TopFine® LDS (Low Dead Space) Syringe (2 models (TS-LDS2334, TS-LDS2534))
K231856 · Medexel Co.,Ltd · QNQ · Mar 15, 2024 · General Hospital
Device Facts
Record ID
K231856
Device Name
TopFine® LDS (Low Dead Space) Syringe (2 models (TS-LDS2334, TS-LDS2534))
Applicant
Medexel Co.,Ltd
Product Code
QNQ · General Hospital
Decision Date
Mar 15, 2024
Decision
SESE
Submission Type
Traditional
Regulation
21 CFR 880.5860
Device Class
Class 2
Attributes
Therapeutic
Indications for Use
TopFine® LDS (Low Dead Space) Syringe is intended for use to inject fluid into or withdraw fluids from the parts of body below the surface of the skin.
Device Story
TopFine® LDS Syringe is a single-use, manually operated piston syringe with a permanently attached hypodermic needle. It consists of a calibrated hollow barrel, plunger, and needle. The device is used by clinicians to inject or withdraw fluids from the body. The low dead space design (≤ 0.03 ml) minimizes fluid retention. The device is supplied sterile via Ethylene Oxide gas. It is intended for use in clinical settings where subcutaneous or intramuscular fluid delivery or aspiration is required.
Clinical Evidence
No clinical data. Substantial equivalence supported by bench testing, including biocompatibility (ISO 10993-1), physical performance (ISO 7864, ISO 7886-1, ISO 9626), sterility, and packaging integrity (ASTM D4169, ASTM F88, ASTM F1929, ASTM F1980).
Technological Characteristics
Materials: SUS 304 needle, Polypropylene barrel/plunger/cap, Polyisoprene gasket. Manual operation. Low dead space (≤ 0.03 ml). Sterilization: Ethylene Oxide (SAL 10^-6). Standards: ISO 7864:2016, ISO 7886-1:2017, ISO 9626:2016, ISO 10993-1, USP <788>, USP <161>, USP <85>, ASTM D4169-22, ASTM F88/F88-15, ASTM F1929-15, ASTM F1980-21.
Indications for Use
Indicated for injection of fluids into or withdrawal of fluids from body parts below the skin surface. For prescription use.
Regulatory Classification
Identification
A piston syringe is a device intended for medical purposes that consists of a calibrated hollow barrel and a movable plunger. At one end of the barrel there is a male connector (nozzle) for fitting the female connector (hub) of a hypodermic single lumen needle. The device is used to inject fluids into, or withdraw fluids from, the body.
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March 15, 2024
MedExel Co., Ltd. % Peter Chung, President PlusGlobal 300 Atwood Street Pittsburgh, Pennsylvania 15213
Re: K231856
Trade/Device Name: TopFine® LDS (Low Dead Space) Syringe (2 models (TS-LDS2334, TS-LDS2534)) Regulation Number: 21 CFR 880.5860 Regulation Name: Piston Syringe Regulatory Class: Class II Product Code: QNQ Dated: February 14, 2024 Received: February 14, 2024
Dear Peter Chung:
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 (the 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 available 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.
Additional information about changes that may require a new premarket notification are provided in the FDA guidance documents entitled "Deciding When to Submit a 510(k) for a Change to an Existing Device" (https://www.fda.gov/media/99812/download) and "Deciding When to Submit a 510(k) for a Software Change to an Existing Device" (https://www.fda.gov/media/99785/download).
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2
Your device is also subject to, among other requirements, the Quality System (QS) regulation (21 CFR Part 820), which includes, but is not limited to, 21 CFR 820.30, Design controls; 21 CFR 820.90, Nonconforming product; and 21 CFR 820.100, Corrective and preventive action. Please note that regardless of whether a change requires premarket review, the QS regulation requires device manufacturers to review and approve changes to device design and production (21 CFR 820.70) and 21 CFR 820.70) and document changes and approvals in the device master record (21 CFR 820.181).
Please be advised that FDA's issuance of a substantial equivalence determination does not mean that FDA has made a determination that your device complies with other requirements of the Act or any Federal statutes and regulations administered by other Federal agencies. You must comply with all the Act's requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Part 801); medical device reporting of medical device-related adverse events) (21 CFR Part 803) for devices or postmarketing safety reporting (21 CFR Part 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 Part 4, Subpart A) for combination products; and, if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR Parts 1000-1050.
Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR 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, Shruti N. Mistry -S
Shruti Mistry Assistant Director, Injection Team Division of Drug Delivery and General Hospital Devices, and Human Factors Office of Gastrorenal, ObGyn, General Hospital, and Urology Devices Office of Product Evaluation and Quality
Center for Devices and Radiological Health
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# Indications for Use
510(k) Number (if known) K231856
Device Name
TopFine® LDS (Low Dead Space) Syringe (2 models (TS-LDS2334, TS-LDS2534))
Indications for Use (Describe)
TopFine® LDS (Low Dead Space) Syringe is intended for use to inject fluid into or withdraw fluids from the parts of body below the surface of the skin.
X Prescription Use (Part 21 CFR 801 Subpart D)
| Over-The-Counter Use (21 CFR 801 Subpart C)
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# K231856- 510(K) Summary
| I. Submitter |
|----------------------------------------------------------------------------------------------------------------------------------|
| 510(k) Submitter: MedExel Co., Ltd.<br>252, Geumgwangosan-ro, Geumgwang-myeon<br>Anseong Korea, South<br>Phone: +82-10-9992-9912 |
| Primary Contact: Peter Chung<br>US Agent<br>contact@plusglobal.net |
| Secondary Contact: Juntaek Seo<br>RA manager<br>jtseo@medexel.co.kr |
| Date prepared: 15 March, 2024 |
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#### II. Device Name
| Device Trade Name | TopFine® LDS (Low Dead Space)<br>Syringe<br>(2 models (TS-LDS2334, TS-LDS2534)) |
|---------------------|---------------------------------------------------------------------------------|
| Common Name | Piston syringe |
| Classification Name | Low Dead Space Piston Syringe |
| Regulation Number | 21 CFR 880.5860 |
| Product Code | QNQ |
- III. Legally Marketed Predicate Device
| Predicate # | K213010 |
|----------------------|----------------------------------------|
| Predicate Trade Name | FEELject LDV (Low dead volume) syringe |
#### Device Description IV.
The TopFine® LDS (Low Dead Space) Syringe is a device intended for medical purposes that consists of a calibrated hollow barrel and a movable plunger. At one end of the barrel there is a hypodermic single lumen needle which is a permanently attached. The device is used to inject fluids into, or withdraw fluids from, the body. It is made of plastic and silicone materials that allows for smooth plunger movement, and is manually operated. This is a single-use device. This product is packed by sterile paper and sterilized by Ethylene Oxide gas.
The proposed device has 2 models depending on the diameter of the needle.
| No. | Model name | Diameter of needle | Length of needle |
|-----|------------|------------------------|--------------------------|
| 1 | TS-LDS2334 | 23G (0.600 ~ 0.673 mm) | 26.5 mm (+1.5 / -2.5 mm) |
| 2 | TS-LDS2534 | 25G (0.500~ 0.530 mm) | 26.5 mm (+1.5 / -2.5 mm) |
The difference between the above 2 models is only the needle diameter.
#### V. Indications for Use
TopFine® LDS (Low Dead Space) Syringe is intended for use to inject fluid into or withdraw fluids from the parts of body below the surface of the skin.
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| Item | Proposed Device | Predicate Device | Remark | |
|-----------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------|-------------------------|
| 510(k) No. | K231856 | K213010 | - | |
| Regulation No. | 21 CFR 880.5860 | 21 CFR 880.5860 | Same | |
| Product Code | QNQ | QNQ, FMI | Same | |
| Indications for Use | TopFine® LDS (Low Dead Space) Syringe is intended for use to inject fluid into or withdraw fluids from the parts of body below the surface of the skin. | FEELject LDV (Low dead volume) Syringe is intended for use to inject fluid into or withdraw fluids from the parts of body below the surface of the skin. | Same | |
| Type of use | Prescription Use | Prescription Use | Same | |
| Mechanism of action | The plunger of syringe can be pulled and pushed along inside the barrel, allowing the syringe to take in and expel the fluids through the connector to the patient. | The plunger of syringe can be pulled and pushed along inside the barrel, allowing the syringe to take in and expel the fluids through the connector to the patient. | Same | |
| Number of uses | Single Use Only | Single Use Only | Same | |
| Configuration and materials | Needle<br>- Needle: SUS 304<br>- Cap: Polypropylene<br>- Barrel: Polypropylene<br>- Plunger: Polypropylene<br>- Gasket: Polyisoprene | Needle<br>- Needle: SUS 304<br>- Cap: Polypropylene<br>- Barrel: Polypropylene<br>- Plunger: Polypropylene<br>- Gasket: Polyisoprene | Same | |
| | Needle Gauge | 23G, 25G | 23G, 25G | Same |
| | Needle dimension – OD | 23G: 0.600 ~ 0.673 mm<br>25G: 0.500 ~ 0.530 mm | 23G: 0.600 ~ 0.673 mm<br>25G: 0.500 ~ 0.530 mm | Same |
| | Needle dimension – needle length | 26.5 mm<br>(+1.5 / -2.5 mm) | 25.0 mm<br>25.4 mm<br>38.1 mm | Different<br>See note 1 |
| | Syringe nozzle type | Permanently attached | Permanently attached | Same |
| | Syringe capacity | 1 ml | 1 ml | Same |
| Dead space | Low dead volume ≤ 0.03 ml | Low dead volume ≤ 0.03 ml | Same | |
| Biocompatibility | According to ISO 10993-1 | According to ISO 10993-1 | Same | |
| Performance Needle | ISO 7864:2016 Sterile hypodermic needles for single use – Requirements and test methods | ISO 7864:2016 Sterile hypodermic needles for single use – Requirements and test methods | Same | |
| | | ISO 9626:2016 Stainless<br>steel needle tubing for the<br>manufacture of medical<br>devices - Requirements<br>and test methods | ISO 9626:2016 Stainless<br>steel needle tubing for the<br>manufacture of medical<br>devices – Requirements<br>and test methods | |
| | Syringe | ISO 7886-1:2017 Sterile<br>hypodermic syringes for<br>single use - Part 1:<br>Syringes for manual use | ISO 7886-1:2017 Sterile<br>hypodermic syringes for<br>single use - Part 1:<br>Syringes for manual use | Same |
| | Sterility | Sterilized by EO Gas<br>SAL=10-6 | Sterilized by EO Gas<br>SAL=10-6 | Same |
| | Endotoxin limit | 20 EU/Device | 20 EU/Device | Same |
| | Labeling | Complies with 21 CFR<br>part 801 | Complies with 21 CFR<br>part 801 | Same |
| | Physical<br>specification | Tip type<br>: Slip Tip<br>Image: Syringe tip | Tip type<br>: Slip Tip<br>Image: Syringe tip | Same |
| | Mechanical<br>specification | Hub/needle bond strength<br>(ISO 7864)<br>1) 23 Gauge: ≥ 34 N<br>2) 25 Gauge: ≥ 22 N | Hub/needle bond strength<br>(ISO 7864)<br>1) 23 Gauge: ≥ 34 N<br>2) 25 Gauge: ≥ 22 N | Same |
### VI. Comparison of technological characteristics with the predicate device
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### Note 1: Needle length
The needle length of proposed device is different from the needle of predicate device. In order to confirm the performance between the different needle specifications, the proposed device was verified by measuring the needle length at each time point of accelerated aging test. The proposed device was found to be substantially equivalent to the predicate device.
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### VII. Performance data
### 1. Biocompatibility Testing
In accordance with ISO 10993-1 the subject device is classified as: Externally Communicating Device, Blood Path Indirect, Limited Contact (<24hours). The following testing was conducted.
- 1) Cytotoxicity
- 2) Sensitization
- 3) Irritation
- 4) Acute Systemic Toxicity
- 5) Material Mediated Pyrogenicity
- 6) Hemolysis
Particulate matter testing was conducted in accordance with USP <788> Particulate Matter in Injection and met the USP acceptance criteria.
### 2. Physical Performance Testing
- (1) ISO 7864:2016-Sterile hypodermic needles for single use requirements and test methods
- (2) ISO 7886-1:2017-Sterile hypodermic syringes for single use Part 1: Syringes for manual use
- (3) ISO 9626:2016-Stainless steel needle tubing for the manufacture of medical devices
### 3. Sterility, Shipping and Shelf-Life
The sterilization method is Ethylene Oxide. EO not detected (Limit of Detection: 0001), ECH- Not detected. (Limit of Detection: 0.02), validation method: Overkill Approach (e.g., Half-Cycle method), pyrogen test: Bacterial endotoxin USP <161>Medical devices -Bacterial Endotoxin and pyrogen test, USP <85> Bacterial endotoxins test.
- Package integrity testing, after environmental conditioning and simulated transportation using ASTM D4169-22, was conducted on final packaged, and sterile devices. All packaging is acceptable for protection of final finished product and sterility maintenance.
- Sterile Barrier Packaging Testing performed on the proposed device:
- Seal peel test ASTM F88/F88 -15 O
- Dye migration- ASTM F1929-15 o
- Shelf life of 3 years is validated using the FDA recognized standard ASTM F1980-21 Standard Guide for Accelerated Aging of Sterile Barrier System for Medical Devices.
### 4. Clinical Studies
Clinical testing was not required to support substantial equivalence.
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## VIII. Conclusion
The differences between the predicate device and the subject device do not raise any new or different questions of safety or effectiveness. The TopFine® LDS (Low Dead Space) Syringe (2 models (TS-LDS2334, TS-LDS2534) is substantially equivalent to the FEELject LDV (low dead volume) syringe with respect to the indications for use, target populations, treatment method, and technological characteristics.
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.