Medisystems Transducer Protectors are single use, disposable prescription devices intended for use as protective devices for pressure monitors and to help protect the sterility of the fluid pathwav.
Device Story
Medisystems Transducer Protectors are single-use, disposable devices used in hemodialysis settings. The device consists of a filter housing containing a 0.2 um hydrophobic filter. It is placed in the blood tubing fluid pathway to protect pressure monitors. The hydrophobic filter acts as a barrier, preventing the passage of fluids, viruses, bacteria, and particulate matter into the pressure transducer while allowing air pressure transmission. This protects the hemodialysis machine's pressure monitoring system from contamination and fluid ingress, maintaining the sterility of the fluid pathway. The device is operated by clinical staff during hemodialysis procedures.
Clinical Evidence
Bench testing only. Testing included sterility, pyrogenicity, physical testing, and visual examination of in-process and finished products to ensure compliance with design specifications.
Technological Characteristics
Filter housing containing a 0.2 um hydrophobic filter. The device is a single-use, disposable component designed for hemodialysis pressure monitoring lines. It functions by utilizing the pore size and hydrophobic properties of the filter to block fluids, viruses, bacteria, and particulates at pressures below the device's rated limit.
Indications for Use
Indicated for use as protective devices for pressure monitors on hemodialysis machines and to maintain sterility of the blood tubing fluid pathway by preventing cross-contamination from viruses, bacteria, and particulate matter, and preventing fluid flow to the pressure transducer.
Regulatory Classification
Identification
A hemodialysis system and accessories is a device that is used as an artificial kidney system for the treatment of patients with renal failure or toxemic conditions and that consists of an extracorporeal blood system, a conventional dialyzer, a dialysate delivery system, and accessories. Blood from a patient flows through the tubing of the extracorporeal blood system and accessories to the blood compartment of the dialyzer, then returns through further tubing of the extracorporeal blood system to the patient. The dialyzer has two compartments that are separated by a semipermeable membrane. While the blood is in the blood compartment, undesirable substances in the blood pass through the semipermeable membrane into the dialysate in the dialysate compartment. The dialysate delivery system controls and monitors the dialysate circulating through the dialysate compartment of the dialyzer.(1) The extracorporeal blood system and accessories consists of tubing, pumps, pressure monitors, air foam or bubble detectors, and alarms to keep blood moving safely from the blood access device and accessories for hemodialysis (§ 876.5540) to the blood compartment of the dialyzer and back to the patient. (2) The conventional dialyzer allows a transfer of water and solutes between the blood and the dialysate through the semipermeable membrane. The semipermeable membrane of the conventional dialyzer has a sufficiently low permeability to water that an ultrafiltration controller is not required to prevent excessive loss of water from the patient's blood. This conventional dialyzer does not include hemodialyzers with the disposable inserts (Kiil type) (§ 876.5830) or dialyzers of high permeability (§ 876.5860). (3) The dialysate delivery system consists of mechanisms that monitor and control the temperature, conductivity, flow rate, and pressure of the dialysate and circulates dialysate through the dialysate compartment of the dialyzer. The dialysate delivery system includes the dialysate concentrate for hemodialysis (liquid or powder) and alarms to indicate abnormal dialysate conditions. This dialysate delivery system does not include the sorbent regenerated dialysate delivery system for hemodialysis (§ 876.5600), the dialysate delivery system of the peritoneal dialysis system and accessories (§ 876.5630), or the controlled dialysate delivery system of the high permeability hemodialysis system § 876.5860). (4) Remote accessories to the hemodialysis system include the unpowered dialysis chair without a scale, the powered dialysis chair without a scale, the dialyzer holder set, dialysis tie gun and ties, and hemodialysis start/stop tray.
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K983076
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## Section I
## 510(k) Summary Required by 21 CFR §807.92
I. Submitter:
McKenna & Cuneo, L.L.P. A. Name:
B. Address: 1900 K Street, NW Washington, DC 20006
C. Phone and Fax Numbers: Phone: 202-496-7500 Fax 202-496-7756
D. Contact Person: Mr. Larry Pilot
II. Date of preparation of this Summary: August 13, 1998
III. Trade Name: Medisystems Transducer Protectors
IV. Common Name: Transducer Protectors
V. Classification Name: Hemodialysis System and Accessories
VI. The Marketed Device(s) to which Equivalence is Claimed: The Transducer Protectors that are the subject of this submission are substantially equivalent to those described in Medisystems 510(k) number K895856 for the design and construction of the device and to those described in the Trimed 510(k) number K820459B for the claim of viral retention.
VII. Product Description: Medisystems Transducer Protectors are designed to be used as protective devices for pressure monitors as well as to help maintain the sterility of the blood tubing fluid pathway. The 0.2 um hydrophobic filter helps prevent cross-contamination by viruses, bacteria and particulate matter while preventing the flow of fluids to the hemodialysis machine pressure monitor.
VIII. Statement of Intended Use Compared to Predicate Device: Medisystems Transducer Protectors are single use, disposable prescription devices intended for use as protective devices for pressure monitors and to help protect the sterility of the fluid pathwav. This is identical to the intended use of the legally marketed predicate device.
IX. Discussion of Technological Characteristics: The technical characteristics of the device consist of a filter housing that contains a 0.2 um hydrophobic filter. The combination of the pore
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size and hydrophobic nature of the filter also prevents the flow of fluids, viruses, bacteria, and particulate matter into the pressure monitor at pressures lower than the rated pressure of the device.
X. Safety and Effectiveness: To assure that the device is safe and effective, all finished products are tested and must meet all required release specifications before distribution. The testing required for release includes, but is not limited to; sterility, pyrogenicity, physical testing, and visual examination of both in-process and finished product.
The required testing is defined by written and approved procedures that conform to the product design specifications. This testing for the Medisystems Transducer Protectors is defined in detail in the "Device Master Records."
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Image /page/2/Picture/2 description: The image shows a circular logo for the Department of Health & Human Services. The logo features a stylized representation of three human figures connected at the shoulders, forming a triangular shape. The figures are silhouetted in black. The text "DEPARTMENT OF HEALTH & HUMAN SERVICES" is arranged around the upper portion of the circle.
Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850
NOV 25 1998
Medisystems Corp. c/o Mr. Larry R. Pilot McKenna & Cuneo, L.L.P. 1900 K Street, N.W. Washington, D.C. 20006-1108 Re: K983076
Medisystem's In Line Transducer Protector Dated: September 2, 1998 Received: September 2, 1998 Regulatory Class: II 21 CFR 876.5820/Procode: 78 FIB
Dear Mr. Pilot:
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 requirements, as set forth in the Quality System Regulation (OS) 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 542 of the Act for devices under the Electronic Product Radiation Control provisions, or other Federal laws or regulations.
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) 594-4613. 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/cdrl/dsmaldsmamain.html".
Sincerely yours
Lillian Yin, Ph.D.
Director, Division of Reproducti Abdominal, Ear, Nose and Thro and Radiological Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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## Section A
510(k) Number (if known): __
Device Name: Transducer Protectors
Indications For Use:
Medisystems Transducer Protectors are indicated for use as protective devices for pressure monitors on hemodialysis machines as well as to help protect the sterility of the blood tubing fluid pathway. The filter helps prevent cross-contamination by viruses, bacteria, and other particulate matter while preventing the flow of fluids to the hemodialysis machine's pressure transducer.
(PLEASE DO NOT WRITE BELOW THIS LINE - CONTINUE ON ANOTHER PAGE IF NEEDED)
Concurrence of CDRH, Office of Device Evaluation (ODE)
Vimil A. Seryman
Division Sign Off
(Division Sign-Off) Division of Reproductive, Abdominal, EN and Radiological De
Prescription Use レ 510(k) Number Over-The-Counter Use
(Optional Format 1-2-96)
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.
