Retrospective data from 151 patients was used to demonstrate the device's performance in intraluminal lesion crossing and subintimal re-entry procedures, supporting the safety and effectiveness of the modified device.
Technical success rate (intraluminal crossing and subintimal re-entry), Major Adverse Event (MAE) rate
Indications for Use
The Upstream GoBack Crossing Catheter is intended to be used in conjunction with steerable guidewires to access discrete regions of the peripheral vasculature. It may be used to facilitate placement and exchange of guidewires. The Upstream GoBack Crossing Catheter is not intended for use in the coronary, cerebral or carotid vasculature.
Device Story
The GoBack Crossing Catheter is a sterile, single-use, single-lumen catheter used by physicians to navigate peripheral vasculature. It accepts 0.014" guidewires. The device features a nitinol hypotube with a pre-shaped curved lancet tip and a proximal handle. The operator uses a sliding knob on the handle to displace the needle tip and a rotation knob to rotate the shaft and needle. The device facilitates intraluminal lesion crossing and subintimal re-entry. By providing a steerable, curved needle tip, the catheter assists in crossing difficult vascular lesions, potentially improving procedural success rates for peripheral interventions. It is used in clinical settings during endovascular procedures.
Clinical Evidence
Retrospective clinical study of 151 patients. Evaluated performance in intraluminal lesion crossing (n=62, 88.7% technical success) and subintimal re-entry (n=89, 88.8% technical success). Major adverse event (MAE) rate was 0%.
Technological Characteristics
Single-lumen catheter; reinforced polyimide shaft, stainless steel or Nylon 12 distal tip, nitinol hypotube, PTFE polymer sleeve. Dimensions: 2.9 Fr or 4.0 Fr; 80 cm or 120 cm lengths. Manual actuation via handle-mounted sliding and rotation knobs. Biocompatible materials per ISO 10993-1:2018. Sterilized device.
Indications for Use
Indicated for use with steerable guidewires to access discrete regions of the peripheral vasculature and facilitate guidewire placement/exchange. Contraindicated for use in coronary, cerebral, or carotid vasculature.
Regulatory Classification
Identification
A percutaneous catheter is a device that is introduced into a vein or artery through the skin using a dilator and a sheath (introducer) or guide wire.
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March 1, 2022
Image /page/0/Picture/1 description: The image shows the logo of the U.S. Food and Drug Administration (FDA). The logo consists of two parts: the Department of Health & Human Services logo on the left and the FDA logo on the right. The FDA logo is in blue and includes the letters "FDA" in a square and the words "U.S. FOOD & DRUG ADMINISTRATION".
Upstream Peripheral Technologies, Ltd % Janice Hogan Regulatory Counsel Hogan Lovells US LLP 1735 Market Street, 23rd Floor Philadelphia, Pennsylvania 19103
Re: K211802
Trade/Device Name: GoBack Crossing Catheter Regulation Number: 21 CFR 870.1250 Regulation Name: Percutaneous Catheter Regulatory Class: Class II Product Code: PDU Dated: January 27, 2022 Received: January 27, 2022
Dear Janice Hogan:
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 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
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requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Part 801); medical device 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 (OS) 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-device-safety/medical-device-reportingmdr-how-report-medical-device-problems.
For comprehensive regulatory information about mediation-emitting products, including information about labeling regulations, please see Device Advice (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 Lydia Glaw Assistant Director DHT2C: Division of Coronary and Peripheral Intervention Devices OHT2: Office of Cardiovascular 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) K211802
Device Name Upstream GoBack Crossing Catheter
#### Indications for Use (Describe)
The Upstream GoBack Crossing Catheter is intended to be used in conjunction with steerable guidewires to access discrete regions of the peripheral vasculature. It may be used to facilitate placement and exchange of guidewires. The Upstream GoBack Crossing Catheter is not intended for use in the coronary, cerebral or carotid vasculature.
| Type of Use (Select one or both, as applicable) |
|--------------------------------------------------------------------------------------------------------------------------------------------------------|
| <div style="display:flex; align-items:center;"> <div style="margin-right:5px;">☑</div> <span>Research Use (Part 21 CFR 361. Subpart D)</span> </div> |
| <div style="display:flex; align-items:center;"> <div style="margin-right:5px;">☐</div> <span>Over-The-Counter Use (21 CFR 361 Subpart C)</span> </div> |
> Prescription Use (Part 21 CFR 801 Subpart D)
__ Over-The-Counter Use (21 CFR 801 Subpart C)
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### 510(k) SUMMARY
# Upstream Peripheral Technologies Ltd's GoBack Crossing Catheter
### Applicant Information:
Upstream Peripheral Technologies Ltd. ARAN Building P.O. Box 3067 43 Haeshel Street Caesarea 38900 lsrael
| Phone: | (972) 4-6239014 |
|-----------------|-----------------|
| Facsimile: | (972) 4-6273260 |
| Contact Person: | Dan Rottenberg |
| Date Prepared: | March 1, 2022 |
Device Information:
| Trade Name: | Upstream GoBack Crossing Catheter |
|-----------------------|-----------------------------------------------|
| Common or Usual Name: | Percutaneous Catheter |
| Classification: | Class II per 21 CFR 870.1250 |
| Product Code: | PDU |
| Predicate Device: | Upstream GoBack Crossing Catheter (K182937 |
| Reference Device: | Cord is Outback Catheters (K001577 / K150836) |
| Reference Device: | ReFlow Wingman Crossing Catheter (K151880) |
### Intended Use / Indications for Use:
The Upstream GoBack Crossing Catheter is intended to be used in conjunction with steerable guidewires to access discrete regions of the peripheral vasculature. It may be used to facilitate placement and exchange of guidewires.
The Upstream GoBack Crossing Catheter is not intended for use in the coronary, cerebral or carotid vasculature.
### Device Description:
The Upstream GoBack Crossing Catheter is a sterile, single-use, single lumen crossing catheter.
The Upstream GoBack Crossing Catheter is intended for use with 0.014" coated or noncoated guidewires. The effective length of the GoBack Crossing Catheter is 80 cm or 120 cm with an outer diameter of either 0.96 mm (2.9 Fr) or 1.4 mm. (4.0 Fr). The table below shows the 4 models of the device.
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| GoBack Crossing Catheter Description | Model Number |
|-----------------------------------------|-----------------|
| 2.9 Fr, 80 cm GoBack Crossing Catheter | GB 603 014 80L |
| 2.9 Fr, 120 cm GoBack Crossing Catheter | GB 603 014 120L |
| 4 Fr, 80 cm GoBack Crossing Catheter | GB 600 018 80L |
| 4 Fr, 120 cm GoBack Crossing Catheter | GB 600 018 120L |
# GoBack Crossing Catheter: 4 Models
The GoBack Crossing Catheter is made from three lavers; a reinforced polyimide shaft with stainless steel distal tip (in the 2.9 Fr device) or stainless steel and Nylon 12 distal tip (in the 4.0 Fr device), nitinol hypotube, and PTFE polymer sleeve over the nitinol hypotube inside the shaft. The nitinol hypotube has a pre-shaped curved lancet tip at the distal end and a hub at the proximal end for guidewire access. The nitinol tube / needle can move at limited displacement inside the shaft by moving a sliding knob in the catheter handle. The nitinol tube (with the PTFE sleeve) and the polyimide shaft may rotate together using a rotation knob on the catheter handle.
# Comparison of Technological Characteristics:
The Upstream GoBack Crossing Catheter is identical to the predicate Upstream GoBack Crossing Catheter in its basic design, intended use, Indications for Use statement, mechanism of action, operating principle, and sterilization method. The principal changes to the subject device to the predicate are limited to: (i) the availability of the subject device in two diameters (0.96 mm (2.9 Fr) or 1.4 mm (4 Fr)) and two lengths (80 cm and 120 cm ); (ii) a PTFE sleeve with Pebax outer suface covering the distal tip inner metal surface; and (iii) non-coring treatment of the needle heel. Additionally, the 4 Fr model stainless steel distal tip is partially covered by Nylon 12 and the 2.9 Fr model has a proportionally smaller shaft, PTFE sleeve, distal tip, RO marker, spine height and needle protrusion (7 mm vs. 11 mm) than the 4 Fr subject device model and 4 Fr predicate device (which are identical across these characteristics) .
The predicate and all models of the Upstream GoBack Crossing Catheter are comprised of biocompatible materials and are single-lumen, single-use, devices that incorporate a distal curved lancet tip of a slid able nitinol tube, a SS304 metal tube section to hold the curved needle inside the catheter tip, and a proximal handle with female luer hub. The predicate and all models of the Upstream GoBack Crossing Catheter have a mechanism for device navigation and function through the peripheral vasculature. Warnings against use of polymer coated guidewires or use in re-entry applications were removed from the subject Upstream GoBack Crossing Catheter labeling. Removal of these warnings was validated in bench and clinical testing. Furthermore, design verification and validation testing conducted with the GoBack Crossing Catheter demonstrates that the device continues to meet all previous performance specifications and that minor differences in technological features do not impact the safety or effectiveness of the subject device.
# Performance Testing Summary:
The following performance data were provided in support of the substantial equivalence determination:
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# BIOCOMPATIBILITY TESTING
Biocompatibility testing was performed on subject devices containing Nylon 12 and Pebax in compliance with U.S. Food and Drug Administration Good Laboratory Practice (GLP) regulations set forth in 21 CFR Part 58 and per ISO 10993-1:2018, Biological evaluation of medical devices – Part 1: Evaluation and testing within a risk management process, as well as applicable FDA biocompatibility guidance including:
- Cytotoxicity
- Sensitization
- Irritation/intracutaneous reactivity ●
- Systemic toxicity (acute)
- . Hemocompatibility (hemolysis, complement activation and thromboresistance)
- LAL and Material Mediated pyrogenicity
# DEVICE DIMENSIONAL AND FUNCTIONAL TESTING
Performed on sterile 2.9 Fr and 4 Fr models:
- . Particulates testing
- Torque testing (torque at break and transfer torque forces) .
- Force at break testing
- Delivery testing
- . Radio-opacity testing
- Surface testing
- . Needle tip protrusion testing
- . Catheter dimensions testing
Performed on a sterile 2.9 Fr model:
- Air leakage testing ●
- . Liquid leakage testing
- . Force at break testing
- Radio-opaque
- . RO marker movement
- Bend to kink testing
- . Needle penetration testing
- . Transfer torsional forces
# OTHER PERFORMANCE TESTING
- Testing was performed in which polymer coated guidewires from different manufacturers ● were passed through the GoBack Crossing Catheter models to demonstrate that no coating abrasion or peeling occurs with the non-coring needle tip
- A 2 year shelf life was established for the subject device .
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# CLINICAL TESTING
Retrospective data from 151 patients demonstrated that the GoBack Crossing Catheter performed equivalently to the predicate in subintimal re-entry procedures. The clinical study demonstrates that the modified GoBack Catheter can be used for both intraluminal lesion crossing and for subintimal reentry. The GoBack Catheter device was used for intraluminal crossing in 62 subjects with a technical success rate of 88.7%, and for subintimal re-entry crossing in 89 subjects with a similar technical success rate of 88.8%. Across all procedures the major adverse event (MAE) rate was 0%.
### Conclusions:
The Upstream GoBack Crossing Catheter and the predicate device have the same intended use and indications, and very similar technological characteristics and principles of operation. The minor labeling updates and technological differences between the Upstream GoBack Crossing Catheter and its predicate do not raise different types of safety or effectiveness questions. Performance testing demonstrates that the Upstream GoBack Crossing Catheter performs as intended and meets all design specifications with respect to its mechanical and handling characteristics, and that its materials are biocompatible. Additional performance and clinical testing demonstrates that the Upstream GoBack Crossing Catheter has a safety and effectiveness profile that is substantially equivalent to the predicate. Thus, the modified Upstream GoBack Crossing Catheter is substantially equivalent to the predicate GoBack Crossing Catheter.
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.