SIREGRAGH T.O.P. 33 AND SIREGRAPH T.O.P. 40 UNIVERSAL FLUOROSCOPIC X-RAY SYSTEMS
K970734 · Siemens Medical Solutions USA, Inc. · OWB · Apr 21, 1997 · Radiology
Device Facts
Record ID
K970734
Device Name
SIREGRAGH T.O.P. 33 AND SIREGRAPH T.O.P. 40 UNIVERSAL FLUOROSCOPIC X-RAY SYSTEMS
Applicant
Siemens Medical Solutions USA, Inc.
Product Code
OWB · Radiology
Decision Date
Apr 21, 1997
Decision
SESE
Submission Type
Traditional
Regulation
21 CFR 892.1650
Device Class
Class 2
Attributes
Pediatric
Indications for Use
The Siregraph T.O.P. 33 and T.O.P. 40 Universal Fluoroscopic X-ray Systems are devices intended to visualize anatomical structures by converting a pattern of X-ray into a visible image through electronic amplification. Both systems have medical applications ranging from gastrointestinal examinations to cranial, skeletal, thoracic and lung exposures as well as examination of the urogenital tract, lymphography, endoscopy, myelography, venography, pediatrics, arthrography, interventional radiology, digital angiography, and digital subtraction angiography (DSA).
Device Story
Universal fluoroscopic X-ray system with overtable tube assembly; available as T.O.P. 33 (undertable spot film) or T.O.P. 40 (Digital Fluoro Radiography with undertable Image Intensifier). System converts X-ray patterns into visible images via electronic amplification. Operated by clinicians via table-side controls or remote console. Components include patient support table, X-ray generator, tube, image intensifier, TV system, digital imaging system, and monitors. Used in clinical settings for diagnostic and interventional procedures. Updated XCS communication network facilitates component interaction. Output displayed on monitors for real-time visualization and clinical decision-making during procedures.
Clinical Evidence
No clinical data provided; bench testing only.
Technological Characteristics
Universal fluoroscopic X-ray system; overtable X-ray tube; undertable spot film (T.O.P. 33) or Image Intensifier (T.O.P. 40). Includes X-ray generator, TV system, digital imaging system, and monitors. Features XCS communication network for component connectivity. Ergonomic design. Class II device.
Indications for Use
Indicated for visualization of anatomical structures in patients of all ages, including pediatric, requiring gastrointestinal, cranial, skeletal, thoracic, lung, urogenital, lymphographic, endoscopic, myelographic, venographic, arthrographic, interventional, or angiographic (including DSA) examinations.
Regulatory Classification
Identification
An image-intensified fluoroscopic x-ray system is a device intended to visualize anatomical structures by converting a pattern of x-radiation into a visible image through electronic amplification. This generic type of device may include signal analysis and display equipment, patient and equipment supports, component parts, and accessories.
Special Controls
*Classification.* Class II (special controls). An anthrogram tray or radiology dental tray intended for use with an image-intensified fluoroscopic x-ray system only is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 892.9. In addition, when intended as an accessory to the device described in paragraph (a) of this section, the fluoroscopic compression device is exempt from the premarket notification procedures in subpart E of part 807 of this chapter subject to the limitations in § 892.9.
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APR 21 1997
K970734
# SIEMENS
## Attachment 12
### 510(k) Summary
**Siregraph T.O.P. 33 and Siregraph T.O.P. 40**
Submitted by:
Siemens Medical Systems, Inc.
186 Wood Avenue South
Iselin, NJ 08830
February 27, 1997
This 510(k) summary of safety and effectiveness information is being submitted in accordance with the requirements of SMDA 1990 and 21 CFR §807.92.
1. Contact Person:
Ms. Jing Zhang
Phone: (908)321-4927 Fax: (908)321-4841
2. Device Name and Classification:
Trade Name: Siregraph T.O.P. 33 and Siregraph T.O.P. 40 Universal Fluoroscopic X-ray Systems
Classification Name: Image Intensified Fluoroscopic X-ray System
Classification Panel: Radiology
CFR Section: 21 CFR §892.1650
Device Class: Class II
Device Code: 90JAA ↑ OWB
3. Intended Use:
The Siregraph T.O.P. 33 and T.O.P. 40 Universal Fluoroscopic X-ray Systems are devices intended to visualize anatomical structures by converting a pattern of X-ray into a visible image through electronic amplification. Both systems have medical applications ranging from gastrointestinal examinations to cranial, skeletal, thoracic and lung exposures as well as examination of the urogenital tract, lymphography, endoscopy, myelography, venography, pediatrics, arthrography, interventional radiology, digital angiography, and digital subtraction angiography (DSA).
4. Substantial Equivalence:
The Siregraph T.O.P. 33 and 40 are substantially equivalent to the following devices in commercial distribution:
Simplified 510(k) for Siregraph T.O.P. 33 & 40 Siemens Medical Systems, Inc. Pg. 57 of 58
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# SIEMENS
- Siregraph D3 and D340, K860913
Siemens Medical Systems, Inc.
- Siregraph CF, K960266
Siemens Medical Systems, Inc.
## 5. Device Description:
Siregraph T.O.P. is a universal fluoroscopic X-ray diagnostic system with an overtable X-ray tube assembly. Two versions are available: Siregraph T.O.P. 33 for use with an undertable spot film device, and Siregraph T.O.P. 40 for use in Digital Fluoro Radiography (DFR) with an undertable Image Intensifier (I.I.). Both systems are operated either via table side control or the remote control console.
## 6. Summary of Technological Characteristics of the Device Compared to the Predicate Devices:
Siregraph T.O.P. has the same technological characteristics as the predicate Siregraph D3/D340. Both systems are remote fluoroscopic X-ray diagnostic systems with an overtable X-ray tube assembly. Like Siregraph D3 and D340, Siregraph T.O.P. consists of the basic system (patient support table), and standard system components: X-ray generator, X-ray tube, Image Intensifier, TV system, digital imaging system, monitors, optional Bucky wall stand and optional ceiling-mounted support for second X-ray tube. The differences between Siregraph D3/D340 and Siregraph T.O.P. are:
- The Siregraph T.O.P. basic system is redesigned for better ergonomics.
- The communication network among system components (e.g., generator, tube, etc.) has been updated. The XCS communication system is employed.
- Siregraph T.O.P. are configured with the latest commercially available system components.

Simplified 510(k) for Siregraph T.O.P. 33 & 40 Siemens Medical Systems, Inc. Pg. 58 of 58
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HUMAN SERVICES, INC.
DEPARTMENT OF HEALTH & HUMAN SERVICES
Public Health Service
Food and Drug Administration
10903 New Hampshire Avenue
Silver Spring, MD 20993
Ms. Kathleen Rutherford
Manager, Regulatory Submissions
Siemens Medical Systems, Inc.
186 Wood Avenue South
ISELIN NJ 08830
FEB 19 2013
Re: K970734
Trade/Device Name: Siregraph T.O.P. 33 and Siregraph T.O.P 40
Universal Fluoroscopic X-ray System
Regulation Number: 21 CFR 892.1650
Regulation Name: Image-intensified fluoroscopic x-ray system
Regulatory Class: II
Product Code: OWB and JAA
Dated: February 27, 1997
Received: February 28, 1997
Dear Ms. Rutherford:
This letter corrects our substantially equivalent letter of April 21, 1997.
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.
If your device is classified (see above) into class II (Special Controls), it may be subject to such additional controls. Existing major regulations affecting your device can be found in Title 21, Code of Federal Regulations (CFR), Parts 800 to 895. 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 Parts 801 and 809); medical device reporting (reporting of
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Page 2
medical device-related adverse events) (21 CFR 803); and good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820). This letter will allow you to begin marketing your device as described in your Section 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 Parts 801 and 809), please contact the Office of *In Vitro Diagnostic Device Evaluation and Safety* at (301) 796-5450. 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 Small Manufacturers, International and Consumer Assistance at its toll-free number (800) 638-2041 or (301) 796-7100 or at its Internet address http://www.fda.gov/cdrh/industry/support/index.html.
Sincerely Yours,

Janine M. Morris
Acting Director
Division of Radiological Devices
Office of In Vitro Diagnostic Device
Evaluation and Safety
Center for Devices and Radiological Health
Enclosure
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Attachment 1
Indications for Use
510(k) Number (if known): K970734
Device Name: Siregraph T.O.P. 33 and Siregraph T.O.P. 40
Indications for Use:
The Siregraph T.O.P. 33 and Siregraph T.O.P. 40 Universal Fluoroscopic X-ray Systems are devices intended to visualize anatomical structures by converting a pattern of X-ray into a visible image through electronic amplification. Both systems have medical applications ranging from gastrointestinal examinations to cranial, skeletal, thoracic and lung exposures as well as examination of the urogenital tract, lymphography, endoscopy, myelography, venography, pediatrics, arthrography, interventional radiology, digital angiography, and digital subtraction angiography (DSA).
Concurrence of the CDRH, Office of Device Evaluation (ODE)
David C. Segman
(Division Sign-Off)
Division of Reproductive, Abdominal, ENT, and Radiological Devices
510(k) Number K970734
Prescription Use ☑ OR Over-The-Counter Use ☐
(per 21 CFR 801.109)
Simplified 510(k) for Siregraph T.O.P. 33 & 40 Siemens Medical Systems, Inc.
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.