA logo, which is a blue square with the letters "FDA" in white. To the right of the blue square is the text "U.S. FOOD & DRUG ADMINISTRATION" in blue.
OSSDSIGN AB % David Weissburg Principal Weissburg Associates 300 2nd Avenue SE. #14 St. Petersburg, Florida 33701
Re: K190523
Trade/Device Name: OSSDSIGN Cranial PSI Accessories Regulation Number: 21 CFR 882.5330 Regulation Name: Preformed Nonalterable Cranioplasty Plate Regulatory Class: Class II Product Code: PJN Dated: September 9, 2019 Received: September 10, 2019
Dear David Weissburg:
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 probibitions 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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801); medical device reporting (reporting of medical device-related adverse events) (21 CFR 803) for 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 (QS) 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-devices/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 (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 Matthew Krueger Assistant Director DHT5A: Division of Neurosurgical. Neurointerventional and Neurodiagnostic Devices OHT5: Office of Neurological and Physical Medicine 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) K190523
Device Name OSSDSIGN Cranial PSI Accessories
#### Indications for Use (Describe)
Cranial PSI Accessories are indicated for use as accessories to the OSSDSIGN Cranial PSI for the reconstruction of cranial defects. They are indicated for non-load bearing applications for patients in whom cranial growth is complete and for use with an intact dura, with or without duraplasty.
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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### 510(k) SUMMARY
#### K190523
- 1. 510(k) Owner Name and Address: OSSDSIGN AB Virdings Alle 2, SE 754 50, Uppsala Sweden Telephone: +46 (0) 18-55 39 93 Email: ub@ossdsign.com Contact: Ulrik Birgersson
- 2. Contact Person: David Weissburg Weissburg Associates 300 2ND Avenue SE, Suite 14 St. Petersburg, FL 33701 USA
- 3. Date prepared: October 10, 2019
- 4. Trade Name: OSSDSIGN Cranial PSI Accessories
- Requlation Description: Preformed Non-alterable Cranioplasty Plate 5.
- 6. Classification Name: Plate, Preformed Non-alterable Cranioplasty Plate (21 CFR 882.5330, Product code: PJN)
- 7. Class: 2
- 8. Substantially equivalent to: OSSDSIGN Cranial PSI (Parent Device, K161090)
- 9. Device Description: OSSDSIGN Cranial PSI Accessories are optional devices that support physician use of the OSSDSIGN Cranial PSI (K161090) parent device. They are additively manufactured from PA2200 polyamide material. Each Cranial PSI Accessory is patient-specific and corresponds to a patient's unique anatomical requirements. Cranial PSI Accessories are intended to support implantation of the corresponding Cranial PSI parent device; both devices are designed from the same patient-specific computed tomography image data set.
- Anatomical Model Original supports OSSDSIGN Cranial PSI by facilitating visual and tactile orientation for the physician of the patient's anatomy. It is provided non-sterile, is not intended to be sterilized and is not to be brought into contact with Cranial PSI, Plastic Drawing Guide or the Cranial Implant Trial.
- Anatomical Model Modified supports OSSDSIGN Cranial PSI by facilitating visual ● and tactile orientation for the physician after removal of physician-specified regions. It is provided non-sterile, is not intended to be sterilized and is not to be brought into contact with Cranial PSI, Plastic Drawing Guide or the Cranial Implant Trial.
- Plastic Drawing Guide supports accurate placement and fitting of OSSDSIGN Cranial PSI by assisting physicians in marking of bone intended for removal. Provided sterile.
- Cranial Implant Trial supports placement and fitting of OSSDSIGN Cranial PSI by . assisting physicians in confirming OSSDSIGN Cranial PSI fit, fixation point positions and soft tissue coverage. Provided sterile.
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# 10. Indications for Use:
Cranial PSI Accessories are indicated for use as accessories to the OSSDSIGN Cranial PSI for the reconstruction of cranial defects. They are indicated for non-load bearing applications for patients in whom cranial growth is complete and for use with an intact dura, with or without duraplasty.
| | OSSDSIGN<br>Cranial PSI Accessories (subject device) | OSSDSIGN<br>Cranial PSI (K161090) without<br>Cranial PSI Accessories |
|------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Indications<br>For Use | Cranial PSI Accessories are<br>indicated for use as accessories to<br>the OSSDSIGN Cranial PSI for the<br>reconstruction of cranial defects.<br>They are indicated for non-load<br>bearing applications for patients in<br>whom cranial growth is complete<br>and for use with an intact dura,<br>with or without duraplasty. | OSSDSIGN Cranial PSI is<br>intended for the reconstruction of<br>cranial defects. It is indicated for<br>non-load bearing applications for<br>patients in whom cranial growth is<br>complete and for use with an intact<br>dura, with or without duraplasty. |
| Materials | PA2200 | Ti grade 23, proprietary calcium<br>phosphate ceramic |
| Max size | 200 cm² | 200 cm² |
| Provided form | Formed PA2200 | Titanium and Ceramic<br>Ceramic mixed and cured in<br>manufacturer's facility |
| Sterility | Anatomical Model Original:<br>provided non-sterile<br>Anatomical Model Modified:<br>provided non-sterile<br>Plastic Drawing Guide: provided<br>sterile<br>Cranial Implant Trial: provided<br>sterile | Cranial PSI: provided sterile |
# 11. Comparison of Technological Characteristics with the Predicate Device:
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| | | 12. Biocompatibility of Cranial PSI Accessories: |
|--|--|--------------------------------------------------|
|--|--|--------------------------------------------------|
| Test | Test Method Summary | Results |
|---------------------------------------------------|---------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------|
| Cytotoxicity | ISO 10993-5<br>Method:L-929 mouse fibroblast cells | Not cytotoxic.<br>The test article extract showed no<br>cytotoxic potential to L-929 mouse<br>fibroblast cells. |
| Systemic (acute)<br>toxicity | ISO 10993-11<br>Method: 20 mice observed at 4, 24,<br>48 and 72 hours | No systemic toxicity.<br>There was no mortality or evidence<br>of systemic toxicity from the<br>extracts injected into mice. |
| Sensitization<br>Study | ISO 10993-10<br>Method: Guinea Pig Maximization<br>scored at 24 and 48 hours | Not a sensitizer.<br>No evidence of delayed dermal<br>contact sensitization. |
| Irritation Study | ISO 10993-10<br>Method: Intracutaneous study in<br>rabbits scored at 24, 48 and 72<br>hours | Not an irritant.<br>No evidence of irritation. |
| Pyrogen Study | USP 40-NF 35<br>Method: IV injection in 3 rabbits | Non-pyrogenic.<br>No rabbit showed a temperature<br>rise >0.5°C. |
| Hemolysis Study | ISO 10993-4<br>Method: human blood | Non-hemolytic.<br>The mean hemolytic index for the<br>test article extract was of 0.1%. |
| Analytical<br>Extractable<br>Chemical<br>Analysis | ISO 10993-18<br>Method: extracts analyzed by FTIR,<br>GC-MS, UPLC-MS, ICP-MS and<br>GC-MS | Non-hazardous in all results.<br>No leachables were detected in<br>potentially toxic concentrations<br>from a worst-case device<br>configuration. |
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| Test Method and Relevance Summary | Results |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------|
| Deformation Test:<br>Resistance to deformation simulating a<br>clinician pressing hard with a surgical marker<br>against the Plastic Drawing Guide.<br>Requirement: <1mm deviation<br>Method: test article supporting 200g weight | <1mm deformation<br>in all cases |
| Simulated Clinical Use Study:<br>Plastic Drawing Guide (PDG) evaluated for worst<br>case friction and generation of particles.<br>Requirement: no visible particles generated during<br>the test or clinically acceptable particles.<br>Method: 10X 360° screw rotations and 2 cm drop<br>test, 10X magnification and visual inspection<br>Relevance: there is slight friction associated with<br>placement and removal of PDG into its<br>corresponding anatomical location. This study<br>simulates normal placement with a 5X worst-case<br>bias. | No visible particles<br>generated during the<br>test. |
| Dimensional Integrity Test:<br>Verification of dimensional integrity and fit.<br>Requirement: no dimensional changes to any<br>devices.<br>Method: qualitative evaluation of fit after transport.<br>Relevance: conforming manufacturing controls<br>and packaging and shipping system. | No dimensional<br>changes to any<br>devices. |
### 13. Performance Testing:
14. Conclusions: Nonclinical tests demonstrate that the Cranial PSI Accessories which are intended to be used with the Cranial PSI are substantially equivalent to the Cranial PSI.
- Cranial PSI Accessories demonstrate biocompatibility consistent with current ● consensus standards.
- Plastic Drawing Guide demonstrates resistance to deformation in excess of loading . applied in clinical use.
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.