The Guglielmi Detachable Coil (GDC) is intended for embolizing certain intracranial aneurysms that - because of their morphology, their location, or the patient's general medical condition - are considered by the treating neurosurgical team to be: a)very high risk for management by traditional operative techniques, or, b) inoperable, and for embolizing other vascular malformations such as arteriovenous malformations and arteriovenous fistulae of the neurovasculature. The GDC is also intended for arterial and venous embolizations in the peripheral vasculature.
Device Story
System consists of platinum occlusion coil attached to delivery wire, power supply, connecting cables, and patient return electrode. Used for embolization of intracranial aneurysms and vascular malformations. Operated by neurosurgical team in clinical setting. Coil placed in target anatomy; detachment initiated via electrolytic dissolution of delivery wire connection using battery-operated power supply. Power supply provides current control, voltage/time displays, and detachment detection via audible beeps. Stretch-resistant version incorporates polymer filament to improve structural integrity. Device enables minimally invasive treatment for high-risk or inoperable aneurysms, reducing need for traditional open surgery.
Clinical Evidence
Bench testing only. No clinical data presented. Verification testing included friction, tensile strength of main coil weld, detachment time, particulate analysis during detachment, heating effects of electrolysis and MRI, tip ball strength, and main coil stretch testing. All tests met acceptance criteria established for the predicate device.
Technological Characteristics
Platinum occlusion coil with polymer stretch-resistant filament. Delivery wire: stainless steel core with Teflon jacket. Power supply: battery-operated (two 9-volt), provides controlled DC current for electrolytic detachment. Dimensions: coil primary wind 0.0095"-0.015"; secondary coil 2-30 mm. Connectivity: wired connection between power supply, cables, and delivery wire. Sterilization: not specified.
Indications for Use
Indicated for patients with intracranial aneurysms deemed high-risk or inoperable by neurosurgical teams, and for patients with vascular malformations (arteriovenous malformations/fistulae) of the neurovasculature. Also indicated for arterial and venous embolizations in the peripheral vasculature.
Regulatory Classification
Identification
A neurovascular embolization device is an intravascular implant intended to permanently occlude blood flow to cerebral aneurysms and cerebral ateriovenous malformations. This does not include cyanoacrylates and other embolic agents, which act by polymerization or precipitation. Embolization devices used in other vascular applications are also not included in this classification, see § 870.3300.
Special Controls
*Classification.* Class II (special controls.) The special control for this device is the FDA guidance document entitled “Class II Special Controls Guidance Document: Vascular and Neurovascular Embolization Devices.” For availability of this guidance document, see § 882.1(e).
Shelf Life, Various Class II and Class III Devices (K971395)
Submission Summary (Full Text)
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### Section 2 - 510 (k) Summary of Safety and Effectiveness and Class III Certification and Summary
### a. Summary Of Safety And Effectiveness
Contact Person
Roxane Baxter Regulatory Affairs Manager Boston Scientific / Target 47900 Bayside Parkway Fremont, CA. 94538
Trade Name
Guglielmi Detachable Coil (GDC), Class III
Common Name
Occlusion Coil
Classification Name
Artificial Embolization Device (21 CFR Section 882.5950)
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#### Predicate Devices
| Number | Description | Predicate for | Clearance<br>Date |
|-------------------------------------------------------|-----------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------|
| K962503<br>(Boston Scientific /<br>Target) | Guglielmi Detachable Coil | GDC-10 and GDC-10<br>(2D) Stretch Resistant<br>Guglielmi<br>Detachable Coils<br>and<br>GDC-18 and GDC-18<br>(2D) Stretch Resistant<br>Guglielmi<br>Detachable Coils | 20 Sept. 1996 |
| K930738 (Deknatel,<br>Division of<br>Howmedica, Inc.) | Implantable Surgical<br>Sutures | Suture material | 26 July 1994 |
| K971395<br>(Boston Scientific /<br>Target) | Shelf Life, Various Class II<br>and Class III Devices for | For shelf-life<br>validation method<br>and subsequent<br>placement of shelf-<br>life information on<br>device label | 14 July 1997 |
#### Intended Use
The Guglielmi Detachable Coil (GDC) is intended for embolizing certain intracranial aneurysms that - because of their morphology, their location, or the patient's general medical condition - are considered by the treating neurosurgical team to be:
a)very high risk for management by traditional operative techniques, or,
b) inoperable,
and for embolizing other vascular malformations such as arteriovenous malformations and arteriovenous fistulae of the neurovasculature.
The GDC is also intended for arterial and venous embolizations in the peripheral vasculature.
The indications for use for Stretch Resistant GDC are identical to those for the predicate GDC device cleared under K962503.
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#### Device Description
The GDC system consists of:
- · GDC power supply
- · GDC occlusion coil attached to a delivery wire
- · set of GDC connecting cables
- patient return electrode
- · two 9-volt batteries
each of which is sold separately.
The occlusion coil is detached by electrolytically dissolving a small portion of the delivery wire upon desired placement of the coil in the anatomy.
GDC occlusion coils are manufactured from platinum wire which is first wound into a primary coil and then formed into a secondary helical shape.
Coils are attached to a delivery wire, which consists of a ground stainlesssteel core wire with a stainless-steel coil welded at the distal end and a Teflon® outer jacket. The delivery wire is the same as that employed for the predicate GDC cleared under K962503.
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The GDC Power Supply is a self-contained, battery-operated unit designed to initiate and control detachment of a GDC coil. It has an on/off button, connections for the GDC cables, and the following controls and displays:
- · Current setting switch and display Allows for selection of the different current settings. The selected current (mA) is briefly displayed after which the unit displays the current flowing through the system.
- · Voltage diplay and indicator Displays the DC output voltage.
- · Time display Displays the elapsed time that the current has been flowing through the GDC system.
- Check indicator Flashes on and off at the beginning of a detachment procedure if there is a poor connection to the patient.
- · Detach indicator Flashes on and off when the power supply has detected detachment. Detachment is accompanied by five beeps.
- · Battery indicator Illuminates when the voltage of the internal 9-volt batteries falls below specification.
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# Technological Characteristics Comparison
## Coil Dimensional Attributes
| | GDC<br>(Predicate device cleared<br>under K962503) | Stretch Resistant GDC |
|------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------|
| Coil Primary Wind OD | 0.010" - 0.015" | 0.0095", 0.010", 0.0135" or<br>0.015" |
| Secondary Coil OD | GDC-10: 2 mm - 30 mm | GDC-10: 2 mm - 30 mm |
| | GDC-18: 2 mm - 30 mm | GDC-18: 2 mm - 30 mm |
| Coil Wire OD | Range: 0.001" - 0.005"<br><br>Current wire sizes used in the<br>production of GDC devices<br>are:<br>GDC-10: 0.00175", 0.002"<br><br>GDC-18: 0.00225", 0.003",<br>0.004" | GDC-10: 0.0175", 0.002"<br><br>GDC-18: 0.00225", 0.003" |
| Delivery Wire Length | 50 - 200 cm | 175 cm |
| Delivery Wire<br>Proximal OD | GDC-10: 0.010"<br><br>GDC-18: 0.010" | GDC-10: 0.010"<br><br>GDC-18: 0.010" |
| | Delivery Wire<br>Distal OD | GDC-10: 0.0028"<br><br>GDC-18: 0.0028" |
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.
# Technological Characteristics Comparison (cont.)
## Materials
| | Stretch Resistant GDC |
|--------------------------------------------------|--------------------------|
| Main Coil | Same as predicate device |
| Stretch Resistant<br>Filament | Polymer |
| Delivery Wire: | |
| Core wire<br>w/coating | Same as predicate device |
| Proximal Coil | Same as predicate device |
| Proximal Marker<br>Coil | Same as predicate device |
| Sheath, Delivery<br>Wire (heat shrink<br>tubing) | Same as predicate device |
| Proximal Tubing | Same as predicate device |
| Bushing | Same as predicate device |
| Hypotube | N/A |
| Anchor Coil | Platinum |
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# Technological Characteristics Comparison (cont.)
# Power Supply
| | GDC Power Supply,<br>Stretch Resistant GDC |
|--------------------------|--------------------------------------------|
| Power | Same as for predicate device. |
| Batteries | Same as for predicate device. |
| Expected Battery<br>Life | Same as for predicate device. |
| Red Cable | Same as for predicate device. |
| Black Cable | Same as for predicate device. |
| Current Settings | Same as for predicate device. |
| Current | Same as for predicate device. |
| Voltage | Same as for predicate device. |
| Operating Temp. | Same as for predicate device. |
| Storage Temp. | Same as for predicate device. |
| Relative Humidity | Same as for predicate device. |
| Unit Size | Same as for predicate device. |
| Unit Weight | Same as for predicate device. |
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### Verification Test Summary Table: Comparison of Stretch Resistant GDC Devices to the Predicate Device
| Test or Point of Comparison | Stretch Resistant GDC |
|-------------------------------------------------|-------------------------------------------------------------------------------------------------|
| Friction | Meets acceptance criteria established for<br>predicate device. |
| Tensile Strength, Main Coil Weld | Meets acceptance criteria established for<br>predicate device. |
| Detachment Time | Meets acceptance criteria established for<br>predicate device. |
| Detachment in Saline w/ particulate<br>analysis | No change was made which would result<br>in the generation of particulate during<br>detachment. |
| Heating Effect of Electrolysis | No change made which would influence<br>or increase heating effect. |
| Heating Effect of MRI | No change made which would increase<br>heating effect of MRI. |
| Tip Ball Strength | Meets acceptance criteria established for<br>strength of tip ball. |
| Main Coil Stretch Test | Meets acceptance criteria for the<br>modified device. |
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Image /page/8/Picture/1 description: The image shows the seal of the Department of Health & Human Services - USA. The seal is circular and contains the text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA" around the perimeter. Inside the circle is a symbol consisting of three stylized human figures connected by flowing lines, representing health and human services.
Public Health Service
JAN 2 1 2000
Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850
Ms. Roxane K. Baxter, RAC Manager, Regulatory Affairs Boston Scientific/Target 47900 Bayside Parkway Freemont, California 94538
Re: K993415
> Trade Name: GDC-10 Stretch Resistant Guglielmi Detachable Coil GDC-10 (2D) Stretch Resistant Guglielmi Detachable Coil GDC-18 Stretch Resistant Guglielmi Detachable Coil GDC-18 (2D) Stretch Resistant Geglielmi Detachable Coil Regulatory Class: III Product Code: HCG and KRD Dated: September 29, 1999 Received: October 1, 1999
Dear Ms. Baxter:
We have reviewed your Section 510(k) notification of intent to market the device referenced above and we have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to 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). 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.
If your device is classified (see above) into either class II (Special Controls) or class III (Premarket Approval), it may be subject to such additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 895. A substantially equivalent determination assumes compliance with the current Good Manufacturing Practice requirement, as set forth in the Quality System Regulation (QS) for Medical Devices: General regulation (21 CFR Part 820) and that, through periodic (QS) inspections, the Food and Drug Administration (FDA) will verify such assumptions. Failure to comply with the GMP regulation may result in regulatory action. In addition, FDA may publish further announcements concerning your device in the Federal Register. Please note: this response to your premarket notification submission does not affect any obligation you might have under sections 531 through 542 of the Act for devices under the Electronic Product Radiation Control provisions, or other Federal laws or regulations.
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Page 2 - Ms. Roxane K. Baxter, RAC
This letter will allow you to begin marketing your device as described in your 510(k) premarket notification. The FDA finding of substantial equivalence of your device to a legally marketed predicate device results in a classification for your device and thus, permits your device to proceed to the market.
If you desire specific advice for your device on our labeling regulation (21 CFR Part 801 and additionally 809.10 for in vitro diagnostic devices), please contact the Office of Compliance at (301) 594-4595. Additionally, for questions on the promotion and advertising of your device, please contact the Office of Compliance at (301) 594-4639. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR 807.97). Other general information on your responsibilities under the Act may be obtained from the Division of Small Manufacturers Assistance at its toll-free number (800) 638-2041 or (301) 443-6597 or at its internet address "http://www.fda.gov/cdrh/dsmamain.html".
Sincerely yours,
James E. Dillard III
James E. Dillard III Acting Director Division of General and Restorative Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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### INDICATIONS FOR USE STATEMENT
510(k) Number: __
Device Name: GDC-10 Stretch Resistant Guglielmi Detachable Coil GDC-10 (2D) Stretch Resistant Guglielmi Detachable Coil and GDC-18 Stretch Resistant Guglielmi Detachable Coil GDC-18 (2D) Stretch Resistant Guglielmi Detachable Coil
#### Indications for Use:
・
The Guglielmi Detachable Coil (GDC) is intended for embolizing certain intracranial aneurysms that - because of their morphology, their location, or the patient's general medical condition - are considered by the treating neurosurgical team to be:
a) very high risk for management by traditional operative techniques, or,
b) inoperable,
and for embolizing other vascular malformations such as arteriovenous malformations and arteriovenous fistulae of the neurovasculature.
The GDC is also intended for arterial and yenous embolizations in the peripheral vasculature.
(Division Sign-Off)
Division of General Restorative Devices K993415
510(k) Number.
(PLEASE DO NOT WRITE BELOW THIS LINE - CONTINUE ON ANOTHER PAGE IF NEEDED)
Concurrence of CDRH, Office of Device Evaluation (ODE)
| Prescription Use | X |
|----------------------|---|
| (Per 21 CFR 801.109) | |
510(k) Notification, Boston Scientific/Target, GDC-10 and GDC-18 Stretch Resistant GDC CONFIDENTIAL Section 3, Page 2 September 1999
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.