The Guardian Urethral Sheath is intended to facilitate the introduction of catheters or instruments into the urethra. The Guardian Urethral Sheath is indicated for use as a guide for urological catheters or instruments inserted into the urethra and as a lubricious barrier between the urethral tissue and the catheter or instrument.
Device Story
The Guardian Urethral Sheath is a single-use, sterile urological catheter accessory designed to protect the urethra during instrument insertion. It consists of a rigid plastic tube, an obturator, and an everting sleeve that deploys during insertion to reduce friction. The device features a silicone disc for patient comfort, a single-handed fluid management system, and independent fill and waste lines. It accommodates instruments up to 19 French, with a sheath size of 24 French and a length of 4.7 cm. Used by clinicians to facilitate atraumatic passage of catheters or instruments, the sheath acts as a lubricious barrier, reducing urethral abrasion and tenderness for the patient.
Clinical Evidence
Bench testing only. Biocompatibility testing was performed per ISO 10993:2009, including cytotoxicity, sensitization, and irritation/intracutaneous reactivity. In vitro performance testing included simulated use, design verification, and process validation.
Technological Characteristics
Rigid plastic tube, obturator, everting sleeve, and silicone disc. Dimensions: 24 French outer size, 4.7 cm working length. Accommodates instruments up to 19 French. Features single-handed fluid management system and independent fill/waste lines. Supplied sterile, single-use. Biocompatibility per ISO 10993:2009.
Indications for Use
Indicated for use as a guide for urological catheters or instruments inserted into the urethra and as a lubricious barrier between urethral tissue and the catheter or instrument to facilitate atraumatic insertion.
Regulatory Classification
Identification
A urological catheter and accessories is a flexible tubular device that is inserted through the urethra and used to pass fluids to or from the urinary tract. This generic type of device includes radiopaque urological catheters, ureteral catheters, urethral catheters, coudé catheters, balloon retention type catheters, straight catheters, upper urinary tract catheters, double lumen female urethrographic catheters, disposable ureteral catheters, male urethrographic catheters, and urological catheter accessories including ureteral catheter stylets, ureteral catheter adapters, ureteral catheter holders, ureteral catheter stylets, ureteral catheterization trays, and the gastro-urological irrigation tray (for urological use).
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## 510(K) SUMMARY
The 510(k) Summary is submitted in accordance with 21 CFR 807.92 and the requirements of the Safe Medical Device ACT (SMDA) of 1990.
- l. Sponsor Name Submitter's Name: Solace Therapeutics Address: 135 Newbury St, Framingham, MA 01701 Phone: (508) 283-1200 Contact Person: William Gruber Date of Preparation: May 30, 2013
- 2. Device Information Trade Name: Guardian Urethral Sheath Common Name: Urological catheter Class: Il Classification Name: Urological catheter (21 CFR 876.5130, Product Code KNY)
**AUG 20 2013**
- 3. Predicate Devices Guardian Urethral Sheath K052298 (formerly CYSTOGLIDE INTRODUCER SHEATH)
- 4. Device Description
The Solace Guardian Urethral Sheath is an everting sleeve sheath with a backflow valve for the establishment of a protective tract to the bladder to facilitate atraumatic insertion of catheters and instruments through the urethra. The sheath consists of a thin-walled rigid plastic tube, an obturator, and an everting sleeve that deploys from the obturator during insertion to reduce friction. Improvements from the Generation I sheath include a silicone disc to improve patient comfort at the external contact point, a single handed fluid management system, and independent fill and waste lines.
The Urethral Sheath is supplied sterile and is single use. The working channel is sized to accommodate instruments up to 19 French. The sheath outside size is 24 French with a working length of 4.7 cm.
The Sheath helps the patient by protecting the urethra and reducing abrasion or tenderness resulting from instruments passing through the urethra.
- 5. Intended Use
The Guardian Urethral Sheath is intended to facilitate the introduction of catheters or instruments into the urethra. The Guardian Urethral Sheath is indicated for use as a guide for urological catheters or instruments inserted into the urethra and as a lubricious barrier between the urethral tissue and the catheter or instrument.
- 6. Comparison of Technological Characteristics
{1}------------------------------------------------
The Generation 2 Guardian Urethral Sheath is substantially equivalent in material, design and function to the Generation 1 Guardian Urethral Sheath K052298 (formerly CYSTOGLIDE INTRODUCER SHEATH)
Improvements from the Generation 1 sheath include a silicone disc to improve patient comfort at the external contact point, a single handed fluid management system, and independent fill and waste lines.
- 7. Performance Data
Biocompatibility Testing
Biocompatibility tests were conducted on the Guardian Urethral Sheath according to the requirements of ISO 10993:2009. The following were completed:
- Cytotoxicity .
- . Sensitization
- . Irritation or Intracutaneous reactivity
In Vitro Performance Testing
In vitro performance tests were performed on the Guardian Urethral Sheath. The following were performed:
- Simulated Use Testing .
- Design Verification Testing .
- Process Validation Testing .
## Conclusion
Based upon these biocompatibility and in vitro performance tests, the Guardian Urethral Sheath has been shown to be substantially equivalent to the currently marketed Guardian Urethral Sheath K052298.
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Public Health Service
Food and Drug Administration 10903 New Hampshire Avenue Document Control Center - WO66-G6(19 Silver Spring, MD 20993-0002
August 20, 2013
Solace Therapeutics % William Gruber President 135 Newbury Street Framingham, MA 01701
Re: K131803
Trade/Device Name: Guardian Urethral Sheath Regulation Number: 21 CFR\$ 876.5130 Regulation Name: Urological catheter and accessories Regulatory Class: II Product Code: KNY Dated: July 23, 2013 Received: July 24, 2013
Dear William Gruber,
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. 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 (sec 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.
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Page 2 - William Gruber
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 803); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820); and if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.
If you desire specific advice for your device on our labeling regulation (21 CFR Part 801), please go to http://www.fda.gov/AboutFDA/CentersOffices/CDRH/CDRHOffices/ucm115809.htm for the Center for Devices and Radiological Health's (CDRH's) Office of Compliance. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21CFR 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/MedicalDevices/ResourcesforYou/Industry/default.htm.
Sincerely yours,
## Herbert P. Lerner -S
for
Benjamin R. Fisher, Ph.D. Director Division of Reproductive, Gastro-Renal, and Urological Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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K131803 510(k) Number (if known):
Guardian Urethral Sheath Device Name:
Indications For Use:
The Guardian Urethral Sheath is intended to facilitate the introduction of catheters or instruments into the urethra. The Guardian Urethral Sheath is indicated for use as a guide for urological catheters or instruments inserted into the urethra and as a lubricious barrier between the urethral tissue and the catheter or instrument.
Prescription Use X (Per 21 CFR 801.109 Subpart D) AND/OR
Over-The-Counter Use (21 CFR 801 Subpart C)
(PLEASE DO NOT WRITE BELOW THIS LINE. CONTINUE ON ANOTHER PAGE IF NEEDED)
Concurrence of CDRH, Office of Device Evaluation (ODE)
ﺴﺴ
## Herbert P. Lerner -S
Page _1_ of _1_
(Division Sign-Off) Division of Reproductive, Gastro-Renal, and Urological Devices K131803 510(k) Number _
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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.
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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.
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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.
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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.
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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.